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Toz H, Değer Y. The Effect of Chitosan on the Erythrocyte Antioxidant Potential of Lead Toxicity-Induced Rats. Biol Trace Elem Res 2018; 184:114-118. [PMID: 28971372 DOI: 10.1007/s12011-017-1164-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 09/21/2017] [Indexed: 10/18/2022]
Abstract
In the present study, the effects of chitosan on erythrocyte malondialdehyde (MDA) and glutathione (GSH) levels and glutathione peroxidase (GSH-Px), glutathione reductase (GR), and glucose-6-phosphate dehydrogenase (G6PDH) enzyme activities in lead toxicity-induced rats were investigated. Twenty-eight male Wistar albino rats were divided into four groups of control (C), lead group (Pb group), lead + chitosan group (Pb + CS group), and chitosan group (CS group). Lead groups were administered 50 mg/kg lead acetate intraperitoneally (ip) for 5 days and chitosan groups were administered 200 mg/kg chitosan for 28 days via gavage. At the end of the study, lead levels were measured in the blood; MDA and GSH levels and GPx, GR, and G6PDH activities were measured in the erythrocyte. It was determined that, in parallel with the increase of full blood lead levels in the Pb group, erythrocyte MDA levels increased significantly, while GSH levels and GSH-Px, GR, and G6PDH activities decreased when compared to those in the C and CS groups (p ˂ 0.05). There was a statistically significant decrease in lead and MDA levels and GSH level and GSH-Px activity increased (p ˂ 0.05) in the Pb + CS group, where chitosan was administered as a protective agent in addition to lead, when compared to the Pb group. There were no differences between the Pb + CS group and the other three groups based on GR and G6PDH activities (p ˃ 0.05). No statistically significant difference was found between the C and CS groups based on the parameters of analysis (p ˃ 0.05). The findings of the present study demonstrated that lead increased oxidative stress by increasing free radical production in erythrocytes, and chitosan was effective in removing the lead from the circulation and enforced the antioxidant defense system.
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Affiliation(s)
- Hasan Toz
- Biochemistry Department, Faculty of Veterinary Medicine, University of Yuzuncu Yil, Yuzuncu Yil, 65080, Van, Turkey
| | - Yeter Değer
- Biochemistry Department, Faculty of Veterinary Medicine, University of Yuzuncu Yil, Yuzuncu Yil, 65080, Van, Turkey.
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Dewanjee S, Dua TK, Khanra R, Das S, Barma S, Joardar S, Bhattacharjee N, Zia-Ul-Haq M, Jaafar HZE. Water Spinach, Ipomoea aquatic (Convolvulaceae), Ameliorates Lead Toxicity by Inhibiting Oxidative Stress and Apoptosis. PLoS One 2015; 10:e0139831. [PMID: 26473485 PMCID: PMC4608788 DOI: 10.1371/journal.pone.0139831] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 09/17/2015] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND Ipomoea aquatica (Convolvulaceae), an aquatic edible plant, is traditionally used against heavy metal toxicity in India. The current study intended to explore the protective role of edible (aqueous) extract of I. aquatica (AEIA) against experimentally induced Pb-intoxication. METHODS The cytoprotective role of AEIA was measured on mouse hepatocytes by cell viability assay followed by Hoechst staining and flow cytometric assay. The effect on ROS production, lipid peroxidation, protein carbonylation, intracellular redox status were measured after incubating the hepatocytes with Pb-acetate (6.8 μM) along with AEIA (400 μg/ml). The effects on the expressions of apoptotic signal proteins were estimated by western blotting. The protective role of AEIA was measured by in vivo assay in mice. Haematological, serum biochemical, tissue redox status, Pb bioaccumulation and histological parameters were evaluated to estimate the protective role of AEIA (100 mg/kg) against Pb-acetate (5 mg/kg) intoxication. RESULTS Pb-acetate treated hepatocytes showed a gradual reduction of cell viability dose-dependently with an IC50 value of 6.8 μM. Pb-acetate treated hepatocytes exhibited significantly enhanced levels (p < 0.01) of ROS production, lipid peroxidation, protein carbonylation with concomitant depletion (p < 0.01) of antioxidant enzymes and GSH. However, AEIA treatment could significantly restore the aforementioned parameters in murine hepatocytes near to normalcy. Besides, AEIA significantly reversed (p < 0.05-0.01) the alterations of transcription levels of apoptotic proteins viz. Bcl 2, Bad, Cyt C, Apaf-1, cleaved caspases [caspase 3, caspase 8 and caspase 9], Fas and Bid. In in vivo bioassay, Pb-acetate treatment caused significantly high intracellular Pb burden and oxidative pressure in the kidney, liver, heart, brain and testes in mice. In addition, the haematological and serum biochemical factors were changed significantly in Pb-acetate-treated animals. AEIA treatment restored significantly the evaluated-parameters to the near-normal position. CONCLUSION The extract may offer the protective effect via counteracting with Pb mediated oxidative stress and/or promoting the elimination of Pb by chelating. The presence of substantial quantities of flavonoids, phenolics and saponins would be responsible for the overall protective effect.
