title: Photoperiod modulates the reproductive axis of European sea bass through regulation of kiss1 and gnrh2 neuronal expression.
abstract: The onset of puberty is characterized by activation of the brain-pituitary-gonad axis. However, the molecular and endocrine mechanism involved in the process of puberty and the influence of environmental conditions, such as photoperiod signalling, are not well understood in fish. In this study, 1-year-old male European sea bass (Dicentrarchus labrax) were exposed to photoperiod manipulation in combination with size-sorting. Two treatment groups, a puberty accelerating photoperiod (AP) group and a continuous light (LL) group, were studied from August to February. Our results indicate that AP and LL are able to entrain the rhythms of both kiss1 and gnrh2 mRNA levels in the brain, while kiss2 and gnrh1 mRNA expression does not seem to be directly affected by the photoperiod, at least during testicular growth. It is likely that AP and LL photoperiod regimes affected both plasma Fsh and 11-KT profiles, which might explain, respectively, the phase shift and reduction of testes maturation seen under these conditions. We therefore hypothesize that the unbalanced production of this androgen regulated by circulating Fsh might be limiting the stimulation of germ cell proliferation in European sea bass males. In summary, our study establishes that photoperiod modulates the expression of kiss1 and gnrh2 in the forebrain-midbrain, which may be involved in the translation of the light stimulus to activate the reproductive axis.
authors.affiliation: Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal (IATS), Consejo Superior de Investigaciones Científicas (CSIC), 12595 Ribera de Cabanes, s/n, Castellón, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Espigares
authors.affiliation: Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal (IATS), Consejo Superior de Investigaciones Científicas (CSIC), 12595 Ribera de Cabanes, s/n, Castellón, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Rocha
authors.affiliation: Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal (IATS), Consejo Superior de Investigaciones Científicas (CSIC), 12595 Ribera de Cabanes, s/n, Castellón, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Gómez
authors.affiliation: Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal (IATS), Consejo Superior de Investigaciones Científicas (CSIC), 12595 Ribera de Cabanes, s/n, Castellón, Spain. Electronic address: m.carrillo@csic.es.
authors.forename: M
authors.initials: M
authors.lastname: Carrillo
authors.affiliation: Department of Fish Physiology and Biotechnology, Instituto de Acuicultura de Torre la Sal (IATS), Consejo Superior de Investigaciones Científicas (CSIC), 12595 Ribera de Cabanes, s/n, Castellón, Spain. Electronic address: s.zanuy@csic.es.
authors.forename: S
authors.initials: S
authors.lastname: Zanuy
mesh_terms: D000818:Animals; D001492:Bass / Q000378:metabolism*; D007987:Gonadotropin-Releasing Hormone / Q000031:analogs & derivatives / Q000378:metabolism*; D059648:Kisspeptins / Q000378:metabolism*; D008297:Male; D017440:Photoperiod; D012098:Reproduction / Q000502:physiology*; D012733:Sex Differentiation; D012741:Sexual Maturation / Q000502:physiology*
chemical_list: C106628:KISS1 protein, human; D059648:Kisspeptins; D007987:Gonadotropin-Releasing Hormone
keywords: Androgens; Gonadotropin-releasing hormone; Gonadotropins; Kisspeptin; Photoperiod; Puberty; Teleost