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Zhang C, Liu D, Gao H. Kinetics, physicochemical properties, and antioxidant activities of Angelica keiskei processed under four drying conditions. Lebensm Wiss Technol 2018. [DOI: 10.1016/j.lwt.2018.08.054] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Fagundes GE, Damiani AP, Borges GD, Teixeira KO, Jesus MM, Daumann F, Ramlov F, Carvalho T, Leffa DD, Rohr P, Moraes De Andrade V. Effect of green juice and their bioactive compounds on genotoxicity induced by alkylating agents in mice. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2017; 80:756-766. [PMID: 28850003 DOI: 10.1080/15287394.2017.1357307] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Kale juice (Brassica oleracea L. var. acephala D.C.) is a reliable source of dietary carotenoids and typically contains the highest concentrations of lutein (LT) and beta-carotene (BC) among green leafy vegetables. As a result of their antioxidant properties, dietary carotenoids are postulated to decrease the risk of disease occurrence, particularly certain cancers. The present study aimed to (1) examine the genotoxic and antigenotoxic activity of natural and commercially available juices derived from Brassica oleracea and (2) assess influence of LT or BC against DNA damage induced by alkylating agents such as methyl methanesulfonate (MS) or cyclophosphamide (CP) in vivo in mice. Male Swiss mice were divided into groups of 6 animals, which were treated with water, natural, or commercial Brassica oleraceae juices (kale), LT, BC, MMS, or CP. After treatment, DNA damage was determined in peripheral blood lymphocytes using the comet assay. Results demonstrated that none of the Brassica oleraceae juices or carotenoids produced genotoxic effects. In all examined cell types, kale juices or carotenoids inhibited DNA damage induced by MMS or CP administered either pre- or posttreatment by 50 and 20%, respectively. Under our experimental conditions, kale leaf juices alone exerted no marked genotoxic or clastogenic effects. However, a significant decrease in DNA damage induced by MMS or CP was noted. This effect was most pronounced in groups that received juices, rather than carotenoids, suggesting that the synergy among constituents present in the food matrix may be more beneficial than the action of single compounds. Data suggest that the antigenotoxic properties of kale juices may be of therapeutic importance.
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Affiliation(s)
- Gabriela Elibio Fagundes
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Adriani Paganini Damiani
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Gabriela Daminelli Borges
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Karina Oliveira Teixeira
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Maiellen Martins Jesus
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Francine Daumann
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Fernanda Ramlov
- b Laboratory of Plant Morphogenesis and Biochemistry, Department of Botany , Federal University of Santa Catarina (UFSC) , Florianópolis , SC , Brazil
| | - Tiago Carvalho
- b Laboratory of Plant Morphogenesis and Biochemistry, Department of Botany , Federal University of Santa Catarina (UFSC) , Florianópolis , SC , Brazil
| | - Daniela Dimer Leffa
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Paula Rohr
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
| | - Vanessa Moraes De Andrade
- a Laboratory of Cellular and Molecular Biology (LABIM), Post-graduate Program in Health Sciences University of the Extreme South of Santa Catarina (UNESC) , Criciúma , SC , Brazil
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Plant flavonoids in cancer chemoprevention: role in genome stability. J Nutr Biochem 2017; 45:1-14. [DOI: 10.1016/j.jnutbio.2016.11.007] [Citation(s) in RCA: 215] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 08/27/2016] [Accepted: 11/14/2016] [Indexed: 12/13/2022]
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Kil YS, Pham ST, Seo EK, Jafari M. Angelica keiskei, an emerging medicinal herb with various bioactive constituents and biological activities. Arch Pharm Res 2017; 40:655-675. [PMID: 28439780 PMCID: PMC7090720 DOI: 10.1007/s12272-017-0892-3] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 01/30/2017] [Indexed: 01/14/2023]
Abstract
Angelica keiskei (Miq.) Koidz. (Umbelliferae) has traditionally been used to treat dysuria, dyschezia, and dysgalactia as well as to restore vitality. Recently, the aerial parts of A. keiskei have been consumed as a health food. Various flavonoids, coumarins, phenolics, acetylenes, sesquiterpene, diterpene, and triterpenes were identified as the constituents of A. keiskei. The crude extracts and pure constituents were proven to inhibit tumor growth and ameliorate inflammation, obesity, diabetics, hypertension, and ulcer. The extract also showed anti-thrombotic, anti-oxidative, anti-hyperlipidemic, anti-viral, and anti-bacterial activities. This valuable herb needs to be further studied and developed not only to treat these human diseases but also to improve human health. Currently A. keiskei is commercialized as a health food and additives in health drinks. This article presents a comprehensive review of A. keiskei and its potential place in the improvement of human health.
