Ceramide: a new second messenger of cannabinoid action
Cannabinoids, the active components of Cannabis sativa (marijuana), and their endogenous counterparts exert their effects by binding to specific Gi/o-proteincoupled receptors that modulate adenylyl cyclase, ion channels and extracellular signal-regulated kinases. Recent research has shown that the CB1 cannabinoid receptor is coupled to the generation of the lipid second messenger ceramide via two different pathways: sphingomyelin hydrolysis, and ceramide synthesis de novo. Ceramide in turn mediates cannabinoidinduced apoptosis, as shown by in vitro and in vivo studies. These findings provide a new perspective on how cannabinoids act, and raise exciting physiological and therapeutic questions
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