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Estrogens as modulators of dopamine activity in the regulation of the gonadotropic function of the pituitary gland

Adamskaia, E.I.; Babichev, V.N.

Problemy Endokrinologii 27(5): 49-53

1981

ISSN/ISBN: 0375-9660
PMID: 7197360
Document Number: 179220
The effect of dopamine (DA), injected into arcuate nucleus-medial eminence (ARC-ME) region, on luteinizing hormone (LH) secretion, was studied in intact female rats, depending on the estrual cycle stage and in ovariectomized )OE) rats previously treated with estradiol benzoate (OE + E) or untreated animals. The increased blood LH concentration was recorded 30 minutes after dopamine injection during the second half of the 2-diestrus day and in the morning of the proestrus stage. DA injection into ARC-ME to OE rats lowered the blood and hypophyseal LH levels, whereas the increased blood Lh concentration was seen in OE + E rats. From the data obtained it was concluded that the hypothalamic dopaminergic system participates in the ovulatory LH-release regulation, while DA effect on gonadotropic function is determined by the peripheral blood estrogen level.

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