RasGAP promotes autophagy and thereby suppresses platelet-derived growth factor receptor-mediated signaling events, cellular responses, and pathology

Hetian Lei, Cynthia X. Qian, Jinghu Lei, Luis Haddock, Shizuo Mukai, Andrius Kazlauskas

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Platelet-derived growth factors (PDGFs) and their receptors (PDGFRs) make profound contributions to both physiology and pathology. While it is widely believed that direct (PDGF-mediated) activation is the primary mode of activating PDGFRs, the discovery that they can also be activated indirectly begs the question of the relevance of the indirect mode of activating PDGFRs. In the context of a blinding eye disease, indirect activation of PDGFRα results in persistent signaling, which suppresses the level of p53 and thereby promotes viability of cells that drive pathogenesis. Under the same conditions, PDGFRβ fails to undergo indirect activation. In this paper, we report that RasGAP (GTPase-activating protein of Ras) prevented indirect activation of PDGFRβ. RasGAP, which associates with PDGFRβ but not PDGFRα, reduced the level of mitochondrion-derived reactive oxygen species, which are required for enduring activation of PDGFRs. Furthermore, preventing PDGFRβ from associating with RasGAP allowed it to signal enduringly and drive pathogenesis of a blinding eye disease. These results indicate a previously unappreciated role of RasGAP in antagonizing indirect activation of PDGFRβ, define the underlying mechanism, and raise the possibility that PDGFRβ-mediated diseases involve indirect activation of PDGFRβ.

Original languageEnglish (US)
Pages (from-to)1673-1685
Number of pages13
JournalMolecular and Cellular Biology
Volume35
Issue number10
DOIs
StatePublished - 2015
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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