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Affiliation(s)
- Saikat Dewanjee
- Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Tarun K. Dua
- Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Ritu Khanra
- Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Shilpa Das
- Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Sujata Barma
- Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Swarnalata Joardar
- Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - Niloy Bhattacharjee
- Advanced Pharmacognosy Research Laboratory, Department of Pharmaceutical Technology, Jadavpur University, Kolkata, 700032, India
| | - M. Zia-Ul-Haq
- Department of Pharmacognosy, University of Karachi, Karachi, 75270, Pakistan
| | - Hawa Z. E. Jaafar
- Department of Crop Science, Faculty of Agriculture, Universiti Putra, Selangor, 43400, Malaysia
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Rainio MJ, Eeva T, Lilley T, Stauffer J, Ruuskanen S. Effects of early-life lead exposure on oxidative status and phagocytosis activity in great tits (Parus major). Comp Biochem Physiol C Toxicol Pharmacol 2015; 167:24-34. [PMID: 25182672 DOI: 10.1016/j.cbpc.2014.08.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 08/14/2014] [Accepted: 08/14/2014] [Indexed: 01/25/2023]
Abstract
Lead is a highly poisonous metal with a very long half-life, distributing throughout the body in blood and accumulating primarily in bones and kidney. We studied the short and long-term effects of early-life lead exposure on antioxidant defense and phagocytosis activity in a small passerine bird, the great tit (Parus major) by manipulating dietary lead levels of the nestlings. We had three experimental groups, exposed to environmentally relevant lead concentrations; high (4 μg/g body mass), low (1 μg/g body mass) and control (0 μg/g body mass) group. As a comparison, a great tit population breeding in the vicinity of a metal smelter was included to the experimental set-up. We measured glutathione, the ratio of reduced and oxidized glutathione, and the antioxidant enzymes: glutathione peroxidase, glutathione-S-transferase, catalase and superoxide dismutase together with protein carbonylation and phagocytosis activity to study the effects of lead on the oxidative status and immune function of birds. We found differences in enzyme activities between the study groups, but in most cases the smelter group differed from the other groups. Despite the differences observed in antioxidant enzymes, our results indicate only minor short-term effects of lead exposure on oxidative status, since either glutathione ratio or protein carbonylation were not affected by lead. Phagocytosis activity was not linked to higher lead concentrations either. Interestingly, protein carbonylation was positively associated with enzyme activities and glutathione level. Our results did not show major long-term effects of lead on the oxidative status of great tits.
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Affiliation(s)
- Miia J Rainio
- Department of Biology, University of Turku, FI-20014 Turku, Finland.
| | - Tapio Eeva
- Department of Biology, University of Turku, FI-20014 Turku, Finland.
| | - Thomas Lilley
- Department of Biology, University of Turku, FI-20014 Turku, Finland.
| | - Janina Stauffer
- Department of Biology, University of Turku, FI-20014 Turku, Finland.
| | - Suvi Ruuskanen
- Department of Biology, University of Turku, FI-20014 Turku, Finland; Department of Animal Ecology, Netherlands Institute of Ecology (NIOO-KNAW), Wageningen, Netherlands.
