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The histochemical localization of steroid binding sites in the pituitary gland of a teleost (the platyfish)

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Specific binding sites for estrogen, testosterone, and progesterone have been demonstrated in the pituitary gland of mature male and female platyfish (Xiphophorus maculatus). With a histochemical procedure, fluorescent-steroid-hormone conjugates were localized in the cytoplasm and nucleus of the gonadotrops of the caudal pars distalis (CPD) and in cells of the pars intermedia (PI) previously demonstrated to contain immunoreactive gonadotropin. The specificity of the response was confirmed by means of competitive binding analyses and by using fluoresceinated BSA not linked to steroids. The physiological significance of steroid binding in the PI, as well as in the CPD, is discussed in the light of other recent studies on the pituitary gland of the platyfish.

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Correspondence to Martin P. Schreibman.

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Schreibman, M.P., Pertschuk, L.P., Rainford, E.A. et al. The histochemical localization of steroid binding sites in the pituitary gland of a teleost (the platyfish). Cell Tissue Res. 226, 523–530 (1982). https://doi.org/10.1007/BF00214781

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Key words

  • Steroid binding
  • Pituitary gland
  • Teleost
  • Histochemistry