We gratefully acknowledge Dr. Deborah L. Gumucio as our advisor and for her invaluable support in defining the culture and imaging methods. We also thank Dr. Jim Brodie, Dr. Hong-Xiang Lu, Dr. Charlotte Mistretta, and Dr. Ann Grosse for their contributions to the development of the whole intestine organ culture system. Helpful discussions on imaging provided excellent advice from Dr. Chip Montrose, Michael Czerwinski and Sasha Meshinchi. All imaging was performed in the Microscopy and Image Analysis Laboratory at the University of Michigan. Funding support was provided by NIH R01 DK065850.

NOTE: All mice were handled humanely using protocols approved by the University of Michigan Medical School Unit for Laboratory Animal Medicine and according to the guidelines of the University Committee on Use and Care of Animals.
1. Whole Organ Culture System
<ol>
	<li>Preparation of media and culture plates
	<ol>
		<li>In a tissue culture hood, remove 5 ml of BGJb media from the stock bottle and add 5 ml of Pen/Strep. Prepare a working stock of media in a 50 ml conical tube, by adding 1 ml...

<ol>
	<li>Grosse, A. S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell+dynamics+in+fetal+intestinal+epithelium:+implications+for+intestinal+growth+and+morphogenesis.">Cell dynamics in fetal intestinal epithelium: implications for intestinal growth and morphogenesis.</a> Development. 138, 4423-4432 (2011).</li><li>Walton, K. D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hedgehog-responsive+mesenchymal+clusters+direct+patterning+and+emergence+of+intestinal+villi.">Hedgehog-responsive mesenchymal clusters direct patterning and emergence of intestinal villi.</a> Proc Natl Acad Sci U S A. 109, 15817-15822 (2012).</li><li>Wells, J. M., Melton, D. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Vertebrate+endoderm+development.">Vertebrate endoderm development.</a> Annu Rev Cell Dev Biol. 15, 393-410 (1999).</li><li>Hashimoto, H., Ishikawa, H., Kusakabe, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Development+of+vascular+networks+during+the+morphogenesis+of+intestinal+villi+in+the+fetal+mouse.">Development of vascular networks during the morphogenesis of intestinal villi in the fetal mouse.</a> Kaibogaku zasshi Journal of anatomy. 74, 567-576 (1999).</li><li>Mathan, M., Moxey, P. C., Trier, J. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Morphogenesis+of+fetal+rat+duodenal+villi.">Morphogenesis of fetal rat duodenal villi.</a> Am J Anat. 146, 73-92 (1976).</li><li>Burns, R. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Requirement+for+fibroblast+growth+factor+10+or+fibroblast+growth+factor+receptor+2-IIIb+signaling+for+cecal+development+in+mouse.">Requirement for fibroblast growth factor 10 or fibroblast growth factor receptor 2-IIIb signaling for cecal development in mouse.</a> Dev Biol. 265, 61-74 (2004).</li><li>Pabst, O., Schneider, A., Brand, T., Arnold, H. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mouse+Nkx2-3+homeodomain+gene+is+expressed+in+gut+mesenchyme+during+pre-+and+postnatal+mouse+development.">The mouse Nkx2-3 homeodomain gene is expressed in gut mesenchyme during pre- and postnatal mouse development.</a> Dev Dyn. 209, 29-35 (1997).</li><li>Pabst, O., Zweigerdt, R., Arnold, H. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeted+disruption+of+the+homeobox+transcription+factor+Nkx2-3+in+mice+results+in+postnatal+lethality+and+abnormal+development+of+small+intestine.">Targeted disruption of the homeobox transcription factor Nkx2-3 in mice results in postnatal lethality and abnormal development of small intestine.</a> Development. 126, 2215-2225 (1999).</li><li>Kaestner, K. H., Silberg, D. G., Traber, P. G., Sch&#252;tz, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+mesenchymal+winged+helix+transcription+factor+Fkh6+is+required+for+the+control+of+gastrointestinal+proliferation+and+differentiation.">The mesenchymal winged helix transcription factor Fkh6 is required for the control of gastrointestinal proliferation and differentiation.</a> Genes &amp; Development. 11, 1583-1595 (1997).</li><li>Madison, B. B., McKenna, L. B., Dolson, D., Epstein, D. J., Kaestner, K. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=FoxF1+and+FoxL1+link+hedgehog+signaling+and+the+control+of+epithelial+proliferation+in+the+developing+stomach+and+intestine.">FoxF1 and FoxL1 link hedgehog signaling and the control of epithelial proliferation in the developing stomach and intestine.</a> J Biol Chem. 284, 5936-5944 (2009).</li><li>Karlsson, L., Lindahl, P., Heath, J. K., Betsholtz, C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Abnormal+gastrointestinal+development+in+PDGF-A+and+PDGFR-(alpha)+deficient+mice+implicates+a+novel+mesenchymal+structure+with+putative+instructive+properties+in+villus+morphogenesis.">Abnormal gastrointestinal development in PDGF-A and PDGFR-(alpha) deficient mice implicates a novel mesenchymal structure with putative instructive properties in villus morphogenesis.</a> Development. 127, 3457-3466 (2000).</li><li>Mao, J., Kim, B., Rajurkar, M., Shivdasani, R., Mcmahon, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hedgehog+signaling+controls+mesenchymal+growth+in+the+developing+mammalian+digestive+tract.">Hedgehog signaling controls mesenchymal growth in the developing mammalian digestive tract.</a> Development. 137, 1721-1729 (2010).</li><li>Theiler, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> The house mouse. Development and normal stages from fertilization to 4 weeks of age. , (1989).</li><li>Hamilton, T. G., Klinghoffer, R. A., Corrin, P. D., Soriano, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Evolutionary+divergence+of+platelet-derived+growth+factor+alpha+receptor+signaling+mechanisms.">Evolutionary divergence of platelet-derived growth factor alpha receptor signaling mechanisms.</a> Mol Cell Biol. 23, 4013-4025 (2003).</li><li>Muzumdar, M. D., Tasic, B., Miyamichi, K., Li, L., Luo, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+global+double-fluorescent+Cre+reporter+mouse.">A global double-fluorescent Cre reporter mouse.</a> Genesis. 45, 593-605 (2007).</li><li>Goodrich, L. V., Milenkovic, L., Higgins, K. M., Scott, M. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Altered+neural+cell+fates+and+medulloblastoma+in+mouse+patched+mutants.">Altered neural cell fates and medulloblastoma in mouse patched mutants.</a> Science. 277, 1109-1113 (1997).</li><li>Fu, Y. Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microtome-free+3-dimensional+confocal+imaging+method+for+visualization+of+mouse+intestine+with+subcellular-level+resolution.">Microtome-free 3-dimensional confocal imaging method for visualization of mouse intestine with subcellular-level resolution.</a> Gastroenterology. 137, 453-465 (2009).</li></ol>