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Affiliation(s)
- Yun-Seo Kil
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, 03760, Korea
| | - Sally T Pham
- Department of Pharmaceutical Sciences, University of California, Irvine, CA, 92697, USA
| | - Eun Kyoung Seo
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, 03760, Korea.
| | - Mahtab Jafari
- Department of Pharmaceutical Sciences, University of California, Irvine, CA, 92697, USA.
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Kil YS, Choi SK, Lee YS, Jafari M, Seo EK. Chalcones from Angelica keiskei: Evaluation of Their Heat Shock Protein Inducing Activities. JOURNAL OF NATURAL PRODUCTS 2015; 78:2481-2487. [PMID: 26431394 DOI: 10.1021/acs.jnatprod.5b00633] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Five new chalcones, 4,2',4'-trihydroxy-3'-[(2E,5E)-7-methoxy-3,7-dimethyl-2,5-octadienyl]chalcone (1), (±)-4,2',4'-trihydroxy-3'-[(2E)-6-hydroxy-7-methoxy-3,7-dimethyl-2-octenyl]chalcone (2), 4,2',4'-trihydroxy-3'-[(2E)-3-methyl-5-(1,3-dioxolan-2-yl)-2-pentenyl]chalcone (3), 2',3'-furano-4-hydroxy-4'-methoxychalcone (4), and (±)-4-hydroxy-2',3'-(2,3-dihydro-2-methoxyfurano)-4'-methoxychalcone (5), were isolated from the aerial parts of Angelica keiskei Koidzumi together with eight known chalcones, 6-13, which were identified as (±)-4,2',4'-trihydroxy-3'-[(6E)-2-hydroxy-7-methyl-3-methylene-6-octenyl]chalcone (6), xanthoangelol (7), xanthoangelol F (8), xanthoangelol G (9), 4-hydroxyderricin (10), xanthoangelol D (11), xanthoangelol E (12), and xanthoangelol H (13), respectively. Chalcones 1-13 were evaluated for their promoter activity on heat shock protein 25 (hsp25, murine form of human hsp27). Compounds 1 and 6 activated the hsp25 promoter by 21.9- and 29.2-fold of untreated control at 10 μM, respectively. Further protein expression patterns of heat shock factor 1 (HSF1), HSP70, and HSP27 by 1 and 6 were examined. Compound 6 increased the expression of HSF1, HSP70, and HSP27 by 4.3-, 1.5-, and 4.6-fold of untreated control, respectively, without any significant cellular cytotoxicities, whereas 1 did not induce any expression of these proteins. As a result, 6 seems to be a prospective HSP inducer.
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Affiliation(s)
- Yun-Seo Kil
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University , Seoul 120-750, Korea
| | - Seul-Ki Choi
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University , Seoul 120-750, Korea
| | - Yun-Sil Lee
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University , Seoul 120-750, Korea
| | - Mahtab Jafari
- Department of Pharmaceutical Sciences, University of California , Irvine, California 92697, United States
| | - Eun-Kyoung Seo
- College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University , Seoul 120-750, Korea
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Correa CR, Chen CYO, Aldini G, Rasmussen H, Ronchi CF, Berchieri-Ronchi C, Cho SM, Blumberg JB, Yeum KJ. Bioavailability of plant pigment phytochemicals in Angelica keiskei in older adults: A pilot absorption kinetic study. Nutr Res Pract 2014; 8:550-7. [PMID: 25324936 PMCID: PMC4198969 DOI: 10.4162/nrp.2014.8.5.550] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 03/10/2014] [Accepted: 03/12/2014] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND/OBJECTIVES Angelica keiskei is a green leafy vegetable rich in plant pigment phytochemicals such as flavonoids and carotenoids. This study examined bioavailability of flavonoids and carotenoids in Angelica keiskei and the alteration of the antioxidant performance in vivo. SUBJECTS AND MATERIALS Absorption kinetics of phytochemicals in Angelica keiskei were determined in healthy older adults (> 60 y, n = 5) and subjects with metabolic syndrome (n = 5). Subjects consumed 5 g dry Angelica keiskei powder encapsulated in gelatin capsules with a low flavonoid and carotenoid liquid meal. Plasma samples were collected at baseline, 0.5, 1, 2, 3, 4, 5, 6, 7, and 8 h. Samples were analyzed for flavonoids and carotenoids using HPLC systems with electrochemical and UV detection, respectively, and for total antioxidant performance by fluorometry. RESULTS After ingestion of Angelica keiskei increases in plasma quercetin concentrations were observed at 1-3 and 6-8 hr in the healthy group and at all time points in the metabolic syndrome group compared to baseline (P < 0.05). Plasma lutein concentrations were significantly elevated in both the healthy and metabolic syndrome groups at 8 hr (P < 0.05). Significant increases in total antioxidant performance were also observed in both the healthy and the metabolic syndrome groups compared to baseline (P < 0.05). CONCLUSIONS Findings of this study clearly demonstrate the bioavailability of phytonutrients of Angelica keiskei and their ability to increase antioxidant status in humans.
