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Sule RO, Condon L, Gomes AV. A Common Feature of Pesticides: Oxidative Stress-The Role of Oxidative Stress in Pesticide-Induced Toxicity. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:5563759. [PMID: 35096268 PMCID: PMC8791758 DOI: 10.1155/2022/5563759] [Citation(s) in RCA: 98] [Impact Index Per Article: 49.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Accepted: 12/17/2021] [Indexed: 12/16/2022]
Abstract
Pesticides are important chemicals or biological agents that deter or kill pests. The use of pesticides has continued to increase as it is still considered the most effective method to reduce pests and increase crop growth. However, pesticides have other consequences, including potential toxicity to humans and wildlife. Pesticides have been associated with increased risk of cardiovascular disease, cancer, and birth defects. Labels on pesticides also suggest limiting exposure to these hazardous chemicals. Based on experimental evidence, various types of pesticides all seem to have a common effect, the induction of oxidative stress in different cell types and animal models. Pesticide-induced oxidative stress is caused by both reactive oxygen species (ROS) and reactive nitrogen species (RNS), which are associated with several diseases including cancer, inflammation, and cardiovascular and neurodegenerative diseases. ROS and RNS can activate at least five independent signaling pathways including mitochondrial-induced apoptosis. Limited in vitro studies also suggest that exogenous antioxidants can reduce or prevent the deleterious effects of pesticides.
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Affiliation(s)
- Rasheed O. Sule
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, Davis, CA 95616, USA
| | - Liam Condon
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, Davis, CA 95616, USA
| | - Aldrin V. Gomes
- Department of Neurobiology, Physiology and Behavior, University of California, Davis, Davis, CA 95616, USA
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA 95616, USA
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Azadnasab R, Kalantar H, Khorsandi L, Kalantari H, Khodayar MJ. Epicatechin ameliorative effects on methotrexate-induced hepatotoxicity in mice. Hum Exp Toxicol 2021; 40:S603-S610. [PMID: 34802285 DOI: 10.1177/09603271211047924] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Due to the fact that methotrexate is widely used both as an immunosuppressive drug and as a chemotherapy agent, many studies are needed to reduce the side effects of this drug on non-target organs. PURPOSE This study was designed to investigate the effects of epicatechin (Epi) on MTX (methotrexate)-induced hepatotoxicity in mice. RESEARCH DESIGN After 1 week for adaptation, we randomly divided 42 male Naval Medical Research Institute mice into six groups: (I) control; (II) Epi (100 mg/kg, po); (III) MTX (20 mg/kg, i.p.) on the fifth day; and (IV, V, and VI) Epi (25, 50, and 100 mg/kg, po) + MTX (20 mg/kg, i.p.) on the fifth day. At day 10, the mice were sacrificed and serum factors, oxidative stress markers, and inflammatory cytokines were measured. RESULTS MTX increased activity level of serum enzymes (alanine aminotransferase and aspartate aminotransferase), lipid peroxidation marker (malondialdehyde), and inflammatory factors including interleukin-1 beta, tumor necrosis factor-alpha, and nitric oxide. Furthermore, MTX decreased glutathione level and activity level of catalase, superoxide dismutase, and glutathione peroxidase. Epi was able to reduce the destructive effects of oxidative/antioxidant system imbalance and inflammatory reactions and also histopathological damage in MTX intoxicated mice. Epi pretreatment reduced liver dysfunction by improving the antioxidant defense system, anti-inflammatory effects, and alleviation of histopathological damage in MTX hepatotoxicity. CONCLUSIONS Accordingly, Epi can be used as a therapeutic agent in hepatotoxicity associated with MTX chemotherapy.
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Affiliation(s)
- Reza Azadnasab
- Toxicology Research Center, Medical Basic Sciences Research Institute, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Department of Toxicology, Faculty of Pharmacy, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Hadi Kalantar
- Toxicology Research Center, Medical Basic Sciences Research Institute, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Department of Toxicology, Faculty of Pharmacy, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Layasadat Khorsandi
- Cellular and Molecular Research Center, Medical Basic Sciences Research Institute, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Heibatullah Kalantari
- Toxicology Research Center, Medical Basic Sciences Research Institute, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Department of Toxicology, Faculty of Pharmacy, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Mohammad Javad Khodayar
- Toxicology Research Center, Medical Basic Sciences Research Institute, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.,Department of Toxicology, Faculty of Pharmacy, 48407Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
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3
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Afolabi OK, Aderibigbe FA, Folarin DT, Arinola A, Wusu AD. Oxidative stress and inflammation following sub-lethal oral exposure of cypermethrin in rats: mitigating potential of epicatechin. Heliyon 2019; 5:e02274. [PMID: 31440603 PMCID: PMC6700339 DOI: 10.1016/j.heliyon.2019.e02274] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 07/23/2019] [Accepted: 08/06/2019] [Indexed: 12/15/2022] Open
Abstract
Cypermethrin (CYP), a synthetic pyrethroid is a common environmental toxicant owing to its wide usage as a broad-spectrum insecticide. Its exposure to non-target organisms, including man, elicits numerous adverse effects making it a major public health issue. Epicatechin (EC) has proven anti-oxidative and anti-inflammatory properties. The present study was undertaken to evaluate the protective efficacy of epicatechin with regards to altered oxidative and inflammatory parameters subsequent to CYP treatment in rats. Animals were divided into four groups. The first group served as the control, while groups 2, 3, and 4 were orally treated with EC (30 mg kg-1 body weight), CYP (25 mg kg-1 body weight), and CYP plus EC, respectively. Oral administration of CYP for 14 days increased the levels of oxidative stress markers such as malondialdehyde, lipid hydroperoxides, and advanced oxidized protein products in the liver and kidney. These were accompanied by a decrease in glutathione and total antioxidant capacity levels. The activity of the enzyme superoxide dismutase was increased while catalase and glutathione peroxidase activities were decreased in these organs. Moreover, CYP increased plasma levels of the pro-inflammatory cytokines, interleukin-6 and tumor necrosis factor alpha. The plasma content of the nitrative nucleic acid marker, 8-nitroguanine was also markedly elevated by CYP. Administration of EC to CYP-exposed rats mitigated the induced oxidative and inflammatory effects. These data suggest that EC can attenuate the toxic effects induced by CYP exposure.
