Cannabinoid receptor 2 is increased in acutely and chronically inflamed bladder of rats.

“Cannabinoid receptors are expressed in the urinary bladder and may affect bladder function… CB2 receptors may be a viable target for pharmacological treatment of bladder inflammation and associated pain…

In this study, we have shown that CB1 and CB2 are present in the bladder and its innervation, and that expression of CB2 is increased in the bladders of rats with acute and chronic cystitis. Bladder inflammation and pain is the summation of a number of biological events, including participation of the endocannabinoid system.

The endocannabinoid system could play an important role in modulation of severity of bladder inflammation and pain, and it may be possible to take advantage of the cannabinoid system in the bladder to decrease inflammation and resultant pain.”

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2592089/

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