We thank Dr. U. Ashery for the gift of NPY-mRFP cDNA. We thank Drs. M. J. Kofron, L. Mittleman, M. Shaharbani, and Y. Zilberstein for invaluable assistance with microscopy and image analyses. We also thank Dr. Joseph Orly for critical reading of this manuscript. &#160;This work was supported by a grant from the Israel Science Foundation, founded by&#160;the Israel Academy for Sciences (1139/12 to R.S-E.).

1. Preparation of RBL Cell Culture Media
<ol>
	<li>Mix 500 ml of low glucose Dulbecco&#39;s modified Eagle&#39;s medium (DMEM) with 56&#160;ml of fetal bovine serum (this makes 10% FBS), and then add 5.5 ml of penicillin streptomycin (this makes ~1% PEST).</li>
	<li>Filter the media by using 500-1,000 ml Bottle-Top Vacuum Filters with 0.22 &#956;m pore size and store at 4 &#176;C.</li>
</ol>
2. Culture of RBL Cells
<ol>
	<li>Grow RBL cells in a humidified atmosphere of 5% CO2 at 37 ...

<ol>
	<li>Abonia, J. P., 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=Involvement+of+mast+cells+in+eosinophilic+esophagitis.">Involvement of mast cells in eosinophilic esophagitis.</a> J Allergy Clin Immunol. 126 (1), 140-149 (2010).</li><li>Galli, S. J., Tsai, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mast+cells+in+allergy+and+infection:+versatile+effector+and+regulatory+cells+in+innate+and+adaptive+immunity.">Mast cells in allergy and infection: versatile effector and regulatory cells in innate and adaptive immunity.</a> Eur J Immunol. 40 (7), 1843-1851 (2010).</li><li>Ribatti, D., Crivellato, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+controversial+role+of+mast+cells+in+tumor+growth.">The controversial role of mast cells in tumor growth.</a> International Review of Cell and Molecular Biology. 275, 89-131 (2009).</li><li>Ribatti, D., Crivellato, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mast+cells,+angiogenesis+and+cancer.">Mast cells, angiogenesis and cancer.</a> Adv Exp Med Biol. 716, 270-288 (2011).</li><li>Tsai, M., Grimbaldeston, M., Galli, S. 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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=Demonstration+that+human+mast+cells+arise+from+a+progenitor+cell+population+that+is+CD34(+),+c-kit(+),+and+expresses+aminopeptidase+N+(CD13).">Demonstration that human mast cells arise from a progenitor cell population that is CD34(+), c-kit(+), and expresses aminopeptidase N (CD13).</a> Blood. 94 (7), 2333-2342 (1999).</li><li>Metcalfe, D. D., Baram, D., Mekori, Y. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mast+cells.">Mast cells.</a> Physiol Rev. 77 (4), 1033-1079 (1997).</li><li>Gilfillan, A. M., Austin, S. J., Metcalfe, D. 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H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mast+cell+proteases+as+protective+and+inflammatory+mediators.">Mast cell proteases as protective and inflammatory mediators.</a> Adv Exp Med Biol. 716, 212-234 (2011).</li><li>Lundequist, A., Pejler, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Biological+implications+of+preformed+mast+cell+mediators.">Biological implications of preformed mast cell mediators.</a> Cell Mol Life Sci. 68 (6), 965-975 (2011).</li><li>Metz, M., Maurer, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mast+cells--key+effector+cells+in+immune+responses.">Mast cells--key effector cells in immune responses.</a> Trends Immunol. 28 (5), 234-241 (2007).</li><li>Gordon, J. R., Burd, P. R., Galli, S. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mast+cells+as+a+source+of+multifunctional+cytokines.">Mast cells as a source of multifunctional cytokines.</a> Immunol Today. 11 (12), 458-464 (1990).</li><li>Azouz, N. 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We describe an innovative strategy that combines quantification of MCs exocytosis and four (x, y, z, t) dimension quantifications by time-lapsed three-dimensional imaging of the SGs in living cells using a reporter gene for exocytosis. This technique enables screening of families of proteins for their impact on MC function such as monitoring SGs starting as early as their exit from the Golgi through their maturation, acquisition of exocytosis competence and degranulation. The combination of&#160;measurements of exocytosi...

