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Immunocytological localization of LH, FSH, TSH and their subunits in the pituitary of normal and anencephalic human fetuses

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Summary

Immunostaining with antisera to oLH, hCG, hLH, pLHβ, hFSH, hFSHβ, hTSHα and bTSH was used to delineate the gonadotropic and thyrotropic cells of the human fetal anterior pituitary. Hypophyses from 29 normal fetuses, 3 newborn infants, and 5 totally ancencephalic fetuses were used. Several controls to check for the specificity of the immunocytological reaction were made.

In normal fetuses, observations showed that: 1) the α subunit was detected from the eighth week and throughout gestation without sex differences; 2) intact LH was detected during the third month, however, age and sex differences were observed during the fourth and fifth months; 3) intact FSH was detected in female fetuses from the beginning of the fourth month, a sex difference was observed; 4) LH and FSH were detected in the same cells; 5) the thyrotropic cells were detectable from 15 weeks of gestation and their number increased during gestation without sex difference; 6) at birth the gonadotropic cells were scarce and were located in the ventromedian zone of the anterior pituitary, while the thyrotropic cells remained numerous and were located in the dorsomedian zone.

In anencephalic fetuses: 1) the α subunit existed at each stage studied; 2) the reaction induced by anti-pLHβ and anti-hFSHβ sera was always very weak regardless of sex or age; 3) the thyrotropic cells were more numerous in comparison to the gonadotropic cells. These data are discussed in terms of the relationship of the hypophysiotropic hypothalamic factors to the appearance and evolution of the glycoprotein hormones and their subunits.

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Authors and Affiliations

  1. Laboratoire d'Histologie et Embryologie, U.E.R. Médicale Lyon Sud-Ouest, Oullins, France

    P. M. Dubois & M. Begeot

  2. Station de Physiologie de la Reproduction, I.N.R.A., Nouzilly, France

    M. P. Dubois

  3. Department of Anatomy, The University of Texas, Health Science Center at San Antonio, San Antonio, Texas, USA

    D. C. Herbert

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  1. P. M. Dubois
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  2. M. Begeot
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  3. M. P. Dubois
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  4. D. C. Herbert
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Dubois, P.M., Begeot, M., Dubois, M.P. et al. Immunocytological localization of LH, FSH, TSH and their subunits in the pituitary of normal and anencephalic human fetuses. Cell Tissue Res. 191, 249–265 (1978). https://doi.org/10.1007/BF00222423

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