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Harris T. Physical and Chemical Characterization of Aerosols Produced from Experimentally Designed Nicotine Salt-Based E-Liquids. Chem Res Toxicol 2024. [PMID: 39078024 DOI: 10.1021/acs.chemrestox.4c00073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/31/2024]
Abstract
Nicotine salt-based e-liquids deliver nicotine more rapidly and efficiently to electronic nicotine delivery system (ENDS) users than freebase nicotine formulations. Nicotine salt-based products represent a substantial majority of the United States ENDS market. Despite the popularity of nicotine salt formulations, the chemical and physical characteristics of aerosols produced by nicotine salt e-liquids are still not well understood. To address this, this study reports the harmful and potentially harmful constituents (HPHCs) and particle sizes of aerosols produced by laboratory-made freebase nicotine and nicotine salt e-liquids. The nicotine salt e-liquids were formulated with benzoic acid, citric acid, lactic acid, malic acid, or oxalic acid. The nicotine salt aerosols had different HPHC profiles than the freebase nicotine aerosols, indicating that the carboxylic acids were not innocent bystanders. The polycarboxylic acid e-liquids containing citric acid, malic acid, or oxalic acid produced higher acrolein yields than the monocarboxylic acid e-liquids containing benzoic acid or lactic acid. Across most PG:VG ratios, nicotine benzoate or nicotine lactate aerosols contained the highest nicotine quantities (in %) and the highest nicotine yields (per milligram of aerosol). Additionally, the nicotine benzoate and nicotine lactate e-liquids produced the highest carboxylic acid yields under all tested conditions. The lower acid yields of the citric, malic, and oxalic acid formulations are potentially due to a combination of factors such as lower transfer efficiencies, lower thermostabilities, and greater susceptibility to side reactions because of their additional carboxyl groups serving as new sites for reactivity. For all nicotine formulations, the particle size characteristics were primarily controlled by the e-liquid solvent ratios, and there were no clear trends between nicotine salt and freebase nicotine aerosols that indicated nicotine protonation affected particle size. The carboxylic acids impacted aerosol output, nicotine delivery, and HPHC yields in distinct ways such that interchanging them in ENDS can potentially cause downstream effects.
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Affiliation(s)
- Trevor Harris
- Office of Science, Center for Tobacco Products, U.S. Food and Drug Administration, Silver Spring, Maryland 20993, United States
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2
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Nazneen, Patra AK, Kolluru SSR, Penchala A, Kumar S, Mishra N, Sree NB, Santra S, Dubey R. Assessment of seasonal variability of PM, BC and UFP levels at a highway toll stations and their associated health risks. ENVIRONMENTAL RESEARCH 2024; 245:118028. [PMID: 38160974 DOI: 10.1016/j.envres.2023.118028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/15/2023] [Accepted: 12/22/2023] [Indexed: 01/03/2024]
Abstract
As a part of their occupation, workers at toll stations are exposed to traffic emissions during the working shift, which sometimes stretches to 12 h. To assess the exposure and subsequent health risk of these workers, a study was performed on a highway toll station in India. PM1, PM2.5, PM10, BC and UFP concentration were determined inside a toll collectors' cabin and outside in a free-flowing traffic section (125 m from the toll cabin). The concentrations varied in the following range: PM1 (40.69-226.13 μg m-3), PM2.5 (49.71-247.36 μg m-3), PM10 (83.15-458.14 μg m-3) and BC (2.1-87.5 μg m-3) and UFP: 101-53705 pt cm-3. The mean concentration inside the cabin was 1.34 (PM1), 1.35 (PM2.5), 1.16 (PM10) and 2.91 (BC) times the concentration outside for the summer season. The corresponding levels in the winter season were 1.14 (PM1), 1.11 (PM2.5), 1.11 (PM10), 2.50 (BC) and 1.82 (UFP). In addition to the exhaust emission, the non-exhaust emissions such as resuspension of crustal particles, fly ash and bioaerosols were identified. Using the Multiple Path Particle Dosimetry model for two groups - adults (18-21 years) and adults (21+ years), it was estimated that the pulmonary deposition of in-cabin workers were 50% (PM2.5) -75% (PM1) higher than the workers outside the cabin. Particle mass deposition was found to be higher for adults (21+ years) than adults (18-21 years) for both the seasons. The study quantitatively assessed the health risk faced by the workers in terms of exposure concentration and deposition in respiratory tract. More such studies at different traffic mix and climate can provide better estimates of health risk of toll workers that can be used to devise appropriate strategies for control of it.
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Affiliation(s)
- Nazneen
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, India
| | - Aditya Kumar Patra
- Department of Mining Engineering, Indian Institute of Technology Kharagpur, India.
| | - Soma Sekhara Rao Kolluru
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, India
| | - Abhishek Penchala
- Department of Mining Engineering, Indian Institute of Technology Kharagpur, India
| | - Sachidanand Kumar
- Department of Mining Engineering, Indian Institute of Technology Kharagpur, India
| | - Namrata Mishra
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, India
| | - Naragam Bhanu Sree
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, India
| | - Samrat Santra
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, India
| | - Ravish Dubey
- Yale School of Environment, Yale University, USA
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3
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Herbert J, Kelty JS, Laskin JD, Laskin DL, Gow AJ. Menthol flavoring in e-cigarette condensate causes pulmonary dysfunction and cytotoxicity in precision cut lung slices. Am J Physiol Lung Cell Mol Physiol 2023; 324:L345-L357. [PMID: 36692165 PMCID: PMC10026991 DOI: 10.1152/ajplung.00222.2022] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 01/05/2023] [Accepted: 01/14/2023] [Indexed: 01/25/2023] Open
Abstract
E-cigarette consumption is under scrutiny by regulatory authorities due to concerns about product toxicity, lack of manufacturing standards, and increasing reports of e-cigarette- or vaping-associated acute lung injury. In vitro studies have demonstrated cytotoxicity, mitochondrial dysfunction, and oxidative stress induced by unflavored e-cigarette aerosols and flavoring additives. However, e-cigarette effects on the complex lung parenchyma remain unclear. Herein, the impact of e-cigarette condensates with or without menthol flavoring on functional, structural, and cellular responses was investigated using mouse precision cut lung slices (PCLS). PCLS were exposed to e-cigarette condensates prepared from aerosolized vehicle, nicotine, nicotine + menthol, and menthol e-fluids at doses from 50 to 500 mM. Doses were normalized to the glycerin content of vehicle. Video-microscopy of PCLS revealed impaired contractile responsiveness of airways to methacholine and dampened ciliary beating following exposure to menthol-containing condensates at concentrations greater than 300 mM. Following 500 mM menthol-containing condensate exposure, epithelial exfoliation in intrabronchial airways was identified in histological sections of PCLS. Measurement of lactate dehydrogenase release, mitochondrial water-soluble-tetrazolium salt-1 conversion, and glutathione content supported earlier findings of nicotine or nicotine + menthol e-cigarette-induced dose-dependent cytotoxicity and oxidative stress responses. Evaluation of PCLS metabolic activity revealed dose-related impairment of mitochondrial oxidative phosphorylation and glycolysis after exposure to menthol-containing condensates. Taken together, these data demonstrate prominent menthol-induced pulmonary toxicity and impairment of essential physiological functions in the lung, which warrants concerns about e-cigarette consumer safety and emphasizes the need for further investigations of molecular mechanisms of toxicity and menthol effects in an experimental model of disease.
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Affiliation(s)
- Julia Herbert
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, United States
| | - Jacklyn S Kelty
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, United States
| | - Jeffrey D Laskin
- Department of Environmental and Occupational Health and Justice, School of Public Health, Rutgers University, Piscataway, New Jersey, United States
| | - Debra L Laskin
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, United States
| | - Andrew J Gow
- Department of Pharmacology and Toxicology, Ernest Mario School of Pharmacy, Rutgers University, Piscataway, New Jersey, United States
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4
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Park B, Koh H, Patatanian M, Reyes-Caballero H, Zhao N, Meinert J, Holbrook JT, Leinbach LI, Biswal S. The mediating roles of the oral microbiome in saliva and subgingival sites between e-cigarette smoking and gingival inflammation. BMC Microbiol 2023; 23:35. [PMID: 36732713 PMCID: PMC9893987 DOI: 10.1186/s12866-023-02779-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Accepted: 01/19/2023] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Electronic cigarettes (ECs) have been widely used by young individuals in the U.S. while being considered less harmful than conventional tobacco cigarettes. However, ECs have increasingly been regarded as a health risk, producing detrimental chemicals that may cause, combined with poor oral hygiene, substantial inflammation in gingival and subgingival sites. In this paper, we first report that EC smoking significantly increases the odds of gingival inflammation. Then, through mediation analysis, we seek to identify and explain the mechanism that underlies the relationship between EC smoking and gingival inflammation via the oral microbiome. METHODS We collected saliva and subgingival samples from 75 EC users and 75 non-users between 18 and 34 years in age and profiled their microbial compositions via 16S rRNA amplicon sequencing. We conducted raw sequence data processing, denoising and taxonomic annotations using QIIME2 based on the expanded human oral microbiome database (eHOMD). We then created functional annotations (i.e., KEGG pathways) using PICRUSt2. RESULTS We found significant increases in α-diversity for EC users and disparities in β-diversity between EC users and non-users. We also found significant disparities between EC users and non-users in the relative abundance of 36 microbial taxa in the saliva site and 71 microbial taxa in the subgingival site. Finally, we found that 1 microbial taxon in the saliva site and 18 microbial taxa in the subgingival site significantly mediated the effects of EC smoking on gingival inflammation. The mediators on the genus level, for example, include Actinomyces, Rothia, Neisseria, and Enterococcus in the subgingival site. In addition, we report significant disparities between EC users and non-users in the relative abundance of 71 KEGG pathways in the subgingival site. CONCLUSIONS These findings reveal that continued EC use can further increase microbial dysbiosis that may lead to periodontal disease. Our findings also suggest that continued surveillance for the effect of ECs on the oral microbiome and its transmission to oral diseases is needed.
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Affiliation(s)
- Bongsoo Park
- Department of Environmental Health and Engineering, Johns Hopkins School of Public Health, 615 N Wolfe St, Baltimore, MD, 21205, USA
- Epigenetics and Stem Cell Aging, Translational Gerontology Branch, National Institute On Aging, National Institute of Health, Baltimore, MD, 21224, USA
| | - Hyunwook Koh
- Department of Applied Mathematics and Statistics, The State University of New York, Korea, Incheon, 21985, South Korea
| | - Michael Patatanian
- Department of Environmental Health and Engineering, Johns Hopkins School of Public Health, 615 N Wolfe St, Baltimore, MD, 21205, USA
| | - Hermes Reyes-Caballero
- Department of Environmental Health and Engineering, Johns Hopkins School of Public Health, 615 N Wolfe St, Baltimore, MD, 21205, USA
| | - Ni Zhao
- Department of Biostatistics, Johns Hopkins School of Public Health, Baltimore, MD, 21205, USA
| | - Jill Meinert
- Department of Epidemiology, Johns Hopkins School of Public Health, Baltimore, MD, 21205, USA
| | - Janet T Holbrook
- Department of Epidemiology, Johns Hopkins School of Public Health, Baltimore, MD, 21205, USA
| | - Leah I Leinbach
- Department of Health Policy and Management, Johns Hopkins School of Public Health, Baltimore, MD, 21205, USA
- Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA
| | - Shyam Biswal
- Department of Environmental Health and Engineering, Johns Hopkins School of Public Health, 615 N Wolfe St, Baltimore, MD, 21205, USA.
- Johns Hopkins School of Medicine, Baltimore, MD, 21205, USA.
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5
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Zhang Q, Jeon J, Goldsmith T, Black M, Greenwald R, Wright C. Characterization of an Electronic Nicotine Delivery System (ENDS) Aerosol Generation Platform to Determine Exposure Risks. TOXICS 2023; 11:99. [PMID: 36850974 PMCID: PMC9967066 DOI: 10.3390/toxics11020099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 01/13/2023] [Accepted: 01/18/2023] [Indexed: 06/18/2023]
Abstract
Evaluating vaping parameters that influence electronic nicotine delivery system (ENDS) emission profiles and potentially hazardous exposure levels is essential to protecting human health. We developed an automated multi-channel ENDS aerosol generation system (EAGS) for characterizing size-resolved particle emissions across pod- and mod-type devices using real-time monitoring instruments, an exposure chamber, and vaping parameters including different ventilation rates, device type and age, e-liquid formulation, and atomizer setup. Results show the ENDS device type, e-liquid flavoring, and nicotine content can affect particle emissions. In general, pod-type devices have unimodal particle size distributions and higher number emissions, while mod-type devices have bimodal size distributions and higher mass emissions. For pod-type devices, later puff fractions emit lower aerosols, which is potentially associated with the change of coil resistance and power during ageing. For a mod-type device, an atomizer with a lower resistance coil and higher power generates larger particle emissions than an atomizer with a greater resistance coil and lower power. The unventilated scenario produces higher particle emission factors, except for particle mass emission from pod-type devices. The data provided herein indicate the EAGS can produce realistic and reproducible puff profiles of pod- and mod-type ENDS devices and therefore is a suitable platform for characterizing ENDS-associated exposure risks.
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Affiliation(s)
- Qian Zhang
- Chemical Insights Research Institute, UL Research Institutes, Marietta, GA 30067, USA
| | - Jennifer Jeon
- Chemical Insights Research Institute, UL Research Institutes, Marietta, GA 30067, USA
| | - Travis Goldsmith
- Department of Physiology and Pharmacology, West Virginia University/IEStechno, Morgantown, WV 26505, USA
| | - Marilyn Black
- Chemical Insights Research Institute, UL Research Institutes, Marietta, GA 30067, USA
| | - Roby Greenwald
- School of Public Health, Georgia State University, Atlanta, GA 30303, USA
| | - Christa Wright
- Chemical Insights Research Institute, UL Research Institutes, Marietta, GA 30067, USA
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6
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Dai W, Shi J, Siddarth P, Zhao L, Carreno J, Kleinman MT, Herman DA, Arechavala RJ, Renusch S, Hasen I, Ting A, Kloner RA. Effects of Electronic Cigarette Exposure on Myocardial Infarction and No-Reflow, and Cardiac Function in a Rat Model. J Cardiovasc Pharmacol Ther 2023; 28:10742484231155992. [PMID: 36799436 DOI: 10.1177/10742484231155992] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
PURPOSE We investigated the effects of exposure to electronic cigarettes (E-cig) vapor on the sizes of the no-reflow and myocardial infarction regions, and cardiovascular function compared to exposure to purified air and standard cigarette smoke. METHODS AND RESULTS Sprague Dawley rats (both male and female, 6 weeks old) were successfully exposed to filtered air (n = 32), E-cig with nicotine (E-cig Nic+, n = 26), E-cig without nicotine (E-cig Nic-, n = 26), or standard cigarette smoke (1R6F reference, n = 31). All rats were exposed to inhalation exposure for 8 weeks, prior to being subjected to 30 minutes of left coronary artery occlusion followed by 3 hours of reperfusion. Exposure to E-cig vapor with or without nicotine or exposure to standard cigarettes did not increase myocardial infarct size or worsen the no-reflow phenomenon. Exposure to E-cig Nic+ reduced the body weight gain, and increased the LV weight normalized to body weight and LV wall thickness and enhanced the collagen deposition within the LV wall. E-cig exposure led to cardiovascular dysfunction, such as reductions in cardiac output, LV positive and negative dp/dt, suggesting a reduction in contractility and relaxation, and increased systemic arterial resistance after coronary artery occlusion and reperfusion in rats compared to air or cigarette exposure. CONCLUSIONS E-cig exposure did not increase myocardial infarct size or worsen the no-reflow phenomenon, but induced deleterious changes in LV structure leading to cardiovascular dysfunction and increased systemic arterial resistance after coronary artery occlusion followed by reperfusion.
