p53 Is a Master Regulator of Proteostasis in SMARCB1-Deficient Malignant Rhabdoid Tumors

Academic Article

Abstract

  • © 2019 Elsevier Inc. Alterations in chromatin remodeling genes have been increasingly implicated in human oncogenesis. Specifically, the biallelic inactivation of the SWI/SNF subunit SMARCB1 results in the emergence of extremely aggressive pediatric malignancies. Here, we developed embryonic mosaic mouse models of malignant rhabdoid tumors (MRTs) that faithfully recapitulate the clinical-pathological features of the human disease. We demonstrated that SMARCB1-deficient malignancies exhibit dramatic activation of the unfolded protein response (UPR) and ER stress response via a genetically intact MYC-p19 ARF -p53 axis. As a consequence, these tumors display an exquisite sensitivity to agents inducing proteotoxic stress and inhibition of the autophagic machinery. In conclusion, our findings provide a rationale for drug repositioning trials investigating combinations of agents targeting the UPR and autophagy in SMARCB1-deficient MRTs.
  • Digital Object Identifier (doi)

    Author List

  • Carugo A; Minelli R; Sapio L; Soeung M; Carbone F; Robinson FS; Tepper J; Chen Z; Lovisa S; Svelto M
  • Start Page

  • 204
  • End Page

  • 220.e9
  • Volume

  • 35
  • Issue

  • 2