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- W2003970895 abstract "Two experiments were conducted in ovariectomized, pituitary stalk-transected ewes to determine if dopamine (DA), norepinephrine (NE) or serotonin (5-HT) alter secretion of luteinizing hormone (LH), follicle-stimulating hormone (FSH) and prolactin (PRL). In experiment 1, ewes were infused (iv) with saline (control), DA (66 micrograms/kg/min), NE (6.6 micrograms/kg/min) or 5-HT (6.6 micrograms/kg/min). Treatments did not alter pulse frequency, but 5-HT increased (P less than .05) amplitude of pulses of LH and mean concentrations of LH, DA and NE were without effect on basal secretion of LH. DA but not NE or 5-HT decreased (P less than .05) the release of LH in response to gonadotropin hormone-releasing hormone (GnRH, 25 micrograms, im). Concentrations of FSH were not affected by treatments. Secretion of PRL was reduced (P less than .05) by treatment with DA and NE but not 5-HT. Each amine reduced (P less than .05) the release of PRL in response to thyrotropin-releasing hormone (TRH; 3 micrograms, im). In experiment 2, ewes were given DA at doses of 0, 0.66, 6.6 or 66.0 micrograms/kg/min, iv. No dose altered basal LH, but each dose reduced (P less than .05) basal and TRH-induced release of PRL. Key findings from these studies include direct pituitary action for: (1) 5-HT enhanced basal secretion of LH, (2) suppression of GnRH-induced secretion of LH by DA. (3) DA and NE inhibition of PRL secretion, and (4) DA, NE and 5-HT inhibition of release of PRL in response to TRH." @default.
- W2003970895 created "2016-06-24" @default.
- W2003970895 creator A5039865233 @default.
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- W2003970895 date "1991-01-01" @default.
- W2003970895 modified "2023-09-27" @default.
- W2003970895 title "Effects of dopamine, norepinephrine and serotonin on secretion of luteinizing hormone, follicle-stimulating hormone and prolactin in ovariectomized, pituitary stalk-transected ewes" @default.
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- W2003970895 doi "https://doi.org/10.1016/0739-7240(91)90043-j" @default.
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