Abstract
A sensitive and specific radioimmunoassay for LH-releasing hormone (LHRH) was developed. Using a specific antibody we have attempted to define or dissociate a separate FSHRH, antigenically distinct from LHRH. In an in vitro system, LH release by hypothalamic extract was inhibited by a certain dose of LHRH antiserum but FSH release was not affected. Diurnal patterns of LHRH, FSH and prolactin were studied but no clear cyclic changes were shown. LHRH and LH levels in the serum were completely dissociated. We suggest that negative feedback systems play a more critical role than hypothalamic LHRH in the release of LH.
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