title: A polysaccharide from Pinellia ternata inhibits cell proliferation and metastasis in human cholangiocarcinoma cells by targeting of Cdc42 and 67kDa Laminin Receptor (LR).
abstract: In this study, we isolated and purified a polysaccharide (PTPA) from the tubers of Pinellia ternate. We aimed to evaluate the cytotoxic effects of PTPA on human cholangiocarcinoma (CCA) cell lines and to identify the underlying molecular mechanism. PTPA at the dose from 25 to 200μg/mL showed significant inhibitory effect on the proliferation of four cancer cell lines (SNU-245, CL-6, Sk-ChA-1 and MZ-ChA-1), among which Sk-ChA-1 was a most sensitive cell line to PTPA treatment via induction of apoptosis. Interestingly, RNA interference of Sk-ChA-1 cells with 67LR or Cdc42-targeted shRNAs resulted a similar potency in decreasing cell viability and causing apoptotic death. Moreover, PTPA (100μg/mL) or 67LR or Cdc42 special shRNAs increased the ratio of pro-apoptotic Bax to anti-apoptotic Bcl-2, induced the activation of caspase-9 and caspase-3, but not caspsase-8, and inhibited the expression of 67LR or Cdc42 protein in Sk-ChA-1 cells. Taken together, the inhibitory effect of PTPA on the cell growth of Sk-ChA-1 cells was at least in part mediated via the activation of the intrinsic mitochondrial apoptotic pathway and the downregulation of 67LR or Cdc42 protein expression. Thus, PTPA may be developed as a promising candidate for chemopreventive agent in the prevention and treatment of human CCA.
authors: Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, China.
authors: Yong
authors: Y
authors: Li
authors: Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, China.
authors: Dajiang
authors: D
authors: Li
authors: Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, China.
authors: Jian
authors: J
authors: Chen
authors: Institute of Hepatobiliary Surgery, Southwest Hospital, Third Military Medical University, Chongqing, China. Electronic address: shguangwang@tom.com.
authors: Shuguang
authors: S
authors: Wang
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000494:pharmacology*; D045744:Cell Line, Tumor; D000067470:Cellular Reprogramming Techniques; D018281:Cholangiocarcinoma / Q000188:drug therapy* / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D009363:Neoplasm Proteins / Q000037:antagonists & inhibitors* / Q000378:metabolism; D030021:Pinellia / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry / Q000494:pharmacology*; D017474:Receptors, Laminin / Q000037:antagonists & inhibitors / Q000378:metabolism; D012269:Ribosomal Proteins; D020764:cdc42 GTP-Binding Protein / Q000037:antagonists & inhibitors* / Q000378:metabolism
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D009363:Neoplasm Proteins; D011134:Polysaccharides; C510624:RPSA protein, human; D017474:Receptors, Laminin; D012269:Ribosomal Proteins; D020764:cdc42 GTP-Binding Protein
keywords: Cholangiocarcinoma; Pinellia ternate; Polysaccharide