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Tian Y, Liu H, Wang Q, Zhou J, Tang X. Acute and chronic toxic effects of Pb²⁺ on polychaete Perinereis aibuhitensis: morphological changes and responses of the antioxidant system. J Environ Sci (China) 2014; 26:1681-1688. [PMID: 25108724 DOI: 10.1016/j.jes.2014.06.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Revised: 12/02/2013] [Accepted: 12/18/2013] [Indexed: 06/03/2023]
Abstract
Perinereis aibuhitensis was used to assess adverse biological effects caused by acute and chronic Pb²⁺ exposure in artificial seawater under controlled laboratory conditions. In 96-hr acute toxicity experiments, the morphological changes showed a positive time/dose-dependent tendency, and the 96-hr LC₅₀ value of Pb²⁺ was 686.41 mg/L. The responses of enzymatic and non-enzymatic antioxidants in tissues including catalase (CAT), peroxidase (POD), superoxide dismutase (SOD), glutathione peroxidase (GSH-PX), malondialdehyde (MDA) and the content of total soluble protein (TSP), were investigated on days 1, 4, 7 and 10 after Pb²⁺ exposure under chronic toxicity testing. Results showed that the activation of the antioxidant system in P. aibuhitensis depended on the Pb²⁺ concentration and the duration of exposure time. Specifically, POD and SOD activities were induced on the first day of the exposure and decreased to the control level on day 10 after exposure. Therefore, these two indexes could be used to indicate oxidative stress associated with P. aibuhitensis exposure to Pb²⁺.
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Affiliation(s)
- Yulu Tian
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
| | - Hongjun Liu
- Marine Biology Institute of Shangdong Province, Qingdao 266002, China
| | - Qixiang Wang
- Marine Biology Institute of Shangdong Province, Qingdao 266002, China
| | - Jian Zhou
- Marine Biology Institute of Shangdong Province, Qingdao 266002, China
| | - Xuexi Tang
- College of Marine Life Sciences, Ocean University of China, Qingdao 266003, China.
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Budak H, Gonul N, Ceylan H, Kocpinar EF. Impact of long term Fe³⁺ toxicity on expression of glutathione system in rat liver. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2014; 37:365-370. [PMID: 24388910 DOI: 10.1016/j.etap.2013.12.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2013] [Revised: 12/09/2013] [Accepted: 12/13/2013] [Indexed: 06/03/2023]
Abstract
The free radicals within the body, produced by metabolic activities or derived from environmental sources are relatively related to hepatoxicity. Since heavy metals including iron have the ability to produce free radicals, the liver glutathione system neutralizes them to protect cells against any damage. The objective of this study is to indicate the toxic effects of iron on the glutathione system at the enzymatic and molecular level. Thus, any possible correlation between enzymatic and molecular levels can be determined. According to our results, while mRNA expression of glutathione reductase (Gsr) and glutathione S-transferases (Gsta5) genes were not affected by long-term exposure to various concentrations of iron (Fe(3+)), transcription level of glutathione peroxidase (Gpx2) was influenced in the presence of toxic iron. Whereas the enzyme activites of GSR (GR), GPX and GST were significantly affected in rat liver.
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Affiliation(s)
- Harun Budak
- Ataturk University, Science Faculty, Department of Molecular Biology and Genetics, 25240 Erzurum, Turkey.
| | - Nurdan Gonul
- Ataturk University, Science Faculty, Department of Molecular Biology and Genetics, 25240 Erzurum, Turkey
| | - Hamid Ceylan
- Ataturk University, Science Faculty, Department of Molecular Biology and Genetics, 25240 Erzurum, Turkey
| | - Enver Fehim Kocpinar
- Ataturk University, Science Faculty, Department of Chemistry, 25240 Erzurum, Turkey
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Chandrasekaran VRM, Hsu DZ, Liu MY. Beneficial effect of sesame oil on heavy metal toxicity. JPEN J Parenter Enteral Nutr 2013; 38:179-85. [PMID: 23744838 DOI: 10.1177/0148607113490960] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Heavy metals become toxic when they are not metabolized by the body and accumulate in the soft tissue. Chelation therapy is mainly for the management of heavy metal-induced toxicity; however, it usually causes adverse effects or completely blocks the vital function of the particular metal chelated. Much attention has been paid to the development of chelating agents from natural sources to counteract lead- and iron-induced hepatic and renal damage. Sesame oil (a natural edible oil) and sesamol (an active antioxidant) are potently beneficial for treating lead- and iron-induced hepatic and renal toxicity and have no adverse effects. Sesame oil and sesamol significantly inhibit iron-induced lipid peroxidation by inhibiting the xanthine oxidase, nitric oxide, superoxide anion, and hydroxyl radical generation. In addition, sesame oil is a potent inhibitor of proinflammatory mediators, and it attenuates lead-induced hepatic damage by inhibiting nitric oxide, tumor necrosis factor-α, and interleukin-1β levels. Because metal chelating therapy is associated with adverse effects, treating heavy metal toxicity in addition with sesame oil and sesamol may be better alternatives. This review deals with the possible use and beneficial effects of sesame oil and sesamol during heavy metal toxicity treatment.
