VHL loss in renal cell carcinoma leads to up-regulation of CUB domain-containing protein 1 to stimulate PKC{delta}-driven migration

Proc Natl Acad Sci U S A. 2011 Feb 1;108(5):1931-6. doi: 10.1073/pnas.1011777108. Epub 2011 Jan 13.

Abstract

A common genetic mutation found in clear cell renal cell carcinoma (CC-RCC) is the loss of the von Hippel-Lindau (VHL) gene, which results in stabilization of hypoxia-inducible factors (HIFs), and contributes to cancer progression and metastasis. CUB-domain-containing protein 1 (CDCP1) was shown to promote metastasis in scirrhous and lung adenocarcinomas as well as in prostate cancer. In this study, we established a molecular mechanism linking VHL loss to induction of the CDCP1 gene through the HIF-1/2 pathway in renal cancer. Also, we report that Fyn, which forms a complex with CDCP1 and mediates its signaling to PKCδ, is a HIF-1 target gene. Mechanistically, we found that CDCP1 specifically regulates phosphorylation of PKCδ, but not of focal adhesion kinase or Crk-associated substrate. Signal transduction from CDCP1 to PKCδ leads to its activation, increasing migration of CC-RCC. Furthermore, patient survival can be stratified by CDCP1 expression at the cell surface of the tumor. Taken together, our data indicates that CDCP1 protein might serve as a therapeutic target for CC-RCC.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigens, CD / genetics
  • Antigens, CD / physiology*
  • Antigens, Neoplasm
  • Carcinoma, Renal Cell / genetics*
  • Cell Adhesion Molecules / genetics
  • Cell Adhesion Molecules / physiology*
  • Humans
  • Kidney Neoplasms / genetics*
  • Mutation
  • Neoplasm Proteins / genetics
  • Neoplasm Proteins / physiology*
  • Phosphorylation
  • Protein Kinase C-delta / metabolism*
  • Signal Transduction
  • Up-Regulation*
  • Von Hippel-Lindau Tumor Suppressor Protein / genetics
  • Von Hippel-Lindau Tumor Suppressor Protein / physiology*

Substances

  • Antigens, CD
  • Antigens, Neoplasm
  • CDCP1 protein, human
  • Cell Adhesion Molecules
  • Neoplasm Proteins
  • Von Hippel-Lindau Tumor Suppressor Protein
  • Protein Kinase C-delta
  • VHL protein, human