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Permanent abnormal response to a glucose load after prenatal ethanol exposure in rats
D López-Tejero1, M Llobera, E Herrera
1Departamento de Bioquímica i Fisiología, Facultat de Biología, Universitat de Barcelona, Spain.
Insights
Prenatal ethanol exposure in rats caused low blood sugar at birth and high insulin levels throughout development. Adult offspring showed normal blood sugar but elevated insulin after a glucose challenge, indicating lasting metabolic changes.
Area of Science:
- Endocrinology
- Developmental Biology
- Toxicology
Background:
- Prenatal exposure to ethanol can disrupt normal physiological development.
- Understanding the long-term effects of ethanol on glucose and insulin homeostasis is crucial.
Purpose of the Study:
- To investigate the postnatal development of glucose and insulin balance in offspring exposed to ethanol in utero.
- To assess the long-term metabolic consequences of prenatal ethanol exposure.
Main Methods:
- Rats exposed to ethanol prenatally were compared to control offspring.
- Offspring were cross-fostered to non-ethanol-treated dams for postnatal development.
- Glucose tolerance tests were performed at weaning (30 days) and adult age (90 days).
Main Results:
- Prenatal ethanol exposure resulted in neonatal hypoglycemia and persistent hyperinsulinemia.
- Weaned offspring exhibited exaggerated glucose and insulin responses to glucose challenge.
- Adult offspring showed normal glucose response but a significantly higher insulin response to oral glucose load.
Conclusions:
- Prenatal ethanol exposure induces lasting alterations in glucose and insulin regulation.
- The persistent hyperinsulinemia suggests potential pancreatic dysfunction or insulin resistance.
- These findings highlight the critical impact of in utero ethanol exposure on metabolic programming.
Abstract:
Postnatal development of the glucose and insulin balance in offspring of ethanol-treated and control rats has been studied. Newborn rats were separated from their mothers and placed with normal lactating, nonethanol-treated dams. Prenatal exposure to ethanol led to hypoglycemia on the first day of extrauterine life and a general tendency to hyperinsulinemia during the entire postnatal period studied. The glucose-tolerance test in weaned rats (30 days old) gave a greater and faster increase than controls in levels of both glucose and plasma insulin. At adult age (90 days) the response of blood glucose to an oral glucose load in offspring from ethanol-treated mothers was not different from that in offspring from controls, but the insulin response was higher. This abnormal insulin response, such a long time after the end of ethanol exposure, suggests either a permanent alteration in the pancreatic response, or a peripheral insulin resistance and/or differences in the rate of insulin degradation in these animals.