Journal
GENERAL AND COMPARATIVE ENDOCRINOLOGY
Volume 187, Issue -, Pages 104-116Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ygcen.2013.03.030
Keywords
Kisspeptin system; GnRH-gonadotropin system; Hypothalamus; Pituitary; Maturation; Teleost
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Funding
- Spanish Ministry of Science and Innovation (MICINN) [CSD2007-00002, AGL2009-11086]
- Spanish Ministry of the Economy and Competitiveness
- FPI fellowship from the MICINN and the Ministry of the Economy and Competitiveness (Spain) [PROMETE0/2010/003]
- Regional Government of Valencia
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Kisspeptins play a critical role in the control of hypothalamic-gonadotropic function and puberty onset in mammals. Studies in fish have all supported the hypothesis that they might play similar roles in the reproduction of this animal group, however, their physiological relevance in the occurrence of key reproductive events still remains to be determined. This study examines the relative mRNA expression profiles of the duplicate kisspeptin system (kiss1, kiss2, gpr54-1b, and gpr54-2b) in the hypothalamus and pituitary of adult male and female sea bass (Dicentrarchus labrax L.) during different gonadal stages using qRT-PCR. We also report the changes in the expression levels of gnrh-1, gnrhr-II-la, fshe beta, and lh beta and the relationships observed between both kisspeptin and GnRH systems. Our data show clear sex differences in the dynamics of kisspeptin and kisspeptin receptor gene expression in the hypothalamus of sea bass during gonadal development. Overall, all four kisspeptin system genes increased either before or during the advanced stages of oogenesis and declined during atresia, exhibiting profiles that are identical to those observed for gnrhr-II-1a, fsh beta, lh beta, and the gonadosomatic index (GSI). While the situation was not as clear in males, the high kiss2 expression levels observed in the hypothalamus during mid recrudescence suggest that it might be playing a role in the neuroendocrine signaling that regulates germ cell proliferation at the testicular level. In this sense, the proposed role attributed to kisspeptins as key factors in the onset of reproduction in fish receives an additional support from the data obtained in the present work. Nevertheless, further research is required to clarify their precise role in sea bass. (C) 2013 Elsevier Inc. All rights reserved.
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