Mitochondrial CB1 receptor is involved in ACEA-induced protective effects on neurons and mitochondrial functions.

Abstract:

:Mitochondrial dysfunction contributes to cell death after cerebral ischemia/reperfusion (I/R) injury. Cannabinoid CB1 receptor is expressed in neuronal mitochondrial membranes (mtCB1R) and involved in regulating mitochondrial functions under physiological conditions. However, whether mtCB1R affords neuroprotection against I/R injury remains unknown. We used mouse models of cerebral I/R, primary cultured hippocampal neurons exposed to oxygen-glucose deprivation/reoxygenation (OGD/R) and Ca(2+)-induced injury in purified neuronal mitochondria to investigate the role of mtCB1R in neuroprotection. Our results showed selective cell-permeant CB1 receptor agonist, arachidonyl-2-chloroethylamide (ACEA), significantly up-regulated the expression of mtCB1R protein in hippocampal neurons and tissue. In vitro, ACEA restored cell viability, inhibited generation of reactive oxygen species (ROS), decreased lactate dehydrogenase (LDH) release and reduced apoptosis, improved mitochondrial function. In vivo, ACEA ameliorated neurological scores, diminished the number of TUNEL-positive neurons and decreased the expression of cleaved caspase-3. However, ACEA-induced benefits were blocked by the selective cell-permeant CB1 receptor antagonist AM251, but just partially by the selective cell-impermeant CB1 receptor antagonist hemopressin. In purified neuronal mitochondria, mtCB1R activation attenuated Ca(2+)-induced mitochondrial injury. In conclusion, mtCB1R is involved in ACEA-induced protective effects on neurons and mitochondrial functions, suggesting mtCB1R may be a potential novel target for the treatment of brain ischemic injury.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Ma L,Jia J,Niu W,Jiang T,Zhai Q,Yang L,Bai F,Wang Q,Xiong L

doi

10.1038/srep12440

subject

Has Abstract

pub_date

2015-07-28 00:00:00

pages

12440

issn

2045-2322

pii

srep12440

journal_volume

5

pub_type

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