Name: antigenic liposomes for generation of disease-specific antibodies
Uploaded: 2018-10-25T13:00:00
Description: Watch this Scientific Journal Video about Antigenic Liposomes for Generation of Disease-specific Antibodies at JoVE.com

This research was supported by grants from the Department of Defense (W81XWH-16-1-0302 and W81XWH-16-1-0303).

The general method of coupling protein to lipid and incorporating into liposomes is based largely on earlier work15. All animal procedures described below have been approved by the University of North Carolina at Chapel Hill Institutional Animal Care and Use Committee (IACUC). All mice used in the peanut allergy model are BALB/cJ females purchased from at 3 weeks of age. The University of Alberta Animal Care and Use Committee (ACUC) has approved experiments involving use of mouse spleens for e...

<ol>
	<li>Gupta, R. 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=The+prevalence,+severity,+and+distribution+of+childhood+food+allergy+in+the+United+States.">The prevalence, severity, and distribution of childhood food allergy in the United States.</a> Pediatrics. 128 (1), e9-e17 (2011).</li><li>Sicherer, S. H., Munoz-Furlong, A., Godbold, J. H., Sampson, H. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=US+prevalence+of+self-reported+peanut,+tree+nut,+and+sesame+allergy:+11-year+follow-up.">US prevalence of self-reported peanut, tree nut, and sesame allergy: 11-year follow-up.</a> Journal of Allergy and Clinical Immunology. 125 (6), 1322-1326 (2010).</li><li>Kim, E. H., 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=Sublingual+immunotherapy+for+peanut+allergy:+clinical+and+immunologic+evidence+of+desensitization.">Sublingual immunotherapy for peanut allergy: clinical and immunologic evidence of desensitization.</a> Journal of Allergy Clinical Immunology. 127 (3), 640-646 (2011).</li><li>Vickery, B. 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=Sustained+unresponsiveness+to+peanut+in+subjects+who+have+completed+peanut+oral+immunotherapy.">Sustained unresponsiveness to peanut in subjects who have completed peanut oral immunotherapy.</a> Journal of Allergy and Clinical Immunology. 133 (2), 468 (2014).</li><li>Jones, S. M., 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=Epicutaneous+immunotherapy+for+the+treatment+of+peanut+allergy+in+children+and+young+adults.">Epicutaneous immunotherapy for the treatment of peanut allergy in children and young adults.</a> Journal of Allergy and Clinical Immunology. 139 (4), 1242 (2017).</li><li>Varshney, 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+randomized+controlled+study+of+peanut+oral+immunotherapy:+clinical+desensitization+and+modulation+of+the+allergic+response.">A randomized controlled study of peanut oral immunotherapy: clinical desensitization and modulation of the allergic response.</a> Journal of Allergy Clinical Immunology. 127 (3), 654-660 (2011).</li><li>Anagnostou, K., 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=Assessing+the+efficacy+of+oral+immunotherapy+for+the+desensitisation+of+peanut+allergy+in+children+(STOP+II):+a+phase+2+randomised+controlled+trial.">Assessing the efficacy of oral immunotherapy for the desensitisation of peanut allergy in children (STOP II): a phase 2 randomised controlled trial.</a> Lancet. 383 (9925), 1297-1304 (2014).</li><li>Sampson, H. A., 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=Effect+of+Varying+Doses+of+Epicutaneous+Immunotherapy+vs+Placebo+on+Reaction+to+Peanut+Protein+Exposure+Among+Patients+With+Peanut+Sensitivity:+A+Randomized+Clinical+Trial.">Effect of Varying Doses of Epicutaneous Immunotherapy vs Placebo on Reaction to Peanut Protein Exposure Among Patients With Peanut Sensitivity: A Randomized Clinical Trial.</a> The Journal of the American Medical Association. 318 (18), 1798-1809 (2017).</li><li>Bednar, K. J., 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=Human+CD22+Inhibits+Murine+B+Cell+Receptor+Activation+in+a+Human+CD22+Transgenic+Mouse+Model.">Human CD22 Inhibits Murine B Cell Receptor Activation in a Human CD22 Transgenic Mouse Model.</a> Journal Immunology. 199 (9), 3116-3128 (2017).</li><li>Macauley, M. 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=Antigenic+liposomes+displaying+CD22+ligands+induce+antigen-specific+B+cell+apoptosis.">Antigenic liposomes displaying CD22 ligands induce antigen-specific B cell apoptosis.</a> Journal Clinical Investigation. 123 (7), 3074-3083 (2013).</li><li>Orgel, K. A., 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=Exploiting+CD22+on+antigen-specific+B+cells+to+prevent+allergy+to+the+major+peanut+allergen+Ara+h+2.">Exploiting CD22 on antigen-specific B cells to prevent allergy to the major peanut allergen Ara h 2.</a> Journal Allergy Clinical Immunology. 139 (1), 366-369 (2017).</li><li>Smarr, C. B., Hsu, C. L., Byrne, A. J., Miller, S. D., Bryce, P. