A delayed LH/FSH rise after gonadectomy and a delayed serum TSH rise after thyroidectomy in monosodium-l-glutamate (MSG)-treated rats

George H. Greeley, Gayle F. Nicholson, J. S. Kizer

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    Abstract

    The serum LH and FSH rise after gonadectomy and the serum TSH rise after thyroidectomy were examined in rats that received monosodium-l-glutamate (MSG) as neonates. The rise in serum gonadotrophins after gonadectomy was significantly delayed in both adult and peripubertal MSG-treated rats when compared to control castrates. Serum LH and FSH levels, however, eventually achieved levels in MSG-treated rats that were not significantly different than those of controls. The serum TSH rise after thyroidectomy was significantly delayed in adult female MSG-treated rats, but not in prepubertal female MSG-treated rats. Pituitary responsiveness to both exogenous LH-RH and TRH was unaffected by neonatal MSG treatment, with one exception: pituitary responsiveness to LH-RH of orchidectomized peripubertal males was blunted significantly. The results are discussed in terms of the possible neurotoxic effects of neonatal MSG treatment, as well as the altered hypothalamic sensitivity to gonadal steroids.

    Original languageEnglish (US)
    Pages (from-to)111-122
    Number of pages12
    JournalBrain Research
    Volume195
    Issue number1
    DOIs
    StatePublished - Aug 11 1980

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    Keywords

    • FSH
    • LH
    • TSH
    • arcuate nucleus
    • gonadectomy
    • hypothalamus
    • monosodium-l-glutamate
    • thyroidectomy

    ASJC Scopus subject areas

    • Neuroscience(all)
    • Molecular Biology
    • Clinical Neurology
    • Developmental Biology

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