This work was supported by NIH/NIAID grant AI45889 to S.A.P. Flow cytometry studies were carried out using FACS core facilities supported by the Einstein Cancer Center (NIH/NCI CA013330) and Center for AIDS Research (NIH/NIAID AI51519).

Animal experiments are done in accordance with approved guidelines from the institutional animal care and usage committee (IACUC). All procedures requiring sterility are performed in a biosafety cabinet.
1. Implantation of B16.Flt3L Melanoma in Mice
<ol>
	<li>Culture the Flt-3 expressing B16 melanoma cell line in T25 tissue culture flasks at a density of 0.5 x 106 cells/ml&#160;in complete DMEM medium with 10% CO2 at 37 &#176;C. Grow until the cells reach ~90% confluenc...

<ol>
	<li>Steinman, R. M., Cohn, Z. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+of+a+novel+cell+type+in+peripheral+lymphoid+organs+of+mice.+I.+Morphology,+quantitation,+tissue+distribution.">Identification of a novel cell type in peripheral lymphoid organs of mice. I. Morphology, quantitation, tissue distribution.</a> J Exp Med. 137 (5), 1142-1162 (1973).</li><li>Banchereau, J., Steinman, R. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dendritic+cells+and+the+control+of+immunity.">Dendritic cells and the control of immunity.</a> Nature. 392 (6673), 245-252 (1998).</li><li>Dudziak, 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=Differential+antigen+processing+by+dendritic+cell+subsets+in+vivo.">Differential antigen processing by dendritic cell subsets in vivo.</a> Science. 315 (5808), 107-111 (2007).</li><li>Belz, G. T., Nutt, S. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Transcriptional+programming+of+the+dendritic+cell+network.">Transcriptional programming of the dendritic cell network.</a> Nat Rev Immunol. 12 (2), 101-113 (2012).</li><li>den Haan, J. M., Bevan, M. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Constitutive+versus+activation-dependent+cross-presentation+of+immune+complexes+by+CD8(+)+and+CD8(-)+dendritic+cells+in+vivo.">Constitutive versus activation-dependent cross-presentation of immune complexes by CD8(+) and CD8(-) dendritic cells in vivo.</a> J Exp Med. 196 (6), 817-827 (2002).</li><li>Carbone, F. R., Kurts, C., Bennett, S. R., Miller, J. F., Heath, W. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cross-presentation:+a+general+mechanism+for+CTL+immunity+and+tolerance.">Cross-presentation: a general mechanism for CTL immunity and tolerance.</a> Immunol Today. 19 (8), 368-373 (1998).</li><li>Yamazaki, 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=CD8++CD205++splenic+dendritic+cells+are+specialized+to+induce+Foxp3++regulatory+T+cells.">CD8+ CD205+ splenic dendritic cells are specialized to induce Foxp3+ regulatory T cells.</a> J Immunol. 181 (10), 6923-6933 (2008).</li><li>Mukherjee, G., 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=DEC-205-mediated+antigen+targeting+to+steady-state+dendritic+cells+induces+deletion+of+diabetogenic+CD8(+)+T+cells+independently+of+PD-1+and+PD-L1.">DEC-205-mediated antigen targeting to steady-state dendritic cells induces deletion of diabetogenic CD8(+) T cells independently of PD-1 and PD-L1.</a> Int Immunol. 25 (11), 651-660 (2013).</li><li>Melief, C. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mini-review:+Regulation+of+cytotoxic+T+lymphocyte+responses+by+dendritic+cells:+peaceful+coexistence+of+cross-priming+and+direct+priming.">Mini-review: Regulation of cytotoxic T lymphocyte responses by dendritic cells: peaceful coexistence of cross-priming and direct priming.</a> Eur J Immunol. 33 (10), 2645-2654 (2003).</li><li>Bendelac, A., Savage, P. B., Teyton, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+biology+of+NKT+cells.">The biology of NKT cells.</a> Annu Rev Immunol. 25, 297-336 (2007).</li><li>Benlagha, K., Bendelac, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=CD1d-restricted+mouse+V+alpha+14+and+human+V+alpha+24+T+cells:+lymphocytes+of+innate+immunity.">CD1d-restricted mouse V alpha 14 and human V alpha 24 T cells: lymphocytes of innate immunity.</a> Semin Immunol. 12 (6), 537-542 (2000).