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Thorne D, McHugh D, Simms L, Lee KM, Fujimoto H, Moses S, Gaca M. Applying new approach methodologies to assess next-generation tobacco and nicotine products. FRONTIERS IN TOXICOLOGY 2024; 6:1376118. [PMID: 38938663 PMCID: PMC11208635 DOI: 10.3389/ftox.2024.1376118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 04/30/2024] [Indexed: 06/29/2024] Open
Abstract
In vitro toxicology research has accelerated with the use of in silico, computational approaches and human in vitro tissue systems, facilitating major improvements evaluating the safety and health risks of novel consumer products. Innovation in molecular and cellular biology has shifted testing paradigms, with less reliance on low-throughput animal data and greater use of medium- and high-throughput in vitro cellular screening approaches. These new approach methodologies (NAMs) are being implemented in other industry sectors for chemical testing, screening candidate drugs and prototype consumer products, driven by the need for reliable, human-relevant approaches. Routine toxicological methods are largely unchanged since development over 50 years ago, using high-doses and often employing in vivo testing. Several disadvantages are encountered conducting or extrapolating data from animal studies due to differences in metabolism or exposure. The last decade saw considerable advancement in the development of in vitro tools and capabilities, and the challenges of the next decade will be integrating these platforms into applied product testing and acceptance by regulatory bodies. Governmental and validation agencies have launched and applied frameworks and "roadmaps" to support agile validation and acceptance of NAMs. Next-generation tobacco and nicotine products (NGPs) have the potential to offer reduced risks to smokers compared to cigarettes. These include heated tobacco products (HTPs) that heat but do not burn tobacco; vapor products also termed electronic nicotine delivery systems (ENDS), that heat an e-liquid to produce an inhalable aerosol; oral smokeless tobacco products (e.g., Swedish-style snus) and tobacco-free oral nicotine pouches. With the increased availability of NGPs and the requirement of scientific studies to support regulatory approval, NAMs approaches can supplement the assessment of NGPs. This review explores how NAMs can be applied to assess NGPs, highlighting key considerations, including the use of appropriate in vitro model systems, deploying screening approaches for hazard identification, and the importance of test article characterization. The importance and opportunity for fit-for-purpose testing and method standardization are discussed, highlighting the value of industry and cross-industry collaborations. Supporting the development of methods that are accepted by regulatory bodies could lead to the implementation of NAMs for tobacco and nicotine NGP testing.
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Affiliation(s)
- David Thorne
- BAT (Investments) Ltd., Southampton, Hampshire, United Kingdom
| | - Damian McHugh
- PMI R&D Philip Morris Products S. A., Neuchâtel, Switzerland
| | - Liam Simms
- Imperial Brands, Bristol, United Kingdom
| | - K. Monica Lee
- Altria Client Services LLC, Richmond, VA, United States
| | | | | | - Marianna Gaca
- BAT (Investments) Ltd., Southampton, Hampshire, United Kingdom
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Sarles SE, Hensel EC, Nuss C, Terry J, Robinson R. Characterization of mass distribution in a biomimetic aerosol exposure system. Inhal Toxicol 2024; 36:240-249. [PMID: 38669189 DOI: 10.1080/08958378.2024.2341995] [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: 10/16/2023] [Accepted: 04/06/2024] [Indexed: 04/28/2024]
Abstract
OBJECTIVE Lack of biomimicry in geometry and flow conditions of emissions systems for analytical testing and biological exposure has led to fundamental limitations, including a poor understanding of dose delivered to specific airway locations. This work characterizes mass distribution of a JUUL® brand e-cigarette in a Biomimetic Aerosol Exposure System (BAES). MATERIALS AND METHODS A combination of mass balance, direct measurements, and inferences based on direct measurements were used to characterize regional and local dose as a function of system flow path configuration and emissions topography profile. RESULTS Doses produced by the emissions topography profile with only puffing were significantly different from profiles with clean air inhalation following puffs. Mass characterization results support that dose can be manipulated using flow path geometry. Local and regional deposition was mapped throughout the system. DISCUSSION AND CONCLUSIONS We estimate the fraction of yield to the mouth deposited at several locations throughout the system for a variety of puffing and respiration topographies and show that emissions topography profile and system flow path geometry affect dose. This work provides proof-of-concept for assessing mass distribution as a function of aerosol generator (e-cigarette product), user airway geometry, and inhalation and puffing topography.
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Affiliation(s)
- S Emma Sarles
- Biomedical and Chemical Engineering PhD Program, Rochester Institute of Technology, Rochester, NY, USA
- Department of Mechanical Engineering, Rochester Institute of Technology, Rochester, NY, USA
| | - Edward C Hensel
- Department of Mechanical Engineering, Rochester Institute of Technology, Rochester, NY, USA
| | - Caleb Nuss
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, USA
| | - Janessa Terry
- Department of Biomedical Engineering, Rochester Institute of Technology, Rochester, NY, USA
| | - Risa Robinson
- Department of Mechanical Engineering, Rochester Institute of Technology, Rochester, NY, USA
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Foster JA. Consideration of vaping products as an alternative to adult smoking: a narrative review. Subst Abuse Treat Prev Policy 2023; 18:67. [PMID: 37974269 PMCID: PMC10655401 DOI: 10.1186/s13011-023-00571-w] [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: 03/07/2023] [Accepted: 10/19/2023] [Indexed: 11/19/2023] Open
Abstract
Tobacco harm reduction is a public health approach to reduce the impact of cigarette smoking on individuals. Non-combustible alternatives to cigarettes, such as electronic cigarettes (e-cigarettes), deliver nicotine to the user in the absence of combustion. The absence of combustion in e-cigarettes reduces the level of harmful or potentially harmful chemicals in the aerosol generated. This narrative review examines the published literature that studied the chemistry of e-cigarette aerosols, the related toxicology in cell culture and animal models, as well as clinical studies that investigated short- and long-term changes in biomarkers of smoke exposure after switching to e-cigarettes. In the context of the literature reviewed, the evidence supports the harm reduction potential for adult smokers who switch to e-cigarettes.
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Affiliation(s)
- Jane A Foster
- Department of Psychiatry & Behavioural Neurosciences, St. Joseph's Healthcare, 50 Charlton Ave. E., Hamilton, ON, L8N 4A6, Canada.
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4
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Caruso M, Emma R, Distefano A, Rust S, Poulas K, Giordano A, Volarevic V, Mesiakaris K, Boffo S, Arsenijevic A, Karanasios G, Pulvirenti R, Ilic A, Canciello A, Zuccarello P, Ferrante M, Polosa R, Li Volti G. Comparative assessment of electronic nicotine delivery systems aerosol and cigarette smoke on endothelial cell migration: The Replica Project. Drug Test Anal 2023; 15:1164-1174. [PMID: 35877466 DOI: 10.1002/dta.3349] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 07/07/2022] [Accepted: 07/14/2022] [Indexed: 11/08/2022]
Abstract
Cigarette smoking is associated with impairment of repair mechanisms necessary for vascular endothelium homeostasis. Reducing the exposure to smoke toxicants may result in the mitigation of the harmful effect on the endothelium and cardiovascular disease development. Previous investigations evaluated in vitro the effect of electronic cigarette (EC) compared with cigarette smoke demonstrating a significant reduction in human umbilical vein endothelial cells (HUVECs) migration inhibition following EC aerosol exposure. In the present study, we replicated one of these studies, evaluating the effects of cigarette smoke on endothelial cell migration compared with aerosol from EC and heated tobacco products (HTPs). We performed an in vitro scratch wound assay on endothelial cells with a multi-center approach (ring-study) to verify the robustness and reliability of the results obtained in the replicated study, also testing the effect of aerosol from two HTPs on endothelial cells. Consistently with the original study, we observed a substantial reduction of the effects of aerosol from EC and HTPs on endothelial cell migration compared with cigarette smoke. While cigarette smoke reduced endothelial wound healing ability already at low concentrations (12.5%) and in a concentration-dependent manner, EC and HTPs aerosol showed no effect on endothelial cells until 80%-100% concentrations. In conclusion, our study further confirms the importance of EC and tobacco heated products as a possible harm reduction strategy for cardiovascular diseases development in smokers.
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Affiliation(s)
- Massimo Caruso
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
- Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Catania, Italy
| | - Rosalia Emma
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Alfio Distefano
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Sonja Rust
- ECLAT Srl, University of Catania, Catania, Italy
| | - Konstantinos Poulas
- IRIS, Patras Science Park, Institute for Research and Innovation, Patras, Greece
- Laboratory of Molecular Biology and Immunology, Department of Pharmacy, University of Patras, Patras, Greece
| | - Antonio Giordano
- Sbarro Institute for Cancer Research and Molecular Medicine, Department of Biology, College of Science and Technology, Temple University, Philadelphia, Pennsylvania, USA
| | - Vladislav Volarevic
- Center for Molecular Medicine and Stem Cell Research, Department of Microbiology and Immunology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Konstantinos Mesiakaris
- IRIS, Patras Science Park, Institute for Research and Innovation, Patras, Greece
- Laboratory of Molecular Biology and Immunology, Department of Pharmacy, University of Patras, Patras, Greece
| | - Silvia Boffo
- Sbarro Institute for Cancer Research and Molecular Medicine, Department of Biology, College of Science and Technology, Temple University, Philadelphia, Pennsylvania, USA
| | - Aleksandar Arsenijevic
- Center for Molecular Medicine and Stem Cell Research, Department of Microbiology and Immunology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Georgios Karanasios
- IRIS, Patras Science Park, Institute for Research and Innovation, Patras, Greece
- Laboratory of Molecular Biology and Immunology, Department of Pharmacy, University of Patras, Patras, Greece
| | - Roberta Pulvirenti
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
| | - Aleksandar Ilic
- Center for Molecular Medicine and Stem Cell Research, Department of Microbiology and Immunology, Faculty of Medical Sciences, University of Kragujevac, Kragujevac, Serbia
| | - Angelo Canciello
- Sbarro Institute for Cancer Research and Molecular Medicine, Department of Biology, College of Science and Technology, Temple University, Philadelphia, Pennsylvania, USA
| | - Pietro Zuccarello
- Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Catania, Italy
| | - Margherita Ferrante
- Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Catania, Italy
| | - Riccardo Polosa
- Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Catania, Italy
- ECLAT Srl, University of Catania, Catania, Italy
- Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Giovanni Li Volti
- Department of Biomedical and Biotechnological Sciences, University of Catania, Catania, Italy
- Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Catania, Italy
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Wölkart G, Kollau A, Russwurm M, Koesling D, Schrammel A, Mayer B. Varied effects of tobacco smoke and e-cigarette vapor suggest that nicotine does not affect endothelium-dependent relaxation and nitric oxide signaling. Sci Rep 2023; 13:15833. [PMID: 37739972 PMCID: PMC10517138 DOI: 10.1038/s41598-023-42750-6] [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: 06/27/2023] [Accepted: 09/14/2023] [Indexed: 09/24/2023] Open
Abstract
Chronic smoking causes dysfunction of vascular endothelial cells, evident as a reduction of flow-mediated dilation in smokers, but the role of nicotine is still controversial. Given the increasing use of e-cigarettes and other nicotine products, it appears essential to clarify this issue. We studied extracts from cigarette smoke (CSE) and vapor from e-cigarettes (EVE) and heated tobacco (HTE) for their effects on vascular relaxation, endothelial nitric oxide signaling, and the activity of soluble guanylyl cyclase. The average nicotine concentrations of CSE, EVE, and HTE were 164, 800, and 85 µM, respectively. At a dilution of 1:3, CSE almost entirely inhibited the relaxation of rat aortas and porcine coronary arteries to acetylcholine and bradykinin, respectively, while undiluted EVE, with a 15-fold higher nicotine concentration, had no significant effect. With about 50% inhibition at 1:2 dilution, the effect of HTE was between CSE and EVE. Neither extract affected endothelium-independent relaxation to an NO donor. At the dilutions tested, CSE was not toxic to cultured endothelial cells but, in contrast to EVE, impaired NO signaling and inhibited NO stimulation of soluble guanylyl cyclase. Our results demonstrate that nicotine does not mediate the impaired endothelium-dependent vascular relaxation caused by smoking.