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Affiliation(s)
- Wangde Dai
- HMRI Cardiovascular Research Institute, Huntington Medical Research Institutes, Pasadena, CA, USA.,Division of Cardiovascular Medicine of the Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Jianru Shi
- HMRI Cardiovascular Research Institute, Huntington Medical Research Institutes, Pasadena, CA, USA.,Division of Cardiovascular Medicine of the Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
| | - Prabha Siddarth
- Department of Psychiatry, Jane and Terry Semel Institute for Neuroscience and Human Behavior, University of California, Los Angeles, CA, USA
| | - Lifu Zhao
- HMRI Cardiovascular Research Institute, Huntington Medical Research Institutes, Pasadena, CA, USA
| | - Juan Carreno
- HMRI Cardiovascular Research Institute, Huntington Medical Research Institutes, Pasadena, CA, USA
| | - Michael T Kleinman
- Department of Environmental and Occupational Health, College of Health Sciences, University of California, Irvine, CA, USA
| | - David A Herman
- Department of Environmental and Occupational Health, College of Health Sciences, University of California, Irvine, CA, USA
| | - Rebecca J Arechavala
- Department of Environmental and Occupational Health, College of Health Sciences, University of California, Irvine, CA, USA
| | - Samantha Renusch
- Department of Environmental and Occupational Health, College of Health Sciences, University of California, Irvine, CA, USA
| | - Irene Hasen
- Department of Environmental and Occupational Health, College of Health Sciences, University of California, Irvine, CA, USA
| | - Amanda Ting
- Department of Environmental and Occupational Health, College of Health Sciences, University of California, Irvine, CA, USA
| | - Robert A Kloner
- HMRI Cardiovascular Research Institute, Huntington Medical Research Institutes, Pasadena, CA, USA.,Division of Cardiovascular Medicine of the Keck School of Medicine, University of Southern California, Los Angeles, CA, USA
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7
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Dibaji SAR, Oktem B, Williamson L, DuMond J, Cecil T, Kim JP, Wickramasekara S, Myers M, Guha S. Characterization of aerosols generated by high-power electronic nicotine delivery systems (ENDS): Influence of atomizer, temperature and PG:VG ratios. PLoS One 2022; 17:e0279309. [PMID: 36538548 PMCID: PMC9767331 DOI: 10.1371/journal.pone.0279309] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 11/28/2022] [Indexed: 12/24/2022] Open
Abstract
The aerosol characteristics of electronic nicotine delivery systems (ENDS) are important parameters in predicting health outcomes since parameters such as aerosol particle size correlate strongly to aerosol delivery and deposition efficiency. However, many studies to date do not account for aerosol aging, which may affect the measurement of ultra-fine particles that typically coagulate or agglomerate during puff development. To reduce aerosol aging, we herein present a unique instrumentation method that combines a) positive pressure ENDS activation and sample collection, b) minimization of both sample tubing length and dilution factors, and c) a high-resolution, electrical low-pressure impactor. This novel approach was applied to systematically investigate the effects of coil design, coil temperature, and propylene glycol to vegetable glycerol ratios on aerosol characteristics including aerosol mass generation, aerosol count generation, and the mass and count size distributions for a high-powered ENDS. Aerosol count measurements revealed high concentrations of ultra-fine particles compared to fine and coarse particles at 200°C, while aerosol mass measurements showed an increase in the overall aerosol mass of fine and coarse particles with increases in temperature and decreases in propylene glycol content. These results provide a better understanding on how various ENDS design parameters affect aerosol characteristics and highlight the need for further research to identify the design parameters that most impact ultra-fine particle generation.
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Affiliation(s)
| | - Berk Oktem
- Office of Science and Engineering Laboratories, Silver Spring, MD, United States of America
| | - Lee Williamson
- Center for Tobacco Products, Office of Science, Silver Spring, MD, United States of America
| | - Jenna DuMond
- Center for Tobacco Products, Office of Science, Silver Spring, MD, United States of America
| | - Todd Cecil
- Center for Tobacco Products, Office of Science, Silver Spring, MD, United States of America
| | - Jimin P. Kim
- Center for Tobacco Products, Office of Science, Silver Spring, MD, United States of America
| | | | - Matthew Myers
- Office of Science and Engineering Laboratories, Silver Spring, MD, United States of America
| | - Suvajyoti Guha
- Office of Science and Engineering Laboratories, Silver Spring, MD, United States of America
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8
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Novelli CE, Higginbotham EJ, Kapanke KA, Webber-Ritchey KJ, Parker CH, Simonovich SD. A systematic review examining the pulmonary effects of electronic vapor delivery systems. J Clin Anesth 2022; 82:110952. [PMID: 36007478 DOI: 10.1016/j.jclinane.2022.110952] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 07/28/2022] [Accepted: 08/09/2022] [Indexed: 10/31/2022]
Abstract
STUDY OBJECTIVE Despite the popularity of vaping and electronic vapor delivery systems (EVDS), the healthcare community remains largely unfamiliar with their potential to induce harm. The purpose of this systematic review is to identify how EVDS use affects the pulmonary system in order to support future anesthetic guidelines for patients who vape. DESIGN Systematic Review. An electronic search of databases CINAHL and PubMed was performed in October 2020. STUDY ELIGIBILITY CRITERIA Studies were included if they were deemed original research published in English, if they were performed exclusively in humans or on human tissue, if they examined the effects of EVDS on pulmonary function or tissue, and/or if they produced quantitative data. Studies were excluded if they utilized animal samples, studied subjects under the age of 18, presented expert opinions or reviews, offered qualitative data, reported case studies, or only evaluated EVDS' efficacy as a smoking cessation tool. MAIN RESULTS This review identified six EVDS-induced pulmonary implications warranting anesthetic consideration: alterations in pulmonary function tests, disrupted ventilation, impaired mucociliary clearance, tissue destruction, a disrupted immune response, and oxidative stress with DNA fragmentation. CONCLUSION A total of 38 studies described the effects of EVDS on pulmonary function, airway epithelial tissue, and inflammatory mechanisms that may lead to chronic pulmonary disease. Anesthesia providers are encouraged to assess patients for EVDS use during the preoperative period and use the information generated by this systematic review to drive subsequent care.
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Affiliation(s)
- Corinne E Novelli
- University of Chicago Medical Center, Chicago, IL, United States of America
| | | | - Karen A Kapanke
- Northshore University HealthSystem School of Nurse Anesthesia, Evanston, IL, United States of America.
| | - Kashica J Webber-Ritchey
- School of Nursing, College of Science and Health, DePaul University, 990 W Fullerton, Chicago, IL, United States of America.
| | - Christopher H Parker
- DePaul University Libraries, 2350 N Kenmore Ave, Chicago, IL 60614, United States of America.
| | - Shannon D Simonovich
- School of Nursing, College of Science and Health, DePaul University, 990 W Fullerton, Chicago, IL, United States of America.
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9
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Wick KD, Fang X, Maishan M, Matsumoto S, Spottiswoode N, Sarma A, Simoneau C, Khakoo M, Langelier C, Calfee CS, Gotts JE, Matthay MA. Impact of e-cigarette aerosol on primary human alveolar epithelial type 2 cells. Am J Physiol Lung Cell Mol Physiol 2022; 323:L152-L164. [PMID: 35670478 PMCID: PMC9559034 DOI: 10.1152/ajplung.00503.2021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 05/03/2022] [Accepted: 06/01/2022] [Indexed: 11/22/2022] Open
Abstract
Electronic cigarettes (e-cigarettes) are designed to simulate combustible cigarette smoking and to aid in smoking cessation. Although the number of e-cigarette users has been increasing, the potential health impacts and biological effects of e-cigarettes are still not fully understood. Previous research has focused on the biological effects of e-cigarettes on lung cancer cell lines and distal airway epithelial cells; however, there have been few published studies on the effect of e-cigarettes on primary lung alveolar epithelial cells. The primary purpose of this study was to investigate the direct effect of e-cigarette aerosol on primary human lung alveolar epithelial type 2 (AT2) cells, both alone and in the presence of viral infection. The Melo-3 atomizer caused direct AT2 cell toxicity, whereas the more popular Juul pod's aerosol did not have a detectable cytotoxic effect on AT2 cells. Juul nicotine aerosol also did not increase short-term susceptibility to viral infection. However, 3 days of exposure upregulated genes central to the generation of reactive oxygen species, lipid peroxidation, and carcinogen metabolism and downregulated key innate immune system genes related to cytokine and chemokine signaling. These findings have implications for the potentially injurious impact of long-term use of popular low-power e-cigarette pods on the human alveolar epithelium. Gene expression data might be an important endpoint for evaluating the potential harmful effects of vaping devices that do not cause overt toxicity.
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Affiliation(s)
- Katherine D Wick
- Cardiovascular Research Institute, University of California, San Francisco, California
| | - Xiaohui Fang
- Cardiovascular Research Institute, University of California, San Francisco, California
| | - Mazharul Maishan
- Cardiovascular Research Institute, University of California, San Francisco, California
| | - Shotaro Matsumoto
- Cardiovascular Research Institute, University of California, San Francisco, California
| | - Natasha Spottiswoode
- Division of Infectious Diseases, Department of Medicine, University of California, San Francisco, California
| | - Aartik Sarma
- Division of Pulmonary and Critical Care, Department of Medicine, University of California, San Francisco, California
| | - Camille Simoneau
- Gladstone Institutes, University of California, San Francisco, California
| | - Manisha Khakoo
- Cardiovascular Research Institute, University of California, San Francisco, California
| | - Chaz Langelier
- Division of Infectious Diseases, Department of Medicine, University of California, San Francisco, California
- Chan Zuckerberg Biohub, San Francisco, California
| | - Carolyn S Calfee
- Cardiovascular Research Institute, University of California, San Francisco, California
- Division of Pulmonary and Critical Care, Department of Medicine, University of California, San Francisco, California
| | - Jeffrey E Gotts
- Cardiovascular Research Institute, University of California, San Francisco, California
| | - Michael A Matthay
- Cardiovascular Research Institute, University of California, San Francisco, California
- Department of Medicine, University of California, San Francisco, California
- Department of Anesthesia, University of California, San Francisco, California
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10
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Abstract
Widespread uptake of vaping has signaled a sea change in the future of nicotine consumption. Vaping has grown in popularity over the past decade, in part propelled by innovations in vape pen design and nicotine flavoring. Teens and young adults have seen the biggest uptake in use of vape pens, which have superseded conventional cigarettes as the preferred modality of nicotine consumption. Relatively little is known, however, about the potential effects of chronic vaping on the respiratory system. Further, the role of vaping as a tool of smoking cessation and tobacco harm reduction remains controversial. The 2019 E-cigarette or Vaping Use-Associated Lung Injury (EVALI) outbreak highlighted the potential harms of vaping, and the consequences of long term use remain unknown. Here, we review the growing body of literature investigating the impacts of vaping on respiratory health. We review the clinical manifestations of vaping related lung injury, including the EVALI outbreak, as well as the effects of chronic vaping on respiratory health and covid-19 outcomes. We conclude that vaping is not without risk, and that further investigation is required to establish clear public policy guidance and regulation.
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Affiliation(s)
- Andrea Jonas
- Division of Pulmonary, Allergy, and Critical Care, Department of Medicine, Stanford University, Stanford, CA, USA
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11
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Xu L, Yang Y, Simien JM, Kang C, Li G, Xu X, Haglund E, Sun R, Zuo YY. Menthol in Electronic Cigarettes Causes Biophysical Inhibition of Pulmonary Surfactant. Am J Physiol Lung Cell Mol Physiol 2022; 323:L165-L177. [PMID: 35762601 DOI: 10.1152/ajplung.00015.2022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
With an increasing prevalence of electronic cigarette (e-cigarette) use, especially among youth, there is an urgent need to better understand the biological risks and pathophysiology of health conditions related to e-cigarettes. A majority of e-cigarette aerosols are in the submicron size and would deposit in the alveolar region of the lung, where they must first interact with the endogenous pulmonary surfactant. To date, little is known whether e-cigarette aerosols have an adverse impact on the pulmonary surfactant. We have systematically studied the effect of individual e-cigarette ingredients on an animal-derived clinical surfactant preparation, bovine lipid extract surfactant, using a combination of biophysical and analytical techniques, including in vitro biophysical simulations using constrained drop surfactometry, molecular imaging with atomic force microscopy, chemical assays using carbon nuclear magnetic resonance and circular dichroism, and in silico molecular dynamics simulations. All data collectively suggest that flavorings used in e-cigarettes, especially menthol, play a predominant role in inhibiting the biophysical function of the surfactant. The mechanism of biophysical inhibition appears to involve menthol interactions with both phospholipids and hydrophobic proteins of the natural surfactant. These results provide novel insights into the understanding of the health impact of e-cigarettes and may contribute to a better regulation of e-cigarette products.
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Affiliation(s)
- Lu Xu
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States
| | - Yi Yang
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States
| | | | - Christopher Kang
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, HI, United States
| | - Guangle Li
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States
| | - Xiaojie Xu
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States
| | - Ellinor Haglund
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, HI, United States
| | - Rui Sun
- Department of Chemistry, University of Hawaii at Manoa, Honolulu, HI, United States
| | - Yi Y Zuo
- Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, Hawaii, United States.,Department of Pediatrics, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI, United States
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12
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Moshensky A, Brand CS, Alhaddad H, Shin J, Masso-Silva JA, Advani I, Gunge D, Sharma A, Mehta S, Jahan A, Nilaad S, Olay J, Gu W, Simonson T, Almarghalani D, Pham J, Perera S, Park K, Al-Kolla R, Moon H, Das S, Byun MK, Shah Z, Sari Y, Heller Brown J, Crotty Alexander LE. Effects of mango and mint pod-based e-cigarette aerosol inhalation on inflammatory states of the brain, lung, heart, and colon in mice. eLife 2022; 11:e67621. [PMID: 35411847 PMCID: PMC9005188 DOI: 10.7554/elife.67621] [Citation(s) in RCA: 23] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 03/04/2022] [Indexed: 12/13/2022] Open
Abstract
While health effects of conventional tobacco are well defined, data on vaping devices, including one of the most popular e-cigarettes which have high nicotine levels, are less established. Prior acute e-cigarette studies have demonstrated inflammatory and cardiopulmonary physiology changes while chronic studies have demonstrated extra-pulmonary effects, including neurotransmitter alterations in reward pathways. In this study we investigated the impact of inhalation of aerosols produced from pod-based, flavored e-cigarettes (JUUL) aerosols three times daily for 3 months on inflammatory markers in the brain, lung, heart, and colon. JUUL aerosol exposure induced upregulation of cytokine and chemokine gene expression and increased HMGB1 and RAGE in the nucleus accumbens in the central nervous system. Inflammatory gene expression increased in the colon, while gene expression was more broadly altered by e-cigarette aerosol inhalation in the lung. Cardiopulmonary inflammatory responses to acute lung injury with lipopolysaccharide were exacerbated in the heart. Flavor-specific findings were detected across these studies. Our findings suggest that daily e-cigarette use may cause neuroinflammation, which may contribute to behavioral changes and mood disorders. In addition, e-cigarette use may cause gut inflammation, which has been tied to poor systemic health, and cardiac inflammation, which leads to cardiovascular disease.
