Center for Immunology and Infectious Diseases, UC Davis, Davis, CA, USA.
Graduate Group in Immunology, UC Davis, Davis, CA, USA.
Nat Commun. 2021 Jan 22;12(1):541. doi: 10.1038/s41467-020-20642-x.
CD4 T follicular helper (T) cells are important for the generation of durable and specific humoral protection against viral infections. The degree to which SARS-CoV-2 infection generates T cells and stimulates the germinal center (GC) response is an important question as we investigate vaccine induced immunity against COVID-19. Here, we report that SARS-CoV-2 infection in rhesus macaques, either infused with convalescent plasma, normal plasma, or receiving no infusion, resulted in transient accumulation of pro-inflammatory monocytes and proliferating T cells with a T1 profile in peripheral blood. CD4 helper cell responses skewed predominantly toward a T1 response in blood, lung, and lymph nodes. SARS-CoV-2 Infection induced GC T cells specific for the SARS-CoV-2 spike and nucleocapsid proteins, and a corresponding early appearance of antiviral serum IgG antibodies. Collectively, the data show induction of GC responses in a rhesus model of mild COVID-19.
CD4 T 滤泡辅助(T)细胞对于产生针对病毒感染的持久和特异性体液保护非常重要。我们研究针对 COVID-19 的疫苗诱导免疫时,一个重要的问题是 SARS-CoV-2 感染产生的 T 细胞数量以及刺激生发中心(GC)反应的程度。在这里,我们报告在恒河猴中,SARS-CoV-2 感染无论是输注恢复期血浆、正常血浆还是未输注,都会导致外周血中促炎单核细胞和增殖 T 细胞的短暂积累,T1 表型。CD4 辅助细胞反应在血液、肺和淋巴结中主要偏向 T1 反应。SARS-CoV-2 感染诱导针对 SARS-CoV-2 刺突蛋白和核衣壳蛋白的 GC T 细胞,以及抗病毒血清 IgG 抗体的早期出现。总的来说,这些数据表明在轻度 COVID-19 的恒河猴模型中诱导了 GC 反应。
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