Actions of the dual FAAH/MAGL inhibitor JZL195 in a murine inflammatory pain model. — The Association Specialists

Actions of the dual FAAH/MAGL inhibitor JZL195 in a murine inflammatory pain model. (301)

Wayne B Anderson 1 , Michael J Gould , Romeo D Torres , Vanessa A Mitchell , Christopher W Vaughan
  1. Pain Management Research Institute, Kolling Institute of Medical Research, Northern Clinical School, University of Sydney at Royal North Shore Hospital St Leonards, NSW, Australia
The analgesic efficacy of cannabinoids in chronic pain models is thought to be limited by side-effects. It has been proposed that this might be overcome by using agents which indirectly activate the endocannabinoid system. We directly compared the analgesic versus side-effects profile of the dual FAAH/MAGL inhibitor JZL195 to that of a pan-cannabinoid receptor agonist WIN55212 in an inflammatory pain model. Systemic injections of a range of doses of JZL195 and WIN55212 were performed 1 – 2 days following intraplantar injection of CFA in C57BL/6 mice. Mechanical allodynia and thermal hyperalgesia were measured with von Frey hairs and a Hargreaves device. Motor co-ordination, catalepsy and locomotor activity were measured with the rotarod, bar test and low light open field. JZL195 and WIN55212 both reduced mechanical allodynia and produced cannabinoid-like catalepsy and sedation in a dose dependent manner. Unlike WIN55212, JZL195 reduced allodynia at doses below those at which side-effects were observed. JZL195, displayed a threefold greater therapeutic index than WIN55212. The effects of JZL195 and WIN55212 were abolished by co-application with the CB1 antagonist AM251. The CB2 antagonist also reduced the JZL anti-allodynia, and reversed the WIN55212 anti-allodynia. These findings suggest that the dual FAAH/MAGL inhibitor JZL195 displays a greater therapeutic index than a pan cannabinoid receptor agonist in an inflammatory pain model. Thus, dual FAAH/MAGL inhibition has the potential to alleviate inflammatory pain without the side-effects associated with cannabinoids.