</li><li>Brennan, P. J., Brigl, M., Brenner, M. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Invariant+natural+killer+T+cells:+an+innate+activation+scheme+linked+to+diverse+effector+functions.">Invariant natural killer T cells: an innate activation scheme linked to diverse effector functions.</a> Nature reviews. Immunology. 13 (2), 101-117 (2013).</li><li>Arora, 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=A+single+subset+of+dendritic+cells+controls+the+cytokine+bias+of+natural+killer+T+cell+responses+to+diverse+glycolipid+antigens.">A single subset of dendritic cells controls the cytokine bias of natural killer T cell responses to diverse glycolipid antigens.</a> Immunity. 40 (1), 105-116 (2014).</li><li>Semmling, V., 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=Alternative+cross-priming+through+CCL17-CCR4-mediated+attraction+of+CTLs+toward+NKT+cell-licensed+DCs.">Alternative cross-priming through CCL17-CCR4-mediated attraction of CTLs toward NKT cell-licensed DCs.</a> Nat Immunol. 11 (4), 313-320 (2010).</li><li>Duriancik, D. M., Hoag, K. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+identification+and+enumeration+of+dendritic+cell+populations+from+individual+mouse+spleen+and+Peyer's+patches+using+flow+cytometric+analysis.">The identification and enumeration of dendritic cell populations from individual mouse spleen and Peyer's patches using flow cytometric analysis.</a> Cytometry A. 75 (11), 951-959 (2009).</li><li>Karsunky, H., Merad, M., Cozzio, A., Weissman, I. L., Manz, M. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Flt3+ligand+regulates+dendritic+cell+development+from+Flt3++lymphoid+and+myeloid-committed+progenitors+to+Flt3++dendritic+cells+in+vivo.">Flt3 ligand regulates dendritic cell development from Flt3+ lymphoid and myeloid-committed progenitors to Flt3+ dendritic cells in vivo.</a> J Exp Med. 198 (2), 305-313 (2003).</li><li>Mach, N., 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=Differences+in+dendritic+cells+stimulated+in+vivo+by+tumors+engineered+to+secrete+granulocyte-macrophage+colony-stimulating+factor+or+Flt3-ligand.">Differences in dendritic cells stimulated in vivo by tumors engineered to secrete granulocyte-macrophage colony-stimulating factor or Flt3-ligand.</a> Cancer Res. 60 (12), 3239-3246 (2000).</li><li>Vremec, D., Segura, 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+purification+of+large+numbers+of+antigen+presenting+dendritic+cells+from+mouse+spleen.">The purification of large numbers of antigen presenting dendritic cells from mouse spleen.</a> Methods Mol Biol. 960, 327-350 (2013).</li><li>Machholz, E., Mulder, G., Ruiz, C., Corning, B. F., Pritchett-Corning, K. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Manual+restraint+and+common+compound+administration+routes+in+mice+and+rats.">Manual restraint and common compound administration routes in mice and rats.</a> J Vis Exp. (67), (2012).</li><li>Reeves, J. P., Reeves, P. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Unit+1.9,+Removal+of+lymphoid+organs.">Unit 1.9, Removal of lymphoid organs.</a> Curr Protoc Immunol. , (2001).</li><li>Strober, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Appendix+3B,+Trypan+blue+exclusion+test+of+cell+viability.">Appendix 3B, Trypan blue exclusion test of cell viability.</a> Curr Protoc Immunol. , (2001).</li><li>Vremec, 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=Maintaining+dendritic+cell+viability+in+culture.">Maintaining dendritic cell viability in culture.</a> Mol Immunol. 63 (2), 264-267 (2015).</li></ol>

Dendritic cells are accepted to be the major professional antigen presenting cells involved in the priming of T cell responses. Their main function is to survey the tissue microenvironment by taking up and processing antigens for presentation to T cells. In order to study the function of specific DC subsets, these need to be isolated in sufficient numbers using an approach that maintains their normal phenotype and functions. Most protocols rely on the isolation of specific DC subset from na&#239;ve mice. Since these cell...