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Affiliation(s)
- Gerald Wölkart
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, Universität Graz, Humboldtstraße 46, 8010, Graz, Austria
| | - Alexander Kollau
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, Universität Graz, Humboldtstraße 46, 8010, Graz, Austria
| | - Michael Russwurm
- Department of Pharmacology and Toxicology, Ruhr-Universität Bochum, MA N1-39, 44780, Bochum, Germany
| | - Doris Koesling
- Department of Pharmacology and Toxicology, Ruhr-Universität Bochum, MA N1-39, 44780, Bochum, Germany
| | - Astrid Schrammel
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, Universität Graz, Humboldtstraße 46, 8010, Graz, Austria
| | - Bernd Mayer
- Department of Pharmacology and Toxicology, Institute of Pharmaceutical Sciences, Universität Graz, Humboldtstraße 46, 8010, Graz, Austria.
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Rouabhia M, Piché M, Hazzi C, Corriveau MN, Chakir J. Effect of cannabis smoke condensate on human nasal epithelial cell adhesion, growth, and migration. Am J Otolaryngol 2023; 44:103890. [PMID: 37058911 DOI: 10.1016/j.amjoto.2023.103890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 03/30/2023] [Accepted: 04/02/2023] [Indexed: 04/16/2023]
Abstract
OBJECTIVE When inhaled, cannabis smoke interacts with airway tissues, including the nasal mucosa, which may lead to nasal pathologies. We examined the effect of cannabis smoke condensate (CSC) on nasal epithelial cell and tissue behaviors. METHODS Human nasal epithelial cells were exposed or not to CSC at different concentrations (1, 5, 10, and 20 %) and for different durations. Cell adhesion and viability were assessed, as well as post-wound cell migration and lactate dehydrogenase (LDH) release. RESULTS The nasal epithelial cells showed a larger cell size and a faint nucleus following exposure to CSC, compared to that observed in that control. This was supported by fewer adherent cells present after exposure for either 1 or 24 h to 5, 15, and 20 % CSC. CSC also had a significant toxic effect by reducing cell viability after both 1 and 24 h of exposure. This toxic effect was significant even at a low concentration (1 %) of CSC. The effects on nasal epithelial cell viability were confirmed by the decrease in cell migration. After the scratch and subsequent exposure to CSC for either 6 or 24 h, a complete inhibition of nasal epithelial cell migration was observed, compared to that found in the controls. CSC was toxic to the nasal epithelial cells, as the level of LDH significantly increased following cell exposure all CSC concentrations. CONCLUSION Cannabis smoke condensate had a negative effect on several nasal epithelial cell behaviors. These findings indicate that cannabis smoke could be a threat to nasal tissues and ultimately lead to nasal and sinus disorders.
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Affiliation(s)
- Mahmoud Rouabhia
- Groupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, Québec, Canada.
| | - Marilou Piché
- Oto-rhino-laryngologie, Chirurgie Cervico-faciale, CHU de Québec, Université Laval, Canada
| | - Christina Hazzi
- Oto-rhino-laryngologie, Chirurgie Cervico-faciale, CHU de Québec, Université Laval, Canada
| | - Marie-Noëlle Corriveau
- Oto-rhino-laryngologie, Chirurgie Cervico-faciale, CHU de Québec, Université Laval, Canada
| | - Jamila Chakir
- Institut Universitaire de Cardiologie et de Pneumologie de Québec, Université Laval, Québec, QC, Canada
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Ohashi K, Hayashida A, Nozawa A, Matsumura K, Ito S. Human vasculature-on-a-chip with macrophage-mediated endothelial activation: The biological effect of aerosol from heated tobacco products on monocyte adhesion. Toxicol In Vitro 2023; 89:105582. [PMID: 36933580 DOI: 10.1016/j.tiv.2023.105582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 02/28/2023] [Accepted: 03/13/2023] [Indexed: 03/18/2023]
Abstract
Heated tobacco products (HTPs) are expected to have the potential to reduce risks of smoking-associated cardiovascular disease (CVD). However, mechanism-based investigations of the effect of HTPs on atherosclerosis remain insufficient and further studies under human-relevant situations are desired for deeper understanding of the reduced risk potential of HTPs. In this study, we first developed an in vitro model of monocyte adhesion by considering macrophage-derived proinflammatory cytokine-mediated endothelial activation using an organ-on-a-chip (OoC), which provided great opportunities to mimic major aspects of human physiology. Then biological activities of aerosol from three different types of HTPs in terms of monocyte adhesion were compared with that of cigarette smoke (CS). Our model showed that the effective concentration ranges of tumor necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) were close to the actual condition in CVD pathogenesis. The model also showed that monocyte adhesion was less induced by each HTP aerosol than CS, which may be caused by less proinflammatory cytokine secretion. In summary, our vasculature-on-a-chip model assessed the difference in biological effects between cigarettes and HTPs, and suggested a reduced risk potential of HTPs for atherosclerosis.
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Affiliation(s)
- Kazuhiro Ohashi
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba-ku, Yokohama 227-8512, Kanagawa, Japan.
| | - Ayaka Hayashida
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba-ku, Yokohama 227-8512, Kanagawa, Japan.
| | - Atsuko Nozawa
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba-ku, Yokohama 227-8512, Kanagawa, Japan.
| | - Kazushi Matsumura
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba-ku, Yokohama 227-8512, Kanagawa, Japan.
| | - Shigeaki Ito
- Scientific Product Assessment Center, R&D Group, Japan Tobacco Inc., 6-2 Umegaoka, Aoba-ku, Yokohama 227-8512, Kanagawa, Japan.
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8
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Ashour O, Al-Huneidy L, Noordeen H. The implications of vaping on surgical wound healing: A systematic review. Surgery 2023; 173:1452-1462. [PMID: 36997424 DOI: 10.1016/j.surg.2023.02.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 02/16/2023] [Accepted: 02/17/2023] [Indexed: 03/31/2023]
Abstract
BACKGROUND E-cigarette use is rapidly growing, and little is known about the postoperative complications. Cigarette smoking has been well-established to be associated with delayed wound healing and increased complications in surgical patients. Due to the intricate and harmonious nature of the wound-healing process, vaping may impair tissue regeneration, posing a risk for patients undergoing surgery. This systematic review aimed to review the evidence on the implications of vaping on wound healing. METHODS A systematic search of PubMed and Scopus databases was conducted on October 2022 per Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines. The following keywords were used to conduct the search: vaping, vape, e-cigarettes, electronic cigarettes, wound healing, tissue regeneration, postoperative complications, wound infection, and blood flow. RESULTS Of 5,265 screened articles, only 37 were eligible for qualitative synthesis. A total of 18 articles studied the effect of e-cigarettes on human volunteers, 14 investigated e-cigarette extract on human cell lines, and 5 used animal rat models. CONCLUSION Despite limited objective data, the recommendation is that e-cigarettes be treated as tobacco cigarettes; hence, vaping should be stopped in the perioperative period to decrease the incidence of wound healing complications. Clinical trials are required to understand the health hazards of e-cigarettes further and maximize patient safety and clinical outcomes.
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9
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Majid S, Weisbrod RM, Fetterman JL, Keith RJ, Rizvi SHM, Zhou Y, Behrooz L, Robertson RM, Bhatnagar A, Conklin DJ, Hamburg NM. Pod-based e-liquids impair human vascular endothelial cell function. PLoS One 2023; 18:e0280674. [PMID: 36701344 PMCID: PMC9879485 DOI: 10.1371/journal.pone.0280674] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Accepted: 01/05/2023] [Indexed: 01/27/2023] Open
Abstract
Pod-based electronic (e-) cigarettes more efficiently deliver nicotine using a protonated formulation. The cardiovascular effects associated with these devices are poorly understood. We evaluated whether pod-based e-liquids and their individual components impair endothelial cell function. We isolated endothelial cells from people who are pod users (n = 10), tobacco never users (n = 7), and combustible cigarette users (n = 6). After a structured use, pod users had lower acetylcholine-mediated endothelial nitric oxide synthase (eNOS) activation compared with never users and was similar to levels from combustible cigarette users (overall P = 0.008, P = 0.01 pod vs never; P = 0.96 pod vs combustible cigarette). The effects of pod-based e-cigarettes and their constituents on vascular cell function were further studied in commercially available human aortic endothelial cells (HAECs) incubated with flavored JUUL e-liquids or propylene glycol (PG):vegetable glycerol (VG) at 30:70 ratio with or without 60 mg/mL nicotine salt for 90 min. A progressive increase in cell death with JUUL e-liquid exposure was observed across 0.0001-1% dilutions; PG:VG vehicle with and without nicotine salt induced cell death. A23187-stimulated nitric oxide production was decreased with all JUUL e-liquid flavors, PG:VG and nicotine salt exposures. Aerosols generated by JUUL e-liquid heating similarly decreased stimulated nitric oxide production. Only mint flavored e-liquids increased inflammation and menthol flavored e-liquids enhanced oxidative stress in HAECs. In conclusion, pod e-liquids and their individual components appear to impair endothelial cell function. These findings indicate the potential harm of pod-based devices on endothelial cell function and thus may be relevant to cardiovascular injury in pod type e-cigarette users.
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Affiliation(s)
- Sana Majid
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
| | - Robert M. Weisbrod
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
| | - Jessica L. Fetterman
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
| | - Rachel J. Keith
- University of Louisville School of Medicine, Louisville, KY, United States of America
| | - Syed H. M. Rizvi
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
| | - Yuxiang Zhou
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
| | - Leili Behrooz
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
| | | | - Aruni Bhatnagar
- University of Louisville School of Medicine, Louisville, KY, United States of America
| | - Daniel J. Conklin
- University of Louisville School of Medicine, Louisville, KY, United States of America
| | - Naomi M. Hamburg
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine, Boston, MA, United States of America
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In Vitro effects of alternative smoking devices on oral cells: Electronic cigarette and heated tobacco product versus tobacco smoke. Arch Oral Biol 2022; 144:105550. [DOI: 10.1016/j.archoralbio.2022.105550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/24/2022] [Accepted: 09/18/2022] [Indexed: 11/20/2022]
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11
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Chapman F, Sticken ET, Wieczorek R, Pour SJ, Dethloff O, Budde J, Rudd K, Mason E, Czekala L, Yu F, Simms L, Nahde T, O'Connell G, Stevenson M. Multiple endpoint in vitro toxicity assessment of a prototype heated tobacco product indicates substantially reduced effects compared to those of combustible cigarette. Toxicol In Vitro 2022; 86:105510. [DOI: 10.1016/j.tiv.2022.105510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 10/22/2022] [Accepted: 10/31/2022] [Indexed: 11/13/2022]
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12
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Su L, Zhao M, Ma F, An Z, Yue Q, Zhao C, Sun X, Zhang S, Xu J, Jiang X, Li K, Zhao L. A comparative assessment of e-cigarette aerosol extracts and tobacco cigarette smoke extracts on in vitro endothelial cell inflammation response. Hum Exp Toxicol 2022; 41:9603271221088996. [PMID: 35382644 DOI: 10.1177/09603271221088996] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
With the development of the times, electronic cigarettes (e-cigarettes) are being received by more and more people. We compared the different effects of e-cigarettes and tobacco cigarettes on human umbilical vein endothelial cells (HUVECs) treated with the typical e-cigarette aerosol extracts (ECA) and cigarette smoking extracts (CS) sourced from commercial retail stores. HUVECs were treated with different kinds of ECA or CS with different nicotinic concentrations (0.03125, 0.125, 0.5, 2, 8, or 32 μg/mL). Cell viability was examined by the MTT assay. The cell apoptosis was investigated by acridine orange (AO) and Hoechst 33258 staining. The RT-PCR and western blot assays were used to analyze the adhesion molecules and inflammation cytokines released by HUVECs. Furthermore, the intracellular reactive oxygen species (ROS) was observed by fluorescence microscopy. Our data showed that the CS (nicotine concentration at 0.125 μg/mL could decrease the viability of HUVECs by 71%, but not the four kinds of ECA. The apoptotic ratio was about 32.5% in the CS group. No matter the levels of adhesion molecules, inflammation cytokines or ROS, they were higher in CS groups than in ECA groups. Overall, the four kinds of e-cigarettes induced significantly less cytotoxicity than the commercially available tobacco cigarettes in HUVECs. The CS showed the most severe impact on HUVECs. ECA might provide a harm reduction measure, especially in cardiovascular risk, after people switch from tobacco cigarettes to e-cigarettes.
