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Kim MM, Steffensen I, Miguel RTD, Babic T, Johnson AD, Potts R, Junker CS. A systematic review of preclinical studies evaluating the association between nicotine and the initiation and progression of cancer. ANNALS OF TRANSLATIONAL MEDICINE 2023; 11:410. [PMID: 38213798 PMCID: PMC10777222 DOI: 10.21037/atm-23-1710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 10/11/2023] [Indexed: 01/13/2024]
Abstract
Background The association between cigarette smoking and the increased risk of many cancers is well established. Conversely, epidemiological studies of smokeless tobacco demonstrate decreased risk, or no elevated risk, of certain cancers versus smoking. However, it is unclear what role, if any, nicotine plays in these associations. The objective of this systematic review was to synthesize the available evidence from preclinical studies that examined the potential association between nicotine and the initiation and/or progression of cancer. Methods MEDLINE, Embase, PsychInfo, and Cochrane Database of Systematic Reviews were searched for articles published from inception until February 13, 2022. Studies were eligible for inclusion if they evaluated animal cancer or tumor models, compared nicotine and non-nicotine groups, and evaluated measures of cancer initiation or progression. Results Among 1,137 identified articles, 61 were included in qualitative synthesis. Twelve studies reported data on tumor initiation, and 54 studies reported data on tumor progression. The majority of the tumor initiation studies did not identify an association between nicotine exposure and an increased risk of spontaneous tumor initiation. Results of tumor progression studies were inconsistent and varied across the reported measures, cancer type being evaluated, and animal cancer model used. Overall, the quality of reporting was poor, with many studies not demonstrating a high level of internal and/or external validity. Conclusions In conclusion, although animal models have provided invaluable data for human health risk assessments of chemical exposures, the heterogeneity across the studies included in this systematic review make the interpretation and generalizability of the results difficult.
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Affiliation(s)
| | | | | | | | - Aubrey D. Johnson
- Scientific & Regulatory Affairs, RAI Services Company, Winston-Salem, NC, USA
| | - Ryan Potts
- Scientific & Regulatory Affairs, RAI Services Company, Winston-Salem, NC, USA
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Zhang X, Bradford B, Baweja S, Tan T, Lee HW, Jose CC, Kim N, Katari M, Cuddapah S. Nickel-induced transcriptional memory in lung epithelial cells promotes interferon signaling upon nicotine exposure. Toxicol Appl Pharmacol 2023; 481:116753. [PMID: 37951547 PMCID: PMC11065478 DOI: 10.1016/j.taap.2023.116753] [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: 09/12/2023] [Revised: 11/06/2023] [Accepted: 11/07/2023] [Indexed: 11/14/2023]
Abstract
Exposure to nickel, an environmental respiratory toxicant, is associated with lung diseases including asthma, pulmonary fibrosis, bronchitis and cancers. Our previous studies have shown that a majority of the nickel-induced transcriptional changes are persistent and do not reverse even after the termination of exposure. This suggested transcriptional memory, wherein the cell 'remembers' past nickel exposure. Transcriptional memory, due to which the cells respond more robustly to a previously encountered stimulus has been identified in a number of organisms. Therefore, transcriptional memory has been described as an adaptive mechanism. However, transcriptional memory caused by environmental toxicant exposures has not been well investigated. Moreover, how the transcriptional memory caused by an environmental toxicant might influence the outcome of exposure to a second toxicant has not been explored. In this study, we investigated whether nickel-induced transcriptional memory influences the outcome of the cell's response to a second respiratory toxicant, nicotine. Nicotine, an addictive compound in tobacco, is associated with the development of chronic lung diseases including chronic obstructive pulmonary disease (COPD) and pulmonary fibrosis. Our results show that nicotine exposure upregulated a subset of genes only in the cells previously exposed to nickel. Furthermore, our analyses indicate robust activation of interferon (IFN) signaling in these cells. IFN signaling is a driver of inflammation, which is associated with many chronic lung diseases. Therefore, our results suggest that nicotine exposure of lung cells that retain the transcriptional memory of previous nickel exposure could result in increased susceptibility to developing chronic inflammatory lung diseases.
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Affiliation(s)
- Xiaoru Zhang
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10010, USA
| | - Beatrix Bradford
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10010, USA
| | - Sahdev Baweja
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10010, USA; Center for Genomics and Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Taotao Tan
- Center for Genomics and Systems Biology, Department of Biology, New York University, New York, NY 10003, USA
| | - Hyun-Wook Lee
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10010, USA
| | - Cynthia C Jose
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10010, USA
| | - Nicholas Kim
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10010, USA
| | - Manpreet Katari
- Center for Genomics and Systems Biology, Department of Biology, New York University, New York, NY 10003, USA.
| | - Suresh Cuddapah
- Division of Environmental Medicine, Department of Medicine, New York University Grossman School of Medicine, New York, NY 10010, USA.
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Consumer experiences of long-term oral nicotine replacement therapy and related health information-seeking: A qualitative study. THE INTERNATIONAL JOURNAL OF DRUG POLICY 2022; 110:103897. [PMID: 36323188 DOI: 10.1016/j.drugpo.2022.103897] [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: 07/18/2022] [Revised: 09/20/2022] [Accepted: 10/19/2022] [Indexed: 11/06/2022]
Abstract
BACKGROUND Nicotine replacement therapy (NRT) delivers a therapeutic dose of nicotine to support smoking cessation, and is currently approved for short-term use (typically ≤12 weeks). Yet, research on real-world over-the-counter NRT use indicates that some consumers continue to use these products long-term. This study sought to understand consumers' experiences of long-term oral NRT use, including self-reported reasons for continued use, and health information-seeking regarding long-term use. METHODS In-depth semi-structured telephone interviews were conducted between May and June 2021 with 21 current and former NRT consumers aged ≥18 years from across Australia, with oral NRT use of ≥1 year. Interviews were thematically analysed using the Framework Method. RESULTS The majority of participants reported achieving NRT-assisted smoking cessation and related health benefits (e.g. respiratory health, improved physical appearance). However, nearly all participants reported experiencing addiction to oral NRT, with many attributing their long-term use to dependence on these products. Participants reported low engagement with NRT health information sources; just half reported consulting with a health professional regarding their long-term NRT use, and some reported negative experiences when health professional advice was sought (e.g. perceptions of not being taken seriously, perceived lack of health professional knowledge). Less than half of participants accurately identified the duration of use recommended in NRT consumer medicine information, and some reported actively dismissing this information. CONCLUSION Findings highlight consumers' perceived benefits of continued NRT use whilst also identifying two key concerns - the addictive potential of oral NRT, and low health information-seeking and health professional engagement regarding long-term use. While oral NRT is indisputably safer than tobacco smoking, public health strategies to raise consumer and health professional awareness about the safe use of NRT, which acknowledge the current evidence gap regarding safety and efficacy of long-term use, are needed to maximise their benefits as a harm reduction strategy for smoking cessation.
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Weiger C, Moran MB, Kennedy RD, Limaye R, Cohen J. Beliefs and Characteristics Associated With Believing Nicotine Causes Cancer: A Descriptive Analysis to Inform Corrective Message Content and Priority Audiences. Nicotine Tob Res 2022; 24:1264-1272. [PMID: 35385112 PMCID: PMC9278833 DOI: 10.1093/ntr/ntac060] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 01/27/2022] [Accepted: 03/02/2022] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Many cigarette smokers want to quit but have not. Switching to noncombustible products can reduce disease risk, but misperceptions that nicotine causes cancer might impact relative harm perceptions about noncombustible products and considering switching. Identifying which smokers are most likely to hold this misperception and associated beliefs can inform the content of and priority audiences for corrective messaging. METHODS Bivariable log binomial models were run on a sample of 9,013 adult established smokers from Wave 3 of the Population Assessment of Tobacco and Health. Post hoc testing identified groups and beliefs associated with significantly higher-than-average prevalence of the misperception. RESULTS About 61.2% of smokers believe nicotine causes cancer or don't know. Non-Hispanic Black (PR: 2.09) and Hispanic (PR: 1.73) smokers, as well as those making under $10,000 a year (PR: 1.36) had significantly higher-than-average prevalence of the misperception. Smokers who had recently used ENDS or smokeless tobacco had significantly lower-than-average prevalence of the misperception (PR: 0.70 and 0.63, respectively). Prevalence of nicotine misperceptions was significantly higher-than-average among those who recognized all ten smoking-caused diseases (PR: 1.34), believed additive-free cigarettes were more harmful than regular cigarettes (PR: 1.71), or did not report subjective norms supporting noncombustible use (PR: 1.05). CONCLUSION High perceived threat of tobacco may be overgeneralized to nicotine. High prevalence of the misperception among Non-Hispanic Black and low-income smokers is concerning, considering existing health disparities. Messaging should attempt to correct the misperception that nicotine causes cancer. Inferential reasoning after message exposure should assess accuracy of relative harm perceptions. IMPLICATIONS The current study supports the need for corrective messaging to address the misperception that nicotine causes cancer. Identifying that nicotine misperceptions are associated with higher harm perceptions about tobacco suggests that there may be unintended consequences of high perceived harm of tobacco that need to be addressed. As nicotine misperceptions are significantly more prevalent among those already at higher risk of tobacco caused diseases, care should be taken to ensure equity in message dissemination.
