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Article Dans Une Revue EMBO Reports Année : 2020

MEX3A regulates Lgr5 + stem cell maintenance in the developing intestinal epithelium

Bruno Pereira
  • Fonction : Auteur
Ana Amaral
  • Fonction : Auteur
Alexandre Dias
  • Fonction : Auteur
Nuno Mendes
  • Fonction : Auteur
Vanesa Muncan
  • Fonction : Auteur
Ana Silva
Anca Radu
  • Fonction : Auteur
Leonor David
Valdemar Máximo
  • Fonction : Auteur
Gijs van den Brink
  • Fonction : Auteur
Marc Billaud
Raquel Almeida
  • Fonction : Auteur

Résumé

Intestinal stem cells (ISCs) fuel the lifelong self-renewal of the intestinal tract and are paramount for epithelial repair. In this context, the Wnt pathway component LGR5 is the most consensual ISC marker to date. Still, the effort to better understand ISC identity and regulation remains a challenge. We have generated a Mex3a knockout mouse model and show that this RNA-binding protein is crucial for the maintenance of the Lgr5 + ISC pool, as its absence disrupts epithelial turnover during postnatal development and stereotypical organoid maturation ex vivo. Transcriptomic profiling of intestinal crypts reveals that Mex3a deletion induces the peroxisome proliferator-activated receptor (PPAR) pathway, along with a decrease in Wnt signalling and loss of the Lgr5 + stem cell signature. Furthermore, we identify PPARc activity as a molecular intermediate of MEX3A-mediated regulation. We also show that high PPARc signalling impairs Lgr5 + ISC function, thus uncovering a new layer of post-transcriptional regulation that critically contributes to intestinal homeostasis.
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hal-03089100 , version 1 (05-01-2021)

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Bruno Pereira, Ana Amaral, Alexandre Dias, Nuno Mendes, Vanesa Muncan, et al.. MEX3A regulates Lgr5 + stem cell maintenance in the developing intestinal epithelium. EMBO Reports, 2020, 21 (4), ⟨10.15252/embr.201948938⟩. ⟨hal-03089100⟩

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