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Science 29 August 1986:
Vol. 233. no. 4767, pp. 975 - 977
DOI: 10.1126/science.3090686
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Articles

Science, Vol 233, Issue 4767, 975-977
Copyright © 1986 by American Association for the Advancement of Science

articles

A physiological role of epidermal growth factor in male reproductive function

O Tsutsumi, H Kurachi, and T Oka

Epidermal growth factor (EGF) stimulates the proliferation of various mammalian cells in culture, but its physiological role is not well defined. In mature male mice, large amounts of EGF are produced in the submandibular gland; it is present in the circulation at approximately 5 nanograms of EGF per milliliter of plasma. Sialoadenectomy (removal of the submandibular glands) decreased the amount of circulating EGF to an undetectable level but did not affect the circulating levels of testosterone or follicle-stimulating hormone. The number of mature sperm in the epididymis decreased by as much as 55 percent; the number of spermatids in the testis decreased by 40 to 50 percent; and the number of spermatocytes increased by about 20 percent. Administration of EGF to sialoadenectomized mice restored both the sperm content of the epididymis and the number of spermatids in the testis to normal. Thus, EGF may play a role in male reproductive function by stimulating the meiotic phase of spermatogenesis.


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