Dynamic changes in circulating inhibin levels during the luteal-follicular transition of the human menstrual cycle

The Journal of Clinical Endocrinology and Metabolism
S J RoseffS S Yen

Abstract

Dynamic changes in serum immunoreactive (ir) inhibin levels during the transition from the luteal to the follicular phase (luteal-follicular transition) were characterized during 3 consecutive cycles in 12 cycling women. Both spontaneous (first to second cycle) and GnRH antagonist-imposed premature luteolysis (second to third cycle) were evaluated. Serum FSH, LH, estradiol (E2), and progesterone (P4) levels were monitored daily by RIA for the entire study. Daily ir-inhibit levels were determined from 7 days before until 7 days after the onset of menses and from 4 days before to 10 days after the GnRH antagonist-induced bleeding by a heterologous RIA. During spontaneous luteolysis, ir-inhibin levels peaked 7 days before menses and declined in a linear fashion (r = -0.99) thereafter, reaching a sustained low level 1 day after the onset of menses. The decline of P4 and E2 levels appears to be coupled to that of ir-inhibin (r = 0.98 and r = 0.95, respectively). FSH levels showed an inverse pattern, with an acute elevation unaccompanied by LH, for 5 days before the onset of menses and reaching a plateau 2 days after. ir-Inhibin and FSH were negatively correlated (r = -0.87; P less than 0.0001). Increased LH levels did not occur unti...Continue Reading

Citations

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