Mast Cells (MC) are immune cells that are best known for their involvement in allergic and inflammatory reactions such as arthritis, asthma, eosinophilic esophagitis, chronic dermatitis and anaphylactic shock 1,2 as well as other pathologies including coronary artery disease 3,5 and cancer 3,4. In addition, MCs play important roles in innate and adaptive immunity, both in host defense against bacteria and parasites and by suppression of immune responses, for example inducing allograft tolerance 5,6 .
MCs originate from the bone marrow, developing from CD34+/CD117+ pluripotent progenitor cells 7. Committed bone marrow MC&#160;progenitors are released into the bloodstream and migrate into the peripheral tissues localizing predominantly within connective tissues and epithelial surfaces 8. Maturation and terminal differentiation are eventually achieved under the influence of cytokines within the surrounding milieu 8,9 .
MCs can be activated by an allergen (antigen, Ag), whose encounter resulted in the generation of immunoglobulin E (IgE) type antibodies. Binding of such IgE to the MC&#8217;s Fc&#949;RI receptors, followed by cross-linking of cell bound IgE upon re-exposure to the same Ag, results in Fc&#949;RI aggregation and initiation of a signaling cascade that culminates in cell degranulation [reviewed in 10,11]. MCs are also activated, independently of IgE, by neuropeptides 5,12, toxins 13 , bacterial and viral antigens 14,15, a number of positively charged peptides collectively referred to as basic secretagogues, immune cells and cytokines 5,13,12,16,17. MCs are also activated by many of their own released mediators, which further amplify the inflammatory response.
MCs are packed with secretory granules (SGs) that contain immunoregulatory mediators, including vasoactive amines, such as histamine and serotonin (in rodents), proteoglycans, proteases, such as chymase and tryptase, vascular endothelial growth factor and several cytokines and chemokines 8,9. These mediators are &#8220;ready to go&#8221; and once MCs are activated by an appropriate stimulus, these mediators are released from the cells by regulated exocytosis (degranulation) in a matter of seconds to minutes 18,19. This initial event is followed by the de novo synthesis and release of a large array of biologically potent substances, including arachidonic acid metabolites, multiple cytokines and chemokines 20,21,22. Release of newly synthesized products occurs independently of SG release. Collectively, these mediators initiate early and late phase inflammatory and allergic responses. Therefore, understanding the mechanisms accounting for MC activation and degranulation are both of theoretical and clinical importance.
The difficulty to genetically manipulate primary and cultured MCs has hampered the attempts to elucidate the mechanisms underlying MC degranulation, which remained poorly resolved. To overcome this problem we developed a reporter based assay by co-transfecting the mucosal mast cell line, rat basophilic leukemia (RBL)-2H3 (herein referred to as RBL) or bone marrow derived MCs&#160;(BMMCs) 30 with a gene of interest and Neuropeptide Y (NPY) fused to monomeric RFP (mRFP), as a SG reporter.
NPY was previously shown to recapitulate the behavior of endogenous SG markers in other systems. Moreover, because mRFP fluorescence is pH insensitive, expression of NPY-mRFP allows visualization of the acidic SGs as well as quantitative assessment of exocytosis by using 96-well plates and a fluorescence plate reader. We have shown that NPY-mRFP is delivered to the acidic SGs of RBL cells and BMMCs and is released from the cells in a regulated fashion alongside the endogenous SG&#160;cargo (i.e., &#946;-hexosaminidase and serotonin) 30,32 . This protocol provides a high-resolution imaging-based methodology that allows screening genes of interest for their phenotypic and functional impact on SG characteristics and degranulation in RBL cells 32. Specifically, this protocol allows real time tracking of MC SGs and quantification of their area or volume size, their number, kinetics of assembly, their movement along the cell cytoskeleton and their ultimate fusion with the plasma membrane under different conditions. For example, sensitizing the cells with DNP-specific IgE and triggering the cells with a multivalent Ag (DNP conjugated serum albumin) under different perturbations (i.e., knockdown of genes of interest, over expression of wt or mutant genes, or pharmacological manipulations) and comparing to control cells.

