Degranulation of natural killer cells following interaction with HIV-1-infected cells is hindered by downmodulation of NTB-A by Vpu.

Degranulation of natural killer cells following interaction with HIV-1-infected cells is hindered by downmodulation of NTB-A by Vpu.
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DOI:
10.1016/j.chom.2010.10.008
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发表时间:
2010-11-18
影响因子:
30.3
通讯作者:
Barker E
Barker E
中科院分区:
医学1区
文献类型:
--
作者:
Shah AH;Sowrirajan B;Davis ZB;Ward JP;Campbell EM;Planelles V;Barker E

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自然杀伤(NK)细胞对病毒感染细胞的反应是由不变的NK细胞表面受体及其靶细胞上的配体之间的相互作用触发的。尽管HIV-1VPR可诱导感染细胞表达NK细胞激活受体NKG2D的配体,但这不足以促进溶解颗粒的释放。我们发现,与NKG2D一起触发NK细胞共激活受体NK-T-和B细胞抗原(NTB-A)可促进NK细胞脱颗粒。正常情况下,NK细胞表面的NTB-A与CD4+T细胞上的NTB-A结合。然而,HIV-1VPU下调受感染T细胞上的NTB-A。VPU通过跨膜区与NTB-A结合,而不促进NTB-A的降解。感染HIV-1VPU突变体的细胞比野生型病毒诱导的NK细胞脱颗粒至少多50%。此外,NK细胞具有较高的裂解突变VPU的HIV感染细胞的能力。因此,VPU下调NTB-A可以保护感染细胞免受NK细胞的裂解。
Natural killer (NK) cell degranulation in response to virus-infected cells is triggered by interactions between invariant NK cell surface receptors and their ligands on target cells. Although HIV-1 Vpr induces expression of ligands for NK cell activation receptor, NKG2D, on infected cells, this is not sufficient to promote lytic granule release. We show that triggering the NK cell coactivation receptor NK-T-and -B cell antigen (NTB-A) alongside NKG2D promotes NK cell degranulation. Normally, NK cell surface NTB-A binds to NTB-A on CD4+ T cells. However, HIV-1 Vpu downmodulates NTB-A on infected T cells. Vpu associates with NTB-A through its trans-membrane region without promoting NTB-A degradation. Cells infected with HIV-1 Vpu mutant elicited at least 50% more NK cells to degranulate than wild-type virus. Moreover, NK cells have a higher capacity to lyse HIV-infected cells with a mutant Vpu. Thus, Vpu downmodulation of NTB-A protects the infected cell from lysis by NK cells.
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