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Ben Saad A, Ncib S, Rjeibi I, Saidi I, Zouari N. Nephroprotective and antioxidant effect of green tea ( Camellia sinensis) against nicotine-induced nephrotoxicity in rats and characterization of its bioactive compounds by HPLC-DAD. Appl Physiol Nutr Metab 2019; 44:1134-1140. [PMID: 30802143 DOI: 10.1139/apnm-2017-0834] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Nicotine is a potential inducer of oxidative stress, through which it can damage numerous biological molecules. Natural antioxidants that prevent or slow the progression and severity of nicotine toxicity may have a significant health impact. The purpose of this study, conducted on Wistar rats, was to evaluate the beneficial effects of green tea (Camellia sinensis) extract on nicotine treatment-induced damage on kidney. Our results showed that nicotine significantly (p < 0.01) increased serum and kidney malondialdehyde, the serum contents of urea, creatinine, and uric acid. In addition, nicotine intoxication significantly (p < 0.01) decreased the levels of vitamins E and C in serum and kidney tissue as well as the activities of superoxide dismutase, catalase, and glutathione peroxidase. Interestingly, animals that were pretreated with green tea, prior to nicotine administration, showed a significant nephroprotection, revealed by a significant reduction-induced oxidative damage for all tested markers. The nephroprotective activity of green tea is mediated, at least in part, by the antioxidant effect of its constituents.
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Affiliation(s)
- Anouar Ben Saad
- Faculty of Sciences of Gafsa, 2112, University of Gafsa, Tunisia
| | - Sana Ncib
- Unit of Common Services, Faculty of Sciences Gafsa, 2112, University of Gafsa, Tunisia.,Environment and Energy Laboratory (UR14ES26), Faculty of Sciences of Gafsa, University of Gafsa, Gafsa, Tunisia
| | - Ilhem Rjeibi
- Faculty of Sciences of Gafsa, 2112, University of Gafsa, Tunisia
| | - Issam Saidi
- Faculty of Sciences of Gafsa, 2112, University of Gafsa, Tunisia
| | - Nacim Zouari
- Higher Institute of Applied Biology ISBAM Medenine 4119, University of Gabes, Tunisia
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Tokarova K, Vasicek J, Jurcik R, Balazi A, Kovacikova E, Kovacik A, Chrenek P, Capcarova M. Low dose exposure of patulin and protective effect of epicatechin on blood cells in vitro. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2019; 54:459-466. [PMID: 30795727 DOI: 10.1080/03601234.2019.1575673] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In the present study, we aimed to assess antioxidant status in erythrocytes in vitro after patulin (PAT) and epicatechin exposure by measuring antioxidant enzymes (superoxide-dismutase - SOD, glutathione peroxidase - GPx and catalase - CAT) and parameters associated with oxidative stress (malondialdehyde - MDA and ROS). We also investigated the effect of PAT on viability and count of lymphocytes and lymphocyte subpopulations in rabbit blood in vitro. Whole blood of rabbits was used for analysis of antioxidant changes in rabbit erythrocytes after epicatechin and PAT treatment (separately or in combination, at concentrations of 0.2; 2; 20; 200 µg mL-1 of epicatechin and 0.5; 5; 10 µg mL-1 of PAT). Whole blood of rabbits was also used for analysis of count and viability of lymphocytes after PAT treatment at concentrations of 10; 25 and 50 µg mL-1. Results from our experiment confirmed the ability of epicatechin to protect cells against oxidative stress and lipoperoxidation. Our findings indicate that mycotoxin PAT in low concentrations did not affect the activity of antioxidant enzymes in erythrocytes of rabbits significantly. Only slight non-significant changes in lymphocytes count after treatment with low doses of PAT in rabbit blood were observed.