The dynamic nature and complex tissue interactions of the developing intestine requires 3D visualization to have a full appreciation of these morphogenetic events. With evolving imaging technology, the ability to examine villus morphogenesis in detail is developing/improving and with it, the understanding of the spatial communication and interaction during organogenesis is greatly enhanced.
Alternative methods for culturing whole intestines have also been tested, but the transwell system remai...

Each intestinal villus is composed of two main tissue compartments: an epithelial surface layer and a mesenchymal core. The mouse small intestine is formed at embryonic day 10 when a sheet of endoderm closes and seals to form a tube of epithelium surrounded by mesenchymal cells3. This flat tube of epithelium undergoes rapid proliferation, growing both in length and girth and undergoes dramatic rearrangements involving dynamic cell shape changes1. At the same time, the surrounding mesenchyme also undergoes many developmental processes including the formation of the vascular plexus, differentiation of smooth muscle and recruitment of enteric neurons4. In the proximal small intestine at embryonic day 14.5, condensations (clusters) of Hedgehog- and PDGF-responsive cells begin to form adjacent to the epithelium2,5. Formation of mesenchymal clusters continues to spread along the length of the intestine so that they cover the entirety of the small intestine by embryonic day 16.52. As mesenchymal clusters form, the epithelial cells closest to the clusters begin to withdraw from the cell cycle, while the other epithelial cells continue to proliferate. Those cells directly above the mesenchymal cluster that have withdrawn from the cell cycle begin to change shape as the emerging villus buckles into the lumen. Further growth of the villus is driven in part by the continued proliferation of the epithelium between the emerging villi. The mesenchymal clusters remain tightly adhered to the epithelium of the growing villus and continue to express a variety of signaling molecules. The wave of villus emergence propagates along the length of the small intestine following the formation of mesenchymal clusters. As the intestine continues to grow and the intervillus region extends between emerging villi, new mesenchymal clusters form adjacent to the intervillus epithelium and further rounds of villus emergence and growth ensue6.
Synchronized development of the epithelium and mesenchyme is essential for villus morphogenesis. Signaling molecules are secreted from one layer to the other where receptors receive and transduce the signal message in order to coordinate development between the epithelium and mesenchyme. Mesenchymal clusters act as signaling centers and express a variety of developmental morphogens7-10. Disruption of cluster formation or pattern results in loss of villus emergence and pattern. Inhibition of PDGF signaling results in fewer clusters and fewer villi and those villi that do form are misshapen following the abnormal clusters11. Loss of Hedgehog signaling results in complete loss of cluster formation and failure of villus emergence2,12. Together, these data demonstrate that clusters coordinate development of the villus epithelium with its mesenchymal core.
Using this whole organ culture system, we are able to alter signaling involved in epithelial-mesenchymal cluster cross-talk to determine the role of those signals in villus morphogenesis. Two-photon confocal optical sectioning and reconstruction afford the ability to visualize cluster formation and villus emergence in three-dimensions and better understand the spatial relationships between the mesenchymal clusters and their overlying epithelium. Extending the culture system to four dimensions, we can capture z-stacks of developing clusters and villi over time and observe these interactions. Ultimately, the ability to follow villus development in this manner and observe changes that occur with altered signaling will revolutionize the understanding of epithelial mesenchymal interactions in villus morphogenesis.

