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Related Experiment Video

Updated: Apr 3, 2026

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Abnormal trigeminal sensory processing in obese mice.

Heather L Rossi¹, Kimberly A Broadhurst, Anthony S K Luu

¹Departments of Neurology and Pediatrics, The Children's Hospitals of Philadelphia and the University of Pennsylvania, Philadelphia, PA, USA Departments of Neurology and Pharmacology, Carver College of Medicine, University of Iowa, Iowa City, IA, USA.

|September 24, 2015

Summary

This summary is machine-generated.

Obesity alters trigeminal nerve function, leading to heightened sensitivity and abnormal sensory processing. This research explores how obesity impacts headache mechanisms via the trigeminal system in mice.

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Area of Science:

Neuroscience
Physiology
Obesity Research

Background:

Obesity is linked to various pain conditions, notably headaches.
The specific impact of obesity on the trigeminal nociceptive system, crucial for headache, is not well understood.

Purpose of the Study:

To investigate the functional consequences of obesity on the trigeminal nociceptive system.
To determine if obesity affects capsaicin-induced nocifensive behavior and photophobia.

Main Methods:

Utilized two mouse models of obesity: high-fat diet and leptin deficiency.
Assessed capsaicin-induced nocifensive behavior and photophobia.
Employed calcium imaging to analyze trigeminal afferent neuron activity in vitro.

Main Results:

Obese mice exhibited normal acute responses to capsaicin but developed photophobia at lower doses than controls.
Increased calcium influx was observed in trigeminal ganglia neurons from obese mice.
A higher proportion of medium to large diameter neurons responded to capsaicin in obese mice.

Conclusions:

Obesity induces functional alterations in the trigeminal system, potentially contributing to aberrant sensory processing.
These findings suggest a link between obesity, trigeminal system dysfunction, and headache pathophysiology.