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1 June 2000 Activin, Inhibin, and Follistatin in Zebrafish Ovary: Expression and Role in Oocyte Maturation
Tingting Wu, Hiral Patel, Spencer Mukai, Columba Melino, Rami Garg, Xueying Ni, Jianbo Chang, Chun Peng
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Abstract

Activins, inhibins, and follistatins are important regulators of mammalian reproduction. However, their roles in lower vertebrates are poorly understood. In this study, we examined the expression of activin A, inhibin A, and follistatins in the zebrafish ovary and determined their role in final oocyte maturation. Using reverse transcription-polymerase chain reaction with primers specific for activin/inhibin βA subunit and for follistatins, we detected DNA fragments of the expected size, which, upon sequencing, conformed to activin/inhibin βA and follistatin. Western blot analysis using an antibody against activin/inhibin βA subunit revealed two bands with sizes similar to those of activin A and inhibin A. The expression of follistatins was also confirmed by Western blot analysis. These results suggest that activin A, an inhibin A-like molecule, and follistatins are expressed in the zebrafish ovary. In cultured zebrafish follicles, activin A and inhibin A both induced final oocyte maturation in a dose-dependent manner. The effects of activin A and inhibin A were blocked by their binding protein, follistatin-288. Interestingly, follistatin-288 also inhibited final oocyte maturation induced by gonadotropin and by maturation-inducing hormone (MIH), suggesting that activin A and/or inhibin A may be local regulators mediating gonadotropin- and MIH-induced final oocyte maturation. Taken together, these findings suggest that activin A and inhibin A are paracrine regulators of ovarian functions in fish.

Tingting Wu, Hiral Patel, Spencer Mukai, Columba Melino, Rami Garg, Xueying Ni, Jianbo Chang, and Chun Peng "Activin, Inhibin, and Follistatin in Zebrafish Ovary: Expression and Role in Oocyte Maturation," Biology of Reproduction 62(6), 1585-1592, (1 June 2000). https://doi.org/10.1095/biolreprod62.6.1585
Received: 11 November 1999; Accepted: 1 January 2000; Published: 1 June 2000
JOURNAL ARTICLE
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