1
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Beard JM, Collom C, Liu JY, Obiako P, Strongin RM, Zavala J, Sayes CM. In vitro toxicity and chemical analysis of e-cigarette aerosol produced amid dry hitting. Toxicology 2024; 506:153865. [PMID: 38876198 DOI: 10.1016/j.tox.2024.153865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 06/07/2024] [Accepted: 06/10/2024] [Indexed: 06/16/2024]
Abstract
Dry hitting, a phenomenon produced by e-cigarettes with refillable cartridges when the liquid in the coil is low, is a common occurrence among regular vapers despite being an unintended consequence of the device. This phenomenon's hazard to public health is still unknown and needs further investigation. Lung cells cultured at the air-liquid interface were exposed to vaped aerosol consisting of 3 % w/v ethyl maltol in propylene glycol for three-second puffs every 30 seconds for 80 total puffs with either dry hit or saturated conditions. Cytotoxicity was measured colorimetrically. The thermal degradation of the heating coils and wicks was visualized using scanning electron microscopy. The chemical byproducts in the aerosol were analyzed using proton nuclear magnetic resonance and inductively coupled plasma mass spectrometry. The results revealed a highly significant increase in cytotoxicity from dry hit treatments. Imaging showed thermal decomposition of the cotton wick after dry hitting, which was confirmed by energy dispersive x-ray spectroscopy with less oxygen in the dry hit cotton. Chemical byproducts were found via unique peaks in the dry hit condensate in the aromatic and alkene regions. Saturated condensate showed higher concentrations of detected metal species than dry-hit condensate. E-cigarette users should avoid dry hitting by refilling tanks or cartridges preemptively or by using disposable coils to avoid increased toxicity during vaping.
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Affiliation(s)
- Jonathan M Beard
- Department of Biology, Baylor University, Waco, TX 76798-7266, USA
| | - Clancy Collom
- Department of Environmental Science, Baylor University, Waco, TX 76798-7266, USA
| | - James Y Liu
- Department of Environmental Science, Baylor University, Waco, TX 76798-7266, USA
| | - Precious Obiako
- Department of Environmental Science, Baylor University, Waco, TX 76798-7266, USA
| | - Robert M Strongin
- Department of Chemistry, Portland State University, Portland, OR 97207, USA
| | | | - Christie M Sayes
- Department of Biology, Baylor University, Waco, TX 76798-7266, USA; Department of Environmental Science, Baylor University, Waco, TX 76798-7266, USA.
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2
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Sommer N, Franzen K, Andreas S, Pankow W, Kunstmann W, Hanewinkel R. [Harmful health effects of flavors in e-cigarettes]. Laryngorhinootologie 2024. [PMID: 38996433 DOI: 10.1055/a-2341-0544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2024]
Abstract
BACKGROUND Almost all e-cigarettes contain flavorings that make the product more attractive. In the evaluation of e-cigarettes on health, flavors have so far played a subordinate role. METHOD Selective literature search in PubMed, supplemented by legal regulations on the use of flavors in e-cigarettes. RESULTS Flavors make it easier to start using e-cigarettes and have a consumption-promoting effect. Deeper inhalation increases nicotine uptake and the absorption of toxic substances from the e-cigarette liquid. For some flavors, pathological effects have been demonstrated in addition to other toxic components of the e-cigarette. To date, no toxicological analyses are available for the vast majority of flavors contained in e-cigarettes. CONCLUSIONS The proven consumption-promoting effect and the health risks that can be extrapolated from preclinical data are significant for the political discussion of a ban on flavors for e-cigarettes, analogous to the ban on flavors in tobacco products already in force.
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Affiliation(s)
- Natascha Sommer
- Medizinische Klinik II, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Mitglied des Deutschen Zentrums für Lungenforschung (DZL), Justus-Liebig-Universität Gießen
| | - Klaas Franzen
- Universitätsklinikum Schleswig-Holstein, Medizinische Klinik III, Pneumologie, Campus Lübeck, Airway Research Center North (ARCN), Deutsches Zentrum für Lungenforschung (DZL), Lübeck/Großhansdorf
| | - Stefan Andreas
- Lungenfachklinik Immenhausen, Immenhausen, Klinik für Kardiologie und Pneumologie, Universitätsmedizin Göttingen, Deutsches Zentrum für Lungenforschung
| | - Wulf Pankow
- Philipps-Universität Marburg - Fachbereich Medizin
| | - Wilfried Kunstmann
- IFT-Nord gGmbH, Institut für Therapie- und Gesundheitsforschung, Kiel, Deutschland
| | - Reiner Hanewinkel
- IFT-Nord gGmbH, Institut für Therapie- und Gesundheitsforschung, Kiel, Deutschland
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3
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Walker-Franklin I, Onyenwoke RU, Leung T, Huang X, Shipman JG, Kovach A, Sivaraman V. GC/HRMS Analysis of E-Liquids Complements In Vivo Modeling Methods and can Help to Predict Toxicity. ACS OMEGA 2024; 9:26641-26650. [PMID: 38911720 PMCID: PMC11191570 DOI: 10.1021/acsomega.4c03416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 05/23/2024] [Accepted: 05/27/2024] [Indexed: 06/25/2024]
Abstract
Tobacco smoking is a major risk factor for disease development, with the user inhaling various chemicals known to be toxic. However, many of these chemicals are absent before tobacco is "burned". Similar, detailed data have only more recently being reported for the e-cigarette with regards to chemicals present before and after the e-liquid is "vaped." Here, zebrafish were dosed with vaped e-liquids, while C57-BL/6J mice were vaped using nose-cone only administration. Preliminary assessments were made using e-liquids and GC/HRMS to identify chemical signatures that differ between unvaped/vaped and flavored/unflavored samples. Oxidative stress and inflammatory immune cell response assays were then performed using our in vivo models. Chemical signatures differed, e.g., between unvaped/vaped samples and also between unflavored/flavored e-liquids, with known chemical irritants upregulated in vaped and unvaped flavored e-liquids compared with unflavored e-liquids. However, when possible respiratory irritants were evaluated, these agents were predominantly present in only the vaped e-liquid. Both oxidative stress and inflammatory responses were induced by a menthol-flavored but not a tobacco-flavored e-liquid. Thus, chemical signatures differ between unvaped versus vaped e-liquid samples and also between unflavored versus flavored e-liquids. These flavors also likely play a significant role in the variability of e-liquid characteristics, e.g., pro-inflammatory and/or cytotoxic responses.
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Affiliation(s)
| | - Rob U. Onyenwoke
- Department
of Biological & Biomedical Sciences, North Carolina Central University, Durham, North Carolina 27707, United States
- Biomanufacturing
Research Institute and Technology Enterprise (BRITE), North Carolina Central University, Durham, North Carolina 27707, United States
| | - TinChung Leung
- Department
of Biological & Biomedical Sciences, North Carolina Central University, Durham, North Carolina 27707, United States
- The
Julius L. Chambers Biomedical/Biotechnology Research Institute, North Carolina Central University, North Carolina
Research Campus, Kannapolis, North Carolina 28081, United States
| | - Xiaoyan Huang
- The
Julius L. Chambers Biomedical/Biotechnology Research Institute, North Carolina Central University, North Carolina
Research Campus, Kannapolis, North Carolina 28081, United States
| | - Jeffrey G. Shipman
- Department
of Biological & Biomedical Sciences, North Carolina Central University, Durham, North Carolina 27707, United States
| | - Alex Kovach
- RTI
International, Research
Triangle Park, North Carolina 27704, United States
| | - Vijay Sivaraman
- Department
of Biological & Biomedical Sciences, North Carolina Central University, Durham, North Carolina 27707, United States
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4
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Muthumalage T, Noel A, Thanavala Y, Alcheva A, Rahman I. Challenges in current inhalable tobacco toxicity assessment models: A narrative review. Tob Induc Dis 2024; 22:TID-22-102. [PMID: 38860150 PMCID: PMC11163881 DOI: 10.18332/tid/188197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 04/17/2024] [Accepted: 05/01/2024] [Indexed: 06/12/2024] Open
Abstract
Emerging tobacco products such as electronic nicotine delivery systems (ENDS) and heated tobacco products (HTPs) have a dynamic landscape and are becoming widely popular as they claim to offer a low-risk alternative to conventional smoking. Most pre-clinical laboratories currently exploit in vitro, ex vivo, and in vivo experimental models to assess toxicological outcomes as well as to develop risk-estimation models. While most laboratories have produced a wide range of cell culture and mouse model data utilizing current smoke/aerosol generators and standardized puffing profiles, much variation still exists between research studies, hindering the generation of usable data appropriate for the standardization of these tobacco products. In this review, we discuss current state-of-the-art in vitro and in vivo models and their challenges, as well as insights into risk estimation of novel products and recommendations for toxicological parameters for reporting, allowing comparability of the research studies between laboratories, resulting in usable data for regulation of these products before approval by regulatory authorities.
