Bidirectional Sex Change Induced by Sex Steroid Implantation in the Hermaphrodite Fish, Pseudolabrus sieboldi

• Published in: Journal of experimental zoology. Part A, Ecological genetics and physiology Vol. 317; no. 9; pp. 552 - 560
• Main Authors: Ohta, Kohei, Sakai, Mami, Sundaray, Jittendra Kumar, Kitano, Takeshi, Takeda, Tatsusuke, Yamaguchi, Akihiko, Matsuyama, Michiya
• Format: Journal Article
• Language: English
• Published: United States Blackwell Publishing Ltd 01.11.2012
• Subjects: Analysis of Variance; Animals; Drug Implants; Enzyme-Linked Immunosorbent Assay; Female; Gonadal Steroid Hormones - administration & dosage; Gonadal Steroid Hormones - pharmacology; Gonads - anatomy & histology; Gonads - drug effects; Immunoenzyme Techniques; Male; Perciformes - physiology; Pigmentation - drug effects; Pigmentation - physiology; Sex Determination Processes - drug effects; Sex Determination Processes - physiology
• ISSN: 1932-5223; 1932-5231
• DOI: 10.1002/jez.1747

Sex steroids have been suggested to be involved in gonadal sex change in hermaphrodite fish. Aromatase, the enzyme that catalyzes the conversion of androgens into estrogens, is a principal enzyme regulating gonadal sex. However, the detailed functions of each steroid hormone remain to be evaluated. Recent studies have demonstrated that estradiol‐17β (E2) is synthesized via estrone (E1) in some hermaphrodite species. On the other hand, 11‐ketotestosterone (11KT) is produced in the testis via testosterone (T). In this study, we hypothesized that E1 and T are also involved in the sex change as precursors for E2 and 11KT, respectively. We implanted females of the wrasse, Pseudolabrus sieboldi, with T and 11KT, and males with E1 and E2, by use of sustained‐release capsules. In females, testicular tissues and body color change were observed after androgen administration, in which 11KT was more effective than T. In contrast, after estrogen administration, the gonads of males contained oocytes. In females, the administration of T and 11KT resulted in reduced serum E2 levels. Conversely, serum 11KT levels decreased in the E1‐ and E2‐treated males. Thus, we successfully induced bidirectional sex change in the gonad by estrogen and androgen administration in vivo. Moreover, this study raises the possibility that E1 and T are involved in the sex change as precursors for E2 and 11KT, respectively. J. Exp. Zool. 317A:552–560, 2012. © 2012 Wiley Periodicals, Inc.