SARS-CoV-2 Infection Influences Wnt/β-Catenin Pathway Components in Astrocytes.

The mechanisms by which SARS-CoV-2 infection lead to neuroinflammation and cognitive impairment in COVID-19 and Long COVID are unclear. Cerebrovascular Wnt/β-catenin pathway activity is suppressed in association with neuroinflammation and cognitive impairment in a mouse model of COVID-19. In this study, we asked whether SARS-CoV-2 (NY Iota strain) infection of astrocytes would result in cell-autonomous changes in Wnt/β-catenin pathway components. We report that induced pluripotent stem cell (hiPSC)-derived human astrocytes (iAs) are susceptible to sustained infection with SARS-CoV-2 in vitro. Real-time PCR revealed that SARS-CoV-2 infection of iAs decreased transcripts for Wnt3a, Wnt10b, and the downstream pathway effectors β-catenin and TCF3. Wnt7b was increased, as was the proinflammatory chemokine CXCL10. No changes were noted in Wnt3, Wnt7a, TCF1, TCF4, or LEF1. These data indicate that SARS-CoV-2 infection differentially influences Wnt/β-catenin pathway components in astrocytes. These data could have implications for the mechanistic basis of COVID-19 and Long COVID.