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Affiliation(s)
- Caitlin Weiger
- Department of Health, Behavior & Society, Johns Hopkins University Bloomberg School of Public Health, 624 North Broadway, Baltimore, MD 21205, USA
| | - Meghan Bridgid Moran
- Department of Health, Behavior & Society, Johns Hopkins University Bloomberg School of Public Health, 624 North Broadway, Baltimore, MD 21205, USA
| | - Ryan David Kennedy
- Department of Health, Behavior & Society, Johns Hopkins University Bloomberg School of Public Health, 624 North Broadway, Baltimore, MD 21205, USA
- Department of Health, Behavior and Society, Institute for Global Tobacco Control, Johns Hopkins University Bloomberg School of Public Health, 2213 McElderry St., 4th Floor, Baltimore, MD, USA
| | - Rupali Limaye
- Department of International Health, Johns Hopkins University Bloomberg School of Public Health, 615 N Wolfe St., Baltimore, MD 21205, USA
| | - Joanna Cohen
- Department of Health, Behavior & Society, Johns Hopkins University Bloomberg School of Public Health, 624 North Broadway, Baltimore, MD 21205, USA
- Department of Health, Behavior and Society, Institute for Global Tobacco Control, Johns Hopkins University Bloomberg School of Public Health, 2213 McElderry St., 4th Floor, Baltimore, MD, USA
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Garcia ALH, Matzenbacher CA, Soares S, Rohr P, da Silva J. Fluorosilicic acid and cotinine, separately and in combination, induce genotoxicity and telomeric reduction in human osteoblast cell line MG63. MUTATION RESEARCH. GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2022; 876-877:503474. [PMID: 35483789 DOI: 10.1016/j.mrgentox.2022.503474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 02/07/2022] [Accepted: 02/14/2022] [Indexed: 06/14/2023]
Abstract
Skeletal fluorosis is a severe case in which bone deformations and bone tissue weakening occur due to excessive fluorine deposition. Recently, data on smoking have been published that smoke constituents can indirectly influence bone mass and interfere in the metabolism of fluorides in humans. Thus, the present in vitro study aimed to assess the genetic instability in human osteoblast MG63 cells exposed to fluorosilicic acid (FA) and cotinine (COT), separately and in combination, in concentrations found in human plasma. For this, cell cytotoxicity was performed by MTT assay; DNA damage was performed by alkaline comet assay (CA), modified by repair endonucleases (+FPG); micronuclei test (MN) using CBMN-Cyt assay; and telomere length (TL) by qPCR in MG63 cells. No cytotoxicity was observed for all concentrations tested in this study. Alkaline CA results showed a significant increase in DNA damage at all FA concentrations (0.03125-0.300 mg/L), in the two highest concentrations of COT (125 and 250 ng/mL), and the highest concentration of FA+COT (0.300 mg/L+250 ng/mL). Alkaline CA+FPG test was used to detect oxidized nucleobases, which occurred at the two highest concentrations of FA, COT, and FA+COT. Micronuclei test showed an increase in the frequency of MN at all concentrations of FA (0.075-0.300 mg/L) except in the lowest concentration (0.03125 mg/L), in the two highest concentrations of COT (125 and 250 ng/mL), and all concentrations of FA+COT. There was no significant difference in nuclear division index, binucleated cells, nucleoplasmic bridge, and nuclear bud. A TL reduction was observed in cells treated with the highest concentrations of FA alone (0.300 mg/L) and FA+COT (0.300 mg/L+250 ng/mL). Finally, our study showed that FA and COT (mainly alone) at concentrations found in human plasma induced oxidative damage and genetic instability in human osteoblast cells.
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Affiliation(s)
- Ana L H Garcia
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology, PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health) and PPGGTA (Postgraduate Program in Genetics and Applied Toxicology), 92425-900, Canoas, RS, Brazil; Laboratory of Genetic Toxicology, La Salle University (UniLaSalle), Canoas, RS, Brazil.
| | - Cristina A Matzenbacher
- Federal University of Rio Grande do Sul, Department of Genetics, C.P. 15053, 91501-970 Porto Alegre, RS, Brazil
| | - Solange Soares
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology, PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health) and PPGGTA (Postgraduate Program in Genetics and Applied Toxicology), 92425-900, Canoas, RS, Brazil
| | - Paula Rohr
- Molecular Oncology Research Center, Barretos Cancer Hospital, Barretos, São Paulo, Brazil
| | - Juliana da Silva
- Lutheran University of Brazil (ULBRA), Laboratory of Genetic Toxicology, PPGBioSaúde (Postgraduate Program in Cellular and Molecular Biology Applied to Health) and PPGGTA (Postgraduate Program in Genetics and Applied Toxicology), 92425-900, Canoas, RS, Brazil; Laboratory of Genetic Toxicology, La Salle University (UniLaSalle), Canoas, RS, Brazil.
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Hecht SS, Hatsukami DK. Smokeless tobacco and cigarette smoking: chemical mechanisms and cancer prevention. Nat Rev Cancer 2022; 22:143-155. [PMID: 34980891 PMCID: PMC9308447 DOI: 10.1038/s41568-021-00423-4] [Citation(s) in RCA: 66] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 11/05/2021] [Indexed: 12/19/2022]
Abstract
Tobacco products present a deadly combination of nicotine addiction and carcinogen exposure resulting in millions of cancer deaths per year worldwide. A plethora of smokeless tobacco products lead to unacceptable exposure to multiple carcinogens, including the tobacco-specific nitrosamine N'-nitrosonornicotine, a likely cause of the commonly occurring oral cavity cancers observed particularly in South-East Asian countries. Cigarettes continue to deliver a large number of carcinogens, including tobacco-specific nitrosamines, polycyclic aromatic hydrocarbons and volatile organic compounds. The multiple carcinogens in cigarette smoke are responsible for the complex mutations observed in critical cancer genes. The exposure of smokeless tobacco users and smokers to carcinogens and toxicants can now be monitored by urinary and DNA adduct biomarkers that may be able to identify those individuals at highest risk of cancer so that effective cancer prevention interventions can be initiated. Regulation of the levels of carcinogens, toxicants and nicotine in tobacco products and evidence-based tobacco control efforts are now recognized as established pathways to preventing tobacco related cancer.
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Affiliation(s)
- Stephen S Hecht
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA.
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Tang MS, Lee HW, Weng MW, Wang HT, Hu Y, Chen LC, Park SH, Chan HW, Xu J, Wu XR, Wang H, Yang R, Galdane K, Jackson K, Chu A, Halzack E. DNA damage, DNA repair and carcinogenicity: Tobacco smoke versus electronic cigarette aerosol. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2022; 789:108409. [PMID: 35690412 PMCID: PMC9208310 DOI: 10.1016/j.mrrev.2021.108409] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 12/06/2021] [Accepted: 12/13/2021] [Indexed: 01/03/2023]
Abstract
The allure of tobacco smoking is linked to the instant gratification provided by inhaled nicotine. Unfortunately, tobacco curing and burning generates many mutagens including more than 70 carcinogens. There are two types of mutagens and carcinogens in tobacco smoke (TS): direct DNA damaging carcinogens and procarcinogens, which require metabolic activation to become DNA damaging. Recent studies provide three new insights on TS-induced DNA damage. First, two major types of TS DNA damage are induced by direct carcinogen aldehydes, cyclic-1,N2-hydroxy-deoxyguanosine (γ-OH-PdG) and α-methyl-1, N2-γ-OH-PdG, rather than by the procarcinogens, polycyclic aromatic hydrocarbons and aromatic amines. Second, TS reduces DNA repair proteins and activity levels. TS aldehydes also prevent procarcinogen activation. Based on these findings, we propose that aldehydes are major sources of TS induce DNA damage and a driving force for carcinogenesis. E-cigarettes (E-cigs) are designed to deliver nicotine in an aerosol state, without burning tobacco. E-cigarette aerosols (ECAs) contain nicotine, propylene glycol and vegetable glycerin. ECAs induce O6-methyl-deoxyguanosines (O6-medG) and cyclic γ-hydroxy-1,N2--propano-dG (γ-OH-PdG) in mouse lung, heart and bladder tissues and causes a reduction of DNA repair proteins and activity in lungs. Nicotine and nicotine-derived nitrosamine ketone (NNK) induce the same types of DNA adducts and cause DNA repair inhibition in human cells. After long-term exposure, ECAs induce lung adenocarcinoma and bladder urothelial hyperplasia in mice. We propose that E-cig nicotine can be nitrosated in mouse and human cells becoming nitrosamines, thereby causing two carcinogenic effects, induction of DNA damage and inhibition of DNA repair, and that ECA is carcinogenic in mice. Thus, this article reviews the newest literature on DNA adducts and DNA repair inhibition induced by nicotine and ECAs in mice and cultured human cells, and provides insights into ECA carcinogenicity in mice.