Dendritic cells (DC) were discovered almost forty years ago as the &#34;large stellate (Greek dendron) cell&#34; found in lymphoid organs1. Many studies have shown that DCs are the only antigen presenting cells that can effectively stimulate na&#239;ve T cells2. A major function of these cells is the uptake and presentation of antigens and their efficient processing and loading of these onto antigen presenting molecules. In mouse spleen, DCs can be separated into plasmacytoid and conventional subsets. The plasmacytoid DCs are characterized by low expression of CD11c and high levels of B220 and Gr-1. They are also positive for the surface marker mPDCA1 and secrete type I interferon in response to toll like receptor 9 (TLR9) ligands. The conventional DCs are high for CD11c and MHC class II expression. They can be split into three distinct subsets based on the surface expression of phenotypic markers such as CD4, CD8&#945;, DEC205, CD11b and dendritic cell inhibitory receptor 2 (DCIR2, recognized by the 33D1 antibody) proteins 3,4. The CD8&#945;Pos DCs are also known as cDC1, are positive for DEC205, but negative for myeloid markers such as CD11b and 33D1. The CD8&#945;Neg DCs, also called cDC2, are positive for 33D1, CD11b and CD4 but lack DEC205. The double negative subset (i.e., negative for both CD4 and CD8&#945;) is relatively rare, and is negative for DEC205 and 33D1. It is the least characterized subset and may be a less differentiated form of CD8&#945;Neg DC.
Phenotypic differences in the various DC subsets also extend to their in vivo functions. The CD8&#945;Neg DCs are highly phagocytic and are thought to present exogenous antigen mainly&#160;via MHC class II to CD4 T cells 3. In contrast, the CD8&#945;Pos DCs are specialized for presentation of soluble protein antigen on MHC class I in a mechanism called cross-presentation. The outcome of cross-presentation depends on the activation status of these DCs5, and can either lead to expansion of cytotoxic T cells (CTLs) or development of regulatory T cells 62,7. Targeting of antigen to CD8&#945;Pos&#160;DCs&#160;using anti-DEC205-antibody-mediated delivery results largely in the deletion of T cells8, whereas presentation of antigens derived from infected apoptotic cells induces a strong CTL response 9.
In addition to recognition of peptide antigens, the mammalian immune system has evolved to recognize lipid and glycolipid antigens. These antigens are presented by CD1 molecules, which are MHC class I-like cell surface proteins that exist in multiple related forms in various mammals. In mice, a single type of highly conserved CD1 molecule called CD1d is responsible for presentation of glycolipid antigens 10. The major population of T cells that recognize CD1d/glycolipid complexes is called invariant NKT cells (iNKT cells). These cells express a semi-invariant T cell receptor (TCR) composed of an invariant TCR&#945; chain that is paired with TCR&#946; chains that have limited diversity 11. Unlike conventional T cells that need to proliferate and differentiate to become activated effector T cells, iNKT cells exist as an effector population and start responding rapidly after glycolipid administration 12. Identification of physiologically relevant lipid antigen presenting cells is an active area of research, and several distinct cell types such as B cells, macrophages and DCs have been suggested to perform this function. However, it was demonstrated that the CD8&#945;Pos subset of DCs is the primary cell mediating uptake and presentation of lipid antigens to mouse iNKT cells 13 and glycolipid mediated cross-priming of CD8 T cells 14.