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Affiliation(s)
- Katarina Tokarova
- a Department of Animal Physiology , Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra , 949 76 , Nitra , Slovak Republic
| | - Jaromir Vasicek
- b Research Institute for Animal Production Nitra, National Agricultural and Food Centre , 951 41 Luzianky , Slovak Republic
- c Department of Biochemistry and Biotechnology , Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra , 949 76 , Nitra , Slovak Republic
| | - Rastislav Jurcik
- b Research Institute for Animal Production Nitra, National Agricultural and Food Centre , 951 41 Luzianky , Slovak Republic
| | - Andrej Balazi
- b Research Institute for Animal Production Nitra, National Agricultural and Food Centre , 951 41 Luzianky , Slovak Republic
| | - Eva Kovacikova
- d Research Centre AgroBioTech Slovak University of Agriculture in Nitra , Nitra 949 76 , Slovak Republic
| | - Anton Kovacik
- a Department of Animal Physiology , Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra , 949 76 , Nitra , Slovak Republic
| | - Peter Chrenek
- b Research Institute for Animal Production Nitra, National Agricultural and Food Centre , 951 41 Luzianky , Slovak Republic
- c Department of Biochemistry and Biotechnology , Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra , 949 76 , Nitra , Slovak Republic
| | - Marcela Capcarova
- a Department of Animal Physiology , Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra , 949 76 , Nitra , Slovak Republic
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Zaidi SK, Ansari SA, Tabrez S, Naseer MI, Shahwan MJ, Banu N, Al-Qahtani MH. Antioxidant Potential of Solanum nigrum Aqueous Leaves Extract in Modulating Restraint Stress-Induced Changes in Rat's Liver. J Pharm Bioallied Sci 2019; 11:60-68. [PMID: 30906141 PMCID: PMC6394153 DOI: 10.4103/jpbs.jpbs_58_18] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Introduction: This study was carried out to evaluate the antioxidant potential of crude extract of Solanum nigrum leaves and its active constituents as treatment against restraint stress in rat’s liver. Methods: For this purpose, male albino Wistar rats were treated with crude extract of leaves and its alkaloid and flavonoid fractions both before and after 6 h of acute restraint stress. Prooxidant status of rat liver was assessed by determining the levels of thiobarbituric acid reactive substances, reduced glutathione, alkaline phosphatase, alanine transaminase, aspartate aminotransferase, and the activities of antioxidant enzymes superoxide dismutase (SOD), catalase (CAT), and glutathione S-transferase (GST). Results: Six hours of restraint stress generated oxidative stress in rat’s liver resulted in a significant rise in the level of the aforementioned liver enzymes. On the other hand, SOD, CAT, and GST enzymatic activities showed a significant decline in their level. The administration of crude leaves extract, both before and after stress exposure, significantly prevented the rise in the level of liver enzymes and reverted the activities of studied biochemical parameters toward their normal control values. However, the reversion was found to be more prominent in after-stress group. Conclusion: The aforementioned results highlight the significant antioxidant potential of S. nigrum extracts. On the basis of our study, we suggest the possible use of S. nigrum leaves extract as a nutritional supplement for combating oxidative stress induced damage.
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Affiliation(s)
- Syed K Zaidi
- Department of Molecular Biology, Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah, KSA
| | - Shakeel A Ansari
- Department of Molecular Biology, Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah, KSA
| | - Shams Tabrez
- Fundamental and Applied Biology Group, King Fahd Medical Research Center, King Abdulaziz University, Jeddah, KSA
| | - Muhammad I Naseer
- Department of Molecular Biology, Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah, KSA
| | - Moyad J Shahwan
- Department of Clinical Sciences, College of Pharmacy and Health Sciences, Ajman University, Ajman, UAE
| | - Naheed Banu
- College of Medical Rehabilitation, Qassim University, Buraydah, KSA
| | - Muhammad H Al-Qahtani
- Department of Molecular Biology, Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah, KSA
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7
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Gai HF, An JX, Qian XY, Wei YJ, Williams JP, Gao GL. Ovarian Damages Produced by Aerosolized Fine Particulate Matter (PM 2.5) Pollution in Mice: Possible Protective Medications and Mechanisms. Chin Med J (Engl) 2018; 130:1400-1410. [PMID: 28584201 PMCID: PMC5463468 DOI: 10.4103/0366-6999.207472] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Background: Ambient aerosol fine particulate matter (PM2.5) is associated with male reproductive toxicity in experiments and may have adverse effects in the female. However, studies evaluating the protective effects and precise mechanisms of aspirin, Vitamin C, Vitamin E, or ozone against toxic effects of PM2.5 are sparse. This study was conducted to investigate the possible protective effects and mechanisms of aspirin, Vitamin C, Vitamin E, or ozone on fertility in female mice treated with PM2.5. Methods: Eighty-four ICR mice were divided into six groups: control group, PM2.5 group, PM2.5 + aspirin group, PM2.5 + Vitamin C group, PM2.5 + Vitamin E group, and PM2.5 + ozone group. PM2.5 was given by intratracheal instillation every 2 days for 3 weeks. Aspirin, Vitamin C, and Vitamin E were given once a day by oral gavage for 3 weeks, and ozone was administered by intraperitoneal injection once a day for 3 weeks. The levels of anti-Müllerian hormone (AMH), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-α), and 8-hydroxy-2’-deoxyguanosine (8-OHdG) were measured using enzyme-linked immunosorbent assay. Western blotting analysis was used to analyze the expressions of Bcl-2, Bax, and caspase-3 in ovaries. Changes in histological structure were examined by light microscope and electron microscopy was used to detect ultramicrostructure. Results: The results demonstrated that PM2.5 decreased AMH levels (P < 0.001); however, aspirin (P < 0.001), Vitamin C (P < 0.001), Vitamin E (P = 0.001), and ozone (P = 0.002) alleviated the decrease. Changes of IL-6, TNF-α, 8-OHdG, Bax/Bcl-2, and caspase-3 in PM2.5 group were increased compared to control group (P < 0.001), while in PM2.5 + aspirin, PM2.5 + Vitamin C, PM2.5 + Vitamin E, and PM2.5 + ozone groups, they were statistically decreased compared to PM2.5 group (P < 0.001 or P < 0.05). Conclusions: PM2.5 cause the damage of ovaries, and aspirin, Vitamin C, Vitamin E, and ozone antagonizes the damage. The protective mechanism is probably due to its ability to blunt the inflammatory and oxidative stress caused by PM2.5, which subsequently suppressing the expression of apoptotic regulatory protein and reducing the incidence of ovary apoptosis.