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Antigen-fixed+leukocytes+tolerize+Th2+responses+in+mouse+models+of+allergy.">Antigen-fixed leukocytes tolerize Th2 responses in mouse models of allergy.</a> Journal of Immunology. 187 (10), 5090-5098 (2011).</li><li>Kulis, M., 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=The+2S+albumin+allergens+of+Arachis+hypogaea,+Ara+h+2+and+Ara+h+6,+are+the+major+elicitors+of+anaphylaxis+and+can+effectively+desensitize+peanut-allergic+mice.">The 2S albumin allergens of Arachis hypogaea, Ara h 2 and Ara h 6, are the major elicitors of anaphylaxis and can effectively desensitize peanut-allergic mice.</a> Clinical and Experimental Allergy. 42 (2), 326-336 (2012).</li><li>Dang, T. 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=Increasing+the+accuracy+of+peanut+allergy+diagnosis+by+using+Ara+h+2.">Increasing the accuracy of peanut allergy diagnosis by using Ara h 2.</a> Journal of Allergy Clinical Immunology. 129 (4), 1056-1063 (2012).</li><li>Loughrey, H. C., Choi, L. S., Cullis, P. R., Bally, 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=Optimized+procedures+for+the+coupling+of+proteins+to+liposomes.">Optimized procedures for the coupling of proteins to liposomes.</a> Journal Immunological Methods. 132 (1), 25-35 (1990).</li><li>Sen, M., 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=Protein+structure+plays+a+critical+role+in+peanut+allergen+stability+and+may+determine+immunodominant+IgE-binding+epitopes.">Protein structure plays a critical role in peanut allergen stability and may determine immunodominant IgE-binding epitopes.</a> Journal of Immunology. 169 (2), 882-887 (2002).</li><li>Krall, N., da Cruz, F. P., Boutureira, O., Bernardes, G. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Site-selective+protein-modification+chemistry+for+basic+biology+and+drug+development.">Site-selective protein-modification chemistry for basic biology and drug development.</a> Nature Chemistry. 8 (2), 103-113 (2016).</li><li>Jimenez-Saiz, R., 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=Lifelong+memory+responses+perpetuate+humoral+TH2+immunity+and+anaphylaxis+in+food+allergy.">Lifelong memory responses perpetuate humoral TH2 immunity and anaphylaxis in food allergy.</a> Journal Allergy and Clinical Immunology. 140 (6), 1604-1615 (2017).</li><li>Moutsoglou, D. M., Dreskin, S. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Prolonged+Treatment+of+Peanut-Allergic+Mice+with+Bortezomib+Significantly+Reduces+Serum+Anti-Peanut+IgE+but+Does+Not+Affect+Allergic+Symptoms.">Prolonged Treatment of Peanut-Allergic Mice with Bortezomib Significantly Reduces Serum Anti-Peanut IgE but Does Not Affect Allergic Symptoms.</a> International Archives of Allergy and Immunology. 170 (4), 257-261 (2016).</li><li>LaMothe, R. A., 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=Tolerogenic+Nanoparticles+Induce+Antigen-Specific+Regulatory+T+Cells+and+Provide+Therapeutic+Efficacy+and+Transferrable+Tolerance+against+Experimental+Autoimmune+Encephalomyelitis.">Tolerogenic Nanoparticles Induce Antigen-Specific Regulatory T Cells and Provide Therapeutic Efficacy and Transferrable Tolerance against Experimental Autoimmune Encephalomyelitis.</a> Frontiers in Immunology. 9, 281 (2018).</li><li>Srivastava, 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=Investigation+of+peanut+oral+immunotherapy+with+CpG/peanut+nanoparticles+in+a+murine+model+of+peanut+allergy.">Investigation of peanut oral immunotherapy with CpG/peanut nanoparticles in a murine model of peanut allergy.</a> J Allergy Clin Immunol. 138 (2), 536-543 (2016).</li><li>Bellinghausen, I., Saloga, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+allergic+immune+responses+in+humanized+mice.">Analysis of allergic immune responses in humanized mice.</a> Cellular Immunology. 308, 7-12 (2016).</li><li>Pillai, S., Mattoo, H., Cariappa, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=B+cells+and+autoimmunity.">B cells and autoimmunity.</a> Curr Opin Immunol. 23 (6), 721-731 (2011).</li><li>Mantegazza, R., Cordiglieri, C., Consonni, A., Baggi, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Animal+models+of+myasthenia+gravis:+utility+and+limitations.">Animal models of myasthenia gravis: utility and limitations.</a> International Journal of General Medicine. 9, 53-64 (2016).</li><li>Berman, P. 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The methods outlined here are a general protocol for the conjugation of a protein to a lipid which enables the display of the protein on liposomal nanoparticles. For very large multi-subunit proteins, this protocol may have limited utility. The ideal method would be the introduction of a site-specific tag that enables a biorthogonal chemical linking strategy to be used. If expressing the protein recombinantly, this can be possible using available site-specific strategies17, and a wide array of fun...