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Affiliation(s)
- Alex Moshensky
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Cameron S Brand
- Department of Pharmacology, University of California San Diego (UCSD)San DiegoUnited States
| | - Hasan Alhaddad
- Department of Pharmacology and Experimental Therapeutics, College of Pharmacy and Pharmaceutical Sciences, University of ToledoToledoUnited States
| | - John Shin
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Jorge A Masso-Silva
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Ira Advani
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Deepti Gunge
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Aditi Sharma
- Department of Pathology, University of California San Diego (UCSD)San DiegoUnited States
| | - Sagar Mehta
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Arya Jahan
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Sedtavut Nilaad
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Jarod Olay
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Wanjun Gu
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Tatum Simonson
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Daniyah Almarghalani
- Department of Pharmacology and Experimental Therapeutics, College of Pharmacy and Pharmaceutical Sciences, University of ToledoToledoUnited States
| | - Josephine Pham
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Samantha Perera
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Kenneth Park
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Rita Al-Kolla
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
| | - Hoyoung Moon
- Department of Pharmacology, University of California San Diego (UCSD)San DiegoUnited States
| | - Soumita Das
- Department of Pathology, University of California San Diego (UCSD)San DiegoUnited States
| | - Min Kwang Byun
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
- Division of Pulmonology, Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of MedicineSeoulRepublic of Korea
| | - Zahoor Shah
- Department of Medicinal and Biological Chemistry, College of Pharmacy and Pharmaceutical Sciences, University of ToledoToledoUnited States
| | - Youssef Sari
- Department of Pharmacology and Experimental Therapeutics, College of Pharmacy and Pharmaceutical Sciences, University of ToledoToledoUnited States
| | - Joan Heller Brown
- Department of Pharmacology, University of California San Diego (UCSD)San DiegoUnited States
| | - Laura E Crotty Alexander
- Pulmonary and Critical Care Section, VA San Diego Healthcare SystemLa JollaUnited States
- Division of Pulmonary, Critical Care and Sleep Medicine and Section of Physiology, Department of Medicine, University of California San Diego (UCSD)San DiegoUnited States
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13
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Stefaniak AB, Ranpara AC, Virji MA, LeBouf RF. Influence of E-Liquid Humectants, Nicotine, and Flavorings on Aerosol Particle Size Distribution and Implications for Modeling Respiratory Deposition. Front Public Health 2022; 10:782068. [PMID: 35372219 PMCID: PMC8968757 DOI: 10.3389/fpubh.2022.782068] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 02/15/2022] [Indexed: 01/10/2023] Open
Abstract
Electronic cigarette, or vaping, products are used to heat an e-liquid to form an aerosol (liquid droplets suspended in gas) that the user inhales; a portion of this aerosol deposits in their respiratory tract and the remainder is exhaled, thereby potentially creating opportunity for secondhand exposure to bystanders (e.g., in homes, automobiles, and workplaces). Particle size, a critical factor in respiratory deposition (and therefore potential for secondhand exposure), could be influenced by e-liquid composition. Hence, the purposes of this study were to (1) test the influence of laboratory-prepared e-liquid composition [ratio of propylene glycol (PG) to vegetable glycerin (VG) humectants, nicotine, and flavorings] on particle size distribution and (2) model respiratory dosimetry. All e-liquids were aerosolized using a second-generation reference e-cigarette. We measured particle size distribution based on mass using a low-flow cascade impactor (LFCI) and size distribution based on number using real-time mobility sizers. Mass median aerodynamic diameters (MMADs) of aerosol from e-liquids that contained only humectants were significantly larger compared with e-liquids that contained flavorings or nicotine (p = 0.005). Humectant ratio significantly influenced MMADs; all aerosols from e-liquids prepared with 70:30 PG:VG were significantly larger compared with e-liquids prepared with 30:70 PG:VG (p = 0.017). In contrast to the LFCI approach, the high dilution and sampling flow rate of a fast mobility particle sizer strongly influenced particle size measurements (i.e., all calculated MMAD values were < 75 nm). Dosimetry modeling using LFCI data indicated that a portion of inhaled particles will deposit throughout the respiratory tract, though statistical differences in aerosol MMADs among e-liquid formulations did not translate into large differences in deposition estimates. A portion of inhaled aerosol will be exhaled and could be a source for secondhand exposure. Use of laboratory-prepared e-liquids and a reference e-cigarette to standardize aerosol generation and a LFCI to measure particle size distribution without dilution represents an improved method to characterize physical properties of volatile aerosol particles and permitted determination of MMAD values more representative of e-cigarette aerosol in situ, which in turn, can help to improve dose modeling for users and bystanders.
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14
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Kopsombut G, Ajjegowda A, Livingston F, Epelman M, Brown B, Werk L, Brogan R. Clinical Findings in Adolescents Hospitalized With EVALI; Novel Report on Coagulopathy. Hosp Pediatr 2022; 12:229-240. [PMID: 35098298 DOI: 10.1542/hpeds.2021-006059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
OBJECTIVES Describe clinical characteristics of adolescents hospitalized with e-cigarette or vaping product use-associated lung injury (EVALI) and to investigate association between EVALI and coagulopathy. METHODS We conducted a retrospective cohort study of adolescents admitted to the general inpatient or ICUs at 2 major tertiary children's hospitals from January 2019 to June 2021. We included analysis of demographics, clinical findings, laboratory and imaging results, and outcomes. RESULTS Forty-four hospitalizations met diagnostic criteria for inclusion per Centers for Disease Control and Prevention guidelines, with 55% of patients admitted after April 2020. Compared with adults, pediatric patients were less likely to present with pulmonary symptoms. Significant laboratory work included elevated white blood cell count of 14.3 k/uL (confidence interval [CI], 13.7-15.0) with neutrophilic predominance, C-reactive protein of 25.2 mg/dL (CI, 22.1-28.2), and erythrocyte sedimentation rate of 66.7 mm/hour (CI, 26.9-76.4). Chest radiographs were poor predictors of disease in 53% of our patients but computed tomography was 100% sensitive. Significant coagulation abnormalities included prothrombin time of 17.7 seconds (CI, 16.4-19.1) and international normalized ratio of 1.54 (CI, 1.43-1.66). Coagulation studies improved with vitamin K and steroid administration. Nine of 16 patients (56%) had abnormal diffusing capacity of the lung for carbon monoxide divided by alveolar volume <80% predicted, suggesting evidence of pulmonary vascular disease, or >100%, suggesting pulmonary hemorrhage. CONCLUSIONS EVALI continues to be an important differential diagnosis in the adolescent population. EVALI is likely a result of systemic inflammation with consequences beyond the pulmonary system. The novel report of coagulopathy among adolescents with EVALI in this cohort reveals an opportunity to detect coagulopathy and initiate early therapy.
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Affiliation(s)
| | | | | | | | | | - Lloyd Werk
- General Academic Pediatrics, Nemours Children's Hospital, Orlando, Florida
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15
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Palazzolo DL, Caudill J, Baron J, Cooper K. Fabrication and Validation of an Economical, Programmable, Dual-Channel, Electronic Cigarette Aerosol Generator. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182413190. [PMID: 34948804 PMCID: PMC8703563 DOI: 10.3390/ijerph182413190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/06/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022]
Abstract
Vaping (inhalation of electronic cigarette-generated aerosol) is a public health concern. Due to recent spikes in adolescent use of electronic cigarettes (ECIGs) and vaping-induced illnesses, demand for scientific inquiry into the physiological effects of electronic cigarette (ECIG) aerosol has increased. For such studies, standardized and consistent aerosol production is required. Many labs generate aerosol by manually activating peristaltic pumps and ECIG devices simultaneously in a predefined manner. The tedium involved with this process (large puff number over time) and risk of error in keeping with puff topography (puff number, duration, interval) are less than optimal. Furthermore, excess puffing on an ECIG device results in battery depletion, reducing aerosol production, and ultimately, its chemical and physical nature. While commercial vaping machines are available, the cost of these machines is prohibitive to many labs. For these reasons, an economical and programmable ECIG aerosol generator, capable of generating aerosol from two atomizers simultaneously, was fabricated, and subsequently validated. Validation determinants include measurements of atomizer temperatures (inside and outside), electrical parameters (current, resistance and power) of the circuitry, aerosol particle distribution (particle counts and mass concentrations) and aerosol delivery (indexed by nicotine recovery), all during stressed conditions of four puffs/minute for 75 min (i.e., 300 puffs). Validation results indicate that the ECIG aerosol generator is better suited for experiments involving ≤100 puffs. Over 100 puffs, the amount of variation in the parameters measured tends to increase. Variations between channels are generally higher than variations within a channel. Despite significant variations in temperatures, electrical parameters, and aerosol particle distributions, both within and between channels, aerosol delivery remains remarkably stable for up to 300 puffs, yielding over 25% nicotine recovery for both channels. In conclusion, this programmable, dual-channel ECIG aerosol generator is not only affordable, but also allows the user to control puff topography and eliminate battery drain of ECIG devices. Consequently, this aerosol generator is valid, reliable, economical, capable of using a variety of E-liquids and amenable for use in a vast number of studies investigating the effects of ECIG-generated aerosol while utilizing a multitude of puffing regimens in a standardized manner.
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Affiliation(s)
- Dominic L. Palazzolo
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
- Correspondence:
| | - Jordan Caudill
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
| | - James Baron
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
| | - Kevin Cooper
- Department of Chemistry and Physics, School of Mathematics & Sciences, Lincoln Memorial University, Harrogate, TN 37752, USA;
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16
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Sussman MA. VAPIng into ARDS: Acute Respiratory Distress Syndrome and Cardiopulmonary Failure. Pharmacol Ther 2021; 232:108006. [PMID: 34582836 DOI: 10.1016/j.pharmthera.2021.108006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 09/10/2021] [Accepted: 09/23/2021] [Indexed: 12/12/2022]
Abstract
"Modern" vaping involving battery-operated electronic devices began approximately one dozen years and has quickly evolved into a multibillion dollar industry providing products to an estimated 50 million users worldwide. Originally developed as an alternative to traditional cigarette smoking, vaping now appeals to a diverse demographic including substantial involvement of young people who often have never used cigarettes. The rapid rise of vaping fueled by multiple factors has understandably outpaced understanding of biological effects, made even more challenging due to wide ranging individual user habits and preferences. Consequently while vaping-related research gathers momentum, vaping-associated pathological injury (VAPI) has been established by clinical case reports with severe cases manifesting as acute respiratory distress syndrome (ARDS) with examples of right ventricular cardiac failure. Therefore, basic scientific studies are desperately needed to understand the impact of vaping upon the lungs as well as cardiopulmonary structure and function. Experimental models that capture fundamental characteristics of vaping-induced ARDS are essential to study pathogenesis and formulate recommendations to mitigate harmful effects attributable to ingredients or equipment. So too, treatment strategies to promote recovery from vaping-associated damage require development and testing at the preclinical level. This review summarizes the back story of vaping leading to present day conundrums with particular emphasis upon VAPI-associated ARDS and prioritization of research goals.
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Affiliation(s)
- Mark A Sussman
- SDSU Integrated Regenerative Research Institute and Biology Department, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA.
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17
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Amalia B, Fu M, Tigova O, Ballbè M, Castellano Y, Semple S, Clancy L, Vardavas C, López MJ, Cortés N, Pérez-Ortuño R, Pascual JA, Fernández E. Environmental and individual exposure to secondhand aerosol of electronic cigarettes in confined spaces: Results from the TackSHS Project †. INDOOR AIR 2021; 31:1601-1613. [PMID: 33905602 DOI: 10.1111/ina.12841] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 04/08/2021] [Accepted: 04/09/2021] [Indexed: 06/12/2023]
Abstract
Secondhand electronic cigarette (e-cigarette) aerosol (SHA) might impair indoor air quality and expose bystanders. This study aims to investigate exposure to SHA in controlled conditions of enclosed settings simulating real-world scenario. An experiment was performed in a car and in a room, in which SHA was generated during a 30-minute ad libitum use of an e-cigarette. The experiment was replicated on five consecutive days in each setting. We measured PM2.5 , airborne nicotine concentrations, and biomarkers of exposure to SHA, such as nicotine metabolites, tobacco-specific nitrosamines, propylene glycol, and glycerol in bystanders' saliva samples before, during, and after the exposure period. Self-reported health symptoms related to exposure to SHA were also recorded. The results showed that the highest median PM2.5 concentration was recorded during the exposure period, being 21 µg/m3 in the room setting and 16 µg/m3 in the car setting-about twofold increase compared to the baseline. Most concentrations of the airborne nicotine and all biomarkers were below the limit of quantification in both settings. Bystanders in both settings experienced some short-term irritation symptoms, expressed as dry throat, nose, eyes, and phlegm. In conclusion, short-term use of an e-cigarette in confined spaces increased indoor PM2.5 level and caused some irritation symptoms in bystanders.