<table border="0" cellpadding="0" cellspacing="0" width="1308">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:508px;">Fine dissecting forceps&#160;</td>
			<td style="width:223px;">Fine Science Tools</td>
			<td style="width:133px;">&#160;11254-20</td>
			<td style="width:444px;">2 pairs</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">70% Ethanol</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">1x sterile Dulbecco&#39;s Phosphate-Buffered Saline (DPBS)</td>
			<td>Gibco&#160;</td>
			<td>14040-133</td>
			<td style="width:444px;">500 ml</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">6 well plates</td>
			<td>Costar</td>
			<td>3516</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">24 well plates</td>
			<td>Costar&#160;</td>
			<td>3524</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">60 x 15 mm petri dishes</td>
			<td>Falcon</td>
			<td>&#160;451007</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Transwell plates, 24 mm inserts, 8.0 mm polycarbonate membranes</td>
			<td>Corning Costar&#160;</td>
			<td>3428</td>
			<td style="width:444px;">6 inserts per plate</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">BGJb media</td>
			<td>Invitrogen&#160;</td>
			<td>12591-038</td>
			<td style="width:444px;">500 ml</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">PenStrep (10,000U/ml Penicillin; 10,000 mg/ml Streptomycin)</td>
			<td>Gibco</td>
			<td>&#160;15140</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Ascorbic Acid</td>
			<td>Sigma&#160;</td>
			<td>A0278</td>
			<td style="width:444px;">make 5 mg/ml stock, filter, aliquot and store at -20 &#176;C</td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;">Mouth pipet (Drummond 1-15 inch aspirator tube assembly)</td>
			<td>Fisher</td>
			<td style="width:133px;">&#160;21-180-10</td>
			<td style="width:444px;">remove the aspirator assembly and replace it with a 1000 &#181;l pipet tip which acts as an adaptor to plug in a 6 inch glass Pasteur pipet.</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">6 inch glass pasteur pipets</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Agarose beads</td>
			<td>BioRad&#160;</td>
			<td>153-7301</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Capillary Tubes</td>
			<td>World Precision Instruments&#160;</td>
			<td>TW100F-4</td>
			<td style="width:444px;">pull to needles</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;">4% Paraformaldehyde</td>
			<td></td>
			<td></td>
			<td style="width:444px;">made in 1 x PBS, pH to 7.3</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;"></td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;"></td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Live Imaging Materials</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Name of Material/Equipment</td>
			<td>Company</td>
			<td>Catalog Number</td>
			<td style="width:444px;">Comments/Description</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Culture plates</td>
			<td>Falcon&#160;</td>
			<td>353037</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Fine mesh stainless steel screen</td>
			<td>purchase at hardware store</td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">Polycarbonate membranes</td>
			<td>Thomas scientific&#160;</td>
			<td>4663H25</td>
			<td style="width:444px;">alternatively, cut Corning Costar 3428 membranes off of transwell supports</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">Instant glue</td>
			<td>purchase at hardware store</td>
			<td style="width:133px;">gel based preferrably</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">35 x 10 mm plates</td>
			<td>Falcon&#160;</td>
			<td style="width:133px;">351008</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">7% agarose</td>
			<td>Sigma</td>
			<td>&#160;A9414</td>
			<td style="width:444px;">prepare w/v in 1x DPBS, heating to dissolve in a waterbath</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">minutien pins</td>
			<td>Fine Science Tools&#160;</td>
			<td style="width:133px;">26002-20</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Phenol red free media (DMEM)</td>
			<td>Gibco&#160;</td>
			<td style="width:133px;">21063-029</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Xylazine (100 mg/ml)</td>
			<td>AnaSed&#160;</td>
			<td style="width:133px;">139-236</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">Matrigel</td>
			<td>BD</td>
			<td style="width:133px;">356231</td>
			<td style="width:444px;">basement membrane matrix, growth factor reduced, phenol red-free</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;">3-4% agarose</td>
			<td>Sigma&#160;</td>
			<td>A9414</td>
			<td style="width:444px;">prepare w/v in 1x DPBS, heating to dissolve in a waterbath</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;"></td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Imaging of fixed intestines</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Name of Material/Equipment</td>
			<td>Company</td>
			<td>Catalog Number</td>
			<td style="width:444px;">Comments/Description</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">vaseline</td>
			<td style="width:223px;">purchase at pharmacy</td>
			<td></td>
			<td>used to make VALAP: equal parts vaseline, lanolin, paraffin</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">lanolin</td>
			<td style="width:223px;">Sigma&#160;</td>
			<td>L7387</td>
			<td>used to make VALAP: equal parts vaseline, lanolin, paraffin</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">paraffin</td>
			<td style="width:223px;">Surgipath</td>
			<td>39601006</td>
			<td>used to make VALAP: equal parts vaseline, lanolin, paraffin</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">70% glycerol in 1 x PBS</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Focus clear and Mount Clear</td>
			<td>CelExplorer Labs Co.</td>
			<td>&#160;F101-KIT</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Modeling clay</td>
			<td>purchase at art supply store</td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">double stick tape</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">cotton applicator swabs</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">plastic molds, 10mm x 10mm x 5 mm)</td>
			<td>Tissue Tek&#160;</td>
			<td>4565</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">slides</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">coverslips</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">lab wipe</td>
			<td>Kimberly Clark</td>
			<td>34155</td>
			<td style="width:444px;">lint free delicate task wipe</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">Theiler staging chart&#160;</td>
			<td></td>
			<td></td>
			<td style="width:444px;"><a href="http://www.emouseatlas.org/emap/ema/theiler_stages/%20downloads/theiler2.pdf">http://www.emouseatlas.org/emap/ema/theiler_stages/ downloads/theiler2.pdf</a></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Leica SP5X confocal microscope&#160;</td>
			<td>Leica</td>
			<td></td>
			<td style="width:444px;">Used to conduct the live imaging&#160;</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Leica DMI 6000 stand&#160;</td>
			<td>Leica</td>
			<td></td>
			<td style="width:444px;">Used to conduct the live imaging&#160;</td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;">Aqueous mounting medium (Prolong Gold)</td>
			<td>Molecular Probes&#160;</td>
			<td>P36930</td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="22">
			<td height="22" style="height:22px;"></td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Materials for Immunofluorescence staining of fixed, vibratome sectioned intestines</td>
			<td></td>
			<td></td>
			<td style="width:444px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Name of Material/Equipment</td>
			<td>Company</td>
			<td>Catalog Number</td>
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			<td style="width:444px;">used to make Permeabilization solution: 0.5% Triton X-100 in 1 x PBS</td>
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			<td style="width:444px;">used to make Blocking Solution: 4% Goat serum, 0.1% Tween20 in 1x PBS</td>
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			<td height="22" style="height:22px;">Tween20&#160;</td>
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mouse fetal whole intestine culture system for ex vivo manipulation of signaling pathways and three-dimensional live imaging of villus development

Most morphogenetic processes in the fetal intestine have been inferred from thin sections of fixed tissues, providing snapshots of changes over developmental stages. Three-dimensional information from thin serial sections can be challenging to interpret because of the difficulty of reconstructing serial sections perfectly and maintaining proper orientation of the tissue over serial sections. Recent findings by Grosse et al., 2011 highlight the importance of three- dimensional information in understanding morphogenesis of the developing villi of the intestine1. Three-dimensional reconstruction of singly labeled intestinal cells demonstrated that the majority of the intestinal epithelial cells contact both the apical and basal surfaces. Furthermore, three-dimensional reconstruction of the actin cytoskeleton at the apical surface of the epithelium demonstrated that the intestinal lumen is continuous and that secondary lumens are an artifact of sectioning. Those two points, along with the demonstration of interkinetic nuclear migration in the intestinal epithelium, defined the developing intestinal epithelium as a pseudostratified epithelium and not stratified as previously thought1. The ability to observe the epithelium three-dimensionally was seminal to demonstrating this point and redefining epithelial morphogenesis in the fetal intestine. With the evolution of multi-photon imaging technology and three-dimensional reconstruction software, the ability to visualize intact, developing organs is rapidly improving. Two-photon excitation allows less damaging penetration deeper into tissues with high resolution. Two-photon imaging and 3D reconstruction of the whole fetal mouse intestines in Walton et al., 2012 helped to define the pattern of villus outgrowth2. Here we describe a whole organ culture system that allows ex vivo development of villi and extensions of that culture system to allow the intestines to be three-dimensionally imaged during their development.

