Leptin alleviates obesity hypoventilation syndrome via serotonergic pathways in diet-induced obese mice
Intranasal leptin enhanced the hypercapnic ventilatory response, increased genioglossus muscle activity during wake and NREM sleep, attenuated pharyngeal obstruction, and increased minute ventilation during NREM and REM sleep in diet-induced obese mice. These effects were abolished by ablation of serotonergic neurons projecting to hypoglossal motoneurons, indicating leptin acts through medullary raphe serotonergic pathways.
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Leptin alleviates obesity hypoventilation syndrome via serotonergic pathways in diet-induced obese mice The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 24/100 (low).
The Claim
Leptin alleviates obesity hypoventilation syndrome via serotonergic pathways in diet-induced obese mice
This conclusion is most relevant to: Diet-induced obese (DIO) Sert-flp mice expressing FlpO recombinase in serotonergic neurons.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸Leptin alleviates obesity hypoventilation via serotonergic pathways. (bioRxiv : the preprint server for biology, 2026) —
How It Works
The proposed biological pathway:
- ▸Leptin administered intranasally reaches medullary raphe serotonergic neurons
- ▸Serotonergic neurons project to hypoglossal motoneurons (XII MN)
- ▸Activation of XII MN increases genioglossus muscle activity
- ▸Increased pharyngeal muscle tone attenuates upper airway obstruction and improves ventilation during sleep
Who Might Benefit
Evidence fit by population:
- ▸Diet-induced obese (DIO) Sert-flp mice expressing FlpO recombinase in serotonergic neurons
Recommended Dose
Intranasal leptin (specific dose not reported in abstract)
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Animal model (mice) limits direct translation to human obesity hypoventilation syndrome
- ▸Sex-specific effect on arousal latency (males only) not fully explained
- ▸Specific leptin dose and route not detailed in abstract
Frequently Asked Questions
What is obesity hypoventilation syndrome (OHS)?▼
OHS is a condition in obese individuals characterized by inadequate breathing during sleep, leading to low oxygen and high carbon dioxide levels, often with upper airway obstruction.
How does leptin affect breathing in this study?▼
Intranasal leptin enhanced the hypercapnic ventilatory response, increased genioglossus muscle activity, reduced pharyngeal obstruction, and increased ventilation during sleep in obese mice.
Why were serotonergic neurons targeted?▼
Previous research showed leptin's respiratory effects are attenuated by serotonergic antagonists, and this study confirmed that medullary raphe serotonergic neurons projecting to hypoglossal motoneurons are necessary for leptin's benefits.
Are there any sex differences reported?▼
Yes, leptin increased arousal latency in male mice but not in females, suggesting a sex-specific effect.
References
- 1.Davaanyam D, Ruiz MA, de Deus JL, Shin MK, Winston CR, Wang X, Amorim MR, Mendelowitz D, Polotsky VY. “Leptin alleviates obesity hypoventilation via serotonergic pathways..” bioRxiv : the preprint server for biology, 2026. PMID: 42427597 DOI: 10.64898/2026.06.23.734005