Name: detection of polyfunctional t cells in children vaccinated with japanese encephalitis vaccine via the flow cytometry technique
Uploaded: 2022-09-23T15:00:00
Description: Watch this Scientific Journal Video about Detection of Polyfunctional T Cells in Children Vaccinated with Japanese Encephalitis Vaccine via the Flow Cytometry Technique at JoVE.com

R.W. was supported by National Natural Science Foundation of China (82002130), Beijing Natural Science Foundation of&#160;China (7222059). ZD.X. was supported by the CAMS Innovation Fund for Medical Sciences (2019-I2M-5-026).

Ethical approval for the present study was obtained by the Ethics Committee of Beijing Children&#39;s Hospital, Capital Medical University (Approval Number: 2020-k-85). Volunteers were recruited from Beijing Children&#39;s Hospital, Capital Medical University. Peripheral venous blood samples were obtained from apparently healthy children (2 years old) who had previously received a prime and boosted vaccination with live-attenuated JE SA14-14-2 vaccine for less than half a year (JE-vaccinated children, n = 5) and unvaccin...

<ol>
	<li>Vanden Eynde, C., Sohier, C., Matthijs, S., De Regge, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Japanese+encephalitis+virus+interaction+with+mosquitoes:+A+review+of+vector+competence,+vector+capacity+and+mosquito+immunity.">Japanese encephalitis virus interaction with mosquitoes: A review of vector competence, vector capacity and mosquito immunity.</a> Pathogens. 11 (3), 317 (2022).</li><li>Wang, 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=The+epidemiology+and+disease+burden+of+children+hospitalized+for+viral+infections+within+the+family+Flaviviridae+in+China:+A+national+cross-sectional+study.">The epidemiology and disease burden of children hospitalized for viral infections within the family Flaviviridae in China: A national cross-sectional study.</a> PLoS Neglected Tropical Diseases. 16 (7), 0010562 (2022).</li><li>Wang, 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=Decreases+in+both+the+seroprevalence+of+serum+antibodies+and+seroprotection+against+Japanese+encephalitis+virus+among+vaccinated+children.">Decreases in both the seroprevalence of serum antibodies and seroprotection against Japanese encephalitis virus among vaccinated children.</a> Virologica Sinica. 34 (3), 243-252 (2019).</li><li>Wang, 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=Neutralizing+antibody+rather+than+cellular+immune+response+is+maintained+for+nearly+20+years+among+Japanese+encephalitis+SA14-14-2+vaccinees+in+an+endemic+setting.">Neutralizing antibody rather than cellular immune response is maintained for nearly 20 years among Japanese encephalitis SA14-14-2 vaccinees in an endemic setting.</a> Infection, Genetics and Evolution. 85, 104476 (2020).</li><li>Wang, 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=T+cell+immunity+rather+than+antibody+mediates+cross-protection+against+Zika+virus+infection+conferred+by+a+live+attenuated+Japanese+encephalitis+SA14-14-2+vaccine.">T cell immunity rather than antibody mediates cross-protection against Zika virus infection conferred by a live attenuated Japanese encephalitis SA14-14-2 vaccine.</a> Applied Microbiology and Biotechnology. 104 (15), 6779-6789 (2020).</li><li>Redant, V., Favoreel, H. W., Dallmeier, K., Van Campe, W., De Regge, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Japanese+encephalitis+virus+persistence+in+porcine+tonsils+is+associated+with+a+weak+induction+of+the+innate+immune+response,+an+absence+of+IFNgamma+mRNA+expression,+and+a+decreased+frequency+of+CD4(+)CD8(+)+double-positive+T+cells.">Japanese encephalitis virus persistence in porcine tonsils is associated with a weak induction of the innate immune response, an absence of IFNgamma mRNA expression, and a decreased frequency of CD4(+)CD8(+) double-positive T cells.