Experimental autoimmune encephalomyelitis disrupts endocannabinoid-mediated neuroprotection.
Focal cerebral ischemia and traumatic brain injury induce an escalating amount of cell death because of harmful mediators diffusing from the original lesion site. Evidence suggests that healthy cells surrounding these lesions attempt to protect themselves by producing endocannabinoids (eCBs) and activating cannabinoid receptors, the molecular target for marijuana-derived compounds. Indeed, activation of cannabinoid receptors reduces the production and diffusion of harmful mediators. Here, we provide evidence that an exception to this pattern is found in experimental autoimmune encephalomyelitis (EAE), a mouse model of multiple sclerosis. We show that cell damage induced by EAE does not lead to increase in eCBs, even though cannabinoid receptors are functional because synthetic cannabinoid agonists are known to confine EAE-induced lesions. This lack of eCB increase is likely due to IFN-gamma, which is released by primed T cells invading the CNS. We show that IFN-gamma disrupts the functionality of purinergic P2X7 receptors, a key step controlling eCB production by microglia, the main source of eCBs in brain. Accordingly, induction of EAE in P2X7-/- mice results in even lower eCB levels and more pronounced cell damage than in wild-type mice. Our data suggest that the high level of CNS IFN-gamma associated with EAE disrupts eCB-mediated neuroprotection while maintaining functional cannabinoid receptors, thus providing additional support for the use of cannabinoid-based medicine to treat multiple sclerosis.
Department of Pharmacology, Anesthesiology, Comparative Medicine, University of Washington, Seattle, WA 98195, USA.
Anke
A
Witting
Lanfen
L
Chen
Eiron
E
Cudaback
Alex
A
Straiker
Lisa
L
Walter
Barry
B
Rickman
Thomas
T
Möller
Celia
C
Brosnan
Nephi
N
Stella
D000818:Animals; D063386:Cannabinoid Receptor Agonists; D063385:Cannabinoid Receptor Modulators / Q000378:metabolism*; D002490:Central Nervous System / Q000276:immunology; D004681:Encephalomyelitis, Autoimmune, Experimental / Q000276:immunology* / Q000378:metabolism; D063388:Endocannabinoids; D007371:Interferon-gamma / Q000378:metabolism*; D051379:Mice; D008817:Mice, Mutant Strains; D017628:Microglia / Q000378:metabolism; D009103:Multiple Sclerosis / Q000276:immunology* / Q000378:metabolism; D018696:Neuroprotective Agents / Q000378:metabolism*; D043882:Receptors, Cannabinoid / Q000378:metabolism; D018048:Receptors, Purinergic P2 / Q000235:genetics / Q000502:physiology*; D058486:Receptors, Purinergic P2X7; D013601:T-Lymphocytes / Q000276:immunology
D063386:Cannabinoid Receptor Agonists; D063385:Cannabinoid Receptor Modulators; D063388:Endocannabinoids; D018696:Neuroprotective Agents; C546469:P2rx7 protein, mouse; D043882:Receptors, Cannabinoid; D018048:Receptors, Purinergic P2; D058486:Receptors, Purinergic P2X7; D007371:Interferon-gamma