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Mitochondrial PAK6 inhibits prostate cancer cell apoptosis via the PAK6-SIRT4-ANT2 complex

Tingting Li1, Yang Li1, Tong Liu2

  • 1Department of Cell Biology, Key Laboratory of Cell Biology, National Health Commission of the PRC, and Key Laboratory of Medical Cell Biology, Ministry of Education of the PRC, Shenyang 110122, Liaoning, China.

Theranostics
|March 21, 2020
PubMed

Insights

P21-activated kinase 6 (PAK6) regulates mitochondrial apoptosis in prostate cancer by affecting the stability and modification of ANT2 via the SIRT4 pathway. This PAK6-SIRT4-ANT2 complex offers potential as a biomarker for prostate cancer treatment and prognosis.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • P21-activated kinase 6 (PAK6) is a serine/threonine kinase implicated in various malignancies, particularly prostate cancer.
  • The specific role of PAK6 within mitochondria and its impact on apoptosis in prostate cancer cells remained largely uncharacterized.

Purpose of the Study:

  • To elucidate the function of PAK6 in prostate cancer cell mitochondria.
  • To investigate the molecular mechanisms by which PAK6 influences apoptosis and tumor growth.
  • To identify potential biomarkers for prostate cancer diagnosis and treatment.

Main Methods:

  • Immunohistochemistry to assess PAK6, SIRT4, and ANT2 expression in prostate cancer tissues.
  • Immunofluorescence and immunoelectron microscopy for subcellular localization of PAK6.
  • Ubiquitination, immunoprecipitation, and Western blot assays to determine protein interactions and modifications.
  • Flow cytometry and xenograft models to evaluate apoptosis and cell cycle regulation.

Main Results:

  • PAK6 localizes to the mitochondrial inner membrane and promotes SIRT4 degradation.
  • SIRT4-mediated deacetylation of ANT2 at K105 leads to its ubiquitination and degradation.
  • PAK6 directly phosphorylates ANT2 at T107, inhibiting apoptosis and promoting tumor growth.
  • PAK6 expression positively correlates with ANT2 and negatively with SIRT4 in clinical prostate cancer samples.

Conclusions:

  • The PAK6-SIRT4-ANT2 complex plays a critical role in regulating mitochondrial apoptosis in prostate cancer.
  • PAK6 modulates ANT2 stability and function through phosphorylation and by influencing its deacetylation via SIRT4.
  • This complex represents a promising biomarker for prostate cancer prognosis and therapeutic targeting.
Keywords:
ANT2PAK6SIRT4apoptosisprostate cancer.

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