Longitudinal Electronic Cigarette Exposures Impair Respiratory Function and Structure in the Female Apoe/- Mouse.

IF 3 2区 医学 Q2 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH
Héctor Millán Cotto, Yasmeen M Farra, Alexandra G Sorenson, Sanika Shingwekar, Ye Chen, Paola Sebastiani, Chiara Bellini, Jessica M Oakes
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引用次数: 0

Abstract

Introduction: Electronic cigarette (EC) usage amongst naïve users in the U.S. has been rising for the last decade. The effects of inhaling e-cig aerosols on respiratory health are not fully understood. The goal of this study was to longitudinally track changes in inflammation alongside abnormalities in lung structure and function following 8, 16, and 24 weeks of EC exposure.

Methods: Female Apoe-/- mice were nose-only exposed to either EC aerosols (JUULTM, 3% nicotine, tobacco flavored, 2 puffs/min, particle concentration of 300 mg/m3) or room air for 95 mins, 5 days/week, for 8, 16, or 24 weeks.

Results: Cytokines, measured from bronchioalveolar lavage fluid supernatant, were elevated at either 16 weeks of exposure (IL-4, IL-10, INF-α) or at the 16- and 24- week time point (IL-6, IL-17). Newtonian resistance, coefficient of respiratory elastance and resistances were larger in EC exposed, compared to air control mice, only at the 16-week time point. Mice at the 8-week and 16-week time point positively responded to methacholine, indicating hyper-reactive airways. Linear mean intercept (LM) was smaller in EC exposed mice, compared to controls, at the 8-week time point and larger at the 24-week time point. No change in LM was observed at the 16-week time point.

Conclusion: It is evident that EC aerosol inhalation caused pathological changes in the function respiratory system after 16 weeks of exposure. Evolution of structural changes including larger LM and increases in tissue thickness compensated each other, resulting in a return to functional normality at the 24-week time point.

Implications: Electronic cigarette use is on the rise, making it necessary to understand the long-term health implications of their use. This study provides the first assessment of structural and functional changes in the lung following prolonged exposure to electronic cigarettes. We find that 16 weeks, but not 8 weeks, of exposure leads to increases in resistances and tissue stiffness, due to an increase in cytoplasm and thickened alveolar septa. At 24 weeks, functional changes appear to reverse while structural abnormalities worsened. This study suggests that electronic cigarettes pose a significant health risk and regulation of them should be considered.

纵向电子烟暴露损害雌性Apoe/-小鼠的呼吸功能和结构。
简介:电子烟(EC)的使用在美国naïve用户中一直在上升,在过去的十年中。吸入电子烟气溶胶对呼吸系统健康的影响尚不完全清楚。本研究的目的是纵向追踪暴露于EC 8、16和24周后炎症变化以及肺结构和功能异常。方法:雌性Apoe-/-小鼠仅用鼻子暴露于EC气溶胶(JUULTM, 3%尼古丁,烟草味,2支/分钟,颗粒浓度为300 mg/m3)或室内空气中95分钟,5天/周,8、16或24周。结果:从细支气管肺泡灌洗液上清液中测定的细胞因子在暴露16周(IL-4、IL-10、INF-α)或16周和24周时间点(IL-6、IL-17)升高。仅在16周时间点,EC暴露小鼠的牛顿阻力、呼吸弹性系数和阻力均大于空气对照小鼠。小鼠在8周和16周的时间点对甲胆碱有积极反应,表明气道反应过度。与对照组相比,EC暴露小鼠在8周时间点的线性平均截距(LM)较小,在24周时间点的线性平均截距(LM)较大。16周时LM未见变化。结论:暴露16周后,EC气雾剂对大鼠的功能呼吸系统有明显的病理改变。结构变化的演变,包括更大的LM和组织厚度的增加,相互补偿,导致在24周的时间点功能恢复正常。影响:电子烟的使用正在上升,因此有必要了解其使用对健康的长期影响。这项研究首次评估了长期接触电子烟后肺部的结构和功能变化。我们发现,16周,而不是8周,暴露导致阻力和组织硬度增加,由于细胞质增加和肺泡间隔增厚。24周时,功能改变出现逆转,而结构异常恶化。这项研究表明,电子烟构成了重大的健康风险,应该考虑对其进行监管。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Nicotine & Tobacco Research
Nicotine & Tobacco Research 医学-公共卫生、环境卫生与职业卫生
CiteScore
8.10
自引率
10.60%
发文量
268
审稿时长
3-8 weeks
期刊介绍: Nicotine & Tobacco Research is one of the world''s few peer-reviewed journals devoted exclusively to the study of nicotine and tobacco. It aims to provide a forum for empirical findings, critical reviews, and conceptual papers on the many aspects of nicotine and tobacco, including research from the biobehavioral, neurobiological, molecular biologic, epidemiological, prevention, and treatment arenas. Along with manuscripts from each of the areas mentioned above, the editors encourage submissions that are integrative in nature and that cross traditional disciplinary boundaries. The journal is sponsored by the Society for Research on Nicotine and Tobacco (SRNT). It publishes twelve times a year.
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