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Affiliation(s)
- Hui-Fang Gai
- Department of Clinical Medicine, Weifang Medical University, Weifang, Shandong 261000; Department of Obstetrics and Gynecology, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing 100012, China
| | - Jian-Xiong An
- Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing 100012, China
| | - Xiao-Yan Qian
- Department of Anesthesiology, Pain Medicine and Critical Care Medicine, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing 100012, China
| | - Yong-Jie Wei
- Laboratory of Environmental Criteria and Risk Assessment and Environmental Standards Institute, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - John P Williams
- Department of Anesthesiology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213, USA
| | - Guo-Lan Gao
- Department of Clinical Medicine, Weifang Medical University, Weifang, Shandong 261000; Department of Obstetrics and Gynecology, Aviation General Hospital of China Medical University and Beijing Institute of Translational Medicine, Chinese Academy of Sciences, Beijing 100012, China
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8
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Shakeela Begum M, Saradamma B, Reddy VD, Padmavathi P, Maturu P, Ellutla NB, Thippannagari L, Varadacharyulu N. Influence of green tea consumption on cigarette smoking-induced biochemical changes in plasma and blood. CLINICAL NUTRITION EXPERIMENTAL 2017. [DOI: 10.1016/j.yclnex.2017.10.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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9
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Prasad S, Kaisar MA, Cucullo L. Unhealthy smokers: scopes for prophylactic intervention and clinical treatment. BMC Neurosci 2017; 18:70. [PMID: 28985714 PMCID: PMC5639581 DOI: 10.1186/s12868-017-0388-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 09/21/2017] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Globally, tobacco use causes approximately 6 million deaths per year, and predictions report that with current trends; more than 8 million deaths are expected annually by 2030. Cigarette smokings is currently accountable for more than 480,000 deaths each year in United States (US) and is the leading cause of preventable death in the US. On average, smokers die 10 years earlier than nonsmokers and if smoking continues at its current proportion among adolescents, one in every 13 Americans aged 17 years or younger is expected to die prematurely from a smoking-related illness. Even though there has been a marginal smoking decline of around 5% in recent years (2005 vs 2015), smokers still account for 15% of the US adult population. What is also concerning is that 41,000 out of 480,000 deaths results from secondhand smoke (SHS) exposure. Herein, we provide a detailed review of health complications and major pathological mechanisms including mutation, inflammation, oxidative stress, and hemodynamic and plasma protein changes associated with chronic smoking. Further, we discuss prophylactic interventions and associated benefits and provide a rationale for the scope of clinical treatment. CONCLUSIONS Considering these premises, it is evident that much detailed translational and clinical studies are needed. Factors such as the length of smoking cessation for ex-smokers, the level of smoke exposure in case of SHS, pre-established health conditions, genetics (and epigenetics modification caused by chronic smoking) are few of the criteria that need to be evaluated to begin assessing the prophylactic and/or therapeutic impact of treatments aimed at chronic and former smokers (especially early stage ex-smokers) including those frequently subjected to second hand tobacco smoke exposure. Herein, we provide a detailed review of health complications and major pathological mechanisms including mutation, inflammation, oxidative stress, and hemodynamic and plasma protein changes associated with chronic smoking. Further, we discuss about prophylactic interventions and associated benefits and provide a rationale and scope for clinical treatment.
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Affiliation(s)
- Shikha Prasad
- Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, 60611, USA
| | - Mohammad Abul Kaisar
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, 1300 S. Coulter Street, Amarillo, TX, 79106, USA
| | - Luca Cucullo
- Department of Pharmaceutical Sciences, School of Pharmacy, Texas Tech University Health Sciences Center, 1300 S. Coulter Street, Amarillo, TX, 79106, USA. .,Center for Blood Brain Barrier Research, Texas Tech University Health Sciences Center, Amarillo, TX, 79106, USA.