<table border="0" cellpadding="0" cellspacing="0" width="844">
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		<col />
	</colgroup>
	<tbody>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Name of Material/ Equipment</td>
			<td style="width:128px;">Company</td>
			<td style="width:139px;">Catalog Number</td>
			<td style="width:156px;">Comments/Description</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;width:421px;">DMEM</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td>D6046-500ML</td>
			<td style="width:156px;">Warm in 37 &#176;C water bath before use</td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;">Fetal Bovine Serum</td>
			<td style="width:128px;">GE health care Life sciences</td>
			<td>SH30071.01</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Penicillin-Streptomycin</td>
			<td style="width:128px;">Life technologies</td>
			<td></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Cellulose acetate membrane, pore size 0.22&#160;&#956;m</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">CLS430769-1EA</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Corning tissue-culture treated culture dishes</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">CLS430167</td>
			<td></td>
		</tr>
		<tr height="35">
			<td height="35" style="height:35px;">Trypsin/EDTA Solution (TE)</td>
			<td style="width:128px;">Life technologies</td>
			<td>R001100</td>
			<td style="width:156px;">Warm in 37 &#176;C water bath before use</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">PIPES dipotassium salt</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">108321-27-3&#160;</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Calcium acetate hydrate</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td>114460-21-8</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Magnesium acetate tetrahydrate</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">M5661&#160;</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">L-Glutamic acid potassium salt monohydrate (Potassium glutamate)</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">G1501</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">4 mm electroporation cuvettes</td>
			<td style="width:128px;">cell projects</td>
			<td style="width:139px;">EP-104</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">GENE PULSER WITH PULSE CONTROLLER &#38; CAPACITANCE</td>
			<td style="width:128px;">Bio rad</td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Chambered coverglass</td>
			<td style="width:128px;">Thermo scientific</td>
			<td align="right" style="width:139px;">155411</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">24 well, flat bottom</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">CLS3524</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Corning 96 well plates</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">CLS3367 or CLS390</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">96 well plate fluorescence reader- Infinite 200</td>
			<td style="width:128px;">Tecan</td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Calcium ionophore A23187</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td height="20" style="height:20px;width:139px;">C7522</td>
			<td>Avoid from direct light exposure</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">12-O-tetradecanoyl-13-acetate (TPA)</td>
			<td>Calbiochem</td>
			<td height="20" style="height:20px;width:139px;">P3766</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">anti-DNP monoclonal IgE</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td>D8406&#160;</td>
			<td height="20" style="height:20px;width:156px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">DNP-BSA/ DNP-HAS</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td style="width:139px;">A6661</td>
			<td>Avoid from direct light exposure</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Triton-x-100</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td style="width:139px;">T8787</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Confocal fluorescent microscope:</td>
			<td style="width:128px;"></td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Zeiss LSM 510</td>
			<td style="width:128px;"></td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Leica</td>
			<td style="width:128px;">SP5</td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Nikon A1 inverted</td>
			<td style="width:128px;"></td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Imaris software</td>
			<td style="width:128px;">BITLANE</td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Microsoft exel or Prism or other analyses software</td>
			<td style="width:128px;"></td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Other reagent:</td>
			<td style="width:128px;"></td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Magnesium Chloride</td>
			<td style="width:128px;">MERK</td>
			<td style="width:139px;">5833</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Sodium chloride</td>
			<td style="width:128px;">MERK</td>
			<td style="width:139px;">6404</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Calcium chloride&#160;</td>
			<td style="width:128px;">MERK</td>
			<td style="width:139px;">2382</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Bovine serum albumin&#160;</td>
			<td style="width:128px;">Sigma-Aldrich</td>
			<td style="width:139px;">A4503</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Glucose</td>
			<td style="width:128px;">BDH Laboratories</td>
			<td style="width:139px;">284515V</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;">Monosodium phosphate&#160;</td>
			<td style="width:128px;">MERK</td>
			<td style="width:139px;">5345</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:421px;">Sterile water</td>
			<td style="width:128px;"></td>
			<td style="width:139px;"></td>
			<td></td>
		</tr>
	</tbody>
</table>

investigating mast cell secretory granules; from biosynthesis to exocytosis

Mast Cells (MC) are secretory cells of the immune system that accomplish their physiological and pathological functions by releasing pre-formed and newly synthesized allergic, inflammatory and immunoregulatory mediators. MCs&#8217; mediators affect multiple tissues and organs culminating in allergic and immune responses. The synthesis, storage and release of the MC mediators are highly regulated. The pre-formed mediators are packed in cytoplasmic secretory granules&#160;(SG) that fuse with the plasma membrane and release their content by regulated exocytosis. We present a protocol, based on the co-expression of a gene of interest with a reporter gene that is targeted to the SGs and is released in a regulated fashion alongside the endogenous SG mediators. The protocol enables high resolution four dimensional confocal analyses of the MC SGs and monitoring their timeline from biogenesis to triggered exocytosis. Thus, using this protocol for screening genes of interest for their phenotypic and functional impact allows deciphering the molecular mechanisms that govern the biogenesis and exocytosis of the MC SGs and identifying the regulators involved. Thereby, further insights into the cellular mechanisms that account for MCs function in health and disease should be provided.

Because of the low transfection efficiency of MCs, genetic manipulations are unlikely to leave an impact on readouts of average secretion measured by endogenous SGs mediators. Nevertheless, by establishing complete co-expression of the reporter gene NPY-mRFP and the co-transfected plasmid at the same cells, monitoring of NPY-mRFP results in monitoring exclusively the cell population that expresses the gene of interest. Therefore, the advantage of this assay compared to conventional methods is the ability to selectively m...

Watch this Scientific Journal Video about Investigating Mast Cell Secretory Granules; from Biosynthesis to Exocytosis at JoVE.com

Investigating Mast Cell Secretory Granules; from Biosynthesis to Exocytosis

The goal of the present&#160;protocol was to develop a method that will allow functional genomic analyses of mast cell secretion. The protocol is based on quantitative assessment of the release of a fluorescent reporter gene cotrasfected with the gene of interest and real time&#160;analyses of the secretory granule&#39;s morphology.

Mast Cells (MC) are secretory cells of the immune system that accomplish their physiological and pathological functions by releasing pre-formed and newly ...

investigating-mast-cell-secretory-granules-from-biosynthesis-to

Research

JoVE Journal

Immunology and Infection

13.0K ビュー.  Sackler Faculty of Medicine, Tel Aviv University. 本プロトコルの目的は、マスト細胞の分泌の機能的ゲノム解析を可能にする方法を開発することであった。プロトコルは、目的の遺伝子とcotrasfected蛍光レポーター遺伝子の放出を定量的に評価し、実時間に基づいて分泌顆粒の形態の分析。 

ビデオ: Investigating Mast Cell Secretory Granules; from Biosynthesis to Exocytosis

The goal of the present&#160;protocol was to develop a method that will allow functional genomic analyses of mast cell secretion. The protocol is based on quantitative assessment of the release of a fluorescent reporter gene cotrasfected with the gene of interest and real time&#160;analyses of the secretory granule&#39;s...

measuring mast cell exocytosis via neuropeptide y monomeric red fluorescent protein release

This video demonstrates mast cell exocytosis induced by an activating reagent that includes a calcium ionophore, initiating the release of secretory granules containing the fluorescent reporter protein NPY-mRFP. Subsequently, we quantitatively assess the exocytosis by measuring the released NPY-mRFP using a fluorescence plate...