To compare the efficiency of antigen presentation by different antigen presenting cells, a straightforward approach is to transfer different types of purified APCs pulsed with equivalent amounts of antigen into na&#239;ve hosts. Cell transfer experiments of this type are often performed for immunological studies. However, performing transfer studies with ex vivo antigen treated DCs is challenging, since these cells exist as rare populations in lymphoid organs where they constitute less than 2% of total cells15. It is therefore necessary to enhance the development of these cells in donor animals to increase the efficiency of isolation protocols.
It is known that the common lymphoid and common myeloid progenitors, which are required for generation of pDC, CD8Pos and CD8Neg DC subsets, express fms-related receptor tyrosine kinase 3 (Flt-3). Upon in vivo Flt-3 ligand (Flt-3L) administration, emigration of Flt-3 expressing progenitor cells from bone marrow is increased, resulting in the increased seeding of peripheral lymphoid organs and the expansion of their mature DC progeny16. Expression of Flt-3 is lost during commitment to the B, T or NK cell differentiation pathways. Therefore, only minimal alterations are observed in these cells upon Flt-3L administration. Similar expansion in DC populations is observed in mice bearing tumors generated by implantation of a B16-melanoma cell line secreting murine Flt-3L, which provides a simple and economical method for providing sustained systemic levels of Flt-3L17,18. Using this approach, we have developed a protocol based on the implantation of B16-melanoma cells secreting Flt-3L to stimulate the expansion of all normal DC subsets in mouse spleen, thus greatly increasing the yields of these cells that can be isolated for subsequent experiments. We consistently find that within 10 - 14 days following subcutaneous implantation of the Flt-3 secreting tumor, mice develop splenomegaly with marked enrichment of DCs to constitute 40 - 60% of total spleen cells. From these spleens, different DC subsets can be isolated with high purity using standard commercially available cell purification kits that employ subset-specific phenotypic markers.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>0.05% Trypsin-EDTA&#160;</td>
			<td>Life Technologies, Gibco</td>
			<td>25300-054</td>
			<td></td>
		</tr>
		<tr>
			<td>Isoflurane&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>CDS019936-250MG</td>
			<td></td>
		</tr>
		<tr>
			<td>Collagenase D&#160;</td>
			<td>Roche Diagnostics</td>
			<td>11088858001</td>
			<td></td>
		</tr>
		<tr>
			<td>DNase I (dry powder)</td>
			<td>QIAGEN</td>
			<td>79254</td>
			<td></td>
		</tr>
		<tr>
			<td>200 proof ethanol&#160;</td>
			<td>Thermo Fisher Scientific</td>
			<td>9-6705-004-220</td>
			<td>Used to prepare 70% ethanol</td>
		</tr>
		<tr>
			<td>RBC lysis buffer</td>
			<td>Sigma-Aldrich</td>
			<td>R7757</td>
			<td></td>
		</tr>
		<tr>
			<td>RPMI-1640 medium with L-glutamine&#160;</td>
			<td>Life Technologies, Gibco</td>
			<td>11875-119</td>
			<td></td>
		</tr>
		<tr>
			<td>DMEM medium with L-glutamine&#160;</td>
			<td>Life Technologies, Gibco</td>
			<td>11995-073</td>
			<td></td>
		</tr>
		<tr>
			<td>200 mM L-glutamine&#160;</td>
			<td>Life Technologies</td>
			<td>25030081</td>
			<td></td>
		</tr>
		<tr>
			<td>MEM non-essential amino acids&#160;</td>
			<td>Life Technologies, Gibco</td>
			<td>11140-050</td>
			<td></td>
		</tr>
		<tr>
			<td>MEM essential amino acids&#160;</td>
			<td>Life Technologies</td>
			<td>11130-051&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>&#946;-mercaptoethanol&#160;</td>
			<td>Life Technologies, Invitrogen</td>
			<td>21985-023</td>
			<td></td>
		</tr>
		<tr>
			<td>Sodium pyruvate&#160;</td>
			<td>Life Technologies</td>
			<td>11360-070</td>
			<td></td>
