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Systemic Par-4 inhibits non-autochthonous tumor growth

Yanming Zhao1, Ravshan Burikhanov, Jason Brandon

  • 1Department of Radiation Medicine, University of Kentucky, Lexington, KY USA.

Cancer Biology & Therapy
|May 27, 2011
PubMed

Insights

Extracellular Prostate apoptosis response-4 (Par-4) protein, particularly its SAC domain, demonstrates systemic anti-tumor effects. This secreted protein inhibits tumor growth and metastasis, suggesting therapeutic potential.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Immunology

Background:

  • Prostate apoptosis response-4 (Par-4) is a tumor suppressor protein secreted by cells.
  • Extracellular Par-4, via its SAC domain, induces apoptosis in cancer cells by targeting the GRP78 receptor.
  • The in vivo functionality of extracellular Par-4/SAC has not been previously established.

Purpose of the Study:

  • To validate the functional significance of extracellular Par-4/SAC in animal models.
  • To investigate the systemic anti-tumor effects of Par-4/SAC.
  • To explore the therapeutic potential of extracellular Par-4/SAC.

Main Methods:

  • Generation of Par-4/SAC-transgenic mice expressing systemic Par-4/SAC.
  • Assessment of tumor growth resistance in transgenic mice.
  • Bone marrow transplantation experiments to transfer secretory Par-4/SAC pro-apoptotic activity.
  • Intravenous injection of recombinant Par-4 or SAC protein to evaluate metastasis inhibition.

Main Results:

  • Par-4/SAC-transgenic mice exhibited resistance to non-autochthonous tumor growth.
  • Pro-apoptotic activity of secretory Par-4/SAC was transferable via bone marrow transplantation.
  • Recombinant Par-4 or SAC protein administration inhibited cancer cell metastasis.

Conclusions:

  • Extracellular Par-4/SAC is functionally active systemically in inhibiting tumor growth.
  • Extracellular Par-4/SAC plays a role in preventing metastasis progression.
  • Extracellular Par-4/SAC warrants further investigation as a potential cancer therapy.

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