Pulmonary, Critical Care and Sleep Medicine, Ohio State University Wexner Medical Center, Davis Heart and Lung Research Institute, Columbus, Ohio 43210, USA.
Department of Pharmacology and Toxicology, Brody School of Medicine, East Carolina University, Greenville, North Carolina 27858, USA.
Toxicol Sci. 2021 Aug 30;183(1):170-183. doi: 10.1093/toxsci/kfab081.
Ozone (O3) is a criteria air pollutant known to increase the morbidity and mortality of cardiopulmonary diseases. This occurs through a pulmonary inflammatory response characterized by increased recruitment of immune cells into the airspace, pro-inflammatory cytokines, and pro-inflammatory lipid mediators. Recent evidence has demonstrated sex-dependent differences in the O3-induced pulmonary inflammatory response. However, it is unknown if this dimorphic response is evident in pulmonary lipid mediator metabolism. We hypothesized that there are sex-dependent differences in lipid mediator production following acute O3 exposure. Male and female C57BL/6J mice were exposed to 1 part per million O3 for 3 h and were necropsied at 6 or 24 h following exposure. Lung lavage was collected for cell differential and total protein analysis, and lung tissue was collected for mRNA analysis, metabololipidomics, and immunohistochemistry. Compared with males, O3-exposed female mice had increases in airspace neutrophilia, neutrophil chemokine mRNA, pro-inflammatory eicosanoids such as prostaglandin E2, and specialized pro-resolving mediators (SPMs), such as resolvin D5 in lung tissue. Likewise, precursor fatty acids (arachidonic and docosahexaenoic acid; DHA) were increased in female lung tissue following O3 exposure compared with males. Experiments with ovariectomized females revealed that loss of ovarian hormones exacerbates pulmonary inflammation and injury. However, eicosanoid and SPM production were not altered by ovariectomy despite depleted pulmonary DHA concentrations. Taken together, these data indicate that O3 drives an increased pulmonary inflammatory and bioactive lipid mediator response in females. Furthermore, ovariectomy increases susceptibility to O3-induced pulmonary inflammation and injury, as well as decreases pulmonary DHA concentrations.
臭氧(O3)是一种已知会增加心肺疾病发病率和死亡率的标准空气污染物。这种情况是通过肺部炎症反应发生的,其特征是免疫细胞向气道空间的募集增加、促炎细胞因子和促炎脂质介质。最近的证据表明,臭氧诱导的肺部炎症反应存在性别依赖性差异。然而,尚不清楚这种双态反应是否在肺部脂质介质代谢中表现出来。我们假设,在急性臭氧暴露后,脂质介质的产生存在性别依赖性差异。雄性和雌性 C57BL/6J 小鼠暴露于 1ppm 的臭氧中 3 小时,并在暴露后 6 或 24 小时进行尸检。收集肺灌洗液进行细胞差异和总蛋白分析,并收集肺组织进行 mRNA 分析、代谢脂质组学和免疫组织化学分析。与雄性相比,臭氧暴露的雌性小鼠的气道中性粒细胞增多、中性粒细胞趋化因子 mRNA 增加、促炎类二十烷酸(如前列腺素 E2)和专门的促解决介质(SPM)增加,如肺组织中的 resolvin D5。同样,与雄性相比,臭氧暴露后雌性肺组织中的前体脂肪酸(花生四烯酸和二十二碳六烯酸;DHA)增加。对卵巢切除术雌性的实验表明,卵巢激素的丧失会加剧肺部炎症和损伤。然而,尽管肺组织中 DHA 浓度降低,但卵巢切除术并未改变类二十烷酸和 SPM 的产生。总之,这些数据表明,臭氧会导致女性肺部炎症和生物活性脂质介质反应增加。此外,卵巢切除术会增加对臭氧诱导的肺部炎症和损伤的易感性,并降低肺组织中的 DHA 浓度。