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Affiliation(s)
- Le Su
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Minghan Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Feifan Ma
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Zaiyong An
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Qiulin Yue
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Chen Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Xin Sun
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Song Zhang
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
| | - Jing Xu
- Shenzhen RELX Tech. Co., Ltd, Shenzhen, China
| | | | - Kunlun Li
- Jinan Hangchen Biotechnology Co., Ltd, Jinan, China
| | - Lin Zhao
- State Key Laboratory of Biobased Material and Green Papermaking, School of Bioengineering, 12689Qilu University of Technology, Shandong Academy of Sciences, Jinan, China
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13
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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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14
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Caruso M, Emma R, Distefano A, Rust S, Poulas K, Zadjali F, Giordano A, Volarevic V, Mesiakaris K, Al Tobi M, Boffo S, Arsenijevic A, Zuccarello P, Giallongo C, Ferrante M, Polosa R, Li Volti G. Electronic nicotine delivery systems exhibit reduced bronchial epithelial cells toxicity compared to cigarette: the Replica Project. Sci Rep 2021; 11:24182. [PMID: 34921164 PMCID: PMC8683499 DOI: 10.1038/s41598-021-03310-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Accepted: 12/01/2021] [Indexed: 11/30/2022] Open
Abstract
Electronic nicotine delivery systems (ENDS) may reduce health risks associated with chronic exposure to smoke and their potential benefits have been the matter of intense scientific debate. We aimed to replicate three published studies on cytotoxic and inflammatory effects of cigarette smoke and ENDS aerosol in an independent multi-center ring study. We aimed to establish the reliability of results and the robustness of conclusions by replicating the authors' experimental protocols and further validating them with different techniques. Human bronchial epithelial cells (NCI-H292) were exposed to cigarette whole smoke and vapor phase and to aerosol from ENDS. We also assessed the inflammatory cytokines interleukin-6 and interleukin-8 and the remodeling mediator matrix metalloproteinase-1. We replicated cell viability results and confirmed that almost 80% of cytotoxic effects are due to volatile compounds in the vapor phase of smoke. Our findings substantiated the reduced cytotoxic effects of ENDS aerosol. However, our data on inflammatory and remodeling activity triggered by smoke differed significantly from those in the original reports. Taken together, independent data from multiple laboratories clearly demonstrated the reduced toxicity of ENDS products compared to cigarettes.
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Affiliation(s)
- Massimo Caruso
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia, 97, 95123, Catania, Italy
- Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Via S. Sofia, 97, 95123, Catania, Italy
| | - Rosalia Emma
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia, 97, 95123, Catania, Italy
- Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Via S. Sofia, 97, 95123, Catania, Italy
| | - Alfio Distefano
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia, 97, 95123, Catania, Italy
| | - Sonja Rust
- ECLAT Srl, spin-off of the University of Catania, Via S. Sofia 89, 95123, Catania, Italy
| | - Konstantinos Poulas
- Institute for Research and Innovation, IRIS, Patras Science Park, Patras, Greece
- Laboratory of Molecular Biology and Immunology, Department of Pharmacy, University of Patras, Patras, Greece
| | - Fahad Zadjali
- College of Medicine and Health Sciences, Department of Clinical Biochemistry, Sultan Qaboos University, P.C 123, P.O. Box 35, Khodh, Oman
| | - Antonio Giordano
- Sbarro Institute for Cancer Research and Molecular Medicine, Department of Biology, College of Science and Technology, Temple University, Philadelphia, USA
| | - Vladislav Volarevic
- Center for Molecular Medicine and Stem Cell Research, Department of Microbiology and Immunology, Faculty of Medical Sciences, University of Kragujevac, 69 Svetozara Markovica Street, 34000, Kragujevac, Serbia
| | - Konstantinos Mesiakaris
- Institute for Research and Innovation, IRIS, Patras Science Park, Patras, Greece
- Laboratory of Molecular Biology and Immunology, Department of Pharmacy, University of Patras, Patras, Greece
| | - Mohammed Al Tobi
- College of Medicine and Health Sciences, Department of Clinical Biochemistry, Sultan Qaboos University, P.C 123, P.O. Box 35, Khodh, Oman
| | - Silvia Boffo
- Sbarro Institute for Cancer Research and Molecular Medicine, Department of Biology, College of Science and Technology, Temple University, Philadelphia, USA
| | - Aleksandar Arsenijevic
- Center for Molecular Medicine and Stem Cell Research, Department of Microbiology and Immunology, Faculty of Medical Sciences, University of Kragujevac, 69 Svetozara Markovica Street, 34000, Kragujevac, Serbia
| | - Pietro Zuccarello
- Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Via S. Sofia, 87, 95123, Catania, Italy
| | - Cesarina Giallongo
- Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Via S. Sofia, 87, 95123, Catania, Italy
| | - Margherita Ferrante
- Department of Medical, Surgical Sciences and Advanced Technologies "G.F. Ingrassia", University of Catania, Via S. Sofia, 87, 95123, Catania, Italy
| | - Riccardo Polosa
- Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Via S. Sofia, 97, 95123, Catania, Italy
- ECLAT Srl, spin-off of the University of Catania, Via S. Sofia 89, 95123, Catania, Italy
- Department of Clinical and Experimental Medicine, University of Catania, Via S. Sofia, 97, 95123, Catania, Italy
| | - Giovanni Li Volti
- Department of Biomedical and Biotechnological Sciences, University of Catania, Via S. Sofia, 97, 95123, Catania, Italy.
- Center of Excellence for the Acceleration of Harm Reduction (CoEHAR), University of Catania, Via S. Sofia, 97, 95123, Catania, Italy.
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15
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Palazzolo DL, Caudill J, Baron J, Cooper K. Fabrication and Validation of an Economical, Programmable, Dual-Channel, Electronic Cigarette Aerosol Generator. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph182413190. [PMID: 34948804 PMCID: PMC8703563 DOI: 10.3390/ijerph182413190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Revised: 12/06/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022]
Abstract
Vaping (inhalation of electronic cigarette-generated aerosol) is a public health concern. Due to recent spikes in adolescent use of electronic cigarettes (ECIGs) and vaping-induced illnesses, demand for scientific inquiry into the physiological effects of electronic cigarette (ECIG) aerosol has increased. For such studies, standardized and consistent aerosol production is required. Many labs generate aerosol by manually activating peristaltic pumps and ECIG devices simultaneously in a predefined manner. The tedium involved with this process (large puff number over time) and risk of error in keeping with puff topography (puff number, duration, interval) are less than optimal. Furthermore, excess puffing on an ECIG device results in battery depletion, reducing aerosol production, and ultimately, its chemical and physical nature. While commercial vaping machines are available, the cost of these machines is prohibitive to many labs. For these reasons, an economical and programmable ECIG aerosol generator, capable of generating aerosol from two atomizers simultaneously, was fabricated, and subsequently validated. Validation determinants include measurements of atomizer temperatures (inside and outside), electrical parameters (current, resistance and power) of the circuitry, aerosol particle distribution (particle counts and mass concentrations) and aerosol delivery (indexed by nicotine recovery), all during stressed conditions of four puffs/minute for 75 min (i.e., 300 puffs). Validation results indicate that the ECIG aerosol generator is better suited for experiments involving ≤100 puffs. Over 100 puffs, the amount of variation in the parameters measured tends to increase. Variations between channels are generally higher than variations within a channel. Despite significant variations in temperatures, electrical parameters, and aerosol particle distributions, both within and between channels, aerosol delivery remains remarkably stable for up to 300 puffs, yielding over 25% nicotine recovery for both channels. In conclusion, this programmable, dual-channel ECIG aerosol generator is not only affordable, but also allows the user to control puff topography and eliminate battery drain of ECIG devices. Consequently, this aerosol generator is valid, reliable, economical, capable of using a variety of E-liquids and amenable for use in a vast number of studies investigating the effects of ECIG-generated aerosol while utilizing a multitude of puffing regimens in a standardized manner.
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Affiliation(s)
- Dominic L. Palazzolo
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
- Correspondence:
| | - Jordan Caudill
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
| | - James Baron
- Department of Physiology, DeBusk College of Osteopathic Medicine, Lincoln Memorial University, Harrogate, TN 37752, USA; (J.C.); (J.B.)
| | - Kevin Cooper
- Department of Chemistry and Physics, School of Mathematics & Sciences, Lincoln Memorial University, Harrogate, TN 37752, USA;
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16
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Le HHT, Liu CW, Denaro P, Jousma J, Shao NY, Rahman I, Lee WH. Genome-wide differential expression profiling of lncRNAs and mRNAs in human induced pluripotent stem cell-derived endothelial cells exposed to e-cigarette extract. Stem Cell Res Ther 2021; 12:593. [PMID: 34863290 PMCID: PMC8643021 DOI: 10.1186/s13287-021-02654-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Accepted: 10/31/2021] [Indexed: 12/27/2022] Open
Abstract
BACKGROUND Electronic-cigarette (e-cig) usage, particularly in the youth population, is a growing concern. It is known that e-cig causes endothelial dysfunction, which is a risk factor for the development of cardiovascular diseases; however, the mechanisms involved remain unclear. We hypothesized that long noncoding RNAs (lncRNAs) may play a role in e-cig-induced endothelial dysfunction. METHODS Here, we identified lncRNAs that are dysregulated in human induced pluripotent stem cell-derived endothelial cells (iPSC-ECs) following 24 h of e-cig aerosol extract treatment via microarray analysis. We performed Gene Ontology and Kyoto Encyclopedia of Genes and Genome (KEGG) pathway analyses of the dysregulated mRNAs following e-cig exposure and constructed co-expression networks of the top 5 upregulated lncRNAs and the top 5 downregulated lncRNAs and the mRNAs that are correlated with them. Furthermore, the functional effects of knocking down lncRNA lung cancer-associated transcript 1 (LUCAT1) on EC phenotypes were determined as it was one of the significantly upregulated lncRNAs following e-cig exposure based on our profiling. RESULTS 183 lncRNAs and 132 mRNAs were found to be upregulated, whereas 297 lncRNAs and 413 mRNAs were found to be downregulated after e-cig exposure. We also observed that e-cig caused dysregulation of endothelial metabolism resulting in increased FAO activity, higher mitochondrial membrane potential, and decreased glucose uptake and glycolysis. These results suggest that e-cig alters EC metabolism by increasing FAO to compensate for energy deficiency in ECs. Finally, the knockdown of LUCAT1 prevented e-cig-induced EC dysfunction by maintaining vascular barrier, reducing reactive oxygen species level, and increasing migration capacity. CONCLUSION This study identifies an expression profile of differentially expressed lncRNAs and several potential regulators and pathways in ECs exposed to e-cig, which provide insights into the regulation of lncRNAs and mRNAs and the role of lncRNA and mRNA networks in ECs associated e-cig exposure.
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Affiliation(s)
- Hoai Huong Thi Le
- Department of Basic Medical Sciences, University of Arizona College of Medicine, 425 N 5th Street, Building ABC1, Rm 426, Phoenix, AZ, 85004-2157, USA
| | - Chen-Wei Liu
- Department of Basic Medical Sciences, University of Arizona College of Medicine, 425 N 5th Street, Building ABC1, Rm 426, Phoenix, AZ, 85004-2157, USA
| | - Philip Denaro
- Department of Basic Medical Sciences, University of Arizona College of Medicine, 425 N 5th Street, Building ABC1, Rm 426, Phoenix, AZ, 85004-2157, USA
| | - Jordan Jousma
- Department of Pharmacology and Regenerative Medicine, University of Illinois College of Medicine, Chicago, IL, 60612, USA
| | - Ning-Yi Shao
- Health Sciences, University of Macau, Macau, China
| | - Irfan Rahman
- Department of Environmental Medicine, University of Rochester Medical Center, Rochester, NY, 14642, USA
| | - Won Hee Lee
- Department of Basic Medical Sciences, University of Arizona College of Medicine, 425 N 5th Street, Building ABC1, Rm 426, Phoenix, AZ, 85004-2157, USA.