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Tvrdá E, Kňažická Z, Lukáčová J, Schneidgenová M, Goc Z, Greń A, Szabó C, Massányi P, Lukáč N. The impact of lead and cadmium on selected motility, prooxidant and antioxidant parameters of bovine seminal plasma and spermatozoa. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2013; 48:1292-1300. [PMID: 23647120 DOI: 10.1080/10934529.2013.777243] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The aim of this study was to investigate the effects of lead (Pb) and cadmium (Cd) content on basic motility characteristics (motility-MOT, progressive motility-PROG) as well as selected markers of the prooxidant-antioxidant balance (catalase-CAT, glutathione-GSH, malondialdehyde-MDA) in bovine seminal plasma and spermatozoa. Twenty five semen samples were collected from breeding bulls and used in the study. Motility analysis was carried out using the Computer Assisted Sperm Analysis (CASA) system. The samples were centrifuged, fractions of seminal plasma and spermatozoa were separated, lysates were prepared from the sperm cell fractions. Pb and Cd concentrations were determined by the voltametric method (ASV), antioxidants and MDA were analyzed by UV/Vis spectrophotometry. The analysis showed that the average concentration of Pb in the seminal plasma was 0.23 ± 0.02 μg/mL, while its amount in the sperm cells was significantly higher (0.41 ± 0.07 μg/mL; P < 0.05). The average Cd content in bovine seminal fractions was similar and non-significant: 0.09 ± 0.01 μg/mL in the seminal plasma and 0.11 ± 0.01 μg/mL in spermatozoa (P > 0.05). The correlation analysis revealed that both heavy metals were significantly negatively correlated with MOT and PROG (P < 0.05; P < 0.01; P < 0.001), CAT (P < 0.05; P < 0.01) as well as GSH (P < 0.05; P < 0.01) but significantly positively associated with MDA as the marker of lipid peroxidation (P < 0.05; P < 0.01). Moreover the samples were categorized in three quality groups (Excellent, Good, Moderate) according to their motility values. The lowest Pb, Cd and MDA concentrations but the best antioxidant characteristics were found in samples of the best quality, moderate quality samples exhibited the highest Pb, Cd and MDA content together with the worst antioxidant capacity. This study demonstrates that Pb and Cd are serious toxic elements, which are able to increase the risk of seminal oxidative stress development and a subsequent decrease of male fertility.
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Affiliation(s)
- Eva Tvrdá
- Department of Animal Physiology, Slovak University of Agriculture, Nitra, Slovakia.
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Liu CM, Ma JQ, Sun YZ. Puerarin protects the rat liver against oxidative stress-mediated DNA damage and apoptosis induced by lead. ACTA ACUST UNITED AC 2012; 64:575-82. [DOI: 10.1016/j.etp.2010.11.016] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Revised: 11/09/2010] [Accepted: 11/17/2010] [Indexed: 01/13/2023]
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Wang J, Yang Z, Lin L, Zhao Z, Liu Z, Liu X. Protective effect of naringenin against lead-induced oxidative stress in rats. Biol Trace Elem Res 2012; 146:354-9. [PMID: 22109809 DOI: 10.1007/s12011-011-9268-6] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Accepted: 11/08/2011] [Indexed: 02/07/2023]
Abstract
Oxidative stress is thought to be involved in lead-induced toxicity. The aim of this study was to investigate the possible protective role of naringenin on lead-induced oxidative stress in the liver and kidney of rats. In the present investigation, lead acetate (500 mg Pb/L) was administered orally for 8 weeks to induce hepatotoxicity and nephrotoxicity. The levels of hepatic and renal markers such as alanine aminotransferase, aspartate aminotransferase, urea, uric acid, and creatinine were significantly (P < 0.05) increased following lead acetate administration. Lead-induced oxidative stress in liver and kidney tissue was indicated by a significant (P < 0.05) increase in the level of maleic dialdehyde and decreased levels of reduced glutathione, superoxide dismutase, catalase, and glutathione peroxidase. Naringenin markedly attenuated lead-induced biochemical alterations in serum, liver, and kidney tissues (P < 0.05). The present study suggests that naringenin shows antioxidant activity and plays a protective role against lead-induced oxidative damage in the liver and kidney of rats.
