{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T23:11:28Z","timestamp":1790377888019,"version":"4.1.0"},"reference-count":60,"publisher":"The Endocrine Society","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2006,4,1]]},"abstract":"<jats:p>Context: Patients with polycystic ovarian syndrome (PCOS) have increased LH relative to FSH, but LH is modified by body mass index (BMI).<\/jats:p>\n               <jats:p>Objective: The objective of the study was to determine whether the impact of BMI on neuroendocrine dysregulation in PCOS is mediated at the hypothalamic or pituitary level.<\/jats:p>\n               <jats:p>Participants\/Interventions\/Setting: Twenty-four women with PCOS across a spectrum of BMIs underwent frequent blood sampling, iv administration of GnRH (75 ng\/kg), and sc administration of the NAL-GLU GnRH antagonist (5 \u03bcg\/kg) in the General Clinical Research Center at an academic hospital.<\/jats:p>\n               <jats:p>Main Outcome Measures: LH pulse frequency and LH response to submaximal GnRH receptor blockade were used as measures of hypothalamic function; LH response to GnRH was used as a measure of pituitary responsiveness.<\/jats:p>\n               <jats:p>Results: BMI was negatively correlated with mean LH, LH\/FSH, and LH pulse amplitude. There was no effect of BMI on LH pulse frequency. Percent inhibition of LH was decreased in PCOS, compared with normal women (53.9 \u00b1 1.5 vs. 63.1 \u00b1 4.1, respectively; P &amp;lt; 0.01), suggesting an increase in the amount of endogenous GnRH, but was not influenced by BMI. Pituitary responsiveness to GnRH was inversely correlated with BMI (peak LH, R = \u22120.475, P &amp;lt; 0.02; and LH area under the curve R = \u22120.412, P &amp;lt; 0.02).<\/jats:p>\n               <jats:p>Conclusions: LH pulse frequency and quantity of GnRH are increased in PCOS, but there is no influence of BMI on either marker of hypothalamic function. The pituitary response to a weight-based dose of GnRH is inversely related to BMI in PCOS. These studies suggest that the effect of BMI on LH is mediated at a pituitary and not a hypothalamic level in PCOS.<\/jats:p>","DOI":"10.1210\/jc.2005-2099","type":"journal-article","created":{"date-parts":[[2006,1,25]],"date-time":"2006-01-25T02:52:53Z","timestamp":1138157573000},"page":"1309-1316","source":"Crossref","is-referenced-by-count":106,"title":["Inverse Relationship between Luteinizing Hormone and Body Mass Index in Polycystic Ovarian Syndrome: Investigation of Hypothalamic and Pituitary Contributions"],"prefix":"10.1210","volume":"91","author":[{"given":"Yanira L.","family":"Paga\u0301n","sequence":"first","affiliation":[{"name":"Reproductive Endocrine Unit (Y.L.P., S.S.S., Y.J., A.E., S.G., J.E.H.), Massachusetts General Hospital, Boston, Massachusetts 02114"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Serene S.","family":"Srouji","sequence":"additional","affiliation":[{"name":"Reproductive Endocrine Unit (Y.L.P., S.S.S., Y.J., A.E., S.G., J.E.H.), Massachusetts General Hospital, Boston, Massachusetts 02114"},{"name":"Department of Obstetrics and Gynecology (S.S.S.), Center for Reproductive Medicine, Brigham and Women\u2019s Hospital, Boston, Massachusetts 02115"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yarisie","family":"Jimenez","sequence":"additional","affiliation":[{"name":"Reproductive Endocrine Unit (Y.L.P., S.S.S., Y.J., A.E., S.G., J.E.H.), Massachusetts General Hospital, Boston, Massachusetts 02114"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anne","family":"Emerson","sequence":"additional","affiliation":[{"name":"Reproductive Endocrine Unit (Y.L.P., S.S.S., Y.J., A.E., S.G., J.E.H.), Massachusetts General Hospital, Boston, Massachusetts 02114"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sabrina","family":"Gill","sequence":"additional","affiliation":[{"name":"Reproductive Endocrine Unit (Y.L.P., S.S.S., Y.J., A.E., S.G., J.E.H.), Massachusetts General 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