Food allergy affects 8% of children in the United States, and has increased in prevalence over the past decade1. Allergy to peanut affects 1% of children and is not typically outgrown2. Although several promising clinical trials are underway for the treatment of food allergy, including oral immunotherapy (OIT), sublingual immunotherapy (SLIT), and epicutaneous immunotherapy (EPIT), there are currently no FDA-approved treatment strategies for desensitizing peanut-allergic individuals3,4,5,6,7,8. Therefore, allergic individuals must strictly avoid allergens to avoid anaphylaxis. Many questions remain regarding routes of sensitization and underlying mechanisms of food allergy development.
Mouse models are a valuable tool for studying the mechanisms of allergy as well as developing new tolerogenic and desensitization therapies9,10,11,12. This is particularly true because the major peanut allergen (Ara h 2; Ah2) in humans is also the dominant allergen in several described mouse models13,14. While mouse models of peanut allergy are invaluable in studying mechanisms of sensitization and tolerance, a drawback is that they can be variable and require the use of adjuvants. More potent immunogens would be one way to minimize the intrinsic variability of such models. Since B-cells are strongly activated by multivalent antigens, antigenic liposomes displaying the allergen are a good option because of their ability to potentially activate B-cells through the B-cell receptor (BCR) while also having the property of efficiently priming the T-cell compartment through being taken up non-specifically by antigen-presenting cells.
Here, we describe a detailed protocol for conjugating protein antigens to liposomal nanoparticles using a facile and modular strategy. Using a surrogate antigen, anti-IgM Fab fragment, we demonstrate how potent such antigenic liposomes can be in stimulating B-cell activation. Antigenic liposomes displaying Ah2 antigen were used to develop a new mouse model of conferred sensitivity. In this model, splenocytes from verified peanut allergic mice, containing peanut-specific memory B- and T-cells, are transferred into na&#239;ve congenic mice. Memory antibody responses are induced by injection of liposomes conjugated with Ah2 into the recipient mice, in order to induce antibodies against Ah2. Followed by only one boost with soluble Ah2, Ah2-specific antibodies give rise to a strong anaphylactic response when these mice are subsequently challenged with Ah2. As mice undergoing the allergic reaction respond in a highly uniform manner and have not received an adjuvant, this approach is a desirable peanut allergy model and the outcomes suggest that it may have utility in other mouse models driven by antigens directed at allergens and possibly autoantigens.