</a> Frontiers in Cellular and Infection Microbiology. 12, 834888 (2022).</li><li>Jain, 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=CD8+T+cells+protect+adult+naive+mice+from+JEV-induced+morbidity+via+lytic+function.">CD8 T cells protect adult naive mice from JEV-induced morbidity via lytic function.</a> PLoS Neglected Tropical Diseases. 11 (2), 0005329 (2017).</li><li>Khakhum, N., Bharaj, P., Walker, D. H., Torres, A. G., Endsley, J. 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-specific+antibody+and+polyfunctional+T+cells+generated+by+respiratory+immunization+with+protective+Burkholderia+DeltatonB+Deltahcp1+live+attenuated+vaccines.">Antigen-specific antibody and polyfunctional T cells generated by respiratory immunization with protective Burkholderia DeltatonB Deltahcp1 live attenuated vaccines.</a> NPJ Vaccines. 6 (1), 72 (2021).</li><li>Weaver, J. 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=Increase+in+IFNgamma(-)IL-2(+)+cells+in+recent+human+CD4+T+cell+responses+to+2009+pandemic+H1N1+influenza.">Increase in IFNgamma(-)IL-2(+) cells in recent human CD4 T cell responses to 2009 pandemic H1N1 influenza.</a> PloS One. 8 (-), 57275 (2013).</li><li>Boaz, M. J., Waters, A., Murad, S., Easterbrook, P. J., Vyakarnam, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Presence+of+HIV-1+Gag-specific+IFN-gamma+IL-2++and+CD28+IL-2++CD4+T+cell+responses+is+associated+with+nonprogression+in+HIV-1+infection.">Presence of HIV-1 Gag-specific IFN-gamma+IL-2+ and CD28+IL-2+ CD4 T cell responses is associated with nonprogression in HIV-1 infection.</a> Journal of Immunology. 169 (11), 6376-6385 (2002).</li><li>Gui, L., 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=IL-2,+IL-4,+IFN-gamma+or+TNF-alpha+enhances+BAFF-stimulated+cell+viability+and+survival+by+activating+Erk1/2+and+S6K1+pathways+in+neoplastic+B-lymphoid+cells.">IL-2, IL-4, IFN-gamma or TNF-alpha enhances BAFF-stimulated cell viability and survival by activating Erk1/2 and S6K1 pathways in neoplastic B-lymphoid cells.</a> Cytokine. 84, 37-46 (2016).</li><li>Terahara, 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=Vaccine-induced+CD107a++CD4++T+cells+are+resistant+to+depletion+following+AIDS+virus+infection.">Vaccine-induced CD107a+ CD4+ T cells are resistant to depletion following AIDS virus infection.</a> Journal of Virology. 88 (24), 14232-14240 (2014).</li><li>Tanyi, J. L., 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=Personalized+cancer+vaccine+strategy+elicits+polyfunctional+T+cells+and+demonstrates+clinical+benefits+in+ovarian+cancer.">Personalized cancer vaccine strategy elicits polyfunctional T cells and demonstrates clinical benefits in ovarian cancer.</a> NPJ Vaccines. 6 (1), 36 (2021).</li><li>Ammirati, E., 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=Effector+memory+T+cells+are+associated+with+atherosclerosis+in+humans+and+animal+models.">Effector memory T cells are associated with atherosclerosis in humans and animal models.</a> Journal of the American Heart Association. 1 (1), 27-41 (2012).</li><li>Rizk, N. M., Fadel, A., AlShammari, W., Younes, N., Bashah, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+immunophenotyping+changes+of+peripheral+CD4++T+lymphocytes+and+inflammatory+markers+of+class+III+obesity+subjects+after+laparoscopic+gastric+sleeve+surgery+-+A+follow-up+study.">The immunophenotyping changes of peripheral CD4+ T lymphocytes and inflammatory markers of class III obesity subjects after laparoscopic gastric sleeve surgery - A follow-up study.</a> Journal of Inflammation Research. 14, 1743-1757 (2021).