1. Academic Validation
  2. The PLA2R1-JAK2 pathway upregulates ERRα and its mitochondrial program to exert tumor-suppressive action

The PLA2R1-JAK2 pathway upregulates ERRα and its mitochondrial program to exert tumor-suppressive action

  • Oncogene. 2016 Sep 22;35(38):5033-42. doi: 10.1038/onc.2016.43.
A Griveau 1 2 3 4 G Devailly 1 2 3 4 L Eberst 1 2 3 4 N Navaratnam 5 B Le Calvé 1 2 3 4 M Ferrand 1 2 3 4 P Faull 6 A Augert 1 2 3 4 R Dante 1 2 3 4 J M Vanacker 7 D Vindrieux 1 2 3 4 D Bernard 1 2 3 4
Affiliations

Affiliations

  • 1 Inserm U1052, Centre de Recherche en Cancérologie de Lyon, Lyon, France.
  • 2 CNRS UMR 5286, Lyon, France.
  • 3 Centre Léon Bérard, Lyon, France.
  • 4 Université de Lyon, Lyon, France.
  • 5 Cellular Stress Group, MRC Clinical Sciences Centre, Faculty of Medicine, Imperial College, Hammersmith Campus, London, UK.
  • 6 Biological Mass Spectrometry and Proteomics Laboratory, MRC Clinical Sciences Centre, Imperial College London, London, UK.
  • 7 Institut de Génomique Fonctionnelle de Lyon, Université de Lyon, Université Lyon I, CNRS UMR5242, Ecole Normale Supérieure de Lyon, Lyon, France.
Abstract

Little is known about the biological role of the Phospholipase A2 receptor (PLA2R1) transmembrane protein. In recent years, PLA2R1 has been shown to have an important role in regulating tumor-suppressive responses via JAK2 activation, but the underlying mechanisms are largely undeciphered. In this study, we observed that PLA2R1 increases the mitochondrial content, judged by increased levels of numerous mitochondrial proteins, of the mitochondrial structural component cardiolipin, of the mitochondrial DNA content, and of the mitochondrial DNA replication and transcription factor TFAM. This effect of PLA2R1 relies on a transcriptional program controlled by the estrogen-related receptor alpha1 (ERRα) mitochondrial master regulator. Expression of ERRα and of its nucleus-encoded mitochondrial targets is upregulated upon PLA2R1 ectopic expression, and this effect is mediated by JAK2. Conversely, downregulation of PLA2R1 decreases the level of ERRα and of its nucleus-encoded mitochondrial targets. Finally, blocking the ERRα-controlled mitochondrial program largely inhibits the PLA2R1-induced tumor-suppressive response. Together, our data document ERRα and its mitochondrial program as downstream effectors of the PLA2R1-JAK2 pathway leading to oncosuppression.

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