Increased Expression of Cannabinoid CB1 Receptors in Achilles Tendinosis
Author Information
Author(s): Björklund Emmelie, Forsgren Sture, Alfredson Håkan, Fowler Christopher J.
Primary Institution: Umeå University, Umeå, Sweden
Hypothesis
Is the expression of cannabinoid receptor 1 (CB1) altered in human Achilles tendons from patients with Achilles tendinosis compared to healthy individuals?
Conclusion
Expression of cannabinoid receptor 1 is increased in human Achilles tendinosis suggesting that the cannabinoid system may be dysregulated in this disorder.
Supporting Evidence
- CB1 receptor immunoreactivity was significantly higher in tenocytes from patients with Achilles tendinosis compared to healthy controls.
- Immunoreactivity was observed in blood vessel walls and perineurium of nerves in tendinosis samples.
- Tenocytes in tendinosis showed abnormal morphology and increased CB1 expression.
Takeaway
The study found that a specific receptor related to cannabinoids is more active in people with Achilles tendon pain than in healthy people.
Methodology
The study evaluated cannabinoid CB1 receptor immunoreactivity in biopsies from individuals with Achilles tendinosis compared to healthy controls.
Limitations
The study did not explore the functional implications of increased CB1 receptor expression in tenocytes.
Participant Demographics
24 individuals (11 males, 13 females; mean age 48 years) with 17 patients suffering from Achilles tendinosis and 7 healthy controls.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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