		</tr>
		<tr>
			<td>HEPES&#160;</td>
			<td>Life Technologies, Invitrogen</td>
			<td>15630</td>
			<td></td>
		</tr>
		<tr>
			<td>Phosphate buffered saline (PBS Ca2+ and Mg2+ free pH 7.2)</td>
			<td>Life Technologies, Invitrogen</td>
			<td>20012-050</td>
			<td></td>
		</tr>
		<tr>
			<td>Dulbecco&#8217;s PBS (DPBS with Ca2+ and Mg2+)</td>
			<td>Life Technologies, Gibco</td>
			<td>14040-182</td>
			<td></td>
		</tr>
		<tr>
			<td>0.5 M Ethylenediaminetetraacetate (EDTA) solution&#160;</td>
			<td>Life Technologies</td>
			<td>15575-020</td>
			<td></td>
		</tr>
		<tr>
			<td>Bovine serum albumin (BSA)&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>A2153</td>
			<td></td>
		</tr>
		<tr>
			<td>Fetal calf serum</td>
			<td>Atlanta Biologicals</td>
			<td>S11050&#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin/streptomycin&#160;</td>
			<td>Life Technologies, Invitrogen</td>
			<td>15140-163</td>
			<td></td>
		</tr>
		<tr>
			<td>Trypan blue (dry powder)&#160;</td>
			<td>Sigma-Aldrich</td>
			<td>T6146-5G&#160;</td>
			<td>Prepare 0.08% with PBS</td>
		</tr>
		<tr>
			<td>Plasmacytoid Dendritic Cell Isolation Kit II, mouse</td>
			<td>Miltenyi Biotech</td>
			<td>130-092-786</td>
			<td></td>
		</tr>
		<tr>
			<td>Magnetic beads conjugated with anti-mouse CD11c&#160;</td>
			<td>Miltenyi Biotech</td>
			<td>130-152-001</td>
			<td></td>
		</tr>
		<tr>
			<td>CD8&#945;Pos mouse DC isolation kit&#160;</td>
			<td>Miltenyi Biotech</td>
			<td>130-091-169</td>
			<td></td>
		</tr>
		<tr>
			<td>Fc-gamma receptor blocking antibody (Clone 2.4G2)</td>
			<td>BD Biosciences</td>
			<td>553141</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-mouse CD11c-FITC&#160;</td>
			<td>BD Biosciences</td>
			<td>553801</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-mouse CD8&#945;-PerCP&#160;</td>
			<td>BD Biosciences</td>
			<td>553036</td>
			<td></td>
		</tr>
		<tr>
			<td>Anti-mouse B220-PE&#160;</td>
			<td>BD Biosciences</td>
			<td>553090</td>
			<td></td>
		</tr>
		<tr>
			<td>1 ml syringes&#160;</td>
			<td>BD</td>
			<td>26048</td>
			<td></td>
		</tr>
		<tr>
			<td>23 G1 needle&#160;</td>
			<td>BD</td>
			<td>305145</td>
			<td></td>
		</tr>
		<tr>
			<td>100 mm Petri dishes&#160;</td>
			<td>Thermo Fisher Scientific</td>
			<td>875712</td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical instruments&#160;</td>
			<td>Kent Scientific</td>
			<td>INSMOUSEKIT</td>
			<td></td>
		</tr>
		<tr>
			<td>Cell strainer (70 &#181;m&#160;</td>
			<td>BD</td>
			<td>352350</td>
			<td></td>
		</tr>
		<tr>
			<td>Large Petri plates&#160;</td>
			<td>Thermo Fisher Scientific</td>
			<td>FB0875712</td>
			<td></td>
		</tr>
		<tr>
			<td>Vacuum filtration system (500 ml(0.22 um&#160;</td>
			<td>Corning</td>
			<td>431097</td>
			<td></td>
		</tr>
		<tr>
			<td>LS columns&#160;</td>
			<td>Miltenyi</td>
			<td>130-042-401</td>
			<td></td>
		</tr>
		<tr>
			<td>Magnetic stand MACS separator&#160;</td>
			<td>Miltenyi Biotec</td>
			<td>130-042-302</td>
			<td></td>
		</tr>
		<tr>
			<td>Wide-bore 200 &#956;l pipette tips&#160;</td>
			<td>PerkinElmer</td>
			<td>111623</td>
			<td></td>
		</tr>
		<tr>
			<td>Corning ultra-low attachment 96-well plates&#160;</td>
			<td>Corning</td>
			<td>CLS3474-24EA</td>
			<td></td>
		</tr>
		<tr>
			<td>6-8 week old female C57BL/6 mice&#160;</td>
			<td>Jackson Research Laboratories, Jax</td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Murine B16.Flt3L melanoma cell line</td>
			<td></td>
			<td></td>
			<td>described by Mach et al. ,2000</td>
		</tr>
		<tr>
			<td>Serum free DMEM and RPMI media</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>500 ml DMEM with L-glutamine, or 500 ml RPMI-1640 with L-glutamine 
			 
