[Ultrastructural changes in the pituitary gonadotropic cells under the action of estrogens in rats. Contribution to the study of the topical origin of gonadostimulins].
Ultrastructural changes in the pituitary gonadtropic LH and FSH cells have been studied in 4-day cyclic female rats injected with estradiol benzoate (EB) on the morning of diestrus I. A granular release in both LH and FSH cells was observed during the night following diestrus II in the females which displayed estrogen-induced luteinization. LH cells only appeared degranulated in the females unresponsive to EB. These results confirmed previous light microscopic observations (Hassani and Plas-Roser, 1975). The origin of LH and FSH from one or two categories of pituitary cells was discussed in the light of these observations. The FSH cell was assumed to be involved in the secretion of both gonadotropic hormones. However a role of LH cells in the production of LH was suggested by the present observations.
D000818:Animals; D004958:Estradiol / Q000494:pharmacology; D004967:Estrogens / Q000502:physiology*; D004971:Estrus; D005260:Female; D005640:Follicle Stimulating Hormone / Q000378:metabolism*; D007986:Luteinizing Hormone / Q000378:metabolism*; D010053:Ovary / Q000166:cytology / Q000187:drug effects; D010903:Pituitary Gland, Anterior / Q000187:drug effects / Q000648:ultrastructure*; D011247:Pregnancy; D051381:Rats
D004967:Estrogens; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone
Modifications ultrastructurales des cellules gonadotropes pituitaires sous laction des oestrogènes chez la ratte. Contribution à l'étude de l'origine topique des gonadostimulines.