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Affiliation(s)
- Moon-Shong Tang
- Department of Environmental Medicine, Pathology and Medicine, United States.
| | - Hyun-Wook Lee
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Mao-Wen Weng
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Hsiang-Tsui Wang
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Yu Hu
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Lung-Chi Chen
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Sung-Hyun Park
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Huei-Wei Chan
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Jiheng Xu
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Xue-Ru Wu
- Departmemt of Urology, New York University School of Medicine, New York, NY10016, United States
| | - He Wang
- Department of Pathology and Laboratory Medicine, Robert Wood Johnson MedicalSchool, Rutgers University, Piscataway, NJ 08854, United States
| | - Rui Yang
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Karen Galdane
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Kathryn Jackson
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Annie Chu
- Department of Environmental Medicine, Pathology and Medicine, United States
| | - Elizabeth Halzack
- Department of Environmental Medicine, Pathology and Medicine, United States
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McCracken BA, VanPutte CL, Hildebolt CF. Nicotine-related misperceptions among faculty and students at a Midwestern dental school. J Dent Educ 2021; 86:161-168. [PMID: 34542179 DOI: 10.1002/jdd.12788] [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: 06/28/2021] [Revised: 08/10/2021] [Accepted: 09/03/2021] [Indexed: 11/06/2022]
Abstract
PURPOSE/OBJECTIVES To determine the perceptions about the ill-effects of nicotine in students and faculty at a Midwestern dental school. This information will help inform the school and improve teaching on this subject during a time when electronic nicotine delivery systems are increasingly popular. METHODS An online survey of dental students and faculty of a Midwestern dental school was deployed in November, 2020 to determine their level of misperception about the ill effects of nicotine. An online Qualtrics survey was administered to approximately 212 predoctoral students at a dental institution and approximately 100 part- and full-time faculty at the same school. RESULTS The response rate for faculty was 55.1% and that for students was 37.5%. The majority of faculty and students "agreed" or "strongly agreed" that nicotine causes cancer, birth defects, cardiovascular disease, oral inflammation, and Chronic Obstructive Pulmonary Disease. CONCLUSIONS Dental school faculty and students linked the risks of smoking tobacco to nicotine. Based on the results of this study, we feel our institution's curriculum should consider including information specific to nicotine in addition to tobacco in general.
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Affiliation(s)
- Barbara A McCracken
- Department of Growth, Development, and Structure, Southern Illinois University School of Dental Medicine, Alton, Illinois, USA
| | - Cinnamon L VanPutte
- Department of Growth, Development, and Structure, Southern Illinois University School of Dental Medicine, Alton, Illinois, USA
| | - Charles F Hildebolt
- Department of Applied Dental Medicine, Southern Illinois University School of Dental Medicine, Alton, Illinois, USA
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Qamar W, Altamimi MA, Rehman MU, Ali N, Imam F, Alanazi FE. Toxicological interaction between tobacco smoke toxicants cadmium and nicotine: An in-vitro investigation. Saudi J Biol Sci 2021; 28:4201-4209. [PMID: 34354400 PMCID: PMC8324994 DOI: 10.1016/j.sjbs.2021.05.015] [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: 04/04/2021] [Revised: 04/27/2021] [Accepted: 05/04/2021] [Indexed: 11/16/2022] Open
Abstract
Cigarettes and other tobacco products are used to obtain nicotine that is responsible for their stimulating effects. However, a lot of other organic and inorganic chemicals are also released along with nicotine. Cadmium (Cd) is one of the several heavy metals that are health hazards and is one of the inorganic elements released in tobacco smoke. The in-vitro investigation focused on exploring the effects of nicotine hydrogen tartrate (NHT) and cadmium (Cd) and their toxic interactions in the A549 cell line. In cell viability assay NHT exhibited its IC50 at 11.71 mM concentration, and the IC50 of Cd was found to be 83 µM after a 24 h exposure. Toxic effects of NHT (5 mM and 10 mM), Cd (50 µM and 100 µM), and their combination were also investigated by flowcytometry. The investigation included apoptotic and necrotic events, the effect on different cell cycle phases, and generation of reactive oxygen species by NHT, Cd, and their combination of different concentrations. Data reveal evident toxic effects of NHT, Cd, and NHT + Cd. It also indicates that the toxic interaction of NHT and Cd is not additive and appears to be minimal when compared with NHT or Cd exposures alone.
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Affiliation(s)
- Wajhul Qamar
- Department of Pharmacology and Toxicology, and Central Laboratory, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mohammad A. Altamimi
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Muneeb U. Rehman
- Department of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Nemat Ali
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Faisal Imam
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Fawaz Essa Alanazi
- Department of Pharmacology and Toxicology, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
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Halder N, Lal G. Cholinergic System and Its Therapeutic Importance in Inflammation and Autoimmunity. Front Immunol 2021; 12:660342. [PMID: 33936095 PMCID: PMC8082108 DOI: 10.3389/fimmu.2021.660342] [Citation(s) in RCA: 69] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 03/26/2021] [Indexed: 12/11/2022] Open
Abstract
Neurological and immunological signals constitute an extensive regulatory network in our body that maintains physiology and homeostasis. The cholinergic system plays a significant role in neuroimmune communication, transmitting information regarding the peripheral immune status to the central nervous system (CNS) and vice versa. The cholinergic system includes the neurotransmitter\ molecule, acetylcholine (ACh), cholinergic receptors (AChRs), choline acetyltransferase (ChAT) enzyme, and acetylcholinesterase (AChE) enzyme. These molecules are involved in regulating immune response and playing a crucial role in maintaining homeostasis. Most innate and adaptive immune cells respond to neuronal inputs by releasing or expressing these molecules on their surfaces. Dysregulation of this neuroimmune communication may lead to several inflammatory and autoimmune diseases. Several agonists, antagonists, and inhibitors have been developed to target the cholinergic system to control inflammation in different tissues. This review discusses how various molecules of the neuronal and non-neuronal cholinergic system (NNCS) interact with the immune cells. What are the agonists and antagonists that alter the cholinergic system, and how are these molecules modulate inflammation and immunity. Understanding the various functions of pharmacological molecules could help in designing better strategies to control inflammation and autoimmunity.
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Affiliation(s)
- Namrita Halder
- Laboratory of Autoimmunity and Tolerance, National Centre for Cell Science, Ganeshkhind, Pune, India
| | - Girdhari Lal
- Laboratory of Autoimmunity and Tolerance, National Centre for Cell Science, Ganeshkhind, Pune, India
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Bush A, Lintowska A, Mazur A, Hadjipanayis A, Grossman Z, Del Torso S, Michaud PA, Doan S, Romankevych I, Slaats M, Utkus A, Dembiński Ł, Slobodanac M, Valiulis A. E-Cigarettes as a Growing Threat for Children and Adolescents: Position Statement From the European Academy of Paediatrics. Front Pediatr 2021; 9:698613. [PMID: 34737999 PMCID: PMC8562300 DOI: 10.3389/fped.2021.698613] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 09/08/2021] [Indexed: 12/02/2022] Open
Abstract
As the tobacco epidemic has waned, it has been followed by the advent of electronic nicotine delivery devices (ENDS) primarily manufactured by the tobacco industry to try to recruit replacements for deceased tobacco addicts. This document sets out the ten recommendations of the European Academy of Paediatrics (EAP) with regard to e-cigarettes and children and young people (CYP). The EAP notes that nicotine is itself a drug of addiction, with toxicity to the foetus, child and adult, and were ENDS only to contain nicotine, their use to create a new generation of addicts would be rigorously opposed. However, e-cigarettes include numerous unregulated chemicals, including known carcinogens, whose acute and long term toxicities are unknown. The EAP asserts that there is incontrovertible evidence that the acute toxicity of e-cigarettes is greater than that of "traditional" tobacco smoking, and a variety of acute pulmonary toxicities, including acute lung injuries, have been recorded due to e-cigarettes usage. The chronic toxicity of e-cigarettes is unknown, but given the greater acute toxicity compared to tobacco, the EAP cannot assume that e-cigarettes are safer in the long term. The high uptake of e-cigarettes by CYP, including under-age children, is partly fuelled by deceitful marketing and internet exposure, which is also unregulated. Although proposed as aids to smoking cessation, there is no evidence that e-cigarettes add anything to standard smoking cessation strategies. In summary, the EAP regards these devices and liquids as very dangerous, and ineluctably opposed to their use, and their direct or indirect marketing.