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Affiliation(s)
| | - Alexandra Noel
- School of Veterinary Medicine Louisiana State University, Baton Rouge, United States
| | - Yasmin Thanavala
- Department of Immunology, Roswell Park Comprehensive Cancer Center, Buffalo, United States
| | - Aleksandra Alcheva
- Division of Environmental Health Sciences, School of Public Health, University of Minnesota, Minneapolis, United States
- Masonic Cancer Center, University of Minnesota, Minneapolis, United States
| | - Irfan Rahman
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, United States
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5
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Sommer N, Franzen K, Andreas S, Pankow W, Kunstmann W, Hanewinkel R. [Harmful health effects of flavors in e-cigarettes]. Dtsch Med Wochenschr 2024; 149:646-653. [PMID: 38458230 DOI: 10.1055/a-2260-5003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/10/2024]
Abstract
BACKGROUND Almost all e-cigarettes contain flavorings that make the product more attractive. In the evaluation of e-cigarettes on health, flavors have so far played a subordinate role. METHOD Selective literature search in PubMed, supplemented by legal regulations on the use of flavors in e-cigarettes. RESULTS Flavors make it easier to start using e-cigarettes and have a consumption-promoting effect. Deeper inhalation increases nicotine uptake and the absorption of toxic substances from the e-cigarette liquid. For some flavors, pathological effects have been demonstrated in addition to other toxic components of the e-cigarette. To date, no toxicological analyses are available for the vast majority of flavors contained in e-cigarettes. CONCLUSIONS The proven consumption-promoting effect and the health risks that can be extrapolated from preclinical data are significant for the political discussion of a ban on flavors for e-cigarettes, analogous to the ban on flavors in tobacco products already in force.
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Affiliation(s)
- Natascha Sommer
- Medizinische Klinik II, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Gießen and Marburg Lung Center (UGMLC), Mitglied des Deutschen Zentrums für Lungenforschung (DZL), Justus-Liebig-Universität Gießen
| | - Klaas Franzen
- Universitätsklinikum Schleswig-Holstein, Medizinische Klinik III, Pneumologie, Campus Lübeck, Airway Research Center North (ARCN), Deutsches Zentrum für Lungenforschung (DZL), Lübeck/Großhansdorf
| | - Stefan Andreas
- Lungenfachklinik Immenhausen, Immenhausen, Klinik für Kardiologie und Pneumologie, Universitätsmedizin Göttingen, Deutsches Zentrum für Lungenforschung
| | - Wulf Pankow
- Philipps-Universität Marburg - Fachbereich Medizin
| | | | - Reiner Hanewinkel
- IFT-Nord gGmbH, Institut für Therapie- und Gesundheitsforschung, Kiel
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Rupp A, Sommer N, Andreas S, Pankow W, Hanewinkel R, Wienbergen H, Batra A, Sauerbruch T, Kardos P, Ulbricht S, Brinkmann F, Scheubel R, Vogelmeier C, Windisch W. [Medical societies in Germany call for a ban on flavors in e-cigarettes - A Position Paper of the German Respiratory Society (DGP) in cooperation with other professional associations and organizations]. Pneumologie 2024; 78:320-324. [PMID: 38503310 DOI: 10.1055/a-2282-9908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
E-cigarettes are primarily used by teenagers and young adults. Flavors in e-cigarettes increase their attractiveness and encourage young people and adults to start using them. This exposes young people in particular to the risk of nicotine addiction and various toxic substances from the aerosol of e-cigarettes. There are indications that various flavors in e-cigarettes are harmful to health, although toxicological studies are still lacking for the majority of flavors. There is a need for independent scientific investigations in this area. The scientific societies involved are calling for a ban on flavors in e-cigarettes, a ban on disposable e-cigarettes, effective regulation of the sale of e-cigarettes and effective control and implementation of the provisions for the protection of minors.
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Affiliation(s)
- Alexander Rupp
- Pneumologische Praxis im Zentrum, Stuttgart, Mitglied der Arbeitsgruppe Tabakprävention und -entwöhnung der DGP, Leiter der Arbeitsgruppe Tabak im Bundesverband der Pneumologie, Schlaf- und Beatmungsmedizin, Stuttgart, Deutschland
| | - Natascha Sommer
- Medizinische Klinik II, Excellence Cluster Cardio-Pulmonary Institute (CPI), Universities of Giessen and Marburg Lung Center (UGMLC), Mitglied des Deutschen Zentrums für Lungenforschung (DZL), Justus-Liebig-Universität Gießen, Gießen, Deutschland
| | - Stefan Andreas
- Lungenfachklinik Immenhausen, Klinik für Kardiologie und Pneumologie, Universitätsmedizin Göttingen, Deutsches Zentrum für Lungenforschung, Göttingen, Deutschland
| | - Wulf Pankow
- Vivantes-Institut für Tabakentwöhnung und Raucherprävention, Berlin, Deutschland
| | - Reiner Hanewinkel
- IFT-Nord gGmbH, Institut für Therapie- und Gesundheitsforschung, Kiel, Deutschland
| | - Harm Wienbergen
- Bremer Institut für Herz- und Kreislaufforschung, Klinikum Links der Weser Bremen, Universität zu Lübeck für die Deutsche Gesellschaft für Kardiologie - Herz- und Kreislaufforschung (DGK), Bremen, Deutschland
| | - Anil Batra
- Universitätsklinik für Psychiatrie und Psychotherapie, Universität Tübingen für die Deutsche Gesellschaft für Psychiatrie und Psychotherapie, Psychosomatik und Nervenheilkunde (DGPPN), Tübingen, Deutschland
| | - Tilman Sauerbruch
- Universität Bonn für die Deutsche Gesellschaft für Innere Medizin (DGIM), Bonn, Deutschland
| | - Peter Kardos
- Lungenzentrum Maingau, Frankfurt a. M. für die Deutsche Atemwegsliga, Frankfurt, Deutschland
| | - Sabina Ulbricht
- Abteilung für Präventionsforschung und Sozialmedizin, Universitätsmedizin Greifswald für das Aktionsbündnis Nichtrauchen, Greifswald, Deutschland
| | - Folke Brinkmann
- Sektion Kinderpneumologie und Allergologie, Klinik für Kinder- und Jugendmedizin, Universitätsklinikum Schleswig-Holstein Campus Lübeck für die Gesellschaft für pädiatrische Pneumologie (GPP), Lübeck, Deutschland
| | - Robert Scheubel
- Klinik für Thoraxchirurgie, Fachkliniken Wangen für die Deutsche Gesellschaft für Thoraxchirurgie, Wangen, Deutschland
| | - Claus Vogelmeier
- Abteilung Pneumologie im Universitätsklinikum Gießen und Marburg, Standort Marburg für die Deutsche Lungenstiftung, Marburg, Deutschland
| | - Wolfram Windisch
- Lungenklinik, Kliniken der Stadt Köln gGmbH, Lehrstuhl für Pneumologie Universität Witten/Herdecke für die Deutsche Gesellschaft für Pneumologie und Beatmungsmedizin, Köln, Deutschland
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Mercier C, Pourchez J, Leclerc L, Forest V. In vitro toxicological evaluation of aerosols generated by a 4th generation vaping device using nicotine salts in an air-liquid interface system. Respir Res 2024; 25:75. [PMID: 38317149 PMCID: PMC10845662 DOI: 10.1186/s12931-024-02697-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Accepted: 01/22/2024] [Indexed: 02/07/2024] Open
Abstract
BACKGROUND Electronic cigarettes (EC) have gained popularity, especially among young people, with the introduction of fourth-generation devices based on e-liquids containing nicotine salts that promise a smoother vaping experience than freebase nicotine. However, the toxicological effects of nicotine salts are still largely unknown, and the chemical diversity of e-liquids limits the comparison between different studies to determine the contribution of each compound to the cytotoxicity of EC aerosols. Therefore, the aim of this study was to evaluate the toxicological profile of controlled composition e-liquid aerosols to accurately determine the effects of each ingredient based on exposure at the air-liquid interface. METHODS Human lung epithelial cells (A549) were exposed to undiluted aerosols of controlled composition e-liquids containing various ratios of propylene glycol (PG)/vegetable glycerin (VG) solvents, freebase nicotine, organic acids, nicotine salts, and flavoured commercial e-liquids. Exposure of 20 puffs was performed at the air-liquid interface following a standard vaping regimen. Toxicological outcomes, including cytotoxicity, inflammation, and oxidative stress, were assessed 24 h after exposure. RESULTS PG/VG aerosols elicited a strong cytotoxic response characterised by a 50% decrease in cell viability and a 200% increase in lactate dehydrogenase (LDH) production, but had no effects on inflammation and oxidative stress. These effects occurred only at a ratio of 70/30 PG/VG, suggesting that PG is the major contributor to aerosol cytotoxicity. Both freebase nicotine and organic acids had no greater effect on cell viability and LDH release than at a 70/30 PG/VG ratio, but significantly increased inflammation and oxidative stress. Interestingly, the protonated form of nicotine in salt showed a stronger proinflammatory effect than the freebase nicotine form, while benzoic acid-based nicotine salts also induced significant oxidative stress. Flavoured commercial e-liquids was found to be cytotoxic at a threshold dose of ≈ 330 µg/cm². CONCLUSION Our results showed that aerosols of e-liquids consisting only of PG/VG solvents can cause severe cytotoxicity depending on the concentration of PG, while nicotine salts elicit a stronger pro-inflammatory response than freebase nicotine. Overall, aerosols from fourth-generation devices can cause different toxicological effects, the nature of which depends on the chemical composition of the e-liquid.
