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In both men and women, l-dopa pre-treatment significantly suppressed the prolactin rise which followed iv thyrotropin-releasing hormone (TRH). Although this phenomenon is compatible with more than one site of action for both dopamine and TRH within the hypothalamicpituitary system, it is suggested that one action of dopamine in humans may be to inhibit prolactin secretion directly at the level of the anterior pituitary.
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NOEL et al. (1973) studied this question.
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