			5 ml MEM nonessential amino acids (100x, 10 mM)&#160;&#160;&#160;&#160; 
			 
			5 ml HEPES Buffer (1 M)&#160;&#160;&#160;&#160; 
			 
			5 ml L-glutamine (200 mM)&#160; 
			 
			0.5 ml 2-mercaptoethanol (5.5 x 10-2 M)</td>
			<td></td>
			<td></td>
			<td>Mix all the ingredients in a biosafety cabinet with either DMEM or RPMI media depending on your need.&#160; Filter sterilize the media by passing through a 0.22 &#181;m vacuum filtration system.</td>
		</tr>
		<tr>
			<td>Complete RPMI and DMEM media</td>
			<td></td>
			<td></td>
			<td>Add 50 ml of heat inactivated fetal calf serum to serum free RPMI or DMEM media to obtain complete media.</td>
		</tr>
		<tr>
			<td>MACS buffer:&#160;</td>
			<td></td>
			<td></td>
			<td>Add 2 ml of 0.5 M EDTA and 10 ml of heat inactivated fetal calf serum to 500 ml of Phosphate-buffered saline (PBS, Ca2+ and Mg2+ Free, pH 7.2) and 2 ug/ml 2.4G2 (Fc-Block antibody).&#160;</td>
		</tr>
		<tr>
			<td>FACS staining buffer</td>
			<td></td>
			<td></td>
			<td>Dissolve sodium azide to 0.05% (0.25 g per 500 ml) in MACS buffer to obtain FACS staining buffer</td>
		</tr>
		<tr>
			<td>10x Collagenase D and DNase 1 stock solution 
			Dissolve 1 g of collagenase D and 0.2 ml of DNase 1 stock (1 mg/ml, 100x) in 20 ml of PBS containing Ca++ and Mg++ to obtain a solution of approximately 1,000-</td>
			<td></td>
			<td></td>
			<td>2,000 Units of collagenase activity per ml 
			 
			This 10x stock solution can be prepared ahead of time and stored at -20 &#176;C for several weeks. Dilute 1 ml of this with 9 ml of serum free RPMI immediately before use</td>
		</tr>
	</tbody>
</table>

an efficient and high yield method for isolation of mouse dendritic cell subsets

Dendritic cells (DCs) are professional antigen-presenting cells primarily responsible for acquiring, processing and presenting antigens on antigen presenting molecules to initiate T-cell-mediated immunity. Dendritic cells can be separated into several phenotypically and functionally heterogeneous subsets. Three important subsets of splenic dendritic cells are plasmacytoid, CD8&#945;Pos and CD8&#945;Neg cells. The plasmacytoid DCs are natural producers of type I interferon and are important for anti-viral T cell immunity. The CD8&#945;Neg DC subset is specialized for MHC class II antigen presentation and is centrally involved in priming CD4 T cells. The CD8&#945;Pos DCs are primarily responsible for cross-presentation of exogenous antigens and CD8 T cell priming. The CD8&#945;Pos DCs have been demonstrated to be most efficient at the presentation of glycolipid antigens by CD1d molecules to a specialized T cell population known as invariant natural killer T (iNKT) cells. Administration of Flt-3 ligand increases the frequency of migration of dendritic cell progenitors from bone marrow, ultimately resulting in expansion of dendritic cells in peripheral lymphoid organs in murine models. We have adapted this model to purify large numbers of functional dendritic cells for use in cell transfer experiments to compare in vivo proficiency of different DC subsets.

