Role of maternal nutrition in programming adiposity in the offspring: potential implications of glucocorticoids.

The epidemiological studies initially indicated that maternal undernutrition leading to a low birth weight may predispose to the long-lasting energy balance disorders. A high birth weight due to maternal obesity or diabetes, inappropriate early postnatal nutrition, and rapid catch-up growth, may also sensitize to an increased risk of obesity. As stated by the developmental origin of health and disease concept, the perinatal perturbation of the fetus/neonate nutrient supply might be a crucial determinant of the individual programming of the body weight set point. The adipose tissue is considered as the main fuel storage unit involved in the maintenance of the energy homeostasis. Several models have demonstrated that this tissue is a prime target of the developmental programming in a gender- and depot-specific manner. In the rodents, the perinatal period of life corresponds largely to the period of adipogenesis. In contrast, this phenomenon essentially takes place before birth in bigger mammals. Despite these different developmental time windows, the altricial and precocial species share several common offspring programming mechanisms. Thus, the adipose tissue of the offspring from malnourished dams exhibited impaired glucose uptake and leptin/insulin resistance with increased proinflammatory markers. It also displayed a modified sympathetic activity, circadian rhythm, fatty acid composition, and thermogenesis. This might lead to the reprogrammed metabolism and distribution of the adipose tissue with enhanced adipogenesis and fat accumulation predisposing to adiposity. The inappropriate glucocorticoid (GC) levels and modified tissue sensitivity might be key actors of perinatal programming and long-lasting altered adipose tissue activity in the offspring. Following maternal malnutrition, the epigenetic mechanisms might also be responsible for the adipose tissue programming.