{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T01:17:45Z","timestamp":1792113465201,"version":"4.4.0"},"reference-count":0,"publisher":"S. Karger AG","license":[{"start":{"date-parts":[[2008,3,28]],"date-time":"2008-03-28T00:00:00Z","timestamp":1206662400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"},{"start":{"date-parts":[[2008,3,28]],"date-time":"2008-03-28T00:00:00Z","timestamp":1206662400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/karger.com\/pages\/terms-and-conditions"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Neuroendocrinology"],"abstract":"<jats:p>A sensitive in vitro bioassay for measuring serum follicle-stimulating hormone (FSH) levels has been developed based on the stimulation of estrogen production by cultured rat granulosa cells. In the presence of androstenedione, FSH stimulated estrogen production in a dose-dependent manner. Cell sensitivity to FSH was further enhanced by the addition of diethylstilbestrol, a phosphodiesterase inhibitor, insulin, and human chorionic gonadotropin. Although the inclusion of 4% gonadotropin-free serum from hypophysectomized rats inhibited granulosa cell responsiveness, pretreatment of serum with polyethylene glycol (12%) substantially eliminated the serum interfering effect without loss of FSH activity. In normal male and female rats, serum bioactive FSH levels were low, while castration increased these levels 2.6-and 5.7-fold, respectively. These increases were suppressed by treatment with testosterone propionate or estradiol benzoate. This in vitro assay allows the measurement of circulating bioactive FSH and provides a convenient tool to advance studies on the role of FSH in the neuroendocrine control of gonadal maturation and reproductive cycles.<\/jats:p>","DOI":"10.1159\/000124216","type":"journal-article","created":{"date-parts":[[2008,3,28]],"date-time":"2008-03-28T16:47:51Z","timestamp":1206722871000},"page":"445-448","source":"Crossref","is-referenced-by-count":43,"title":["Sensitive in vitro Bioassay for the Measurement of Serum Follicle-Stimulating Hormone"],"prefix":"10.1159","author":[{"given":"Xiao-Chi","family":"Jia","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aaron J.W.","family":"Hsueh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"127","published-online":{"date-parts":[[2008,3,28]]},"container-title":["Neuroendocrinology"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.karger.com\/Article\/Pdf\/124216","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/karger.com\/article-pdf\/doi\/10.1159\/000124216","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T19:09:24Z","timestamp":1777662564000},"score":1,"resource":{"primary":{"URL":"https:\/\/karger.com\/article\/doi\/10.1159\/000124216"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2008,3,28]]},"references-count":0,"URL":"https:\/\/doi.org\/10.1159\/000124216","archive":["Portico"],"relation":{},"ISSN":["0028-3835","1423-0194"],"issn-type":[{"value":"0028-3835","type":"print"},{"value":"1423-0194","type":"electronic"}],"subject":[],"published":{"date-parts":[[2008,3,28]]}}}