KML29, an O-hexafluoroisopropyl (HFIP) carbamate analogue of JZL184. is a potent and orally active monoacylglycerol lipase (monoglyceride lipase; MAGL; MGLL; MGL) inhibitor (IC50 = 5.9/15/43 nM against human/mouse/rat MAGL) that targets MAGL active site with greatly improved selectivity (rat/mouse ABHD6 IC50 = 1.60/4.87; no inhibitory activity against human/rat/mouse fatty acid amide hydrolase (FAAH) up to 50 μM). KML29 in vivo treatment results in a selective upregulation of 2-arachidonoyl glycerol (2-AG), but not N-arachidonoyl-ethanolamine (AEA) in mice (brain Emax ∼20 mg/kg p.o. or i.p.; peripheral Emax ∼1 mg/kg p.o.) and rats (brain Emax ∼40 mg/kg i.p.). KML29 reduces inflammatory and neuropathic nociceptive behaviour in animal studies without cannabimimetic side effects seen with dual FAAH & MAGL inhibition, chronic administration, however, leads to CB1 receptor desensitization as observed with other MAGL inhibitors.
Orally active, potent and highly selective monoacylglycerol lipase (MAGL) inhibitor with in vivo analgesic efficacy without cannabimimetic side effects.
