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• W2051206014 abstract "ResumeL'etude histologique de diverses glandes endocrines et du rein est realisee chez l'Anguille apres autotransplantation de l'hypophyse dans la musculature dorsale et apres hypophysectomie.La glande thyroide est fortement hypoactive dans 25 pour cent des Anguilles greffees comme chez celles hypophysectomisees; elle est d'aspect subnormal ou normal chez les autres animaux ou les cellules thyreotropes sont presentes dans le greffon. Malgre une variabilite plus grande que chez les temoins, dans aucun cas on ne peut parler d'une hyperactivite similaire a celle observee chez Poecilia. Comme le nombre des cellules thyreotropes est toujours reduit dans le transplant, il semblerait qu'une secretion basale de cette hormone suffise a maintenir une activite thyroidienne notable. La fonction thyreotrope serait donc plus independante du controle hypothalamique que chez les Mammiferes, sans que la notion de TIF (facteur inhibiteur) paraisse valable chez l'Anguille.L'interrenal est aussi tres atrophie apres hypophysectomie. Au contraire, apres autogreffe, il conserve une structure proche de celle des temoins dans tous les cas, bien que moins homogene, malgre la reduction du nombre des cellules corticotropes dans le greffon. La vacuolisation cytoplasmique parfois notable pourrait indiquer un leger ralentissement de l'activite fonctionnelle de l'interrenal. Le controle hypothalamique ne semble donc pas s'exercer etroitement sur l'axe hypophyso-surrenalien de l'Anguille.Les organes de Syrski restent tres peu differencies, en accord avec la regression des cellules gonadotropes dans le greffon, montrant la necessite d'une stimulation d'origine hypothalamique pour le maintien de la fonction gonadotrope.Les corpuscules de Stannius sont similaires pour les 3 groupes d'Anguilles, l'hypophysectomie n'ayant pas d'effet net chez le mâle apres 2 mois.L'atrophie renale consecutive a l'hypophysectomie est fortement attenuee chez les Anguilles autogreffees, donnee qui suggere l'idee d'une secretion de prolactine par le transplant hypophysaire dont les cellules a prolactine apparaissent stimulees.En general, l'hypophyse deconnectee de l'Anguille conserve une autonomie fonctionnelle beaucoup plus marquee que chez les Vertebres superieurs, sauf pour la secretion gonadotrope.AbstractHistological structure of some endocrine glands in the eel after auto-transplantation of the pituitary gland.The histological picture of various endocrines and of the kidney is described in control and hypophysectomized eels (Anguilla anguilla L.) and after autotransplantation of the pituitary in the dorsal muscle.The thyroid gland is greatly hypoactive in 3 grafted eels as well as in the hypophysectomized ones. It keeps a normal or subnormal picture in the other animals where thyrotrophic cells are still present in the graft. Although a higher variability is detected compared with control animals, in no case one can speak of a hyperactivity similar to that occuring in Poecilia. As the number of the thyrotrophic cells is always reduced in the transplant, it would seem that a basal secretion of this hormone would be sufficient to maintain some thyroidal activity. The thyrotropic function would appear more independent of a hypothalamic control than in mammals, however the concept of a TIF (inhibiting factor) does not seem to apply to the eel.Also, the interrenal is greatly atrophic after hypophysectomy. On the countrary, after autotransplantation, it keeps a structure less homogeneous, but closely similar to that of control eels in all cases, in spite of a reduction of the corticotrophic cell number in the graft. The cytoplasmic vacuolization which sometimes may occur in the interrenal cells might indicate a slowing down of the functional activity. In the eel, the hypophyso-interrenal axis does not seem to be strictly dependent of a hypothalamic control.The organs of Syrski (male gonads) remain poorly differentiated in agreement with the regression of the gonadotrophic cells in the graft, indicating the necessity of a hypothalamic stimulation for the maintenance of the gonadotrophic function.The corpuscles of Stannius are similar in the 3 groups, and within 2 months, they are not yet affected by hypophysectomy.In grafted eels, the histological picture of the kidney is intermediary between that of intact and hypophysectomized animals. As ovine prolactin partly prevents the renal atrophy induced after hypophysectomy, and as prolactin cells appear very active in all the transplants despite their reduced number, some prolactin secretion probably occurs.In summary, the disconnected pituitary of the eel keeps a functional autonomy much more important than in higher vertebrates, the gonadotrophic function being excluded, in agreement with the cytological study of the transplant." @default.
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• W2051206014 date "1971-06-01" @default.
• W2051206014 modified "2023-09-27" @default.
• W2051206014 title "Structure histologique de quelques glandes endocrines de l'anguille après autotransplantation de l'hypophyse" @default.
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• W2051206014 doi "https://doi.org/10.1111/j.1463-6395.1971.tb00549.x" @default.
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