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Am J Physiol Regul Integr Comp Physiol 278: R663-R668, 2000;
0363-6119/00 $5.00
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Vol. 278, Issue 3, R663-R668, March 2000

Neonatal hypoxic hyperlipidemia in the rat: effects on aldosterone and corticosterone synthesis in vitro

Hershel Raff1,2, Eric D. Bruder1, Barbara M. Jankowski1, and Theodore L. Goodfriend3

1 Endocrine Research Laboratory, St. Luke's Medical Center, Milwaukee 53215; 2 Department of Medicine, Medical College of Wisconsin, Milwaukee 53226; and 3 Wm. S. Middleton Memorial Veterans Hospital and the Departments of Medicine and Pharmacology, University of Wisconsin School of Medicine, Madison, Wisconsin 53705

Neonatal hypoxia increases aldosterone production and plasma lipids. Because fatty acids can inhibit aldosterone synthesis, we hypothesized that increases in plasma lipids restrain aldosteronogenesis in the hypoxic neonate. We exposed rats to 7 days of hypoxia from birth to 7 days of age (suckling) or from 28 to 35 days of age (weaned at day 21). Plasma was analyzed for lipid content, and steroidogenesis was studied in dispersed whole adrenal glands untreated and treated to wash away lipids. Hypoxia increased plasma cholesterol, triglycerides, and nonesterified fatty acids in the suckling neonatal rat only. Washing away lipids increased aldosterone production in cells from 7-day-old rats exposed to hypoxia, but not in cells from normoxic 7-day-old rats or from normoxic or hypoxic 35-day-old rats. Addition of oleic or linolenic acid to washed cells inhibited both aldosterone and corticosterone production, although cells from hypoxic 7-day-old rats were less sensitive. We conclude that hypoxia induces hyperlipidemia in the suckling neonate and that elevated nonesterified fatty acids inhibit aldosteronogenesis.

adrenal cortex; steroidogenesis; fatty acids; cholesterol; triglycerides


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