</li><li>Zhang, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Phenotypic+and+functional+characterizations+of+CD8(+)+T+cell+populations+in+malignant+pleural+effusion.">Phenotypic and functional characterizations of CD8(+) T cell populations in malignant pleural effusion.</a> Experimental Cell Research. 417 (1), 113212 (2022).</li><li>Shin, H., Iwasaki, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tissue-resident+memory+T+cells.">Tissue-resident memory T cells.</a> Immunological Reviews. 255 (1), 165-181 (2013).</li><li>Birnie, K. A., Noel, M., Chambers, C. T., Uman, L. S., Parker, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Psychological+interventions+for+needle-related+procedural+pain+and+distress+in+children+and+adolescents.">Psychological interventions for needle-related procedural pain and distress in children and adolescents.</a> Cochrane Database of Systematic Reviews. 10 (10), (2018).</li><li>Lin, R. J., Liao, C. L., Lin, Y. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Replication-incompetent+virions+of+Japanese+encephalitis+virus+trigger+neuronal+cell+death+by+oxidative+stress+in+a+culture+system.">Replication-incompetent virions of Japanese encephalitis virus trigger neuronal cell death by oxidative stress in a culture system.</a> Journal of General Virology. 85, 521-533 (2004).</li><li>Byford, E., Carr, M., Pinon, L., Ahearne, M. J., Wagner, S. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+of+CD4++T-cells+and+analysis+of+circulating+T-follicular+helper+(cTfh)+cell+subsets+from+peripheral+blood+using+6-color+flow+cytometry.">Isolation of CD4+ T-cells and analysis of circulating T-follicular helper (cTfh) cell subsets from peripheral blood using 6-color flow cytometry.</a> Journal of Visualized Experiments. (143), e58431 (2019).</li><li>Zheng, X., 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=Immune+responses+and+protective+effects+against+Japanese+encephalitis+induced+by+a+DNA+vaccine+encoding+the+prM/E+proteins+of+the+attenuated+SA14-14-2+strain.">Immune responses and protective effects against Japanese encephalitis induced by a DNA vaccine encoding the prM/E proteins of the attenuated SA14-14-2 strain.</a> Infection, Genetics and Evolution. 85, 104443 (2020).</li><li>Zheng, X., 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=Complete+protection+for+mice+conferred+by+a+DNA+vaccine+based+on+the+Japanese+encephalitis+virus+P3+strain+used+to+prepare+the+inactivated+vaccine+in+China.">Complete protection for mice conferred by a DNA vaccine based on the Japanese encephalitis virus P3 strain used to prepare the inactivated vaccine in China.</a> Virology Journal. 17 (1), 126 (2020).</li><li>Lam, J. K. 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=Emergence+of+CD4++and+CD8++polyfunctional+T+cell+responses+against+immunodominant+lytic+and+latent+EBV+antigens+in+children+with+primary+EBV+infection.">Emergence of CD4+ and CD8+ polyfunctional T cell responses against immunodominant lytic and latent EBV antigens in children with primary EBV infection.</a> Frontiers in Microbiology. 9, 416 (2018).</li><li>Meckiff, B. 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=Imbalance+of+regulatory+and+cytotoxic+SARS-CoV-2-reactive+CD4(+)+T+cells+in+COVID-19.">Imbalance of regulatory and cytotoxic SARS-CoV-2-reactive CD4(+) T cells in COVID-19.</a> Cell. 183 (5), 1340-1353 (2020).</li><li>Ning, R. J., Xu, X. Q., Chan, K. H., Chiang, A. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Long-term+carriers+generate+Epstein-Barr+virus+(EBV)-specific+CD4(+)+and+CD8(+)+polyfunctional+T-cell+responses+which+show+immunodominance+hierarchies+of+EBV+proteins.">Long-term carriers generate Epstein-Barr virus (EBV)-specific CD4(+) and CD8(+) polyfunctional T-cell responses which show immunodominance hierarchies of EBV proteins.</a> Immunology. 134 (2), 161-171 (2011).</li></ol>