Measuring Mast Cell Exocytosis via Neuropeptide Y Monomeric Red Fluorescent Protein Release

imaging fitc-dextran as a reporter for regulated exocytosis

Imaging FITC-dextran as a Reporter for Regulated Exocytosis

Here we detail a method for live cell imaging of regulated exocytosis. This method utilizes FITC-dextran, which accumulates in lysosome-related organelles, as a reporter. This simple method also allows distinguishing between different modes of regulated exocytosis in cells that are difficult to manipulate...

an in vitro technique to visualize exocytosis of secretory granules in mast cells

This video demonstrates a technique to visualize exocytosis in mast cells. The cells are incubated with FITC-dextran &#8212; a fluorescent reporter &#8212; which is taken up by cells inside secretory granules (SGs), where the acidic pH quenches its fluorescence. Upon stimulation of granule exocytosis, the medium&#39;s higher pH induces reporter fluorescence inside the fused SGs, which is visualized using a fluorescence...

An In Vitro Technique to Visualize Exocytosis of Secretory Granules in Mast Cells

Dissolve ammonium chloride powder in Tyrode&#39;s buffer to create a 400-millimolar ammonium chloride solution. Next, aspirate the media from the chambered coverglass, and replace it with 300 microliters of pre-warmed Tyrode&#39;s buffer. After repeating the washing process two times, replenish the chamber with 300 microliters of Tyrode&#39;s...

monitoring the effect of osmotic stress on secretory vesicles and exocytosis

Monitoring the Effect of Osmotic Stress on Secretory Vesicles and Exocytosis

Osmotic stress affects exocytosis and the amount of neurotransmitter released during this process. We demonstrate how combining electrochemical methods together with transmission electron microscopy can be used to study the effect of extracellular osmotic pressure on exocytosis activity, vesicle quantal size, and the amount of neurotransmitter released during...

Carefully transfer the supernatants of each well to a 96-well plate. Place the plate on ice, and protect from light. The supernatants contain the chimeric peptide NPY-mRFP that was released from the...

analyzing the functions of mast cells in vivo using 'mast cell knock-in' mice

Analyzing the Functions of Mast Cells In Vivo Using &#039;Mast Cell Knock-in&#039; Mice

We describe a method for the generation of in vitro derived mast cells, their engraftment into mast cell-deficient mice, and the analysis of the phenotype, numbers and distribution of engrafted mast cells at different anatomical sites. This protocol can be used to assess the functions of mast cells in...

Analyzing the Functions of Mast Cells In Vivo Using 'Mast Cell Knock-in' Mice

a technique to isolate primary mast cells from a murine peritoneal cavity

This video demonstrates a peritoneal lavage method for isolating mature connective tissue-type mast cells from the peritoneal cavity of adult mice. Upon isolating a mixture of primary immune cells from the peritoneal cavity, selective proliferation of mast cells is performed under appropriate culture...

A Technique to Isolate Primary Mast Cells from a Murine Peritoneal Cavity

methods to classify cytoplasmic foci as mammalian stress granules

Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules

Stress Granules (SGs) are nonmembranous cytoplasmic structures that form in cells exposed to a variety of stresses. SGs contain mRNAs, RNA-binding proteins, small ribosomal subunits, translation-related factors, and various cell signaling proteins. This protocol describes a workflow that uses several experimental approaches to detect, characterize, and quantify bona fide...

mast cell degranulation assay to study the effect of a target chemical

This video demonstrates a colorimetric assay to determine the degranulation activity of mast cells. The enzyme released by the mast cells hydrolyzes the substrate and produces a colored product. The degranulation activity of the mast cells was measured as the percentage release of enzymes outside the cell normalized with the total enzyme content in the...

Mast Cell Degranulation Assay to Study the Effect of a Target Chemical

Next, inject 7 milliliters of ice-cold RPMI medium in the peritoneal cavity by inserting a 27-gauge needle carefully in the peritoneum. Do not perforate any organs and use a spot in the region of the epididymal fat to reduce the risk of an organ...

Transfer 120 microliters of the supernatant to a flat-bottom 96-well plate, and place it on ice. Carefully avoid touching the cell pellets, but completely aspirate the supernatant. Next, add 125 microliters of lysis buffer to the cell pellets. Incubate the cell pellets for 5 minutes at room temperature, and resuspend them after the incubation by repeated...

an immunofluorescence assay to characterize and quantify mammalian stress granules

This video demonstrates an assay for characterizing and quantifying mammalian stress granules, which consist of mRNAs, RNA-binding proteins (RBPs), and various other...