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Affiliation(s)
- Andrew Bush
- Imperial College Centre for Paediatrics and Child Health, National Heart and Lung Institute, Royal Brompton Harefield NHS Foundation Trust, London, United Kingdom
| | - Agnieszka Lintowska
- Department of Health Promotion, Faculty of Health Science, Wroclaw Medical University, Wroclaw, Poland
| | - Artur Mazur
- Institute of Medical Sciences, Medical College, University of Rzeszów, Rzeszow, Poland.,European Academy of Paediatric (EAP/UEMS-SP), Brussels, Belgium
| | - Adamos Hadjipanayis
- European Academy of Paediatric (EAP/UEMS-SP), Brussels, Belgium.,Medical School, European University of Cyprus, Nicosia, Cyprus
| | - Zacchi Grossman
- European Academy of Paediatric (EAP/UEMS-SP), Brussels, Belgium.,Adelson School of Medicine, Ariel University, Ariel, Israel.,Maccabi Health Services, Tel Aviv, Israel
| | - Stefano Del Torso
- European Academy of Paediatric (EAP/UEMS-SP), Brussels, Belgium.,Pediatra di Famiglia ULSS 16, Padua, Italy
| | - Pierre-André Michaud
- Faculté de Biologie et de Médecine, Université de Lausanne, Lausanne, Switzerland
| | - Svitlana Doan
- Department of Public Health and Microbiology, Kyiv Medical University, Kyiv, Ukraine
| | - Ivanna Romankevych
- Shupyk National Medical Academy of Postgraduate Education, Kyiv, Ukraine
| | - Monique Slaats
- European Academy of Paediatric (EAP/UEMS-SP), Brussels, Belgium.,Pediatric Pulmonology, Sophia Children's Hospital, Rotterdam, Netherlands
| | - Algirdas Utkus
- Department of Human and Medical Genetics, Institute of Biomedical Sciences, Vilnius University Medical Faculty, Vilnius, Lithuania
| | - Łukasz Dembiński
- European Academy of Paediatric (EAP/UEMS-SP), Brussels, Belgium.,Department of Pediatric Gastroenterology and Nutrition, Medical University of Warsaw, Warsaw, Poland
| | | | - Arunas Valiulis
- European Academy of Paediatric (EAP/UEMS-SP), Brussels, Belgium.,Clinic of Children's Diseases, Institute of Clinical Medicine, and Department of Public Health, Institute of Health Sciences, Vilnius University Medical Faculty, Vilnius, Lithuania
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12
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Alves J, Da Silva FR, Kahl V, Reyes J, Lima E, Abreu MB, Thiesen FV, Dos Santos DL, Salvador M, Dos Santos Branco C, Nersesyan A, Knasmuller S, Da Silva J. Impact of nicotine-induced green tobacco sickness on DNA damage and the relation with symptoms and alterations of redox status in tobacco farmers. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 206:111397. [PMID: 33007538 DOI: 10.1016/j.ecoenv.2020.111397] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 09/11/2020] [Accepted: 09/21/2020] [Indexed: 06/11/2023]
Abstract
During the harvest period, tobacco workers are exposed to nicotine and it is known that absorption of the alkaloid via the leaves causes green tobacco sickness (GST). We investigated if GST and its symptoms are associated with DNA damage and alterations of the redox status. DNA damage was measured in lymphocytes of tobacco workers and controls (n = 40/group) in single cell gel electrophoresis assays. Exposure to nicotine was determined by plasma cotinine measurements, alterations of the redox status by quantification of the total antioxidant capacity (TEAC) and of thiobarbituric acid reactive substances (TBARS). The symptoms of GTS included nausea, abdominal cramps, headache, vomiting and dizziness, and 50% of the workers had more than one symptom. Cotinine levels were enhanced in the workers (111 ng/mL); furthermore, the extent of DNA damage was ca. 3-fold higher than in the controls. This effect was more pronounced in participants with GST compared to healthy nicotine exposed workers and increased in individuals with specific symptoms (range 22-36%). TBARS levels did not differ between workers and unexposed controls, while TEAC values were even increased (by 14.3%). Contact with nicotine present in tobacco leaves causes GTS and leads to damage of the DNA; this effect is more pronounced in workers with GTS symptoms and is associated with alterations of the redox status. Damage of the genetic material which was found in the workers may lead to adverse long-term effects that are caused by genomic instability such as cancer and accelerated ageing.
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Affiliation(s)
- Jodel Alves
- Laboratory of Genetic Toxicology, PPGBioSaúde, Lutheran University of Brazil (ULBRA), Canoas, RS, Brazil
| | - Fernanda R Da Silva
- Posgraduate Program in Evaluation of Environmental Impacts, La Salle University (UniLaSalle), Canoas, RS, Brazil
| | - Vivian Kahl
- Telomere Length Regulation Unit, Children's Medical Research Institute (CMRI), Sydney, NSW, Australia
| | - Juliana Reyes
- Laboratory of Genetic Toxicology, PPGBioSaúde, Lutheran University of Brazil (ULBRA), Canoas, RS, Brazil
| | - Elisiane Lima
- Laboratory of Genetic Toxicology, PPGBioSaúde, Lutheran University of Brazil (ULBRA), Canoas, RS, Brazil
| | - Marina B Abreu
- Toxicology Institute, Catholic Pontificie University of Rio Grande do Sul (PUC), Porto Alegre, RS, Brazil
| | - Flávia V Thiesen
- Toxicology Institute, Catholic Pontificie University of Rio Grande do Sul (PUC), Porto Alegre, RS, Brazil
| | - Denise Leal Dos Santos
- Toxicology Institute, Catholic Pontificie University of Rio Grande do Sul (PUC), Porto Alegre, RS, Brazil
| | - Mirian Salvador
- Biotechnology Institute, University of Caxias do Sul, Caxias do Sul (UCS), RS, Brazil; Mestrado em Avaliação de Impactos Ambientais, Canoas, RS, Brazil
| | - Cátia Dos Santos Branco
- Biotechnology Institute, University of Caxias do Sul, Caxias do Sul (UCS), RS, Brazil; Mestrado em Avaliação de Impactos Ambientais, Canoas, RS, Brazil
| | - Armen Nersesyan
- Institute of Cancer Research, Department of Internal Medicine I, Medical University of Vienna, Vienna, Austria
| | - Siegfried Knasmuller
- Institute of Cancer Research, Department of Internal Medicine I, Medical University of Vienna, Vienna, Austria
| | - Juliana Da Silva
- Laboratory of Genetic Toxicology, PPGBioSaúde, Lutheran University of Brazil (ULBRA), Canoas, RS, Brazil; Posgraduate Program in Health and Human Development, La Salle University (UniLaSalle), Canoas, RS, Brazil.
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13
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Szukalska M, Szyfter K, Florek E, Rodrigo JP, Rinaldo A, Mäkitie AA, Strojan P, Takes RP, Suárez C, Saba NF, Braakhuis BJ, Ferlito A. Electronic Cigarettes and Head and Neck Cancer Risk-Current State of Art. Cancers (Basel) 2020; 12:E3274. [PMID: 33167393 PMCID: PMC7694366 DOI: 10.3390/cancers12113274] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 11/03/2020] [Indexed: 01/11/2023] Open
Abstract
E-cigarettes have become increasingly popular in the last decade and are considered less harmful than traditional tobacco products due to the lower content of toxic and carcinogenic compounds. However, this is still a controversial issue. This paper contains a review of previous reports on the composition of e-cigarettes and their impact on the pathogenesis and risk of head and neck cancer (HNC). The objective of the review was to compare the molecular and health effects of e-cigarette use in relation to the effects of traditional cigarette smoking in the upper respiratory tract, and to assess the safety and effect of e-cigarettes on HNC risk. A review for English language articles published until 31 August 2020 was made, using a PubMed (including MEDLINE), CINAHL Plus, Embase, Cochrane Library and Web of Science data. The authors reviewed articles on both toxic and carcinogenic compounds contained in e-cigarettes and their molecular and health effects on the upper respiratory tract in comparison to tobacco cigarettes. The risk of developing head and neck squamous cell carcinoma (HNSCC) remains lower in users of e-cigarettes compared with tobacco smokers. However, more long-term studies are needed to better address the safety of e-cigarettes.
