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Fetal growth is regulated by a complex interaction of maternal, placental, and fetal factors. The effects and outcomes that chemicals, widely distributed in the environment, may have on the health status of both the mother and the fetus are not yet well defined. Mainly mixtures of chemical substances are found in the mothers and placenta. Exposure to endocrine-disrupting chemicals (EDCs) can be associated with fetal growth retardation, thyroid dysfunction, and neurological disorders. EDCs mostly interfere with insulin, glucocorticoid, estrogenic, and thyroid pathways, with subsequent effects on normal endocrine and metabolic functions, which cause changes in the epigenome and state of inflammation with life-long effects and consequences. International scientific societies recommend the implementation of research and of all possible preventive measures. This review briefly summarizes all these aspects.

SUMMARY 1. Epidemiological evidence indicates that low birthweight increases the risk of a number of adult-onset diseases. It is now apparent that many babies with a low birthweight may have been subjected to a combination of reduced growth rates in utero as well as preterm birth. However, the long-term effects of preterm birth following intra-uterine growth restriction (IUGR) are unknown. Thus, our objectives were: (i) to identify prenatal factors associated with preterm birth in IUGR fetuses; and (ii) to characterize postnatal effects of preterm birth following IUGR. 2. We studied pregnant sheep and their offspring, in which fetal growth was restricted by umbilico-placental embolization during late gestation. Some of these animals were born at term (146±1 days) and some were born prematurely (139±1 days). In both groups, we have conducted longitudinal studies of postnatal respiratory function, cardiovascular function and learning ability up to 6-8 weeks of age. 3. Before birth, IUGR fetuses born prematurely (P-IUGR) were more hypoxaemic and acidaemic and had higher haemoglobin concentrations than both control fetuses and IUGR fetuses born at term (T-IUGR). In P-IUGR fetuses, plasma cortisol concentrations increased earlier than in the two other groups. The P-IUGR lambs had lower birthweights than T-IUGR lambs and both groups of IUGR lambs remained lighter than controls for 8 weeks. 4. After birth, P-IUGR lambs were hypoxaemic compared with T-IUGR and control lambs. Pulmonary diffusing capacity (adjusted for lung volume) was significantly lower in both groups of IUGR lambs than in controls, with P-IUGR lambs having lower values than T-IUGR lambs. Lung compliance (adjusted for lung volume), was not different between P-IUGR and control lambs, but values were higher in T-IUGR lambs than in control and P-IUGR lambs. Chest wall compliance (adjusted for lung volume) was higher in both groups of IUGR lambs than in controls. 5. During the 8 week postnatal... [ABSTRACT FROM AUTHOR]

Fetal growth is regulated by a complex interaction of maternal, placental, and fetal factors. The effects and outcomes that chemicals, widely distributed in the environment, may have on the health status of both the mother and the fetus are not yet well defined. Mainly mixtures of chemical substances are found in the mothers and placenta. Exposure to endocrine-disrupting chemicals (EDCs) can be associated with fetal growth retardation, thyroid dysfunction, and neurological disorders. EDCs mostly interfere with insulin, glucocorticoid, estrogenic, and thyroid pathways, with subsequent effects on normal endocrine and metabolic functions, which cause changes in the epigenome and state of inflammation with life-long effects and consequences. International scientific societies recommend the implementation of research and of all possible preventive measures. This review briefly summarizes all these aspects. [ABSTRACT FROM AUTHOR]