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Affiliation(s)
- Jicang Wang
- College of Animal Science and Technology, Henan University of Science and Technology, No.70, Tianjin Road, 471003, Luoyang, People's Republic of China.
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Liu CM, Ma JQ, Sun YZ. Protective role of puerarin on lead-induced alterations of the hepatic glutathione antioxidant system and hyperlipidemia in rats. Food Chem Toxicol 2011; 49:3119-27. [PMID: 22001170 DOI: 10.1016/j.fct.2011.09.007] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2011] [Revised: 09/06/2011] [Accepted: 09/07/2011] [Indexed: 11/16/2022]
Abstract
Puerarin (PU), a natural flavonoid, has been reported to have many benefits and medicinal properties. The aim of the present study was to investigate the effects of puerarin on hepatic oxidative stress and hyperlipidemia in rats exposed to lead. Our data showed that puerarin significantly prevented lead-induced hepatotoxicity, indicated by both diagnostic indicators of liver damage (serum aminotransferase levels) and histopathological analysis. Moreover, lead-induced profound elevation of ROS production and oxidative stress, as evidenced by increasing of lipid peroxidation level, reducing of GPx, GST, GR and GCL activities and depleting of intracellular reduced GSH level in liver, were suppressed by treatment with puerarin. Furthermore, the increase of serum cholesterol, triglycerides and LDL induced by lead was effectively suppressed by puerarin. The HDL level in the lead treatment rats was also increased by puerarin. Western blot analysis showed that puerarin remarkably inhibited hyperlipidemia by regulating the expression of cholesterol 7a-hydroxylase (CYP7A1), 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) and low-density lipoprotein receptor (LDL-R) in liver of lead treated rats. Altogether, these results suggest that puerarin could protect the lead-induced liver injury and hyperlipidemia by reducing ROS production, renewing the activities of antioxidant enzymes and influencing expression of hepatic lipid biosynthesis and metabolism genes.
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Affiliation(s)
- Chan-Min Liu
- School of Life Science, Xuzhou Normal University, No. 101, Shanghai Road, Tangshan New Area, Xuzhou City 221116, Jiangsu Province, PR China.
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Patra RC, Rautray AK, Swarup D. Oxidative stress in lead and cadmium toxicity and its amelioration. Vet Med Int 2011; 2011:457327. [PMID: 21547215 PMCID: PMC3087445 DOI: 10.4061/2011/457327] [Citation(s) in RCA: 264] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Accepted: 01/21/2011] [Indexed: 02/01/2023] Open
Abstract
Oxidative stress has been implicated to play a role, at least in part, in pathogenesis of many disease conditions and toxicities in animals. Overproduction of reactive oxygen species and free radicals beyond the cells intrinsic capacity to neutralize following xenobiotics exposure leads to a state of oxidative stress and resultant damages of lipids, protein, and DNA. Lead and cadmium are the common environmental heavy metal pollutants and have widespread distribution. Both natural and anthropogenic sources including mining, smelting, and other industrial processes are responsible for human and animal exposure. These pollutants, many a times, are copollutants leading to concurrent exposure to living beings and resultant synergistic deleterious health effects. Several mechanisms have been explained for the damaging effects on the body system. Of late, oxidative stress has been implicated in the pathogenesis of the lead- and cadmium-induced pathotoxicity. Several ameliorative measures to counteract the oxidative damage to the body system aftermath or during exposure to these toxicants have been assessed with the use of antioxidants. The present review focuses on mechanism of lead- and cadmium-induced oxidate damages and the ameliorative measures to counteract the oxidative damage and pathotoxicity with the use of supplemented antioxidants for their beneficial effects.