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Affiliation(s)
- Camila R Correa
- Jean Mayer USDA- Human Nutrition Research Center on Aging, Tufts University, 711 Washington St., Boston, MA 02111, USA. ; Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Distrito Rubiao Jr. s/n, 18618-970 Botucatu, SP, Brazil
| | - C-Y Oliver Chen
- Jean Mayer USDA- Human Nutrition Research Center on Aging, Tufts University, 711 Washington St., Boston, MA 02111, USA
| | - Giancarlo Aldini
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, 20133 Milan, Italy
| | - Helen Rasmussen
- Jean Mayer USDA- Human Nutrition Research Center on Aging, Tufts University, 711 Washington St., Boston, MA 02111, USA
| | - Carlos F Ronchi
- Jean Mayer USDA- Human Nutrition Research Center on Aging, Tufts University, 711 Washington St., Boston, MA 02111, USA. ; Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Distrito Rubiao Jr. s/n, 18618-970 Botucatu, SP, Brazil
| | - Carolina Berchieri-Ronchi
- Jean Mayer USDA- Human Nutrition Research Center on Aging, Tufts University, 711 Washington St., Boston, MA 02111, USA. ; Department of Internal Medicine, Botucatu Medical School, São Paulo State University (UNESP), Distrito Rubiao Jr. s/n, 18618-970 Botucatu, SP, Brazil
| | - Soo-Muk Cho
- National Academy of Agricultural Science, Rural Development Administration, Suwon 441-853, Republic of Korea
| | - Jeffrey B Blumberg
- Jean Mayer USDA- Human Nutrition Research Center on Aging, Tufts University, 711 Washington St., Boston, MA 02111, USA
| | - Kyung-Jin Yeum
- College of Biomedical and Health Sciences, Konkuk University, Chungju-si, 380-701, Republic of Korea
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Chang AS, Yeong BY, Koh WP. Symposium on Plant Polyphenols: Nutrition, Health and Innovations, June 2009. Nutr Rev 2010; 68:246-52. [PMID: 20416020 DOI: 10.1111/j.1753-4887.2010.00283.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Reported here is a summary of the proceedings of the Symposium on Plant Polyphenols: Nutrition, Health and Innovations, which was cosponsored by the Southeast Asia Region branch of the International Life Sciences Institute and the Nutrition Society of Malaysia in Kuala Lumpur, Malaysia, June 22-23, 2009. The symposium provided a timely update of research regarding the protective effects of polyphenols in chronic diseases, such as cardiovascular disease and cancer, as well as the development of innovative polyphenol-containing food products with enhanced nutritive and health properties. Presentations covered polyphenols from a wide range of food sources such as tea, coffee, nuts and seeds, cocoa and chocolate, soy, and Asian fruits, vegetables, and spices. The symposium was attended by a large and diverse group of nutritionists, dietitians, researchers and allied health professionals, as well as management, research and development, and marketing personnel from the food and beverage industry. Their enthusiastic participation was a testament to the increasing awareness and interest in polyphenols in the prevention and control of chronic diseases. Presented here are some of the highlights and important information from the symposium.
