Histone deacetylase inhibitors differentially stabilize acetylated p53 and induce cell cycle arrest or apoptosis in prostate cancer cells.

In LNCaP prostate cancer cells CG-1521, a new inhibitor of histone deacetylases, alters the acetylation of p53 in a site-specific manner. While p53 is constitutively acetylated at Lys320 in LNCaP cells, treatment with CG-1521, stabilizes the acetylation of p53 at Lys373, elevating p21 (and inducing cell cycle arrest). Treatment with CG-1521 also promotes Bax translocation to the mitochondria and cleavage, and apoptosis. TSA stabilizes the acetylation of p53 at Lys382, elevating p21 levels and inducing cell cycle arrest, but does not induce Bax translocation or apoptosis. In LNCaP cells CG-1521, but not TSA, promotes the rapid degradation of HDAC2. These data suggest that the acetylation of p53 at Lys373 is required for the p53-mediated induction of cell cycle arrest and apoptosis, while acetylation of p53 at Lys382 induces only cell cycle arrest. In p53(-/-) PC3 cells both compounds induce p21 and cell cycle arrest, but not Bax translocation or apoptosis, suggesting that both compounds can also induce p21 through a p53-independent mechanism.
AuthorsS Roy, K Packman, R Jeffrey, M Tenniswood
JournalCell death and differentiation (Cell Death Differ) Vol. 12 Issue 5 Pg. 482-91 (May 2005) ISSN: 1350-9047 [Print] England
PMID15746940 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • BAX protein, human
  • Enzyme Inhibitors
  • Histone Deacetylase Inhibitors
  • Proto-Oncogene Proteins c-bcl-2
  • Tumor Suppressor Protein p53
  • bcl-2-Associated X Protein
  • Acetylation
  • Apoptosis (drug effects)
  • Cell Cycle (drug effects)
  • Cell Line, Tumor
  • Enzyme Inhibitors (pharmacology)
  • G2 Phase (drug effects)
  • Gene Expression Regulation, Neoplastic (drug effects)
  • Histone Deacetylase Inhibitors
  • Humans
  • Male
  • Prostatic Neoplasms (drug therapy, enzymology, metabolism, pathology)
  • Proto-Oncogene Proteins c-bcl-2 (metabolism)
  • Tumor Suppressor Protein p53 (genetics, metabolism)
  • bcl-2-Associated X Protein

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