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• W2013282836 abstract "The endocrine feedback role of dimeric inhibin on FSH secretion from the pituitary has been well established in many species; however, evidence that inhibin is an important endocrine regulator of FSH in the human is more tenuous. One potential explanation for the equivocal data may be that the inhibin immunoassay used most widely in the human is a heterologous assay with an antiserum that exclusively recognizes the inhibin alpha-subunit in both its monomeric form and in inhibin dimers. The aim of the present study was to quantify serum inhibin levels in a variety of fertile and infertile men and women using a new ultrasensitive enzyme-linked immunosorbent assay that is specific for the dimeric form (alpha/beta) only. The specificity of the present assay was demonstrated by the absence of significant cross-reactivity with Mullerian inhibiting substance, transforming growth factor-beta, activin, FSH, LH, hCG, TSH, and hCG alpha and with the alpha-subunit of inhibin. The assay was sensitive to 1 pg/mL, and serial dilutions of human male and female serum samples paralleled the recombinant 32-kilodalton (kDa) dimeric inhibin standard curve. Complete recovery of exogenous recombinant 32-kDa inhibin added to serum was obtained. Mean serum inhibin levels ranged from a low of 5.7 +/- 0.6 pg/mL in the early follicular phase to 49.0 +/- 11.2 pg/mL in the midluteal phase of the normal menstral cycle and were elevated during ovulation induction (1250 pg/mL) and pregnancy (500 pg/mL). Interestingly, mean levels of dimeric inhibin in women with polycystic ovarian syndrome (PCOS) were indistinguishable from normal follicular phase. The most striking observation was the extremely low mean inhibin levels (< 2 pg/mL) found in normal men, GnRH-deficient men before any pulsatile GnRH treatment, and men with Klinefelter's syndrome, all of which were indistinguishable from levels observed in postmenopausal women. These observations in the male raise the possibly that 1) some forms of circulating and bioactive inhibin in the human are not detected by this assay due to either their conformation or the presence of a unique binding protein for endogenous inhibin that does not bind to recombinant 32-kDa inhibin; or 2) dimeric inhibin is not a major endocrine regulator of FSH in the human male. In addition, the relatively high dimeric inhibin levels at midcycle and in the luteal phase of the normal menstrual cycle, after gonadotropin stimulation, and during pregnancy suggest that dimeric inhibin is predominantly produced by dominant follicles, corpora lutea, and placental tissues." @default.
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• W2013282836 date "1994-07-01" @default.
• W2013282836 modified "2023-09-25" @default.
• W2013282836 title "Relatively low levels of dimeric inhibin circulate in men and women with polycystic ovarian syndrome using a specific two-site enzyme-linked immunosorbent assay." @default.
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• W2013282836 doi "https://doi.org/10.1210/jcem.79.1.8027251" @default.
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