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Responses of the teleost pituitary (goldfish, eel) to deionized water

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Summary

The cytological responses of the pituitary gland during adaptation to deionized water (DW) were investigated in the goldfish and the eel. In both teleost species, a stimulation of the prolactin (PRL) cells could not be detected, although the levels of blood electrolytes (Na+,Ca2+,Cl−) are reduced in the eel. PRL cells appear less active in DW-adapted eels. A striking stimulation of the PAS-positive cells of the pars intermedia occurs in both species after 3 weeks and, in the eel, is still present after 11 weeks. Cell and nuclear hypertrophy, mitoses and a well-developed endoplasmic reticulum are observed. MSH cells are partially degranulated when pigmentation is affected; a reduced activity of MSH cells is evident after 11 weeks. The amount of neurohypophysial tissue is reduced. In the goldfish and the eel, during adaptation to DW, an unknown factor secreted by the PAS-positive cells of the pars intermedia appears to play a more important role than the secretion of PRL. These two species are able to survive in fresh water without the pituitary. The control of the PAS-positive cells by external sodium or calcium is discussed.

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Authors and Affiliations

  1. Laboratoire de Physiologie, Institut Océanographique, 195, rue Saint-Jacques, F-75005, Paris, France

    Madeleine Olivereau

  2. Laboratoire d'Immunologie Comparée, France

    Christian Aimar

  3. Laboratoire de Psychophysiologie, Université P. et M. Curie, Paris, France

    Jean-Michel Olivereau

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  1. Madeleine Olivereau
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  2. Christian Aimar
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  3. Jean-Michel Olivereau
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Olivereau, M., Aimar, C. & Olivereau, JM. Responses of the teleost pituitary (goldfish, eel) to deionized water. Cell Tissue Res. 208, 389–404 (1980). https://doi.org/10.1007/BF00233872

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