An Immunofluorescence Assay to Characterize and Quantify Mammalian Stress Granules

automated detection and analysis of exocytosis

Automated Detection and Analysis of Exocytosis

We developed automated computer vision software to detect exocytic events marked by pH-sensitive fluorescent probes. Here, we demonstrate the use of a graphical user interface and RStudio to detect fusion events, analyze and display spatiotemporal parameters of fusion, and classify events into distinct fusion...

use of arabidopsis eceriferum mutants to explore plant cuticle biosynthesis

Use of Arabidopsis eceriferum Mutants to Explore Plant Cuticle Biosynthesis

The plant cuticle is a waxy outer covering on plants that has a primary role in water conservation but is also an important barrier against the entry of pathogenic microorganisms.   In this video, we demonstrate the analysis of plant cuticle mutants identified by forward and reverse genetics...

biosynthesis of a flavonol from a flavanone by establishing a one-pot bienzymatic cascade

Biosynthesis of a Flavonol from a Flavanone by Establishing a One-pot Bienzymatic Cascade

The derivation of a flavonol is crucial for its application in healthcare and the food industry. Here, we provide a detailed protocol for the biosynthesis of a flavonol from a flavanone and discuss the crucial steps and its advantages over other...

confocal imaging of neuropeptide y-phluorin: a technique to visualize insulin granule exocytosis in intact murine and human islets

Confocal Imaging of Neuropeptide Y-pHluorin: A Technique to Visualize Insulin Granule Exocytosis in Intact Murine and Human Islets

We describe a protocol for visualization of insulin exocytosis in intact islets using pHluorin, a pH-sensitive green fluorescent protein. Isolated islets are infected with adenovirus encoding pHluorin coupled to the vesicle cargo neuropeptide Y. This allows for the detection of insulin granule fusion events by confocal...

a microplate assay to assess chemical effects on rbl-2h3 mast cell degranulation: effects of triclosan without use of an organic solvent

A Microplate Assay to Assess Chemical Effects on RBL-2H3 Mast Cell Degranulation: Effects of Triclosan without Use of an Organic Solvent

Mast cell degranulation, the release of allergic mediators, is important in allergy, asthma, and parasite defense. Here we demonstrate techniques1 for assessing effects of drugs and toxicants on degranulation, methodology recently utilized to exhibit the powerful inhibitory effect of antibacterial agent...

quantifying spatiotemporal parameters of cellular exocytosis in micropatterned cells

Quantifying Spatiotemporal Parameters of Cellular Exocytosis in Micropatterned Cells

Live imaging of lysosomal exocytosis on micropatterned cells allows a spatial quantification of this process. Morphology normalization using micropatterns is an outstanding tool to uncover general rules about the spatial distribution of cellular...

Clinical Application of Sleeping Beauty and Artificial Antigen Presenting Cells to Genetically Modify T Cells from Peripheral and Umbilical Cord Blood

The potency of clinical-grade T cells can be improved by combining gene therapy with immunotherapy to engineer a biologic product with the potential for superior (i) recognition of tumor-associated antigens (TAAs), (ii) persistence after infusion, (iii) potential for migration to tumor sites, and (iv) ability to recycle effector functions within the tumor microenvironment. Most approaches to genetic manipulation of T cells engineered for human application have used retrovirus and lentivirus for the stable expression of CAR1-3. This approach, although compliant with current good manufacturing practice (GMP), can be expensive as it relies on the manufacture and release of clinical-grade recombinant virus from a limited number of production facilities. The electro-transfer of nonviral plasmids is an appealing alternative to transduction since DNA species can be produced to clinical grade at approximately 1/10th the cost of recombinant GMP-grade virus. To improve the efficiency of integration we adapted Sleeping Beauty (SB) transposon and transposase for human application4-8. Our SB system uses two DNA plasmids that consist of a transposon coding for a gene of interest (e.g. 2nd generation CD19-specific CAR transgene, designated CD19RCD28) and a transposase (e.g. SB11) which inserts the transgene into TA dinucleotide repeats9-11. To generate clinically-sufficient numbers of genetically modified T cells we use K562-derived artificial antigen presenting cells (aAPC) (clone #4) modified to express a TAA (e.g. CD19) as well as the T cell costimulatory molecules CD86, CD137L, a membrane-bound version of interleukin (IL)-15 (peptide fused to modified IgG4 Fc region) and CD64 (Fc-&gamma; receptor 1) for the loading of monoclonal antibodies (mAb)12. In this report, we demonstrate the procedures that can be undertaken in compliance with cGMP to generate CD19-specific CAR+ T cells suitable for human application. This was achieved by the synchronous electro-transfer of two DNA plasmids, a SB transposon (CD19RCD28) and a SB transposase (SB11) followed by retrieval of stable integrants by the every-7-day additions (stimulation cycle) of &gamma;-irradiated aAPC (clone #4) in the presence of soluble recombinant human IL-2 and IL-2113. Typically 4 cycles (28 days of continuous culture) are undertaken to generate clinically-appealing numbers of T cells that stably express the CAR. This methodology to manufacturing clinical-grade CD19-specific T cells can be applied to T cells derived from peripheral blood (PB) or umbilical cord blood (UCB). Furthermore, this approach can be harnessed to generate T cells to diverse tumor types by pairing the specificity of the introduced CAR with expression of the TAA, recognized by the CAR, on the aAPC.

