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Laser-capture Microdissection of Human Prostatic Epithelium for RNA Analysis
07:42

Laser-capture Microdissection of Human Prostatic Epithelium for RNA Analysis

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Characterization of a novel negative regulator (DOC-2/DAB2) of c-Src in normal prostatic epithelium and cancer

Jian Zhou1, Jessica Scholes, Jer-Tsong Hsieh

  • 1Department of Urology, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9110, USA.

The Journal of Biological Chemistry
|December 11, 2002
PubMed

Insights

DOC-2/DAB2, a tumor suppressor, inhibits prostate cancer growth by interacting with c-Src. This interaction inactivates c-Src, providing a new mechanism for controlling prostatic cancer.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • DOC-2/DAB2 acts as a tumor suppressor in various cancers, including prostate cancer.
  • DOC-2/DAB2 inhibits prostate cancer growth by modulating protein kinase C and growth factor signaling pathways via the Ras-MAPK pathway.

Purpose of the Study:

  • To investigate the interaction between DOC-2/DAB2 and Src homology 3 (SH3) domain-containing proteins.
  • To elucidate the mechanism by which DOC-2/DAB2 modulates c-Src activity in prostate cancer cells.

Main Methods:

  • Co-immunoprecipitation assays to study protein-protein interactions.
  • Western blotting to assess protein phosphorylation and activation levels.
  • Analysis of c-Src activity through phosphorylation at tyrosine 416 and downstream effector activation.

Main Results:

  • The proline-rich domain of DOC-2/DAB2 interacts with SH3 domain-containing proteins, including c-Src and Fgr.
  • Growth factor stimulation enhances the binding of c-Src to DOC-2/DAB2.
  • This interaction leads to the inactivation of c-Src, evidenced by decreased phosphorylation at Tyr416 and reduced downstream signaling.

Conclusions:

  • DOC-2/DAB2 binds to the SH3 domain of c-Src, maintaining it in an inactive conformation.
  • This study reveals a novel mechanism for regulating c-Src activity in the prostatic epithelium and prostate cancer.

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