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Affiliation(s)
- Clément Mercier
- Mines Saint-Etienne, Université Jean Monnet, INSERM, U1059 Sainbiose, Centre CIS, Saint-Etienne, 42023, France.
| | - Jérémie Pourchez
- Mines Saint-Etienne, Université Jean Monnet, INSERM, U1059 Sainbiose, Centre CIS, Saint-Etienne, 42023, France
| | - Lara Leclerc
- Mines Saint-Etienne, Université Jean Monnet, INSERM, U1059 Sainbiose, Centre CIS, Saint-Etienne, 42023, France
| | - Valérie Forest
- Mines Saint-Etienne, Université Jean Monnet, INSERM, U1059 Sainbiose, Centre CIS, Saint-Etienne, 42023, France
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Lamb T, Kaur G, Rahman I. Tobacco-derived and tobacco-free nicotine cause differential inflammatory cell influx and MMP-9 in mouse lung. Respir Res 2024; 25:51. [PMID: 38254111 PMCID: PMC10804532 DOI: 10.1186/s12931-023-02662-5] [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: 11/22/2023] [Accepted: 12/29/2023] [Indexed: 01/24/2024] Open
Abstract
BACKGROUND Electronic nicotine delivery systems (ENDS) or electronic cigarettes (e-cigarettes) aerosolize an e-liquid composed of propylene glycol (PG) and vegetable glycerin (VG) as humectants, flavoring chemicals, and nicotine. Nicotine naturally occurs in two isomers R- and S-nicotine, with tobacco-derived nicotine (TDN) composed of S-nicotine, and tobacco-free/synthetic nicotine (TFN) composed of a racemic mixture of R- and S-nicotine. Currently, there is limited knowledge of the potential differences in the toxicity of TFN versus TDN. We hypothesized that exposure of TFN and TDN salts to C57BL/6J mice would result in a differential response in lung inflammation and protease/ antiprotease imbalance. METHODS Five-week-old male and female C57BL/6J mice were exposed to air, PG/VG, PG/VG with TFN salts (TFN), or PG/VG with TDN salts (TDN) by nose-only exposure. Lung inflammatory cell counts, cytokine/chemokine levels, and matrix metalloproteinase (MMP) protein abundance and activity levels were determined by flow cytometry, ELISA, immunoblotting, and gel zymography, respectively. RESULTS Exposure to the humectants (PG/VG) alone increased cytokine levels- IL-6, KC, and MCP-1 in the BALF and KC levels in lung homogenate of exposed mice. While no change was observed in the cytokine levels in lung homogenate of TDN aerosol exposed mice, exposure to TFN aerosols resulted in an increase in KC levels in the lungs of these mice compared to air controls. Interestingly, exposure to TDN aerosols increased MMP-9 protein abundance in the lungs of female mice, while exposure to TFN aerosol showed no change. The metabolism of nicotine or the clearance of cotinine for TFN exposure may differ from that for TDN. CONCLUSION Exposure to humectants, PG/VG alone, induces an inflammatory response in C57BL/6J mice. TFN and TDN salts show distinct changes in inflammatory responses and lung proteases on acute exposures. These data suggest variable toxicological profiles of the two forms of nicotine in vivo. Future work is thus warranted to delineate the harmful effects of synthetic/natural nicotine with humectants to determine the potential toxicological risks for users.
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Affiliation(s)
- Thomas Lamb
- Department of Environmental Medicine, University of Rochester Medical Center, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA
| | - Gagandeep Kaur
- Department of Environmental Medicine, University of Rochester Medical Center, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA
| | - Irfan Rahman
- Department of Environmental Medicine, University of Rochester Medical Center, 601 Elmwood Avenue, Box 850, Rochester, NY, 14642, USA.
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Strongin RM, Sharma E, Erythropel HC, El-Hellani A, Kassem NOF, Mikheev VB, Noël A, Peyton DH, Springer ML. Emerging ENDS products and challenges in tobacco control toxicity research. Tob Control 2023; 33:110-115. [PMID: 35715171 PMCID: PMC9758272 DOI: 10.1136/tobaccocontrol-2022-057268] [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: 01/30/2022] [Accepted: 06/03/2022] [Indexed: 11/04/2022]
Abstract
Electronic nicotine delivery systems (ENDS) continue to rapidly evolve. Current products pose unique challenges and opportunities for researchers and regulators. This commentary aims to highlight research gaps, particularly in toxicity research, and provide guidance on priority research questions for the tobacco regulatory community. Disposable flavoured ENDS have become the most popular device class among youth and may contain higher nicotine levels than JUUL devices. They also exhibit enhanced harmful and potentially harmful constituents production, contain elevated levels of synthetic coolants and pose environmental concerns. Synthetic nicotine and flavour capsules are innovations that have recently enabled the circumvention of Food and Drug Administration oversight. Coil-less ENDS offer the promise of delivering fewer toxicants due to the absence of heating coils, but initial studies show that these products exhibit similar toxicological profiles compared with JUULs. Each of these topic areas requires further research to understand and mitigate their impact on human health, especially their risks to young users.
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Affiliation(s)
| | - Eva Sharma
- Behavioral Health and Health Policy, Westat, Rockville, Maryland, USA
| | - Hanno C Erythropel
- Chemical and Environmental Engineering, Yale University, New Haven, Connecticut, USA
| | - Ahmad El-Hellani
- Center for Tobacco Research and the Division of Environmental Health Sciences, College of Public Health, The Ohio State University, Columbus, Ohio, USA
- Center for the Study of Tobacco Products, Virginia Commonwealth University, Richmond, Virginia, USA
| | - Nada O F Kassem
- Division of Health Promotion and Behavioral Science, San Diego State University Research Foundation, San Diego, California, USA
| | - Vladimir B Mikheev
- Battelle Public Health Center for Tobacco Research, Battelle Memorial Institute, Columbus, Ohio, USA
| | - Alexandra Noël
- Department of Comparative Biomedical Sciences, Louisiana State University, Baton Rouge, Louisiana, USA
| | - David H Peyton
- Chemistry, Portland State University, Portland, Oregon, USA
| | - Matthew L Springer
- Division of Cardiology, Department of Medicine, University of California, San Francisco, San Francisco, California, USA
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10
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Pinkston R, Penn AL, Noël A. Increased oxidative stress responses in murine macrophages exposed at the air-liquid interface to third- and fourth-generation electronic nicotine delivery system (ENDS) aerosols. Toxicol Rep 2023; 11:40-57. [PMID: 37405056 PMCID: PMC10315815 DOI: 10.1016/j.toxrep.2023.06.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 06/06/2023] [Accepted: 06/14/2023] [Indexed: 07/06/2023] Open
Abstract
Background New fourth generation electronic nicotine delivery system (ENDS) devices contain high levels of nicotine salt (up to 60 mg/mL), whose cellular and molecular effects on immune cells are currently unknown. Here, we used a physiologically-relevant in vitro air-liquid interface (ALI) exposure model to assess the toxicity of distinct ENDS, a 3rd-generation electronic-cigarette (e-cig) and two 4th-generation ENDS devices (JUUL and Posh Plus). Methods Murine macrophages (RAW 264.7) were exposed at the ALI to either air, Menthol or Crème Brûlée-flavored ENDS aerosols generated from those devices for 1-hour per day for 1 or 3 consecutive days. Cellular and molecular toxicity was evaluated 24 h post-exposure. Results 1-day of Menthol-flavored JUUL aerosol exposure significantly decreased cell viability and significantly increased lactate dehydrogenase (LDH) levels compared to air controls. Further, JUUL Menthol elicited significantly increased reactive oxygen species (ROS) and nitric oxide (NO) production compared to air controls. Posh Crème Brûlée-flavored aerosols displayed significant cytotoxicity - decreased cell viability and increased LDH levels -after 1- and 3-day exposures, while the Crème Brûlée-flavored aerosol produced by the 3rd-generation e-cig device only displayed significant cytotoxicity after 3 days compared to air controls. Further, both Posh and third-generation e-cig Crème Brûlée flavored-aerosols elicited significantly increased ROS plus high levels of 8-isoprostane after 1 and 3 days compared to air controls, indicating increased oxidative stress. Posh and third-generation e-cig Crème Brûlée flavored-aerosols elicited reduction in NO levels after one day, but elicited increase in NO after 3 days. Genes in common dysregulated by both devices after 1 day included α7nAChR, Cyp1a1, Ahr, Mmp12, and iNos. Conclusion Our results suggest that ENDS Menthol and Crème Brûlée-flavored aerosol exposures from both 3rd- and 4th-generation ENDS devices are cytotoxic to macrophages and cause oxidative stress. This can translate into macrophage dysfunction. Although 4th-generation disposable ENDS devices have no adjustable operational settings and are considered low-powered ENDS devices, their aerosols can induce cellular toxicity compared to air-exposed control cells. This study provides scientific evidence for regulation of nicotine salt-based disposable ENDS products.