<table>
	<tbody>
		<tr>
			<td>Model 2110 Fraction Collector</td>
			<td>BioRad</td>
			<td>7318122</td>
			<td></td>
		</tr>
		<tr>
			<td>Cholestrol</td>
			<td>Sigma</td>
			<td>C8667</td>
			<td>Sigma grade 99%</td>
		</tr>
		<tr>
			<td>SPDP</td>
			<td>Thermo Fisher Scientific</td>
			<td>21857</td>
			<td></td>
		</tr>
		<tr>
			<td>DSPC</td>
			<td>Avanti</td>
			<td>850365</td>
			<td></td>
		</tr>
		<tr>
			<td>DSPE-PEG 18:0</td>
			<td>Avanti</td>
			<td>880120</td>
			<td></td>
		</tr>
		<tr>
			<td>DSPE-PEG Maleimide</td>
			<td>Avanti</td>
			<td>880126</td>
			<td></td>
		</tr>
		<tr>
			<td>Extruder</td>
			<td>Avanti</td>
			<td>610000</td>
			<td>1mL syringe with holder/heating block</td>
		</tr>
		<tr>
			<td>Filters 0.1 &#181;m</td>
			<td>Avanti</td>
			<td>610005</td>
			<td></td>
		</tr>
		<tr>
			<td>Filters 0.8 &#181;m</td>
			<td>Avanti</td>
			<td>610009</td>
			<td></td>
		</tr>
		<tr>
			<td>10mm Filter Supports</td>
			<td>Avanti</td>
			<td>6100014</td>
			<td></td>
		</tr>
		<tr>
			<td>Glass Round Bottom Flask</td>
			<td>Sigma</td>
			<td>Z100633</td>
			<td></td>
		</tr>
		<tr>
			<td>Turnover stoppers</td>
			<td>Thermo Fisher Scientific</td>
			<td>P-301398</td>
			<td></td>
		</tr>
		<tr>
			<td>Tubing</td>
			<td>Thermo Fisher Scientific</td>
			<td>P-198194</td>
			<td></td>
		</tr>
		<tr>
			<td>Leur Lock</td>
			<td>Thermo Fisher Scientific</td>
			<td>k4201634503</td>
			<td></td>
		</tr>
		<tr>
			<td>Sephadex G50 Beads</td>
			<td>GE Life Sciences</td>
			<td>17004201</td>
			<td></td>
		</tr>
		<tr>
			<td>Sephadex G100 Beads</td>
			<td>GE Life Sciences</td>
			<td>17006001</td>
			<td></td>
		</tr>
		<tr>
			<td>Heat Inactivated Fetal Calf Serum</td>
			<td>Thermo Fisher Scientific</td>
			<td>10082147</td>
			<td></td>
		</tr>
		<tr>
			<td>HEPES (1M)</td>
			<td>Thermo Fisher Scientific</td>
			<td>15630080</td>
			<td></td>
		</tr>
		<tr>
			<td>EGTA</td>
			<td>Sigma</td>
			<td>E3889</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin-Streptomycin (10,000 U/mL)</td>
			<td>Thermo Fisher Scientific</td>
			<td>15140122</td>
			<td></td>
		</tr>
		<tr>
			<td>1x RBC lysis Buffer</td>
			<td>Thermo Fisher Scientific</td>
			<td>00-4333-57</td>
			<td></td>
		</tr>
		<tr>
			<td>Indo-1</td>
			<td>Invitrogen</td>
			<td>I1203</td>
			<td></td>
		</tr>
		<tr>
			<td>CD5-PE</td>
			<td>BioLegend</td>
			<td>100608</td>
			<td></td>
		</tr>
		<tr>
			<td>B220-PE-Cy7</td>
			<td>BioLegend</td>
			<td>103222</td>
			<td></td>
		</tr>
		<tr>
			<td>HBSS</td>
			<td>Thermo Fisher Scientific</td>
			<td>14170112</td>
			<td>without calcium and magnesium</td>
		</tr>
		<tr>
			<td>MgCl2</td>
			<td>Sigma</td>
			<td>M8266</td>
			<td></td>
		</tr>
		<tr>
			<td>CaCl2</td>
			<td>Sigma</td>
			<td>C4901</td>
			<td></td>
		</tr>
		<tr>
			<td>Fab anti-mouse IgM</td>
			<td>Jackson ImmunoResearch</td>
			<td>115-007-020</td>
			<td></td>
		</tr>
		<tr>
			<td>F(ab&#39;)2 anti-mouse IgM</td>
			<td>Jackson ImmunoResearch</td>
			<td>115-006-020</td>
			<td></td>
		</tr>
		<tr>
			<td>Peanut flour</td>
			<td>Golden Peanut Co.</td>
			<td>521271</td>
			<td>12% fat light roast, 50% protein</td>
		</tr>
		<tr>
			<td>Animal feeding needles</td>
