Activity of Tyrosine Trans aminase in the Thyroid Gland

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Abstract
The catabolic enzyme, tyrosine α-ketoglutarate transaminase, has been found in small amounts in the thyroid gland of rats. The activity, expressed as micromoles of p-hydroxyphenylpyruvic acid formed from tyrosine per gram of tissue fresh weight, was 2.9 units in the glands of healthy rats. This content was 2–6 % of that found per gram of liver. The thyroid glands of thyroxine-treated animals had an activity of enzyme similar to that of the untreated controls. These preliminary findings suggest that the rate of degradation of tyrosine by the thyroid is relatively stable; this stands in contrast with the fluctuations often observed in liver.