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HIV‐1 infection of CD4 T cells impairs antigen‐specific B cell function
The EMBO Journal ( IF 11.4 ) Pub Date : 2020-11-04 , DOI: 10.15252/embj.2020105594
Sheetal Kaw 1 , Swetha Ananth 1, 2 , Nikolaos Tsopoulidis 1 , Katharina Morath 1 , Bahar M Coban 1, 2 , Ralph Hohenberger 3 , Olcay C Bulut 2, 4 , Florian Klein 5, 6 , Bettina Stolp 1 , Oliver T Fackler 1, 2
Affiliation  

Failures to produce neutralizing antibodies upon HIV‐1 infection result in part from B‐cell dysfunction due to unspecific B‐cell activation. How HIV‐1 affects antigen‐specific B‐cell functions remains elusive. Using an adoptive transfer mouse model and ex vivo HIV infection of human tonsil tissue, we found that expression of the HIV‐1 pathogenesis factor NEF in CD4 T cells undermines their helper function and impairs cognate B‐cell functions including mounting of efficient specific IgG responses. NEF interfered with T cell help via a specific protein interaction motif that prevents polarized cytokine secretion at the T‐cell–B‐cell immune synapse. This interference reduced B‐cell activation and proliferation and thus disrupted germinal center formation and affinity maturation. These results identify NEF as a key component for HIV‐mediated dysfunction of antigen‐specific B cells. Therapeutic targeting of the identified molecular surface in NEF will facilitate host control of HIV infection.

中文翻译:

CD4 T 细胞的 HIV-1 感染会损害抗原特异性 B 细胞功能

感染 HIV-1 后不能产生中和抗体的部分原因是由于非特异性 B 细胞激活导致的 B 细胞功能障碍。HIV-1 如何影响抗原特异性 B 细胞功能仍然难以捉摸。使用过继转移小鼠模型和离体HIV 感染人类扁桃体组织后,我们发现 CD4 T 细胞中 HIV-1 发病因子 NEF 的表达破坏了它们的辅助功能并损害了同源 B 细胞功能,包括产生有效的特异性 IgG 反应。NEF 通过特定的蛋白质相互作用基序干扰 T 细胞的帮助,该基序阻止 T 细胞-B 细胞免疫突触处的极化细胞因子分泌。这种干扰降低了 B 细胞的活化和增殖,从而破坏了生发中心的形成和亲和力成熟。这些结果将 NEF 确定为 HIV 介导的抗原特异性 B 细胞功能障碍的关键成分。NEF 中已识别分子表面的治疗靶向将有助于宿主控制 HIV 感染。
更新日期:2020-12-15
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