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Affiliation(s)
- Marta Szukalska
- Laboratory of Environmental Research, Department of Toxicology, Poznan University of Medical Sciences, 60-631 Poznan, Poland
| | - Krzysztof Szyfter
- Institute of Human Genetics, Polish Academy of Sciences, 60-479 Poznan, Poland;
| | - Ewa Florek
- Laboratory of Environmental Research, Department of Toxicology, Poznan University of Medical Sciences, 60-631 Poznan, Poland
| | - Juan P. Rodrigo
- Department of Otolaryngology, Hospital Universitario Central de Asturias-University of Oviedo, 33011 Oviedo, Spain;
- Instituto de Investigación Sanitaria del Principado de Asturias, Instituto Universitario de Oncología del Principado de Asturias, University of Oviedo, CIBERONC, 33011 Oviedo, Spain;
| | | | - Antti A. Mäkitie
- Department of Otorhinolaryngology, Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, 00029 HUS Helsinki, Finland;
- Research Program in Systems Oncology, Faculty of Medicine, University of Helsinki, 00014 Helsinki, Finland
- Division of Ear, Nose and Throat Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institute and Karolinska Hospital, 141 86 Stockholm, Sweden
| | - Primož Strojan
- Department of Radiation Oncology, Institute of Oncology, 1000 Ljubljana, Slovenia;
| | - Robert P. Takes
- Department of Otolaryngology-Head and Neck Surgery, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands;
| | - Carlos Suárez
- Instituto de Investigación Sanitaria del Principado de Asturias, Instituto Universitario de Oncología del Principado de Asturias, University of Oviedo, CIBERONC, 33011 Oviedo, Spain;
| | - Nabil F. Saba
- Department of Hematology and Medical Oncology, Emory University, Atlanta, GA 30322, USA;
| | | | - Alfio Ferlito
- Coordinator of the International Head and Neck Scientific Group, 35100 Padua, Italy;
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14
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Jamshed L, Perono GA, Jamshed S, Holloway AC. Early Life Exposure to Nicotine: Postnatal Metabolic, Neurobehavioral and Respiratory Outcomes and the Development of Childhood Cancers. Toxicol Sci 2020; 178:3-15. [PMID: 32766841 PMCID: PMC7850035 DOI: 10.1093/toxsci/kfaa127] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Cigarette smoking during pregnancy is associated with numerous obstetrical, fetal, and developmental complications, as well as an increased risk of adverse health consequences in the adult offspring. Nicotine replacement therapy and electronic nicotine delivery systems (e-cigarettes) have been developed as a pharmacotherapy for smoking cessation and are considered safer alternatives for women to smoke during pregnancy. The safety of nicotine replacement therapy use during pregnancy has been evaluated in a limited number of short-term human trials, but there is currently no information on the long-term effects of developmental nicotine exposure in humans. However, animal studies suggest that nicotine alone may be a key chemical responsible for many of the long-term effects associated with maternal cigarette smoking on the offspring and increases the risk of adverse neurobehavioral outcomes, dysmetabolism, respiratory illness, and cancer. This review will examine the long-term effects of fetal and neonatal nicotine exposure on postnatal health.
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Affiliation(s)
- Laiba Jamshed
- Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario L8N 3Z5, Canada
| | - Genevieve A Perono
- Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario L8N 3Z5, Canada
| | - Shanza Jamshed
- Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario L8N 3Z5, Canada
| | - Alison C Holloway
- Department of Obstetrics and Gynecology, McMaster University, Hamilton, Ontario L8N 3Z5, Canada
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15
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Rodrigo G, Jaccard G, Tafin Djoko D, Korneliou A, Esposito M, Belushkin M. Cancer potencies and margin of exposure used for comparative risk assessment of heated tobacco products and electronic cigarettes aerosols with cigarette smoke. Arch Toxicol 2020; 95:283-298. [PMID: 33025067 PMCID: PMC7811518 DOI: 10.1007/s00204-020-02924-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 09/29/2020] [Indexed: 12/31/2022]
Abstract
Health risk associated with the use of combustible cigarettes is well characterized and numerous epidemiological studies have been published for many years. Since more than a decade, innovative non-combusted tobacco products have emerged like heated tobacco products (HTP) or electronic cigarettes (EC). Long-term effects of these new products on health remain, however, unknown and there is a need to characterize associated potential health risks. The time dedicated to epidemiological data generation (at least 20 to 40 years for cancer endpoint), though, is not compatible with innovative development. Surrogates need, therefore, to be developed. In this work, non-cancer and cancer risks were estimated in a range of HTP and commercial combustible cigarettes based upon their harmful and potentially harmful constituent yields in aerosols and smoke, respectively. It appears that mean lifetime cancer risk values were decreased by more than one order of magnitude when comparing HTPs and commercial cigarettes, and significantly higher margin of exposure for non-cancer risk was observed for HTPs when compared to commercial cigarettes. The same approach was applied to two commercial ECs. Similar results were also found for this category of products. Despite uncertainties related to the factors used for the calculations and methodological limitations, this approach is valuable to estimate health risks associated to the use of innovative products. Moreover, it acts as predictive tool in absence of long-term epidemiological data. Furthermore, both cancer and non-cancer risks estimated for HTPs and ECs highlight the potential of reduced risk for non-combusted products when compared to cigarette smoking.
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Affiliation(s)
- Gregory Rodrigo
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000, Neuchâtel, Switzerland
| | - Guy Jaccard
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000, Neuchâtel, Switzerland.
| | - Donatien Tafin Djoko
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000, Neuchâtel, Switzerland
| | - Alexandra Korneliou
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000, Neuchâtel, Switzerland
| | - Marco Esposito
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000, Neuchâtel, Switzerland
| | - Maxim Belushkin
- PMI R&D, Philip Morris Products S.A., Rue des Usines 56, 2000, Neuchâtel, Switzerland
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16
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Dalberto D, Nicolau CC, Garcia ALH, Nordin AP, Grivicich I, Silva JD. Cytotoxic and genotoxic evaluation of cotinine using human neuroblastoma cells (SH-SY5Y). Genet Mol Biol 2020; 43:e20190123. [PMID: 32478795 PMCID: PMC7271658 DOI: 10.1590/1678-4685-gmb-2019-0123] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Accepted: 07/11/2019] [Indexed: 02/06/2023] Open
Abstract
Cotinine is the main metabolite of nicotine, which is metabolized in the liver
through a cytochrome P450 enzyme. Different studies point to genetic instability
caused by nicotine, such as single and double DNA strand breaks and micronuclei
formation, but little is known about the effect of cotinine. Therefore, the
present in vitro study assessed the effects of cotinine on cell
viability and DNA damage in SH-SY5Y neuroblastoma cells, as well as genotoxicity
related to oxidative stress mechanisms. Comparisons with nicotine were also
performed. An alkaline comet assay modified by repair endonucleases (FPG, OGG1,
and Endo III) was used to detect oxidized nucleobases. SH-SY5Y neuronal cells
were cultured under standard conditions and exposed for 3 h to different
concentrations of cotinine and nicotine. Cytotoxicity was observed at higher
doses of cotinine and nicotine in the MTT assay. In the trypan blue assay, cells
showed viability above 80% for both compounds. Alkaline comet assay results
demonstrated a significant increase in damage index and frequency for cells
treated with cotinine and nicotine, presenting genotoxicity. The results of the
enzyme-modified comet assay suggest a DNA oxidative damage induced by nicotine.
Unlike other studies, our results demonstrated genotoxicity induced by both
cotinine and nicotine. The similar effects observed for these two pyridine
alkaloids may be due to the similarity of their structures.
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Affiliation(s)
- Daiana Dalberto
- Universidade Luterana do Brasil (ULBRA), Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada à Saúde - PPGBioSaúde, Laboratório de Toxicologia Genética, Canoas, RS, Brazil
| | - Caroline Cardoso Nicolau
- Universidade Luterana do Brasil (ULBRA), Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada à Saúde - PPGBioSaúde, Laboratório de Toxicologia Genética, Canoas, RS, Brazil
| | - Ana Leticia Hilario Garcia
- Universidade Luterana do Brasil (ULBRA), Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada à Saúde - PPGBioSaúde, Laboratório de Toxicologia Genética, Canoas, RS, Brazil.,Universidade Feevale, Programa de Pós-Graduação em Qualidade Ambiental, Laboratório de Ecotoxicologia, Novo Hamburgo, RS, Brazil
| | - Adriane Perachi Nordin
- Universidade Luterana do Brasil (ULBRA), Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada à Saúde - PPGBioSaúde, Laboratório de Toxicologia Genética, Canoas, RS, Brazil
| | - Ivana Grivicich
- Universidade Luterana do Brasil (ULBRA), Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada à Saúde - PPGBioSaúde, , Laboratório de Biologia de Cancer, Canoas, RS, Brazil
| | - Juliana da Silva
- Universidade Luterana do Brasil (ULBRA), Programa de Pós-Graduação em Biologia Celular e Molecular Aplicada à Saúde - PPGBioSaúde, Laboratório de Toxicologia Genética, Canoas, RS, Brazil.,Universidade La Salle, Programa de Pós-Graduação em Saúde e Desenvolvimento Humano, Canoas, RS, Brazil
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17
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Tang MS, Wu XR, Lee HW, Xia Y, Deng FM, Moreira AL, Chen LC, Huang WC, Lepor H. Electronic-cigarette smoke induces lung adenocarcinoma and bladder urothelial hyperplasia in mice. Proc Natl Acad Sci U S A 2019; 116:21727-21731. [PMID: 31591243 PMCID: PMC6815158 DOI: 10.1073/pnas.1911321116] [Citation(s) in RCA: 118] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Electronic-cigarettes (E-cigs) are marketed as a safe alternative to tobacco to deliver the stimulant nicotine, and their use is gaining in popularity, particularly among the younger population. We recently showed that mice exposed to short-term (12 wk) E-cig smoke (ECS) sustained extensive DNA damage in lungs, heart, and bladder mucosa and diminished DNA repair in lungs. Nicotine and its nitrosation product, nicotine-derived nitrosamine ketone, cause the same deleterious effects in human lung epithelial and bladder urothelial cells. These findings raise the possibility that ECS is a lung and bladder carcinogen in addition to nicotine. Given the fact that E-cig use has become popular in the past decade, epidemiological data on the relationship between ECS and human cancer may not be known for a decade to come. In this study, the carcinogenicity of ECS was tested in mice. We found that mice exposed to ECS for 54 wk developed lung adenocarcinomas (9 of 40 mice, 22.5%) and bladder urothelial hyperplasia (23 of 40 mice, 57.5%). These lesions were extremely rare in mice exposed to vehicle control or filtered air. Current observations that ECS induces lung adenocarcinomas and bladder urothelial hyperplasia, combined with our previous findings that ECS induces DNA damage in the lungs and bladder and inhibits DNA repair in lung tissues, implicate ECS as a lung and potential bladder carcinogen in mice. While it is well established that tobacco smoke poses a huge threat to human health, whether ECS poses any threat to humans is not yet known and warrants careful investigation.