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17
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Giebe S, Hofmann A, Brux M, Lowe F, Breheny D, Morawietz H, Brunssen C. Comparative study of the effects of cigarette smoke versus next generation tobacco and nicotine product extracts on endothelial function. Redox Biol 2021; 47:102150. [PMID: 34601427 PMCID: PMC8531844 DOI: 10.1016/j.redox.2021.102150] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 11/29/2022] Open
Abstract
Tobacco smoking and hemodynamic forces are key stimuli for the development of endothelial dysfunction. As an alternative to smoking, next generation tobacco and nicotine products (NGP) are now widely used. However, little is known about their potential pro-inflammatory and atherogenic effects on the endothelium. In this study, we analyzed key parameters of endothelial function after exposure to aqueous smoke extracts (AqE) of a heated tobacco product (HTP), an electronic cigarette (e-cig), a conventional cigarette (3R4F) and pure nicotine. All experiments were performed under atheroprotective high laminar or atherogenic low flow with primary human endothelial cells. Treatment with 3R4F, but not alternative smoking products, reduced endothelial cell viability and wound healing capability via the PI3K/AKT/eNOS(NOS3) pathway. Laminar flow delayed detrimental effects on cell viability by 3R4F treatment. 3R4F stimulation led to activation of NRF2 antioxidant defense system at nicotine concentrations ≥0.56 μg/ml and increased expression of its target genes HMOX1 and NQO1. Treatment with HTP revealed an induction of HMOX1 and NQO1 at dosages with ≥1.68 μg/ml nicotine, whereas e-cig and nicotine exposure had no impact. Analyses of pro-inflammatory genes revealed an increased ICAM1 expression under 3R4F treatment. 3R4F reduced VCAM1 expression in a dose-dependent manner; HTP treatment had similar but milder effects; e-cig and nicotine treatment had no impact. SELE expression was induced by 3R4F under static conditions. High laminar flow prevented this upregulation. Stimulation with laminar flow led to downregulation of CCL2 (MCP-1). From this downregulated level, only 3R4F increased CCL2 expression at higher concentrations. Finally, under static conditions, all components increased adhesion of monocytes to endothelial cells. Interestingly, only stimulation with 3R4F revealed increased monocyte adhesion under atherosclerosis-prone low flow. In conclusion, all product categories activated anti-oxidative or pro-inflammatory patterns. NGP responses were typically lower than in 3R4F exposed cells. Also, 3R4F stimulation led to an impaired endothelial wound healing and induced a pro-inflammatory phenotype compared to NGP treatment.
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Affiliation(s)
- Sindy Giebe
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany
| | - Anja Hofmann
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany
| | - Melanie Brux
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany
| | - Frazer Lowe
- Group Research & Development, British American Tobacco, Southampton, United Kingdom
| | - Damien Breheny
- Group Research & Development, British American Tobacco, Southampton, United Kingdom
| | - Henning Morawietz
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany
| | - Coy Brunssen
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany.
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18
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Bennet TJ, Randhawa A, Hua J, Cheung KC. Airway-On-A-Chip: Designs and Applications for Lung Repair and Disease. Cells 2021; 10:1602. [PMID: 34206722 PMCID: PMC8304815 DOI: 10.3390/cells10071602] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 06/21/2021] [Accepted: 06/23/2021] [Indexed: 12/22/2022] Open
Abstract
The lungs are affected by illnesses including asthma, chronic obstructive pulmonary disease, and infections such as influenza and SARS-CoV-2. Physiologically relevant models for respiratory conditions will be essential for new drug development. The composition and structure of the lung extracellular matrix (ECM) plays a major role in the function of the lung tissue and cells. Lung-on-chip models have been developed to address some of the limitations of current two-dimensional in vitro models. In this review, we describe various ECM substitutes utilized for modeling the respiratory system. We explore the application of lung-on-chip models to the study of cigarette smoke and electronic cigarette vapor. We discuss the challenges and opportunities related to model characterization with an emphasis on in situ characterization methods, both established and emerging. We discuss how further advancements in the field, through the incorporation of interstitial cells and ECM, have the potential to provide an effective tool for interrogating lung biology and disease, especially the mechanisms that involve the interstitial elements.
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Affiliation(s)
- Tanya J. Bennet
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (T.J.B.); (A.R.); (J.H.)
- Centre for Blood Research, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Avineet Randhawa
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (T.J.B.); (A.R.); (J.H.)
- Centre for Blood Research, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Jessica Hua
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (T.J.B.); (A.R.); (J.H.)
- Centre for Blood Research, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
| | - Karen C. Cheung
- School of Biomedical Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; (T.J.B.); (A.R.); (J.H.)
- Centre for Blood Research, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- Department of Electrical & Computer Engineering, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
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19
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Czekala L, Chapman F, Simms L, Rudd K, Trelles Sticken E, Wieczorek R, Bode LM, Pani J, Moelijker N, Derr R, Brandsma I, Hendriks G, Stevenson M, Walele T. The in vitro ToxTracker and Aneugen Clastogen Evaluation extension assay as a tool in the assessment of relative genotoxic potential of e-liquids and their aerosols. Mutagenesis 2021; 36:129-142. [PMID: 33769537 PMCID: PMC8166346 DOI: 10.1093/mutage/geaa033] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 11/24/2020] [Indexed: 12/14/2022] Open
Abstract
In vitro (geno)toxicity assessment of electronic vapour products (EVPs), relative to conventional cigarette, currently uses assays, including the micronucleus and Ames tests. Whilst informative on induction of a finite endpoint and relative risk posed by test articles, such assays could benefit from mechanistic supplementation. The ToxTracker and Aneugen Clastogen Evaluation analysis can indicate the activation of reporters associated with (geno)toxicity, including DNA damage, oxidative stress, the p53-related stress response and protein damage. Here, we tested for the different effects of a selection of neat e-liquids, EVP aerosols and Kentucky reference 1R6F cigarette smoke samples in the ToxTracker assay. The assay was initially validated to assess whether a mixture of e-liquid base components, propylene glycol (PG) and vegetable glycerine (VG) had interfering effects within the system. This was achieved by spiking three positive controls into the system with neat PG/VG or phosphate-buffered saline bubbled (bPBS) PG/VG aerosol (nicotine and flavour free). PG/VG did not greatly affect responses induced by the compounds. Next, when compared to cigarette smoke samples, neat e-liquids and bPBS aerosols (tobacco flavour; 1.6% freebase nicotine, 1.6% nicotine salt or 0% nicotine) exhibited reduced and less complex responses. Tested up to a 10% concentration, EVP aerosol bPBS did not induce any ToxTracker reporters. Neat e-liquids, tested up to 1%, induced oxidative stress reporters, thought to be due to their effects on osmolarity in vitro. E-liquid nicotine content did not affect responses induced. Additionally, spiking nicotine alone only induced an oxidative stress response at a supraphysiological level. In conclusion, the ToxTracker assay is a quick, informative screen for genotoxic potential and mechanisms of a variety of (compositionally complex) samples, derived from cigarettes and EVPs. This assay has the potential for future application in the assessment battery for next-generation (smoking alternative) products, including EVPs.
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Affiliation(s)
- Lukasz Czekala
- Group Science and Regulatory Affairs, Imperial Brands PLC, Bristol, UK
| | - Fiona Chapman
- Group Science and Regulatory Affairs, Imperial Brands PLC, Bristol, UK
| | - Liam Simms
- Group Science and Regulatory Affairs, Imperial Brands PLC, Bristol, UK
| | - Kathryn Rudd
- Group Science and Regulatory Affairs, Imperial Brands PLC, Bristol, UK
| | - Edgar Trelles Sticken
- Reemtsma Cigarettenfabriken GmbH, an Imperial Brands PLC Company, Albert-Einstein-Ring-7, D-22761 Hamburg, Germany
| | - Roman Wieczorek
- Reemtsma Cigarettenfabriken GmbH, an Imperial Brands PLC Company, Albert-Einstein-Ring-7, D-22761 Hamburg, Germany
| | - Lisa Maria Bode
- Reemtsma Cigarettenfabriken GmbH, an Imperial Brands PLC Company, Albert-Einstein-Ring-7, D-22761 Hamburg, Germany
| | - Jutta Pani
- Reemtsma Cigarettenfabriken GmbH, an Imperial Brands PLC Company, Albert-Einstein-Ring-7, D-22761 Hamburg, Germany
| | - Nynke Moelijker
- Toxys B.V., Robert Boyleweg 4, 2333 CG Leiden, The Netherlands
| | - Remco Derr
- Toxys B.V., Robert Boyleweg 4, 2333 CG Leiden, The Netherlands
| | - Inger Brandsma
- Toxys B.V., Robert Boyleweg 4, 2333 CG Leiden, The Netherlands
| | - Giel Hendriks
- Toxys B.V., Robert Boyleweg 4, 2333 CG Leiden, The Netherlands
| | - Matthew Stevenson
- Group Science and Regulatory Affairs, Imperial Brands PLC, Bristol, UK
| | - Tanvir Walele
- Group Science and Regulatory Affairs, Imperial Brands PLC, Bristol, UK
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20
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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: 150] [Impact Index Per Article: 50.0] [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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21
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Morris TM, Marlborough FJ, Montgomery RJ, Allison KP, Eardley WGP. Smoking and the patient with a complex lower limb injury. Injury 2021; 52:814-824. [PMID: 33495022 DOI: 10.1016/j.injury.2020.12.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 11/11/2020] [Accepted: 12/23/2020] [Indexed: 02/02/2023]
Abstract
Smoking is known to increase the risk of peri-operative complications in Orthoplastic surgery by impairing bone and wound healing. The effects of nicotine replacement therapies (NRTs) and electronic cigarettes (e-cigarettes) has been less well established. Previous reviews have examined the relationship between smoking and bone and wound healing separately. This review provides surgeons with a comprehensive and contemporaneous account of how smoking in all forms interacts with all aspects of complex lower limb trauma. We provide a guide for surgeons to refer to during the consent process to enable them to tailor information towards smokers in such a way that the patient may understand the risks involved with their surgical treatment. We update the literature with recently discovered methods of monitoring and treating the troublesome complications that occur more commonly in smokers effected by trauma.
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Affiliation(s)
- Timothy M Morris
- Orthoplastic Surgery Department, James Cook University Hospital, Marton Road, Middlesbrough, England, TS4 3BW.
| | - Fergal J Marlborough
- Orthoplastic Surgery Department, James Cook University Hospital, Marton Road, Middlesbrough, England, TS4 3BW
| | - Richard J Montgomery
- Orthoplastic Surgery Department, James Cook University Hospital, Marton Road, Middlesbrough, England, TS4 3BW
| | - Keith P Allison
- Orthoplastic Surgery Department, James Cook University Hospital, Marton Road, Middlesbrough, England, TS4 3BW
| | - William G P Eardley
- Orthoplastic Surgery Department, James Cook University Hospital, Marton Road, Middlesbrough, England, TS4 3BW
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Application of text mining to develop AOP-based mucus hypersecretion genesets and confirmation with in vitro and clinical samples. Sci Rep 2021; 11:6091. [PMID: 33731770 PMCID: PMC7969622 DOI: 10.1038/s41598-021-85345-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2020] [Accepted: 02/26/2021] [Indexed: 11/28/2022] Open
Abstract
Mucus hypersecretion contributes to lung function impairment observed in COPD (chronic obstructive pulmonary disease), a tobacco smoking-related disease. A detailed mucus hypersecretion adverse outcome pathway (AOP) has been constructed from literature reviews, experimental and clinical data, mapping key events (KEs) across biological organisational hierarchy leading to an adverse outcome. AOPs can guide the development of biomarkers that are potentially predictive of diseases and support the assessment frameworks of nicotine products including electronic cigarettes. Here, we describe a method employing manual literature curation supported by a focused automated text mining approach to identify genes involved in 5 KEs contributing to decreased lung function observed in tobacco-related COPD. KE genesets were subsequently confirmed by unsupervised clustering against 3 different transcriptomic datasets including (1) in vitro acute cigarette smoke and e-cigarette aerosol exposure, (2) in vitro repeated incubation with IL-13, and (3) lung biopsies from COPD and healthy patients. The 5 KE genesets were demonstrated to be predictive of cigarette smoke exposure and mucus hypersecretion in vitro, and less conclusively predict the COPD status of lung biopsies. In conclusion, using a focused automated text mining and curation approach with experimental and clinical data supports the development of risk assessment strategies utilising AOPs.
