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The endocannabinoids: Functional roles and therapeutic opportunities
Date:10/14/2007

cific cannabinoid receptors, of which the CB1 receptors are most abundant in the central nervous system. Mice whose CB1 receptors are knocked out display slower functional recovery after TBI and do not respond to treatment with 2-AG. Over the last few years several groups have noted that CB2 receptors are also formed in the brain, particularly as a reaction to numerous neurological diseases, and are apparently activated by the endocannabinoids as a protective mechanism.

Through evolution the mammalian body has developed various systems to guard against damage that may be caused by external attacks. Thus, it has an immune system, whose main role is to protect against protein attacks (microbes, parasites for example) and to reduce the damage caused by them. Analogous biological protective systems have also been developed against non-protein attacks, although they are much less well known than the immune system. Over the last few years the research group of Esther Shohami in collaboration with our group showed that the endocannabinoid system, through various biological routes, lowers the damage caused by brain trauma. Thus, it helps to attenuate the brain edema and the neurological injuries caused by it (Panikashvili et al., 2001; Panikashvili et al., 2006).

Clinical importance

Furthermore it is assumed that the endocannabinoid system may be involved in the pathogenesis of hepatic encephalopathy, a neuropsychiatric syndrome induced by fulminant hepatic failure. Indeed in an animal model the brain levels of 2-AG were found to be elevated. Administration of 2-AG improved a neurological score, activity and cognitive function (Avraham et al., 2006). Activation of the CB2 receptor by a selective agonist also improved the neurological score. The authors concluded that the endocannabinoid system may play an important role in the pathogenesis of hepatic encephalopathy. Modulation of this system either by exogenous agonists specific for the CB2 rec
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Contact: Professor Raphael Mechoulam
mechou@cc.huji.ac.il
European College of Neuropsychopharmacology
Source:Eurekalert

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