Clinical Application of Sleeping Beauty and Artificial Antigen Presenting Cells to Genetically Modify T Cells from Peripheral and Umbilical Cord Blood

T cells expressing a CD19-specific chimeric antigen receptor (CAR) are infused as investigational treatment of B-cell malignancies in our first-in-human gene therapy trials. We describe genetic modification of T cells using the Sleeping Beauty (SB) system to introduce CD19-specific CAR and selective propagation on designer CD19+ artificial antigen presenting cells.

The potency of clinical-grade T cells can be improved by combining gene therapy with immunotherapy to engineer  a biologic product with the potential for ...

Isolation of Precursor B-cell Subsets from Umbilical Cord Blood

Umbilical cord blood is highly enriched for hematopoietic progenitor cells at different lineage commitment stages. We have developed a protocol for isolating precursor B-cells at four different stages of differentiation. Because genes are expressed and epigenetic modifications occur in a tissue specific manner, it is vital to discriminate between tissues and cell types in order to be able to identify alterations in the genome and the epigenome that may lead to the development of disease. This method can be adapted to any type of cell present in umbilical cord blood at any stage of differentiation.	
This method comprises 4 main steps. First, mononuclear cells are separated by density centrifugation. Second, B-cells are enriched using biotin conjugated antibodies that recognize and remove non B-cells from the mononuclear cells. Third the B-cells are fluorescently labeled with cell surface protein antibodies specific to individual stages of B-cell development. Finally, the fluorescently labeled cells are sorted and individual populations are recovered. The recovered cells are of sufficient quantity and quality to be utilized in downstream nucleic acid assays.

Here we describe a protocol for isolating subsets of precursor B-cells from umbilical cord blood. A sufficient quantity and quality of nucleic acids may be extracted from the cells and used in subsequent assays utilizing DNA or RNA.

Umbilical cord blood is highly enriched for hematopoietic progenitor cells at different lineage commitment stages. We have developed a protocol for ...

Mast cells play important roles in allergic disease and immune defense against parasites. Once activated (e.g. by an allergen), they degranulate, a process that results in the exocytosis of allergic mediators. Modulation of mast cell degranulation by drugs and toxicants may have positive or adverse effects on human health. Mast cell function has been dissected in detail with the use of rat basophilic leukemia mast cells (RBL-2H3), a widely accepted model of human mucosal mast cells3-5. Mast cell granule component and the allergic mediator &#946;-hexosaminidase, which is released linearly in tandem with histamine from mast cells6, can easily and reliably be measured through reaction with a fluorogenic substrate, yielding measurable fluorescence intensity in a microplate assay that is amenable to high-throughput studies1. Originally published by Naal et al.1, we have adapted this degranulation assay for the screening of drugs and toxicants and demonstrate its use here.
Triclosan is a broad-spectrum antibacterial agent that is present in many consumer products and has been found to be a therapeutic aid in human allergic skin disease7-11, although the mechanism for this effect is unknown. Here we demonstrate an assay for the effect of triclosan on mast cell degranulation. We recently showed that triclosan strongly affects mast cell function2. In an effort to avoid use of an organic solvent, triclosan is dissolved directly into aqueous buffer with heat and stirring, and resultant concentration is confirmed using UV-Vis spectrophotometry (using &#949;280 = 4,200 L/M/cm)12. This protocol has the potential to be used with a variety of chemicals to determine their effects on mast cell degranulation, and more broadly, their allergic potential.

Mast cell degranulation, the release of allergic mediators, is important in allergy, asthma, and parasite defense. Here we demonstrate techniques1 for assessing effects of drugs and toxicants on degranulation, methodology recently utilized to exhibit the powerful inhibitory effect of antibacterial agent triclosan2.

Mast cells play important roles in allergic disease and immune defense against parasites. Once activated (e.g. by an allergen), they degranulate, a ...

Visualizing Non-lytic Exocytosis of Cryptococcus neoformans from Macrophages Using Digital Light Microscopy

Many aspects of the infection of macrophages by Cryptococcus neoformans have been extensively studied and well defined. However, one particular interaction that is not clearly understood is non-lytic exocytosis. In this process, yeast cells are released into the extracellular space by a poorly understood mechanism that leaves both the macrophage and Cn viable. Here, we describe how to follow a large number of individually infected macrophages for a 24 hr infection period by time-lapsed microscopy. Infected macrophages are housed in a heating chamber with a CO2 atmosphere attached to a microscope that provides the same conditions as a cell-culture incubator. Live digital microscopy can provide information about the dynamic interactions between a host and pathogen that is not available from static images. Being able to visualize each infected cell can provide clues as to how macrophages handle fungal infections, and vice versa. This technique is a powerful tool in studying the dynamics that are behind a complex phenomenon.

Visualizing Non-lytic Exocytosis of Cryptococcus neoformans from Macrophages Using Digital Light Microscopy

We describe how to visualize macrophage-C. neoformans (Cn) interactions in real time, with specific emphasis on the process of non-lytic exocytosis using digital light microscopy. Using this technique individually infected macrophages can be studied to ascertain various aspects of this phenomenon.

Many aspects of the infection of macrophages by Cryptococcus neoformans have been extensively studied and well defined. However, one particular ...