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Affiliation(s)
- Ann S Chang
- Southeast Asia Region Branch of the International Life Sciences Institute, Singapore
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Lee SH, Kang HJ, Lee HJ, Kang MH, Park YK. Six-week supplementation with Chlorella has favorable impact on antioxidant status in Korean male smokers. Nutrition 2010; 26:175-83. [DOI: 10.1016/j.nut.2009.03.010] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2008] [Revised: 03/27/2009] [Accepted: 03/27/2009] [Indexed: 11/25/2022]
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Inter-individual variation in DNA damage and base excision repair in young, healthy non-smokers: effects of dietary supplementation and genotype. Br J Nutr 2010; 103:1585-93. [PMID: 20082738 DOI: 10.1017/s0007114509993540] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Diets rich in fruits and vegetables are associated with lower risk of cancer which may be conferred in part by the antioxidant properties of these foods. However, antioxidant supplementation or increased consumption of antioxidant-rich foods has been reported to have inconsistent effects on DNA damage. The present work (the DART study) investigated the extent of inter-individual variation in DNA damage, the capacity for base excision repair (BER) and the responses of both variables to supplementation with an antioxidant supplement for 6 weeks. There was a wide inter-individual variation in endogenous lymphocyte DNA strand breaks (8-fold variation), in damage after a challenge with H2O2 (16-fold variation) and in DNA repair (41-fold variation) measured using the comet assay. When stratified into tertiles according to the pre-supplementation level of endogenous DNA damage, there was a statistically significant decrease in DNA damage after supplementation in the tertile with the highest pre-supplementation level of damage. There was no effect of supplementation on BER. Endogenous DNA damage level before supplementation was significantly different (P = 0.037) between the three genotypes for the Val16Ala single nucleotide polymorphism in manganese superoxide dismutase (rs4880) with individuals homozygous/wild type showing less damage than those carrying the alanine variant.
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Dhawan A, Bajpayee M, Parmar D. The Comet Assay: A Versatile Tool for Assessing DNA Damage. THE COMET ASSAY IN TOXICOLOGY 2009. [DOI: 10.1039/9781847559746-00003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Alok Dhawan
- Developmental Toxicology Division Indian Institute of Toxicology Research (Formerly Industrial Toxicology Research Centre) P.O. Box 80 M.G. Marg Lucknow 226 001 India
| | - Mahima Bajpayee
- Developmental Toxicology Division Indian Institute of Toxicology Research (Formerly Industrial Toxicology Research Centre) P.O. Box 80 M.G. Marg Lucknow 226 001 India
| | - Devendra Parmar
- Developmental Toxicology Division Indian Institute of Toxicology Research (Formerly Industrial Toxicology Research Centre) P.O. Box 80 M.G. Marg Lucknow 226 001 India
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Dhawan A, Bajpayee M, Parmar D. Comet assay: a reliable tool for the assessment of DNA damage in different models. Cell Biol Toxicol 2008; 25:5-32. [PMID: 18427939 DOI: 10.1007/s10565-008-9072-z] [Citation(s) in RCA: 241] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2007] [Accepted: 03/17/2008] [Indexed: 11/29/2022]
Abstract
New chemicals are being added each year to the existing burden of toxic substances in the environment. This has led to increased pollution of ecosystems as well as deterioration of the air, water, and soil quality. Excessive agricultural and industrial activities adversely affect biodiversity, threatening the survival of species in a particular habitat as well as posing disease risks to humans. Some of the chemicals, e.g., pesticides and heavy metals, may be genotoxic to the sentinel species and/or to non-target species, causing deleterious effects in somatic or germ cells. Test systems which help in hazard prediction and risk assessment are important to assess the genotoxic potential of chemicals before their release into the environment or commercial use as well as DNA damage in flora and fauna affected by contaminated/polluted habitats. The Comet assay has been widely accepted as a simple, sensitive, and rapid tool for assessing DNA damage and repair in individual eukaryotic as well as some prokaryotic cells, and has increasingly found application in diverse fields ranging from genetic toxicology to human epidemiology. This review is an attempt to comprehensively encase the use of Comet assay in different models from bacteria to man, employing diverse cell types to assess the DNA-damaging potential of chemicals and/or environmental conditions. Sentinel species are the first to be affected by adverse changes in their environment. Determination of DNA damage using the Comet assay in these indicator organisms would thus provide information about the genotoxic potential of their habitat at an early stage. This would allow for intervention strategies to be implemented for prevention or reduction of deleterious health effects in the sentinel species as well as in humans.
