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. 2025 Jun;68(6):1646-1661.
doi: 10.1007/s11427-024-2844-8. Epub 2025 Mar 24.

RIG-I-driven CDKN1A stabilization reinforces cellular senescence

Affiliations

RIG-I-driven CDKN1A stabilization reinforces cellular senescence

Cui Wang et al. Sci China Life Sci. 2025 Jun.

Abstract

The innate immune signaling network follows a canonical format for signal transmission. The innate immune pathway is crucial for defense against pathogens, yet its mechanistic crosstalk with aging processes remains largely unexplored. Retinoic acid-inducible gene-I (RIG-I), a key mediator of antiviral immunity within this pathway, has an enigmatic role in stem cell senescence. Our study reveals that RIG-I levels increase in human genetic and physiological cellular aging models, and its accumulation drives cellular senescence. Conversely, CRISPR/Cas9-mediated RIG-I deletion or pharmacological inhibition in human mesenchymal stem cells (hMSCs) confers resistance to senescence. Mechanistically, RIG-I binds to endogenous mRNAs, with CDKN1A mRNA being a prominent target. Specifically, RIG-I stabilizes CDKN1A mRNA, resulting in elevated CDKN1A transcript levels and increased p21Cip1 protein expression, which precipitates senescence. Collectively, our findings establish RIG-I as a post-transcriptional regulator of senescence and suggest potential targets for the mitigation of aging-related diseases.

Keywords: RIG-I; aging; human stem cell; innate immune pathway; senescence.

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Conflict of interest statement

Compliance and ethics. The authors declare that they have no conflict of interest.

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