title: Effects of bile acids on proliferation and production of proteinase activity of Uronema marinum (Ciliophora: Scuticociliatida).
abstract: Little is known about the effects of bile acids in relation to infectivity on the biological characteristics of Uronema marinum, a serious opportunistic parasite of farmed olive flounder Paralichthys olivaceus. In this study, we examined the effects of bile acids on the proliferation of U. marinum and on proteinase production in vitro. Proliferation of U, marinum was significantly enhanced by lithocholic acid (LCA) at 30 and 60 pmol, and by chenodeoxycholic acid (CDCA) at 0.06 pmol. In contrast, a significant decrease in proliferation was observed with cholic acid (CA) at 30 and 60 micromol, and with deoxycholic acid (DCA) at all amounts used. Proteinase production from live U. marinum was significantly increased by LCA, whereas CA significantly decreased proteinase production. CDCA and DCA had no effect on proteinase production. Although the types and concentrations of bile acids in the faeces of olive flounder are not known, the present results suggest that bile acids in the culturing water might influence the proliferation and production of proteinases in U. marinum, resulting in an increased possibility of scuticociliatosis in olive flounder farms.
authors.affiliation: Department of Aquatic Life Medicine, Pukyong National University, Pusan 608-737, South Korea.
authors.forename: Hyoung Jun
authors.initials: HJ
authors.lastname: Kim
authors.forename: Su Kyung
authors.initials: SK
authors.lastname: Choi
authors.forename: Seung Hyuk
authors.initials: SH
authors.lastname: Choi
authors.forename: Min Sun
authors.initials: MS
authors.lastname: Kim
authors.forename: Sung Koo
authors.initials: SK
authors.lastname: Kim
authors.forename: Yoon Kwon
authors.initials: YK
authors.lastname: Nam
authors.forename: Ki Hong
authors.initials: KH
authors.lastname: Kim
mesh_terms: D000818:Animals; D017756:Aquaculture; D001647:Bile Acids and Salts / Q000633:toxicity*; D002635:Chenodeoxycholic Acid / Q000494:pharmacology; D019826:Cholic Acid / Q000633:toxicity; D016798:Ciliophora / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D016770:Ciliophora Infections / Q000662:veterinary*; D003840:Deoxycholic Acid / Q000633:toxicity; D004305:Dose-Response Relationship, Drug; D004789:Enzyme Activation / Q000187:drug effects; D005393:Fish Diseases / Q000469:parasitology*; D005432:Flounder; D008095:Lithocholic Acid / Q000494:pharmacology; D010447:Peptide Hydrolases / Q000378:metabolism*; D018709:Statistics, Nonparametric
chemical_list: D001647:Bile Acids and Salts; D003840:Deoxycholic Acid; D002635:Chenodeoxycholic Acid; D008095:Lithocholic Acid; D010447:Peptide Hydrolases; D019826:Cholic Acid