Related Experiment Video

Updated: May 26, 2026

RhoC GTPase Activation Assay
09:58

RhoC GTPase Activation Assay

Published on: August 22, 2010

The interaction of PKN3 with RhoC promotes malignant growth

Keziban Unsal-Kacmaz1, Shoba Ragunathan, Edward Rosfjord

  • 1Oncology Research Unit, Pfizer Oncology, Pfizer Worldwide Research and Development, Pearl River, NY 10965, USA. Keziban.Unsal-Kacmaz@Pfizer.com

Molecular Oncology
|January 6, 2012
PubMed

Insights

Protein kinase N3 (PKN3) drives prostate and breast cancer growth and metastasis by interacting with RhoC. Targeting this PKN3-RhoC complex may offer a new therapeutic strategy for advanced cancers.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Protein kinase N3 (PKN3) is an AGC-family kinase linked to metastatic prostate cancer growth, but its precise role in tumorigenesis is unclear.
  • Understanding PKN3's molecular mechanisms is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying PKN3's contribution to malignant growth and metastasis.
  • To investigate the interaction between PKN3 and Rho-family GTPases in cancer.

Main Methods:

  • Utilized orthotopic mouse models for inducible knockdown of PKN3.
  • Performed in-vitro studies involving overexpression of PKN3 in breast cancer cells.
  • Analyzed protein-protein interactions between PKN3 and Rho GTPases, specifically RhoC.

Main Results:

  • Inducible knockdown of PKN3 inhibited primary tumor growth and blocked metastasis in mouse models.
  • Overexpression of PKN3 enhanced malignant behavior and invasiveness of breast cancer cells in-vitro.
  • PKN3 physically interacts with RhoC, a known mediator of tumor invasion and metastasis, with increased catalytic activity in the presence of Rho GTPases.

Conclusions:

  • PKN3 promotes prostate and breast cancer progression and metastasis through its interaction with RhoC.
  • The limited expression of PKN3 and RhoC in normal tissues but upregulation in late-stage malignancies makes them promising therapeutic targets.
  • The PKN3-RhoC complex represents a novel and attractive therapeutic target for late-stage malignancies.

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