Abstract

Age-related changes of content of thyroid hormones in the blood serum and of activities of lysosomal proteinases in organs were studied in the arctic fox Alopex lagopus L. in early postnatal ontogenesis. The existence has been shown of a negative correlation between the age changes in the serum thyroxin content and lysosomal proteinase activities in some organs of these animals. The results obtained indicate predominance of anabolic function of thyroid hormones in arctic fox cubs. The problem of anabolic and catabolic effects of thyroid hormones on protein metabolism is discussed.

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