			<td>Cadence Science</td>
			<td>7920</td>
			<td>22g x 1.5&#34;, 1.25 mm - straight</td>
		</tr>
		<tr>
			<td>Microprobe thermometer</td>
			<td>Physitemp</td>
			<td>BAT-12</td>
			<td></td>
		</tr>
		<tr>
			<td>Rectal probe for mice</td>
			<td>Physitemp</td>
			<td>Ret-3</td>
			<td></td>
		</tr>
		<tr>
			<td>Cholera toxin, from vibrio cholera</td>
			<td>List Biological Laboratories, Inc.</td>
			<td>100B</td>
			<td>Azide free</td>
		</tr>
		<tr>
			<td>BCA Protein Assay Kit</td>
			<td>Pierce</td>
			<td>23225</td>
			<td></td>
		</tr>
		<tr>
			<td>Carbonate-bicarbonate buffer</td>
			<td>Sigma</td>
			<td>C3041</td>
			<td></td>
		</tr>
		<tr>
			<td>TMB Stop Solution</td>
			<td>KPL</td>
			<td>50-85-06</td>
			<td></td>
		</tr>
		<tr>
			<td>SureBlue TMB Microwell Peroxidase Substrate</td>
			<td>KPL</td>
			<td>5120-0077</td>
			<td></td>
		</tr>
		<tr>
			<td>96 well Immulon 4HBX plate</td>
			<td>Thermo Scientific</td>
			<td>3855</td>
			<td></td>
		</tr>
		<tr>
			<td>Purified soluble Ara h 2</td>
			<td>N/A</td>
			<td>N/A</td>
			<td>purified as in: Sen, et al., 2002, Journal of Immunology</td>
		</tr>
		<tr>
			<td>HSA-DNP</td>
			<td>Sigma</td>
			<td>A-6661</td>
			<td></td>
		</tr>
		<tr>
			<td>Mouse IgE anti-DNP</td>
			<td>Accurate Chemical</td>
			<td>BYA60251</td>
			<td></td>
		</tr>
		<tr>
			<td>Sheep anti-Mouse IgE</td>
			<td>The Binding Site</td>
			<td>PC284</td>
			<td></td>
		</tr>
		<tr>
			<td>Biotinylated Donkey anti-Sheep IgG</td>
			<td>Accurate Chemical</td>
			<td>JNS065003</td>
			<td></td>
		</tr>
		<tr>
			<td>NeutrAvidin Protein, HRP</td>
			<td>ThermoFisher Scientific</td>
			<td>31001</td>
			<td></td>
		</tr>
		<tr>
			<td>Mouse IgG1 anti-DNP</td>
			<td>Accurate Chemical</td>
			<td>MADNP105</td>
			<td></td>
		</tr>
		<tr>
			<td>HRP Goat anti-mouse IgG1</td>
			<td>Southern Biotech</td>
			<td>1070-05</td>
			<td></td>
		</tr>
		<tr>
			<td>1 mL Insulin Syringes</td>
			<td>BD</td>
			<td>329412</td>
			<td>U-100 Insulin, 0.40 mm(27G) x 16.0 mm (5/8&#34;)</td>
		</tr>
		<tr>
			<td>Superfrost Microscope Slides</td>
			<td>Fisher Scientific</td>
			<td>12-550-14</td>
			<td>25 x 75 x 1.0 mm</td>
		</tr>
		<tr>
			<td>ACK Lysing Buffer</td>
			<td>gibco by Life Technologies</td>
			<td>A10492-01</td>
			<td>100 mL</td>
		</tr>
		<tr>
			<td>RPMI 1640 Medium</td>
			<td>Thermo Fisher Scientific</td>
			<td>11875093</td>
			<td>500 mL</td>
		</tr>
		<tr>
			<td>Cell Strainer</td>
			<td>Corning</td>
			<td>352350</td>
			<td>70 &#956;m Nylon, White, Sterile, Individually packaged</td>
		</tr>
		<tr>
			<td>NuPAGE 4-12% Bis-Tris Protein Gels</td>
			<td>Invitrogen</td>
			<td>NP0322BOX</td>
			<td>10 gels</td>
		</tr>
		<tr>
			<td>NuPAGE LDS buffer, 4X</td>
			<td>Invitrogen</td>
			<td>NP0008</td>
			<td>250 mL</td>
		</tr>
		<tr>
			<td>SeeBlue Plus2 Pre-stained standard</td>
			<td>Invitrogen</td>
			<td>LC5925</td>
			<td>500 &#181;L</td>
		</tr>
		<tr>
			<td>NuPAGE MES/SDS running buffer, 20X</td>
			<td>Invitrogen</td>
			<td>NP0002</td>
			<td>500 mL</td>
		</tr>
		<tr>
			<td>GelCode Blue Stain</td>
			<td>Thermo Scientific</td>
			<td>24590</td>
			<td>500 mL</td>
		</tr>
	</tbody>
</table>

