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Photoperiodic signalling mediates the control of kiss1 and Gnrh2 neuronal populations on the reproductive Axis in a teleost fish, European sea bass (Dicentrarchus labrax)

AuthorsEspigares, F. ; Rocha, Ana; Gómez, Ana ; Carrillo, Manuel ; Zanuy, Silvia
Issue Date23-Sep-2015
Citation10º Congreso de la Asociación Ibérica de Endocrinología Comparada (2015)
AbstractThere are a wide variety of environmental factors that change seasonally and that may modulate the activity of the reproductive axis. Of all, photoperiod is the main environmental signal that most temperate fish species use to predict the changing seasons and therefore anticipate spawning time through activation of neuroendocrine pathways which, in turn, stimulate gonadotropic axis and gonadal growth. However, many molecular and endocrine mechanism involved in the onset 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 three different photoperiod conditions, natural photoperiod (NP), advanced photoperiod (AP) and continuous light (LL) in combination with size-sorting and studied from August to February. The obtained results clearly indicated that AP and LL were able to train the rhythms of both kiss1 and gnrh2 mRNA levels in the forebrainmidbrain (FB-MB), suggesting that the photoperiodic signalling may modulate the activity of the habenular Kiss1 and the synencephalic Gnrh2 neurons to drive reproductive axis. Also AP and LL regimes affected both plasma Fsh and 11-KT profiles, which in turn would explain the phase shift and reduction of gonadal recrudescence under AP and LL, respectively. In conclusion, the present study reveals a strong relation between environmental control of puberty and the Kiss1 and Gnrh2 systems in agreement with previous ?ndings observed in other teleost species, including European sea bass. We also hypothesize that very likely, as a result of the modulatory role of the photoperiod on the Kiss1 and Gnrh2 activity, this is able to shift the hormone profiles and hence advance the onset and progression of gametogenesis under AP, whereas under LL, the unbalanced production of 11-KT, regulated by an altered Fsh profile, could be limiting the stimulation of germ cell proliferation at the testicular level and thus prevent the normal progression of the spermatogenesis.
DescriptionTrabajo presentado en el 10º Congreso de la Asociación Ibérica de Endocrinología Comparada (AIEC), celebrado en Castellón (España), del 23 al 25 de septiembre de 2015
Appears in Collections:(IATS) Comunicaciones congresos
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