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Experimental Approach to Examine Leptin Signaling in the Carotid Bodies and its Effects on Control of Breathing

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Published on: October 25, 2019

An alternative neural basis underlying leptin resistance.

Hongli Li¹, Cunjin Su¹, Yuanzhong Xu²

¹Brown Foundation of Molecular Medicine for the Prevention of Human Diseases of McGovern Medical School, University of Texas Health Science Center at Houston, Houston, TX 77030, USA.

|June 20, 2025

Summary

Inhibition of specific hypothalamic neurons reduced diet-induced obesity. Activating these neurons caused obesity despite normal leptin signaling, revealing a new mechanism for leptin resistance.

Keywords:

CP: Metabolism GABAergic neurons HFD arcuate nucleus diet-induced obesity feeding leptin leptin receptor leptin resistance obesity pSTAT3

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Area of Science:

Neuroscience
Metabolic Disorders
Obesity Research

Background:

The global obesity epidemic is exacerbated by overconsumption of palatable Western diets.
Central leptin resistance is a key factor in diet-induced obesity (DIO).
Understanding the molecular mechanisms of leptin resistance is crucial for developing effective anti-obesity strategies.

Purpose of the Study:

To investigate the role of hypothalamic arcuate GABAergic neurons (Arc^GABA) in diet-induced obesity.
To elucidate the contribution of Arc^GABA non-leptin receptor (non-LepR) neurons to leptin resistance.
To identify novel therapeutic targets for obesity.

Main Methods:

Chronic inhibition and activation of hypothalamic Arc^GABA neurons in rodent models.
Assessment of diet-induced obesity (DIO) development and reversal.
Evaluation of leptin signaling pathways, including pSTAT3 phosphorylation.

Main Results:

Chronic inhibition of Arc^GABA neurons significantly reduced DIO.
Palatable food intake increased activity in Arc^GABA non-LepR neurons.
Activation of Arc^GABA non-LepR neurons induced obesity with phenotypic leptin resistance, despite intact leptin-pSTAT3 signaling.
Inhibition of Arc^GABA non-LepR neurons prevented and reversed DIO.

Conclusions:

Obesogenic stimulation of Arc^GABA non-LepR neurons contributes to obesity independently of leptin-pSTAT3 signaling.
These neurons represent a novel neural basis for leptin resistance.
Targeting Arc^GABA non-LepR neurons offers a potential anti-obesity treatment strategy.