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10
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Paunović MG, Ognjanović BI, Matić MM, Štajn AŠ, Saičić ZS. Protective effects of quercetin and vitamin C against nicotine-induced toxicity in the blood of Wistar rats. Arh Hig Rada Toksikol 2017; 67:304-310. [PMID: 28033106 DOI: 10.1515/aiht-2016-67-2795] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Accepted: 11/01/2016] [Indexed: 12/26/2022] Open
Abstract
Nicotine is a potential inducer of oxidative stress, through which it can damage numerous biological molecules. The aim of our study was to investigate the prooxidative effects of nicotine and protective (additive or synergistic) effects of quercetin and vitamin C in the blood of experimental animals, to determine whether the combination of these antioxidants might be beneficial for clinical purposes. Wistar albino rats were receiving intraperitoneal nicotine injection (0.75 mg kg-1 per day) or saline (control group) or nicotine plus quercetin (40 mg kg-1 per day) and vitamin C (100 mg kg-1 per day) for three consecutive days. On day 4, we determined their blood lipid profile, liver enzymes, oxidative stress parameters, and antioxidative system parameters. Compared to untreated control, nicotine significantly increased total cholesterol, LDLcholesterol, triglycerides, liver enzymes (alanine transaminase, aspartate transaminase, and lactate dehydrogenase) and oxidative stress parameters (superoxide anion, hydrogen peroxide, and lipid peroxide) and decreased HDL-cholesterol, glutathione, and superoxide dismutase/catalase activity. Quercetin + vitamin C reversed these values significantly compared to the nicotine alone group. Our results confirm that nicotine has significant prooxidative effects that may disrupt the redox balance and show that the quercetin + vitamin C combination supports antioxidant defence mechanisms with strong haematoprotective activity against nicotine-induced toxicity. In practical terms, this means that a diet rich in vitamin C and quercetin could prevent nicotine-induced toxicity and could also be useful in the supportive care of people exposed to nicotine.
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Moore BF, Clark ML, Bachand A, Reynolds SJ, Nelson TL, Peel JL. Interactions Between Diet and Exposure to Secondhand Smoke on Glycated Hemoglobin Levels Among US Children: Results From NHANES 2007-2012. Nicotine Tob Res 2017; 19:845-851. [PMID: 27679605 DOI: 10.1093/ntr/ntw261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Accepted: 09/26/2016] [Indexed: 11/13/2022]
Abstract
Introduction Antioxidant-rich diets may lessen the adverse metabolic responses triggered by exposure to secondhand smoke (SHS), but no studies have investigated these potential interactions. Objective To examine the interaction between diet and exposure to SHS on glycated hemoglobin (HbA1c) levels among 2551 children, ages 12-19 years, who participated in the 2007-2012 National Health and Nutrition Examination Survey (NHANES). Methods Exposure to SHS was assessed by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanol (NNAL), cotinine, and self-report. Weighted linear regression models evaluated the cross-sectional association between exposure to SHS and HbA1c levels. Additive interaction was assessed by introducing product terms (with SHS) of individual nutrients (dietary fiber, eicosapentaenoic acid [EPA], docosahexaenoic acid [DHA], vitamin C, and vitamin E) to separate models. Results Over half of the children had NNAL or cotinine levels above the limit of detection (56% and 71%, respectively). The median HbA1c level was 5.2% (95% confidence interval: 5.17%, 5.23%). The interaction results suggest that the effects of exposure to SHS and certain dietary nutrients (EPA, DHA, vitamin C) on HbA1c levels may not be independent. For example, although there was only a slight difference in adjusted mean HbA1c levels across NNAL categories among children with high EPA intakes, the adjusted mean HbA1c level was 0.09% higher for high NNAL as compared to low NNAL among children with low EPA intakes. Conclusions Further research is needed to inform public health strategies for limiting increases in HbA1c levels among children. Messages may need to focus both on reducing exposure to SHS and improving diets to obtain the maximum benefit. Implications Our results suggest that the effects of exposure to SHS and diet on HbA1c levels may not be independent. For example, although there was little effect of exposure to SHS on HbA1c levels among children with high EPA intakes, high exposure to SHS was associated with an increase in HbA1c levels among children with low EPA intakes. Further research is necessary; however, based on these joint effects, strategies for limiting increases in HbA1c levels that focus both on reducing exposure to SHS and improving diets may achieve the largest public health benefits.
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Affiliation(s)
- Brianna F Moore
- Department of Epidemiology, Colorado School of Public Health (CSPH), Aurora, CO
| | - Maggie L Clark
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO
| | - Annette Bachand
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO
| | - Stephen J Reynolds
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO
| | - Tracy L Nelson
- Department of Health and Exercise Science, Colorado State University, Fort Collins, CO
| | - Jennifer L Peel
- Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO
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12
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Sengupta B, Sahihi M, Dehkhodaei M, Kelly D, Arany I. Differential roles of 3-Hydroxyflavone and 7-Hydroxyflavone against nicotine-induced oxidative stress in rat renal proximal tubule cells. PLoS One 2017; 12:e0179777. [PMID: 28640852 PMCID: PMC5480997 DOI: 10.1371/journal.pone.0179777] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 06/02/2017] [Indexed: 12/16/2022] Open
Abstract
Plant flavonoids are well known as antioxidants against oxidative stress induced by exposure to external pollutants. Nicotine (NIC) is one of those agents which increases renal oxidative stress, an important factor in the pathogenesis of renal epithelial injury in smokers. Although several studies had been conducted on flavonoids and oxidative stress, the mechanism of the protective pathways are not fully understood. Here, we present studies on antioxidant properties of two mono-hydroxyflavone isomers, 3-hydroxyflanove (3HF)- and 7-hydroxyflavone (7HF), against nicotine-associated oxidative stress and injury in cultured renal proximal tubule cells and correlate their antioxidant properties with their chemical structure. Our data clearly demonstrates, for the first time, that while both 3HF and 7HF protect renal cells from NIC-associated cytotoxicity, the mechanism of their action is different: 3HF elicits protective activity via the PKA/CREB/MnSOD pathway while 7HF does so via the ERK/Nrf2/HO-1 pathway. Molecular docking and dynamics simulations with two major signaling pathway proteins showed significant differences in the binding energies of 3HF (-5.67 and -7.39 kcal.mol-1) compared to 7HF (-5.41 and -8.55 kcal.mol-1) in the matrices of CREB and Keap1-Nrf2 proteins respectively, which corroborate with the observed differences in their protective properties in the renal cells. The implications of this novel explorative study is likely to promote the understanding of the mechanisms of the antioxidative functions of different flavones.