Culture of whole explants of fetal intestines allows for the analyses of the location, distribution, and duration of the signaling molecules that coordinate intestinal development, as this system enables the manipulation of the signaling with pharmacological reagents or recombinant proteins. The transwell culture system (Figure 1A, reproduced from Walton et al., 2012)2 provides an air-liquid interface, which makes it possible to place drug- or protein soaked agarose beads onto the tis...

Watch this Scientific Journal Video about Mouse Fetal Whole Intestine Culture System for Ex Vivo Manipulation of Signaling Pathways and Three-dimensional Live Imaging of Villus Development at JoVE.com

Mouse Fetal Whole Intestine Culture System for Ex Vivo Manipulation of Signaling Pathways and Three-dimensional Live Imaging of Villus Development

Improved imaging technology is allowing three-dimensional imaging of organs during development. Here we describe a whole organ culture system that allows live imaging of the developing villi in the fetal mouse intestine.

Mouse Fetal Whole Intestine Culture System for Ex Vivo Manipulation of Signaling Pathways and Three-dimensional Live Imaging of Villus Development

Most morphogenetic processes in the fetal intestine have been inferred from thin sections of fixed tissues, providing snapshots of changes over ...

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14.7K 次观看.  University of Michigan. Improved imaging technology is allowing three-dimensional imaging of organs during development. Here we describe a whole organ culture system that allows live imaging of the developing villi in the fetal mouse intestine. 

视频: Mouse Fetal Whole Intestine Culture System for Ex Vivo Manipulation of Signaling Pathways and Three-dimensional Live Imaging of Villus Development

Improved imaging technology is allowing three-dimensional imaging of organs during development. Here we describe a whole organ culture system that allows live imaging of the developing villi in the fetal mouse intestine.

using ex vivo upright droplet cultures of whole fetal organs to study developmental processes during mouse organogenesis

Using Ex Vivo Upright Droplet Cultures of Whole Fetal Organs to Study Developmental Processes during Mouse Organogenesis

The&#160;ex vivo&#160;upright droplet culture is an alternative to current&#160;in vitro&#160;and&#160;in vivo&#160;experimental techniques. This protocol is easy to perform and requires smaller amounts of reagent, while permitting the ability to manipulate and study fetal vascularization, morphogenesis, and...

Using Ex Vivo Upright Droplet Cultures of Whole Fetal Organs to Study Developmental Processes during Mouse Organogenesis

ex vivo culture of mouse embryonic skin and live-imaging of melanoblast migration

Ex vivo Culture of Mouse Embryonic Skin and Live-imaging of Melanoblast Migration

We describe the dissection and ex vivo culture of mouse embryonic skin. The culture system maintains an air-liquid interface across the tissue surface and allows imaging on an inverted microscope. Melanoblasts, a component of the developing skin, are fluorescently labeled allowing their behavior to be observed using confocal...

Ex vivo Culture of Mouse Embryonic Skin and Live-imaging of Melanoblast Migration

an ex vivo culture system to study thyroid development

An Ex vivo Culture System to Study Thyroid Development

This protocol describes dissection of mouse embryonic thyroid anlagen and the culture of explants on semiporous filters or on microscopy plastic slides. This system is ideal to study morphogenetic or differentiation events occurring during thyroid development of wild type or knockout embryos, and is amenable to gain- and loss-of-function...

An Ex vivo Culture System to Study Thyroid Development

three-dimensional imaging of organoids to study primary ciliogenesis during ex vivo organogenesis

Three-Dimensional Imaging of Organoids to Study Primary Ciliogenesis During ex vivo Organogenesis

Stem cell-derived organoids facilitate the analysis of molecular and cellular processes that regulate stem cell self-renewal and differentiation during organogenesis in mammalian tissues. Here we present a protocol for the analysis of the biology of the primary cilium in mouse mammary organoids.

Three-Dimensional Imaging of Organoids to Study Primary Ciliogenesis During ex vivo Organogenesis

three-dimensional culture of murine colonic crypts to study intestinal stem cell function ex vivo

Three-Dimensional Culture of Murine Colonic Crypts to Study Intestinal Stem Cell Function Ex Vivo

The present protocol describes establishing a murine colonic organoid system to study the activity and functioning of colonic stem cells in a claudin-7 knockout...

Three-Dimensional Culture of Murine Colonic Crypts to Study Intestinal Stem Cell Function Ex Vivo

in vivo whole-brain imaging of zebrafish larvae using three-dimensional fluorescence microscopy

Author Spotlight: In Vivo Whole-Brain Imaging of Zebrafish Larvae Using Three-Dimensional Fluorescence Microscopy  

Presented here is a protocol for in vivo whole-brain imaging of larval zebrafish using three-dimensional fluorescence microscopy. The experimental procedure includes sample preparation, image acquisition, and...

In Vivo Whole-Brain Imaging of Zebrafish Larvae Using Three-Dimensional Fluorescence Microscopy

maintaining human glioblastoma cellular diversity ex vivo using three-dimensional organoid culture

Maintaining Human Glioblastoma Cellular Diversity Ex vivo using Three-Dimensional Organoid Culture

Here, we describe a method of generating glioblastoma (GBM) organoids from primary patient specimens or patient-derived cell cultures and maintaining them to maturity. These GBM organoids contain phenotypically diverse cell populations and recreate tumor microenvironments ex...

