title: Chemopreventive effect of protein extract of Asterina pectinifera in HT-29 human colon adenocarcinoma cells.
abstract: We investigated the effect of protein extract of Asterina pectinifera on the activity of 4 enzymes that may play a role in adenocarcinoma of the colon: quinone reductase (QR), glutathione S-transferase (GST), ornithine decarboxylase (ODC), and cyclooxygenase (COX)-2. QR and GST activity increased in HT-29 human colon adenocarcinoma cells increased that had been exposed to 4 concentrations of the protein extract (80, 160, 200, and 240 microg/mL). Additionally, 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced ODC activity decreased significantly in cells exposed to the extract in concentrations of 160 microg/mL (p<0.05), 200 microg/mL (p<0.005), and 240 microg/mL (p<0.005). TPA-induced COX-2 activity also decreased in cells exposed to extract concentrations of 10, 20, 40, and 60 microg/mL. COX-2 expression was also inhibited in cells exposed to this extract. These results suggest that this protein extract of A pectinifera has chemopreventive activity in HT-29 human colon adenocarcinoma cells, and therefore, may have the potential to function as a chemopreventive agent in human colorectal cancer.
authors.affiliation: Department of Pharmacology, College of Medicine and Intractable Disease Research Center, Dongguk University, Gyeongju, Korea.
authors.forename: Yun-Hee
authors.initials: YH
authors.lastname: Shon
authors.forename: Kyung-Soo
authors.initials: KS
authors.lastname: Nam
mesh_terms: D000230:Adenocarcinoma; D000970:Antineoplastic Agents / Q000302:isolation & purification / Q000494:pharmacology*; D047288:Asterina / Q000737:chemistry; D003110:Colonic Neoplasms; D051546:Cyclooxygenase 2 / Q000378:metabolism; D052246:Cyclooxygenase 2 Inhibitors / Q000302:isolation & purification / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D005982:Glutathione Transferase / Q000378:metabolism; D019073:HT29 Cells / Q000187:drug effects* / Q000201:enzymology; D006801:Humans; D016660:NAD(P)H Dehydrogenase (Quinone) / Q000378:metabolism; D009955:Ornithine Decarboxylase / Q000378:metabolism; D065108:Ornithine Decarboxylase Inhibitors; D011506:Proteins / Q000302:isolation & purification / Q000494:pharmacology*; D013755:Tetradecanoylphorbol Acetate
chemical_list: D000970:Antineoplastic Agents; D052246:Cyclooxygenase 2 Inhibitors; D065108:Ornithine Decarboxylase Inhibitors; D011506:Proteins; D051546:Cyclooxygenase 2; D016660:NAD(P)H Dehydrogenase (Quinone); D005982:Glutathione Transferase; D009955:Ornithine Decarboxylase; D013755:Tetradecanoylphorbol Acetate