This protocol represents a feasible flow cytometry-based detection method for TPF profiles in the PBMCs of children vaccinated with the JEV vaccine SA14-14-2. This study used the venous blood PBMCs of both vaccinated and unvaccinated children as research materials. With the stimulation of PBMCs with the JEV antigen, those amplified antigen-specific TPFs can be characterized by multicolor flow cytometry antibody staining. Compared with the conventional enzyme-linked immunospot assay method, flow cyto...

Japanese encephalitis virus (JEV) is an important mosquito-borne virus belonging to the genus Flavivirus within the Flaviviridae&#160;family1. Many Asia-Pacific countries have long faced enormous public health challenges due to the huge disease burden caused by Japanese encephalitis (JE), but this has improved dramatically with the increasing availability of various types of vaccinations2. Adaptive protective immune responses evoked by natural infection or vaccination contribute to the prevention and antiviral regulation. Humoral immunity and cell-mediated immunity are classified as adaptive immunity, and the induction of the former has always been regarded as a key strategy in vaccine design, albeit with relatively limited understanding in the past3. However, the role of T cell-mediated immunity in limiting flavivirus dissemination and virus clearance has been increasingly focused on and extensively studied4. Furthermore, T cell immunity is not only indispensable in JEV-specific antiviral responses but also plays a prominent role in cross-protection from secondary infection with heterologous flaviviruses, which has been demonstrated in previous studies5. It is speculated that this effect may bypass potential antibody-mediated enhancement effects in infection5. Of note, such cross-reactive T cell immunity is important, especially in the absence of vaccines and antiviral drugs against flaviviruses. Although many studies have been performed to determine the contribution of T cells in JEV infection with respect to CD4+ and CD8+ T cells6,7, the respective lineages secreting cytokines and their functional diversification remain undetermined, which means the elucidation of the exact functions of helper and killer T cells is hindered.
The scale of their antiviral defenses determines the quality of T cell responses. CD4+ or CD8+ T cells that can compatibly confer two or more functions, including cytokine secretion and degranulation, are characterized as polyfunctional T cells&#160;(TPFs)&#160;upon specific stimulation at the single-cell level8. CD4+ T cells that produce single or multiple cytokines may have various effects and immune memories. For example, IL-2+ IFN-&#947;+ CD4+ T cells are more likely to form a long-term effective protective response than IL-2+ CD4+ T cells9, which can be used as an important parameter in evaluating the vaccination effect. The frequency of IL-2+ IFN-&#947;+ CD4+ T cells is increased in patients with long-term non-progression of acquired immune deficiency syndrome (AIDS), while CD4+ T cells in patients with AIDS progression are more inclined to produce IFN-&#947; alone due to the promoting effect of IL-2 on T cell proliferation10. Furthermore, a subset of IL-2+ IFN-&#947;+ TNF-&#945;+ was shown to survive long-term in vivo and synergistically promote the killing function11. Although CD8+ T cells are more likely to exhibit cytotoxic activity, some CD4+ T cells are also equipped with cytotoxic activity as an indirectly detected expression of surface CD107a molecules12. In addition, certain T cell subsets express the chemokine MIP-1&#945;, which is often secreted by monocytes to participate in T cell-mediated neutrophil recruitment13. Similarly, CD8+ TPFs can also be used to characterize the versatility of the above markers. Studies have shown that the prime-boost strategy can effectively induce a prolonged period of TPF protective effects13, which can enhance the protection elicited by vaccination. A central feature in examining the immune system is the ability of memory T cells to facilitate stronger, faster, and more effective responses to secondary viral challenges than na&#239;ve T cells. Effector memory T cells (TEM) and central memory T cells (TCM) are important T cell subsets that are often differentiated by the composite expression of CD27/CD45RO or CCR7/CD45RA14. TCM (CD27+ CD45RO+ or CCR7+ CD45RA-) tends to localize in secondary lymphoid tissues, while TEM (CD27- CD45RO+ or CCR7- CD45RA-) localizes in lymphoid and peripheral tissues15,16. TEM provides immediate but not sustained defense, whereas TCM sustains the response by proliferating in the secondary lymphoid organs and generating new effectors17. Thus, given that memory cells can mediate specific and efficient recall responses to viruses, questions arise about the contribution of this subset of polyfunctions.