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23
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Sarles SE, Hensel EC, Robinson RJ. Surveillance of U.S. Corporate Filings Provides a Proactive Approach to Inform Tobacco Regulatory Research Strategy. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:3067. [PMID: 33809725 PMCID: PMC8002354 DOI: 10.3390/ijerph18063067] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/03/2021] [Accepted: 03/04/2021] [Indexed: 12/01/2022]
Abstract
The popularity of electronic cigarettes in the United States and around the world has led to a startling rise in youth nicotine use. The Juul® e-cigarette was introduced in the U.S. market in 2015 and had captured approximately 13% of the U.S. market by 2017. Unlike many other contemporary electronic cigarette companies, the founders behind the Juul® e-cigarette approached their product launch like a traditional high-tech start-up company, not like a tobacco company. This article presents a case study of Juul's corporate and product development history in the context of US regulatory actions. The objective of this article is to demonstrate the value of government-curated archives as leading indicators which can (a) provide insight into emergent technologies and (b) inform emergent regulatory science research questions. A variety of sources were used to gather data about the Juul® e-cigarette and the corporations that surround it. Sources included government agencies, published academic literature, non-profit organizations, corporate and retail websites, and the popular press. Data were disambiguated, authenticated, and categorized prior to being placed on a timeline of events. A timeline of four significant milestones, nineteen corporate filings and events, twelve US regulatory actions, sixty-four patent applications, eighty-seven trademark applications, twenty-three design patents and thirty-two utility patents related to Juul Labs and its associates is presented, spanning the years 2004 through 2020. This work demonstrates the probative value of findings from patent, trademark, and SEC filing literature in establishing a premise for emergent regulatory science research questions which may not yet be supported by traditional archival research literature. The methods presented here can be used to identify key aspects of emerging technologies before products actually enter the market; this shifting policy formulation and problem identification from a paradigm of being reactive in favor of becoming proactive. Such a proactive approach may permit anticipatory regulatory science research and ultimately shorten the elapsed time between market technology innovation and regulatory response.
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Affiliation(s)
- Samantha Emma Sarles
- Engineering Ph.D. Program, Rochester Institute of Technology, Rochester, NY 14623, USA;
| | - Edward C. Hensel
- Department of Mechanical Engineering, Rochester Institute of Technology, Rochester, NY 14623, USA;
| | - Risa J. Robinson
- Department of Mechanical Engineering, Rochester Institute of Technology, Rochester, NY 14623, USA;
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Navas-Acien A, Martinez-Morata I, Hilpert M, Rule A, Shimbo D, LoIacono NJ. Early Cardiovascular Risk in E-cigarette Users: the Potential Role of Metals. Curr Environ Health Rep 2020; 7:353-361. [PMID: 33242201 DOI: 10.1007/s40572-020-00297-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/04/2020] [Indexed: 01/18/2023]
Abstract
PURPOSE OF REVIEW Electronic cigarettes (e-cigs) are a source of metals. Epidemiologic and experimental evidence support that metals are toxic to the cardiovascular system. Little is known, however, about the role that e-cig metals may play as toxicants for the possible cardiovascular effects of e-cig use. The goal of this narrative review is to summarize the evidence on e-cig use and metal exposure and on e-cig use and cardiovascular toxicity and discuss the research needs. RECENT FINDINGS In vitro studies show cytotoxicity and increased oxidative stress in myocardial cells and vascular endothelial cells exposed to e-liquids and e-cig aerosols, with effects partially reversed with antioxidant treatment. There is some evidence that the heating coil plays a role in cell toxicity. Mice exposed to e-cigs for several weeks showed higher levels of oxidative stress, inflammation, platelet activation, and thrombogenesis. Cross-over clinical experiments show e-cig use alters nitric oxide-mediated flow-mediated dilation, endothelial progenitor cells, and arterial stiffness. Cross-sectional evidence from large nationally representative samples in the USA support that e-cig use is associated with self-reported myocardial infarction. Smaller studies found associations of e-cig use with higher oxidized low-density protein and heart variability compared to healthy controls. Numerous studies have measured elevated levels of toxic metals in e-cig aerosols including lead, nickel, chromium, and manganese. Arsenic has been measured in some e-liquids. Several of these metals are well known to be cardiotoxic. Numerous studies show that e-cigs are a source of cardiotoxic metals. Experimental studies (in vitro, in vivo, and clinical studies) show acute toxicity of e-cigs to the vascular system. Studies of long-term toxicity in animals and humans are missing. Longitudinal studies with repeated measures of metal exposure and subclinical cardiovascular outcomes (e.g., coronary artery calcification) could contribute to determine the long-term cardiovascular effects of e-cigs and the potential role of metals in those effects.
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Affiliation(s)
- Ana Navas-Acien
- Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, 722 W 168th Street, New York, NY, 10032, USA
| | - Irene Martinez-Morata
- Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, 722 W 168th Street, New York, NY, 10032, USA
| | - Markus Hilpert
- Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, 722 W 168th Street, New York, NY, 10032, USA
| | - Ana Rule
- Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD, USA
| | - Daichi Shimbo
- Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA
| | - Nancy J LoIacono
- Department of Environmental Health Sciences, Columbia University Mailman School of Public Health, 722 W 168th Street, New York, NY, 10032, USA.
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25
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Bishop E, Breheny D, Hewitt K, Taylor M, Jaunky T, Camacho OM, Thorne D, Gaça M. Evaluation of a high-throughput in vitro endothelial cell migration assay for the assessment of nicotine and tobacco delivery products. Toxicol Lett 2020; 334:110-116. [PMID: 32707277 DOI: 10.1016/j.toxlet.2020.07.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 07/07/2020] [Accepted: 07/09/2020] [Indexed: 12/17/2022]
Abstract
Endothelial cell migration is a critical process in the maintenance of healthy blood vessels. Impaired endothelial migration is reportedly associated with the development of cardiovascular diseases. Here, we report on the development of a 96-well in vitro endothelial migration assay for the purpose of comparative toxicological assessment of a novel THP relative to cigarette smoke, to be able to rapidly inform regulatory decision making. Uniform scratches were induced in confluent human umbilical vein endothelial cells using the 96-pin wound maker and exposed to 3R4F cigarette or THP aqueous extracts (AqE). Endothelial migration was recorded over 24 h, and the rate of wound closure calculated using mean relative wound density rather than migration rate as previously reported. This self-normalising parameter accounts for starting wound size, by comparing the density of the scratch to the outer region at each time-point. Furthermore, wound width acceptance criteria was defined to further increase the sensitivity of the assay. 3R4F and THP AqE samples were tested at comparable nicotine concentrations. 3R4F showed significant cytotoxicity and inhibition of wound healing whereas THP AqE did not show any response in either endpoint. This 96-well endothelial migration assay was suitably sensitive to distinguish combustible cigarette and THP test articles.
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Affiliation(s)
- Emma Bishop
- British American Tobacco, R&D, Southampton, SO15 8TL, UK.
| | - Damien Breheny
- British American Tobacco, R&D, Southampton, SO15 8TL, UK
| | | | - Mark Taylor
- British American Tobacco, R&D, Southampton, SO15 8TL, UK
| | - Tomasz Jaunky
- British American Tobacco, R&D, Southampton, SO15 8TL, UK
| | | | - David Thorne
- British American Tobacco, R&D, Southampton, SO15 8TL, UK
| | - Marianna Gaça
- British American Tobacco, R&D, Southampton, SO15 8TL, UK
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26
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Bozhilova S, Baxter A, Bishop E, Breheny D, Thorne D, Hodges P, Gaça M. Optimization of aqueous aerosol extract (AqE) generation from e-cigarettes and tobacco heating products for in vitro cytotoxicity testing. Toxicol Lett 2020; 335:51-63. [PMID: 33091563 DOI: 10.1016/j.toxlet.2020.10.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 09/22/2020] [Accepted: 10/14/2020] [Indexed: 10/23/2022]
Abstract
Electronic cigarettes (e-cigarettes) and tobacco heating products (THPs) have reduced yields of toxicants and have recently emerged as a potentially safer alternative to combustible cigarettes. To understand if reduced toxicant exposure is associated with reductions in biological responses, there is a need for high-quality pre-clinical in vitro studies. Here, we investigated the cytotoxic response of human umbilical vein endothelial cells to conventional cigarette aqueous aerosol extracts (AqE) and highly concentrated AqEs from e-cigarettes (two generations of atomisers) and THPs (two variants). All AqE samples were generated by a standardized methodology and characterized for nicotine, propylene glycol and vegetable glycerol. The cigarette AqE caused a maximum 100 ± 0.00 % reduction in cell viability at 35 % dose (2.80 puffs) as opposed to 96.63 ± 2.73 % at 50 % (20 puffs) and 99.85 ± 0.23 % at 75 % (30 puffs) for the two THP variants (glo Bright Tobacco, glo Rich Tobacco), and 99.07 ± 1.61 % at the neat ePen2.0 e-cigarette (200 puffs). The AqE of the remaining e-cigarettes either resulted in an incomplete dose-response or did not elicit any response. The methods utilized were suitably sensitive to not only differentiate between cigarette, THP and e-cigarette aerosols but also to distinguish between products within each product category.
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Affiliation(s)
- Stela Bozhilova
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK.
| | - Andrew Baxter
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - Emma Bishop
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - Damien Breheny
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - David Thorne
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - Paul Hodges
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - Marianna Gaça
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
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27
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Smart DJ, Phillips G. Collecting e-cigarette aerosols for in vitro applications: A survey of the biomedical literature and opportunities to increase the value of submerged cell culture-based assessments. J Appl Toxicol 2020; 41:161-174. [PMID: 33015847 PMCID: PMC7756347 DOI: 10.1002/jat.4064] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Revised: 08/11/2020] [Accepted: 08/18/2020] [Indexed: 12/11/2022]
Abstract
Electronic nicotine delivery systems (ENDS) are being developed as potentially reduced‐risk alternatives to the continued use of combustible tobacco products. Because of the widespread uptake of ENDS—in particular, e‐cigarettes—the biological effects, including the toxic potential, of their aerosols are under investigation. Preclinically, collection of such aerosols is a prerequisite for testing in submerged cell culture‐based in vitro assays; however, despite the growth in this research area, there is no apparent standardized collection method for this application. To this end, through an Institute for in vitro Sciences, Inc. workshop initiative, we surveyed the biomedical literature catalogued in PubMed® to map the types of methods hitherto used and reported publicly. From the 47 relevant publications retrieved, we identified seven distinct collection methods. Bubble‐through (with aqueous solvents) and Cambridge filter pad (CFP) (with polar solvents) collection were the most frequently cited methods (57% and 18%, respectively), while the five others (CFP + bubble‐through; condensation; cotton filters; settle‐upon; settle‐upon + dry) were cited less often (2–10%). Critically, the collected aerosol fractions were generally found to be only minimally characterized chemically, if at all. Furthermore, there was large heterogeneity among other experimental parameters (e.g., vaping regimen). Consequently, we recommend that more comprehensive research be conducted to identify the method(s) that produce the fraction(s) most representative of the native aerosol. We also endorse standardization of the aerosol generation process. These should be regarded as opportunities for increasing the value of in vitro assessments in relation to predicting effects on human health. Collection of e‐cigarette aerosols is a prerequisite to enable testing in submerged culture‐based in vitro assays; however, there is no standardized method for this. Thus, we surveyed the biomedical literature to map the types of published methods. Bubble‐through and Cambridge filter pad methods were most common, although there was heterogeneity among other parameters, and moreover, the resulting fractions were only minimally characterized. Comprehensive research is required to identify the method(s) that produce the fraction(s) most representative of the native aerosol.
