The Rbm38-p63 feedback loop is critical for tumor suppression and longevity

Yuqian Jiang, Enshun Xu, Jin Zhang, Mingyi Chen, Elsa Flores, Xinbin Chen

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The RNA-binding protein Rbm38 is a target of p63 tumor suppressor and can in-turn repress p63 expression via mRNA stability. Thus, Rbm38 and p63 form a negative feedback loop. To investigate the biological significance of the Rbm38-p63 loop in vivo, a cohort of WT, Rbm38 -/- , TAp63 +/- , and Rbm38 -/- ;TAp63 +/- mice were generated and monitored throughout their lifespan. While mice deficient in Rbm38 or TAp63 alone died mostly from spontaneous tumors, compound Rbm38 -/- ;TAp63 +/- mice had an extended lifespan along with reduced tumor incidence. We also found that loss-of-Rbm38 markedly decreased the percentage of liver steatosis in TAp63 +/- mice. Moreover, we found that Rbm38 deficiency extends the lifespan of tumor-free TAp63 +/- mice along with reduced expression of senescence-associated biomarkers. Consistent with this, Rbm38 -/- ;TAp63 +/- MEFs were resistant, whereas Rbm38 -/- or TAp63 +/- MEFs were prone, to cellular senescence. Importantly, we showed that the levels of inflammatory cytokines (IL17D and Tnfsf15) were significantly reduced by Rbm38 deficiency in senescence-resistant Rbm38 -/- ;TAp63 +/- mouse livers and MEFs. Together, our data suggest that Rbm38 and p63 function as intergenic suppressors in aging and tumorigenesis and that the Rbm38-p63 loop may be explored for enhancing longevity and cancer management.

Original languageEnglish (US)
Pages (from-to)2863-2872
Number of pages10
JournalOncogene
Volume37
Issue number21
DOIs
StatePublished - May 1 2018

ASJC Scopus subject areas

  • Molecular Biology
  • Genetics
  • Cancer Research

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