Differential presentation of endogenous and exogenous hepatitis B surface antigens influences priming of CD8+ T cells in an epitope‐specific manner

Differential presentation of endogenous and exogenous hepatitis B surface antigens influences priming of CD8+ T cells in an epitope‐specific manner
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内源性和外源性乙型肝炎表面抗原的差异呈现以表位特异性方式影响 CD8 T 细胞的启动

DOI:
10.1002/eji.201343933
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发表时间:
1981
影响因子:
5.4
通讯作者:
Schirmbeck R
Schirmbeck R
中科院分区:
医学3区
文献类型:
--
作者:
Riedl P;Reiser M;Stifter K;Krieger J;Schirmbeck R

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内源性和外源性乙型肝炎病毒(HBV)表面抗原在疫苗和/或病毒包藏肝细胞靶向的APCs上是否会影响CD8+T细胞的从头启动,目前尚不清楚。我们发现,表面抗原表达的转染只显示Kb/S190表位,而重组表面颗粒(rSPs)脉冲的细胞只向CD8+T细胞显示Kb/S208表位。这些表位的差异表现在很大程度上反映了内源性/DNA或外源性/蛋白疫苗分别选择性地(但不是排他性地)引发C57BL/6小鼠中Kb/S190‐和Kb/S208‐特异性T细胞。在抗原表达载体中沉默Kb/S190表位(Kb/S190V194F)可以挽救Kb/S208表位在稳定的转染物中的提呈,并显著增强C57BL/6小鼠中Kb/S208特异性T细胞的启动。Kb/S190介导的免疫优势作用于表面抗原表达细胞,而不作用于rSP脉冲细胞,导致Kb/S208表位的有效抑制,从而减少Kb/S208特异性T细胞的启动。这种Kb/S190介导的免疫优势也适用于选择性表达内源性表面抗原的1.4HBV‐smutg转基因(tg)肝细胞,并允许在1.4HBV‐smutg小鼠中启动Kb/S208‐而不是Kb/S190‐特异性T细胞。然而,IFN‐γ+Kb/S208‐特异性T细胞不能抑制1.4HBV‐Smuttg小鼠肝脏中的HBV复制。这些结果对T细胞刺激治疗性疫苗的设计具有实际意义。
Little is known about whether presentation of endogenous and exogenous hepatitis B virus (HBV) surface antigens on APCs targeted by vaccination and/or virus‐harboring hepatocytes influences de novo priming of CD8+T cells. We showed that surface antigen‐expressing transfectants exclusively display a Kb/S190 epitope, whereas cells pulsed with recombinant surface particles (rSPs) exclusively present a Kb/S208 epitope to CD8+T cells. The differential presentation of these epitopes largely reflects the selective, but not exclusive, priming of Kb/S190‐ and Kb/S208‐specific T cells in C57BL/6 mice by endogenous/DNA‐ or exogenous/protein‐based vaccines, respectively. Silencing the Kb/S190 epitope (Kb/S190V194F) in antigen‐expressing vectors rescued the presentation of the Kb/S208 epitope in stable transfectants and significantly enhanced priming of Kb/S208‐specific T cells in C57BL/6 mice. A Kb/S190‐mediated immunodominance operating in surface antigen‐expressing cells, but not in rSP‐pulsed cells, led to an efficient suppression in the presentation of the Kb/S208 epitope and a consequent decrease in the priming of Kb/S208‐specific T cells. This Kb/S190‐mediated immunodominance also operated in 1.4HBV‐Smuttransgenic (tg) hepatocytes selectively expressing endogenous surface antigens and allowed priming of Kb/S208‐ but not Kb/S190‐specific T cells in 1.4HBV‐Smuttg mice. However, IFN‐γ+Kb/S208‐specific T cells could not inhibit HBV replication in the liver of 1.4HBV‐Smuttg mice. These results have practical implications for the design of T‐cell‐stimulating therapeutic vaccines.
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