The outcome of this procedure relies on the expansion of DC subsets by murine Flt-3L expressed by the implanted melanoma cells. The B16.Flt3L tumor was derived from a C57BL/6 mouse, and should be implanted into animals with that strain background in order to avoid failure of the tumor to become established due to rejection. In some cases, it may be desirable to use genetically modified mice to derive DCs with known defects in signaling pathways or receptors of interest. It is important to...

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An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

Distinct dendritic cell subsets exist as rare populations in lymphoid organs, and therefore are challenging to isolate in sufficient numbers and purity for immunological experiments. Here we describe a high efficiency, high yield method for isolation of all of the currently known major subsets of mouse splenic dendritic cells.

Dendritic cells (DCs) are professional antigen-presenting cells primarily responsible for acquiring, processing and presenting antigens on antigen ...

The overall goal of this protocol, is to develop of a high efficiency, high yield method for generating dendritic cell or DCs, that fatefully reflect their in-vivo phenotypic and functional divergence. Dendritic cells exist as great populations in lymphoid organs. Therefore, we use filter ligand to increase the frequency of these essential cells in donor tissues to facilitate that isolation.The main advantage of this technique is that it removes generation of all the DC subsets in suitable numbers for analysis using only the commercially available agents. To harvest flt-3 ligand expressing B16 melanoma cells from a 90%confluent culture, first wash the cells with PBS and incubate the culture with 05%trypsin at 37 degrees Celsius. After 5 minutes, quench the protease activity with 20 milliliters of 4 degrees Celsius complete dima medium and detach the adherent cell model layer with light tapping and gentle pipetting.Collect the cells by centrifugation and count them. Then, re-suspend the single cell suspension to a 1 times to the 8 cells per milliliter concentration in PBS for their subcutaneous injection into C57 black 6 recipient mice. When the tumor reaches two to ten milliliters in diameter, harvest the spleens from the tumor bearing animals and place the spleens in a petri dish containing fresh RPMI medium.Using a scalpel, cut the tissues into 0.2 square centimeters pieces, and then incubate the fragments in ten milliliters of collagenase and Dnase at 37 degrees Celsius. After 30 minutes, pour the partially digested tissue slurry onto a 70 micron cell strainer, and use a five milliliter syringe plunger to press the remaining tissue fragments through the mesh of the strainer. Rinse the filter with 10 milliliters of fresh medium, pooling the wash with the rest of the single cell suspension and pellet the cells.We suspend the cell pellet in 2 milliliters of red blood cell lysis buffer at room temperature for 10 minutes. Then wash the cells in 10 milliliters of fresh RPMI medium, and re-suspend them at 1 times 10 to the 8 cells per milliliter in cell sorting buffer containing FC block. To isolate the plasma cytode DCs, thoroughly mix 300 microliters of biotin-labelled antibody cocktail from a plasma cytode DC isolation kit with 200 microliters of the splenic single cell suspension.Place the cells in an ice water bath for 15 minutes, with gentle tapping every three minutes. Then wash the cells with 12 milliliters of cell sorting buffer, and re-suspend the pellet in 500 microliters of fresh sorting buffer. Next, incubate the cells in 300 microliters of anti-biotin, antibody conjugated beads for another 15 minutes in the ice water with regular tapping.After washing the cells in fresh sorting buffer, re-suspend the pallet in 2 milliliters of cell sorting buffer, and load an appropriately sized magnetic column onto its corresponding magnet. Equilibrate the column with five milliliters of fresh 4 degree Celsius cell sorting buffer. When all of the buffer has drained from the top of the column, carefully add the cells to the center of the surface of the column head, and collect the flow-through.Then wash the column with 10 