With the development of flow cytometry technology, it has become common to simultaneously detect markers of more than 10 clusters, phenotypes, and differentiation antigens, which is beneficial to more abundantly annotate the functional immunological features on individual T cells to reduce misinterpretation and difficulties in understanding of T cell phenotypes. This study used ex vivo stimulation and flow cytometry to analyze TPF profiles in peripheral blood mononuclear cells (PBMCs) within JEV-vaccinated children. Applying this approach, the understanding of short- and long-term JEV-specific and even cross-reactive T cell immunity induced by vaccination will be expanded.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>anti-human CD28</td>
			<td>Biolegend</td>
			<td>302934</td>
			<td>Antibody</td>
		</tr>
		<tr>
			<td>anti-human CD49d</td>
			<td>Biolegend</td>
			<td>304339</td>
			<td>Antibody</td>
		</tr>
		<tr>
			<td>APC anti-human MIP-1&#945;</td>
			<td>BD</td>
			<td>551533</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>Automated cell counter</td>
			<td>BIO RAD</td>
			<td>TC20</td>
			<td>Cell count</td>
		</tr>
		<tr>
			<td>BD FACSymphony A5</td>
			<td>BD</td>
			<td>A5</td>
			<td>flow Cytometry</td>
		</tr>
		<tr>
			<td>BUV395 anti-human CD4</td>
			<td>BD</td>
			<td>563550</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BUV737 anti-human CCR7</td>
			<td>BD</td>
			<td>741786</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BUV737 anti-human CD27</td>
			<td>BD</td>
			<td>612829</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BV421 anti-human CD8</td>
			<td>Biolegend</td>
			<td>344748</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BV480 anti-human CD45RA</td>
			<td>BD</td>
			<td>566114</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BV480 anti-human CD45RO</td>
			<td>BD</td>
			<td>566143</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BV605 anti-human CD107a</td>
			<td>Biolegend</td>
			<td>328634</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BV650 anti-human CD3</td>
			<td>BD</td>
			<td>563999</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>BV785 anti-human IL-2</td>
			<td>Biolegend</td>
			<td>500348</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>Centrifuge Tube</td>
			<td>BD Falcon</td>
			<td>BD-35209715</td>
			<td>15 mL centrifuge tube</td>
		</tr>
		<tr>
			<td>Cytofix/Cytoperm Fixation/Permeabilization Solution Kit</td>
			<td>BD</td>
			<td>554714</td>
			<td>Cell fixation and permeabilization</td>
		</tr>
		<tr>
			<td>Density gradient medium</td>
			<td>Dakewe</td>
			<td>DKW-KLSH-0100</td>
			<td>Ficoll-Paque, human lymphocyte separation medium</td>
		</tr>
		<tr>
			<td>FITC anti-human IFN-&#947;</td>
			<td>Biolegend</td>
			<td>502506</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>Gibco Fetal Bovine Serum</td>
			<td>Thermo Fisher Scientific</td>
			<td>16000-044</td>
			<td>Fetal Bovine Serum</td>
		</tr>
		<tr>
			<td>Gibco RPMI-1640 medium</td>
			<td>Thermo Fisher Scientific</td>
			<td>22400089</td>
			<td>cell culture medium</td>
		</tr>
		<tr>
			<td>High-speed&#160;centrifuge</td>
			<td>Sigma</td>
			<td>&#160;3K15</td>
			<td>Cell centrifugation for 15 mL centrifuge tube</td>
		</tr>
		<tr>
			<td>High-speed&#160;centrifuge</td>
			<td>Eppendorf</td>
			<td>5424R</td>
			<td>Cell centrifugation for 1.5 mL Eppendorf (EP) tube</td>
		</tr>
		<tr>
			<td>Microcentrifuge tubes</td>
			<td>Axygen</td>
			<td>MCT-150-C</td>
			<td>1.5 mL microcentrifuge tube</td>
		</tr>
		<tr>
			<td>PE anti-human TNF-&#945;</td>
			<td>Biolegend</td>
			<td>502909</td>
			<td>Fluorescent antibody&#160;</td>
		</tr>
		<tr>
			<td>Phosphate Buffered Saline (PBS)</td>
			<td>BI</td>
			<td>02-024-1ACS</td>
			<td>PBS</td>
		</tr>
		<tr>
			<td>Protein Transport Inhibitor (Containing Brefeldin A, GolgiPlug)</td>
			<td>BD</td>
			<td>555029</td>
			<td>blocks intracellular protein transport processes</td>
		</tr>
		<tr>
			<td>Protein Transport Inhibitor (Containing Monensin)</td>
			<td>BD</td>
			<td>554724</td>
			<td>blocks intracellular protein transport processes</td>
		</tr>
		<tr>
			<td>Round-bottom test tube</td>
			<td>BD Falcon</td>
			<td>352235</td>
			<td>5 mL test tube</td>
		</tr>
		<tr>
			<td>Trypan Blue Staining Cell Viability Assay Kit</td>
			<td>Beyotime</td>
			<td>C0011</td>
			<td>Trypan Blue Staining</td>
		</tr>
		<tr>
			<td>Zombie NIR Fixable Viability Dye</td>
			<td>Biolegend</td>
			<td>423106</td>
			<td>Dead cell stain</td>
		</tr>
	</tbody>
</table>