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Affiliation(s)
- Alok Dhawan
- Developmental Toxicology Division, Indian Institute of Toxicology Research (formerly Industrial Toxicology Research Centre), PO Box 80, M.G. Marg, Lucknow, 226 001, India.
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Gill CIR, Haldar S, Boyd LA, Bennett R, Whiteford J, Butler M, Pearson JR, Bradbury I, Rowland IR. Watercress supplementation in diet reduces lymphocyte DNA damage and alters blood antioxidant status in healthy adults. Am J Clin Nutr 2007; 85:504-10. [PMID: 17284750 DOI: 10.1093/ajcn/85.2.504] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Cruciferous vegetable (CV) consumption is associated with a reduced risk of several cancers in epidemiologic studies. OBJECTIVE The aim of this study was to determine the effects of watercress (a CV) supplementation on biomarkers related to cancer risk in healthy adults. DESIGN A single-blind, randomized, crossover study was conducted in 30 men and 30 women (30 smokers and 30 nonsmokers) with a mean age of 33 y (range: 19-55 y). The subjects were fed 85 g raw watercress daily for 8 wk in addition to their habitual diet. The effect of supplementation was measured on a range of endpoints, including DNA damage in lymphocytes (with the comet assay), activity of detoxifying enzymes (glutathione peroxidase and superoxide dismutase) in erythrocytes, plasma antioxidants (retinol, ascorbic acid, alpha-tocopherol, lutein, and beta-carotene), plasma total antioxidant status with the use of the ferric reducing ability of plasma assay, and plasma lipid profile. RESULTS Watercress supplementation (active compared with control phase) was associated with reductions in basal DNA damage (by 17%; P = 0.03), in basal plus oxidative purine DNA damage (by 23.9%; P = 0.002), and in basal DNA damage in response to ex vivo hydrogen peroxide challenge (by 9.4%; P = 0.07). Beneficial changes seen after watercress intervention were greater and more significant in smokers than in nonsmokers. Plasma lutein and beta-carotene increased significantly by 100% and 33% (P < 0.001), respectively, after watercress supplementation. CONCLUSION The results support the theory that consumption of watercress can be linked to a reduced risk of cancer via decreased damage to DNA and possible modulation of antioxidant status by increasing carotenoid concentrations.
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Affiliation(s)
- Chris I R Gill
- Northern Ireland Centre for Food and Health, Centre for Molecular Biosciences, University of Ulster, Coleraine, N Ireland, United Kingdom.
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Hoffmann H, Högel J, Speit G. The effect of smoking on DNA effects in the comet assay: a meta-analysis. Mutagenesis 2005; 20:455-66. [PMID: 16280345 DOI: 10.1093/mutage/gei064] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The comet assay (alkaline single-cell gel electrophoresis, SCG or SCGE) is frequently used in biomonitoring to detect genotoxic effects in humans exposed at the workplace or in their environment. Because of its ready accessibility, blood is most frequently used in such studies. Many studies investigated cigarette smoking either as a genotoxic exposure itself or as a potential confounding factor in occupational studies. However, although smoking is considered to be a relevant exposure towards various genotoxins, conflicting results have been reported in the comet assay studies. The actual reasons for this discrepancy are not known. To further evaluate evidence for smoking-related DNA effects in the comet assay, we now used a meta-analysis approach based on a literature search. We identified 38 studies from 37 publications which were suited for a formal meta-analysis based on the standardized mean difference (SMD) between the study groups. The evaluation of these 38 studies indicated higher levels of DNA damage in smokers than in non-smokers [under a random effects model, SMD = 0.55, 95% confidence interval = (0.16-0.93)]. Subdividing these studies into studies investigating the effect of smoking as a genotoxic exposure (Type A studies, n = 12) and studies investigating smoking as a potential confounder in occupational studies (Type B, n = 26) indicated a significant difference only in Type A studies but not in Type B studies. Furthermore, studies using image analysis or image length measurements (n = 23) only indicated a tendency for a genotoxic effect of smoking, whereas studies using an arbitrary score (n = 15) found a significantly higher level of DNA damage in smokers.
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