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Affiliation(s)
- Bidisha Sengupta
- Department of Chemistry, Tougaloo College, Tougaloo, Mississippi, United States of America
| | - Mehdi Sahihi
- Department of Chemistry, University of Isfahan, Isfahan, Iran
| | | | - Darrian Kelly
- Department of Chemistry, Tougaloo College, Tougaloo, Mississippi, United States of America
| | - Istvan Arany
- Department of Pediatrics, University of Mississippi Medical Center, Jackson, Mississippi, United States of America
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Camellia sinensis Prevents Perinatal Nicotine-Induced Neurobehavioral Alterations, Tissue Injury, and Oxidative Stress in Male and Female Mice Newborns. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2017; 2017:5985219. [PMID: 28588748 PMCID: PMC5447281 DOI: 10.1155/2017/5985219] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 03/27/2017] [Indexed: 12/31/2022]
Abstract
Nicotine exposure during pregnancy induces oxidative stress and leads to behavioral alterations in early childhood and young adulthood. The current study aimed to investigate the possible protective effects of green tea (Camellia sinensis) against perinatal nicotine-induced behavioral alterations and oxidative stress in mice newborns. Pregnant mice received 50 mg/kg C. sinensis on gestational day 1 (PD1) to postnatal day 15 (D15) and were subcutaneously injected with 0.25 mg/kg nicotine from PD12 to D15. Nicotine-exposed newborns showed significant delay in eye opening and hair appearance and declined body weight at birth and at D21. Nicotine induced neuromotor alterations in both male and female newborns evidenced by the suppressed righting, rotating, and cliff avoidance reflexes. Nicotine-exposed newborns exhibited declined memory, learning, and equilibrium capabilities, as well as marked anxiety behavior. C. sinensis significantly improved the physical development, neuromotor maturation, and behavioral performance in nicotine-exposed male and female newborns. In addition, C. sinensis prevented nicotine-induced tissue injury and lipid peroxidation and enhanced antioxidant defenses in the cerebellum and medulla oblongata of male and female newborns. In conclusion, this study shows that C. sinensis confers protective effects against perinatal nicotine-induced neurobehavioral alterations, tissue injury, and oxidative stress in mice newborns.
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Nathiga Nambi KS, Abdul Majeed S, Taju G, Sivasubbu S, Sarath Babu V, Sahul Hameed AS. Effects of nicotine on zebrafish: A comparative response between a newly established gill cell line and whole gills. Comp Biochem Physiol C Toxicol Pharmacol 2017; 195:68-77. [PMID: 28257922 DOI: 10.1016/j.cbpc.2017.02.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 02/15/2017] [Accepted: 02/23/2017] [Indexed: 12/23/2022]
Abstract
A novel cell line, Danio rerio gill (DrG), derived from the gill tissue of zebrafish, was established and characterized. The cells were able to grow at a wide range of temperatures from 25°C to 32°C in Leibovitz's L-15 medium. The DrG cell line consists of epithelial-like cells with a diameter of 18-22μm. The cell line was characterized by mitochondrial 12S rRNA gene. Acute toxicity tests were conducted on D. rerio by exposing them to nicotine for 96h under static conditions. In vitro cytotoxicity of nicotine was assessed in DrG cell line using multiple endpoints such as 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide (MTT), Neutral Red assay, Alamar Blue assay and Coomassie Blue protein assay. Linear correlations between each in vitro cytotoxicity assay and the in vivo mortality data were highly significant. Nicotine induced intracellular reactive oxygen species generation in DrG cell line in a concentration dependent manner. DrG cell line and zebrafish exposed to nicotine significantly increased the elevation of lipid peroxidation (LPO) while depletion of reduced glutathione (GSH), manganese superoxide dismutase (MnSOD), catalase (CAT), glutathione S-transferase (GST) and glutathione peroxidise(GPx1a) was observed. In nicotine treated fish and cells a negative correlation between reduced glutathione and LPO was observed. In addition, the production of ROS and the resulting oxidative stress resulted in increased expression of apoptosis related genes p53 and cas3.Collectively, our result suggests that nicotine has the potential to induce reactive oxygen species (ROS) production, oxidative stress and apoptosis in DrG cell line and zebrafish.