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Affiliation(s)
- Moon-Shong Tang
- Department of Environmental Medicine, New York University School of Medicine, New York, NY 10010;
- Department of Medicine, New York University School of Medicine, New York, NY 10010
- Department of Pathology, New York University School of Medicine, New York, NY 10010
| | - Xue-Ru Wu
- Department of Pathology, New York University School of Medicine, New York, NY 10010
- Department of Urology, New York University School of Medicine, New York, NY 10010
| | - Hyun-Wook Lee
- Department of Environmental Medicine, New York University School of Medicine, New York, NY 10010
| | - Yong Xia
- Department of Urology, New York University School of Medicine, New York, NY 10010
| | - Fang-Ming Deng
- Department of Pathology, New York University School of Medicine, New York, NY 10010
| | - Andre L Moreira
- Department of Pathology, New York University School of Medicine, New York, NY 10010
| | - Lung-Chi Chen
- Department of Environmental Medicine, New York University School of Medicine, New York, NY 10010
| | - William C Huang
- Department of Urology, New York University School of Medicine, New York, NY 10010
| | - Herbert Lepor
- Department of Urology, New York University School of Medicine, New York, NY 10010
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18
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Price LR, Martinez J. Biological effects of nicotine exposure: A narrative review of the scientific literature. F1000Res 2019; 8:1586. [PMID: 32595938 PMCID: PMC7308884 DOI: 10.12688/f1000research.20062.1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/20/2019] [Indexed: 09/07/2023] Open
Abstract
The emergence of new tobacco heating products and electronic nicotine delivery systems (ENDS) is changing the way humans are exposed to nicotine. The purpose of this narrative review is to provide a broad overview of published scientific literature with respect to the effects of nicotine on three key health-related areas: 1) cardiovascular risk, 2) carcinogenesis and 3) reproductive outcomes. These areas are known to be particularly vulnerable to the effects of cigarette smoke, and in addition, nicotine has been hypothesized to play a role in disease pathogenesis. Acute toxicity will also be discussed. The literature to February 2019 suggests that there is no increased cardiovascular risk of nicotine exposure in consumers who have no underlying cardiovascular pathology. There is scientific consensus that nicotine is not a direct or complete carcinogen, however, it remains to be established whether it plays some role in human cancer propagation and metastasis. These cancer progression pathways have been proposed in models in vitro and in transgenic rodent lines in vivo but have not been demonstrated in cases of human cancer. Further studies are needed to determine whether nicotine is linked to decreased fertility in humans. The results from animal studies indicate that nicotine has the potential to act across many mechanisms during fetal development. More studies are needed to address questions regarding nicotine exposure in humans, and this may lead to additional guidance concerning new ENDS entering the market.
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Affiliation(s)
- Leonie R. Price
- Scientific and Regulatory Affairs, Japan Tobacco International, Genève, Genève, 1202, Switzerland
| | - Javier Martinez
- Scientific and Regulatory Affairs, Japan Tobacco International, Genève, Genève, 1202, Switzerland
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19
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Price LR, Martinez J. Cardiovascular, carcinogenic and reproductive effects of nicotine exposure: A narrative review of the scientific literature. F1000Res 2019; 8:1586. [PMID: 32595938 PMCID: PMC7308884 DOI: 10.12688/f1000research.20062.2] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 12/20/2019] [Indexed: 12/14/2022] Open
Abstract
The emergence of new tobacco heating products and electronic nicotine delivery systems (ENDS) is changing the way humans are exposed to nicotine. The purpose of this narrative review is to provide a broad overview of published scientific literature with respect to the effects of nicotine on three key health-related areas: 1) cardiovascular risk, 2) carcinogenesis and 3) reproductive outcomes. These areas are known to be particularly vulnerable to the effects of cigarette smoke, and in addition, nicotine has been hypothesized to play a role in disease pathogenesis. Acute toxicity will also be discussed. The literature to February 2019 suggests that there is no increased cardiovascular risk of nicotine exposure in consumers who have no underlying cardiovascular pathology. There is scientific consensus that nicotine is not a direct or complete carcinogen, however, it remains to be established whether it plays some role in human cancer propagation and metastasis. These cancer progression pathways have been proposed in models in vitro and in transgenic rodent lines in vivo but have not been demonstrated in cases of human cancer. Further studies are needed to determine whether nicotine is linked to decreased fertility in humans. The results from animal studies indicate that nicotine has the potential to act across many mechanisms during fetal development. More studies are needed to address questions regarding nicotine exposure in humans, and this may lead to additional guidance concerning new ENDS entering the market.
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Affiliation(s)
- Leonie R. Price
- Scientific and Regulatory Affairs, Japan Tobacco International, Genève, Genève, 1202, Switzerland
| | - Javier Martinez
- Scientific and Regulatory Affairs, Japan Tobacco International, Genève, Genève, 1202, Switzerland
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20
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Malińska D, Więckowski MR, Michalska B, Drabik K, Prill M, Patalas-Krawczyk P, Walczak J, Szymański J, Mathis C, Van der Toorn M, Luettich K, Hoeng J, Peitsch MC, Duszyński J, Szczepanowska J. Mitochondria as a possible target for nicotine action. J Bioenerg Biomembr 2019; 51:259-276. [PMID: 31197632 PMCID: PMC6679833 DOI: 10.1007/s10863-019-09800-z] [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: 11/21/2018] [Accepted: 05/19/2019] [Indexed: 12/26/2022]
Abstract
Mitochondria are multifunctional and dynamic organelles deeply integrated into cellular physiology and metabolism. Disturbances in mitochondrial function are involved in several disorders such as neurodegeneration, cardiovascular diseases, metabolic diseases, and also in the aging process. Nicotine is a natural alkaloid present in the tobacco plant which has been well studied as a constituent of cigarette smoke. It has also been reported to influence mitochondrial function both in vitro and in vivo. This review presents a comprehensive overview of the present knowledge of nicotine action on mitochondrial function. Observed effects of nicotine exposure on the mitochondrial respiratory chain, oxidative stress, calcium homeostasis, mitochondrial dynamics, biogenesis, and mitophagy are discussed, considering the context of the experimental design. The potential action of nicotine on cellular adaptation and cell survival is also examined through its interaction with mitochondria. Although a large number of studies have demonstrated the impact of nicotine on various mitochondrial activities, elucidating its mechanism of action requires further investigation.
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Affiliation(s)
- Dominika Malińska
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Mariusz R Więckowski
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Bernadeta Michalska
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Karolina Drabik
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Monika Prill
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Paulina Patalas-Krawczyk
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Jarosław Walczak
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Jędrzej Szymański
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland
| | - Carole Mathis
- PMI R&D, Philip Morris Products S.A. (part of Philip Morris International group of companies), Quai Jeanrenaud 5, 2000, Neuchâtel, Switzerland
| | - Marco Van der Toorn
- PMI R&D, Philip Morris Products S.A. (part of Philip Morris International group of companies), Quai Jeanrenaud 5, 2000, Neuchâtel, Switzerland
| | - Karsta Luettich
- PMI R&D, Philip Morris Products S.A. (part of Philip Morris International group of companies), Quai Jeanrenaud 5, 2000, Neuchâtel, Switzerland
| | - Julia Hoeng
- PMI R&D, Philip Morris Products S.A. (part of Philip Morris International group of companies), Quai Jeanrenaud 5, 2000, Neuchâtel, Switzerland
| | - Manuel C Peitsch
- PMI R&D, Philip Morris Products S.A. (part of Philip Morris International group of companies), Quai Jeanrenaud 5, 2000, Neuchâtel, Switzerland
| | - Jerzy Duszyński
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland.
| | - Joanna Szczepanowska
- Nencki Institute of Experimental Biology, Polish Academy of Sciences, 3 Pasteur Street, 02-093, Warsaw, Poland.
