Sulforaphane's Nuclear Factor Erythroid 2-Related Factor 2 (Nrf2)-Dependent and -Independent Mechanism of Anti-SARS-CoV-2 Activity.
Level 5 - mechanism / opinion, no new human data
Preclinical in vitro and mouse model study without human participants
PubMed 39220635 · doi:10.35534/jrbtm.2024.10010
What was done
Researchers evaluated the role of Nrf2 and five Nrf2 modulators against SARS-CoV-2 using two mouse infection models (including the MA30 model) and two Nrf2 knockout cell lines. They assessed viral load, inflammatory responses, viral entry, and main protease (Mpro / Nsp5) inhibition using two protease assays.
What was found
The absence of Nrf2 in mouse models significantly increased SARS-CoV-2 viral load and altered inflammatory responses. Among five modulators tested, epigallocatechin gallate (EGCG), dimethyl fumarate (DMF), and sulforaphane (SFN) demonstrated significant antiviral effects, with SFN being the most effective. SFN did not block viral entry but inhibited Mpro. In vitro, SFN antiviral activity was retained in Nrf2 knockout cell lines. In vivo in the MA30 mouse model, SFN antiviral function was completely lost in Nrf2 knockout mice. The abstract reports no numerical values, concentrations, or statistical metrics.
Why it matters
The study demonstrates that while sulforaphane inhibits the SARS-CoV-2 main protease directly in cell models, host Nrf2 pathway expression is necessary for its antiviral efficacy in vivo.
Limits
The study is entirely preclinical, relying on cell lines and mouse models without human data. Sample sizes, drug dosages, pharmacokinetic properties, and quantitative effect sizes are not reported in the abstract.
Cited by
- supports There are published scientific papers demonstrating direct antiviral effects of sulforaphane.