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Affiliation(s)
- K S Nathiga Nambi
- Aquatic Animal Health Laboratory (OIE Reference for WTD), PG & Research Department of Zoology, C. Abdul Hakeem College, Melvisharam - 632 509, Vellore District, Tamil Nadu, India; Institute of Genomics and Integrative Biology (IGIB), New Delhi, India
| | - S Abdul Majeed
- Aquatic Animal Health Laboratory (OIE Reference for WTD), PG & Research Department of Zoology, C. Abdul Hakeem College, Melvisharam - 632 509, Vellore District, Tamil Nadu, India
| | - G Taju
- Aquatic Animal Health Laboratory (OIE Reference for WTD), PG & Research Department of Zoology, C. Abdul Hakeem College, Melvisharam - 632 509, Vellore District, Tamil Nadu, India
| | - Sridhar Sivasubbu
- Institute of Genomics and Integrative Biology (IGIB), New Delhi, India
| | - V Sarath Babu
- Aquatic Animal Health Laboratory (OIE Reference for WTD), PG & Research Department of Zoology, C. Abdul Hakeem College, Melvisharam - 632 509, Vellore District, Tamil Nadu, India
| | - A S Sahul Hameed
- Aquatic Animal Health Laboratory (OIE Reference for WTD), PG & Research Department of Zoology, C. Abdul Hakeem College, Melvisharam - 632 509, Vellore District, Tamil Nadu, India.
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15
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Al-Basher G, Ajarem JS, Allam AA, Mahmoud AM. Green Tea Protects Against Perinatal Nicotine-induced Histological, Biochemical and Hematological Alterations in Mice Offspring. INT J PHARMACOL 2017. [DOI: 10.3923/ijp.2017.109.121] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Zbynovska K, Petruska P, Kalafova A, Ondruska L, Jurcik R, Chrastinova L, Tusimova E, Kovacik A, Capcarova M. Antioxidant status of rabbits after treatment with epicatechin and patulin. Biologia (Bratisl) 2016. [DOI: 10.1515/biolog-2016-0098] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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17
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Miranda-Spooner M, Paccola CC, Neves FMO, de Oliva SU, Miraglia S. Late reproductive analysis in rat male offspring exposed to nicotine during pregnancy and lactation. Andrology 2016; 4:218-31. [DOI: 10.1111/andr.12100] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 07/20/2015] [Accepted: 07/31/2015] [Indexed: 12/30/2022]
Affiliation(s)
- M. Miranda-Spooner
- Laboratory of Developmental Biology; Department of Morphology and Genetics; Federal University of Sao Paulo - UNIFESP; Sao Paulo Brazil
| | - C. C. Paccola
- Laboratory of Developmental Biology; Department of Morphology and Genetics; Federal University of Sao Paulo - UNIFESP; Sao Paulo Brazil
| | - F. M. O. Neves
- Laboratory of Developmental Biology; Department of Morphology and Genetics; Federal University of Sao Paulo - UNIFESP; Sao Paulo Brazil
| | - S. U. de Oliva
- Laboratory of Developmental Biology; Department of Morphology and Genetics; Federal University of Sao Paulo - UNIFESP; Sao Paulo Brazil
| | - S. M. Miraglia
- Laboratory of Developmental Biology; Department of Morphology and Genetics; Federal University of Sao Paulo - UNIFESP; Sao Paulo Brazil
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Naik P, Cucullo L. Pathobiology of tobacco smoking and neurovascular disorders: untied strings and alternative products. Fluids Barriers CNS 2015; 12:25. [PMID: 26520792 PMCID: PMC4628383 DOI: 10.1186/s12987-015-0022-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 10/20/2015] [Indexed: 12/27/2022] Open
Abstract
Tobacco smoke (TS) is the leading cause of preventable deaths worldwide. In addition to a host of well characterized diseases including chronic obstructive pulmonary disease, oral and peripheral cancers and cardiovascular complications, epidemiological evidence suggests that chronic smokers are at equal risk to develop neurological and neurovascular complications such as multiple sclerosis, Alzheimer's disease, stroke, vascular dementia and small vessel ischemic disease (SVID). Unfortunately, few direct neurotoxicology studies of tobacco smoking and its pathogenic pathways have been produced so far. A major link between TS and CNS disorders is the blood-brain barrier (BBB). In this review article, we summarize the current understanding of the toxicological impact of TS on BBB physiology and function and major compensatory mechanisms such as nrf2- ARE signaling and anti-inflammatory pathways activated by TS. In the same context, we discuss the controversial role of antioxidant supplementation as a prophylactic and/or therapeutic approach in delaying or decreasing the disease complications in smokers. Further, we cover a number of toxicological studies associated with "reduced exposure" cigarette products including electronic cigarettes. Finally, we provide insights on possible avenues for future research including mechanistic studies using direct inhalation rodent models.
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Affiliation(s)
- Pooja Naik
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, School of Pharmacy, 1300 S. Coulter Street, Amarillo, TX, 79106, USA.
| | - Luca Cucullo
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, School of Pharmacy, 1300 S. Coulter Street, Amarillo, TX, 79106, USA. .,Center for Blood Brain Barrier Research, Texas Tech University Health Sciences Center, Amarillo, TX, 79106, USA.
