The effect of low-dose dopamine infusion on anterior pituitary hormone secretion in normal female subjects.
The effect of low-dose dopamine infusion on anterior pituitary hormone secretion in a group of seven healthy female subjects is reported. Subjects were infused with NaCl solution (154 mmol/l) (control) or dopamine (0.01 and 0.1 micrograms min-1 kg-1 for 120 min at each rate) on separate days in the early follicular phase of consecutive menstrual cycles. Serum prolactin decreased during infusion of dopamine at 0.01 micrograms min-1 kg-1 but a similar fall was found in the control group. When the rate of dopamine infusion was increased to 0.1 micrograms min-1 kg-1 a further substantial decrease in prolactin concentration occurred, whereas prolactin in the control group showed no change. At the end of the period of dopamine infusion at 0.1 micrograms min-1 kg-1 serum prolactin remained significantly (P less than 0.025) lower than in the control group (85 +/- 12 vs 180 +/- 21 m-units/1). No change in thyrotrophin (TSH), growth hormone (GH) or luteinizing hormone (LH) was seen during either rate of dopamine infusion compared with control. While dopamine infusion at 0.1 micrograms min-1 kg-1 caused significant inhibition of prolactin secretion in normal female subjects, other pituitary hormone secretion was not affected: it is suggested that under the conditions of this study dopamine in hypophysial portal blood is not of primary importance in the control of basal TSH, GH and LH release.
D000328:Adult; D004298:Dopamine / Q000494:pharmacology*; D005260:Female; D013006:Growth Hormone / Q000097:blood / Q000378:metabolism; D006801:Humans; D007986:Luteinizing Hormone / Q000097:blood / Q000378:metabolism; D010908:Pituitary Hormones, Anterior / Q000097:blood / Q000378:metabolism*; D011388:Prolactin / Q000097:blood / Q000378:metabolism; D012636:Secretory Rate / Q000187:drug effects; D013972:Thyrotropin / Q000097:blood / Q000378:metabolism
D010908:Pituitary Hormones, Anterior; D011388:Prolactin; D007986:Luteinizing Hormone; D013972:Thyrotropin; D013006:Growth Hormone; D004298:Dopamine