부산대학교 도서관

Since its emergence in December 2019, Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) has spread globally and become a major public health burden. Despite its close phylogenetic relationship to SARS-CoV, SARS-CoV-2 exhibits increased human-to-human transmission dynamics, likely due to efficient early replication in the upper respiratory epithelium of infected individuals. Since different temperatures encountered in the human upper and lower respiratory tract (37°C and 33°C, respectively) have been shown to affect the replication kinetics of several respiratory viruses, as well as host immune response dynamics, we investigated the impact of temperatures during SARS-CoV-2 and SARS-CoV infection using the primary human airway epithelial cell culture model. SARS-CoV-2, in contrast to SARS-CoV, replicated to higher titers when infections were performed at 33°C rather than 37°C. Although both viruses were highly sensitive to type I and type III interferon pretreatment, a detailed time-resolved transcriptome analysis revealed temperature-dependent interferon and pro-inflammatory responses specifically induced by SARS-CoV or SARS-CoV-2, which amplitude was inversely proportional to their replication efficiencies at 33°C or 37°C. These data provide crucial insight on pivotal virus–host interaction dynamics and are in line with characteristic clinical features of SARS-CoV-2 and SARS-CoV, as well as their respective transmission efficiencies. The temperature in the lower respiratory tract is higher than in the upper respiratory tract. This study compares the viral replication kinetics and host cell response during SARS-CoV-2 and SARS-CoV infection, finding that the temperature of the human respiratory epithelium influences the viral replication and virus-host dynamics of SARS-CoV-2, but not of SARS-CoV. [ABSTRACT FROM AUTHOR]