Lung inflammation plays a crucial role in the pathogenesis of many respiratory diseases that are in need of new therapeutic strategies. Previously, we showed that inhibition of α/β-hydrolase domain 6 (ABHD6) decreased macrophage activation and exerted anti-inflammatory effects. Therefore, we thought to assess the effects of ABHD6 inhibition in a mouse model of acute lung injury (ALI) induced by intratracheal administration of lipopolysaccharides. ABHD6 inhibition with N-methyl-N-{[3-(4-pyridinyl)phenyl]methyl}-carbamic acid 4'-(aminocarbonyl)(1,1'-biphenyl)-4-yl ester (WWL70) decreases most of the hallmarks of ALI, including neutrophil infiltration, cytokine secretion, and protein extravasation. mRNA expression of proinflammatory markers in the cells recovered in the bronchoalveolar lavage was also decreased. Interestingly, ABHD6 inhibition was more efficient than monoacylglycerol lipase inhibition by 4-nitrophenyl-4-[dibenzo(d)(14)dioxol-5-yl(hydroxy)methyl]piperidine-1-carboxylate. We also studied ABHD6 inhibition on primary alveolar macrophages and neutrophils to explore their potential implication in the effects of ABHD6 inhibition in vivo. Moreover, we quantified by high-performance liquid chromatography-mass spectrometry the levels of reported substrates of ABHD6 [i.e., 2-arachidonoylglycerol (2-AG) and lysophospholipids]. The potential implication of these lipid mediators in the effects of WWL70 was further investigated on primary alveolar macrophages. Taken together, these data support ABHD6 inhibition as an interesting anti-inflammatory strategy in acute lung inflammation and assess the possible contribution of 2-AG and lysophospholipids in the observed effects.-Bottemanne, P., Paquot, A., Ameraoui, H., Alhouayek, M., Muccioli, G. G. The α/β-hydrolase domain 6 inhibitor WWL70 decreases endotoxin-induced lung inflammation in mice, potential contribution of 2-arachidonoylglycerol, and lysoglycerophospholipids.
Keywords: MAGL; PGE; bioactive lipid; prostaglandin; serine hydrolase.