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Thyroid hormone levels in rats exposed to alcohol during development.
M Portolés1, R Sanchis, C Guerri
1Instituto de Investigaciones Citológicas de la Caja de Ahorros de Valencia, Spain.
Hormone and Metabolic Research = Hormon- Und Stoffwechselforschung = Hormones Et Metabolisme
|May 1, 1988
Summary
Maternal alcohol consumption impacts offspring growth and thyroid hormones. Alcohol exposure, especially postnatally, significantly disrupts thyroid function, affecting thyroxine (T4) and triiodothyronine (T3) levels in developing rats.
Area of Science:
- Endocrinology
- Developmental Biology
- Toxicology
Background:
- Maternal alcohol ingestion is linked to congenital anomalies and growth deficits in offspring.
- The role of thyroid hormones in alcohol-induced developmental toxicity requires further investigation.
Purpose of the Study:
- To investigate the impact of prenatal and/or postnatal alcohol exposure on thyroid hormone levels (T4 and T3) in developing rats.
- To determine if alcohol exposure affects the hypothalamo-pituitary-thyroid axis during critical developmental periods.
Main Methods:
- Pregnant rats were fed alcohol to achieve blood levels of 20-25 mM.
- Serum T4 and T3 levels were measured in dams during gestation and in offspring from birth to 50 days.
- Offspring were exposed to alcohol prenatally, postnatally, or both.
Main Results:
- Prenatal alcohol exposure decreased maternal T4 levels during gestation and offspring T4 and T3 levels at birth.
- Postnatal alcohol exposure caused more significant decreases in both T4 and T3 levels, with a transient T4 increase observed around days 20-25.
- Thyroid hormone levels were most affected by alcohol exposure during the postnatal period.
Conclusions:
- Alcohol exposure disrupts the hypothalamo-pituitary-thyroid axis in rats.
- Postnatal alcohol exposure has a more pronounced effect on thyroid hormone levels than prenatal exposure.
- Thyroid function is a sensitive indicator of alcohol's developmental toxicity.