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SARS-CoV-2-triggered mast cell rapid degranulation induces alveolar epithelial inflammation and lung injury

Signal Transduct Target Ther. 2021-12; 
Meng-Li Wu, Feng-Liang Liu, Jing Sun, Xin Li, Xiao-Yan He, Hong-Yi Zheng, Yan-Heng Zhou, Qihong Yan, Ling Chen, Guo-Ying Yu, Junbiao Chang, Xia Jin, Jincun Zhao, Xin-Wen Chen, Yong-Tang Zheng, Jian-Hua Wang
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Proteins, Expression, Isolation and Analysis LAD2 cells (3 × 105) were incubated with Spike-RBD protein (5 μg/mL, Genscript, Z03483) in adherent buffer (1 mM CaCl2 Get A Quote


SARS-CoV-2 infection-induced hyper-inflammation links to the acute lung injury and COVID-19 severity. Identifying the primary mediators that initiate the uncontrolled hypercytokinemia is essential for treatments. Mast cells (MCs) are strategically located at the mucosa and beneficially or detrimentally regulate immune inflammations. In this study, we showed that SARS-CoV-2-triggered MC degranulation initiated alveolar epithelial inflammation and lung injury. SARS-CoV-2 challenge induced MC degranulation in ACE-2 humanized mice and rhesus macaques, and a rapid MC degranulation could be recapitulated with Spike-RBD binding to ACE2 in cells; MC degranulation altered various signaling pathways in alveolar epithelia... More