Inhibition of Stat3 activity by YC-1 enhances chemo-sensitivity in hepatocellular carcinoma.
The present study investigated the effect of YC-1, a novel anti-cancer agent, on the chemo-sensitivity of hepatocellular carcinoma (HCC). YC-1 was administered with chemo-cytotoxic drug, cisplatin, both in vitro and in vivo. YC-1 alone downregulated the expression of phosphorylated form of signal transducers and activators of transcription 3 (P-Stat3[705]), a key mediator in chemo-resistance. When combined with cisplatin, YC-1 further promoted tumor cell apoptosis, decreased the expression of P-Stat3(705), Bcl-xL, CyclinD1 and survivin, and induced the cleavage of caspase 9 and PARP. Overexpression of Stat3 reversed YC-1 induced cell death. YC-1 inhibited Stat3 activity by enhancing the polyubiquitination of P-Stat3(705) induced by cisplatin. In the in vivo setting, YC-1 combined with cisplatin remarkably suppressed tumor growth in a HCC xenograft model, and this effect was also accompanied by YC-1 mediated downregulation of P-Stat3(705), Bcl-xL, Cyclin D1 and survivin, and induction of cleaved caspase 9 and PARP in the tumor tissues. In conclusion, the present study demonstrated a novel anti-cancer effect of YC-1 in enhancing chemo-sensitivity of HCC cells to cisplatin through a Stat3 dependent manner. This finding provides insight into design of a new therapeutic strategy to improve efficacy of chemotherapy in HCC patients.
Center for Cancer Research and Department of Surgery, The University of Hong Kong, Pokfulam, Hong Kong, China.
Chi Keung
CK
Lau
Zhen Fan
ZF
Yang
Shuk Pik
SP
Lam
Chi Tat
CT
Lam
Patricia
P
Ngai
Ka Ho
KH
Tam
Ronnie Tung-Ping
RT
Poon
Sheung Tat
ST
Fan
D000818:Animals; D000970:Antineoplastic Agents / Q000494:pharmacology* / Q000627:therapeutic use; D017209:Apoptosis / Q000187:drug effects; D006528:Carcinoma, Hepatocellular / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D053453:Caspase 9 / Q000096:biosynthesis / Q000235:genetics; D045744:Cell Line, Tumor / Q000187:drug effects / Q000378:metabolism; D002945:Cisplatin / Q000494:pharmacology*; D056741:Cyclin D; D016213:Cyclins / Q000096:biosynthesis / Q000235:genetics; D019008:Drug Resistance, Neoplasm / Q000187:drug effects; D004357:Drug Synergism; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D007191:Indazoles / Q000494:pharmacology* / Q000627:therapeutic use; D051034:Inhibitor of Apoptosis Proteins; D008113:Liver Neoplasms / Q000188:drug therapy* / Q000378:metabolism / Q000473:pathology; D008114:Liver Neoplasms, Experimental / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008869:Microtubule-Associated Proteins / Q000096:biosynthesis / Q000235:genetics; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors* / Q000096:biosynthesis / Q000235:genetics; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases / Q000096:biosynthesis / Q000235:genetics; D011499:Protein Processing, Post-Translational / Q000187:drug effects; D050796:STAT3 Transcription Factor / Q000037:antagonists & inhibitors* / Q000378:metabolism; D000077022:Survivin; D054875:Ubiquitination / Q000187:drug effects; D023041:Xenograft Model Antitumor Assays; D051020:bcl-X Protein / Q000096:biosynthesis / Q000235:genetics
D000970:Antineoplastic Agents; C494811:BCL2L1 protein, human; C107489:BIRC5 protein, human; D056741:Cyclin D; D016213:Cyclins; D007191:Indazoles; D051034:Inhibitor of Apoptosis Proteins; D008869:Microtubule-Associated Proteins; D009363:Neoplasm Proteins; D050796:STAT3 Transcription Factor; C494086:STAT3 protein, human; D000077022:Survivin; D051020:bcl-X Protein; C090937:3-(5'-hydroxymethyl-2'-furyl)-1-benzylindazole; C499320:PARP1 protein, human; D000071137:Poly (ADP-Ribose) Polymerase-1; D011065:Poly(ADP-ribose) Polymerases; C506433:CASP9 protein, human; D053453:Caspase 9; D002945:Cisplatin