Differential response of p53 and p21 on HDAC inhibitor-mediated apoptosis in HCT116 colon cancer cells in vitro and in vivo.

Abstract

We investigated the effect of a novel histone deacetylase inhibitor, A-423378.0, on the colon carcinoma cell line HCT116 and genetically modified derivatives lacking either p21(cip1/waf1) or p53. HCT116 cell lines were incubated with A-423378.0 at different concentrations for 3-120 h. Cell viability, proliferation and apoptosis rates were determined and verified by western blot, detection of mitochondrial membrane potential breakdown DeltaPsi(m), activation of caspases-3, -8 and cytokeratin 18 cleavage. A subcutaneous xenograft model was established in NMRI mice with daily intraperitoneal injections of 10 mg/kg for 14 days. All three HCT116 cell lines responded to A-423378.0 treatment in a dose- and time-dependent manner via induction of apoptosis as measured by breakdown of DeltaPsi(m) and BrdU incorporation. We identified that A-423378.0 induced the expression of TRAIL and TRAIL receptor, especially TRAIL-R2/hDR5, which was up-regulated in HCT116 cells after treatment with A-423378.0. In vivo, a growth inhibitory effect was observed with HDAC-I treatment, which was paralleled by a down-regulation of PCNA and a concomitant induction of apoptosis. Treatment of wild-type or knock-out HCT116 cells with A-423378.0 exerts potent anti-proliferative and pro-apoptotic effects in vitro and in vivo. A-423378.0 was able to induce apoptosis in both p21(WAF1) and p53 deficient tumour cells, which appeared to be mediated by the intrinsic cell death pathway. Interestingly, the effects of A-423378.0 on the extrinsic cell death pathway through activation of TRAIL and its signalling pathway indicate that A-423378.0 may be a potent new therapeutic compound for the treatment of advanced colorectal cancer.

• Authors: Steffen Zopf, Daniel Neureiter, Steve Bouralexis, Tobias Abt, Keith B Glaser, Kinya Okamoto, Marion Ganslmayer, Eckhart G Hahn, Christoph Herold, Matthias Ocker
• Journal: International journal of oncology (Int J Oncol) Vol. 31 Issue 6 Pg. 1391-402 (Dec 2007) ISSN: 1019-6439 [Print] Greece
• PMID: 17982666 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• A-423378.0
• CDKN1A protein, human
• Cyclin-Dependent Kinase Inhibitor p21
• Enzyme Inhibitors
• Histone Deacetylase Inhibitors
• RNA, Messenger
• Receptors, TNF-Related Apoptosis-Inducing Ligand
• TNF-Related Apoptosis-Inducing Ligand
• TNFSF10 protein, human
• Thiazoles
• Tumor Suppressor Protein p53
• bcl-2-Associated X Protein
• Caspases

Topics

• Animals
• Apoptosis (drug effects)
• Caspases (metabolism)
• Cell Proliferation (drug effects)
• Colonic Neoplasms (drug therapy, pathology)
• Cyclin-Dependent Kinase Inhibitor p21 (physiology)
• Enzyme Inhibitors (pharmacology)
• HCT116 Cells
• Histone Deacetylase Inhibitors
• Humans
• Male
• Membrane Potentials (drug effects)
• Mice
• RNA, Messenger (analysis)
• Receptors, TNF-Related Apoptosis-Inducing Ligand (analysis, genetics)
• TNF-Related Apoptosis-Inducing Ligand (analysis)
• Thiazoles (pharmacology)
• Tumor Suppressor Protein p53 (physiology)
• bcl-2-Associated X Protein (physiology)