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Affiliation(s)
- Rakeysha Pinkston
- Department of Environmental Toxicology, Southern University and A & M College, Baton Rouge, LA 70813, USA
- 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
| | - Alexandra Noël
- 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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11
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Schichlein KD, Love CA, Conolly MP, Kurz JL, Hickman ED, Clapp PW, Jaspers I. Vaping product exposure system (VaPES): a novel in vitro aerosol deposition system. Inhal Toxicol 2023; 35:324-332. [PMID: 38054423 PMCID: PMC10788097 DOI: 10.1080/08958378.2023.2289021] [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: 05/16/2023] [Accepted: 11/20/2023] [Indexed: 12/07/2023]
Abstract
OBJECTIVE Due to recent increases in the use of vaping devices, there is a high demand for research addressing the respiratory health effects of vaping products. Given the constantly changing nature of the vaping market with new devices, flavors, metals, and other chemicals rapidly emerging, there is a need for inexpensive and highly adaptable vaping device exposure systems. Here, we describe the design and validation of a novel in vitro aerosol exposure system for toxicity testing of vaping devices. MATERIALS AND METHODS We developed an inexpensive, open-source in vitro vaping device exposure system that produces even deposition, can be adapted for different vaping devices, and allows for experiments to be performed under physiological conditions. The system was then validated with deposition testing and a representative exposure with human bronchial epithelial cells (hBECs). RESULTS The Vaping Product Exposure System (VaPES) produced sufficient and uniform deposition for dose-response studies and was precise enough to observe biological responses to vaping exposures. VaPES was adapted to work with both pod and cartridge-based vaping devices. CONCLUSION We have designed and validated a novel vaping device exposure system that will eliminate the need to use high-cost commercial exposure systems, lowering the barrier to entry of physiologically relevant vaping studies.
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Affiliation(s)
- Kevin D. Schichlein
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Charlotte A. Love
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Maxwell P. Conolly
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - John L. Kurz
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Elise D. Hickman
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Phillip W. Clapp
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
| | - Ilona Jaspers
- Curriculum in Toxicology & Environmental Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7310, USA
- Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA
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12
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Lamb T, Kaur G, Rahman I. Tobacco-Derived and Tobacco-Free Nicotine cause differential inflammatory cell influx and MMP9 in mouse lung. RESEARCH SQUARE 2023:rs.3.rs-3650978. [PMID: 38077054 PMCID: PMC10705704 DOI: 10.21203/rs.3.rs-3650978/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Electronic nicotine delivery systems (ENDS) or electronic cigarettes (e-cigarettes) have propylene glycol (PG) and vegetable glycerin (VG) as humectants, flavoring chemicals, and nicotine. Nicotine naturally occurs in two isomers R- and S-nicotine, with both tobacco-derived nicotine (TDN) composed of S-nicotine and synthetic nicotine (TFN) composed of a racemic mixture of R- and S-nicotine. Currently there is limited knowledge of the potential differences in the toxicity of TFN vs TDN. We hypothesized that exposure of TFN salts to C57BL/6J mice will result in a differential response in inflammation and lung protease and antiprotease imbalance compared to TDN salts exposed mice. We studied the toxicological impact of these isomers by exposing mice to air, PG/VG, PG/VG with TFN salts, or PG/VG with TDN salts by nose-only exposure and measured the cytokine levels in BALF and lung homogenate along with MMP protein abundance in the lungs of exposed mice. Exposure to the humectants, PG/VG, used in e-cigarettes alone was able to increase cytokine levels-IL-6, KC, and MCP-1 in BALF and KC levels in lung homogenate. Further, it showed differential responses on exposure to PG/VG with TDN salts and PG/VG with TFN salts since PG/VG with TDN salts did not alter the cytokine levels in lung homogenate while PG/VG with TFN salts resulted in an increase in KC levels. PG/VG with TDN salts increased the levels of MMP9 protein abundance in female exposed mice, while PG/VG with TFN salts did not alter MMP9 levels in female mice. The metabolism of nicotine or the clearance of cotinine from TFN may differ from the metabolism of nicotine or the clearance of cotinine from TDN. Thus exposure of humectants alone to induce an inflammatory response while PG/VG with TFN salts and PG/VG with TDN salts may differentially alter inflammatory responses and lung proteases in acute exposures. These data suggest the harmful effects of synthetic/natural nicotine and PG/VG and potential toxicological risk for users.
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13
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Zhao M, Han Y, Yang Q, Yue Q, Zhang S, Zhao C, Sun X, Xu J, Jiang X, Li K, Li B, Zhao L, Su L. Evaluation of the Effects of e-Cigarette Aerosol Extracts and Tobacco Cigarette Smoke Extracts on RAW264.7 Cells. ACS OMEGA 2023; 8:29336-29345. [PMID: 37599962 PMCID: PMC10433514 DOI: 10.1021/acsomega.3c02758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 07/19/2023] [Indexed: 08/22/2023]
Abstract
With the advancement of society, electronic cigarettes (e-cigarettes) have gained popularity among a growing number of individuals. While numerous toxicological studies have suggested that e-cigarettes are a safer alternative to traditional cigarettes, there is also a body of literature presenting contrasting findings. This in vitro study aimed to compare the effects of e-cigarettes and tobacco cigarettes (t-cigarettes) on RAW264.7 cells by using four e-cigarette aerosol extracts (ECA) and cigarette smoking extracts (CS) containing different nicotine concentrations. The results revealed that low concentration of nicotine in CS as well as in ECA with grape, watermelon, and cola flavors could promote cell viability. Conversely, high nicotine concentration in CS and ECA with four flavors decreased cell viability. Furthermore, our study demonstrated that CS significantly reduced the phagocytic capability of RAW264.7 cells and increased the levels of inflammatory cytokines (IL-6, TNF-α, and IL-1β) and reactive oxygen species (ROS) compared to ECA. Overall, our findings indicate all four e-cigarettes induced less cytotoxicity to RAW264.7 cells and might be safer than t-cigarettes.