Mast cells (MCs) are hematopoietic cells which reside in various tissues, and are especially abundant at sites exposed to the external environment, such as skin, airways and gastrointestinal tract. Best known for their detrimental role in IgE-dependent allergic reactions, MCs have also emerged as important players in host defense against venom and invading bacteria and parasites. MC phenotype and function can be influenced by microenvironmental factors that may differ according to anatomic location and/or based on the type or stage of development of immune responses. For this reason, we and others have favored in vivo approaches over in vitro methods to gain insight into MC functions. Here, we describe methods for the generation of mouse bone marrow-derived cultured MCs (BMCMCs), their adoptive transfer into genetically MC-deficient mice, and the analysis of the numbers and distribution of adoptively transferred MCs at different anatomical sites. This method, named the &#8216;mast cell knock-in&#8217; approach, has been extensively used over the past 30 years to assess the functions of MCs and MC-derived products in vivo. We discuss the advantages and limitations of this method, in light of alternative approaches that have been developed in recent years.

We describe a method for the generation of in vitro derived mast cells, their engraftment into mast cell-deficient mice, and the analysis of the phenotype, numbers and distribution of engrafted mast cells at different anatomical sites. This protocol can be used to assess the functions of mast cells in vivo.

Mast cells (MCs) are hematopoietic cells which reside in various tissues, and are especially abundant at sites exposed to the external environment, such ...

Overexpression and Purification of Human Cis-prenyltransferase in Escherichia coli

Prenyltransferases (PT) are a group of enzymes that catalyze chain elongation of allylic diphosphate using isopentenyl diphosphate (IPP) via multiple condensation reactions. DHDDS (dehydrodolichyl diphosphate synthase) is a eukaryotic long-chain cis-PT (forming cis double bonds from the condensation reaction) that catalyzes chain elongation of farnesyl diphosphate (FPP, an allylic diphosphate) via multiple condensations with isopentenyl diphosphate (IPP). DHDDS is of biomedical importance, as a non-conservative mutation (K42E) in the enzyme results in retinitis pigmentosa, ultimately leading to blindness. Therefore, the present protocol was developed in order to acquire large quantities of purified DHDDS, suitable for mechanistic studies. Here, the usage of protein fusion, optimized culture conditions and codon-optimization were used to allow the overexpression and purification of functionally active human DHDDS in E. coli. The described protocol is simple, cost-effective and time sparing. The homology of cis-PT among different species suggests that this protocol may be applied for other eukaryotic cis-PT as well, such as those involved in natural rubber synthesis.

Overexpression and Purification of Human Cis-prenyltransferase in Escherichia coli

A simple protocol for overexpression and purification of codon-optimized, human cis-prenyltransferase, under non-denaturing conditions, from Escherichia coli, is described, along with an enzymatic activity assay. This protocol can be generalized for production of other cis- prenyltransferase proteins in quantity and quality suitable for mechanistic studies.

Prenyltransferases (PT) are a group of enzymes that catalyze chain elongation of allylic diphosphate using isopentenyl diphosphate (IPP) via multiple ...

Isolation of Peritoneum-derived Mast Cells and Their Functional Characterization with Ca2+-imaging and Degranulation Assays

Mast cells (MCs), as a part of the immune system, play a key role in defending the host against several pathogens and in the initiation of the allergic immune response. The activation of MCs via the cross-linking of surface IgE bound to high affinity IgE receptor (Fc&#949;RI), as well as through the stimulation of several other receptors, initiates the rise of the free intracellular Ca2+ level ([Ca2+]i) that promotes the release of inflammatory and allergic mediators. The identification of molecular constituents involved in these signaling pathways is crucial for understanding the regulation of MC function. In this article, we describe a protocol for the isolation of murine connective tissue type MCs by peritoneal lavage and cultivation of peritoneal MCs (PMCs). Cultures of MCs from various knockout mouse models by this methodology represent a useful approach to the identification of proteins involved in MC signaling pathways. In addition, we also describe a protocol for single cell Fura-2 imaging as an important technique for the quantification of Ca2+ signaling in MCs. Fluorescence-based monitoring of [Ca2+]i is a reliable and commonly used approach to study Ca2+ signaling events, including store-operated calcium entry, which is of utmost importance for MC activation. For the analysis of MC degranulation, we describe a &#946;-hexosaminidase release assay. The amount of &#946;-hexosaminidase released into the culture medium is considered as a degranulation marker for all three different secretory subsets described in MCs. &#946;-hexosaminidase can easily be quantified by its reaction with a colorigenic substrate in a microtiter plate colorimetric assay. This highly reproducible technique is cost-effective and requires no specialized equipment. Overall, the provided protocol demonstrates a high yield of MCs expressing typical MC surface markers, displaying typical morphological and phenotypic features of MCs, and demonstrating highly reproducible responses to secretagogues in Ca2+-imaging and degranulation assays.

Isolation of Peritoneum-derived Mast Cells and Their Functional Characterization with Ca2+-imaging and Degranulation Assays

Here, we present a protocol to isolate and cultivate murine peritoneal mast cells. We also describe two protocols for their functional characterization: a fluorescent imaging of intracellular free Ca2+ concentration and a degranulation assay based on colorimetric quantification of the released &#946;-hexosaminidase.

