Endocrinology, Vol 124, 552-554, Copyright © 1989 by Endocrine Society

ARTICLES

Production and regulation of inhibin subunits in pituitary gonadotropes

V Roberts, H Meunier, J Vaughan, J Rivier, C Rivier, W Vale and P Sawchenko
Laboratory of Neuronal Structure and Function, Salk Institute for Biological Studies, La Jolla, CA 92037.

Two related proteins, inhibin and activin, are produced and secreted by the gonads and act at the pituitary to regulate FSH secretion. In the present study, the alpha and beta B, but not the beta A, polypeptide subunits of inhibin were localized in the cytoplasm of FSH- and LH- immunoreactive (ir) gonadotropes. Ovariectomy (OVX) increased the size and number of cells immunoreactive for inhibin-alpha and -beta B as well as the mRNAs encoding these subunits. Treatment with estrogen prevented these effects. These results suggest that pituitary gonadotropes are sources, as well as targets, of inhibin-related peptides, whose expression in the pituitary is modulated by ovarian factors.

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