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Affiliation(s)
- Beladenta Amalia
- Tobacco Control Unit, Catalan Institute of Oncology-ICO, WHO Collaborating Centre for Tobacco Control, L'Hospitalet de Llobregat, Barcelona, Spain
- Tobacco Control Research Group, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain
- School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
| | - Marcela Fu
- Tobacco Control Unit, Catalan Institute of Oncology-ICO, WHO Collaborating Centre for Tobacco Control, L'Hospitalet de Llobregat, Barcelona, Spain
- Tobacco Control Research Group, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain
- School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Consortium for Biomedical Research in Respiratory Diseases (CIBERES), Madrid, Spain
| | - Olena Tigova
- Tobacco Control Unit, Catalan Institute of Oncology-ICO, WHO Collaborating Centre for Tobacco Control, L'Hospitalet de Llobregat, Barcelona, Spain
- Tobacco Control Research Group, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain
- School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Consortium for Biomedical Research in Respiratory Diseases (CIBERES), Madrid, Spain
| | - Montse Ballbè
- Tobacco Control Unit, Catalan Institute of Oncology-ICO, WHO Collaborating Centre for Tobacco Control, L'Hospitalet de Llobregat, Barcelona, Spain
- Tobacco Control Research Group, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain
- Consortium for Biomedical Research in Respiratory Diseases (CIBERES), Madrid, Spain
- Addictions Unit, Institute of Neurosciences, Hospital Clínic de Barcelona, Barcelona, Spain
| | - Yolanda Castellano
- Tobacco Control Unit, Catalan Institute of Oncology-ICO, WHO Collaborating Centre for Tobacco Control, L'Hospitalet de Llobregat, Barcelona, Spain
- Tobacco Control Research Group, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain
- School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Consortium for Biomedical Research in Respiratory Diseases (CIBERES), Madrid, Spain
| | - Sean Semple
- Institute for Social Marketing, University of Stirling, Stirling, Scotland
| | - Luke Clancy
- TobaccoFree Research Institute Ireland, Dublin, Ireland
| | | | - Maria J López
- Evaluation and Intervention Methods Service, Agència de Salut Pública de Barcelona, Barcelona, Spain
- CIBER de Epidemiología y Salud Pública (CIBERESP), Madrid, Spain
- Research group on Evaluation of Public Health Policies and Programs, Institut d'Investigació Biomèdica Sant Pau (IIB St. Pau), Barcelona, Spain
| | - Nuria Cortés
- Laboratory, Agència de Salut Pública de Barcelona, Spain
| | - Raúl Pérez-Ortuño
- Hospital del Mar Medical Research Institute (IMIM), Barcelona, Spain
| | - José A Pascual
- Hospital del Mar Medical Research Institute (IMIM), Barcelona, Spain
- Department of Experimental and Health Sciences, University Pompeu Fabra, Barcelona, Spain
| | - Esteve Fernández
- Tobacco Control Unit, Catalan Institute of Oncology-ICO, WHO Collaborating Centre for Tobacco Control, L'Hospitalet de Llobregat, Barcelona, Spain
- Tobacco Control Research Group, Bellvitge Biomedical Research Institute-IDIBELL, L'Hospitalet de Llobregat, Barcelona, Spain
- School of Medicine and Health Sciences, University of Barcelona, Barcelona, Spain
- Consortium for Biomedical Research in Respiratory Diseases (CIBERES), Madrid, Spain
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18
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AL-Qaysi WW, Abdulla FH. Analytical methods for the identification of micro/nano metals in e-cigarette emission samples: a review. CHEMICKE ZVESTI 2021; 75:6169-6180. [PMID: 34421189 PMCID: PMC8370834 DOI: 10.1007/s11696-021-01779-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Accepted: 07/04/2021] [Indexed: 12/04/2022]
Abstract
In this review, numerous analytical methods to quantify the heavy and trace elements emitted from electronic cigarettes, cigarettes liquid and atomizer. The selection of a method was dependent upon the purpose, e.g., quantification or identification of elements only. The introductory part of this review focuses on describing the importance of setting up an electronic cigarettes- associated safety profile. The review dealt with studies that assessed elements in sizes ranging from nano to micro. The formation of different degradation chemical substances as well as impurity trends can be indicated through chemical investigation of metals in electronic cigarettes. Some studies have been covered that show the uses and benefits of. It is noticeable from all the collected sources that the minerals emitted from the smoke of e- cigs do not constitute any significant damage, as the percentage is very small, with the exception of minerals that may be emitted from the components of the device after heating it if the components of the e- cig are of poor specifications, except in the case of long-term accumulation. For this reason, an electronic cigarette can help smokers to quit smoking tobacco and replace it with electronic cigarettes smoke with distinctive flavors.
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Affiliation(s)
- Wafaa Waleed AL-Qaysi
- Institute of Analytical Chemistry, Chemo and Biosensors, University of Regensburg, Universitätsstraße 31, 93040 Regensburg, Germany
- Department of Chemistry, College of Science, University of Baghdad, Al-Jadriya campus, 10071 Baghdad, Iraq
| | - Fatma H. Abdulla
- Department of Chemistry, College of Science, University of Baghdad, Al-Jadriya campus, 10071 Baghdad, Iraq
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19
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Jia S, Zhang Q, Yang L, Sarkar S, Krishnan P, Mao J, Hang J, Chang M, Zhang Y, Wang X, Chen W. Deposition of ambient particles in the human respiratory system based on single particle analysis: A case study in the Pearl River Delta, China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 283:117056. [PMID: 33862340 DOI: 10.1016/j.envpol.2021.117056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 03/27/2021] [Accepted: 03/29/2021] [Indexed: 06/12/2023]
Abstract
It is important to evaluate how ambient particles are deposited in the human respiratory system in view of the adverse effects they pose to human health. Traditional methods of investigating human exposure to ambient particles suffer from drawbacks related either to the lack of chemical information from particle number-based measurements or to the poor time resolution of mass-based measurements. To address these issues, in this study, human exposure to ambient particulate matter was investigated using single particle analysis, which provided chemical information with a high time resolution. Based on single particle measurements conducted in the Pearl River Delta, China, nine particle types were identified, and EC (elemental carbon) particles were determined to be the most dominant type of particle. In general, the submicron size mode was dominant in terms of the number concentration for all of the particle types, except for Na-rich and dust particles. On average, around 34% of particles were deposited in the human respiratory system with 13.9%, 7.9%, and 12.6% being distributed in the head, tracheobronchial, and pulmonary regions, respectively. The amount of Na-rich particles deposited was the highest, followed by EC. The overall deposition efficiencies of the Na-rich and dust particles were higher than those of the other particle types due to their higher efficiencies in the head region, which could be caused by the greater sedimentation and impaction rates of larger particles. In the head region, the Na-rich particles made the largest contribution (30.5%) due to their high deposition efficiency, whereas in the tracheobronchial and pulmonary regions, EC made the largest contribution due to its high concentration. In summary, the findings of this initial trial demonstrate the applicability of single particle analysis to the assessment of human exposure to ambient particles and its potential to support traditional methods of analysis.
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Affiliation(s)
- Shiguo Jia
- School of Atmospheric Sciences, & Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, 510275, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, PR China; Guangdong Provincial Field Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary, Guangzhou, 510275, PR China
| | - Qi Zhang
- School of Atmospheric Sciences, & Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, 510275, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, PR China
| | - Liming Yang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore
| | - Sayantan Sarkar
- School of Engineering, Indian Institute of Technology (IIT), Mandi, Kamand, Himachal Pradesh, 175005, India
| | - Padmaja Krishnan
- Department of Civil & Environmental Engineering, National University of Singapore, 1 Engineering Drive 2, 117576, Singapore
| | - Jingying Mao
- Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Institute for Environmental and Climate Research, Jinan University, Guangzhou, 510632, PR China
| | - Jian Hang
- School of Atmospheric Sciences, & Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou, 510275, PR China; Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai, PR China; Guangdong Provincial Field Observation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary, Guangzhou, 510275, PR China
| | - Ming Chang
- Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Institute for Environmental and Climate Research, Jinan University, Guangzhou, 510632, PR China
| | - Yiqiang Zhang
- South China Institute of Environmental Science, MEE, Guangzhou, 510530, PR China
| | - Xuemei Wang
- Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Institute for Environmental and Climate Research, Jinan University, Guangzhou, 510632, PR China
| | - Weihua Chen
- Guangdong-Hongkong-Macau Joint Laboratory of Collaborative Innovation for Environmental Quality, Institute for Environmental and Climate Research, Jinan University, Guangzhou, 510632, PR China.
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20
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Modeling Aerial Transmission of Pathogens (Including the SARS-CoV-2 Virus) through Aerosol Emissions from E-Cigarettes. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11146355] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We examine the plausibility of aerial transmission of pathogens (including the SARS-CoV-2 virus) through respiratory droplets that might be carried by exhaled e-cigarette aerosol (ECA). Given the lack of empiric evidence on this phenomenon, we consider available evidence on cigarette smoking and respiratory droplet emission from mouth breathing through a mouthpiece as convenient proxies to infer the capacity of vaping to transport pathogens in respiratory droplets. Since both exhaled droplets and ECA droplets are within the Stokes regime, the ECA flow acts effectively as a visual tracer of the expiratory flow. To infer quantitatively the direct exposure distance, we consider a model that approximates exhaled ECA flow as an axially symmetric intermittent steady starting jet evolving into an unstable puff, an evolution that we corroborate by comparison with photographs and videos of actual vapers. On the grounds of all this theoretical modeling, we estimate for low-intensity vaping (practiced by 80–90% of vapers) the emission of 6–210 (median 39.9, median deviation 67.3) respiratory submicron droplets per puff and a horizontal distance spread of 1–2 m, with intense vaping possibly emitting up to 1000 droplets per puff in the submicron range with a distance spread over 2 m. The optical visibility of the ECA flow has important safety implications, as bystanders become instinctively aware of the scope and distance of possible direct contagion through the vaping jet.
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21
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Luo Y, Wu Y, Li L, Guo Y, Çetintaş E, Zhu Y, Ozcan A. Dynamic Imaging and Characterization of Volatile Aerosols in E-Cigarette Emissions Using Deep Learning-Based Holographic Microscopy. ACS Sens 2021; 6:2403-2410. [PMID: 34081429 DOI: 10.1021/acssensors.1c00628] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Various volatile aerosols have been associated with adverse health effects; however, characterization of these aerosols is challenging due to their dynamic nature. Here, we present a method that directly measures the volatility of particulate matter (PM) using computational microscopy and deep learning. This method was applied to aerosols generated by electronic cigarettes (e-cigs), which vaporize a liquid mixture (e-liquid) that mainly consists of propylene glycol (PG), vegetable glycerin (VG), nicotine, and flavoring compounds. E-cig-generated aerosols were recorded by a field-portable computational microscope, using an impaction-based air sampler. A lensless digital holographic microscope inside this mobile device continuously records the inline holograms of the collected particles. A deep learning-based algorithm is used to automatically reconstruct the microscopic images of e-cig-generated particles from their holograms and rapidly quantify their volatility. To evaluate the effects of e-liquid composition on aerosol dynamics, we measured the volatility of the particles generated by flavorless, nicotine-free e-liquids with various PG/VG volumetric ratios, revealing a negative correlation between the particles' volatility and the volumetric ratio of VG in the e-liquid. For a given PG/VG composition, the addition of nicotine dominated the evaporation dynamics of the e-cig aerosol and the aforementioned negative correlation was no longer observed. We also revealed that flavoring additives in e-liquids significantly decrease the volatility of e-cig aerosol. The presented holographic volatility measurement technique and the associated mobile device might provide new insights on the volatility of e-cig-generated particles and can be applied to characterize various volatile PM.
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Affiliation(s)
- Yi Luo
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States
- Bioengineering Department, University of California, Los Angeles, California 90095, United States
- California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
| | - Yichen Wu
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States
- Bioengineering Department, University of California, Los Angeles, California 90095, United States
- California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
| | - Liqiao Li
- Department of Environmental Health Sciences, University of California, Los Angeles, California 90095, United States
| | - Yuening Guo
- Department of Environmental Health Sciences, University of California, Los Angeles, California 90095, United States
| | - Ege Çetintaş
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States
- Bioengineering Department, University of California, Los Angeles, California 90095, United States
- California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
| | - Yifang Zhu
- Department of Environmental Health Sciences, University of California, Los Angeles, California 90095, United States
| | - Aydogan Ozcan
- Electrical and Computer Engineering Department, University of California, Los Angeles, California 90095, United States
- Bioengineering Department, University of California, Los Angeles, California 90095, United States
- California Nano Systems Institute (CNSI), University of California, Los Angeles, California 90095, United States
- David Geffen School of Medicine, University of California, Los Angeles, California 90095, United States
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22
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Occupational exposure to particulate matter during blackboard teaching and its deposition in the airways of human lungs. Int Arch Occup Environ Health 2021; 94:1963-1974. [PMID: 33999262 DOI: 10.1007/s00420-021-01713-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2021] [Accepted: 04/07/2021] [Indexed: 10/21/2022]
Abstract
PURPOSE This study aims to estimate the teachers' exposure to particulate matter (PM) during a chalk and talk class considering various exposure conditions and to determine the deposition pattern of PM in human airways. MATERIALS AND METHODOLOGY The study was carried out in three steps, viz., questionnaire survey, exposure measurement, and dosage calculation. Exposure to chalk dust during teaching was measured for 40 teachers in terms of PM of different size range (PM 10, PM 2.5, and PM 1) while using different brands of chalks. Deposition in lungs was determined using Multiple Path Dosimetry model for four subject categories, viz., adult men, elderly men, adult women, and elderly women. RESULTS The average exposure during teaching activity was 498, 85, and 30 µg/m3 of PM 10, PM 2.5, and PM 1, respectively. Chalks which are made of calcium carbonate with high density of packing emitted lesser PM 10. Results showed no significant difference in the exposure to PM by teachers while writing at different relative heights of the board. The highest total deposition of PM in lung was observed for elderly women. The deposited mass per unit area was the highest for adult women in all the three sizes of PM. CONCLUSION This study showed that there was no significant difference in exposure to PM while using normal and dustless chalks. The exposure level suggests that there is a strong need to either shift to smart classes or to improve the technology in chalk production in such a way that it produces less dust and limit the exposure to teaching professionals.
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23
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Hayeck N, Zoghzoghi C, Karam E, Salman R, Karaoghlanian N, Shihadeh A, Eissenberg T, Zein El Dine S, Saliba NA. Carrier Solvents of Electronic Nicotine Delivery Systems Alter Pulmonary Surfactant. Chem Res Toxicol 2021; 34:1572-1577. [PMID: 33945261 PMCID: PMC8220501 DOI: 10.1021/acs.chemrestox.0c00528] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
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In late 2019, hundreds
of users of electronic products that aerosolize
a liquid for inhalation were hospitalized with a variety of respiratory
and gastrointestinal symptoms. While some investigations have attributed
the disease to the presence of vitamin E acetate in liquids that also
contained tetrahydrocannabinol, some evidence suggests that chronic
inhalation of two common solvents used in electronic nicotine delivery
systems (ENDS), propylene glycol (PG) and vegetable glycerin (VG),
can interfere with the lipid components of pulmonary surfactant and
cause or exacerbate pulmonary injury. The interaction between PG,
VG, and lung surfactant is not yet understood. This study presents
an examination of the molecular interactions of PG and VG with lung
surfactant mimicked by 1,2-dipalmitoyl-sn-glycero-3-phosphocholine
(DPPC). The interaction of DPPC and PG-VG is studied by attenuated
total reflectance fourier transform infrared spectroscopy. The results
showed that PG and VG altered the molecular alignment of the DPPC
surfactant. The orientation of the surfactant at the surface of the
lung affects the surface tension at the air–water interface,
thereby influencing breathing. These findings suggest that chronic
aerosolization of the primary solvents in ENDS might alter the function
of pulmonary surfactant.
