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Cloning and characterization of a cDNA encoding cholesterol side-chain cleavage cytochrome P450 (CYP11A1) : Tissue-distribution and changes in the transcript abundance in ovarian tissue of Japanese eel, Anguilla japonica, during artificially induced sexual development

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Title: Cloning and characterization of a cDNA encoding cholesterol side-chain cleavage cytochrome P450 (CYP11A1) : Tissue-distribution and changes in the transcript abundance in ovarian tissue of Japanese eel, Anguilla japonica, during artificially induced sexual development
Authors: Kazeto, Yukinori Browse this author
Ijiri, Shigeho Browse this author →KAKEN DB
Adachi, Shinji Browse this author
Yamauchi, Kohei Browse this author
Keywords: P450scc
CYP11A1
Steroidogenic enzyme
Ovary
Head kidney
Japanese eel
Issue Date: May-2006
Publisher: Elsevier
Journal Title: The Journal of Steroid Biochemistry and Molecular Biology
Volume: 99
Issue: 2-3
Start Page: 121
End Page: 128
Publisher DOI: 10.1016/j.jsbmb.2005.12.004
PMID: 16616842
Abstract: Cholesterol side chain cleavage cytochrome P450 (CYP11A1: P450scc) is a crucial steroidogenic enzyme that catalyzes an initial step in the production of all classes of steroids. A cDNA encoding Japanese eel P450scc was cloned and characterized. The cDNA putatively encoded 521 amino acid residues with high homology to those of other vertebrate forms. The recombinant P450scc produced in COS-7 cells efficiently catalyzed the conversion of 25-hydroxycholesterol into pregnenolone. By northern blot, a single P450scc transcript of approximately 3.3 kb was detected in both ovary and head kidney. Transcript levels of this enzyme significantly increased throughout ovarian development artificially induced by salmon pituitary homogenate, which suggests that gonadotropic stimuli can induce ovarian expression of the P450scc gene in teleosts, as has been reported in mammals. Furthermore, RT-PCR analysis revealed that gene expression of three steroidogenic enzymes, P450scc, P450c17 and 3β-hydroxysteroid dehydrogenase (3β-HSD) show distinctly different tissue specific patterns of expression in the Japanese eel. The P450scc gene was expressed in ovary and head kidney while the sole source of the P450c17 transcript was ovary. In contrast, 3β-HSD transcript was detected in all tissues examined, brain, liver, spleen and trunk kidney, etc. These suggest that some steroidogenic enzymes are also expressed in non-endocrine tissues and could potentially regulate the local and/or circulating steroid levels in teleosts, as they do in mammals.
Relation: http://www.sciencedirect.com/science/journal/09600760
Type: article (author version)
URI: http://hdl.handle.net/2115/14404
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 風藤 行紀

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