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. 2012 Aug;97(8):E1458-67.
doi: 10.1210/jc.2012-1282. Epub 2012 May 10.

Kisspeptin administration to women: a window into endogenous kisspeptin secretion and GnRH responsiveness across the menstrual cycle

Affiliations

Kisspeptin administration to women: a window into endogenous kisspeptin secretion and GnRH responsiveness across the menstrual cycle

Yee-Ming Chan et al. J Clin Endocrinol Metab. 2012 Aug.

Abstract

Context: Kisspeptin is the most powerful known stimulus of GnRH-induced LH secretion across mammalian species. However, the effects of kisspeptin are just being explored, and the dynamics of kisspeptin responsiveness across the menstrual cycle are incompletely understood.

Objective: The objective of the study was to characterize the effects of kisspeptin on GnRH secretion in healthy women in different phases of the menstrual cycle.

Participants and intervention: Ten women in the early follicular phase, three women in the late follicular (preovulatory) phase, and 14 women in the midluteal phase received a bolus of kisspeptin 112-121 0.24 nmol/kg iv. An additional four women in the early to midfollicular phase received kisspeptin 112-121 0.72 nmol/kg iv.

Results: The response to kisspeptin varied depending on the phase of the menstrual cycle. LH pulses were observed immediately after kisspeptin administration in all luteal and preovulatory women. However, only half the women in the early follicular phase had unambiguous kisspeptin responses. Increasing the kisspeptin dose did not increase the LH response in early to midfollicular phase women. Kisspeptin did not appear to reset the GnRH pulse generator in women as it does in men.

Conclusions: Differences in responses to exogenous kisspeptin across the menstrual cycle suggest that kisspeptin tone is higher in the early follicular phase compared with other cycle phases. The mechanisms that determine the timing of GnRH pulse generation in men and women appear to be distinct.

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Figures

Fig. 1.
Fig. 1.
Effects of kisspeptin on LH secretion. Representative patterns of LH secretion from two women each in the follicular (A and B), preovulatory (D and E), and luteal phases (G and H) of the menstrual cycle. Mean ± sem serum LH for all women in the early follicular (C), preovulatory (F), and luteal phases (I), aligned to the time of kisspeptin administration. Note the different y-axis in panels D–F. Arrows indicate time of kisspeptin administration; arrowheads indicate peaks of pulses.
Fig. 2.
Fig. 2.
Characteristics of LH pulses. A, Amplitude. B, AUC. C, Time from nadir to peak. NS, Not significant; Pre, before kisspeptin administration; Post, after kisspeptin administration.
Fig. 3.
Fig. 3.
Effects of kisspeptin on hormone concentrations. FSH (A) and estradiol (B) were measured in 2-h study pools.
Fig. 4.
Fig. 4.
Effects of kisspeptin on pulse intervals. A, Schematic of the predicted result if kisspeptin were to have no effect on the timing of endogenous pulses. Note that this is an idealized schematic and that actual pulse profiles show more variability in pulse intervals. A, Interval between endogenous pulses before kisspeptin; B, interval between the endogenous pulses immediately preceding and following the kisspeptin-induced pulse; B1, interval between the kisspeptin-induced pulse and the immediately preceding endogenous pulse; B2, interval between the kisspeptin-induced pulse and the immediately following endogenous pulse; C, interval between endogenous pulses after kisspeptin. B, Observed pulse intervals. Bars, Means. NS, Not significant.

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