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Letters to Nature
Nature 255, 497 - 498 (05 June 1975); doi:10.1038/255497a0

Effects of oestrogen and bromocryptine on in vivo secretion and mitosis in prolactin cells

H. M. LLOYD, J. D. MEARES & JOAN JACOBI

Department of Medicine, University of Queensland, Clinical Sciences Building, Royal Brisbane Hospital, Brisbane 4029, Australia

THE response of the rat pituitary gland to oestrogen includes increased mitotic and secretory activity affecting several of the cell types in the anterior lobe but leading in particular to proliferation of prolactin cells1. Bromocryptine inhibits release of prolactin2,3 and also inhibits DNA synthesis in the oestrogen-stimulated pituitary gland4. In studying the pituitary response to oestrogen during a prolonged period of bromocryptine inhibition, we have observed a close relationship between effects on serum prolactin levels and on pituitary mitotic activity. Our findings lend support to the idea that secretory behaviour influences mitotic activity in prolactin cells4.

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References

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4. Davies, C., Jacobi, J., Lloyd, H. M., and Meares, J. D., J. Endocr., 61, 411–417 (1974).
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