Maintaining Human Glioblastoma Cellular Diversity Ex vivo using Three-Dimensional Organoid Culture

mouse embryonic development in a serum-free whole embryo culture system

Mouse Embryonic Development in a Serum-free Whole Embryo Culture System

Serum utilized in embryo cultures contains unknown components that can affect the outcome of experiments especially in studies involving signaling interactions. Here we utilized a serum-free oxygenated culture system and show that mid-gestation mouse embryos cultured for 16-40 hr&#160;exhibit morphological development comparable to embryos developing in...

ex vivo live imaging of single cell divisions in mouse neuroepithelium

Ex vivo Live Imaging of Single Cell Divisions in Mouse Neuroepithelium

Here we develop the tools necessary for ex vivo live imaging to trace single cell divisions in the mouse E8.5...

Ex vivo Live Imaging of Single Cell Divisions in Mouse Neuroepithelium

whole lung agarose inflation: a method of preparing  lungs for ex vivo live imaging

This video describes a method of preparing lungs for ex vivo live imaging to study interactions between cancer cells and stromal cells, using agarose for inflation. In the sample protocol, agarose inflation procedure is described before observing live cellular...

Whole Lung Agarose Inflation: A Method of Preparing  Lungs for Ex vivo Live Imaging

ex vivo culture and imaging of oculomotor slices from transgenic mouse embryos

This video demonstrates the ex vivo culture and imaging of oculomotor slices from transgenic mouse embryos. The embryos are isolated and embedded in agarose. Using a vibratome, slices containing the oculomotor nuclei and eyes are obtained. The slices are maintained in culture and imaged using a fluorescence...

Ex Vivo Culture and Imaging of Oculomotor Slices from Transgenic Mouse Embryos

using ex vivo live imaging to investigate cell divisions and movements during mouse dental renewal

Author Spotlight: Understanding Dynamic Cellular Behaviors in Adult Mouse Dental Tissue Renewal and Repairment 

Ex vivo live imaging is a powerful technique for studying the dynamic processes of cellular movements and interactions in living tissues. Here, we present a protocol that implements two-photon microscopy to live track dental epithelial cells in cultured whole adult mouse...

Using Ex Vivo Live Imaging to Investigate Cell Divisions and Movements During Mouse Dental Renewal

ex vivo live imaging of lung metastasis and their microenvironment

Ex vivo Live Imaging of Lung Metastasis and Their Microenvironment

We describe a relatively simple method for ex vivo live imaging of the tumor cell-stroma interactions within lung metastasis, utilizing fluorescent reporters in mice. Using spinning-disk confocal microscopy, this technique enables visualization of live cells for at least 4 hr and could be adapted to study other inflammatory lung...

Ex vivo Live Imaging of Lung Metastasis and Their Microenvironment

three-dimensional, serum-free culture system for lacrimal gland stem cells

Three-Dimensional, Serum-Free Culture System for Lacrimal Gland Stem Cells

The three-dimensional, serum-free culture method for adult lacrimal gland (LG) stem cells is well established for the induction of LG organoid formation and differentiation into acinar or ductal-like...

two- and three-dimensional live cell imaging of dna damage response proteins

Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins

This protocol describes a method for visualizing a DNA double-strand break signaling protein activated in response to DNA damage as well as its localization during...

live cell imaging of the tgf-	&beta;/smad3 signaling pathway in vitro and in vivo using an adenovirus reporter system

Live Cell Imaging of the TGF-	&amp;beta;/Smad3 Signaling Pathway &lt;em&gt;In Vitro&lt;/em&gt; and &lt;em&gt;In Vivo&lt;/em&gt; Using an Adenovirus Reporter System

Here, we present a protocol for live cell imaging of TGF-&#946;/Smad3 signaling activity using an adenovirus reporter system. This system tracks transcriptional activity in real-time and can be applied to both single cells in vitro and in live animalmodels.

Live Cell Imaging of the TGF-	&beta;/Smad3 Signaling Pathway In Vitro and In Vivo Using an Adenovirus Reporter System

Under a dissecting microscope, remove the embryos from the uterine horn, and their individual amniotic sacs, placing each embryo on the underside of the lid of a 12-well plate on ice as they are harvested. Use filter paper to remove any liquids surrounding each embryo without touching the embryos themselves, and submerge the embryos in liquid 4% low-melting...

alignment of visible-light optical coherence tomography fibergrams with confocal images of the same mouse retina

Author Spotlight: Advancements in In Vivo and Ex Vivo Retinal Imaging for Improved Glaucoma Diagnosis and Treatment 

The present protocol outlines the steps for aligning in vivo visible-light optical coherence tomography fibergraphy (vis-OCTF) images with ex vivo confocal images of the same mouse retina for the purpose of verifying the observed retinal ganglion cell axon bundle morphology in the in vivo images.

Mouse Retina OCT Fibergram Alignment with Confocal Images

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the ex vivo culture and pattern recognition receptor stimulation of mouse intestinal organoids

The Ex Vivo Culture and Pattern Recognition Receptor Stimulation of Mouse Intestinal Organoids

Here, a protocol to harvest, maintain, and treat mouse small intestinal organoids with pathogen associated molecular patterns (PAMPs) and Listeria monocytogenes is described, as well as emphasis on gene expression and proper normalization techniques for...

The Ex Vivo Culture and Pattern Recognition Receptor Stimulation of Mouse Intestinal Organoids

Method for Culture of Early Chick Embryos ex vivo (New Culture)

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ideal tool for studying  the formation and patterning of brain, neural tube, somite and heart primordia. Applications of chick embryo culture include electroporation of DNA or RNA constructs in order to analyze gene function, grafts of growth factor coated beads such as FGFs and BMPs , as well as whole mount in situ hybridization and immunohistochemistry. This video demonstrates the different steps in chick embryo culture; First, the embryo is explanted in saline. Then, the embryo is centered on a glass ring. The membranes surrounding the embryo are lifted along the walls of the ring. The ring is then placed in a culture dish containing a pool of albumine. The culture dish is sealed and placed in a humid chamber, where the embryo is cultured for up to 24 hrs. Finally, the embryo is removed from the ring, fixed and processed for further applications. A troubleshooting guide is also presented.

