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09:39
Hypothalamic Kisspeptin Neurons as a Target for Whole-Cell Patch-Clamp Recordings
Published on: March 17, 2023
Kisspeptin resets the hypothalamic GnRH clock in men
Yee-Ming Chan1, James P Butler, Nancy E Pinnell
1Harvard Reproductive Sciences Center and Reproductive Endocrine Unit, Department of Medicine, Massachusetts General Hospital, 55 Fruit Street, BHX 5, Boston, Massachusetts 02114, USA. ymchan@partners.org
The Journal of Clinical Endocrinology and Metabolism
|April 8, 2011
Summary
Kisspeptin administration in men triggers immediate and larger LH pulses, resetting the hypothalamic GnRH pulse generator. This finding reveals kisspeptin
Area of Science:
- Reproductive Endocrinology
- Neuroendocrinology
Background:
- Mammalian reproduction relies on hypothalamic gonadotropin-releasing hormone (GnRH) pulses.
- The precise mechanisms governing GnRH pulse timing remain unclear.
- Kisspeptin is known to stimulate GnRH secretion, but its effect on GnRH pulse generation is unexplored.
Purpose of the Study:
- To investigate the effects of kisspeptin on GnRH secretion, assessed via luteinizing hormone (LH) release, in healthy adult men.
Main Methods:
- Thirteen healthy men received a single intravenous bolus of kisspeptin (amino acids 112-121).
- LH secretion was monitored to reflect GnRH pulse generation.
Main Results:
- Kisspeptin induced an immediate LH pulse, irrespective of prior endogenous pulses.
- Kisspeptin-induced LH pulses were significantly larger than endogenous pulses (5.0 vs. 2.1 mIU/ml).
- Kisspeptin administration appeared to reset the GnRH pulse generator, delaying subsequent endogenous pulses.
Conclusions:
- Kisspeptin is the first identified agent capable of resetting the hypothalamic GnRH pulse generator.
- Kisspeptin serves as a valuable physiological tool for studying GnRH pulse generation.
- This research offers insights into the fundamental mechanisms of biological clocks.
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