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: To determine if calcium had a goitrogenic effect on the thyroid function in rats, weanling rats were fed, for three weeks, a diet containing either 0.5 microgram or 0.04 microgram iodine per gram of diet, or an adequate (0.47%) or an excessive (2%) amount of calcium. With an adequate iodine diet, the calcium load did not induce an increase in the weight of the thyroid or a decrease in serum thyroid hormone concentration. However, the rats given a calcium load had a lighter body weight and a lower iodine content in the thyroid tissue; they also had a higher thyroxine (T4) content in the liver and kidney tissues than the rats receiving an adequate calcium diet. With a low iodine diet, the calcium load brought out a decrease in growth and a lower serum triiodothyronine (T3) concentration and liver and kidney T3 contents. These changes suggest that the calcium load might have acted on the thyroid function through an inhibition of T4-T3 conversion in the serum as well as in liver and kidney tissues.

Effets de l'apport alimentaire en calcium sur la fonction thyroïdienne chez le rat