antigenic liposomes for generation of disease-specific antibodies

Antibody responses provide critical protective immunity to a wide array of pathogens. There remains a high interest in generating robust antibodies for vaccination as well as understand how pathogenic antibody responses develop in allergies and autoimmune disease. Generating robust antigen-specific antibody responses is not always trivial. In mouse models, it often requires multiple rounds of immunizations with adjuvant that leads to a great deal of variability in the levels of induced antibodies. One example is in mouse models of peanut allergies where more robust and reproducible models that minimize mouse numbers and the use of adjuvant would be beneficial. Presented here is a highly reproducible mouse model of peanut allergy anaphylaxis. This new model relies on two key factors: (1) antigen-specific splenocytes are adoptively transferred from a peanut-sensitized mouse into a na&#239;ve recipient mouse, normalizing the number of antigen-specific memory B- and T-cells across a large number of mice; and (2) recipient mice are subsequently boosted with a strong multivalent immunogen in the form of liposomal nanoparticles displaying the major peanut allergen (Ara h 2). The major advantage of this model is its reproducibility, which ultimately lowers the number of animals used in each study, while minimizing the number of animals receiving multiple injections of adjuvant. The modular assembly of these immunogenic liposomes provides relatively facile adaptability to other allergic or autoimmune models that involve pathogenic antibodies.

Conjugation of the protein of interest with DSPE-PEG(2000) can be demonstrated by running a reducing showing an increase in molecular weight compared to the unconjugated protein. Figure 1A shows a representative gel of anti-mouse IgM F(ab) fragment conjugation to PEG-DSPE, which shows a 2&#8211;3 kDa bandshift for the denatured protein. Note that approximately 50% of the protein appears to be modified, which is expected given that 1:1 stoichiometry was achiev...

Watch this Scientific Journal Video about Antigenic Liposomes for Generation of Disease-specific Antibodies at JoVE.com

Antigenic Liposomes for Generation of Disease-specific Antibodies

Described is the preparation of antigenic liposomal nanoparticles and their use in stimulating B-cell activation in vitro and in vivo. Consistent and robust antibody responses led to the development of a new peanut allergy model. The protocol for generating antigenic liposomes can be extended to different antigens and immunization models.

Antibody responses provide critical protective immunity to a wide array of pathogens. There remains a high interest in generating robust antibodies for ...

Research

JoVE Journal

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Elimination of harmful antibodies from organisms is a valuable approach for the intervention of antibody-associated diseases, such as Dengue hemorrhagic ...