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• W4366587932 abstract "Abstract Background The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) causes non-symptomatic infection, mild influenza-like symptoms to pneumonia, severe acute respiratory distress syndrome, and even death, reflecting different clinical symptoms of viral infection. However, the mechanism of its pathogenicity remains unclear. Host-specific traits have a breakthrough significance for studying the pathogenicity of SARS-CoV-2. We previously reported SARS-CoV-2/BMA8, a mouse-adapted strain, was lethal to aged BALB/c mice but not to aged C57BL/6N mice. Here, we further investigate the differences in pathogenicity of BMA8 strain against wild-type aged C57BL/6N and BALB/c mice. Methods Whole blood and tissues were collected from mice before and after BMA8 strain infection. Viral replication and infectivity were assessed by detection of viral RNA copies and viral titers; the degree of inflammation in mice was tested by whole blood cell count, ELISA and RT-qPCR assays; the pathogenicity of SARS-CoV-2/BMA8 in mice was measured by Histopathology and Immunohistochemistry; and the immune level of mice was evaluated by flow cytometry to detect the number of CD8 + T cells. Results Our results suggest that SARS-CoV-2/BMA8 strain caused lower pathogenicity and inflammation level in C57BL/6N mice than in BALB/c mice. Interestingly, BALB/c mice whose MHC class I haplotype is H-2K d showed more severe pathogenicity after infection with BMA8 strain, while blockade of H-2K b in C57BL/6N mice was also able to cause this phenomenon. Furthermore, H-2K b inhibition increased the expression of cytokines/chemokines and accelerated the decrease of CD8 + T cells caused by SARS-CoV-2/BMA8 infection. Conclusions Taken together, our work shows that host MHC molecules play a crucial role in the pathogenicity differences of SARS-CoV-2/BMA8 infection. This provides a more profound insight into the pathogenesis of SARS-CoV-2, and contributes enlightenment and guidance for controlling the virus spread." @default.
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• W4366587932 date "2023-04-20" @default.
• W4366587932 modified "2023-09-26" @default.
• W4366587932 title "MHC class I links with severe pathogenicity in C57BL/6N mice infected with SARS-CoV-2/BMA8" @default.
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• W4366587932 doi "https://doi.org/10.1186/s12985-023-02031-0" @default.
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