Method for Culture of Early Chick Embryos ex vivo New Culture

This video demonstrates New culture, a method by which chick embryos are cultured outside the egg for up to 24 hr. This method enables one to study early development (primitive streak to 14 som.), a period corresponding to E7-9 in mouse. Applications of this technique include electroporation, in situ hybridization and immunohistochemistry.

The chick embryo is a valuable tool in the study of early embryonic development. Its transparency, accessibility and ease of manipulation, make it an ...

In vivo Imaging and Therapeutic Treatments in an Orthotopic Mouse Model of Ovarian Cancer

Human cancer and response to therapy is better represented in orthotopic animal models. This paper describes the development of an orthotopic mouse model of ovarian cancer, treatment of cancer via oral delivery of drugs, and monitoring of tumor cell behavior in response to drug treatment in real time using in vivo imaging system. In this orthotopic model, ovarian tumor cells expressing luciferase are applied topically by injecting them directly into the mouse bursa where each ovary is enclosed. Upon injection of D-luciferin, a substrate of firefly luciferase, luciferase-expressing cells generate bioluminescence signals. This signal is detected by the in vivo imaging system and allows for a non-invasive means of monitoring tumor growth, distribution, and regression in individual animals. Drug administration via oral gavage allows for a maximum dosing volume of 10 mL/kg body weight to be delivered directly to the stomach and closely resembles delivery of drugs in clinical treatments. Therefore, techniques described here, development of an orthotopic mouse model of ovarian cancer, oral delivery of drugs, and in vivo imaging, are useful for better understanding of human ovarian cancer and treatment and will improve targeting this disease.

In vivo Imaging and Therapeutic Treatments in an Orthotopic Mouse Model of Ovarian Cancer

Orthotopic animal models of ovarian cancer replicate better human disease and therefore enhance our understanding of cancer progression and tumor response to therapy. A mouse model receives an intrabursal injection of luciferase-expressing ovarian tumor cells. Treatment is administered via oral gavage. Tumor growth is monitored by in vivo imaging system.

Human cancer and response to therapy is better represented in orthotopic animal models.  This paper describes the development of an orthotopic mouse model ...

An ex-ovo Chicken Embryo Culture System Suitable for Imaging and Microsurgery Applications

Understanding the relationships between genetic and microenvironmental factors that drive normal and malformed embryonic development is fundamental for discovering new therapeutic strategies. Advancements in imaging technology have enabled quantitative investigation of the organization and maturing of the body plan, but later stage embryonic morphogenesis is less clear. Chicken embryos are an attractive vertebrate animal model system for this application because of its ease of culture and surgical manipulation. Early embryos can be cultured for a short time on filter paper rings, which enables complete optical access for cell patterning and fate studies1,2. Studying advanced developmental processes such as cardiac morphogenesis are traditionally performed through a window of the eggshell3-5, but this technique limits optical access due to window size. We previously developed a simple method to culture whole embryos ex-ovo on hexagonal weigh boats for up to 10 days, which enabled high resolution imaging via ultrasonography6,7. These cultures were difficult to transport, limiting the types of imaging tools available for live experiments. We here present an improved shell-less culture system with a cost-effective, portable environmental chamber. Eggs were cracked onto a hammock created by a polyurethane membrane (cling wrap) affixed circumferentially to a plastic cup partially filled with sterile water. The dimensions of the circumference and depth of the hammock were both critical to maintain surface tension, while the mechanics of the hammock and water beneath helped dampen vibrations induced by transportation. A small footprint circulating water bath was also developed to enable continuous temperature control during experimentation. We demonstrate the ability to culture embryos in this way for at least 14 days without morphogenic defect or delay and employ this system in several microsurgical and imaging applications.

An ex-ovo Chicken Embryo Culture System Suitable for Imaging and Microsurgery Applications

In this article, we present a simple methodology to enable long-term ex-ovo avian embryo culture. This technique is ideal for longitudinal experimentation requiring complete optical accessibility and/or sterile transportation in avian embryos.

Understanding the relationships between genetic and microenvironmental factors that drive normal and malformed embryonic development is fundamental for ...

The Method of Rodent Whole Embryo Culture using the Rotator-type Bottle Culture System

Whole embryo culture (WEC) technique has been developed in 1950's by New and his colleagues, and applied for developmental biology 1. Although development and growth of mammalian embryos are critically dependent on the function of the placenta, WEC technique allows us to culture mouse and rat embryos ex vivo condition during limited periods corresponding to midgestation stages during embryonic day (E) 6.5-E12.5 in the mouse or E8.5-E14.5 in the rat 2, 3, 4. In WEC, we can directly target desired areas of embryos using fine glass capillaries because embryos can be manipulated under the microscope. Therefore, rodent WEC is very useful technique when we want to study dynamic developmental processes of postimplanted mammalian embryos. Up to date, several types of WEC systems have been developed 1. Among those, the rotator-type bottle culture system is most popular and suitable for long-term culture of embryos at midgestation, i.e., after E9.5 and E11.5 in the mouse and rat, respectively 1. In this video protocol, we demonstrate our standard procedures of rat WEC after E12.5 using a refined model of the original rotator system, which was designed by New and Cockroft 5, 6, and introduce various applications of WEC technique for studies in mammalian developmental biology.

Whole embryo culture technique allows us to culture mouse and rat embryos ex vivo condition during limited periods corresponding to midgestation stages. In this video protocol, we demonstrate our standard procedures of rat whole embryo culture after E12.5 using the rotator-type bottle culture system.

Whole embryo culture (WEC) technique has been developed in 1950's by New and his colleagues, and applied for developmental biology 1. Although development ...