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Affiliation(s)
- Minghan Zhao
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
| | - Yuting Han
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
| | - Qi Yang
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
| | - Qiulin Yue
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
- Shengshengxiangrong
(Shandong) Biotechnology Co., Ltd., Jinan 250000, P. R. China
| | - Song Zhang
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
| | - Chen Zhao
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
| | - Xin Sun
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
| | - Jing Xu
- Shenzhen
RELX Tech. Co., Ltd., Shenzhen 518000, P. R. China
| | - Xingtao Jiang
- Shenzhen
RELX Tech. Co., Ltd., Shenzhen 518000, P. R. China
| | - Kunlun Li
- Shandong
Zhuoran Biotechnology Co., Ltd., Jinan 250000, P. R. China
| | - Baojun Li
- Shandong
Zhuoran Biotechnology Co., Ltd., Jinan 250000, P. R. China
| | - Lin Zhao
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
- Shandong
Chenzhang Biotechnology Co., Ltd., Jinan 250353, P. R. China
| | - Le Su
- State
Key Laboratory of Biobased Material and Green Papermaking, School
of Bioengineering, Qilu University of Technology,
Shandong Academy of Sciences, Jinan 250353, P. R. China
- Shengshengxiangrong
(Shandong) Biotechnology Co., Ltd., Jinan 250000, P. R. China
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14
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Lamb T, Rahman I. Pro-inflammatory effects of aerosols from e-cigarette-derived flavoring chemicals on murine macrophages. Toxicol Rep 2023; 10:431-435. [PMID: 37090225 PMCID: PMC10119680 DOI: 10.1016/j.toxrep.2023.04.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 03/24/2023] [Accepted: 04/05/2023] [Indexed: 04/08/2023] Open
Abstract
Macrophages treated with the flavoring chemicals found in flavored electronic cigarettes have been shown to induce an inflammatory response, however, limited data are available on the effect of aerosol exposure to these chemicals. We hypothesized that aerosol exposure to flavoring chemicals found in commercially available flavored e-liquids would result in an increase in pro-inflammatory cytokines in macrophages. Raw264.7 macrophage cell lines were exposed to a low and high dose of propylene glycol/vegetable glycerin (PG/VG) with almond flavoring benzaldehyde (280 μg/ml and 2.1 mg/ml), PG/VG with spicy/clove flavoring eugenol (3.5 mg/ml and 12 mg/ml), or PG/VG with apple flavoring hexyl acetate (500 μg/ml and 2.5 mg/ml). Exposure to PG/VG with 2.1 mg/ml benzaldehyde resulted in a significant increase in KC levels compared to air and PG/VG exposed cells. Exposure to PG/VG with both doses of hexyl acetate resulted in a significant increase in KC and IL-6 levels compared to air exposed cells. Exposure to PG/VG with both doses of eugenol resulted in a significant increase in KC and IL-6 levels compared to air and PG/VG exposed cells. These data indicate the ability of aerosol exposure to e-cigarette flavoring chemicals to significantly increase pro-inflammatory cytokine release in macrophages.
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Affiliation(s)
| | - Irfan Rahman
- Correspondence to: Department of Environmental Medicine, University of Rochester Medical Center, Box 850, 601 Elmwood Avenue, Rochester 14642, NY, USA.
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15
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Hua M, Luo W, Khachatoorian C, McWhirter KJ, Leung S, Martinez T, Talbot P. Exposure, Retention, Exhalation, Symptoms, and Environmental Accumulation of Chemicals During JUUL Vaping. Chem Res Toxicol 2023; 36:492-507. [PMID: 36867872 DOI: 10.1021/acs.chemrestox.2c00390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Abstract
Little is known about the chemical exposures that electronic cigarette (EC) users receive and emit during JUUL vaping and if exposures produce symptoms dose dependently. This study examined chemical exposure (dose), retention, symptoms during vaping, and the environmental accumulation of exhaled propylene glycol (PG), glycerol (G), nicotine, and menthol in a cohort of human participants who vaped JUUL "Menthol" ECs. We refer to this environmental accumulation as "EC exhaled aerosol residue" (ECEAR). Chemicals were quantified using gas chromatography/mass spectrometry in JUUL pods before and after use, lab-generated aerosols, human exhaled aerosols, and in ECEAR. Unvaped JUUL "Menthol" pods contained ∼621.3 mg/mL of G, ∼264.9 mg/mL of PG, ∼59.3 mg/mL of nicotine, ∼13.3 mg/mL of menthol, and ∼0.1 mg/mL of the coolant WS-23. Eleven experienced male EC users (aged 21-26) provided exhaled aerosol and residue samples before and after vaping JUUL pods. Participants vaped ad libitum for 20 min, while their average puff count (22 ± 6.4) and puff duration (4.4 ± 2.0) were recorded. The transfer efficiency of nicotine, menthol, and WS-23 from the pod fluid into the aerosol varied with each chemical and was generally similar across flow rates (9-47 mL/s). At 21 mL/s, the average mass of each chemical retained by the participants who vaped 20 min was 53.2 ± 40.3 mg for G, 18.9 ± 14.3 mg for PG, 3.3 ± 2.7 mg for nicotine, and 0.5 ± 0.4 mg for menthol, with retention deduced to be ∼90-100% for each chemical. There was a significant positive relationship between the number of symptoms during vaping and total chemical mass retained. ECEAR accumulated on enclosed surfaces where it could contribute to passive exposure. These data will be valuable to researchers studying human exposure to EC aerosols and agencies that regulate EC products.
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Affiliation(s)
- My Hua
- Environmental Toxicology Graduate Program, University of California, Riverside, Riverside, California 92521, United States
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, Riverside, California 92521, United States
| | - Wentai Luo
- Department of Civil and Environmental Engineering, Portland State University, Portland, Oregon 97201, United States
| | - Careen Khachatoorian
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, Riverside, California 92521, United States
| | - Kevin J McWhirter
- Department of Civil and Environmental Engineering, Portland State University, Portland, Oregon 97201, United States
| | - Sara Leung
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, Riverside, California 92521, United States
| | - Teresa Martinez
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, Riverside, California 92521, United States
| | - Prue Talbot
- Environmental Toxicology Graduate Program, University of California, Riverside, Riverside, California 92521, United States
- Department of Molecular, Cell and Systems Biology, University of California, Riverside, Riverside, California 92521, United States
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16
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Baiden P, Cavazos-Rehg P, Szlyk HS, Onyeaka HK, Peoples JE, Kasson E, Muoghalu C. Association between Sexual Violence Victimization and Electronic Vaping Product Use among Adolescents: Findings from a Population-based Study. Subst Use Misuse 2023; 58:637-648. [PMID: 36803403 PMCID: PMC11177576 DOI: 10.1080/10826084.2023.2177963] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
BACKGROUND Although studies have investigated the association between sexual violence (SV) victimization and substance use, few studies have examined the association between SV victimization and electronic vaping product (EVP) use among adolescents in the United States. The objective of this study was to examine the cross-sectional association between SV victimization and EVP use among adolescents. METHODS Data were pooled from the 2017 and 2019 Youth Risk Behavior Survey. An analytic sample of 28,135 adolescents (51.2% female) was analyzed using binary logistic regression. The outcome variable investigated was EVP use, and the main explanatory variable was SV victimization. RESULTS Of the 28,135 adolescents, the prevalence of past 30-day EVP use and SV victimization was 22.7% and 10.8%, respectively. Controlling for other factors, adolescents who experienced SV had 1.52 times higher odds of being EVP users when compared to their counterparts who did not experience SV (AOR = 1.52, p < .001, 95% CI = 1.27-1.82). Other factors associated with EVP use included cyberbullying victimization, symptoms of depression, and current use of cigarettes, alcohol, and marijuana. CONCLUSIONS Experiencing SV was associated with EVP use. Future studies that employ longitudinal designs may offer more insight into the mechanisms underlying the association between SV victimization and EVP use. In addition, school-based interventions that focus on sexual violence prevention and reducing substance use among adolescents are warranted.
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Affiliation(s)
- Philip Baiden
- School of Social Work, The University of Texas at Arlington, Arlington, Texas, USA
| | - Patricia Cavazos-Rehg
- Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Hannah S. Szlyk
- Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri, USA
| | - Henry K. Onyeaka
- Harvard Medical School, Department of Psychiatry, Boston, Massachusetts, USA
- Department of Psychiatry, Massachusetts General Hospital, Boston, Massachusetts, USA
- Department of Psychiatry, McLean Hospital, Boston, Massachusetts, USA
| | | | - Erin Kasson
- Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri, USA
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17
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Di Cristo L, Sabella S. Cell Cultures at the Air-Liquid Interface and Their Application in Cancer Research. Methods Mol Biol 2023; 2645:41-64. [PMID: 37202611 DOI: 10.1007/978-1-0716-3056-3_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Air-liquid interface (ALI) cell cultures are considered a valid tool for the replacement of animals in biomedical research. By mimicking crucial features of the human in vivo epithelial barriers (e.g., lung, intestine, and skin), ALI cell cultures enable proper structural architectures and differentiated functions of normal and diseased tissue barriers. Thereby, ALI models realistically resemble tissue conditions and provide in vivo-like responses. Since their implementation, they are routinely used in several applications, from toxicity testing to cancer research, receiving an appreciable level of acceptance (in some cases a regulatory acceptance) as attractive testing alternatives to animals. In this chapter, an overview of the ALI cell cultures will be presented together with their application in cancer cell culture, highlighting the potential advantages and disadvantages of the model.