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Affiliation(s)
- Nathalie Hayeck
- Chemistry Department, Faculty of Arts and Sciences, American University of Beirut, Beirut 1107-2020, Lebanon.,Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Carl Zoghzoghi
- Chemistry Department, Faculty of Arts and Sciences, American University of Beirut, Beirut 1107-2020, Lebanon
| | - Ebrahim Karam
- Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States.,Mechanical Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, 1107-2020 Beirut, Lebanon
| | - Rola Salman
- Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States.,Mechanical Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, 1107-2020 Beirut, Lebanon
| | - Nareg Karaoghlanian
- Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States.,Mechanical Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, 1107-2020 Beirut, Lebanon
| | - Alan Shihadeh
- Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States.,Mechanical Engineering Department, Maroun Semaan Faculty of Engineering and Architecture, American University of Beirut, 1107-2020 Beirut, Lebanon
| | - Thomas Eissenberg
- Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States.,Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Salah Zein El Dine
- Department of Internal Medicine, Faculty of Medicine, American University of Beirut, 1107-2020 Beirut, Lebanon
| | - Najat A Saliba
- Chemistry Department, Faculty of Arts and Sciences, American University of Beirut, Beirut 1107-2020, Lebanon.,Center for the Study of Tobacco Products, Department of Psychology, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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24
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Wu J, Yang M, Huang J, Gao Y, Li D, Gao N. Vaporization characteristics and aerosol optical properties of electronic cigarettes. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 275:116670. [PMID: 33582624 DOI: 10.1016/j.envpol.2021.116670] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 01/09/2021] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
The aerosols generated from electronic cigarettes have a significant impact on the human respiratory system. Understanding the vaporization characteristics and aerosol optical properties of electronic cigarettes is important for assessing human exposure to aerosols. An experimental platform was designed and built to simulate the atomization process of electronic cigarette and detect the laser transmissivity of aerosols. The optical properties of single particles and polydispersed particle system for aerosols in the visible wavelength ranges of 400-780 nm were analyzed based on Mie theory. The results show that a higher heating power supplied by coil results in a larger average vaporization rate of e-liquid. Meanwhile, the steady-state transmissivity of the laser beam for aerosols reduces as the heating power increases. Under the same heating power and puffing topography, the total particulate mass (TPM) of aerosols generated by the e-liquid composed of higher vegetable glycerin (VG) content decreases. The scattering efficiency factor of aerosol particle of electronic cigarette increases with an increase in particle size. The volume scattering coefficients of a polydispersed particle system of aerosols decrease as the incident visible wavelengths increase. A higher VG content in e-liquid results in decreased TPM and particle number concentration of aerosols and increased the volume scattering coefficient in the visible wavelength range. It can explain an interesting phenomenon that a lower TPM and a better visual effect brought by the aerosols generated by the e-liquid with a higher VG content could be observed concurrently. The mass indexes (e.g., TPM, average vaporization rate, average mass concentration) and optical indexes (e.g., volume scattering coefficient, laser transmissivity) are suggested to be used for the comprehensive evaluation of relative amounts of aerosols. The results have potential significances for the objective and quantitative assessments of aerosols generated from electronic cigarettes.
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Affiliation(s)
- Jinlu Wu
- School of Mechanical Engineering, Tongji University, Shanghai, 201804, China
| | - Muyun Yang
- School of Mechanical Engineering, Tongji University, Shanghai, 201804, China
| | - Jiejie Huang
- School of Mechanical Engineering, Tongji University, Shanghai, 201804, China
| | - Yihan Gao
- Shanghai New Tobacco Product Research Institute, Shanghai, 201315, China
| | - Dian Li
- China Tobacco Guangxi Industrial Co., Ltd, Nanning, 530001, China
| | - Naiping Gao
- School of Mechanical Engineering, Tongji University, Shanghai, 201804, China.
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25
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Toxicology of flavoring- and cannabis-containing e-liquids used in electronic delivery systems. Pharmacol Ther 2021; 224:107838. [PMID: 33746051 DOI: 10.1016/j.pharmthera.2021.107838] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 03/11/2021] [Indexed: 12/15/2022]
Abstract
Electronic cigarettes (e-cigarettes) were introduced in the United States in 2007 and by 2014 they were the most popular tobacco product amongst youth and had overtaken use of regular tobacco cigarettes. E-cigarettes are used to aerosolize a liquid (e-liquid) that the user inhales. Flavorings in e-liquids is a primary reason for youth to initiate use of e-cigarettes. Evidence is growing in the scientific literature that inhalation of some flavorings is not without risk of harm. In this review, 67 original articles (primarily cellular in vitro) on the toxicity of flavored e-liquids were identified in the PubMed and Scopus databases and evaluated critically. At least 65 individual flavoring ingredients in e-liquids or aerosols from e-cigarettes induced toxicity in the respiratory tract, cardiovascular and circulatory systems, skeletal system, and skin. Cinnamaldehyde was most frequently reported to be cytotoxic, followed by vanillin, menthol, ethyl maltol, ethyl vanillin, benzaldehyde and linalool. Additionally, modern e-cigarettes can be modified to aerosolize cannabis as dried plant material or a concentrated extract. The U.S. experienced an outbreak of lung injuries, termed e-cigarette, or vaping, product use-associated lung injury (EVALI) that began in 2019; among 2,022 hospitalized patients who had data on substance use (as of January 14, 2020), 82% reported using a delta-9-tetrahydrocannabinol (main psychoactive component in cannabis) containing e-cigarette, or vaping, product. Our literature search identified 33 articles related to EVALI. Vitamin E acetate, a diluent and thickening agent in cannabis-based products, was strongly linked to the EVALI outbreak in epidemiologic and laboratory studies; however, e-liquid chemistry is highly complex, and more than one mechanism of lung injury, ingredient, or thermal breakdown product may be responsible for toxicity. More research is needed, particularly with regard to e-cigarettes (generation, power settings, etc.), e-liquids (composition, bulk or vaped form), modeled systems (cell type, culture type, and dosimetry metrics), biological monitoring, secondhand exposures and contact with residues that contain nicotine and flavorings, and causative agents and mechanisms of EVALI toxicity.
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26
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Su WC, Wong SW, Buu A. Deposition of E-cigarette aerosol in human airways through passive vaping. INDOOR AIR 2021; 31:348-356. [PMID: 33020934 PMCID: PMC7904647 DOI: 10.1111/ina.12754] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 09/21/2020] [Accepted: 09/25/2020] [Indexed: 05/06/2023]
Abstract
Secondary exposure to e-cigarette aerosol (passive vaping) will soon become a pressing public health issue in the world. Yet, the current knowledge about respiratory depositions of e-cigarette aerosol through passive vaping in human airways is limited due to critical weaknesses of traditional experimental methods. To fill in this important knowledge gap, this study proposed a special approach involving an upgraded Mobile Aerosol Lung Deposition Apparatus (MALDA) that consists of a set of human airway replicas including a head airway, tracheobronchial airways down to the 11th lung generation, and a representative alveolar section. In addition to the comprehensive coverage of human airways, the MALDA is easily transportable for providing efficient estimations of aerosol respiratory deposition. In this study, the MALDA was first evaluated in the laboratory and then applied to estimate the respiratory deposition associated with passive vaping in an indoor real-life setting. The results showed that the respiratory deposition data aligned closely with the conventional respiratory deposition curves not only in the head-to-TB region but also in the alveolar region. The strengths of MALDA demonstrate great promise for a wide variety of applications in real-life settings that could provide crucial information for future public health and indoor air quality studies.
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Affiliation(s)
- Wei-Chung Su
- Department of Epidemiology, Human Genetics & Environmental Sciences, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Su-Wei Wong
- Department of Health Promotion & Behavioral Sciences, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX, USA
| | - Anne Buu
- Department of Health Promotion & Behavioral Sciences, School of Public Health, University of Texas Health Science Center at Houston, Houston, TX, USA
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27
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Zhang R, Jones MM, Dornsife RE, Wu T, Sivaraman V, Tarran R, Onyenwoke RU. JUUL e-liquid exposure elicits cytoplasmic Ca 2+ responses and leads to cytotoxicity in cultured airway epithelial cells. Toxicol Lett 2021; 337:46-56. [PMID: 33253780 PMCID: PMC7772262 DOI: 10.1016/j.toxlet.2020.11.017] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 10/27/2020] [Accepted: 11/18/2020] [Indexed: 12/15/2022]
Abstract
RATIONALE The popularity of new and emerging tobacco products such as E-cigarettes (E-cigs) is rapidly expanding worldwide. However, uncertainties surrounding the potential health consequences due to the use of such products exist and warrant further study. METHODS Cultured A549 and Calu-3 airway epithelia were exposed to three out of the eight types of JUUL brand e-liquids ("Mint", "Virginia Tobacco" and "Menthol", all containing 3% nicotine at 1% and 3% (vol/vol) dilutions) and assessed for viability using a resazurin-based assay. Intracellular Ca2+ levels were measured using fluorescent indicators and pro-inflammatory cytokine levels were monitored by quantitative PCR (qPCR). Cultures were also analyzed by flow cytometry to evaluate apoptotic markers and cell viability. RESULTS Exposing the airway epithelial cells to the flavored JUUL e-liquids led to significant cytotoxicity, with the "Mint" flavor being the overall most cytotoxic. The "Mint" flavored e-liquid also led to significant elevations in intracellular Ca2+ and upregulation of the pro-inflammatory cytokine IL-6 and early apoptotic marker Annexin V. CONCLUSIONS JUUL e-liquid challenge resulted in a loss of airway epithelial cell viability, induced pro-inflammatory responses and eventually caused apoptosis.
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Affiliation(s)
- Rui Zhang
- Department of Respiratory and Critical Care Medicine, General Hospital of Ningxia Medical University, Yinchuan, Ningxia, PR China; Biomanufacturing Research Institute and Technology Enterprise (BRITE), Durham, NC, United States
| | - Myles M Jones
- Department of Biological and Biomedical Sciences, Durham, NC, United States
| | - Ronna E Dornsife
- Biomanufacturing Research Institute and Technology Enterprise (BRITE), Durham, NC, United States
| | - Tongde Wu
- Biomanufacturing Research Institute and Technology Enterprise (BRITE), Durham, NC, United States; Department of Pharmaceutical Sciences, North Carolina Central University, Durham, NC, United States
| | - Vijay Sivaraman
- Department of Biological and Biomedical Sciences, Durham, NC, United States
| | - Robert Tarran
- Department of Cell Biology & Physiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Rob U Onyenwoke
- Biomanufacturing Research Institute and Technology Enterprise (BRITE), Durham, NC, United States; Department of Pharmaceutical Sciences, North Carolina Central University, Durham, NC, United States.
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28
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Aerosol droplet-size distribution and airborne nicotine portioning in particle and gas phases emitted by electronic cigarettes. Sci Rep 2020; 10:21707. [PMID: 33303941 PMCID: PMC7728817 DOI: 10.1038/s41598-020-78749-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Accepted: 11/19/2020] [Indexed: 11/25/2022] Open
Abstract
The reliable characterization of particle size distribution and nicotine delivery emitted by electronic cigarettes (ECs) is a critical issue in their design. Indeed, a better understanding of how nicotine is delivered as an aerosol with an appropriate aerodynamic size is a necessary step toward obtaining a well-designed nicotine transfer from the respiratory tract to the bloodstream to better satisfy craving and improve smoking cessation rates. To study these two factors, recent models of EC devices and a dedicated vaping machine were used to generate aerosols under various experimental conditions, including varying the EC power level using two different types of atomizers. The aerodynamic particle sizing of the resulting aerosol was performed using a cascade impactor. The nicotine concentration in the refill liquid and the aerosol droplet was quantified by liquid chromatography coupled with a photodiode array. The vaporization process and the physical and chemical properties of the EC aerosol were very similar at 15 watts (W) and 25 W using the low-power atomizer but quite distinct at 50 W using the high-power atomizer, as follows: (1) the mass median aerodynamic diameters ranged from 1.06 to 1.19 µm (µm) for low power and from 2.33 to 2.46 µm for high power; (2) the nicotine concentrations of aerosol droplets were approximately 11 mg per milliliter (mg/mL) for low power and 17 mg/mL for high power; and (3) the aerosol droplet particle phase of the total nicotine mass emitted by EC was 60% for low power and 95% for high power. The results indicate that varying the correlated factors (1) the power level and (2) the design of atomizer (including the type of coil and the value of resistance used) affects the particle-size distribution and the airborne nicotine portioning between the particle phase and the gas phase in equilibrium with the airborne droplets.
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29
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Spahn JE, Stavchansky SA, Cui Z. Critical research gaps in electronic cigarette devices and nicotine aerosols. Int J Pharm 2020; 593:120144. [PMID: 33285247 DOI: 10.1016/j.ijpharm.2020.120144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Revised: 11/27/2020] [Accepted: 11/28/2020] [Indexed: 12/26/2022]
Abstract
Electronic cigarettes (e-cigs) are devices that aerosolize nicotine-containing liquids for delivery as an inhaled vapor. E-cigs are currently marketed as smoking cessation devices, though the emergence and rapid adoption of these devices in recent years has sparked a great deal of concern over their safety. Given the plethora of devices and nicotine solutions available on the market and the lack of regulation and quality control, it is imperative that these devices and nicotine formulations are studied to assess critical operating parameters, the pharmacokinetic profiles of the inhaled nicotine, and the toxicity profiles of the e-cig aerosols. This review aims to deliver an overview of current research regarding electronic cigarette devices, nicotine-containing liquid formulations, pharmacokinetics of nicotine, and toxicology studies in order to highlight areas lacking in research or requiring greater standardization and regulation.
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Affiliation(s)
- Jamie E Spahn
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, Austin, TX, USA.
| | - Salomon A Stavchansky
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, Austin, TX, USA.
| | - Zhengrong Cui
- Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, 2409 University Avenue, Austin, TX, USA.
