2008•NeuroendocrinologyRequires access

Measurement of Plasma and Hypothalamic Luteinizing Hormone-Releasing Hormone in Pregnant Mare Serum-Induced Ovulating Immature Rats

Sandy Sorrentino, David K. Sundberg

Abstract

A radioimmunoassay for luteinizing hormone-releasing hormone (LH-RH) is described which is capable of detecting LH-RH in plasma and brain tissues. Fluctuations in plasma and hypothalamic LH-RH as well as plasma LH were measured in immature female rats in which ovulation was induced by a single injection of pregnant mare serum (PMS). High plasma levels of LH-RH were found 47-49 h after the initial injection of PMS, coincident with high plasma LH concentrations. However plasma LH-RH levels were considerably lower at 55-57 h post-PMS, when plasma LH levels were elevated. Hypothalamic LH-RH content could not be correlated with either plasma LH-RH or LH levels.

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Key concepts: Endocrinology, Internal medicine, Luteinizing hormone, Radioimmunoassay, Ovulation, Hypothalamus, Hormone, Chemistry