milliliters of fresh, 4 degrees Celsius sorting buffer and collect the flow-through in the same tube. After passage though a second magnetic column, a plasma cytode dendritic cell population with a greater than 94%purity can be expected. To isolate the CD8aplha+and CD8alpha-DCs, mix the rest of the splenic cell suspension with 100 microliters of biotion conjugated antibody cocktail from a CD8alpha+dendritic cell isolation kit for 15 minutes on ice with gentle tapping, as just demonstrated.At the end of the incubation, wash the cells in 12 milliliters of 4 degrees Celsius cell sorting buffer, and re-suspend the pellet in 150 microliters of fresh 4 degrees Celsius cell sorting buffer. Next, mix the cells with 100 microliters of the CD8alpha+dendritic cell isolation kit anti-biotin beads. After 15 minutes on ice with gentle tapping, wash the cells in 10 milliliters of 4 degrees Celsius cell sorting buffer, and re-suspend the pellet in 1 milliliter of fresh 4 degrees Celsius sorting buffer.At the end of the incubation, sort the cells by magnetic bead separation, as just demonstrated, collecting the flow-through and the first wash. Then, spin down the cells and re-suspend the pellet in one milliliter of fresh 4 degrees Celsius cell sorting buffer. Now label the cells with 200 microliters of anti-CD8aplha conjugated magnetic beads from the kit, and pass the cells through a new column, collecting the CD8alpha-dendritic cell flow-through.To collect the CD8alpha+DCs, transfer the column into a 15 milliliter conical tube, and plunge 5 milliliters of fresh 4 degrees Celsius cell sorting buffer though the column. After the running the cells through a second column, a greater than 96%CD8alpha+dendritic cell population can be expected. To isolate the CD8alpha-cells, spin the the CD8alpha-flow-through cell suspension.Then label the cells with 100 microliters of anti-CD11 c-magnetic beads and collect the magnetic bead positive cell population, as just demonstrated, to obtain a greater than 97%CD8alpha-dendritic cell subset population. Finally, determine the number of live cells, by trypan blue exclusion. Once the tumor becomes palpable, the B16 flt-3 ligand tumor bearing mice consistently exhibit a dramatic increase in the splenic cellularity that correlates with the expansion of the splenic dendritic cell subsets.Interestingly, while a 15 to 20-fold increase in the absolute cell numbers is observed for the conventional DCs in these animals, only about a 4-fold increase is observed for the plasma cytode DC subset. The different dendritic cell subsets are characterized according to their B220, CD11b, CD11c and CD8alpha expression. The cell populations also exhibit other unique subset markers, however, with mPDCA1 expressed exclusively on the plasma cytode DCs DEC205 highly expressed on the CD8alpa+DCs, and CD11b and 33D1 detected most prominently on the CD8alpha-DCs.Using this method, we have demonstrated CD8alpa+DCs to be the most efficient in the presentation of antigens by CD bonding molecules to a specialized T-cell population known as invariant NKT cells. The most critical feature of DC isolation is to maintain strict sterility and antidoxant-free conditions. During the procedures, these T-cells are highly responsive to antidoxant.While attempting this procedure, it is important to remember to handle the cells gently, as repeated mechnanical stimulation may alter the maturation state of dendtritic cells. Once mastered, this technique can be used to isolate a high number of all the major DC subsets from single spleen. Thanks for watching and good luck with your experiments.

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JoVE Journal

Immunology and Infection

15.0K ビュー.  Albert Einstein College of Medicine. The overall goal of this protocol, is to develop of a high efficiency, high yield method for generating dendritic cell or DCs, that fatefully reflect their in-vivo phenotypic and functional divergence. Dendritic cells exist as great populations in lymphoid organs. Therefore, we use filter ligand to increase the frequency of these essential cells in donor tissues to facilitate that isolation.The main advantage of this technique is that it removes generation of all the DC subsets in suit...