Increased TRPV1 Nerve Fibres in Irritable Bowel Syndrome
Author Information
Author(s): Akbar A, Yiangou Y, Facer P, Walters J R F, Anand P, Ghosh S
Primary Institution: Imperial College London
Hypothesis
The capsaicin receptor TRPV1 may play an important role in visceral pain and hypersensitivity states in irritable bowel syndrome (IBS).
Conclusion
Increased TRPV1 nerve fibres are observed in IBS, which may contribute to visceral hypersensitivity and pain.
Supporting Evidence
- A significant 3.5-fold increase in median numbers of TRPV1-immunoreactive fibres was found in biopsies from IBS patients compared with controls.
- Substance P-immunoreactive fibres were also significantly increased in the IBS group.
- Multivariate regression analysis showed that TRPV1-immuno-reactive fibres were significantly related to the abdominal pain score.
Takeaway
People with irritable bowel syndrome have more nerve fibers that react to a spicy ingredient called capsaicin, which might make their stomachs hurt more.
Methodology
Rectosigmoid biopsies were collected from 23 IBS patients and 22 controls, and TRPV1-immunoreactive nerve fibres were quantified using immunohistochemistry.
Potential Biases
Potential selection bias in choosing control subjects from patients undergoing colonoscopy for other indications.
Limitations
The study did not account for potential confounding factors such as psychological assessments and the effects of bowel preparation methods.
Participant Demographics
IBS patients: 23 (3 males, 20 females), Controls: 22 (7 males, 15 females), Age range: IBS 21-77 years, Controls 55-75 years.
Statistical Information
P-Value
p<0.0001
Statistical Significance
p<0.0001
Digital Object Identifier (DOI)
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