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Related Experiment Video

Updated: Feb 13, 2026

Use of the Protease Fluorescent Detection Kit to Determine Protease Activity

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Published on: August 4, 2009

ENDOSOMAL SIGNALING OF PROTEASE-ACTIVATED RECEPTOR-2 AMPLIFIES HISTAMINE-INDUCED PAIN OF IRRITABLE BOWEL SYNDROME.

Nestor N Jimenez-Vargas, Badr Sokrat, Daniella A Gilmour

Biorxiv : the Preprint Server for Biology

|February 12, 2026

Summary

Protease-activated receptor-2 (PAR ₂) signaling in endosomes amplifies histamine receptor activity, contributing significantly to irritable bowel syndrome (IBS) pain. Targeting PAR ₂ may offer effective treatment for IBS-related visceral pain.

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Area of Science:

Neuroscience
Gastroenterology
Pain Research

Background:

Proteases and histamine are elevated in irritable bowel syndrome (IBS) patients, sensitizing colonic pain receptors.
These factors contribute to the visceral pain characteristic of IBS.

Purpose of the Study:

To investigate if protease-activated receptor-2 (PAR ₂) cleavage and sustained endosomal signaling amplify histamine receptor (HR) activity.
To determine the role of this amplification in causing the recurrent pain of IBS.

Main Methods:

Coexpression of PAR ₂ and histamine H ₁ receptor (H ₁ R) in nociceptors was examined using RNAscope in situ hybridization.
Electrophysiological assays and biophysical measurements assessed nociceptor sensitization and receptor activity.

Main Results:

PAR ₂ and H ₁ R were found in human and mouse nociceptors.
Fecal supernatants from IBS patients increased colonic nociceptor sensitivity, blocked by PAR ₂ or HR antagonists.
Combined trypsin and histamine mimicked IBS patient fecal supernatant effects, causing nociceptor hyperexcitability, particularly when PAR ₂ was pre-activated.

Conclusions:

Persistent endosomal PAR ₂ signaling amplifies and sustains histamine receptor activity.
This sustained signaling is a major contributor to the colonic pain associated with IBS.