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Leptin action on ARC-PVN neural circuit regulates ejaculation behavior by altering sympathetic neuroplasticity
Qi-Jie Zhang1,2, Jiao-Chen Luan1, Qi Gu1
1Department of Urology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China.
Andrology
|January 3, 2025
Summary
Chronic leptin administration, not acute, promotes ejaculation in male mice by modulating sympathetic nervous system activity. This involves the arcuate nucleus-paraventricular nucleus circuit and increases dendritic spine density.
Area of Science:
- Neuroendocrinology
- Reproductive Biology
- Neuroscience
Background:
- The relationship between leptin and premature ejaculation is observed clinically, but its regulatory role in ejaculation is unclear.
- Understanding leptin's mechanism in ejaculatory behavior is crucial for potential therapeutic interventions.
Purpose of the Study:
- To investigate the specific role of leptin in regulating male ejaculatory behaviors.
- To elucidate the underlying neural and physiological mechanisms involved in leptin's action on ejaculation.
Main Methods:
- Copulation behavior tests were conducted in male mice following acute and chronic leptin administration (peripheral and central).
- Sympathetic nervous system activity was assessed via lumbar sympathetic nerve activity, serum noradrenaline, and sympathetic fiber distribution in reproductive tissues.
- Neural circuit mechanisms were explored using viral vectors, immunohistochemistry, optogenetics, and Golgi staining to analyze dendritic spine density.
Main Results:
- Acute leptin administration did not affect ejaculation latency. Chronic leptin administration significantly reduced both mount and ejaculation latencies.
- Chronic leptin treatment increased sympathetic innervation in the vas deferens and seminal vesicles.
- The arcuate nucleus-paraventricular nucleus circuit and paraventricular nucleus glutamatergic neurons were identified as key players, with increased dendritic spine density in the parvocellular region observed.
Conclusions:
- Leptin's effect on ejaculation is chronic, not acute, influencing ejaculatory behavior through modulation of sympathetic neuroplasticity.
- The arcuate nucleus-paraventricular nucleus pathway and glutamatergic neurons in the paraventricular nucleus are critical for leptin's pro-ejaculatory effects.
- Increased dendritic spine density in the parvocellular region of the paraventricular nucleus may contribute to leptin's regulation of ejaculation.
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