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Affiliation(s)
- Luisana Di Cristo
- D3 PharmaChemistry, Nanoregulatory Group, Italian Institute of Technology, Genoa, Italy.
| | - Stefania Sabella
- D3 PharmaChemistry, Nanoregulatory Group, Italian Institute of Technology, Genoa, Italy
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18
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Baiden P, Spoor SP, Nicholas JK, Brown FA, LaBrenz CA, Spadola C. Association between use of electronic vaping products and insufficient sleep among adolescents: Findings from the 2017 and 2019 YRBS. Sleep Med 2023; 101:19-27. [PMID: 36334497 DOI: 10.1016/j.sleep.2022.10.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 09/13/2022] [Accepted: 10/10/2022] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND OBJECTIVE Although studies have investigated the association between cigarette smoking and sleep outcomes among adolescents in the United States, few studies have examined the association between electronic vaping products (EVPs) use and insufficient sleep among adolescents. The objective of this study was to investigate the cross-sectional association between the use of EVPs and insufficient sleep among adolescents. METHODS Data were pooled from the 2017 and 2019 Youth Risk Behavior Survey. An analytic sample of 28,135 adolescents (51.2% female) was analyzed using binary logistic regression. The dependent variable investigated was insufficient sleep, and the main independent variable was the use of EVPs. RESULTS Of the 28,135 adolescents, 22.6%, 19.2%, and 58.2% were current, former, and never users of EVPs, respectively. More than three in four adolescents (76.5%) did not obtain the recommended 8 h of sleep on an average school night. Controlling for demographic factors and other covariates, adolescents who currently used EVPs had 1.33 times higher odds of having insufficient sleep (AOR = 1.33, p < .001, 95% CI = 1.16-1.52), and adolescents who previously used EVPs had 1.29 times higher odds of having insufficient sleep (AOR = 1.29, p < .001, 95% CI = 1.15-1.44) when compared to adolescents who had never used EVPs. Adolescents were more likely to get insufficient sleep if they were older, non-Hispanic Black, had symptoms of depression, experienced suicidal ideation, engaged in excessive screen-time behaviors, or currently used alcohol. Physical activity had a protective effect on insufficient sleep. CONCLUSION This study found that EVPs use was associated with insufficient sleep among adolescents over and above demographic and other covariates. As EVP use increases among adolescents, it is important to consider the potential impact on multiple domains, including sleep. Future studies that employ longitudinal designs may offer additional insight into the mechanisms underlying the association between EVPs use and insufficient sleep.
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Affiliation(s)
- Philip Baiden
- The University of Texas at Arlington, School of Social Work, 211 S. Cooper St, Box 19129, Arlington, TX, 76019, USA.
| | - Samantha P Spoor
- University of Wyoming, Department of Psychology, 1000 E. University Ave, Laramie, WY, 82071, USA
| | - Julia K Nicholas
- University of Louisville, Department of Psychological and Brain Sciences, Room 307 Life Sciences Building, Louisville, KY, 40292, USA
| | - Fawn A Brown
- The University of Texas at Arlington, Department of Psychology, 501 Nedderman Dr, Box 19528, Arlington, TX, 76019, USA
| | - Catherine A LaBrenz
- The University of Texas at Arlington, School of Social Work, 211 S. Cooper St, Box 19129, Arlington, TX, 76019, USA
| | - Christine Spadola
- The University of Texas at Arlington, School of Social Work, 211 S. Cooper St, Box 19129, Arlington, TX, 76019, USA
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19
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Noël A, Ghosh A. Carbonyl Profiles of Electronic Nicotine Delivery System (ENDS) Aerosols Reflect Both the Chemical Composition and the Numbers of E-Liquid Ingredients-Focus on the In Vitro Toxicity of Strawberry and Vanilla Flavors. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:16774. [PMID: 36554655 PMCID: PMC9779252 DOI: 10.3390/ijerph192416774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/11/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
Propylene glycol (PG) and glycerin (G) are the most widely used humectants in electronic nicotine delivery system (ENDS) devices. Carbonyls are present in aerosols produced when ENDS devices heat PG and G. Whether aerosolized PG and G are innocuous to the lungs has not been established. Here, we determined the chemical profiles of ENDS aerosols containing three humectant ratios (30/70, 50/50 and 70/30, PG/VG), for three flavors (strawberry, vanilla and Catalan cream) containing either 12 or 18 mg/mL of nicotine. Additionally, we examined the in vitro toxicity of the strawberry- and vanilla-flavored ENDS aerosol in human lung epithelial cells (BEAS-2B) exposed at the air-liquid interface for 1 h. For strawberry- and vanilla-flavored aerosols produced by a 3rd-generation ENDS device with the same PG/G ratio, the e-liquid nicotine content of 12 and 18 mg/mL did not transfer to the aerosol with substantial differences in concentrations. Our data also indicate the presence of carbonyls in all three flavored e-cig aerosols analyzed, with levels exceeding 1 µg/puff for acetone, butyraldehyde, and acetaldehyde, in strawberry-, vanilla, and Catalan cream-flavored e-cig aerosols, respectively. Furthermore, closed-system ENDS of the fourth generation emitted trace levels of carbonyls in the aerosols (<0.3 µg/puff), while open-system tank-style ENDS of the third generation produced elevated levels of harmful chemicals, including acrolein (>1 µg/puff), formaldehyde (>5 µg/puff), and m- & p-tolualdehyde (>4 µg/puff). Moreover, under non-cytotoxic conditions, BEAS-2B cells exposed to strawberry-flavored aerosols exhibited significantly increased reactive oxygen and nitric oxide species (ROS/NOS) levels in cell media compared to air controls, while vanilla-flavored ENDS aerosols up-regulated the expression of pro-inflammatory and oxidative stress markers. Our data suggest (a) that ENDS aerosol chemical composition will vary based upon the presence and concentration of the initial e-liquid ingredients, with a pronounced impact of the flavoring components; and (b) short-term exposures to flavored ENDS aerosols may impair lung cells' redox signaling in a flavor-specific manner.
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20
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Effah F, Taiwo B, Baines D, Bailey A, Marczylo T. Pulmonary effects of e-liquid flavors: a systematic review. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2022; 25:343-371. [PMID: 36154615 PMCID: PMC9590402 DOI: 10.1080/10937404.2022.2124563] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Electronic cigarettes (ECs) are purported to be tobacco harm-reduction products whose degree of harm has been highly debated. EC use is considered less hazardous than smoking but is not expected to be harmless. Following the banning of e-liquid flavors in countries such as the US, Finland, Ukraine, and Hungary, there are growing concerns regarding the safety profile of e-liquid flavors used in ECs. While these are employed extensively in the food industry and are generally regarded as safe (GRAS) when ingested, GRAS status after inhalation is unclear. The aim of this review was to assess evidence from 38 reports on the adverse effects of flavored e-liquids on the respiratory system in both in vitro and in vivo studies published between 2006 and 2021. Data collected demonstrated greater detrimental effects in vitro with cinnamon (9 articles), strawberry (5 articles), and menthol (10 articles), flavors than other flavors. The most reported effects among these investigations were perturbations of pro-inflammatory biomarkers and enhanced cytotoxicity. There is sufficient evidence to support the toxicological impacts of diacetyl- and cinnamaldehyde-containing e-liquids following human inhalation; however, safety profiles on other flavors are elusive. The latter may result from inconsistencies between experimental approaches and uncertainties due to the contributions from other e-liquid constituents. Further, the relevance of the concentration ranges to human exposure levels is uncertain. Evidence indicates that an adequately controlled and consistent, systematic toxicological investigation of a broad spectrum of e-liquid flavors may be required at biologically relevant concentrations to better inform public health authorities on the risk assessment following exposure to EC flavor ingredients.
