SARS-CoV-2尖端与T细胞受体没有相互作用,也没有直接激活T细胞
Stephanie A Gaglione1,2, Tatiana J Rosales3,4, Laura Schmidt-Hong2,5
1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
概括
在SARS-CoV-2的尖端蛋白似乎不作为一个超抗原. 实验表明,尖端蛋白与T细胞受体 (TCR) 之间没有直接结合,反驳了超抗原活性.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 分子生物学分子生物学
背景情况:
- 感染SARS-CoV-2可以引发儿童多系统炎症综合征 (MIS-C).
- MIS-C与超抗原诱导的毒性休克综合征有相似之处.
- 假设SARS-CoV-2尖峰 (S) 蛋白质可以作为超抗原,结合T细胞受体 (TCRs) 来诱导T细胞反应.
研究的目的:
- 研究SARS-CoV-2尖端蛋白与T细胞受体 (TCR) 之间的直接相互作用.
- 通过实验来确定SARS-CoV-2尖端蛋白是否具有超抗原性质.
主要方法:
- 计算建模以确定S蛋白上潜在的TCR结合位点.
- 表面等离子体共振 (SPR) 检测重组S蛋白和TCR之间的直接结合.
- 伪型的lentivirus试验评估了S蛋白与CD8+T细胞的相互作用.
主要成果:
- 使用SPR.的SARS-CoV-2 S蛋白和TCR之间没有观察到可检测的结合.
- 用S蛋白伪型的lentivirus没有转导,激活或刺激CD8+T细胞的增殖.
- 计算机建模表明了潜在的结合点,但实验数据不支持直接的TCR参与.
结论:
- 在SARS-CoV-2的尖端蛋白不太可能作为一个超抗原.
- 尖端蛋白质对T细胞受体的直接,非特异性接触没有得到实验证据的支持.
- 建议的SARS-CoV-2诱导的T细胞反应的超抗原机制不太可能.
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