臭氧暴露会导致人类无数的不良心肺结果。虽然高龄和慢性疾病是可能加剧一个人对臭氧暴露的负面反应的因素,没有易感性的分子生物标志物。这里,我们研究了表观遗传年龄加速(EAA)是否与对短期臭氧暴露的反应性相关.使用交叉控制暴露研究的数据(n=17),我们检查了EAA,在清洁空气暴露后24小时收集的肺上皮细胞中测量,改变了观察到的臭氧对自主神经功能的影响,心脏电生理学,止血,肺功能,和炎症。在从支气管肺泡灌洗液中提取的肺上皮细胞中评估EAA,使用泛组织老化时钟。我们使用了两种分析方法:(i)中位数回归来估计EAA与臭氧亚临床反应的估计风险差异之间的关联,以及(ii)块随机化方法来估计EAA对亚临床反应的影响修饰。对于这两种方法,我们计算了Fisher精确P值,允许我们绕过大样本量假设。在中位数回归分析中,加速表观遗传年龄改变了臭氧与心率校正QT间期(QTc)([公式:见正文]=0.12,P值=0.007)以及臭氧与C反应蛋白([公式:见正文]=-0.18,P=0.069)之间的关联.在块随机化期间,QTc和C反应蛋白的关联方向保持一致;然而,P值减弱。分组随机化还显示纤溶酶原激活物抑制剂-1(PAI-1)对臭氧暴露的响应性通过加速表观遗传老化而改变(加速老化定义的分组组之间的PAI-1差异=-0.54,P值=0.039)。总之,即使在年轻人中,EAA也是对臭氧暴露敏感性增加的个体的潜在生物标志物。健康的成年人。
Ozone exposure induces a myriad of adverse cardiopulmonary outcomes in humans. Although advanced age and chronic disease are factors that may exacerbate a person\'s negative response to ozone exposure, there are no molecular biomarkers of susceptibility. Here, we examine whether epigenetic age acceleration (EAA) is associated with responsiveness to short-term ozone exposure. Using data from a crossover-controlled exposure study (n = 17), we examined whether EAA, as measured in lung epithelial cells collected 24 h after clean air exposure, modifies the observed effect of ozone on autonomic function, cardiac electrophysiology, hemostasis, pulmonary function, and inflammation. EAA was assessed in lung epithelial cells extracted from bronchoalveolar lavage fluids, using the pan-tissue aging clock. We used two analytic approaches: (i) median regression to estimate the association between EAA and the estimated risk difference for subclinical responses to ozone and (ii) a block randomization approach to estimate EAA\'s effect modification of subclinical responses. For both approaches, we calculated Fisher-exact P-values, allowing us to bypass large sample size assumptions. In median regression analyses, accelerated epigenetic age modified associations between ozone and heart rate-corrected QT interval (QTc) ([Formula: see text]= 0.12, P-value = 0.007) and between ozone and C-reactive protein ([Formula: see text] = -0.18, P = 0.069). During block randomization, the directions of association remained consistent for QTc and C-reactive protein; however, the P-values weakened. Block randomization also revealed that responsiveness of plasminogen activator inhibitor-1 (PAI-1) to ozone exposure was modified by accelerated epigenetic aging (PAI-1 difference between accelerated aging-defined block groups = -0.54, P-value = 0.039). In conclusion, EAA is a potential biomarker for individuals with increased susceptibility to ozone exposure even among young, healthy adults.