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Hypoxia-selective macroautophagy and cell survival signaled by autocrine PDGFR activity

Simon Wilkinson1, Jim O'Prey, Michael Fricker

  • 1Tumour Cell Death Laboratory, Beatson Institute for Cancer Research, Glasgow, United Kingdom.

Genes & Development
|June 3, 2009
PubMed

Insights

Platelet-derived growth factor receptor (PDGFR) signaling promotes hypoxia-induced macroautophagy in tumor cells. This process involves HIF1alpha, crucial for tumor cell survival under low oxygen conditions.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Cancer Research

Background:

  • Selective regulation of macroautophagy is not well understood.
  • Macroautophagy plays a role in tumor cell survival.

Purpose of the Study:

  • To investigate the role of PDGFR signaling in hypoxia-induced macroautophagy.
  • To elucidate the mechanism by which PDGFR signaling influences HIF1alpha and macroautophagy.

Main Methods:

  • Investigated PDGFR signaling in tumor cells under hypoxic conditions.
  • Analyzed the impact of PDGFR inhibition on HIF1alpha levels and macroautophagy.
  • Examined HIF1alpha mRNA and protein dynamics.

Main Results:

  • PDGFR signaling selectively promotes hypoxia-induced macroautophagy.
  • HIF1alpha integrates signals from PDGFRs and oxygen tension.
  • PDGFR inhibition reduces HIF1alpha half-life, altering its transcriptome and reducing macroautophagy.

Conclusions:

  • PDGFR signaling is essential for promoting macroautophagy during hypoxia.
  • HIF1alpha-mediated macroautophagy, enhanced by PDGFR signaling, may aid tumor cell survival in hypoxic environments.

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