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ORIGINAL RESEARCH ARTICLE

Effects of Hypoxia on the Development of Intestinal Enzymes in Neonatal and Juvenile Rats

Ping C. Lee^*,,1, Mark Struve^* and Hershel Raff^,

^* Departments of Pediatrics,
Pharmacology and Toxicology, and
Medicine, Medical College of Wisconsin, Milwaukee, Wisconsin 53226; and
Endocrine Research Laboratory, St. Luke’s Medical Center, Milwaukee, Wisconsin 53215

Hypoxia in the neonate is known to alter the activity of hepatic and pancreatic enzymes involved in lipid and carbohydrate metabolism. The purpose of this study was to evaluate the effect of neonatal hypoxia on the activity of intestinal enzymes, and to determine whether the administration of glucocorticoids to neonates can mimic the effects of hypoxia. Hypoxia in neonatal rats (0–7 days) increased protein content, and lactase and maltase activity in the duodenal and the jejunal segments of the small intestine compared with normoxic controls. Hypoxia in juvenile rats (28–35 days) did not change these enzymes. Two weeks after returning hypoxic (0–7 days) pups to normoxia, their body weight remained lower than the age-matched controls. In the group recovering from hypoxia, sucrase, maltase, and leucine aminopeptidase activities were lower in the duodenal and the jejunal segment. Compared with controls, LDH activity was lower only in the jejunal intestine in the group recovering from hypoxia. All enzyme activities returned to control levels 3 weeks after recovery. Neonatal rats treated with dexamethasone had a decrease in body weight, but increases in sucrase and maltase activity in both the duodenal and the jejunal segment. Hypoxia in newborn rats caused a delayed maturation of small intestinal enzymes. Increases in serum glucocorticoids after hypoxic exposure probably do not play a major role in the delayed maturation of the disaccharidase activity in the small intestine.

Key Words: hypoxia • intestinal enzymes • development

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