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Affiliation(s)
- Daniel J Smart
- PMI R&D, Philip Morris Products SA, Neuchâtel, Switzerland
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28
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Dalrymple A, Badrock TC, Terry A, Bean EJ, Barber M, Hall PJ, Coburn S, McAughey J, Murphy J. Development of a novel method to measure material surface staining by cigarette, e-cigarette or tobacco heating product aerosols. Heliyon 2020; 6:e05012. [PMID: 32995648 PMCID: PMC7511806 DOI: 10.1016/j.heliyon.2020.e05012] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 08/21/2020] [Accepted: 09/17/2020] [Indexed: 11/25/2022] Open
Abstract
Tobacco smoke (CS) may visually stain indoor surfaces including ceilings, walls and soft furnishings over time. Potentially reduced risk products (PRRPs) such as e-cigarettes (EC) and tobacco heating products (THP) produce chemically less complex aerosols with significantly reduced levels of toxicants, particles and odour. However, the potential effects of EC and THP aerosols on the staining of indoor surfaces are currently unknown. In this study, an exposure chamber was developed as a model system to enable the accelerated staining of wallpaper and cotton samples by a scientific reference cigarette (3R4F), three THP (glo™, glo™ pro, glo™ sens) and an e-cigarette (iSwitch Maxx). Exposure to 3R4F reference cigarettes caused the greatest level of staining, which was significantly higher than glo™, glo™ pro, glo™ sens or iSwitch Maxx aerosols, all of which showed relatively little colour change. Exposure to 200–1000 puffs of 3R4F cigarette smoke resulted in a visible dose response effect to wallpaper and cotton samples which was not observed following exposure to glo™, glo™ pro, glo™ sens or iSwitch Maxx aerosols. Aging of the samples for 4 weeks post-exposure resulted in changes to the staining levels, however PRRP staining levels were minimal and significantly lower than 3R4F exposed samples. For the first time, diverse PRRPs across the tobacco and nicotine products risk continuum have been assessed in vitro for their impact on surface staining. CS exposure significantly increased the level of wallpaper and cotton staining, whereas exposure to glo™, glo™ pro, glo™ sens or iSwitch Maxx aerosols resulted in significantly reduced levels of staining, staining levels were also comparable to untreated control samples.
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Affiliation(s)
- Annette Dalrymple
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
- Corresponding author.
| | | | - Anya Terry
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - Emma-Jayne Bean
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - Mark Barber
- Borgwaldt KC GmbH Schnackenburgallee 15, 22525, Hamburg, Germany
| | - Peter J. Hall
- Intertek Clinical Research Services, Hooton, Cheshire, CH66 7NZ, UK
| | - Steven Coburn
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - John McAughey
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
| | - James Murphy
- British American Tobacco, R&D, Southampton, Hampshire, SO15 8TL, UK
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29
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Buchanan ND, Grimmer JA, Tanwar V, Schwieterman N, Mohler PJ, Wold LE. Cardiovascular risk of electronic cigarettes: a review of preclinical and clinical studies. Cardiovasc Res 2020; 116:40-50. [PMID: 31696222 DOI: 10.1093/cvr/cvz256] [Citation(s) in RCA: 88] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 08/08/2019] [Accepted: 10/04/2019] [Indexed: 12/13/2022] Open
Abstract
Cigarette smoking is the most preventable risk factor related to cardiovascular morbidity and mortality. Tobacco usage has declined in recent years; however, the use of alternative nicotine delivery methods, particularly e-cigarettes, has increased exponentially despite limited data on their short- and long-term safety and efficacy. Due to their unique properties, the impact of e-cigarettes on cardiovascular physiology is not fully known. Here, we summarize both preclinical and clinical data extracted from short- and long-term studies on the cardiovascular effects of e-cigarette use. Current findings support that e-cigarettes are not a harm-free alternative to tobacco smoke. However, the data are primarily derived from acute studies. The impact of chronic e-cigarette exposure is essentially unstudied. To explore the uniqueness of e-cigarettes, we contemplate the cardiovascular effects of individual e-cigarette constituents. Overall, data suggest that exposure to e-cigarettes could be a potential cardiovascular health concern. Further preclinical research and randomized trials are needed to expand basic and clinical investigations before considering e-cigarettes safe alternatives to conventional cigarettes.
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Affiliation(s)
- Nicholas D Buchanan
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, 473 W. 12th Avenue, Columbus, OH 43210, USA.,College of Nursing, The Ohio State University, Columbus, OH, USA
| | - Jacob A Grimmer
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, 473 W. 12th Avenue, Columbus, OH 43210, USA.,College of Nursing, The Ohio State University, Columbus, OH, USA
| | - Vineeta Tanwar
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, 473 W. 12th Avenue, Columbus, OH 43210, USA.,College of Nursing, The Ohio State University, Columbus, OH, USA
| | - Neill Schwieterman
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, 473 W. 12th Avenue, Columbus, OH 43210, USA.,College of Nursing, The Ohio State University, Columbus, OH, USA
| | - Peter J Mohler
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, 473 W. 12th Avenue, Columbus, OH 43210, USA.,Department of Physiology and Cell Biology, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH, USA
| | - Loren E Wold
- Dorothy M. Davis Heart and Lung Research Institute, College of Medicine, The Ohio State University, 473 W. 12th Avenue, Columbus, OH 43210, USA.,College of Nursing, The Ohio State University, Columbus, OH, USA.,Department of Physiology and Cell Biology, The Ohio State University College of Medicine and Wexner Medical Center, Columbus, OH, USA
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Kuntic M, Hahad O, Daiber A, Münzel T. Could E-cigarette vaping contribute to heart disease? Expert Rev Respir Med 2020; 14:1131-1139. [PMID: 32757856 DOI: 10.1080/17476348.2020.1807332] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
INTRODUCTION E-cigarettes have become a controversial topic. While their benefits are questioned by the scientific community, a part of the medical profession is still supporting them as an effective harm reduction tool for smoking cessation. The impact of E-cigarettes on the cardiovascular system is still elusive. AREAS COVERED We assessed results from animal, pre(clinical), and epidemiological studies to critically evaluate and synthesize evidence relevant to the cardiovascular effects of E-cigarettes. Animal studies have demonstrated that E-cigarette vapor exposure can cause endothelial and cardiac dysfunction. However, there have also been reports on the less harmful effects of E-cigarette vapor exposure in comparison to classical tobacco cigarettes. Measurements of flow-mediated dilation in acute human exposure settings have mostly demonstrated that E-cigarettes cause vascular endothelial dysfunction. Epidemiological studies have shown that E-cigarette use is associated with an increased risk for cardiovascular disease, although switching from classical tobacco cigarettes to E-cigarettes can have beneficial cardiovascular effects. Misinterpretation of scientific data by activists on either side is another problem. EXPERT OPINION In conclusion, we need more and better (pre)clinical data comparing the health effects of E-cigarette vaping as compared with tobacco cigarette smoking, in order to counsel the legislation for better health policies.
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Affiliation(s)
- Marin Kuntic
- Department of Cardiology, University Medical Center of the Johannes Gutenberg-University Mainz , Mainz, Germany
| | - Omar Hahad
- Department of Cardiology, University Medical Center of the Johannes Gutenberg-University Mainz , Mainz, Germany.,German Center for Cardiovascular Research (DZHK), Partnersite Rhine-Main , Mainz, Germany
| | - Andreas Daiber
- Department of Cardiology, University Medical Center of the Johannes Gutenberg-University Mainz , Mainz, Germany.,German Center for Cardiovascular Research (DZHK), Partnersite Rhine-Main , Mainz, Germany
| | - Thomas Münzel
- Department of Cardiology, University Medical Center of the Johannes Gutenberg-University Mainz , Mainz, Germany.,German Center for Cardiovascular Research (DZHK), Partnersite Rhine-Main , Mainz, Germany
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Breheny D, Thorne D, Baxter A, Bozhilova S, Jaunky T, Santopietro S, Taylor M, Terry A, Gaça M. The in vitro assessment of a novel vaping technology. Toxicol Rep 2020; 7:1145-1156. [PMID: 32983902 PMCID: PMC7494588 DOI: 10.1016/j.toxrep.2020.08.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/26/2020] [Accepted: 08/18/2020] [Indexed: 11/17/2022] Open
Abstract
We have developed a novel vaping product (NVP) IS1.0(TT), which utilises a stainless-steel mesh to transfer and vaporise the e-liquid, mitigating some of the potential sources of toxicants that can be generated using the more traditional 'wick and coil' approach. The emissions from IS1.0(TT) have previously been found to have lower levels of toxicants overall when directly compared with a commercial wick and coil e-cig. This current study assessed the toxicological responses to aerosols from this NVP. Responses induced by IS1.0(TT)were compared to those from a 3R4F reference cigarette, using in vitro test methods which included regulatory genetic toxicological assays as well as some more contemporary screening approaches. The experimental conditions were designed to facilitate the testing of aerosol from this vaping product at doses that in most cases greatly exceeded those of the 3R4F comparator showed little to no toxicological responses and demonstrated significantly reduced effects in these in vitro assays when compared to 3R4F. Furthermore, the extreme doses tested in the present study indicate that the toxicant profile of this NVP translates to lower biological activity in vitro, and suggests that the absolute risk hazard level associated with electronic cigarettes can be reduced through continuous improvement as the technology evolves.
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Key Words
- ACM, aerosol collected mass
- ALI, air-liquid interface
- ANOVA, analysis of variance
- ARE, antioxidant response element
- Aerosol
- AqE, aerosol aqueous extract
- AqE, aqueous aerosol extracts
- CRM81, CORESTA recommended method number 81
- Cigarette
- DCF, 2′,7′ dichlorodihydrofluorescein
- DMSO, dimethyl sulfoxide
- DSB, double-strand break
- Electronic cigarette
- FDA, US Food and Drug Administration
- GEF, global evaluation factor
- GSH, glutathione (reduced form)
- HCI, Health Canada Intense
- HUVEC, human umbilical vein endothelial cell
- ISO, International Organisation for Standardisation
- IVMn, in vitro micronucleus
- In vitro
- MF, mutant frequency
- MLA, mouse lymphoma assay
- NASEM, US National Academy of Sciences, Engineering and Medicine
- NHBE, normal human bronchial epithelial
- NRU, neutral red uptake
- NVP, new vapour product
- RWD, relative wound density
- S9, post-mitochondrial supernatant
- TPA, 12-O-tetradecanoylphorbol-13-acetate
- TPM, total particulate matter
- TobReg, WHO Study Group on Tobacco Product Regulation
- WA, whole aerosol
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Xu M, Zhang H, Yu N, Dong Y, Wang W, Chen Y, Kang J. Cigarette smoke extract induces the Pseudomonas aeruginosa nfxC drug-resistant phenotype. J Infect Chemother 2020; 26:1278-1282. [PMID: 32800691 DOI: 10.1016/j.jiac.2020.07.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 07/09/2020] [Accepted: 07/23/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND There is clinical and epidemiological evidence indicating that cigarette smoke exposure can significantly increase the usage of antibiotics by smokers to treat pulmonary infections, suggesting an increased risk of bacterial drug resistance. Pseudomonas aeruginosa is commonly found in infectious diseases closely related to cigarette smoke exposure and frequently acquires drug resistance. Recently, a study has demonstrated that cigarette smoke extract may induce Pseudomonas aeruginosa antibiotic resistance but the mechanism remain unknown. OBJECTIVES To explore the effect of cigarette smoke exposure on drug resistance in P. aeruginosa and the underlying mechanism using an in vitro model of cigarette smoke extract (CSE) exposure. METHODS P. aeruginosa strains PAO1, PA103 and ATCC27853 were used in this study. Changes in drug resistance in P. aeruginosa after CSE exposure were evaluated by antimicrobial susceptibility tests. Additionally, differentially expressed genes related to drug resistance were detected by transcriptome sequencing and qRT-PCR. RESULTS CSE increased both the MIC and MBC of levofloxacin and imipenem (MIC was not changed in ATCC 27853) against P. aeruginosa. However, CSE could only increase the minimum inhibitory concentration of tigecycline and minocycline against P. aeruginosa. Transcriptome sequencing and qRT-PCR indicated that MvaT and OprD levels decreased and MexEF-OprN levels increased. CONCLUSIONS Overall, our results showed that CSE may induce antibiotic resistance in P. aeruginosa. The results of antimicrobial susceptibility tests, transcriptome sequencing and qRT-PCR showed that CSE induced P. aeruginosa to the nfxC drug-resistant phenotype.
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Affiliation(s)
- Mingtao Xu
- Institute of Respiratory Diseases, The First Hospital of China Medical University, Shenyang, China
| | - Hanyin Zhang
- Institute of Respiratory Diseases, The First Hospital of China Medical University, Shenyang, China
| | - Na Yu
- Institute of Respiratory Diseases, The First Hospital of China Medical University, Shenyang, China
| | - Ying Dong
- Department of Pulmonary and Critical Care Medicine, Shengjing Hospital of China Medical University, Shenyang, China
| | - Wei Wang
- Institute of Respiratory Diseases, The First Hospital of China Medical University, Shenyang, China
| | - Yu Chen
- Department of Pulmonary and Critical Care Medicine, Shengjing Hospital of China Medical University, Shenyang, China.
| | - Jian Kang
- Institute of Respiratory Diseases, The First Hospital of China Medical University, Shenyang, China.
