Abstract
The influence of neonatal thyroidectomy (Tx) on developmental changes in dopamine (DA), acetylcholine (ACh), and acetylcholinesterase (AChE) was studied in the whole brain of rats. In control animals, brain levels of ACh gradually increased and attained adult values at the 70th day. In contrast, AChE activity showed a rapid increase between the 7th and 30th days. Levels of DA were low during the early postnatal life but markedly increased to reach adult values of 1.47 mug/g at the 30th day, after which no further enhancement was noted. Neonatal Tx interfered with the normal growth of the animals, decreased brain weights, and markedly influenced the developmental pattern of both DA and ACh in the brain. The concentration of DA in 30-day-old hypothyroid rats was 46% of the control values. In contrast, brain ACh levels in Tx rats were consistently above those seen in controls, being significantly higher, by 49 and 64%, at 15 and 30 days, respectively. Activity of AChE in brains of hypothyroid animals was not significantly different from that in controls. Treatment of Tx rats with thyroid hormone virtually restored the levels of DA and ACh to values in control animals.
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