Intranasal leptin alleviates obesity hypoventilation syndrome via serotonergic pathways in diet-induced obese mice
Intranasal leptin enhanced the hypercapnic ventilatory response, increased arousal latency in males, 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 innervating the hypoglossal motoneurons, indicating leptin acts through medullary raphe serotonergic pathways.
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Intranasal 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
Intranasal 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 stimulates medullary raphe serotonergic neurons
- ▸These serotonergic neurons project to hypoglossal motoneurons (XII MN)
- ▸Activation of XII MN increases genioglossus muscle activity
- ▸Enhanced pharyngeal muscle tone attenuates upper airway obstruction and increases 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 (dose not specified in abstract)
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Study conducted in an animal model (mice), not in humans
- ▸Sex-specific effect on arousal latency observed only in males, limiting generalizability
- ▸Dose of intranasal leptin not specified in abstract
Frequently Asked Questions
What is obesity hypoventilation syndrome (OHS)?▼
OHS is a breathing disorder in obese individuals characterized by inadequate ventilation during sleep, leading to low oxygen and high carbon dioxide levels.
How does leptin affect breathing during sleep?▼
Leptin enhances the hypercapnic ventilatory response, increases genioglossus muscle activity, reduces pharyngeal obstruction, and increases minute ventilation during NREM and REM sleep.
Why were serotonergic neurons targeted in this study?▼
Previous research showed that respiratory effects of leptin can be attenuated by serotonergic antagonists, suggesting serotonin pathways mediate leptin's effects on breathing.
Is intranasal leptin a potential treatment for OHS in humans?▼
This study suggests intranasal leptin may be a promising pharmacotherapy for OHS, but human trials are needed to confirm efficacy and safety.
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