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Xiao L, Parascandola M, Wang C, Jiang Y. Perception and Current Use of E-cigarettes Among Youth in China. Nicotine Tob Res 2020; 21:1401-1407. [PMID: 30053201 DOI: 10.1093/ntr/nty145] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 07/19/2018] [Indexed: 12/27/2022]
Abstract
INTRODUCTION This study provides nationally representative estimates of electronic cigarette (e-cigarette) use among youth in China and explores the factors associated with awareness and use of e-cigarettes and the relationship between e-cigarette and conventional tobacco use. METHODS This study examined data from the Global Youth Tobacco Survey, which was completed by 155 117 middle school students (51.8% boys and 48.2% girls) in China, and employed a multistage stratified cluster sampling design. For data analysis, SAS 9.3 complex survey procedures were used, and logistic regression was used to explore factors associated with e-cigarette use and the relationship between e-cigarette and conventional tobacco use. RESULTS About 45.0% of middle school students had heard of e-cigarettes, but only 1.2% reported using e-cigarettes in the last 30 days. Among never-smokers, e-cigarette users were more likely to intend to use a tobacco product in the next 12 months than nonusers (adjusted odds ratio [OR] = 6.970, 95% confidence interval [CI] = 4.474% to 10.857%), and more likely to say that they would enjoy smoking a cigarette (adjusted OR = 14.633, 95% CI = 11.328% to 18.902%). E-cigarette use was associated with previous experimentation with cigarette smoking (OR = 3.2), having noticed tobacco advertising in the past 30 days (OR = 2.7), having close friends who smoke (OR = 1.4), and thinking tobacco helps people feel more comfortable in social situations (OR = 3.3) and makes young people look more attractive (OR = 1.3). CONCLUSIONS E-cigarette use among youth in China remains low but awareness is high. E-cigarette use was associated with increased intentions to use tobacco. Enhanced prevention efforts are needed targeting e-cigarette use among youth. IMPLICATIONS This study is the first nationally representative survey of e-cigarette use among youth in China. It found that among middle school students, prevalence of e-cigarette use is 1.2% and prevalence of e-cigarette awareness is 45.0%. Chinese youths use e-cigarettes as a tobacco product rather than an aid to quitting. Among never-smokers, e-cigarette users were more likely to have intentions to use a tobacco product in the next 12 months, more likely to use a tobacco product offered by their best friends and enjoy smoking a cigarette than nonusers.
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Affiliation(s)
- Lin Xiao
- Tobacco Control Office, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Mark Parascandola
- Tobacco Control Research Branch, National Cancer Institute, Rockville, MD
| | - Congxiao Wang
- Tobacco Control Office, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Yuan Jiang
- Tobacco Control Office, Chinese Center for Disease Control and Prevention, Beijing, China
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Abstract
With the rapid increase in electronic cigarette (e-cig) users worldwide, secondhand exposure to e-cig aerosols has become a serious public health concern. We summarize the evidence on the effects of e-cigs on indoor air quality, chemical compositions of mainstream and secondhand e-cig aerosols, and associated respiratory and cardiovascular effects. The use of e-cigs in indoor environments leads to high levels of fine and ultrafine particles similar to tobacco cigarettes (t-cigs). Concentrations of chemical compounds in e-cig aerosols are generally lower than those in t-cig smoke, but a substantial amount of vaporized propylene glycol, vegetable glycerin, nicotine, and toxic substances, such as aldehydes and heavy metals, has been reported. Exposures to mainstream e-cig aerosols have biologic effects but only limited evidence shows adverse respiratory and cardiovascular effects in humans. Long-term studies are needed to better understand the dosimetry and health effects of exposures to secondhand e-cig aerosols.
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Affiliation(s)
- Liqiao Li
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, California 90095-1772, USA;
| | - Yan Lin
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, California 90095-1772, USA;
| | - Tian Xia
- Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, California 90095-1772, USA
| | - Yifang Zhu
- Department of Environmental Health Sciences, Jonathan and Karin Fielding School of Public Health, University of California, Los Angeles, California 90095-1772, USA;
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Nicol J, Fraser R, Walker L, Liu C, Murphy J, Proctor CJ. Comprehensive Chemical Characterization of the Aerosol Emissions of a Vaping Product Based on a New Technology. Chem Res Toxicol 2020; 33:789-799. [PMID: 32122129 PMCID: PMC7308067 DOI: 10.1021/acs.chemrestox.9b00442] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
Around 10 million people in the United
States and 3 million people
in the United Kingdom are estimated to use vaping category products.
There are some estimates that there will be 75–80 million vapers
worldwide by 2020. Most of these products are based on coil-and-wick
technology. Because the heating and aerosol formation are separate
processes, the system can lead to dry-wicking and elevated emission
of carbonyls if designed and/or manufactured poorly. Low-nicotine
and low-power coil-and-wick devices have also been linked to increased
exposure to formaldehyde due to compensatory behavior by users. We
characterized the emissions of a vaping product which uses a fabric-free
stainless-steel mesh distiller plate technology that heats and aerosolizes
the e-liquid in a single process. The plate has a microporous structure
for capillary-induced liquid transformation (wicking) and aerosolization
that is optimized to avoid fluid starvation and overheating and improved
control. Compared with emissions previously reported for a coil-and-wick
nicotine vaping product (e-cigarette), most classes of harmful and
potentially harmful constituents (HPHCs) from this vaping product
were below the level of detection or quantification. For those that
were quantifiable, this vaping product generally had lower levels
of emissions than the e-cigarette, including carbonyls. Formaldehyde
and methyl glyoxal levels did not differ significantly between vaping
products. In this system, the single mode of liquid transfer and vapor
formation permits high aerosol mass delivery but further reduces emissions
of HPHCs that may be present in conventional e-cigarette aerosol,
by lessening the risk of thermal breakdown of the aerosol-generating
solvent mixture.
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Affiliation(s)
- James Nicol
- JTN Consulting Limited, 272 Bath Street, Glasgow, Scotland G2 4JR
| | - Rory Fraser
- British American Tobacco R&D Centre, Reagents Park Road, Southampton SO15 8TL, United Kingdom
| | - Liam Walker
- British American Tobacco R&D Centre, Reagents Park Road, Southampton SO15 8TL, United Kingdom
| | - Chuan Liu
- British American Tobacco R&D Centre, Reagents Park Road, Southampton SO15 8TL, United Kingdom
| | - James Murphy
- British American Tobacco R&D Centre, Reagents Park Road, Southampton SO15 8TL, United Kingdom
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Nicotine Suppresses the Invasiveness of Human Trophoblasts by Downregulation of CXCL12 Expression through the Alpha-7 Subunit of the Nicotinic Acetylcholine Receptor. Reprod Sci 2020; 27:916-924. [PMID: 31933163 PMCID: PMC7077928 DOI: 10.1007/s43032-019-00095-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 08/07/2019] [Indexed: 12/20/2022]
Abstract
Smoke exposure during pregnancy has detrimental effects upon numerous fetal and neonatal outcomes. Nicotine (the main component of tobacco) has been suggested to affect placental development. During placental development, efficient invasion by trophoblasts is required for establishment of the fetus–maternal circulation. In this study we explored the regulation of trophoblast invasion by nicotine. An immortalized first trimester extravillous trophoblast cell line (HTR-8/SVneo cells) was used for all the experiments, which were treated by nicotine, methyllycaconitine, and C-X-C motif chemokine ligand 12 (CXCL12). Total RNA and protein were used to study the expressions of nicotinic acetylcholine receptors (nAChRs), and transwell assay was used to study invasiveness. Changes of RNA expression due to nicotine treatment were detected by RNA sequence. Level of CXCL12 mRNA was verified by quantitative PCR. We showed that HTR-8/SVneo expressed subunits α2–4, α7, α9, β1, and β2 of nAChRs. Nicotine downregulated CXCL12 expression and inhibited trophoblast invasion. Methyllycaconitine, as an antagonist of the α7 homopolymer, blocked the inhibitory effect of nicotine. CXCL12 could rescue the nicotine-induced inhibitory effect on invasion of HTR-8/SVneo cells. These results suggest that the α7 subunit of the nAChR has important roles in modulating trophoblast invasion through CXCL12.
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37
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D'Amario D, Migliaro S, Borovac JA, Vergallo R, Galli M, Restivo A, Bonini M, Romagnoli E, Leone AM, Crea F. Electronic Cigarettes and Cardiovascular Risk: Caution Waiting for Evidence. Eur Cardiol 2019; 14:151-158. [PMID: 31933682 PMCID: PMC6950284 DOI: 10.15420/ecr.2019.16.2] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Accepted: 05/29/2019] [Indexed: 12/30/2022] Open
Abstract
Electronic cigarettes use is a growing trend in contemporary societies, with the propensity to compete with traditional tobacco smoking. Some preclinical studies demonstrated the toxic and detrimental effects of electronic cigarettes liquid components. Its impact on human health remains unknown and insufficiently studied. While some studies suggest that electronic cigarettes use might be associated with endothelial dysfunction, impaired platelet function and increased risk of adverse clinical events, other studies did not confirm these findings and epidemiological data mostly suggest that the use of electronic cigarettes appears to be safer than that of traditional tobacco cigarettes. This article provides an up-to-date overview of the current state of knowledge regarding electronic cigarettes and their impact on human health, with special emphasis on their effect on cardiovascular diseases.
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Affiliation(s)
- Domenico D'Amario
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Stefano Migliaro
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Josip Andjelo Borovac
- Department of Pathophysiology, University Hospital of Split Split, Croatia.,Department of Cardiology, University Hospital of Split Split, Croatia
| | - Rocco Vergallo
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Mattia Galli
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Attilio Restivo
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Matteo Bonini
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Enrico Romagnoli
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Antonio Maria Leone
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
| | - Filippo Crea
- Department of Cardiovascular and Thoracic Sciences, Fondazione Policlinico Universitario A Gemelli IRCCS Rome, Italy
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38
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Mallock N, Pieper E, Hutzler C, Henkler-Stephani F, Luch A. Heated Tobacco Products: A Review of Current Knowledge and Initial Assessments. Front Public Health 2019; 7:287. [PMID: 31649912 PMCID: PMC6795920 DOI: 10.3389/fpubh.2019.00287] [Citation(s) in RCA: 54] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 09/20/2019] [Indexed: 01/29/2023] Open
Abstract
The health risks of tobacco smoking have been documented in numerous studies and smoking rates have declined in developed countries over the last 50 years. Today, we know that cigarette smoking is the major cause of preventable deaths due to tobacco smoke induced diseases. As a consequence of an increased awareness of smoking-related health risks, heated tobacco products (HTPs) are marketed as reduced toxicant alternatives to conventional tobacco products. Manufacturers claim that levels of toxicants and hazardous compounds are significantly reduced, implying that inhalation of the modified aerosol is less harmful compared to conventional cigarettes. In this manuscript, previous assessments of HTPs are briefly summarized, including a short discussion on challenges with the adaption of standard analytical methods used for tobacco smoke. The reliability of analytical data is important for risk assessment approaches that are based on reduced toxicant exposure. In order to assess a putative reduction of health risks, an integrated study design is required that should include clinical studies and epidemiology data. One manufacturer applied for a classification as a Modified Risk Tobacco Product (MRTP) in the United States, based on extensive toxicological studies that have also been published. However, data are not yet sufficient for a reliable assessment or recognition of putatively reduced health risks. Challenges regarding a classification in Europe are also discussed briefly in this review.
