SARS-CoV2 infection impairs the metabolism and redox function of cellular glutathione.
Level 5 - mechanism / opinion, no new human data
In vitro bench study in cell culture
PubMed 34146958 · doi:10.1016/j.redox.2021.102041
What was done
Researchers investigated the impact of SARS-CoV-2 infection on cellular glutathione (GSH) homeostasis in Vero E6 cell cultures during the first 24 hours post-infection. They evaluated cellular thiol levels, cysteine uptake, thiol efflux, oxidized glutathione (GSSG), protein glutathionylation, and endoplasmic reticulum stress markers (PERK), as well as the restorative effects of N-acetylcysteine (NAC) and the antiviral drugs remdesivir and nelfinavir.
What was found
The abstract reports no numerical values. SARS-CoV-2 infection markedly decreased cellular thiols (primarily reduced GSH) within 24 hours post-infection, associated with decreased cysteine uptake and increased thiol efflux. Infection also increased GSSG, protein glutathionylation, and PERK expression. Nelfinavir activated Nrf2 and synergized with NAC to restore GSH levels, while remdesivir prevented protein glutathionylation despite weaker GSH-enhancing effects.
Why it matters
The findings demonstrate a cellular mechanism whereby SARS-CoV-2 directly disrupts host redox homeostasis and depletes glutathione, providing a biological rationale for exploring antioxidant and antiviral combinations in preclinical models.
Limits
The study was conducted entirely in non-human primate cell culture (Vero E6 cells) rather than human airway epithelial models or in vivo systems. The abstract does not provide exact quantitative figures, effect sizes, or dose-response parameters.
Cited by
- supports SARS-CoV-2 viral replication requires a reduction in cellular glutathione levels.