Alcohol alters luteinizing hormone secretion in immature female rhesus monkeys by a hypothalamic action

Gregory A. Dissen, Robert K. Dearth, H. Morgan Scott, Sergio R. Ojeda, W. Les Dees

    Research output: Contribution to journalArticle

    21 Scopus citations

    Abstract

    We determined whether the effect of alcohol (ALC) to suppress LH secretion in immature female monkeys is due to a hypothalamic or pituitary site of action. Beginning at 20 months of age, four monkeys received a single intragastric dose of ALC (2.4 g/kg), and four monkeys received an equal volume of a saline/sucrose solution daily until they were 36 months old. For the hypothalamic response test, two basal samples (3.5 ml) were collected at 15-min intervals via the saphenous vein, and then N-methyl-D-L-aspartic acid (NMA; 20 mg/kg) was given iv and four more blood samples collected. Three weeks later, this protocol was repeated except LH-releasing hormone (LHRH) (5 μg/kg) was used to test pituitary responsiveness. NMA or LHRH was administered 3 h after the ALC. After the pituitary challenge, each monkey was ovariectomized and 6 wk later, implanted with an indwelling subclavian vein catheter. Blood samples were drawn every 10 min for 8 h to assess effects of ALC on post-ovariectomy LH levels and the profile of LH pulsatile secretion. The hypothalamic challenge showed NMA stimulated LH release in control monkeys, an action that was blocked by ALC. The pituitary challenge revealed that LHRH stimulated LH release equally well in control and ALC-treated monkeys. A post-ovariectomy rise in LH was observed in both groups, but levels were 45% lower in ALC-treated monkeys. This reduction was attributed to an ALC-induced suppression of both baseline and amplitude of pulses. Results demonstrate that the ALC-induced suppression of LH in immature female rhesus monkeys is due to an inhibitory action of the drug at the hypothalamic level.

    Original languageEnglish (US)
    Pages (from-to)4558-4564
    Number of pages7
    JournalEndocrinology
    Volume145
    Issue number10
    DOIs
    StatePublished - Oct 2004

    ASJC Scopus subject areas

    • Endocrinology

    Fingerprint Dive into the research topics of 'Alcohol alters luteinizing hormone secretion in immature female rhesus monkeys by a hypothalamic action'. Together they form a unique fingerprint.

  • Cite this

    Dissen, G. A., Dearth, R. K., Scott, H. M., Ojeda, S. R., & Dees, W. L. (2004). Alcohol alters luteinizing hormone secretion in immature female rhesus monkeys by a hypothalamic action. Endocrinology, 145(10), 4558-4564. https://doi.org/10.1210/en.2004-0517