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Endocrinology, Vol 116, 90-94, Copyright © 1985 by Endocrine Society

ARTICLES

Effect of epidermal growth factor on the development of rat gastric mucosa

AB Dembinski and LR Johnson

Epidermal growth factor (EGF) has been shown to stimulate the growth of adult rat gastric mucosa and to increase DNA synthesis of mouse small and large intestinal mucosa. This study examines whether EGF affects the functional and structural development of the rat gastric mucosa. Rats were injected with 20 micrograms/kg EGF three times/day for 5 days beginning on the 10th day after birth. A control group of animals received saline injections of identical volume. All rats were killed on day 15. EGF significantly increased the weight of the whole stomach and the DNA, RNA, and protein content of the oxyntic gland mucosa, but had no effect on the RNA/DNA ratio, or antral and serum gastrin levels. Two groups of similarly treated rats, were anesthetized with ether, pylorus- ligated, and injected with either saline or pentagastrin (250 micrograms/kg) after they had recovered from anesthesia. EGF-treated rats had significantly higher rates of basal acid secretion and pentagastrin-stimulated acid secretion than the saline-treated controls. EGF, however, did not alter basal or pentagastrin-stimulated pepsin secretion nor did it change mucosal pepsinogen content. These results indicate that EGF stimulates oxyntic mucosal growth in unweaned rats but that it does not lead to precocious maturation or functional development.


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