The specific activities of testicular enzymes of the pyruvate/malate cycle involved in lipogenesis after thyroidectomy and thyroxine replacement were studied in prepubertal, pubertal and adult rats. Thyroidectomy induced testicular ATP citrate-lyase, malate dehydrogenase and malic enzyme activities and inhibited isocitrate dehydrogenase (NADP+) activity. Thyroxine treatment on thyroidectomized animals reverted all enzyme activities to normal. The result suggests that thyroid hormones have a differential effect on testicular enzymes of the pyruvate/malate cycle involved in lipogenesis.
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粕谷 et al. (2011) studied this question.
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