Inconsequential role for chemerin‐like receptor 1 in the manifestation of ozone‐induced lung pathophysiology in male mice

Abstract

We executed this study to determine if chemerin‐like receptor 1 (CMKLR1), a Gi/o protein‐coupled receptor expressed by leukocytes and non‐leukocytes, contributes to the development of phenotypic features of non‐atopic asthma, including airway hyperresponsiveness (AHR) to acetyl‐β‐methylcholine chloride, lung hyperpermeability, airway epithelial cell desquamation, and lung inflammation. Accordingly, we quantified sequelae of non‐atopic asthma in wild‐type mice and mice incapable of expressing CMKLR1 (CMKLR1‐deficient mice) following cessation of acute inhalation exposure to either filtered room air (air) or ozone (O3), a criteria pollutant and non‐atopic asthma stimulus. Following exposure to air, lung elastic recoil and airway responsiveness were greater while the quantity of adiponectin, a multi‐functional adipocytokine, in bronchoalveolar lavage (BAL) fluid was lower in CMKLR1‐deficient as compared to wild‐type mice. Regardless of genotype, exposure to O3 caused AHR, lung hyperpermeability, airway epithelial cell desquamation, and lung inflammation. Nevertheless, except for minimal genotype‐related effects on lung hyperpermeability and BAL adiponectin, we observed no other genotype‐related differences following O3 exposure. In summary, we demonstrate that CMKLR1 limits the severity of innate airway responsiveness and lung elastic recoil but has a nominal effect on lung pathophysiology induced by acute exposure to O3.