A System for ex vivo Culturing of Embryonic Pancreas

The pancreas controls vital functions of our body, including the production of digestive enzymes and regulation of blood sugar levels1. Although in the past decade many studies have contributed to a solid foundation for understanding pancreatic organogenesis, important gaps persist in our knowledge of early pancreas formation2. A complete understanding of these early events will provide insight into the development of this organ, but also into incurable diseases that target the pancreas, such as diabetes or pancreatic cancer. Finally, this information will generate a blueprint for developing cell-replacement therapies in the context of diabetes.
 During embryogenesis, the pancreas originates from distinct embryonic outgrowths of the dorsal and ventral foregut endoderm at embryonic day (E) 9.5 in the mouse embryo3,4. Both outgrowths evaginate into the surrounding mesenchyme as solid epithelial buds, which undergo proliferation, branching and differentiation to generate a fully mature organ2,5,6. Recent evidences have suggested that growth and differentiation of pancreatic cell lineages, including the insulin-producing &beta;-cells, depends on proper tissue-architecture, epithelial remodeling and cell positioning within the branching pancreatic epithelium7,8. However, how branching morphogenesis occurs and is coordinated with proliferation and differentiation in the pancreas is largely unknown. This is in part due to the fact that current knowledge about these developmental processes has relied almost exclusively on analysis of fixed specimens, while morphogenetic events are highly dynamic.
 Here, we report a method for dissecting and culturing mouse embryonic pancreatic buds ex vivo on glass bottom dishes, which allow direct visualization of the developing pancreas (Figure 1). This culture system is ideally devised for confocal laser scanning microscopy and, in particular, live-cell imaging. Pancreatic explants can be prepared not only from wild-type mouse embryos, but also from genetically engineered mouse strains (e.g. transgenic or knockout), allowing real-time studies of mutant phenotypes. Moreover, this ex vivo culture system is valuable to study the effects of chemical compounds on pancreatic development, enabling to obtain quantitative data about proliferation and growth, elongation, branching, tubulogenesis and differentiation. In conclusion, the development of an ex vivo pancreatic explant culture method combined with high-resolution imaging provides a strong platform for observing morphogenetic and differentiation events as they occur within the developing mouse embryo.

A System for ex vivo Culturing of Embryonic Pancreas

Here, we describe a method for isolation, culture and manipulation of mouse embryonic pancreas. This represents an excellent ex vivo system for studying various aspects of pancreatic development, including morphogenesis, differentiation and growth. Pancreatic bud explants can be cultured for several days and used in a range of different applications, including whole-mount immunofluorescence and live imaging.

The pancreas controls vital functions of our body,  including the production of digestive enzymes and regulation of blood sugar  levels1. Although in the ...

Double-strand breaks (DSBs) are the most deleterious DNA lesions a cell can encounter. If left unrepaired, DSBs harbor great potential to generate mutations and chromosomal aberrations1. To prevent this trauma from catalyzing genomic instability, it is crucial for cells to detect DSBs, activate the DNA damage response (DDR), and repair the DNA. When stimulated, the DDR works to preserve genomic integrity by triggering cell cycle arrest to allow for repair to take place or force the cell to undergo apoptosis. The predominant mechanisms of DSB repair occur through nonhomologous end-joining (NHEJ) and homologous recombination repair (HRR) (reviewed in2). There are many proteins whose activities must be precisely orchestrated for the DDR to function properly. Herein, we describe a method for 2- and 3-dimensional (D) visualization of one of these proteins, 53BP1.
The p53-binding protein 1 (53BP1) localizes to areas of DSBs by binding to modified histones3,4, forming foci within 5-15 minutes5. The histone modifications and recruitment of 53BP1 and other DDR proteins to DSB sites are believed to facilitate the structural rearrangement of chromatin around areas of damage and contribute to DNA repair6. Beyond direct participation in repair, additional roles have been described for 53BP1 in the DDR, such as regulating an intra-S checkpoint, a G2/M checkpoint, and activating downstream DDR proteins7-9. Recently, it was discovered that 53BP1 does not form foci in response to DNA damage induced during mitosis, instead waiting for cells to enter G1 before localizing to the vicinity of DSBs6. DDR proteins such as 53BP1 have been found to associate with mitotic structures (such as kinetochores) during the progression through mitosis10.
In this protocol we describe the use of 2- and 3-D live cell imaging to visualize the formation of 53BP1 foci in response to the DNA damaging agent camptothecin (CPT), as well as 53BP1's behavior during mitosis. Camptothecin is a topoisomerase I inhibitor that primarily causes DSBs during DNA replication. To accomplish this, we used a previously described 53BP1-mCherry fluorescent fusion protein construct consisting of a 53BP1 protein domain able to bind DSBs11. In addition, we used a histone H2B-GFP fluorescent fusion protein construct able to monitor chromatin dynamics throughout the cell cycle but in particular during mitosis12. Live cell imaging in multiple dimensions is an excellent tool to deepen our understanding of the function of DDR proteins in eukaryotic cells.

This protocol describes a method for visualizing a DNA double-strand break signaling protein activated in response to DNA damage as well as its localization during mitosis.

Double-strand breaks (DSBs) are the most deleterious DNA lesions a cell can encounter. If left unrepaired, DSBs harbor great potential to generate ...

Mid-gestation stage mouse embryos were cultured utilizing a serum-free culture medium prepared from commercially available stem cell media supplements in an oxygenated rolling bottle culture system. Mouse embryos at E10.5 were carefully isolated from the uterus with intact yolk sac and in a process involving precise surgical maneuver the embryos were gently exteriorized from the yolk sac while maintaining the vascular continuity of the embryo with the yolk sac. Compared to embryos prepared with intact yolk sac or with the yolk sac removed, these embryos exhibited superior survival rate and developmental progression when cultured under similar conditions. We show that these mouse embryos, when cultured in a defined medium in an atmosphere of 95% O2 / 5% CO2 in a rolling bottle culture apparatus at 37 &#176;&#8203;C for 16-40 hr, exhibit morphological growth and development comparable to the embryos developing in utero. We believe this method will be useful for investigators needing to utilize whole embryo culture to study signaling interactions important in embryonic organogenesis.