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Affiliation(s)
- Felix Effah
- Pharmacology Section, St George’s University of London, London, UK
- Radiation, Chemical and Environmental Hazards, UK Health Security Agency, Didcot, UK
| | - Benjamin Taiwo
- Physiology Section, St George’s University of London, London, UK
| | - Deborah Baines
- Infection and Immunity Institute, St George’s University of London, London, UK
| | - Alexis Bailey
- Pharmacology Section, St George’s University of London, London, UK
| | - Tim Marczylo
- Radiation, Chemical and Environmental Hazards, UK Health Security Agency, Didcot, UK
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21
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Yogeswaran S, Shaikh SB, Manevski M, Chand HS, Rahman I. The role of synthetic coolants, WS-3 and WS-23, in modulating E-cigarette-induced reactive oxygen species (ROS) in lung epithelial cells. Toxicol Rep 2022; 9:1700-1709. [PMID: 36518479 PMCID: PMC9742959 DOI: 10.1016/j.toxrep.2022.08.007] [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] [Received: 06/20/2022] [Revised: 08/13/2022] [Accepted: 08/17/2022] [Indexed: 11/19/2022] Open
Abstract
There has been a substantial rise in e-cigarette (e-cig) use or vaping in the past decade, prompting growing concerns about their adverse health effects. Recently, e-cig manufacturers have been using synthetic cooling agents, like WS-23 and WS-3, to provide a cooling sensation without the "menthol taste". Studies have shown that aerosols/vapes generated by e-cigs can contain significant levels of reactive oxygen species (ROS). However, studies investigating the role of synthetic coolants in modulating ROS levels generated by e-cigs are lacking. This study seeks to understand how synthetic coolants, e-cig additives that have become increasingly prevalent in e-liquids sold in the United States (US), impact acellular ROS production from e-liquid aerosols as well as cellular ROS levels from pulmonary epithelial cells exposed to these e-liquids. To further explain, our study aims to understand whether the addition of WS-3 and WS-23 to e-liquid base and e-liquid base with nicotine significantly modifies generated acellular ROS levels within aerosolized e-liquids, as well as cellular ROS within BEAS-2B cells treated with these same e-liquids. Aerosols were generated from e-liquids with and without synthetic coolants through a single-puff aerosol generator; subsequently, acellular ROS was semi-quantified in H2O2 equivalents via fluorescence spectroscopy. Our acellular ROS data suggest that adding WS-3 to e-liquid base (PG:VG), regardless of nicotine content, has a minimal impact on modifying e-cig generated acellular ROS levels. Additionally, we also measured cellular ROS in lung epithelial cells using both e-liquids containing and not containing synthetic coolants via the CellROX Green fluorescent sensor. Similar comparable results were found in BEAS2B cells though ROS was increased by WS-3 and WS-23 treated in e-cig nicotine groups. Altogether, our data suggest that neither the addition of WS-23 nor WS-3 to e-liquid base solution, with and without nicotine, significantly modifies e-cig generated acellular ROS levels within aerosolized e-liquids and cellular ROS levels within treated BEAS-2B cells. Together, our data provide insight into whether synthetic coolants added to e-liquids could impact vaping-induced oxidative stress in the lungs.
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Affiliation(s)
- Shaiesh Yogeswaran
- Department of Environmental Medicine, University of Rochester Medical Center, Box 850, 601 Elmwood Avenue, Rochester, NY 14642, USA
| | - Sadiya Bi. Shaikh
- Department of Environmental Medicine, University of Rochester Medical Center, Box 850, 601 Elmwood Avenue, Rochester, NY 14642, USA
| | - Marko Manevski
- Department of Immunology and Nano-Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA
| | - Hitendra S. Chand
- Department of Immunology and Nano-Medicine, Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA
| | - Irfan Rahman
- Department of Environmental Medicine, University of Rochester Medical Center, Box 850, 601 Elmwood Avenue, Rochester, NY 14642, USA
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22
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Omaiye E, Luo W, McWhirter KJ, Pankow JF, Talbot P. Disposable Puff Bar Electronic Cigarettes: Chemical Composition and Toxicity of E-liquids and a Synthetic Coolant. Chem Res Toxicol 2022; 35:1344-1358. [PMID: 35849830 PMCID: PMC9382667 DOI: 10.1021/acs.chemrestox.1c00423] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The popularity of disposable fourth-generation electronic cigarettes (ECs) among young adults and adolescents has been increasing since the ban on flavored cartridge EC products such as JUUL. Although the constituents and toxicity of some cartridge-based fourth-generation ECs, such as JUUL, have been studied, limited data exist for other disposable ECs such as Puff. The purpose of this study was to determine flavor chemicals, synthetic coolants, and nicotine concentrations in 16 disposable Puff devices, evaluate the cytotoxicity of the different flavors from the Puff brand using in vitro assays, and investigate the health risks of synthetic coolants in EC products. Gas chromatography/mass spectrometry was used to identify and quantify chemicals in Puff EC fluids. One hundred and twenty-six flavor chemicals were identified in Puff fluids, and 16 were >1 mg/mL. WS-23 (2-isopropyl-N,2,3-trimethylbutyramide) was present in all products, and concentrations ranged from 0.8 to 45.1 mg/mL. WS-3 (N-ethyl-p-menthane-3-carboxamide) concentrations ranged from 1.5 to 16.4 mg/mL in 6/16 products. Nicotine concentrations ranged from 40.6 to 52.4 (average 44.8 mg/mL). All unvaped fluids were cytotoxic at dilutions between 0.1 and 10% in the MTT and neutral red uptake assays when tested with BEAS-2B lung epithelial cells. The cytotoxicity of Puff fluids was highly correlated with total chemical concentrations, nicotine, WS-23, both synthetic coolants, and synthetic coolants plus ethyl maltol. Lower concentrations of WS-23 than those in the fluids adversely affected cell growth and morphology. Concentrations of synthetic coolants exceeded levels used in consumer products. The margin of exposure data showed that WS-3 and WS-23 concentrations were high enough in Puff products to present a health hazard. Our study demonstrates that disposable Puff ECs have high levels of cytotoxic chemicals. The data support the regulation of flavor chemicals and synthetic coolants in ECs to limit potentially harmful health effects.
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Affiliation(s)
- Esther
E. Omaiye
- Environmental
Toxicology Graduate Program, University
of California Riverside, Riverside, California 92521, United States
- Department
of Molecular, Cell, and Systems Biology, University of California Riverside, Riverside, California 92521, United States
| | - Wentai Luo
- Department
of Civil and Environmental Engineering, Portland State University, Portland, Oregon 97201, United States
- Department
of Chemistry, Portland State University, Portland, Oregon 97201, United States
| | - Kevin J. McWhirter
- Department
of Civil and Environmental Engineering, Portland State University, Portland, Oregon 97201, United States
| | - James F. Pankow
- Department
of Civil and Environmental Engineering, Portland State University, Portland, Oregon 97201, United States
- Department
of Chemistry, Portland State University, Portland, Oregon 97201, United States
| | - Prue Talbot
- Department
of Molecular, Cell, and Systems Biology, University of California Riverside, Riverside, California 92521, United States
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23
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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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24
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Cahill KM, Johnson TK, Perveen Z, Schexnayder M, Xiao R, Heffernan LM, Langohr IM, Paulsen DB, Penn AL, Noël A. In utero exposures to mint-flavored JUUL aerosol impair lung development and aggravate house dust mite-induced asthma in adult offspring mice. Toxicology 2022; 477:153272. [PMID: 35878681 DOI: 10.1016/j.tox.2022.153272] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Revised: 07/04/2022] [Accepted: 07/21/2022] [Indexed: 11/18/2022]
Abstract
There are few reports concerning electronic nicotine delivery system (ENDS) use during pregnancy and no studies on asthma in prenatally JUUL-exposed offspring. Here, we tested the hypothesis that in utero JUUL exposure causes unfavorable birth outcomes and lasting pulmonary health effects in adult offspring. BALB/c dams were exposed to either air or mint-flavored JUUL aerosol, 1-hr/d, 20 consecutive days during gestation. Offspring were sacrificed on post-natal day (PND) 0 or at 11-week of age, following house dust mite (HDM) challenge. Gene expression was assessed in the uterine/placental tissue of the dams and lung responses were assessed in offspring at PND0 and at 11 weeks of age. JUUL-exposed offspring exhibited decreased body weights and lengths at PND0. These birth outcomes were accompanied by dysregulation of 54 genes associated with hypoxia and oxidative stress in the uterine/placental tissues of JUUL-exposed dams, as well as 24 genes in the lungs of the offspring related to Wnt signaling, plus 9 genes related to epigenetics, and 7 genes related to inflammation. At 11 weeks of age, JUUL + HDM exposed mice exhibited pulmonary inflammation when compared to their respective air + HDM controls. Additionally, the JUUL + HDM exposure dysregulated several genes associated with allergies and asthma. Further, the JUUL + HDM females showed decreased methylation of the promoter region of the Il10ra gene. Taken together, our mouse model shows that inhalation of JUUL aerosols during pregnancy affects the intrauterine environment, impairs lung development, and heightens the effects of allergic airway responses later in life.
