PMID- 26774139 OWN - NLM STAT- MEDLINE DCOM- 20190128 LR - 20190128 IS - 0028-2685 (Print) IS - 0028-2685 (Linking) VI - 63 IP - 2 DP - 2016 TI - Chidamide and 5-flurouracil show a synergistic antitumor effect on human colon cancer xenografts in nude mice. PG - 193-200 LID - 10.4149/203_150422N214 [doi] AB - Chidamide is a novel histone deacetylase (HDAC) inhibitor that increases the acetylation of histone H3 by inhibiting the activity of HDAC1 and HDAC2. We previously found that treatment of human colon cancer cells with chidamide led to cell apoptosis and cell cycle arrest at G0/1 phase in vitro. The present study extended the observations in vivo and explored the underlying molecular mechanisms. In nude mice bearing human colon cancer LoVo cell xenografts, chidamide alone or in combination with 5-flurouracil (5-Fu) reduced the expression of HDAC1 and HDAC2, accompanied with increased acetylation of histone H3. Chidamide alone inhibited the tumor growth and induce cell apoptosis in tumor-bearing mice. Combined treatment of chidamide with 5-Fu enhanced the anti-tumor activity of 5-Fu. Western blotting analysis showed that chidamide alone or in combination with 5-Fu upregulated the expressions of cleaved Caspase-3 and cleaved poly-ADP (adenosine diphosphate)-ribose polymerase (PARP). In addition, chidamide alone or in combination with 5-Fu increased the p53, phosphorylated-p53 (p-p53), p21 and gammaH2AX levels, but suppressed cyclin dependent kinase 4 (CDK4) expression in tumor cells. Chidamide alone or in combination with 5-Fu down regulated the expressions of p-AKT, p-mammalian target of rapamycin (mTOR), p-p70S6K, p-Raf, and p44/42 mitogen activated protein kinase (Erk1/2), indicating the blockage of these signaling pathways. The results demonstrated that chidamide alone or in combination with 5-Fu exerted anti-tumor activity in nude mice bearing human colon cancer LoVo cell xenografts, and several signaling pathways might be involved in the chidamide-induced tumor growth inhibition and tumor cell apoptosis. FAU - Liu, L AU - Liu L FAU - Qiu, S AU - Qiu S FAU - Liu, Y AU - Liu Y FAU - Liu, Z AU - Liu Z FAU - Zheng, Y AU - Zheng Y FAU - Su, X AU - Su X FAU - Chen, B AU - Chen B FAU - Chen, H AU - Chen H LA - eng PT - Journal Article PL - Slovakia TA - Neoplasma JT - Neoplasma JID - 0377266 RN - 0 (Aminopyridines) RN - 0 (Antimetabolites, Antineoplastic) RN - 0 (Benzamides) RN - 0 (Histone Deacetylase Inhibitors) RN - 0 (Histones) RN - 87CIC980Y0 (N-(2-amino-5-fluorobenzyl)-4-(N-(pyridine-3-acrylyl)aminomethyl)benzamide) RN - EC 2.4.2.30 (Poly (ADP-Ribose) Polymerase-1) RN - EC 3.4.22.- (Caspase 3) RN - EC 3.5.1.98 (Hdac1 protein, mouse) RN - EC 3.5.1.98 (Hdac2 protein, mouse) RN - EC 3.5.1.98 (Histone Deacetylase 1) RN - EC 3.5.1.98 (Histone Deacetylase 2) RN - U3P01618RT (Fluorouracil) SB - IM MH - Aminopyridines/*pharmacology MH - Animals MH - Antimetabolites, Antineoplastic/*pharmacology MH - Antineoplastic Combined Chemotherapy Protocols/*pharmacology MH - Apoptosis/drug effects MH - Benzamides/*pharmacology MH - Caspase 3/metabolism MH - Cell Cycle Checkpoints/drug effects MH - Cell Line, Tumor MH - Cell Proliferation/drug effects MH - Colonic Neoplasms/*drug therapy/*pathology MH - Fluorouracil/*pharmacology MH - Histone Deacetylase 1/antagonists & inhibitors MH - Histone Deacetylase 2/antagonists & inhibitors MH - Histone Deacetylase Inhibitors/*pharmacology MH - Histones/drug effects MH - Humans MH - Mice MH - Mice, Nude MH - Poly (ADP-Ribose) Polymerase-1/metabolism MH - Xenograft Model Antitumor Assays OTO - NOTNLM OT - 5-flurouracil. OT - HDAC inhibitor OT - chidamide OT - colon cancer EDAT- 2016/01/18 06:00 MHDA- 2019/01/29 06:00 CRDT- 2016/01/18 06:00 PHST- 2016/01/18 06:00 [entrez] PHST- 2016/01/18 06:00 [pubmed] PHST- 2019/01/29 06:00 [medline] AID - 10.4149/203_150422N214 [doi] PST - ppublish SO - Neoplasma. 2016;63(2):193-200. doi: 10.4149/203_150422N214.