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30
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Noël A, Hossain E, Perveen Z, Zaman H, Penn AL. Sub-ohm vaping increases the levels of carbonyls, is cytotoxic, and alters gene expression in human bronchial epithelial cells exposed at the air-liquid interface. Respir Res 2020; 21:305. [PMID: 33213456 PMCID: PMC7678293 DOI: 10.1186/s12931-020-01571-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Accepted: 11/11/2020] [Indexed: 12/16/2022] Open
Abstract
Background Exposure to electronic-cigarette (e-cig) aerosols induces potentially fatal e-cig or vaping-associated lung injury (EVALI). The cellular and molecular mechanisms underlying these effects, however, are unknown. We used an air–liquid interface (ALI) in vitro model to determine the influence of two design characteristics of third-generation tank-style e-cig devices—resistance and voltage—on (1) e-cig aerosol composition and (2) cellular toxicity. Methods Human bronchial epithelial cells (H292) were exposed to either butter-flavored or cinnamon-flavored e-cig aerosols at the ALI in a Vitrocell exposure system connected to a third-generation e-cig device. Exposures were conducted following a standard vaping topography profile for 2 h per day, for 1 or 3 consecutive days. 24 h after ALI exposures cellular and molecular outcomes were assessed. Results We found that butter-flavored e-cig aerosol produced under ‘sub-ohm’ conditions (< 0.5 Ω) contains high levels of carbonyls (7–15 μg/puff), including formaldehyde, acetaldehyde and acrolein. E-cig aerosol produced under regular vaping conditions (resistance > 1 Ω and voltage > 4.5 V), contains lower carbonyl levels (< 2 μg/puff). We also found that the levels of carbonyls produced in the cinnamon-flavored e-cig aerosols were much lower than that of the butter-flavored aerosols. H292 cells exposed to butter-flavored or cinnamon-flavored e-cig aerosol at the ALI under ‘sub-ohm’ conditions for 1 or 3 days displayed significant cytotoxicity, decreased tight junction integrity, increased reactive oxygen species production, and dysregulated gene expression related to biotransformation, inflammation and oxidative stress (OS). Additionally, the cinnamon-flavored e-cig aerosol induced pro-oxidant effects as evidenced by increases in 8-hydroxy-2-deoxyguanosine protein levels. Moreover, we confirmed the involvement of OS as a toxicity process for cinnamon-flavored e-cig aerosol by pre-treating the cells with N-acetyl cysteine (NAC), an antioxidant that prevented the cells from the OS-mediated damage induced by the e-cig aerosol. Conclusion The production of high levels of carbonyls may be flavor specific. Overall, inhaling e-cig aerosols produced under ‘sub-ohm’ conditions is detrimental to lung epithelial cells, potentially via mechanisms associated with OS. This information could help policymakers take the necessary steps to prevent the manufacturing of sub-ohm atomizers for e-cig devices.
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Affiliation(s)
- Alexandra Noël
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA.
| | - Ekhtear Hossain
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
| | - Zakia Perveen
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
| | - Hasan Zaman
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
| | - Arthur L Penn
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
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Noël A, Hossain E, Perveen Z, Zaman H, Penn AL. Sub-ohm vaping increases the levels of carbonyls, is cytotoxic, and alters gene expression in human bronchial epithelial cells exposed at the air-liquid interface. Respir Res 2020. [PMID: 33213456 DOI: 10.1186/s12931‐020‐01571‐1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND Exposure to electronic-cigarette (e-cig) aerosols induces potentially fatal e-cig or vaping-associated lung injury (EVALI). The cellular and molecular mechanisms underlying these effects, however, are unknown. We used an air-liquid interface (ALI) in vitro model to determine the influence of two design characteristics of third-generation tank-style e-cig devices-resistance and voltage-on (1) e-cig aerosol composition and (2) cellular toxicity. METHODS Human bronchial epithelial cells (H292) were exposed to either butter-flavored or cinnamon-flavored e-cig aerosols at the ALI in a Vitrocell exposure system connected to a third-generation e-cig device. Exposures were conducted following a standard vaping topography profile for 2 h per day, for 1 or 3 consecutive days. 24 h after ALI exposures cellular and molecular outcomes were assessed. RESULTS We found that butter-flavored e-cig aerosol produced under 'sub-ohm' conditions (< 0.5 Ω) contains high levels of carbonyls (7-15 μg/puff), including formaldehyde, acetaldehyde and acrolein. E-cig aerosol produced under regular vaping conditions (resistance > 1 Ω and voltage > 4.5 V), contains lower carbonyl levels (< 2 μg/puff). We also found that the levels of carbonyls produced in the cinnamon-flavored e-cig aerosols were much lower than that of the butter-flavored aerosols. H292 cells exposed to butter-flavored or cinnamon-flavored e-cig aerosol at the ALI under 'sub-ohm' conditions for 1 or 3 days displayed significant cytotoxicity, decreased tight junction integrity, increased reactive oxygen species production, and dysregulated gene expression related to biotransformation, inflammation and oxidative stress (OS). Additionally, the cinnamon-flavored e-cig aerosol induced pro-oxidant effects as evidenced by increases in 8-hydroxy-2-deoxyguanosine protein levels. Moreover, we confirmed the involvement of OS as a toxicity process for cinnamon-flavored e-cig aerosol by pre-treating the cells with N-acetyl cysteine (NAC), an antioxidant that prevented the cells from the OS-mediated damage induced by the e-cig aerosol. CONCLUSION The production of high levels of carbonyls may be flavor specific. Overall, inhaling e-cig aerosols produced under 'sub-ohm' conditions is detrimental to lung epithelial cells, potentially via mechanisms associated with OS. This information could help policymakers take the necessary steps to prevent the manufacturing of sub-ohm atomizers for e-cig devices.
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Affiliation(s)
- Alexandra Noël
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA.
| | - Ekhtear Hossain
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
| | - Zakia Perveen
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
| | - Hasan Zaman
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
| | - Arthur L Penn
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, 1909 Skip Bertman Drive, Baton Rouge, LA, 70803, USA
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Destaillats H, Singer B, Salthammer T. Does vaping affect indoor air quality? INDOOR AIR 2020; 30:793-794. [PMID: 32851691 DOI: 10.1111/ina.12663] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 03/03/2020] [Indexed: 06/11/2023]
Affiliation(s)
- Hugo Destaillats
- Indoor Environment Group, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Brett Singer
- Indoor Environment Group, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Tunga Salthammer
- Material Analysis and Indoor Chemistry, Fraunhofer WKI, Braunschweig, Germany
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BEYAZÇİÇEK Ö, BEYAZÇİÇEK E, ÖZMERDİVENLİ R, DEMİR S. E-sigaralar: Yeni Bir Fenomen. DÜZCE ÜNIVERSITESI SAĞLIK BILIMLERI ENSTITÜSÜ DERGISI 2020. [DOI: 10.33631/duzcesbed.748056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Development and testing of a new-generation aerosol exposure system: The independent holistic air-liquid exposure system (InHALES). Toxicol In Vitro 2020; 67:104909. [PMID: 32512146 DOI: 10.1016/j.tiv.2020.104909] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 05/20/2020] [Accepted: 06/02/2020] [Indexed: 11/21/2022]
Abstract
The dose of inhaled materials delivered to the respiratory tract is to a large extent a function of the kinetics of particle deposition and gas dissolution on or in the airway and lung epithelia, and therefore of the structural and functional properties of the respiratory tract. In vitro aerosol exposure systems commonly do not simulate these properties, which may result in the delivery of non-realistic, non-human-relevant doses of inhalable test substances to the in vitro biological test systems. We developed a new-generation in vitro aerosol exposure system, the InHALES, that can, like the human respiratory tract, actively breathe, operate medical inhalers, or take puffs from tobacco products. Due to its structural and functional similarity to the human respiratory tract, the system is expected to deliver human-relevant doses of inhalable materials to cell cultures representing respiratory tract epithelia. We here describe the proof of concept of the InHALES with respect to aerosol delivery and compatibility with oral, bronchial, and alveolar cell cultures. The results indicate that the system structure and function translate into complex patterns of test atmosphere delivery that, with increasing system complexity, may closely mimic the patterns observable in the human respiratory tract.
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Vaping-Related Acute Parenchymal Lung Injury: A Systematic Review. Chest 2020; 158:1555-1565. [PMID: 32442559 DOI: 10.1016/j.chest.2020.03.085] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 03/25/2020] [Accepted: 03/27/2020] [Indexed: 12/12/2022] Open
Abstract
The outbreak of vaping-related acute lung injury in the United States, named EVALI (e-cigarette or vaping product use associated acute lung injury), has reignited concerns about the health effects of vaping. Initial case reports of vaping-related lung injury date back to 2012, but the ongoing outbreak of EVALI began in the summer of 2019 and has been implicated in 2,807 cases and 68 deaths as of this writing. Review of the scientific literature revealed 216 patient cases that spanned 41 reports of parenchymal lung injury attributed to vaping. In this review, we detail the clinical, radiographic, and pathologic patterns of lung injury that are attributable to vaping and provide an overview of the scientific literature to date on the effects of vaping on respiratory health. Tetrahydrocannabinol was the most commonly vaped substance, and vitamin E acetate was found in BAL specimens from many affected individuals. However, no specific component or contaminant has been identified conclusively to date as the cause for the injury. Patients present with cough, dyspnea, constitutional symptoms, and GI symptoms. Radiologic and histopathologic findings demonstrate a spectrum of nonspecific acute injury patterns. A high index of suspicion combined with a good history are the keys to an accurate diagnosis. Treatment is supportive; the mortality rate is low, and most patients recover. Corticosteroids have been used with apparent success in patients with severe disease, but more rigorous studies are needed to clarify their role in the treatment of vaping-related lung injury.
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Traboulsi H, Cherian M, Abou Rjeili M, Preteroti M, Bourbeau J, Smith BM, Eidelman DH, Baglole CJ. Inhalation Toxicology of Vaping Products and Implications for Pulmonary Health. Int J Mol Sci 2020; 21:E3495. [PMID: 32429092 PMCID: PMC7278963 DOI: 10.3390/ijms21103495] [Citation(s) in RCA: 56] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 04/28/2020] [Accepted: 05/12/2020] [Indexed: 12/17/2022] Open
Abstract
E-cigarettes have a liquid that may contain flavors, solvents, and nicotine. Heating this liquid generates an aerosol that is inhaled into the lungs in a process commonly referred to as vaping. E-cigarette devices can also contain cannabis-based products including tetrahydrocannabinol (THC), the psychoactive component of cannabis (marijuana). E-cigarette use has rapidly increased among current and former smokers as well as youth who have never smoked. The long-term health effects are unknown, and emerging preclinical and clinical studies suggest that e-cigarettes may not be harmless and can cause cellular alterations analogous to traditional tobacco smoke. Here, we review the historical context and the components of e-cigarettes and discuss toxicological similarities and differences between cigarette smoke and e-cigarette aerosol, with specific reference to adverse respiratory outcomes. Finally, we outline possible clinical disorders associated with vaping on pulmonary health and the recent escalation of acute lung injuries, which led to the declaration of the vaping product use-associated lung injury (EVALI) outbreak. It is clear there is much about vaping that is not understood. Consequently, until more is known about the health effects of vaping, individual factors that need to be taken into consideration include age, current and prior use of combustible tobacco products, and whether the user has preexisting lung conditions such as asthma and chronic obstructive pulmonary disease (COPD).
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Affiliation(s)
- Hussein Traboulsi
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (H.T.); (M.A.R.); (M.P.); (J.B.); (B.M.S.)
| | - Mathew Cherian
- Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada; (M.C.); (D.H.E.)
| | - Mira Abou Rjeili
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (H.T.); (M.A.R.); (M.P.); (J.B.); (B.M.S.)
- Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montreal, QC H4A 3J1, Canada
| | - Matthew Preteroti
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (H.T.); (M.A.R.); (M.P.); (J.B.); (B.M.S.)
- Department of Pathology, McGill University, Montreal, QC H3A 2B4, Canada
| | - Jean Bourbeau
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (H.T.); (M.A.R.); (M.P.); (J.B.); (B.M.S.)
- Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montreal, QC H4A 3J1, Canada
| | - Benjamin M. Smith
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (H.T.); (M.A.R.); (M.P.); (J.B.); (B.M.S.)
- Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada; (M.C.); (D.H.E.)
- Respiratory Epidemiology and Clinical Research Unit, McGill University Health Centre, Montreal, QC H4A 3J1, Canada
| | - David H. Eidelman
- Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada; (M.C.); (D.H.E.)
| | - Carolyn J. Baglole
- Research Institute of the McGill University Health Centre, Montreal, QC H4A 3J1, Canada; (H.T.); (M.A.R.); (M.P.); (J.B.); (B.M.S.)
- Department of Medicine, McGill University, Montreal, QC H4A 3J1, Canada; (M.C.); (D.H.E.)
- Department of Pathology, McGill University, Montreal, QC H3A 2B4, Canada
- Department of Pharmacology and Therapeutics, McGill University, Montreal, QC H3G 1Y6, Canada
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Madureira J, Slezakova K, Silva AI, Lage B, Mendes A, Aguiar L, Pereira MC, Teixeira JP, Costa C. Assessment of indoor air exposure at residential homes: Inhalation dose and lung deposition of PM 10, PM 2.5 and ultrafine particles among newborn children and their mothers. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 717:137293. [PMID: 32092813 DOI: 10.1016/j.scitotenv.2020.137293] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 01/28/2020] [Accepted: 02/11/2020] [Indexed: 06/10/2023]
Abstract
Accurate assessment of particulate matter (PM) dose and respiratory deposition is essential to better understand the risks of exposure to PM and, consequently, to develop the respective risk-control strategies. In homes, this is especially relevant in regards to ultrafine particles (UFP; <0.1 μm) which origin in these environments is mostly due to indoor sources. Thus, this study aimed to estimate inhalation doses for different PM mass/number size fractions (i.e., PM10, PM2.5 and UFP) in indoor air of residential homes and to quantify the deposition (total, regional and lobar) in human respiratory tract for both newborn children and mothers. Indoor real-time measurements of PM10, PM2.5 and UFP were conducted in 65 residential homes situated in Oporto metropolitan area (Portugal). Inhalation doses were estimated based on the physical characteristics of individual subjects and their activity patterns. The multi-path particle dosimetry model was used to quantify age-specific depositions in human respiratory tract. The results showed that 3-month old infants exhibited 4-fold higher inhalation doses than their mothers. PM10 were primarily deposited in the head region (87%), while PM2.5 and UFP depositions mainly occurred in the pulmonary area (39% and 43%, respectively). Subject age affected the pulmonary region and the total lung deposition; higher deposition being observed among the newborns. Similarly, lower lobes (left lobe: 37% and right lobe: 30%) received higher PM deposition than upper and middle lobes; right lobes lung are prone to be more susceptible to respiratory problems, since asymmetric deposition was observed. Considering that PM-related diseases occur at specific sites of respiratory system, quantification of site-specific particle deposition should be predicted in order to better evidence the respective health outcomes resulting from inhaled PM.
