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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 43 (1987), S. 300-302 
    ISSN: 1420-9071
    Keywords: GABA ; immunocytochemistry ; anterior pituitary ; neuroendocrine control ; teleost
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The anterior pituitary of teleosts is unique among vertebrates in receiving a direct innervation which represents the morphological support of the neuroendocrine control of pars distalis functions. The participation of GABAergic fibers in this innervation was studied by means of immunocytochemistry at the light and electron microscopic levels, using antibodies against GABA. Immunoreactive fibers, characterized by the presence of small clear and dense cored vesicles, were detected in all parts of the gland. Immunopositive terminals were found in close, sometimes synaptic-like, contact with most glandular cell types in the anterior lobe. The data strongly suggest that in teleosts, as in mammals, GABA is involved in the neuroendocrine control of anterior pituitary functions.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fish physiology and biochemistry 11 (1993), S. 85-98 
    ISSN: 1573-5168
    Keywords: gonadotropin control ; pituitary ; melatonin ; steroids ; reproduction ; teleost ; fish
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Chez les Poissons, comme chez tous les Vertébrés, le cerveau est activement impliqué dans les mécanismes de contrôle de la reproduction d'une part, en participant, sous l'influence des facteurs du milieu, à l'établissement d'un état endocrinien adéquat, mais aussi en permettant la synchronisation des individus au moment de la ponte. Il est actuellement bien établi que la régulation de l'activité gonadotrope hypophysaire est multifactorielle et placée sous la dépendance de facteurs inhibiteurs et excitateurs essentiellement originaires de la région préoptique et de l'hypothalamus médiobasal, régions cibles pour les stéroides sexuels. Les mécanismes impliqués dans la transmission de l'information provenant des milieux extérieurs et intérieurs sont moins bien connus. Des résultats récents suggèrent que les androgènes et la mélatonine, connus pour provoquer des réponses comportementales et endocriniennes, agissent au niveau de territoires neuroendocriniens, mais aussi au niveau des systèmes sensoriels qui constituent également les sites d'action des facteurs externes. Dans cet article, nous avons tenté de résumer et d'intégrer les données récentes de la littérature se rapportant au cerveau en tant que participant essentiel des mécanismes endocriniens et comportementaux liés à la reproduction chez les Poissons.
    Notes: Abstract In fish as in other vertebrates, the brain is actively involved in the control of reproduction, first by participating, under the influence of external factors, in the establishment of an appropriate endocrine status, but also by allowing synchronization of the partners by the time of spawning. It is now well established that the pituitary gonadotropic function is controlled by multiple stimulatory and inhibitory factors, originating mainly from the preoptic region and the mediobasal hypothalamus, both target regions for sexual steroids. Little is known about the mechanisms involved in the mediation of external and internal factors, however there is indication that internal factors, such as androgens and melatonin, known to trigger particular behavioural and endocrine responses, act both at the level of neuroendocrine territories, but also on sensorial systems, which are the actual sites of action for external factors. This paper represents an attempt to summarize and integrate the recent literature devoted to the different aspects of the brain as a major participant in the complex endocrine and behavioural mechanisms of reproduction in fish.
    Type of Medium: Electronic Resource
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