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HIV-1 Nef protein protects infected primary cells against killing by cytotoxic T lymphocytes.

机译:HIV-1 Nef蛋白可以保护感染的原代细胞免受细胞毒性T淋巴细胞的杀伤。

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Cytotoxic T lymphocytes (CTLs) lyse virally infected cells that display viral peptide epitopes in association with major histocompatibility complex (MHC) class I molecules on the cell surface. However, despite a strong CTL response directed against viral epitopes, untreated people infected with the human immunodeficiency virus (HIV-1) develop AIDS. To resolve this enigma, we have examined the ability of CTLs to recognize and kill infected primary T lymphocytes. We found that CTLs inefficiently lysed primary cells infected with HIV-1 if the viral nef gene product was expressed. Resistance of infected cells to CTL killing correlated with nef-mediated downregulation of MHC class I and could be overcome by adding an excess of the relevant HIV-1 epitope as soluble peptide. Thus, Nef protected infected cells by reducing the epitope density on their surface. This effect of nef may allow evasion of CTL lysis by HIV-1-infected cells.
机译:细胞毒性T淋巴细胞(CTL)裂解病毒感染的细胞,这些细胞在细胞表面上与主要的组织相容性复合物(MHC)I类分子结合显示病毒肽表位。但是,尽管针对病毒表位的CTL反应强烈,但是未经治疗的感染了人类免疫缺陷病毒(HIV-1)的人仍会患上AIDS。为了解决这个难题,我们检查了CTL识别和杀死感染的原代T淋巴细胞的能力。我们发现,如果表达了病毒nef基因产物,则CTL不能有效裂解感染HIV-1的原代细胞。感染细胞对CTL杀伤的抗性与nef介导的MHC I类下调​​有关,可以通过添加过量的相关HIV-1表位作为可溶性肽来克服。因此,Nef通过降低其表面上的表位密度来保护感染的细胞。 nef的这种作用可能使被HIV-1感染的细胞逃避CTL裂解。

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