Synergistic signaling of tumor cell invasiveness by hepatocyte growth factor and hypoxia

J Biol Chem. 2014 Jul 25;289(30):20448-61. doi: 10.1074/jbc.M114.580597.

Abstract

Hepatocyte growth factor (HGF) signaling promotes tumor invasiveness in renal cell carcinoma (RCC) and other cancers. In clear cell RCC, VHL loss generates pseudohypoxia that exacerbates HGF-driven invasion through β-catenin deregulation. Hypoxia also enhances HGF-driven invasiveness by papillary RCC cells, but in the absence of VHL, loss signaling integration involves three parallel routes: 1) hypoxia-induced reactive oxygen species production and decreased DUSP2 expression, leading to enhanced mitogen-activated protein kinase (MAPK) cascade activation; 2) reactive oxygen species-induced diacylglycerol production by phospholipase Cγ, leading to protein kinase C activation and increased protein phosphatase- 2A activity, thereby suppressing HGF-induced Akt activation; and 3) a profound shift from HGF-enhanced, proliferation- oriented metabolism to autophagy-dependent invasion and suppression of proliferation. This tripartite signaling integration was not unique to RCC or HGF; in RCC cells, invasive synergy induced by the combination of hypoxia and epidermal growth factor occurred through the same mechanism, and in estrogen receptor-positive breast cancer cells, this mechanism was suppressed in the absence of estrogen. These results define the molecular basis of growth factor and hypoxia invasive synergy in VHL-competent papillary RCC cells, illustrate the plasticity of invasive and proliferative tumor cell states, and provide signaling profiles by which they may be predicted.

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Breast Neoplasms / genetics
  • Breast Neoplasms / metabolism*
  • Breast Neoplasms / pathology
  • Carcinoma, Renal Cell / genetics
  • Carcinoma, Renal Cell / metabolism*
  • Carcinoma, Renal Cell / pathology
  • Cell Hypoxia / genetics
  • Cell Line, Tumor
  • Dual Specificity Phosphatase 2 / genetics
  • Dual Specificity Phosphatase 2 / metabolism
  • Female
  • Gene Expression Regulation, Enzymologic / genetics
  • Gene Expression Regulation, Neoplastic / genetics
  • Hepatocyte Growth Factor / genetics
  • Hepatocyte Growth Factor / metabolism*
  • Humans
  • Kidney Neoplasms / genetics
  • Kidney Neoplasms / metabolism*
  • Kidney Neoplasms / pathology
  • MAP Kinase Signaling System*
  • Neoplasm Invasiveness
  • Protein Kinase C / genetics
  • Protein Kinase C / metabolism
  • Protein Phosphatase 2 / genetics
  • Protein Phosphatase 2 / metabolism
  • Proto-Oncogene Proteins c-akt / genetics
  • Proto-Oncogene Proteins c-akt / metabolism
  • Reactive Oxygen Species / metabolism
  • Von Hippel-Lindau Tumor Suppressor Protein / genetics
  • Von Hippel-Lindau Tumor Suppressor Protein / metabolism

Substances

  • HGF protein, human
  • Reactive Oxygen Species
  • Hepatocyte Growth Factor
  • Von Hippel-Lindau Tumor Suppressor Protein
  • Proto-Oncogene Proteins c-akt
  • Protein Kinase C
  • Protein Phosphatase 2
  • DUSP2 protein, human
  • Dual Specificity Phosphatase 2
  • VHL protein, human