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Related Experiment Video

Updated: May 11, 2026

Establishing a Mouse Model of a Pure Small Fiber Neuropathy with the Ultrapotent Agonist of Transient Receptor Potential Vanilloid Type 1

Establishing a Mouse Model of a Pure Small Fiber Neuropathy with the Ultrapotent Agonist of Transient Receptor Potential Vanilloid Type 1

Published on: February 13, 2018

Sensing tissue ischemia: another new function for capsaicin receptors?

Hui-Lin Pan¹, Shao-Rui Chen

¹Department of Anesthesiology, H187, Pennsylvania State University College of Medicine, and the Milton S. Hershey Medical Center, 500 University Dr, Hershey, PA 17033-0850, USA. hpan@psu.edu

|September 15, 2004

Summary

The vanilloid receptor-1 (VR1) on cardiac sensory nerves detects myocardial ischemia. Blocking VR1 with antagonists significantly reduces nerve activation during ischemia and bradykinin application.

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Published on: May 2, 2025

Area of Science:

Cardiovascular Physiology
Neuroscience
Pain Signaling

Background:

Chest pain is a key symptom of myocardial ischemia, but its signaling pathways are unclear.
The vanilloid receptor-1 (VR1) is a cation channel on nociceptive neurons, found on cardiac sensory nerve endings.
The role of VR1 in activating cardiac nerves during ischemia was investigated.

Purpose of the Study:

To determine the role of vanilloid receptor-1 (VR1) in the activation of cardiac spinal afferent nerves during myocardial ischemia.

Main Methods:

Recorded single-unit activity of cardiac afferents in anesthetized ferrets.
Induced regional myocardial ischemia and applied bradykinin.
Administered VR1 antagonists (iodoresiniferatoxin) and blockers (ruthenium red) to assess their effects on afferent nerve activity.

Main Results:

Cardiac afferents responded to myocardial ischemia and bradykinin.
Iodoresiniferatoxin significantly attenuated the afferent response to both ischemia and bradykinin.
Ruthenium red demonstrated similar inhibitory effects on afferent responses.

Conclusions:

Provides the first functional evidence that VR1 mediates ischemic stimulation of cardiac spinal afferent nerves.
Suggests VR1 acts as a molecular sensor for tissue ischemia on cardiac sensory nerves, activating cardiac nociceptors.