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21
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Czekala L, Simms L, Stevenson M, Trelles-Sticken E, Walker P, Walele T. High Content Screening in NHBE cells shows significantly reduced biological activity of flavoured e-liquids, when compared to cigarette smoke condensate. Toxicol In Vitro 2019; 58:86-96. [PMID: 30880017 DOI: 10.1016/j.tiv.2019.03.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Revised: 03/12/2019] [Accepted: 03/13/2019] [Indexed: 01/05/2023]
Abstract
There is scientific agreement that the detrimental effects of cigarettes are produced by the formation of Harmful and Potentially Harmful Constituents from tobacco combustion and not by nicotine. For this reason numerous public health bodies and governments worldwide have indicated that e-cigarettes have a central role to play in tobacco harm reduction. In this study, high content screening (HCS) was used to compare the effects of neat e-liquids and 3R4F reference cigarette smoke condensate (CSC), which served as a positive control, in Normal Human Bronchial Epithelial (NHBE) cells. The endpoints measured covered cellular health, energy production and oxidative stress. Base liquids, with or without nicotine, and commercial, flavoured, nicotine-containing e-liquids (CFs), had little or no effect on cell viability and most HCS endpoints even at significantly higher concentrations (typically 100 times or higher) than 3R4F CSC. CSC induced a dose-dependent decrease of cell viability and triggered the response in all HCS endpoints. Effects of CFs were typically observed at or above 1%. CF Menthol was the most active flavour, with minimum effective concentrations 43 to 659 times higher than corresponding 3R4F CSC concentrations. Our results show a lower biological activity of e-liquids compared to cigarette smoke condensate in this experimental setting, across wide range of cellular endpoints.
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Affiliation(s)
- Lukasz Czekala
- Imperial Brands PLC, 121 Winterstoke Road, Bristol BS3 2LL, United Kingdom.
| | - Liam Simms
- Imperial Brands PLC, 121 Winterstoke Road, Bristol BS3 2LL, United Kingdom
| | - Matthew Stevenson
- Imperial Brands PLC, 121 Winterstoke Road, Bristol BS3 2LL, United Kingdom
| | - Edgar Trelles-Sticken
- Reemstma Cigarettenfabriken GmbH, An Imperial Brands Company, Albert Einstein Ring 7, D-22791 Hamburg, Germany
| | - Paul Walker
- Cyprotex No. 24 Mereside, Alderley Park, Nether Alderley, Cheshire SK10 4TG, United Kingdom
| | - Tanvir Walele
- Imperial Brands PLC, 121 Winterstoke Road, Bristol BS3 2LL, United Kingdom
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22
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Lee KM, Hoeng J, Harbo S, Kogel U, Gardner W, Oldham M, Benson E, Talikka M, Kondylis A, Martin F, Titz B, Ansari S, Trivedi K, Guedj E, Elamin A, Ivanov NV, Vanscheeuwijck P, Peitsch MC, McKinney WJ. Biological changes in C57BL/6 mice following 3 weeks of inhalation exposure to cigarette smoke or e-vapor aerosols. Inhal Toxicol 2019; 30:553-567. [DOI: 10.1080/08958378.2019.1576807] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Julia Hoeng
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | | | - Ulrike Kogel
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | | | | | | | - Marja Talikka
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | | | - Florian Martin
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | - Bjoern Titz
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | - Sam Ansari
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | - Keyur Trivedi
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | - Emmanuel Guedj
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
| | - Ashraf Elamin
- PMI R&D, Philip Morris Products S.A, Neuchâtel, Switzerland
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23
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Balkissoon R. Journal Club-Electronic Cigarettes and Vaping as a Harm Reduction Alternative: Really? CHRONIC OBSTRUCTIVE PULMONARY DISEASES-JOURNAL OF THE COPD FOUNDATION 2019; 6:281-291. [PMID: 31342733 DOI: 10.15326/jcopdf.6.3.2019.0143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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24
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Are electronic cigarettes a healthier alternative to conventional tobacco smoking? Eur Arch Otorhinolaryngol 2018; 276:17-25. [DOI: 10.1007/s00405-018-5185-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 10/25/2018] [Indexed: 02/02/2023]
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25
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Ahmad S, Zafar I, Mariappan N, Husain M, Wei CC, Vetal N, Eltoum IA, Ahmad A. Acute pulmonary effects of aerosolized nicotine. Am J Physiol Lung Cell Mol Physiol 2018; 316:L94-L104. [PMID: 30358437 DOI: 10.1152/ajplung.00564.2017] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Nicotine is a highly addictive principal component of both tobacco and electronic cigarette that is readily absorbed in blood. Nicotine-containing electronic cigarettes are promoted as a safe alternative to cigarette smoking. However, the isolated effects of inhaled nicotine are largely unknown. Here we report a novel rat model of aerosolized nicotine with a particle size (~1 μm) in the respirable diameter range. Acute nicotine inhalation caused increased pulmonary edema and lung injury as measured by enhanced bronchoalveolar lavage fluid protein, IgM, lung wet-to-dry weight ratio, and high-mobility group box 1 (HMGB1) protein and decreased lung E-cadherin protein. Immunohistochemical analysis revealed congested blood vessels and increased neutrophil infiltration. Lung myeloperoxidase mRNA and protein increased in the nicotine-exposed rats. Complete blood counts also showed an increase in neutrophils, white blood cells, eosinophils, and basophils. Arterial blood gas measurements showed an increase in lactate. Lungs of nicotine-inhaling animals revealed increased mRNA levels of IL-1A and CXCL1. There was also an increase in IL-1α protein. In in vitro air-liquid interface cultures of airway epithelial cells, there was a dose dependent increase in HMGB1 release with nicotine treatment. Air-liquid cultures exposed to nicotine also resulted in a dose-dependent loss of barrier as measured by transepithelial electrical resistance and a decrease in E-cadherin expression. Nicotine also caused a dose-dependent increase in epithelial cell death and an increase in caspase-3/7 activities. These results show that the nicotine content of electronic cigarettes may have adverse pulmonary and systemic effects.
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Affiliation(s)
- Shama Ahmad
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Iram Zafar
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Nithya Mariappan
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Maroof Husain
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Chih-Chang Wei
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Nilam Vetal
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham , Birmingham, Alabama
| | - Isam A Eltoum
- Department of Pathology, University of Alabama at Birmingham , Birmingham, Alabama
| | - Aftab Ahmad
- Department of Anesthesiology and Perioperative Medicine, University of Alabama at Birmingham , Birmingham, Alabama
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26
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Kyte SL, Gewirtz DA. The Influence of Nicotine on Lung Tumor Growth, Cancer Chemotherapy, and Chemotherapy-Induced Peripheral Neuropathy. J Pharmacol Exp Ther 2018; 366:303-313. [PMID: 29866790 PMCID: PMC6041956 DOI: 10.1124/jpet.118.249359] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 05/30/2018] [Indexed: 01/03/2023] Open
Abstract
Studies in animal models have suggested that nicotine, an agonist of nicotinic acetylcholine receptors, may have the potential to prevent and/or reverse the peripheral neuropathy induced by cancer chemotherapeutic drugs, such as paclitaxel and oxaliplatin. However, a large body of evidence suggests that nicotine may also stimulate lung tumor growth and/or interfere with the effectiveness of cancer chemotherapy. Whereas the reported proliferative effects of nicotine are highly variable, the antagonism of antitumor drug efficacy is more consistent, although this latter effect has been demonstrated primarily in cell culture studies. In contrast, in vitro and in vivo studies from our own laboratory indicate that nicotine fails to enhance the growth of nonsmall cell lung cancer cells or attenuate the effects of chemotherapy (paclitaxel). Given the inconsistencies in the literature, coupled with our own findings, the weight of evidence suggests that caution may be warranted in proposing to use nicotine to mitigate chemotherapy-induced peripheral neuropathy in cancer patients receiving chemotherapy. Conversely, clinical trials could be performed in patients who have completed therapy and are considered to be disease-free to determine whether nicotine, in the form of commercially available patches or gum, is effective in alleviating peripheral neuropathy symptoms.
