Accumulation of senescent cells is an important contributor to chronic inflammation upon aging. The inflammatory phenotype of senescent cells was previously shown to be driven by cytoplasmic DNA. Here, we propose that cytoplasmic double-stranded RNA has a similar effect. We find that several cell types driven into senescence by different routes share an accumulation of long promoter RNAs and 3' gene extensions rich in retrotransposon sequences. Accordingly, these cells display increased expression of genes involved in response to double stranded RNA of viral origin downstream of the interferon pathway. The RNA accumulation is associated with evidence of reduced RNA turnover, including in some cases, reduced expression of RNA exosome subunits. Reciprocally, depletion of RNA exosome subunit EXOSC3 accelerated expression of multiple senescence markers. A senescence-like RNA accumulation was also observed in cells exposed to oxidative stress, an important trigger of cellular senescence. Altogether, we propose that in a subset of senescent cells, repeat-containing transcripts stabilized by oxidative stress or reduced RNA exosome activity participate in driving and maintaining the permanent inflammatory state characterizing cellular senescence.

Reduced RNA turnover as a driver of cellular senescence / Mullani, Nowsheen; Porozhan, Yevheniia; Mangelinck, Adèle; Rachez, Christophe; Costallat, Mickael; Batsché, Eric; Goodhardt, Michele; Cenci, Giovanni; Mann, Carl; Muchardt, Christian. - In: LIFE SCIENCE ALLIANCE. - ISSN 2575-1077. - 4:3(2021), pp. 1-16. [10.26508/lsa.202000809]

Reduced RNA turnover as a driver of cellular senescence

Cenci, Giovanni
Writing – Review & Editing
;
2021

Abstract

Accumulation of senescent cells is an important contributor to chronic inflammation upon aging. The inflammatory phenotype of senescent cells was previously shown to be driven by cytoplasmic DNA. Here, we propose that cytoplasmic double-stranded RNA has a similar effect. We find that several cell types driven into senescence by different routes share an accumulation of long promoter RNAs and 3' gene extensions rich in retrotransposon sequences. Accordingly, these cells display increased expression of genes involved in response to double stranded RNA of viral origin downstream of the interferon pathway. The RNA accumulation is associated with evidence of reduced RNA turnover, including in some cases, reduced expression of RNA exosome subunits. Reciprocally, depletion of RNA exosome subunit EXOSC3 accelerated expression of multiple senescence markers. A senescence-like RNA accumulation was also observed in cells exposed to oxidative stress, an important trigger of cellular senescence. Altogether, we propose that in a subset of senescent cells, repeat-containing transcripts stabilized by oxidative stress or reduced RNA exosome activity participate in driving and maintaining the permanent inflammatory state characterizing cellular senescence.
2021
RNA turnover; senescence; aging
01 Pubblicazione su rivista::01a Articolo in rivista
Reduced RNA turnover as a driver of cellular senescence / Mullani, Nowsheen; Porozhan, Yevheniia; Mangelinck, Adèle; Rachez, Christophe; Costallat, Mickael; Batsché, Eric; Goodhardt, Michele; Cenci, Giovanni; Mann, Carl; Muchardt, Christian. - In: LIFE SCIENCE ALLIANCE. - ISSN 2575-1077. - 4:3(2021), pp. 1-16. [10.26508/lsa.202000809]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1476897
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