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Differential roles of RIG-I like receptors in SARS-CoV-2 infection #MMPMID34488908
Yang DM; Geng TT; Harrison AG; Wang PH
Mil Med Res 2021[Sep]; 8 (1): 49 PMID34488908show ga
Retinoic acid-inducible gene I (RIG-I) and melanoma differentiation-associated protein 5 (MDA5) sense viral RNA and activate antiviral immune responses. Herein we investigate their functions in human epithelial cells, the primary and initial target of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). A deficiency in MDA5, RIG-I or mitochondrial antiviral signaling protein (MAVS) enhanced viral replication. The expression of the type I/III interferon (IFN) during infection was impaired in MDA5(-/-) and MAVS(-/-), but not in RIG-I(-/-), when compared to wild type (WT) cells. The mRNA level of full-length angiotensin-converting enzyme 2 (ACE2), the cellular entry receptor for SARS-CoV-2, was ~ 2.5-fold higher in RIG-I(-/-) than WT cells. These data demonstrate MDA5 as the predominant SARS-CoV-2 sensor, IFN-independent induction of ACE2 and anti-SARS-CoV-2 role of RIG-I in epithelial cells.
|Adaptor Proteins, Signal Transducing/genetics/*metabolism[MESH]