detection of polyfunctional t cells in children vaccinated with japanese encephalitis vaccine via the flow cytometry technique

T cell-mediated immunity plays an important role in controlling flavivirus infection, either after vaccination or after natural infection. The "quality" of a T cell needs to be assessed by function, and higher function is associated with more powerful immune protection. T cells that can simultaneously produce two or more cytokines or chemokines at the single-cell level are called polyfunctional T cells (TPFs), which mediate immune responses through a variety of molecular mechanisms to express degranulation markers (CD107a) and secrete interferon (IFN)-&#947;, tumor necrosis factor (TNF)-&#945;, interleukin (IL)-2, or macrophage inflammatory protein (MIP)-1&#945;. There is increasing evidence that TPFs are closely related to the maintenance of long-term immune memory and protection and that their increased proportion is an important marker of protective immunity and is important in the effective control of viral infection and reactivation. This evaluation applies not only to specific immune responses but also to the assessment of cross-reactive immune responses. Here, taking the Japanese encephalitis virus (JEV) as an example, the detection method and flow cytometry color scheme of JEV-specific TPFs produced by peripheral blood mononuclear cells of children vaccinated against Japanese encephalitis were tested to provide a reference for similar studies.

Figure 1 shows&#160;the gating strategy used to divide the TCM or TEM of&#160;CD8+ or CD4+ T cells from a representative JEV stimulation group of JE-vaccinated children. The FSC-A/SSC-A dot plot is used to identify lymphocytes, and the FSC-A/FSC-W dot plot is used to identify single cells. Viable cells are selected on the live/dead/SSC-A dot plot. The CD3/SSC-A dot plot is used to identify the CD3+ T cells. The CD4/CD8 dot plot is used t...

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Detection of Polyfunctional T Cells in Children Vaccinated with Japanese Encephalitis Vaccine via the Flow Cytometry Technique

The present protocol combines ex vivo stimulation and flow cytometry to analyze polyfunctional T cell (TPF)&#160;profiles in peripheral blood mononuclear cells (PBMCs) within Japanese encephalitis virus (JEV)-vaccinated children. The detection method and flow cytometry color scheme of JEV-specific TPFs were tested to provide a reference for similar studies.

Detection of Polyfunctional T Cells in Children Vaccinated with Japanese Encephalitis Vaccine via the Flow Cytometry Technique

T cell-mediated immunity plays an important role in controlling flavivirus infection, either after vaccination or after natural infection. The "quality" ...

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JoVE Journal

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