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Article

Early Weaning and Prolonged Nursing Induce Changes in Cell Proliferation in the Gastric Epithelium of Developing Rats¹

Department of Histology and Embryology, Biomedical Sciences Institute, University of São Paulo, São Paulo, Brazil 05508–900.

²To whom correspondence should be addressed.

Food deprivation stimulates cell proliferation in the gastric epithelium of suckling, but not weanling rats. This study was designed to investigate the role of diet on proliferation in developing animals, using early weaning and prolonged nursing models. Rat pups were subjected to these dietary conditions at d 15 and were killed 3 or 7 d afterwards. One day before killing, half of pups were deprived of food. Body weights were recorded. After mitosis blockade, the histologic sections of the stomach were used for the evaluation of cell proliferation and methapasic cell distribution along the gland, and for the measurement of mucosa thickness. Body weight was impaired at 18 d by early weaning and at 22 d by prolonged nursing. Food restriction promoted a 10–15% weight loss regardless of dietary conditions. At 18 d, food deprivation inhibited cell division (P < 0.01) and reduced the thickness of the mucosa (P < 0.05) in rats that were weaned early. At 22 d, only the thickness of the mucosa was different between the groups that were subjected to early weaning and prolonged nursing (P < 0.05), regardless of feeding state. The frequency of dividing cells along the gland was affected by early weaning in 18- and 22-d-old rats. These results suggest the following: 1) food deprivation effects are dependent on dietary condition at 18 d because different proliferative responses were achieved after early weaning and prolonged nursing; 2) the lack of changes after dietary manipulation in 22-d-old rats indicates a nonresponsive period during postnatal development. We conclude that milk is a modulatory factor for cell proliferation in the gastric mucosa of rats.

KEY WORDS: • rats • weaning • gastric epithelium • cell proliferation • gastric growth

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