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Nicotine Tob Res. 2016 May;18(5):613-9. doi: 10.1093/ntr/ntv169. Epub 2015 Aug 13.

Acute Exposure to Electronic and Combustible Cigarette Aerosols: Effects in an Animal Model and in Human Alveolar Cells.

Author information

1
Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, American University of Beirut, Beirut, Lebanon;
2
Department of Mechanical Engineering, American University of Beirut, Beirut, Lebanon; Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, VA;
3
Department of Anatomy, Cell Biology and Physiological Sciences, Faculty of Medicine, American University of Beirut, Beirut, Lebanon; me00@aub.edu.lb zaatari@aub.edu.lb.
4
Department of Pathology and Laboratory Medicine, American University of Beirut, Beirut, Lebanon me00@aub.edu.lb zaatari@aub.edu.lb.

Abstract

BACKGROUND:

Smoking electronic cigarettes (ECIG) is promoted as a safer alternative to smoking combustible cigarettes. This study investigates the effects of ECIG aerosol and cigarette smoke (CS) in an animal model and in human alveolar cell cultures (A549).

METHODS:

Mice were divided into Control, ECIG, and CS. Animals were exposed for 6h/d to either lab air, ECIG or CS, for of 3 days. Total particulate matter exposure for the ECIG was set at higher levels compared to CS. Lung injury was determined by: (1) measurement of wet-to-dry ratio; (2) albumin concentration in the bronchoalveolar lavage fluid; (3) transcriptional expression of inflammatory mediators IL-1β, IL-6, TNF-α; (4) oxidative stress; (5) assessment of cell death; and (6) lung histopathology. Human alveolar cell cultures were treated with various concentrations of ECIG and CS aerosol extracts and the effects on cell proliferation were evaluated.

RESULTS:

Wet-to-dry ratio was higher in CS when compared to ECIG. Albumin leak in bronchoalveolar lavage fluid was evident in CS but not in ECIG. ECIG exposure was only associated with a significant increase in IL-1β. In contrast, CS exposure resulted in significant increases in IL-1β, IL-6, TNF-α expression, and oxidative stress. TUNEL staining demonstrated significant cell death in CS but not in ECIG. At the cellular level, ECIG and CS extracts reduced cell proliferation, however, CS exhibited effects at lower concentrations.

CONCLUSION:

Despite higher exposure conditions, ECIG exhibited less toxic effects on lungs of experimental animals and on A549 cell cultures when compared to CS.

PMID:
26272212
PMCID:
PMC5942611
DOI:
10.1093/ntr/ntv169
[Indexed for MEDLINE]
Free PMC Article

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