Dendritic cells pulsed with exogenous hepatitis B surface antigen particles efficiently present epitopes to MHC class I‐restricted cytotoxic T cells

Dendritic cells pulsed with exogenous hepatitis B surface antigen particles efficiently present epitopes to MHC class I‐restricted cytotoxic T cells
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用外源乙型肝炎表面抗原颗粒脉冲的树突状细胞有效地将表位呈递给 MHC I 类限制性细胞毒性 T 细胞

DOI:
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发表时间:
2002
影响因子:
5.4
通讯作者:
R. Schirmbeck
R. Schirmbeck
中科院分区:
医学3区
文献类型:
--
作者:
Detlef Stober<;Z. Trobonjača;J. Reimann;R. Schirmbeck

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通过外源性乙型肝炎表面抗原(HBsAg)脉冲的小鼠树突状细胞(DC)处理的Ld -和Kb -结合表位被呈递到细胞毒性T淋巴细胞(CTL)。代谢活性DC对CTL中IFN - γ释放和细胞毒性的特异性和剂量依赖性诱导不依赖于污染颗粒的抗原肽,具有细胞松弛素D抗性,与DC的成熟状态无关,并被伯氨喹、氨酰和NH4Cl阻断(表明参与了酸性蛋白水解)。脉冲DC的特异性免疫刺激表型在脉冲结束后维持约3小时,但随后迅速衰减。通过脉冲DC处理外源HBsAg颗粒中的Ld -和Kb -结合表位是与TAP无关的。表面相关的“空”64+ Ld分子(由mAb 64‐3‐7定义),而非三聚体(由mAb 30‐5‐7定义)30+ Ld分子(由mAb 30‐5‐7定义)必须在DC与外源HBsAg颗粒脉冲期间可用,以产生30+ ld分子,呈递抗原S28-39肽。外源性β2微球蛋白在DC与HBsAg颗粒的脉冲中存在,促进了Ld -和Kb -限制性表位的呈现。骨髓祖细胞体外生成的DC,以及脾DC和肝DC(体内生成)均具有特异性CTL的表位。因此,HBsAg颗粒在DC中有效地进入另一种加工途径,导致表位呈递到MHC I类限制性CTL。
Ld‐ and Kb‐binding epitopes processed by murine dendritic cells (DC) pulsed with exogenous, particulate hepatitis B surface antigen (HBsAg) are presented to cytotoxic T lymphocytes (CTL). The specific and dose‐dependent induction of IFN‐γ release and cytotoxicity in CTL by metabolically active DC did not depend on antigenic peptides contaminating the particles, was cytochalasin D resistant, independent of the maturation state of DC, and blocked by primaquine, amiloride and NH4Cl (indicating involvement of acid proteolysis). The specific immunostimulatory phenotype of pulsed DC was maintained for about 3 h after the end of the pulse but rapidly decayed thereafter. Processing of Ld‐ and Kb‐binding epitopes from exogenous HBsAg particles by pulsed DC for presentation was TAP independent. Surface‐associated ‘empty’ (presentation‐deficient) 64+ Ld molecules (defined by the mAb 64‐3‐7), but not trimeric (presentation‐competent) 30+ Ld molecules (defined by the mAb 30‐5‐7) had to be available during the pulse of DC with exogenous HBsAg particles to generate 30+ Ldmolecules that present the antigenic S28–39 peptide. Exogenous β2‐microglobulin present during the pulse of DC with HBsAg particles facilitated presentation of Ld‐ and Kb‐restricted epitopes. DC generated from bone marrow progenitors in vitro, as well as splenic and liver DC (generated in vivo) presented epitopes to specific CTL. HBsAg particles thus efficiently enter an alternative processing pathway in DC that leads to presentation of epitopes to MHC class I‐restricted CTL.
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