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Affiliation(s)
- Joana Madureira
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal; EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas 135, 4050-600 Porto, Portugal.
| | - Klara Slezakova
- LEPABE, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
| | - Ana Inês Silva
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal; EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas 135, 4050-600 Porto, Portugal; ICBAS-Institute of Biomedical Sciences Abel Salazar, U. Porto-University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal
| | - Bruna Lage
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal; EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas 135, 4050-600 Porto, Portugal
| | - Ana Mendes
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal; EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas 135, 4050-600 Porto, Portugal
| | - Lívia Aguiar
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal
| | - Maria Carmo Pereira
- LEPABE, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
| | - João Paulo Teixeira
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal; EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas 135, 4050-600 Porto, Portugal
| | - Carla Costa
- Environmental Health Department, National Institute of Health, Rua Alexandre Herculano, 321, 4000-055 Porto, Portugal; EPIUnit - Instituto de Saúde Pública, Universidade do Porto, Rua das Taipas 135, 4050-600 Porto, Portugal
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Mikheev VB, Buehler SS, Brinkman MC, Granville CA, Lane TE, Ivanov A, Cross KM, Clark PI. The Application of Commercially Available Mobile Cigarette Topography Devices for E-cigarette Vaping Behavior Measurements. Nicotine Tob Res 2020; 22:681-688. [PMID: 30215774 PMCID: PMC7171281 DOI: 10.1093/ntr/nty190] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 09/08/2018] [Indexed: 11/14/2022]
Abstract
INTRODUCTION The ability to reliably measure real-world vaping behavior is critical to understand exposures to potential toxins. Commercially available mobile topography devices were originally designed to measure cigarette puffing behavior. Information regarding how applicable these devices are to the measurement of electronic cigarette (e-cigarette) vaping topography is needed. METHODS Clinical Research Support System (CReSS; Pocket) and Smoking Puff Analyzer Mobile (SPA-M) topography devices were tested against the calibrated laboratory-based smoking puff analyzer duplicator (SPA-D) device combined with an analytical smoking machine that generates programmable puffs with high precision. Puff topography of e-cigarettes was measured over a range of puff volumes (10-130 mL) at 2 and 5 s puff durations (using bell- and square-shaped puffs). "Real-world" topography data collected from 10 participants during 1 week of at-home vaping were also analyzed. Recording anomalies and limitations of the devices, such as accuracy of detection of the puff end, flow rate dropouts, unreported puffs, and abandoned vaping sessions for the CReSS, and multi-peak puffs for the SPA-M were defined. RESULTS The accuracy of puff volumes and durations was determined for both devices. The error for SPA-M was generally within ±10%, whereas that for the CReSS varied more widely. The CReSS consistently underestimated puff duration at higher flow rates. CONCLUSIONS CReSS and SPA-M topography devices can be used for real-world e-cigarette topography measurements, but researchers have to be aware of the limitations. Both devices can provide accurate measurements only under certain puff parameter ranges. The SPA-M provided more accurate measurements under a wider range of puffing parameters than the CReSS. Summary data reported by both devices require thorough analysis of the raw data to avoid misleading data interpretation. IMPLICATIONS Results of this study provide researchers with valuable information about the capability of commercially available cigarette topography devices to measure real-world vaping behaviors. The differing measurement ranges of the two devices and puff recording limitations and anomalies should be taken into account during analysis and interpretation of real-world data.
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Affiliation(s)
| | | | | | | | - Timothy E Lane
- Battelle Public Health Center for Tobacco Research, Columbus, OH
| | - Alexander Ivanov
- Battelle Public Health Center for Tobacco Research, Columbus, OH
| | - Kandice M Cross
- Battelle Public Health Center for Tobacco Research, Columbus, OH
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Shao XM, Friedman TC. Last Word on Viewpoint: pH Buffer capacity and pharmacokinetics: two remaining questions. J Appl Physiol (1985) 2020; 128:1063-1064. [PMID: 32284007 PMCID: PMC7276929 DOI: 10.1152/japplphysiol.00165.2020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 03/06/2020] [Indexed: 11/22/2022] Open
Affiliation(s)
- Xuesi M Shao
- Department of Internal Medicine, Charles R. Drew University of Medicine and Science, Los Angeles, California
- David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California
| | - Theodore C Friedman
- Department of Internal Medicine, Charles R. Drew University of Medicine and Science, Los Angeles, California
- David Geffen School of Medicine at University of California, Los Angeles, Los Angeles, California
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Jia S, Zhang Q, Sarkar S, Mao J, Hang J, Chen W, Wang X, Yuan L, Yang L, Ye G, Zhou S. Size-segregated deposition of atmospheric elemental carbon (EC) in the human respiratory system: A case study of the Pearl River Delta, China. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 708:134932. [PMID: 31784178 DOI: 10.1016/j.scitotenv.2019.134932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Revised: 10/10/2019] [Accepted: 10/10/2019] [Indexed: 06/10/2023]
Abstract
It has increasingly become apparent in recent years that atmospheric elemental carbon (EC) is potentially a more sensitive indicator of human health risks from ambient aerosol exposure compared to particulate mass. However, a comprehensive evaluation of the factors affecting EC exposure is lacking so far. To address this, we performed measurements of size-segregated EC in Guangzhou, China, followed by an estimation of deposition in the human respiratory system. Most ambient EC was in the fine mode suggesting significant cloud processing, and ~40% was deposited in the human respiratory tract, with predominant deposition in the head region (47%), followed by the pulmonary (30%) and tracheobronchial (23%) regions. A significant fraction (36%) of deposited EC were coarse particles indicating the need to consider coarse-mode EC in future health effect studies. Infants and children exhibited greater vulnerability to EC exposure than adults, and the deposition amount varied linearly with breathing rate, a proxy for physical exertion. The nature of breathing was found to constrain EC inhalation significantly, with oronasal breathing associated with lower total deposition and nasal breathing leading to lower deposition in the tracheobronchial and pulmonary regions. Overall, these observations strengthen the need to include EC as an additional air quality indicator.
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Affiliation(s)
- Shiguo Jia
- School of Atmospheric Sciences, & Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, P. R. China; Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519000, P.R. China
| | - Qi Zhang
- School of Atmospheric Sciences, & Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Sayantan Sarkar
- Department of Earth Sciences, and Centre for Climate and Environmental Studies, Indian Institute of Science Education and Research (IISER) - Kolkata, Nadia 741246, West Bengal, India
| | - Jingying Mao
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 510632, PR China
| | - Jian Hang
- School of Atmospheric Sciences, & Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, P. R. China; Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519000, P.R. China
| | - Weihua Chen
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 510632, PR China
| | - Xuemei Wang
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 510632, PR China.
| | - Luan Yuan
- Guangdong Environmental Monitoring Center, Guangzhou 510308, PR China
| | - Liming Yang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 117576, Singapore
| | - Guanqiong Ye
- Ocean College, Zhejiang University, Zhoushan 316021, PR China
| | - Shengzhen Zhou
- School of Atmospheric Sciences, & Guangdong Province Key Laboratory for Climate Change and Natural Disaster Studies, Sun Yat-sen University, Guangzhou 510275, P. R. China; Southern Laboratory of Ocean Science and Engineering (Guangdong, Zhuhai), Zhuhai 519000, P.R. China.
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Son Y, Mainelis G, Delnevo C, Wackowski OA, Schwander S, Meng Q. Investigating E-Cigarette Particle Emissions and Human Airway Depositions under Various E-Cigarette-Use Conditions. Chem Res Toxicol 2020; 33:343-352. [PMID: 31804072 PMCID: PMC7301609 DOI: 10.1021/acs.chemrestox.9b00243] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
E-cigarette use is dramatically increasing, particularly with adolescents. While the chemical composition of e-liquids and e-vapor is well characterized, the particle size distribution and the human airways deposition patterns of e-cigarette particles are understudied and poorly understood despite their likely contribution to adverse health effects from e-cigarette usage. In this study, we examined the impacts of e-cigarette device power, e-liquid composition, and vaping topography on e-cigarette particle sizes and their deposition in human airways. In addition, we observed that particle measurement conditions (dilution ratio, temperature, and humidity) significantly affect measured e-cigarette particle sizes. E-cigarette power output significantly increased particle count median diameters (CMD) from 174 ± 13 (particles generated under 6.4 W) to 236 ± 14 nm (particles generated under 31.1 W). E-cigarette particles generated from propylene glycol-based e-liquids (CMD = 145 ± 8 nm and mass median diameter [MMD] = 3.06 ± 0.17 μm) were smaller than those generated from vegetable glycerin-based e-liquids (CMD = 182 ± 9 nm and MMD = 3.37 ± 0.21 μm). Puff volume also impacted vapor particle size: CMD and MMD were 154 ± 11 nm and 3.50 ± 0.27 μm, 163 ± 6 nm and 3.35 ± 0.24 μm, and 146 ± 12 nm and 2.95 ± 0.14 μm, respectively, for 35, 90, and 170 mL puffs. Estimated e-cigarette particle mass deposition fractions in tracheobronchial and bronchoalveolar regions were 0.504-0.541 and 0.073-0.306, respectively. Interestingly, e-cigarette particles are smaller than the particles generated from cigarette smoking but have similar human airway deposition patterns.
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Affiliation(s)
- Yeongkwon Son
- Department of Environmental and Occupational Health, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, United States
- Division of Atmospheric Sciences, Desert Research Institute, Reno, Nevada 89512, United States
| | - Gediminas Mainelis
- Department of Environmental Sciences, Rutgers University, New Brunswick, New Jersey 08901, United States
| | - Cristine Delnevo
- Center for Tobacco Studies, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, United States
- Cancer Prevention & Control Program, Cancer Institute of New Jersey, Rutgers University, New Brunswick, New Jersey 08901, United States
| | - Olivia A. Wackowski
- Center for Tobacco Studies, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, United States
- Cancer Prevention & Control Program, Cancer Institute of New Jersey, Rutgers University, New Brunswick, New Jersey 08901, United States
| | - Stephan Schwander
- Department of Environmental and Occupational Health, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, United States
- Center for Tobacco Studies, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, United States
- Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854, United States
- Department of Urban-Global Public Health, School of Public Health, Rutgers University, Newark, New Jersey 07102, United States
| | - Qingyu Meng
- Department of Environmental and Occupational Health, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, United States
- Center for Tobacco Studies, School of Public Health, Rutgers University, Piscataway, New Jersey 08854, United States
- Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854, United States
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Prediction of Aerosol Deposition in the Human Respiratory Tract via Computational Models: A Review with Recent Updates. ATMOSPHERE 2020. [DOI: 10.3390/atmos11020137] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The measurement of deposited aerosol particles in the respiratory tract via in vivo and in vitro approaches is difficult due to those approaches’ many limitations. In order to overcome these obstacles, different computational models have been developed to predict the deposition of aerosol particles inside the lung. Recently, some remarkable models have been developed based on conventional semi-empirical models, one-dimensional whole-lung models, three-dimensional computational fluid dynamics models, and artificial neural networks for the prediction of aerosol-particle deposition with a high accuracy relative to experimental data. However, these models still have some disadvantages that should be overcome shortly. In this paper, we take a closer look at the current research trends as well as the future directions of this research area.
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43
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Benam KH, Novak R, Ferrante TC, Choe Y, Ingber DE. Biomimetic smoking robot for in vitro inhalation exposure compatible with microfluidic organ chips. Nat Protoc 2020; 15:183-206. [PMID: 31925401 DOI: 10.1038/s41596-019-0230-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 07/24/2019] [Indexed: 01/22/2023]
Abstract
Exposure of lung tissues to cigarette smoke is a major cause of human disease and death worldwide. Unfortunately, adequate model systems that can reliably recapitulate disease biogenesis in vitro, including exposure of the human lung airway to fresh whole cigarette smoke (WCS) under physiological breathing airflow, are lacking. This protocol extension builds upon, and can be used with, our earlier protocol for microfabrication of human organs-on-chips. Here, we describe the engineering, assembly and operation of a microfluidically coupled, multi-compartment platform that bidirectionally 'breathes' WCS through microchannels of a human lung small airway microfluidic culture device, mimicking how lung cells may experience smoke in vivo. Several WCS-exposure systems have been developed, but they introduce smoke directly from above the cell cultures, rather than tangentially as naturally occurs in the lung due to lateral airflow. We detail the development of an organ chip-compatible microrespirator and a smoke machine to simulate breathing behavior and smoking topography parameters such as puff time, inter-puff interval and puffs per cigarette. Detailed design files, assembly instructions and control software are provided. This novel platform can be fabricated and assembled in days and can be used repeatedly. Moderate to advanced engineering and programming skills are required to successfully implement this protocol. When coupled with the small airway chip, this protocol can enable prediction of patient-specific biological responses in a matched-comparative manner. We also demonstrate how to adapt the protocol to expose living ciliated airway epithelial cells to smoke generated by electronic cigarettes (e-cigarettes) on-chip.
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Affiliation(s)
- Kambez H Benam
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, USA.,Division of Pulmonary Sciences and Critical Care Medicine, Departments of Medicine and Bioengineering, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
| | - Richard Novak
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, USA
| | - Thomas C Ferrante
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, USA
| | - Youngjae Choe
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, USA
| | - Donald E Ingber
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, USA. .,Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA, USA. .,Vascular Biology Program and Department of Surgery, Boston Children's Hospital and Harvard Medical School, Boston, MA, USA.
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Li L, Lee ES, Nguyen C, Zhu Y. Effects of propylene glycol, vegetable glycerin, and nicotine on emissions and dynamics of electronic cigarette aerosols. AEROSOL SCIENCE AND TECHNOLOGY : THE JOURNAL OF THE AMERICAN ASSOCIATION FOR AEROSOL RESEARCH 2020; 54:1270-1281. [PMID: 33116348 PMCID: PMC7590927 DOI: 10.1080/02786826.2020.1771270] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 05/09/2020] [Accepted: 05/12/2020] [Indexed: 05/17/2023]
Abstract
An electronic cigarette (e-cig) generates aerosols by vaporizing the e-liquid, which mainly consists of propylene glycol (PG), vegetable glycerin (VG), and nicotine. Understanding the effects of e-liquid main compositions on e-cig aerosols is important for exposure assessment. This study investigated how the PG/VG ratio and nicotine content affect e-cig aerosol emissions and dynamics. A tank-based e-cig device with 10 different flavorless e-liquid mixtures (e.g., PG/VG ratios of 0/100, 10/90, 30/70, 50/50, and 100/0 with 0.0% or 2.4% nicotine) was used to puff aerosols into a 0.46 m3 stainless steel chamber for 0.5 h. Real-time measurements of particle number concentration (PNC), fine particulate matter (PM2.5), and particle size distributions were conducted continuously throughout the puffing and the following 2-h decay period. During the decay period, particle loss rates were determined by a first-order log-linear regression and used to calculate the emission factor. The addition of nicotine in the e-liquid significantly decreased the particle number emission factor by 33%. The PM2.5 emission factor significantly decreased with greater PG content in the e-liquid. For nicotine-free e-liquids, increasing the PG/VG ratio resulted in increased particle loss rates measured by PNC and PM2.5. This pattern was not observed with nicotine in the e-liquids. The particle loss rates, however, were significantly different with and without nicotine especially when the PG/VG ratios were greater than 30/70. Compared with nonvolatile diethyl-hexyl subacute (DEHS) aerosols, e-cig particle concentration decayed faster inside the chamber, presumably due to evaporation. These results have potential implications for assessing human exposure to e-cig aerosols.