Mast cells (MCs), as a part of the immune system, play a key role in defending the host against several pathogens and in the initiation of the allergic ...

Investigating Aortic Valve Calcification via Isolation and Culture of T Lymphocytes using Feeder Cells from Irradiated Buffy Coat

Calcific aortic valve disease (CAVD), an active disease process ranging from mild thickening of the valve to severe calcification, is associated with high mortality, despite new therapeutic options such as transcatheter aortic valve replacement (TAVR). 
The complete pathways that start with valve calcification and lead to severe aortic stenosis remain only partly understood. By providing a close representation of the aortic valve cells in vivo, the assaying of T lymphocytes from stenotic valve tissue could be an efficient way to clarify their role in the development of calcification. After surgical excision, the fresh aortic valve sample is dissected in small pieces and the T lymphocytes are cultured, cloned then analyzed using fluorescence activated cell sorting (FACS).
The staining procedure is simple and the stained tubes can also be fixed using 0.5% of paraformaldehyde and analyzed up to 15 days later. The results generated from the staining panel can be used to track changes in T cell concentrations over time in relation to intervention and could easily be further developed to assess activation states of specific T cell subtypes of interest. In this study, we show the isolation of T cells, performed on fresh calcified aortic valve samples and the steps of analyzing T cell clones using flow cytometry to further understand the role of adaptive immunity in CAVD pathophysiology.

In this study, we describe the process of T lymphocyte isolation from fresh samples of calcified aortic valves and the analytical steps of T cell-cloning for the characterization of the adaptive leukocyte subsets by using flow cytometry analysis.

Calcific aortic valve disease (CAVD), an active disease process ranging from mild thickening of the valve to severe calcification, is associated with high ...

Double Labeling Immunofluorescence using Antibodies from the Same Species to Study Host-Pathogen Interactions

Nowadays, it is possible to find a wide range of molecular tools available to study parasite-host cell interactions. However, some limitations exist to obtain commercial monoclonal or polyclonal antibodies that recognize specific cell structures and proteins in parasites. Besides, there are few commercial antibodies available to label trypanosomatids. Usually, polyclonal antibodies against parasites are prepared in-house and could be more challenging to use in combination with other antibodies produced in the same species. Here, the protocol demonstrates how to use polyclonal and monoclonal antibodies raised in the same species to perform double labeling immunofluorescence to study host cell and pathogen interactions. To achieve the double labeling immunofluorescence, it is crucial to incubate first the mouse polyclonal antibody and then follow the incubation with the secondary mouse IgG antibody conjugated to any fluorochrome. After that, an additional blocking step is necessary to prevent any trace of the primary antibody from being recognized by the next secondary antibody. Then, a mouse monoclonal antibody and its specific IgG subclass secondary antibody conjugated to a different fluorochrome are added to the sample at the appropriate times. Additionally, it is possible to perform triple labeling immunofluorescence using a third antibody raised in a different species. Also, structures such as nuclei and actin can be stained subsequently with their specific compounds or labels. Thus, these approaches presented here can be adjusted for any cell whose sources of primary antibodies are limited.

Here, the protocol describes how to perform double labeling immunofluorescence using primary antibodies raised in the same species to study host-pathogen interactions. Also, it can include the third antibody from a different host in this protocol. This approach can be made in any cell type and pathogens.

Nowadays, it is possible to find a wide range of molecular tools available to study parasite-host cell interactions. However, some limitations exist to ...

Investigating the Phagocytosis of Leishmania using Confocal Microscopy

Phagocytosis is an orchestrated process that involves distinct steps: recognition, binding, and internalization. Professional phagocytes take up Leishmania parasites by phagocytosis, consisting of recognizing ligands on parasite surfaces by multiple host cell receptors. Binding of Leishmania to macrophage membranes occurs through complement receptor type 1 (CR1) and complement receptor type 3 (CR3) and Pattern Recognition Receptors. Lipophosphoglycan (LPG) and 63 kDa glycoprotein (gp63) are the main ligands involved in macrophage-Leishmania interactions. Following the initial recognition of parasite ligands by host cell receptors, parasites become internalized, survive, and multiply within parasitophorous vacuoles. The maturation process of Leishmania-induced vacuoles involves the acquisition of molecules from intracellular vesicles, including monomeric G protein Rab 5 and Rab 7, lysosomal associated membrane protein 1 (LAMP-1), lysosomal associated membrane protein 2 (LAMP-2), and microtubule-associated protein 1A/1B-light chain 3 (LC3).
Here, we describe methods to evaluate the early events occurring during Leishmania interaction with the host cells using confocal microscopy, including (i) binding (ii) internalization, and (iii) phagosome maturation. By adding to the body of knowledge surrounding these determinants of infection outcome, we hope to improve the understanding of the pathogenesis of Leishmania infection and support the eventual search for novel chemotherapeutic targets.

Investigating the Phagocytosis of Leishmania using Confocal Microscopy

The mechanism associated with phagocytosis in Leishmania infection remains poorly understood. Here, we describe methods to evaluate the early events occurring during Leishmania interaction with the host cells.