PMID: 20632970Jul 17, 2010Paper

Cannabinoid receptors and endocannabinoids: role in neuroinflammatory and neurodegenerative disorders

CNS & Neurological Disorders Drug Targets
Tiziana Bisogno, V Di Marzo

Abstract

The G-protein coupled receptors for Δ⁹-tetrahydrocannabinol, the major psychoactive principle of marijuana, are known as cannabinoid receptors of type 1 (CB₁) and 2 (CB₂) and play important functions in degenerative and inflammatory disorders of the central nervous system. Whilst CB₁ receptors are mostly expressed in neurons, where they regulate neurotransmitter release and synaptic strength, CB₂ receptors are found mostly in glial cells and microglia, which become activated and over-express these receptors during disorders such as Alzheimer's disease, multiple sclerosis, amyotropic lateral sclerosis, Parkinson's disease, and Huntington's chorea. The neuromodulatory actions at CB₁ receptors by endogenous agonists ('endocannabinoids'), of which anandamide and 2-arachidonoylglycerol are the two most studied representatives, allows them to counteract the neurochemical unbalances arising during these disorders. In contrast, the immunomodulatory effects of these lipophilic mediators at CB₂ receptors regulate the activity and function of glia and microglia. Indeed, the level of expression of CB₁ and CB₂ receptors or of enzymes controlling endocannabinoid levels, and hence the concentrations of endocannabinoids, undergo time- and brai...Continue Reading

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