MilliporeSigma
  • Home
  • Search Results
  • Loss of PTEN stabilizes the lipid modifying enzyme cytosolic phospholipase A₂α via AKT in prostate cancer cells.

Loss of PTEN stabilizes the lipid modifying enzyme cytosolic phospholipase A₂α via AKT in prostate cancer cells.

Oncotarget (2014-07-16)
Soma Vignarajan, Chanlu Xie, Mu Yao, Yuting Sun, Ulla Simanainen, Paul Sved, Tao Liu, Qihan Dong
ABSTRACT

Aberrant increase in pAKT, due to a gain-of-function mutation of PI3K or loss-of-function mutation or deletion of PTEN, occurs in prostate cancer and is associated with poor patient prognosis. Cytosolic phospholipase A₂α (cPLA₂α) is a lipid modifying enzyme by catalyzing the hydrolysis of membrane arachidonic acid. Arachidonic acid and its metabolites contribute to survival and proliferation of prostate cancer cells. We examined whether AKT plays a role in promoting cPLA₂α action in prostate cancer cells. We found a concordant increase in pAKT and cPLA₂α levels in prostate tissue of prostate epithelial-specific PTEN-knockout but not PTEN-wide type mice. Restoration of PTEN expression or inhibition of PI3K action decreased cPLA₂α expression in PTEN-mutated or deleted prostate cancer cells. An increase in AKT by Myr-AKT elevated cPLA₂α protein levels, which could be diminished by inhibition of AKT phosphorylation without noticeable change in total AKT levels. pAKT levels had no influence on cPLA₂α at mRNA levels but reduced cPLA₂α protein degradation. Anti-AKT antibody co-immunoprecipitated cPLA₂α and vice versa. Hence, AKT plays a role in enhancing cPLA₂α protein stability in PTEN-null prostate cancer cells, revealing a link between oncogenic pathway and lipid metabolism.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Z-Leu-Leu-Leu-al, ≥90% (HPLC)
Sigma-Aldrich
Cycloheximide solution, Ready-Made Solution, microbial, 100 mg/mL in DMSO, Suitable for cell culture
Millipore
Cycloheximide solution, 0.1%, suitable for microbiology
Sigma-Aldrich
Monoclonal ANTI-FLAG® M2 antibody produced in mouse, clone M2, purified immunoglobulin (Purified IgG1 subclass), buffered aqueous solution (10 mM sodium phosphate, 150 mM NaCl, pH 7.4, containing 0.02% sodium azide)
Sigma-Aldrich
Cycloheximide, ≥95% (HPLC)
Supelco
Cycloheximide, PESTANAL®, analytical standard
Sigma-Aldrich
Cycloheximide, from microbial, ≥94% (TLC)
Sigma-Aldrich
Cycloheximide, Biotechnology Performance Certified