Abstract
The dose response and time course effects of L-tryptophan and restraint stress on the metabolism of serotonin and release of thyroid stimulating hormone (TSH) and prolactin (PRL) were tested in male rats. Both treatments increased serotonin turnover in the hypothalamus (H) and remaining brain tissue minus the cerebellum (brain) as determined by enhanced accumulation of serotonin following monoamine oxidase (MAO) inhibition. L-tryptophan but not restraint stress elevated levels of tryptophan in the cerebellum. Both L-tryptophan and restraint stress inhibited TSH release and stimulated PRL release. These findings indicate that enhanced rates of serotonin turnover produced by L-tryptophan and physical restraint are associated with inhibition of TSH and stimulation of PRL release from the anterior pituitary.
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