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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Br+J+Pharmacol
2014 ; 171
(23
): 5225-36
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Endocannabinoid modulation by FAAH and monoacylglycerol lipase within the
analgesic circuitry of the periaqueductal grey
#MMPMID25041240
Lau BK
; Drew GM
; Mitchell VA
; Vaughan CW
Br J Pharmacol
2014[Dec]; 171
(23
): 5225-36
PMID25041240
show ga
BACKGROUND AND PURPOSE: Endogenous cannabinoids (endocannabinoids) in the
periaqueductal grey (PAG) play a vital role in mediating stress-induced
analgesia. This analgesic effect of endocannabinoids is enhanced by
pharmacological inhibition of their degradative enzymes. However, the specific
effects of endocannabinoids and the inhibitors of their degradation are largely
unknown within this pain-modulating region. EXPERIMENTAL APPROACH: In vitro
electrophysiological recordings were conducted from PAG neurons in rat midbrain
slices. The effects of the major endocannabinoids and their degradation
inhibitors on inhibitory GABAergic synaptic transmission were examined. KEY
RESULTS: Exogenous application of the endocannabinoid, anandamide (AEA), but not
2-arachidonoylglycerol (2-AG), produced a reduction in inhibitory GABAergic
transmission in PAG neurons. This AEA-induced suppression of inhibition was
enhanced by the fatty acid amide hydrolase (FAAH) inhibitor, URB597, whereas a
2-AG-induced suppression of inhibition was unmasked by the monoacylglycerol
lipase (MGL) inhibitor, JZL184. In addition, application of the CB1 receptor
antagonist, AM251, facilitated the basal GABAergic transmission in the presence
of URB597 and JZL184, which was further enhanced by the dual FAAH/MGL inhibitor,
JZL195. CONCLUSIONS AND IMPLICATIONS: Our results indicate that AEA and 2-AG act
via disinhibition within the PAG, a cellular action consistent with analgesia.
These actions of AEA and 2-AG are tightly regulated by their respective
degradative enzymes, FAAH and MGL. Furthermore, individual or combined inhibition
of FAAH and/or MGL enhanced tonic disinhibition within the PAG. Therefore, the
current findings support the therapeutic potential of FAAH and MGL inhibitors as
a novel pharmacotherapy for pain.