title: Ontogenetic taurine biosynthesis ability in rainbow trout (Oncorhynchus mykiss).
abstract: Taurine (2-aminoethane sulfonic acid) plays important roles in multiple physiological processes including osmoregulation, bile salt conjugation and membrane protection. It is known that taurine biosynthesis varies in different fish species. However, its ontogenetic regulation has not been clear. In the present study, we found that the hepatic concentrations of taurine increased marginally with rainbow trout growth. The mRNA expression, protein levels and enzyme activities of key enzymes involved in taurine biosynthesis, cysteine dioxygenase (CDO) and cysteine sulfinate decarboxylase (CSD), were analyzed. Our results showed that the mRNA levels and protein abundances of CSD increased dramatically with the development of rainbow trout stages while the enzyme activities showed a slight improvement. However, the expression and activities of CDO decreased with rainbow trout growth. These results provide valuable information on defining the exact supplementation of taurine in diets for different stages of rainbow trout and give new insights into elucidating the regulation of taurine metabolism in rainbow trout.
authors.affiliation: Key laboratory of Aquaculture Nutrition (Ministry of Agriculture), Ocean University of China, Qingdao 266003, PR China.
authors.forename: Xuan
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key laboratory of Aquaculture Nutrition (Ministry of Agriculture), Ocean University of China, Qingdao 266003, PR China. Electronic address: hegen@ouc.edu.cn.
authors.forename: Gen
authors.initials: G
authors.lastname: He
authors.affiliation: Key laboratory of Aquaculture Nutrition (Ministry of Agriculture), Ocean University of China, Qingdao 266003, PR China.
authors.forename: Kangsen
authors.initials: K
authors.lastname: Mai
authors.affiliation: Key laboratory of Aquaculture Nutrition (Ministry of Agriculture), Ocean University of China, Qingdao 266003, PR China.
authors.forename: Wei
authors.initials: W
authors.lastname: Xu
authors.affiliation: Key laboratory of Aquaculture Nutrition (Ministry of Agriculture), Ocean University of China, Qingdao 266003, PR China.
authors.forename: Huihui
authors.initials: H
authors.lastname: Zhou
mesh_terms: D000818:Animals; D049628:Body Size; D002262:Carboxy-Lyases / Q000235:genetics; D050558:Cysteine Dioxygenase / Q000235:genetics; D018507:Gene Expression Regulation, Developmental; D008099:Liver / Q000201:enzymology / Q000378:metabolism; D009024:Morphogenesis; D017686:Oncorhynchus mykiss / Q000254:growth & development* / Q000378:metabolism*; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013654:Taurine / Q000096:biosynthesis*
chemical_list: D012333:RNA, Messenger; D013654:Taurine; D050558:Cysteine Dioxygenase; D002262:Carboxy-Lyases; C019972:sulfoalanine decarboxylase
keywords: CDO; CSD; Ontogenetic development; Rainbow trout; Taurine biosynthesis