Serum utilized in embryo cultures contains unknown components that can affect the outcome of experiments especially in studies involving signaling interactions. Here we utilized a serum-free oxygenated culture system and show that mid-gestation mouse embryos cultured for 16-40 hr&#160;exhibit morphological development comparable to embryos developing in utero.

Mid-gestation stage mouse embryos were cultured utilizing a serum-free culture medium prepared from commercially available stem cell media supplements in ...

Melanoblasts are the neural crest derived precursors of melanocytes; the cells responsible for producing the pigment in skin and hair. Melanoblasts migrate through the epidermis of the embryo where they subsequently colonize the developing hair follicles1,2. Neural crest cell migration is extensively studied in vitro but in vivo methods are still not well developed, especially in mammalian systems. One alternative is to use ex vivo organotypic culture3-6. Culture of mouse embryonic skin requires the maintenance of an air-liquid interface (ALI) across the surface of the tissue3,6. High resolution live-imaging of mouse embryonic skin has been hampered by the lack of a good method that not only maintains this ALI but also allows the culture to be inverted and therefore compatible with short working distance objective lenses and most confocal microscopes. This article describes recent improvements to a method that uses a gas permeable membrane to overcome these problems and allow high-resolution confocal imaging of embryonic skin in ex vivo culture6. By using a melanoblast specific Cre-recombinase expressing mouse line combined with the R26YFPR reporter line we are able to fluorescently label the melanoblast population within these skin cultures. The technique allows live-imaging of melanoblasts and observation of their behavior and interactions with the tissue in which they develop. Representative results are included to demonstrate the capability to live-image 6&#160;cultures in parallel.

We describe the dissection and ex vivo culture of mouse embryonic skin. The culture system maintains an air-liquid interface across the tissue surface and allows imaging on an inverted microscope. Melanoblasts, a component of the developing skin, are fluorescently labeled allowing their behavior to be observed using confocal microscopy.

Melanoblasts are the neural crest derived precursors of melanocytes; the cells responsible for producing the pigment in skin and hair. Melanoblasts ...

The thyroid is a bilobated endocrine gland localized at the base of the neck, producing the thyroid hormones T3, T4, and calcitonin. T3 and T4 are produced by differentiated thyrocytes, organized in closed spheres called follicles, while calcitonin is synthesized by C-cells, interspersed in between the follicles and a dense network of blood capillaries. Although adult thyroid architecture and functions have been extensively described and studied, the formation of the &#8220;angio-follicular&#8221; units, the distribution of C-cells in the parenchyma and the paracrine communications between epithelial and endothelial cells is far from being understood.
This method describes the sequential steps of mouse embryonic thyroid anlagen dissection and its culture on semiporous filters or on microscopy plastic slides. Within a period of four days, this culture system faithfully recapitulates in vivo thyroid development. Indeed, (i) bilobation of the organ occurs (for e12.5 explants), (ii) thyrocytes precursors organize into follicles and polarize, (iii) thyrocytes and C-cells differentiate, and (iv) endothelial cells present in the microdissected tissue proliferate, migrate into the thyroid lobes, and closely associate with the epithelial cells, as they do in vivo.
Thyroid tissues can be obtained from wild type, knockout or fluorescent transgenic embryos. Moreover, explants culture can be manipulated by addition of inhibitors, blocking antibodies, growth factors, or even cells or conditioned medium. Ex vivo development can be analyzed in real-time, or at any time of the culture by immunostaining and RT-qPCR.
In conclusion, thyroid explant culture combined with downstream whole-mount or on sections imaging and gene expression profiling provides a powerful system for manipulating and studying morphogenetic and differentiation events of thyroid organogenesis.

This protocol describes dissection of mouse embryonic thyroid anlagen and the culture of explants on semiporous filters or on microscopy plastic slides. This system is ideal to study morphogenetic or differentiation events occurring during thyroid development of wild type or knockout embryos, and is amenable to gain- and loss-of-function experiments.

The thyroid is a bilobated endocrine gland localized at the base of the neck, producing the thyroid hormones T3, T4, and calcitonin. T3 and T4 are ...

FRET Imaging in Three-dimensional Hydrogels

Imaging of F&#246;rster resonance energy transfer (FRET)&#160;is a powerful tool for examining cell biology in real-time. Studies utilizing FRET commonly employ two-dimensional (2D) culture, which does not mimic the three-dimensional (3D) cellular microenvironment. A method to perform quenched emission FRET imaging using conventional widefield epifluorescence microscopy of cells within a 3D hydrogel environment is presented. Here an analysis method for ratiometric FRET probes that yields linear ratios over the probe activation range is described. Measurement of intracellular cyclic adenosine monophosphate (cAMP) levels is demonstrated in chondrocytes under forskolin stimulation using a probe for EPAC1 activation (ICUE1) and the ability to detect differences in cAMP signaling dependent on hydrogel material type, herein a photocrosslinking hydrogel (PC-gel, polyethylene glycol dimethacrylate) and a thermoresponsive hydrogel (TR-gel). Compared with 2D FRET methods, this method requires little additional work. Laboratories already utilizing FRET imaging in 2D can easily adopt this method to perform cellular studies in a 3D microenvironment. It can further be applied to high throughput drug screening in engineered 3D microtissues. Additionally, it is compatible with other forms of FRET imaging, such as anisotropy measurement and fluorescence lifetime imaging (FLIM), and with advanced microscopy platforms using confocal, pulsed, or modulated illumination.

F&#246;rster resonance energy transfer (FRET) imaging is a powerful tool for real-time cell biology studies. Here a method for FRET imaging cells in physiologic three-dimensional (3D) hydrogel microenvironments using conventional epifluorescence microscopy is presented. An analysis for ratiometric FRET probes that yields linear ratios over the activation range is described.

Imaging of F&#246;rster resonance energy transfer (FRET)&#160;is a powerful tool for examining cell biology in real-time. Studies utilizing FRET commonly ...