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Affiliation(s)
- Nadja Mallock
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Elke Pieper
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Christoph Hutzler
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Frank Henkler-Stephani
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Andreas Luch
- Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany
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39
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Kennedy CD, van Schalkwyk MCI, McKee M, Pisinger C. The cardiovascular effects of electronic cigarettes: A systematic review of experimental studies. Prev Med 2019; 127:105770. [PMID: 31344384 DOI: 10.1016/j.ypmed.2019.105770] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 06/18/2019] [Accepted: 07/12/2019] [Indexed: 01/06/2023]
Abstract
BACKGROUND Smoking is responsible for substantial cardiovascular morbidity and mortality. Electronic cigarettes have been advocated as a means to reduce this disease burden; by reducing exposure to harmful substances in smokers who are unable to quit. Concerns have been raised however, about cardiovascular effects of their use, with inhalants containing carbonyls and fine particulate matter. We systematically reviewed experimental studies of in vitro, animal, and human cardiovascular effects associated with electronic cigarette use. METHODS A literature search was conducted using Ovid MEDLINE & Embase databases, identifying experimental studies investigating cardiovascular effects of electronic cigarette use. Subsequently, Cochrane Risk of Bias tools were used to assess study quality. Any differences in outcomes by conflict of interest and risk of bias status were sought. RESULTS 38 studies were included, investigating animals (n=6), humans (n=24) and human cardiovascular cells in vitro (n=8). 74.3% of studies found potentially harmful effects. Increased sympathetic nerve activity was observed in human studies, whilst platelet haemostatic processes, reactive oxygen species production and endothelial dysfunction were reported across all study types. Studies with conflicts of interest or median-high risk of bias were less likely to identify potentially harmful effects (p=0.0007, p=0.04 respectively). DISCUSSION Most studies suggest potential for cardiovascular harm from electronic cigarette use, through mechanisms that increase risk of thrombosis and atherosclerosis. Notably, studies with conflicts of interest are significantly less likely to identify concerning cardiovascular effects. Included studies examine healthy, adult participants, limiting generalisation to potential high-risk groups including individuals with established cardiovascular disease or young, non-smokers.
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Affiliation(s)
- Ciaran D Kennedy
- Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
| | - May C I van Schalkwyk
- Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
| | - Martin McKee
- Faculty of Public Health and Policy, London School of Hygiene and Tropical Medicine, London, UK
| | - Charlotta Pisinger
- Center for Clinical Research and Prevention, Bispebjerg-Frederiksberg University Hospital, Capital Region of Denmark, Denmark; Danish Heart Foundation, Copenhagen, Denmark; University of Copenhagen, Faculty of Health and Medical Science, Denmark.
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40
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Chen IL, Todd I, Fairclough LC. Immunological and pathological effects of electronic cigarettes. Basic Clin Pharmacol Toxicol 2019; 125:237-252. [PMID: 30861614 DOI: 10.1111/bcpt.13225] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 03/04/2019] [Indexed: 12/12/2022]
Abstract
Electronic cigarettes (E-cigarettes) are considered a preferable alternative to conventional cigarettes due to the lack of combustion and the absence of tobacco-specific toxicants. E-cigarettes have rapidly gained in popularity in recent years amongst both existing smokers and previous non-smokers. However, a growing literature demonstrates that E-cigarettes are not as safe as generally believed. Here, we discuss the immunological, and other, deleterious effects of E-cigarettes on a variety of cell types and host defence mechanisms in humans and in murine models. We review not only the effects of complete E-cigarette liquids, but also each of the main components-nicotine, humectants and flavourings. This MiniReview thus highlights the possible role of E-cigarettes in the pathogenesis of disease and raises awareness of the potential harm that E-cigarettes may cause.
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Affiliation(s)
- I-Ling Chen
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Ian Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK
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41
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Robayo-González CX, Becerra N, Castro-Goyes DF. [Effects of electronic cigarettes on health. A literature review]. ACTA ACUST UNITED AC 2019; 21:115-121. [PMID: 33206918 DOI: 10.15446/rsap.v21n1.77032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 12/28/2018] [Indexed: 12/20/2022]
Abstract
OBJECTIVE To identify the most recent literature on electronic cigarettes (EC) available in the market, in order to characterize their composition, current use, health risks associated with their use, as well as their possible use as smoking cessation therapy. To generate a greater understanding of EC and their importance in the field of public health. MATERIALS AND METHODS A literature review was performed in indexed databases using MeSH and DeCS terms, finding 55 articles that met the inclusion criteria and five additional reviews of companies or governmental bodies. RESULTS The diversity of the types and components of electronic cigarettes has increased awareness of their use. So far, the increase in EC consumption worldwide has led many organizations to issue concepts and review different types of studies that show evidence of a discrepancy between what is offered and what is presented. Consequently, it is clear that a definitive concept of their use cannot be issued. CONCLUSIONS The increase in the use of electronic cigarettes worldwide has triggered alarms on the regulation of contents, presentations, effects on health, and possible recommendations for their use, making it necessary to better review the issue in order to give a clear concept to the public.
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Affiliation(s)
| | - Nelci Becerra
- NB. MD. Javesalud IPS. Clínica para dejar de fumar - Pontificia Universidad Javeriana. Bogotá, Colombia.
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42
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Adamson J, Jaunky T, Thorne D, Gaça MD. Characterisation of the borgwaldt LM4E system for in vitro exposures to undiluted aerosols from next generation tobacco and nicotine products (NGPs). Food Chem Toxicol 2018; 113:337-344. [PMID: 29421647 DOI: 10.1016/j.fct.2018.02.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Revised: 02/02/2018] [Accepted: 02/03/2018] [Indexed: 12/30/2022]
Abstract
Traditional in vitro exposure to combustible tobacco products utilise exposure systems that include the use of smoking machines to generate, dilute and deliver smoke to in vitro cell cultures. With reported lower emissions from next generation tobacco and nicotine products (NGPs), including e-cigarettes and tobacco heating products (THPs), diluting the aerosol is potentially not required. Herein we present a simplified exposure scenario to undiluted NGP aerosols, using a new puffing system called the LM4E. Nicotine delivery from an e-cigarette was used as a dosimetry marker, and was measured at source across 4 LM4E ports and in the exposure chamber. Cell viability studies, using Neutral Red Uptake (NRU) assay, were performed using H292 human lung epithelial cells, testing undiluted aerosols from an e-cigarette and a THP. E-cigarette mean nicotine generated at source was measured at 0.084 ± 0.005 mg/puff with no significant differences in delivery across the 4 different ports, p = 0.268 (n = 10/port). Mean nicotine delivery from the e-cigarette to the in vitro exposure chamber (measured up to 100 puffs) was 0.046 ± 0.006 mg/puff, p = 0.061. Aerosol penetration within the LM4E was 55% from source to chamber. H292 cells were exposed to undiluted e-cigarette aerosol for 2 h (240 puffs) or undiluted THP aerosol for 1 h (120 puffs). There were positive correlations between puff number and nicotine in the exposed culture media, R2 = 0.764 for the e-cigarette and R2 = 0.970 for the THP. NRU determined cell viability for e-cigarettes after 2 h' exposure resulted in 21.5 ± 17.0% cell survival, however for the THP, full cytotoxicity was reached after 1-h exposure.
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Affiliation(s)
- Jason Adamson
- British American Tobacco Research & Development Centre, Regents Park Rd, Southampton, SO15 8TL, UK.
| | - Tomasz Jaunky
- British American Tobacco Research & Development Centre, Regents Park Rd, Southampton, SO15 8TL, UK
| | - David Thorne
- British American Tobacco Research & Development Centre, Regents Park Rd, Southampton, SO15 8TL, UK
| | - Marianna D Gaça
- British American Tobacco Research & Development Centre, Regents Park Rd, Southampton, SO15 8TL, UK
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43
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Peitsch MC, Polosa R, Proctor C, Hassler T, Gaca M, Hill E, Hoeng J, Hayes AW. Next-generation tobacco and nicotine products. TOXICOLOGY RESEARCH AND APPLICATION 2018. [DOI: 10.1177/2397847318773701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A framework for the assessment of novel next-generation tobacco and nicotine products with the potential to reduce health risks compared with cigarettes should integrate scientific studies incorporating nonclinical, clinical, and population studies approaches. These products should have lower emissions and exhibit reduced biological effects compared with those of cigarettes, ideally approaching those of smoking cessation. The products should also be acceptable cigarette alternatives for current smokers, while not appealing to nonsmokers or former smokers. Validating harm reduction and promoting regulatory acceptance of the assessment methods require a collaborative approach by industry, independent reviewers, the public health community, and regulatory agencies. This article summarizes the science and approaches applied and considered to substantiate tobacco harm reduction in the light of regulatory requirements, presented at the 53rd Congress of the European Societies of Toxicology, 2017.
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Affiliation(s)
- Manuel C Peitsch
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - Riccardo Polosa
- Dipartimento di Medicina Clinica e Sperimentale, University of Catania, Catania, Italy
| | - Christopher Proctor
- British American Tobacco (Investments) Ltd., Group Research and Development, Southampton, UK
| | - Thord Hassler
- Swedish Match, European Division, Gothenburg, Sweden
| | - Marianna Gaca
- British American Tobacco (Investments) Ltd., Group Research and Development, Southampton, UK
| | - Erin Hill
- Institute for In Vitro Sciences, Inc., Gaithersburg, MD, USA
| | - Julia Hoeng
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland
| | - A Wallace Hayes
- Institute of Integrated Toxicology, Michigan State University, East Lansing, MI, USA
- College of Public Health, University of South Florida, Tampa, FL, USA
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44
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Farsalinos K. Electronic cigarettes: an aid in smoking cessation, or a new health hazard? Ther Adv Respir Dis 2018; 12:1753465817744960. [PMID: 29214890 PMCID: PMC5937152 DOI: 10.1177/1753465817744960] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 11/07/2017] [Indexed: 12/12/2022] Open
Abstract
The issue of electronic cigarettes is one of the most controversial topics in public health. There is intense debate and dividing opinions about their use patterns, health effects and association with smoking. This is expected since they were only recently introduced to the market and they refer to a harm-reduction approach and strategy that is not universally accepted for smoking and tobacco use in the public health community. Three main factors determine the public health impact of electronic cigarettes: (1) their safety/risk profile, both relative to smoking and in absolute terms; (2) their effectiveness for smoking reduction and cessation; (3) the patterns of use by different population subgroups, especially never-smokers, and adoption of use by youth. This analysis presents a brief overview of currently available evidence and gaps in research covering these three factors.
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Affiliation(s)
- Konstantinos Farsalinos
- Department of Cardiology, Onassis Cardiac
Surgery Center, Sygrou 356, Kallithea 17674, Greece Department of Pharmacy,
University of Patras, Rio-Patras 26500, Greece National School of Public
Health, Athens, Greece
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45
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Murphy J, Gaca M, Lowe F, Minet E, Breheny D, Prasad K, Camacho O, Fearon IM, Liu C, Wright C, McAdam K, Proctor C. Assessing modified risk tobacco and nicotine products: Description of the scientific framework and assessment of a closed modular electronic cigarette. Regul Toxicol Pharmacol 2017; 90:342-357. [PMID: 28954704 DOI: 10.1016/j.yrtph.2017.09.008] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2017] [Revised: 07/05/2017] [Accepted: 09/05/2017] [Indexed: 12/12/2022]
Abstract
Cigarette smoking causes many human diseases including cardiovascular disease, lung disease and cancer. Novel tobacco products with reduced yields of toxicants compared to cigarettes, such as tobacco-heating products, snus and electronic cigarettes, hold great potential for reducing the harms associated with tobacco use. In the UK several public health agencies have advocated a potential role for novel products in tobacco harm reduction. Public Health England has stated that "The current best estimate is that e-cigarettes are around 95% less harmful than smoking" and the Royal College of Physicians has urged public health to "Promote e-cigarettes widely as substitute for smoking". Health related claims on novel products such as 'reduced exposure' and 'reduced risk' should be substantiated using a weight of evidence approach based on a comprehensive scientific assessment. The US FDA, has provided draft guidance outlining a framework to assess novel products as Modified Risk Tobacco Products (MRTP). Based on this, we now propose a framework comprising pre-clinical, clinical, and population studies to assess the risk profile of novel tobacco products. Additionally, the utility of this framework is assessed through the pre-clinical and part of the clinical comparison of a commercial e-cigarette (Vype ePen) with a scientific reference cigarette (3R4F) and the results of these studies suggest that ePen has the potential to be a reduced risk product.
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Affiliation(s)
- James Murphy
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom.
| | - Marianna Gaca
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Frazer Lowe
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Emmanuel Minet
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Damien Breheny
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Krishna Prasad
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Oscar Camacho
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Ian M Fearon
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Chuan Liu
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Christopher Wright
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
| | - Kevin McAdam
- British American Tobacco, R&D Centre, Southampton, SO15 8TL, United Kingdom
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