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Affiliation(s)
- S Lauren Kyte
- Department of Pharmacology and Toxicology (S.L.K., D.A.G.) and Massey Cancer Center (D.A.G.), Virginia Commonwealth University, Richmond, Virginia
| | - David A Gewirtz
- Department of Pharmacology and Toxicology (S.L.K., D.A.G.) and Massey Cancer Center (D.A.G.), Virginia Commonwealth University, Richmond, Virginia
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27
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Yu W, Hu B, Shi X, Cao Z, Ren M, He Z, Lin J, Deng H, Hu R. Nicotine inhibits osteogenic differentiation of human periodontal ligament cells under cyclic tensile stress through canonical Wnt pathway and α7 nicotinic acetylcholine receptor. J Periodontal Res 2018; 53:555-564. [PMID: 29603740 DOI: 10.1111/jre.12545] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/13/2018] [Indexed: 12/29/2022]
Abstract
BACKGROUND AND OBJECTIVES Nicotine, the main psychoactive component of tobacco, affects cell metabolism, proliferation, adhesion and, importantly, the osteogenic differentiation of fibroblasts. Approximately 15% of all orthodontic patients are adults among who one-fifth are smokers. Hence, it is necessary to have insight into the effects of nicotine on the osteogenic differentiation of hPDLCs during orthodontic tooth movement. This study aimed to investigate the effects and mechanisms of nicotine on the osteogenic differentiation of human periodontal ligament cells (hPDLCs) under the application of cyclic tensile stress. MATERIAL AND METHODS hPDLCs were obtained from donor third molars. The hPDLCs were treated with nicotine and/or cyclic tensile stress that was applied with a cell stress plus unit. The effect of nicotine on cell viability was analyzed using the MTT assay. The osteogenic differentiation of hPDLCs was detected by alkaline phosphatase staining, Alizarin Red S staining, quantitative real-time polymerase chain reaction and western blotting. RESULTS In combination with cyclic tensile stress, nicotine prevented the tensile stress-induced increase in alkaline phosphatase activity, formation of mineralization nodules and the upregulation of mRNA and protein expression of Runt-related transcription factor 2, transcription factor Sp7 and collagen type I; however, canonical Wnt pathway was activated. Furthermore, the addition of Dickkopf-related protein 1 and α-bungarotoxin counteracted the negative effect of nicotine and rescued the osteogenic differentiation of hPDLCs, respectively. CONCLUSION These results indicate that nicotine prevents the increased osteogenic potential of hPDLCs induced by cyclic tensile stress by binding to an α7 nicotinic acetylcholine receptor and activating the canonical Wnt pathway.
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Affiliation(s)
- W Yu
- Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - B Hu
- Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - X Shi
- Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - Z Cao
- Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - M Ren
- Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - Z He
- Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - J Lin
- Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - H Deng
- Department of Periodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
| | - R Hu
- Department of Orthodontics, School of Stomatology, Wenzhou Medical University, Wenzhou, China
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28
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Tang H, Zhang Y, Ma Y, Tang M, Shen D, Wang M. Regulation of Nicotine Tolerance by Quorum Sensing and High Efficiency of Quorum Quenching Under Nicotine Stress in Pseudomonas aeruginosa PAO1. Front Cell Infect Microbiol 2018; 8:88. [PMID: 29616198 PMCID: PMC5869914 DOI: 10.3389/fcimb.2018.00088] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2018] [Accepted: 03/06/2018] [Indexed: 01/01/2023] Open
Abstract
Quorum sensing (QS) regulates the behavior of bacterial populations and promotes their adaptation and survival under stress. As QS is responsible for the virulence of vast majority of bacteria, quorum quenching (QQ), the interruption of QS, has become an attractive therapeutic strategy. However, the role of QS in stress tolerance and the efficiency of QQ under stress in bacteria are seldom explored. In this study, we demonstrated that QS-regulated catalase (CAT) expression and biofilm formation help Pseudomonas aeruginosa PAO1 resist nicotine stress. CAT activity and biofilm formation in wild type (WT) and ΔrhlR strains are significantly higher than those in the ΔlasR strain. Supplementation of ΔlasI strain with 3OC12-HSL showed similar CAT activity and biofilm formation as those of the WT strain. LasIR circuit rather than RhlIR circuit is vital to nicotine tolerance. Acylase I significantly decreased the production of virulence factors, namely elastase, pyocyanin, and pyoverdine under nicotine stress compared to the levels observed in the absence of nicotine stress. Thus, QQ is more efficient under stress. To our knowledge, this is the first study to report that QS contributes to nicotine tolerance in P. aeruginosa. This work facilitates a better application of QQ for the treatment of bacterial infections, especially under stress.
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Affiliation(s)
- Huiming Tang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Yunyun Zhang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, China
| | - Yifan Ma
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Mengmeng Tang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Dongsheng Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, China
| | - Meizhen Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China.,Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, China
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29
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Lee PN, Fariss MW. A systematic review of possible serious adverse health effects of nicotine replacement therapy. Arch Toxicol 2017; 91:1565-1594. [PMID: 27699443 PMCID: PMC5364244 DOI: 10.1007/s00204-016-1856-y] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 09/22/2016] [Indexed: 12/11/2022]
Abstract
We conducted a systematic literature review to identify and critically evaluate studies of serious adverse health effects (SAHEs) in humans using nicotine replacement therapy (NRT) products. Serious adverse health effects refer to adverse events, leading to substantial disruption of the ability to conduct normal life functions. Strength of evidence evaluations and conclusions were also determined for the identified SAHEs. We evaluated 34 epidemiological studies and clinical trials, relating NRT use to cancer, reproduction/development, CVD, stroke and/or other SAHEs in patients, and four meta-analyses on effects in healthy populations. The overall evidence suffers from many limitations, the most significant being the short-term exposure (≤12 weeks) and follow-up to NRT product use in most of the studies, the common failure to account for changes in smoking behaviour following NRT use, and the sparse information on SAHEs by type of NRT product used. The only SAHE from NRT exposure we identified was an increase in respiratory congenital abnormalities reported in one study. Limited evidence indicated a lack of effect between NRT exposure and SAHEs for CVD and various reproduction/developmental endpoints. For cancer, stroke and other SAHEs, the evidence was inadequate to demonstrate any association with NRT use. Our conclusions agree with recent statements from authoritative bodies.
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Affiliation(s)
- Peter N. Lee
- P N Lee Statistics and Computing Ltd, 17 Cedar Road, Sutton, Surrey SM2 5DA UK
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30
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Gonzalez-Suarez I, Marescotti D, Martin F, Scotti E, Guedj E, Acali S, Dulize R, Baumer K, Peric D, Frentzel S, Ivanov NV, Hoeng J, Peitsch MC. In Vitro Systems Toxicology Assessment of Nonflavored e-Cigarette Liquids in Primary Lung Epithelial Cells. ACTA ACUST UNITED AC 2017. [DOI: 10.1089/aivt.2016.0040] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Ignacio Gonzalez-Suarez
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Diego Marescotti
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Florian Martin
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Elena Scotti
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Emmanuel Guedj
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Stefano Acali
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Remi Dulize
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Karine Baumer
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Dariusz Peric
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Stefan Frentzel
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Nikolai V. Ivanov
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Julia Hoeng
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
| | - Manuel C. Peitsch
- Philip Morris International R&D, Philip Morris Products S.A., Neuchâtel, Switzerland (part of Philip Morris International group of companies)
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31
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Coffa BG, Coggins CRE, Werley MS, Oldham MJ, Fariss MW. Chemical, physical, and in vitro characterization of research cigarettes containing denicotinized tobacco. Regul Toxicol Pharmacol 2016; 79:64-73. [PMID: 27181452 DOI: 10.1016/j.yrtph.2016.05.016] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 05/04/2016] [Accepted: 05/11/2016] [Indexed: 12/18/2022]
Abstract
The use of very low nicotine tobacco cigarettes is currently being investigated as a possible harm reduction strategy. Here, we report the smoke chemistry, toxicity, and physical characteristics of very low nicotine cigarettes that were made using blended tobacco processed through a supercritical CO2 fluid extraction, which resulted in elimination of 96% of nicotine content (denicotinized (denic) tobacco). Three types of test cigarettes (TCs) were manufactured with tobacco filler containing 100% denic tobacco (TC100), 50% denic tobacco and 50% unextracted tobacco (TC50/50), and 100% unextracted tobacco (TC0). Mainstream smoke (MS) was generated for measurement of 46 analytes and cytotoxicity and mutagenicity determination. Analysis of physical characteristics of TCs demonstrated they were well made with <5% variability among cigarettes for most parameters measured. We observed significant changes in the levels of smoke constituents, including decreases in formaldehyde, nitrosamines, and phenol, and increases in aliphatic hydrocarbons, aliphatic nitrogen compounds, aromatic amines, halogen compounds, and metals. Use of denic tobacco resulted in changes in the chemical composition of MS, but these changes did not modify biological activity as measured in the mutagenicity and cytotoxicity assays.
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