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Affiliation(s)
- Kerin M Cahill
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Trenton K Johnson
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Zakia Perveen
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Matthew Schexnayder
- Lincoln Memorial University, College of Veterinary Medicine, 6965 Cumberland Gap Parkway, Harrogate, TN, USA
| | - Rui Xiao
- Department of Anesthesiology, Columbia University Medical Center, 630 West 168th Street, New York, NY 10032, USA
| | - Linda M Heffernan
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Ingeborg M Langohr
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Daniel B Paulsen
- Department of Pathobiological Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Arthur L Penn
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA
| | - Alexandra Noël
- Department of Comparative Biomedical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA.
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25
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Sinha I, Goel R, Bitzer ZT, Trushin N, Liao J, Sinha R. Evaluating electronic cigarette cytotoxicity and inflammatory
responses in vitro. Tob Induc Dis 2022; 20:45. [PMID: 35611070 PMCID: PMC9081552 DOI: 10.18332/tid/147200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Revised: 02/15/2022] [Accepted: 03/07/2022] [Indexed: 11/24/2022] Open
Affiliation(s)
- Indu Sinha
- Department of Biochemistry and Molecular Biology, Penn State College of Medicine, United States
| | - Reema Goel
- Department of Public Health Sciences, Penn State College of Medicine, United States
| | - Zachary T. Bitzer
- Department of Public Health Sciences, Penn State College of Medicine, United States
| | - Neil Trushin
- Department of Public Health Sciences, Penn State College of Medicine, United States
| | - Jason Liao
- Department of Public Health Sciences, Penn State College of Medicine, United States
| | - Raghu Sinha
- Department of Biochemistry and Molecular Biology, Penn State College of Medicine, United States
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26
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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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27
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Zhao W, Xu D, Zhang L, Meng H, Zheng Q, Wang J. Anti-inflammation of torachrysone-8-O-β-ᴅ-glucoside by hurdling over morphological changes of macrophages. Int Immunopharmacol 2022; 105:108548. [DOI: 10.1016/j.intimp.2022.108548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 01/02/2022] [Accepted: 01/13/2022] [Indexed: 12/20/2022]
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28
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Forest V, Mercier C, Pourchez J. Considerations on dosimetry for in vitro assessment of e-cigarette toxicity. Respir Res 2022; 23:358. [PMID: 36528600 PMCID: PMC9758947 DOI: 10.1186/s12931-022-02286-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Accepted: 12/09/2022] [Indexed: 12/23/2022] Open
Abstract
Electronic cigarettes (or e-cigarettes) can be used as smoking cessation aid. Some studies tend to show that they are less hazardous than tobacco cigarettes, even if it does not mean they are completely safe. The huge variation in study designs assessing in vitro toxicity of e-cigarettes aerosol makes it difficult to make comparisons and draw robust and irrefutable conclusions. In this paper, we review this heterogeneity (in terms of e-cigarette products, biological models, and exposure conditions) with a special focus on the wide disparity in the doses used as well as in the way they are expressed. Finally, we discuss the major issue of dosimetry and show how dosimetry tools enable to align data between different exposure systems or data from different laboratories and therefore allow comparisons to help further exploring the risk potential of e-cigarettes.
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Affiliation(s)
- Valérie Forest
- grid.7429.80000000121866389Mines Saint-Etienne, Univ Jean Monnet, INSERM, U1059 Sainbiose, Centre CIS, 158 Cours Fauriel, CS 62362, 42023 Saint-Etienne Cedex 2, France
| | - Clément Mercier
- grid.7429.80000000121866389Mines Saint-Etienne, Univ Jean Monnet, INSERM, U1059 Sainbiose, Centre CIS, 158 Cours Fauriel, CS 62362, 42023 Saint-Etienne Cedex 2, France
| | - Jérémie Pourchez
- grid.7429.80000000121866389Mines Saint-Etienne, Univ Jean Monnet, INSERM, U1059 Sainbiose, Centre CIS, 158 Cours Fauriel, CS 62362, 42023 Saint-Etienne Cedex 2, France
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29
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Esquer C, Echeagaray O, Firouzi F, Savko C, Shain G, Bose P, Rieder A, Rokaw S, Witon-Paulo A, Gude N, Sussman MA. Fundamentals of vaping-associated pulmonary injury leading to severe respiratory distress. Life Sci Alliance 2021; 5:5/2/e202101246. [PMID: 34810278 PMCID: PMC8616545 DOI: 10.26508/lsa.202101246] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 11/04/2021] [Accepted: 11/05/2021] [Indexed: 12/29/2022] Open
Abstract
Vaping of flavored liquids has been touted as safe alternative to traditional cigarette smoking with decreased health risks. The popularity of vaping has dramatically increased over the last decade, particularly among teenagers who incorporate vaping into their daily life as a social activity. Despite widespread and increasing adoption of vaping among young adults, there is little information on long-term consequences of vaping and potential health risks. This study demonstrates vaping-induced pulmonary injury using commercial JUUL pens with flavored vape juice using an inhalation exposure murine model. Profound pathological changes to upper airway, lung tissue architecture, and cellular structure are evident within 9 wk of exposure. Marked histologic changes include increased parenchyma tissue density, cellular infiltrates proximal to airway passages, alveolar rarefaction, increased collagen deposition, and bronchial thickening with elastin fiber disruption. Transcriptional reprogramming includes significant changes to gene families coding for xenobiotic response, glycerolipid metabolic processes, and oxidative stress. Cardiac systemic output is moderately but significantly impaired with pulmonary side ventricular chamber enlargement. This vaping-induced pulmonary injury model demonstrates mechanistic underpinnings of vaping-related pathologic injury.
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Affiliation(s)
- Carolina Esquer
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Oscar Echeagaray
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Fareheh Firouzi
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Clarissa Savko
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Grant Shain
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Pria Bose
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Abigail Rieder
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Sophie Rokaw
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Andrea Witon-Paulo
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Natalie Gude
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
| | - Mark A Sussman
- San Diego State University Integrated Regenerative Research Institute and Biology Department, San Diego State University, San Diego, CA, USA
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30
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Marques P, Piqueras L, Sanz MJ. An updated overview of e-cigarette impact on human health. Respir Res 2021; 22:151. [PMID: 34006276 PMCID: PMC8129966 DOI: 10.1186/s12931-021-01737-5] [Citation(s) in RCA: 116] [Impact Index Per Article: 38.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Accepted: 05/03/2021] [Indexed: 12/18/2022] Open
Abstract
The electronic cigarette (e-cigarette), for many considered as a safe alternative to conventional cigarettes, has revolutionised the tobacco industry in the last decades. In e-cigarettes, tobacco combustion is replaced by e-liquid heating, leading some manufacturers to propose that e-cigarettes have less harmful respiratory effects than tobacco consumption. Other innovative features such as the adjustment of nicotine content and the choice of pleasant flavours have won over many users. Nevertheless, the safety of e-cigarette consumption and its potential as a smoking cessation method remain controversial due to limited evidence. Moreover, it has been reported that the heating process itself can lead to the formation of new decomposition compounds of questionable toxicity. Numerous in vivo and in vitro studies have been performed to better understand the impact of these new inhalable compounds on human health. Results of toxicological analyses suggest that e-cigarettes can be safer than conventional cigarettes, although harmful effects from short-term e-cigarette use have been described. Worryingly, the potential long-term effects of e-cigarette consumption have been scarcely investigated. In this review, we take stock of the main findings in this field and their consequences for human health including coronavirus disease 2019 (COVID-19).
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Affiliation(s)
- Patrice Marques
- Department of Pharmacology, Faculty of Medicine, University of Valencia, Avda. Blasco Ibañez 15, 46010, Valencia, Spain.,Institute of Health Research INCLIVA, University Clinic Hospital of Valencia, Valencia, Spain
| | - Laura Piqueras
- Department of Pharmacology, Faculty of Medicine, University of Valencia, Avda. Blasco Ibañez 15, 46010, Valencia, Spain.,Institute of Health Research INCLIVA, University Clinic Hospital of Valencia, Valencia, Spain.,CIBERDEM-Spanish Biomedical Research Centre in Diabetes and Associated Metabolic Disorders, ISCIII, Av. Monforte de Lemos 3-5, 28029, Madrid, Spain
| | - Maria-Jesus Sanz
- Department of Pharmacology, Faculty of Medicine, University of Valencia, Avda. Blasco Ibañez 15, 46010, Valencia, Spain. .,Institute of Health Research INCLIVA, University Clinic Hospital of Valencia, Valencia, Spain. .,CIBERDEM-Spanish Biomedical Research Centre in Diabetes and Associated Metabolic Disorders, ISCIII, Av. Monforte de Lemos 3-5, 28029, Madrid, Spain.
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