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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 

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The endogenous cannabinoid anandamide, but not the CB2 ligand palmitoylethanolamide, prevents the viscero-visceral hyper-reflexia associated with inflammation of the rat urinary bladder.

Anandamide, an endogenous ligand at the CB1 cannabinoid receptor and palmitoylethanolamide (a putative endogenous ligand at the CB2 receptor) have both been shown to possess anti-hyperalgesic properties in models of somatic and visceral inflammation. In the turpentine-inflamed rat urinary bladder a reversal of the inflammation-associated viscero-visceral hyperreflexia (VVH) was observed when the cannabinoids were administered 135 min after the induction of inflammation. Therefore, in this study we determined the efficacy of these two N-acylethanolamides in the prevention of VVH in the same model, using a prophylactic dosing regimen. Palmitoylethanolamide did not prevent the VVH (in the dose range 10-30 mg/kg, i.a), but anandamide attenuated the response in a dose related manner, with a threshold of 25 mg/kg (i.a). These findings provide further support for an acute anti-nociceptive and anti-hyperalgesic role for CB1 receptor agonists, with CB2 agonist effects only becoming important once the effects of inflammation are established.[1]

References

  1. The endogenous cannabinoid anandamide, but not the CB2 ligand palmitoylethanolamide, prevents the viscero-visceral hyper-reflexia associated with inflammation of the rat urinary bladder. Jaggar, S.I., Sellaturay, S., Rice, A.S. Neurosci. Lett. (1998) [Pubmed]
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