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Affiliation(s)
- Liqiao Li
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, California, USA
| | - Eon S Lee
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, California, USA
| | - Charlene Nguyen
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, California, USA
| | - Yifang Zhu
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, California, USA
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45
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Boué S, Goedertier D, Hoeng J, Iskandar A, Kuczaj AK, Marescotti D, Mathis C, May A, Phillips B, Peitsch MC, Schlage WK, Sciuscio D, Tan WT, Vanscheeuwijck P. State-of-the-art methods and devices for generation, exposure, and collection of aerosols from e-vapor products. TOXICOLOGY RESEARCH AND APPLICATION 2020. [DOI: 10.1177/2397847320979751] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
E-vapor products (EVP) have become popular alternatives for cigarette smokers who would otherwise continue to smoke. EVP research is challenging and complex, mostly because of the numerous and rapidly evolving technologies and designs as well as the multiplicity of e-liquid flavors and solvents available on the market. There is an urgent need to standardize all stages of EVP assessment, from the production of a reference product to e-vapor generation methods and from physicochemical characterization methods to nonclinical and clinical exposure studies. The objective of this review is to provide a detailed description of selected experimental setups and methods for EVP aerosol generation and collection and exposure systems for their in vitro and in vivo assessment. The focus is on the specificities of the product that constitute challenges and require development of ad hoc assessment frameworks, equipment, and methods. In so doing, this review aims to support further studies, objective evaluation, comparison, and verification of existing evidence, and, ultimately, formulation of standardized methods for testing EVPs.
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Affiliation(s)
- Stéphanie Boué
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Didier Goedertier
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Julia Hoeng
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Anita Iskandar
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Arkadiusz K Kuczaj
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Diego Marescotti
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Carole Mathis
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Anne May
- Consultants in Science, Epalinges, Switzerland
| | - Blaine Phillips
- Philip Morris International (PMI) Research & Development, Philip Morris International Research Laboratories Pte. Ltd, Science Park II, Singapore
| | - Manuel C Peitsch
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | | | - Davide Sciuscio
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Wei Teck Tan
- Philip Morris International (PMI) Research & Development, Philip Morris International Research Laboratories Pte. Ltd, Science Park II, Singapore
| | - Patrick Vanscheeuwijck
- Philip Morris International (PMI) Research & Development, Philip Morris Products S.A., Neuchâtel, Switzerland
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46
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Avino P, Rosada A, Manigrasso M. The inorganic fraction in e-liquids used in vapor products including e-cigarettes. J Radioanal Nucl Chem 2019. [DOI: 10.1007/s10967-019-06762-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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47
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Bahmed K, Lin CR, Simborio H, Karim L, Aksoy M, Kelsen S, Tomar D, Madesh M, Elrod J, Messier E, Mason R, Unterwald EM, Eisenstein TK, Criner GJ, Kosmider B. The role of DJ-1 in human primary alveolar type II cell injury induced by e-cigarette aerosol. Am J Physiol Lung Cell Mol Physiol 2019; 317:L475-L485. [PMID: 31313616 PMCID: PMC6842910 DOI: 10.1152/ajplung.00567.2018] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 06/11/2019] [Accepted: 07/07/2019] [Indexed: 01/18/2023] Open
Abstract
The alveolus participates in gas exchange, which can be impaired by environmental factors and toxins. There is an increase in using electronic cigarettes (e-cigarettes); however, their effect on human primary alveolar epithelial cells is unknown. Human lungs were obtained from nonsmoker organ donors to isolate alveolar type II (ATII) cells. ATII cells produce and secrete pulmonary surfactant and restore the epithelium after damage, and mitochondrial function is important for their metabolism. Our data indicate that human ATII cell exposure to e-cigarette aerosol increased IL-8 levels and induced DNA damage and apoptosis. We also studied the cytoprotective effect of DJ-1 against ATII cell injury. DJ-1 knockdown in human primary ATII cells sensitized cells to mitochondrial dysfunction as detected by high mitochondrial superoxide production, decreased mitochondrial membrane potential, and calcium elevation. DJ-1 knockout (KO) mice were more susceptible to ATII cell apoptosis and lung injury induced by e-cigarette aerosol compared with wild-type mice. Regulation of the oxidative phosphorylation (OXPHOS) is important for mitochondrial function and protection against oxidative stress. Major subunits of the OXPHOS system are encoded by both nuclear and mitochondrial DNA. We found dysregulation of OXPHOS complexes in DJ-1 KO mice after exposure to e-cigarette aerosol, which could disrupt the nuclear/mitochondrial stoichiometry, resulting in mitochondrial dysfunction. Together, our results indicate that DJ-1 deficiency sensitizes ATII cells to damage induced by e-cigarette aerosol leading to lung injury.
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Affiliation(s)
- Karim Bahmed
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
| | - Chih-Ru Lin
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
| | - Hannah Simborio
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
| | - Loukmane Karim
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
| | - Mark Aksoy
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
| | - Steven Kelsen
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
| | - Dhanendra Tomar
- Department of Medical Genetics and Molecular Biochemistry, Temple University, Philadelphia, Pennsylvania
| | - Muniswamy Madesh
- Department of Medical Genetics and Molecular Biochemistry, Temple University, Philadelphia, Pennsylvania
| | - John Elrod
- Department of Medical Genetics and Molecular Biochemistry, Temple University, Philadelphia, Pennsylvania
| | - Elise Messier
- Department of Medicine, National Jewish Health, Denver, Colorado
| | - Robert Mason
- Department of Medicine, National Jewish Health, Denver, Colorado
| | - Ellen M Unterwald
- Department of Pharmacology, Center for Substance Abuse Research, Temple University, Philadelphia, Pennsylvania
| | - Toby K Eisenstein
- Department of Microbiology and Immunology, Temple University, Philadelphia, Pennsylvania
- Center for Substance Abuse Research, Temple University, Philadelphia, Pennsylvania
| | - Gerard J Criner
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
| | - Beata Kosmider
- Department of Thoracic Medicine and Surgery, Temple University, Philadelphia, Pennsylvania
- Center for Inflammation, Translational and Clinical Lung Research, Temple University, Philadelphia, Pennsylvania
- Department of Medicine, National Jewish Health, Denver, Colorado
- Department of Physiology, Temple University, Philadelphia, Pennsylvania
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48
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Lechasseur A, Altmejd S, Turgeon N, Buonanno G, Morawska L, Brunet D, Duchaine C, Morissette MC. Variations in coil temperature/power and e-liquid constituents change size and lung deposition of particles emitted by an electronic cigarette. Physiol Rep 2019; 7:e14093. [PMID: 31140749 PMCID: PMC6540444 DOI: 10.14814/phy2.14093] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 04/15/2019] [Accepted: 04/22/2019] [Indexed: 11/24/2022] Open
Abstract
Electronic cigarette uses propylene glycol and glycerol to deliver nicotine and flavors to the lungs. Given the hundreds of different brands, the thousands of flavors available and the variations in nicotine concentrations, it is likely that electronic cigarette settings and e-liquid composition affect the size distribution of particles emitted and ultimately pulmonary deposition. We used the inExpose e-cigarette extension to study two separate modes of operation of electronic cigarettes, namely power-controlled and the temperature-controlled. We also assessed several e-liquids based on propylene glycol and glycerol concentrations, nicotine content, and selected monomolecular flavoring agents (menthol, vanillin, and maltol). Particle size distribution was measured using a Condensation Particle Counter and a Scanning Mobility Particle Sizer spectrometer. Lung deposition was predicted using the International Commission on Radiological Protection model. For all resistance coils, increase in power delivery generated larger particles while maintaining a higher coil temperature generated smaller particles. Increase in glycerol concentration led to the generation of larger particles. With regard to flavors, we showed that despite minor effect of menthol and maltol, vanillin dramatically increased particle size. Presence of nicotine also increased particle size. Finally, particles emitted by the electronic cigarette were predicted to mainly deposit in the alveoli and conditions generating larger particle sizes led to a reduction in predicted lung deposition. This study shows that coil temperature, propylene glycol and glycerol concentrations, presence of nicotine, and flavors affect the size of particles emitted by an electronic cigarette, directly affecting predicted lung deposition of these particles.
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Affiliation(s)
- Ariane Lechasseur
- Quebec Heart and Lung Institute ‐ Université LavalQuebecQuebecCanada
- Faculty of MedicineUniversité LavalQuebecQuebecCanada
| | - Simon Altmejd
- SCIREQ Scientific Respiratory Equipment Inc.MontrealCanada
| | - Natalie Turgeon
- Quebec Heart and Lung Institute ‐ Université LavalQuebecQuebecCanada
| | - Giorgio Buonanno
- University of Cassino and Southern LazioCassinoItaly
- Queensland University of TechnologyBrisbaneAustralia
| | | | - David Brunet
- SCIREQ Scientific Respiratory Equipment Inc.MontrealCanada
| | - Caroline Duchaine
- Quebec Heart and Lung Institute ‐ Université LavalQuebecQuebecCanada
- Departement of Biochemistry, Microbiology and BioinformaticsUniversité LavalQuebecQuebecCanada
| | - Mathieu C. Morissette
- Quebec Heart and Lung Institute ‐ Université LavalQuebecQuebecCanada
- Department de MedicineUniversité LavalQuebecQuebecCanada
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49
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Deepthi Y, Shiva Nagendra SM, Gummadi SN. Characteristics of indoor air pollution and estimation of respiratory dosage under varied fuel-type and kitchen-type in the rural areas of Telangana state in India. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 650:616-625. [PMID: 30208347 DOI: 10.1016/j.scitotenv.2018.08.381] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 08/12/2018] [Accepted: 08/26/2018] [Indexed: 05/11/2023]
Abstract
Indoor Air Pollution (IAP) is one of the top environmental risks in developing countries including India, with more than a million deaths annually, predominantly through Particulate Matter (PM) exposure. The current study deals with the measurement of PM concentrations in rural households under varied fuel and kitchen-types, evaluation of the indoor air pollution (IAP) characteristics and estimation of respiratory dosage for the different subjects (women, young children and the elderly). Monitoring of particulate matter (PM) was carried out during summer, monsoon and winter season with biomass, LPG and combine of biomass and LPG being used as fuel for cooking. Furthermore, different types of indoor kitchens (with partition and without partition) and outdoor kitchens (separate enclose kitchen and open kitchen) were also considered as kitchen type along with fuel are two crucial factors contributing to IAP. Deposition fractions were calculated using Multiple Particle Path Dosimetry (MPPD) to study the deposition patterns in different parts of the human respiratory tract (HRT) - head, tracheobronchial and pulmonary for women, young children and the elderly people. Dosage of particulate matter was calculated by inputting the recorded PM measurements, a comparison made for biomass-LPG and dosage intensification due to the kitchen-type presented. While the biomass households exhibited high levels of dosage (1181.4 to 5891.7 μg) against the LPG households (89.9 to 811.2 μg), the indoor kitchen types exhibited a maximum intensification of 10.6 times than outdoor kitchens with the same fuel. This study not only establishes the IAP characteristics but also quantifies the role of fuel-type and kitchen-type in IAP. The study also indicates various measures that could be deployed to reduce dosage and thus minimize the health risks.
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Affiliation(s)
- Yaparla Deepthi
- Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, India
| | - S M Shiva Nagendra
- Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600 036, India.
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50
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Chaumont M, van de Borne P, Bernard A, Van Muylem A, Deprez G, Ullmo J, Starczewska E, Briki R, de Hemptinne Q, Zaher W, Debbas N. Fourth generation e-cigarette vaping induces transient lung inflammation and gas exchange disturbances: results from two randomized clinical trials. Am J Physiol Lung Cell Mol Physiol 2019; 316:L705-L719. [PMID: 30724099 PMCID: PMC6589591 DOI: 10.1152/ajplung.00492.2018] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
When heated by an electronic cigarette, propylene glycol and glycerol produce a nicotine-carrying-aerosol. This hygroscopic/hyperosmolar aerosol can deposit deep within the lung. Whether these deposits trigger local inflammation and disturb pulmonary gas exchanges is not known. The aim of this study was to assess the acute effects of high-wattage electronic cigarette vaping with or without nicotine on lung inflammation biomarkers, transcutaneous gas tensions, and pulmonary function tests in young and healthy tobacco smokers. Acute effects of vaping without nicotine on arterial blood gas tensions were also assessed in heavy smokers suspected of coronary artery disease. Using a single-blind within-subjects study design, 25 young tobacco smokers underwent three experimental sessions in random order: sham-vaping and vaping with and without nicotine at 60 W. Twenty heavy smokers were also exposed to sham-vaping (n = 10) or vaping without nicotine (n = 10) in an open-label, randomized parallel study. In the young tobacco smokers, compared with sham-vaping: 1) serum club cell protein-16 increased after vaping without nicotine (mean ± SE, −0.5 ± 0.2 vs. +1.1 ± 0.3 µg/l, P = 0.013) and vaping with nicotine (+1.2 ± 0.3 µg/l, P = 0.009); 2) transcutaneous oxygen tension decreased for 60 min after vaping without nicotine (nadir, −0.3 ± 1 vs. −15.3 ± 2.3 mmHg, P < 0.001) and for 80-min after vaping with nicotine (nadir, −19.6 ± 2.8 mmHg, P < 0.001). Compared with sham vaping, vaping without nicotine decreased arterial oxygen tension for 5 min in heavy-smoking patients (+5.4 ± 3.3 vs. −5.4 ± 1.9 mmHg, P = 0.012). Acute vaping of propylene glycol/glycerol aerosol at high wattage with or without nicotine induces airway epithelial injury and sustained decrement in transcutaneous oxygen tension in young tobacco smokers. Intense vaping conditions also transiently impair arterial oxygen tension in heavy smokers.
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Affiliation(s)
- Martin Chaumont
- Department of Cardiology, Erasme University Hospital, Université Libre de Bruxelles , Brussels , Belgium
| | - Philippe van de Borne
- Department of Cardiology, Erasme University Hospital, Université Libre de Bruxelles , Brussels , Belgium
| | - Alfred Bernard
- Laboratory of Toxicology and Applied Pharmacology, Institute of Experimental and Clinical Research, Université Catholique de Louvain , Brussels , Belgium
| | - Alain Van Muylem
- Department of Respiratory Medicine, Erasme University Hospital, Université Libre de Bruxelles , Brussels , Belgium
| | - Guillaume Deprez
- Department of Clinical Chemistry, Erasme University Hospital, Université Libre de Bruxelles , Brussels , Belgium
| | - Julien Ullmo
- Department of Cardiology, Erasme University Hospital, Université Libre de Bruxelles , Brussels , Belgium
| | - Eliza Starczewska
- Department of Cardiology, Erasme University Hospital, Université Libre de Bruxelles , Brussels , Belgium
| | - Rachid Briki
- Department of Cardiology, Centre Hospitalier Universitaire Saint-Pierre, Université Libre de Bruxelles , Brussels , Belgium
| | - Quentin de Hemptinne
- Department of Cardiology, Centre Hospitalier Universitaire Saint-Pierre, Université Libre de Bruxelles , Brussels , Belgium
| | - Wael Zaher
- Department of Cardiology, Centre Hospitalier Universitaire Saint-Pierre, Université Libre de Bruxelles , Brussels , Belgium
| | - Nadia Debbas
- Department of Cardiology, Centre Hospitalier Universitaire Saint-Pierre, Université Libre de Bruxelles , Brussels , Belgium
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