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As enhanced adipogenesis contributes to programmed obesity, adipogenic and lipogenic signaling pathways in intrauterine growth restricted (IUGR) offspring were examined. From 10 days to term gestation, rats received ad libitum food (control) or were 50% food-restricted (IUGR). Pups were nursed and weaned to ad libitum diet. mRNA and protein levels of adipogenic transcription factors and lipid enzymes (1 day and 9 month) and adipocyte cell size (3 weeks and 9 months) were determined. One day-old IUGR males showed upregulation of peroxisome proliferator-activated receptor (PPAR gamma(2)), including upstream factors regulating PPAR gamma, and RXR alpha, with which PPAR gamma heterodimerizes. Intracellular lipolytic enzyme (hormone-sensitive lipase) was downregulated. Nine-month-old IUGR males showed upregulation of adipogenic and lipogenic (SREBP1c) transcription factors with upregulation of enzymes facilitating fatty acid uptake (lipoprotein lipase) and synthesis (fatty acid synthase), leading to hypertrophic adipocytes. Paradoxical upregulation of adipogenesis signaling cascade prior to the development of obesity in IUGR males suggests early changes in signaling mechanisms.

Programmed Upregulation of Adipogenic Transcription Factors in Intrauterine Growth-Restricted Offspring