title: Response of sulfide:quinone oxidoreductase to sulfide exposure in the echiuran worm Urechis unicinctus.
abstract: Sulfide is a natural, widely distributed, poisonous substance, and sulfide:quinone oxidoreductase (SQR) is responsible for the initial oxidation of sulfide in mitochondria. In this study, we examined the response of SQR to sulfide exposure (25, 50, and 150 μM) at mRNA, protein, and enzyme activity levels in the body wall and hindgut of the echiuran worm Urechis unicinctus, a benthic organism living in marine sediments. The results revealed SQR mRNA expression during sulfide exposure in the body wall and hindgut increased in a time- and concentration-dependent manner that increased significantly at 12 h and continuously increased with time. At the protein level, SQR expression in the two tissues showed a time-dependent relationship that increased significantly at 12 h in 50 μM sulfide and 6 h in 150 μM, and then continued to increase with time while no significant increase appeared after 25 μM sulfide exposure. SQR enzyme activity in both tissues increased significantly in a time-dependent manner after 50 μM sulfide exposure. We concluded that SQR expression could be induced by sulfide exposure and that the two tissues studied have dissimilar sulfide metabolic patterns. A U. unicinctus sulfide-induced detoxification mechanism was also discussed.
authors: Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao 266003, China.
authors: Yu-Bin
authors: YB
authors: Ma
authors: Zhi-Feng
authors: ZF
authors: Zhang
authors: Ming-Yu
authors: MY
authors: Shao
authors: Kyoung-Ho
authors: KH
authors: Kang
authors: Xiao-Li
authors: XL
authors: Shi
authors: Ying-Ping
authors: YP
authors: Dong
authors: Jin-Long
authors: JL
authors: Li
mesh_terms: D000818:Animals; D000845:Annelida / Q000201:enzymology*; D017931:DNA Primers / Q000235:genetics; D004305:Dose-Response Relationship, Drug; D015971:Gene Expression Regulation, Enzymologic / Q000187:drug effects*; D008958:Models, Molecular; D011808:Quinone Reductases / Q000235:genetics / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D013440:Sulfides / Q000633:toxicity*; D013997:Time Factors
chemical_list: D017931:DNA Primers; D013440:Sulfides; D011808:Quinone Reductases; C073412:sulfide quinone reductase