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Kaisar MA, Prasad S, Cucullo L. Protecting the BBB endothelium against cigarette smoke-induced oxidative stress using popular antioxidants: Are they really beneficial? Brain Res 2015; 1627:90-100. [PMID: 26410779 DOI: 10.1016/j.brainres.2015.09.018] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Revised: 09/14/2015] [Accepted: 09/15/2015] [Indexed: 01/23/2023]
Abstract
Blood Brain Barrier (BBB) exposed to realistic concentrations (comparable to a chronic heavy smoker) of Cigarette Smoke Extract (CSE) triggers a strong endothelial inflammatory response which can lead to the onset of neurological disorders. The involvement of Reactive Oxygen Species (ROS) in this inflammatory cascade is evident from the up-regulation of nuclear factor erythroid 2 related factor 2 (Nrf-2), a transcription factor involved in anti-oxidant response signaling in CSE exposed endothelial cells. We have shown that pre-treatment with α-tocopherol and/or ascorbic acid is highly protective for the BBB, thus suggesting that, prophylactic administration of antioxidants can reduce CSE and/or inflammatory-dependent BBB damage. We have assessed and ranked the protective effects of 5 popular OTC antioxidants (Coenzyme Q10, melatonin, glutathione, lipoic acid and resveratrol) against CSE-induced BBB endothelial damage using hCMEC/D3 cells. The analysis of pro-inflammatory cytokines release by ELISA revealed that resveratrol, lipoic acid melatonin and Co-Q10 inhibited the BBB endothelial release of pro-inflammatory cytokines IL-6 and IL-8, reduced (not Co-Q10) CSE-induced up-regulation of Platelet Cell Adhesion Molecule-1 (PECAM-1), Vascular Cell Adhesion Molecule-1 (VCAM-1) & E-selectin and inhibited monocytes-endothelial cell adhesion. The anti-inflammatory effects correlated with the anti-oxidative protection endowed by these compounds as evidenced by upregulation of NADPH: Quinone Oxidoreductase 1 (NQO1) and reduced cellular oxidative stress. CSE-induced release of Vascular Endothelial Growth Factor (VEGF) was inhibited by all tested compounds although the effect was not strictly dose-dependent. Further in vivo studies are required to validate our results and expand our current study to include combinatorial treatments.
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Affiliation(s)
- Mohammad Abul Kaisar
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79106, United States
| | - Shikha Prasad
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79106, United States
| | - Luca Cucullo
- Department of Pharmaceutical Sciences, Texas Tech University Health Sciences Center, Amarillo, TX 79106, United States; Center for Blood-Brain Barrier Research, Texas Tech University Health Sciences Center, Amarillo, TX 79106, United States.
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Nicotine detoxification of rutin, quercitrin, and chlorogenic acid isolated from Houttuynia cordata by reducing reactive oxygen species and inducing conversion from nicotine to cotinine. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s13765-014-4182-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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21
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Tinti F, Soory M. Oxidative actions of hydrogen peroxide in human gingival and oral periosteal fibroblasts: responses to glutathione and nicotine, relevant to healing in a redox environment. Redox Biol 2013; 2:36-43. [PMID: 24371803 PMCID: PMC3871294 DOI: 10.1016/j.redox.2013.11.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2013] [Revised: 11/26/2013] [Accepted: 11/29/2013] [Indexed: 12/22/2022] Open
Abstract
Background This study aims to validate pro-oxidant actions of nicotine (N), using hydrogen peroxide (H2O2) and the antioxidant glutathione (G) in an in vitro model of human gingival fibroblasts (HGF) and human oral periosteal fibroblasts (HPF); radiolabelled androgens are used as biomarkers of redox status. Oxidative stress is an important mediator of inflammatory repair. The androgen metabolite 5α-dihydrotestosterone (DHT) is an effective biomarker of oxidative stress and healing. Methods 6 Cell-lines of HGF and HPF established in confluent monolayer culture were incubated in Eagle's MEM using 14C-testosterone and 14C-4-androstendione as substrate; in conjunction with effective concentrations of N, G and H2O2 established at N250, G3 μg/ml and 3%H2O2 w/w, 0.5 μl/ml. Combinations of H2O2G and H2O2GN were used in order to compare the oxidative effects of N/H2O2 and their responses to glutathione. At 24 h, the medium was solvent extracted, evaporated to dryness and subjected to TLC in a benzene/acetone solvent system 4:1 v/v for the separation of metabolites. The separated metabolites were quantified using a radioisotope scanner. Results The mean trends of 6 cell-lines for both substrates and each cell type demonstrated that the yield of the main metabolite DHT was significantly reduced by N and H2O2 alone (2-fold, n=6; p<0.01). The inhibition caused by H2O2 was overcome by the antioxidant glutathione in the combination H2O2G, to values similar to those of controls (n=6; p<0.01). It is relevant that when N was added to this neutralized combination, the decrease in yields of DHT triggered by N were comparable to those induced by H2O2; and retaining the positive effect of G. Conclusion Oxidative stress mediated by H2O2 was overcome by glutathione and recurred when nicotine was added, suggestive of a pro- oxidant role for nicotine. Androgen biomarkers are a sensitive index of oxidative stress which affects wound healing. DHT is an effective redox marker in HGF and oral periosteal fibroblasts in vitro. Both nicotine and H2O2 reduced yields of DHT, indicative of induced oxidative stress. Nicotine has oxidative effects that are comparable to those of H2O2 mediated by AR. Effects of nicotine and H2O2 were reduced by glutathione in HGF and HPF cultures. Redox status is relevant to androgen receptor-mediated inflammatory wound healing.
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Affiliation(s)
- Federico Tinti
- King's College London Dental Institute, Guy's Dental Hospital, London SE1 9RT, UK
| | - Mena Soory
- King's College London Dental Institute, Guy's Dental Hospital, London SE1 9RT, UK
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