Impaired Priming of SARS-CoV-2-Specific Naive CD8(+) T Cells in Older Subjects.

Impaired Priming of SARS-CoV-2-Specific Naive CD8(+) T Cells in Older Subjects.
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在老年受试者中,SARS-COV-2特异性CD8(+)T细胞的启动受损。

DOI:
10.3389/fimmu.2021.693054
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发表时间:
2021
影响因子:
7.3
通讯作者:
Nicoli F
Nicoli F
中科院分区:
医学2区
文献类型:
--
作者:
Gallerani E;Proietto D;Dallan B;Campagnaro M;Pacifico S;Albanese V;Marzola E;Marconi P;Caputo A;Appay V;Gavioli R;Nicoli F

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高龄与SARS-CoV-2感染后的严重症状和死亡相关。病毒特异性CD 8 + T细胞应答已被证明对关键的COVID-19表现具有保护作用,这表明次优的细胞免疫可能有助于疾病的年龄模式。针对新出现的病原体如SARS-CoV-2的CD 8 + T细胞应答的诱导依赖于初始T细胞的活化。为了研究针对这种病毒的初级CD 8 + T细胞应答是否在老年人中存在缺陷,我们使用体外方法从不同年龄组的健康未暴露供体中引发SARS-CoV-2特异性幼稚CD 8 + T细胞。与年轻人相比,老年人在反应的幅度和质量方面显示出较差的SARS-CoV-2特异性T细胞引发能力。此外,年龄较大的受试者识别的表位数量较少。我们的研究结果表明,免疫老化与改变的主要SARS-CoV-2特异性CD 8 + T细胞反应有关。
Advanced age is associated with severe symptoms and death upon SARS-CoV-2 infection. Virus-specific CD8+ T-cell responses have shown to be protective toward critical COVID-19 manifestations, suggesting that suboptimal cellular immunity may contribute to the age-pattern of the disease. The induction of a CD8+ T-cell response against an emerging pathogen like SARS-CoV-2 relies on the activation of naive T cells. To investigate whether the primary CD8+ T-cell response against this virus is defective in advanced age, we used an in vitro approach to prime SARS-CoV-2-specific naive CD8+ T cells from healthy, unexposed donors of different age groups. Compared to younger adults, older individuals display a poor SARS-CoV-2-specific T-cell priming capacity in terms of both magnitude and quality of the response. In addition, older subjects recognize a lower number of epitopes. Our results implicate that immune aging is associated with altered primary SARS-CoV-2-specific CD8+ T-cell responses.
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