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Affiliation(s)
- R. C. Patra
- Department of Medicine, College of Veterinary Science and Animal Husbandry, Orissa University of Agriculture and Technology, Bhubaneswar 751003, India
- Division of Medicine, Indian Veterinary Research Institute, Izatnagar 243122, India
| | - Amiya K. Rautray
- Department of Medicine, College of Veterinary Science and Animal Husbandry, Orissa University of Agriculture and Technology, Bhubaneswar 751003, India
| | - D. Swarup
- Division of Medicine, Indian Veterinary Research Institute, Izatnagar 243122, India
- Central Institute for Research on Goats, Makhdoom 281122, UP, India
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Liu CM, Ma JQ, Sun YZ. Quercetin protects the rat kidney against oxidative stress-mediated DNA damage and apoptosis induced by lead. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2010; 30:264-71. [PMID: 21787659 DOI: 10.1016/j.etap.2010.07.002] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2010] [Revised: 07/02/2010] [Accepted: 07/09/2010] [Indexed: 05/25/2023]
Abstract
Quercetin, a flavonoid, effectively improved the lead-induced histology changes including structure damage and leukocyte infiltration in rat kidney. The present study was designed to explore the protective mechanism of quercetin against lead-induced oxidative DNA damage and apoptosis in rat kidney. We found that quercetin markedly decreased the ROS level and lowered the GSH/GSSG ratio in the kidney of lead-treated rat. The increase of 8-hydroxydeoxyguanosine level in the kidney of lead-treated rat was effectively suppressed by quercetin. Furthermore, quercetin markedly restored Cu/Zn-SOD, CAT and GPx activities in the kidney of lead-treated rat. TUNEL assay showed that lead-induced apoptosis in rat kidney was significantly inhibited by quercetin, which might be attributed to its antioxidant property. In conclusion, these results suggested that quercetin could protect the rat kidney against lead-induced injury by improving renal function, attenuating histopathologic changes, reducing ROS production, renewing the activities of antioxidant enzymes, decreasing DNA oxidative damage and apoptosis.
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Affiliation(s)
- Chan-Min Liu
- School of Life Science, Xuzhou Normal University, No. 101, Shanghai Road, Tangshan New Area, Xuzhou City 221116, Xuzhou City, PR China
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Liu CM, Zheng YL, Lu J, Zhang ZF, Fan SH, Wu DM, Ma JQ. Quercetin protects rat liver against lead-induced oxidative stress and apoptosis. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2010; 29:158-166. [PMID: 21787598 DOI: 10.1016/j.etap.2009.12.006] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Revised: 12/22/2009] [Accepted: 12/23/2009] [Indexed: 05/31/2023]
Abstract
Quercetin, a flavonoid, effectively improved the lead-induced histology changes including structure damage and leukocyte infiltration in rat liver. The present study was designed to explore the protective mechanism of quercetin against lead-induced hepatic injury. We found that quercetin markedly decreased the MDA and H(2)O(2) levels and lowered the GSH/GSSG ratio in the liver of lead-treated rat. Moreover, quercetin markedly restored Cu/Zn-SOD, Mn-SOD, CAT and GPx activities and upregulated mRNA expression levels of these proteins in the liver of lead-treated rat. Western blot analysis showed that quercetin significantly inhibited apoptosis by modulating the ratio of Bax to Bcl-2 expression and suppressing the expression of phosphorylated JNK1/2 and cleaved caspase-3 in the liver of lead-treated rat. In conclusion, these data suggest that quercetin protects the rat liver from lead-induced injury by attenuating lipid peroxidation, renewing the activities of antioxidant enzymes and inhibiting apoptosis.
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Affiliation(s)
- Chan-Min Liu
- Key Laboratory for Biotechnology on Medicinal Plants of Jiangsu Province, School of Life Science, Xuzhou Normal University, No. 101, Shanghai Road, Tangshan New Area, Xuzhou City 221116, Jiangsu, PR China
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Bennet C, Bettaiya R, Rajanna S, Baker L, Yallapragada PR, Brice JJ, White SL, Bokara KK. Region specific increase in the antioxidant enzymes and lipid peroxidation products in the brain of rats exposed to lead. Free Radic Res 2009; 41:267-73. [PMID: 17364954 DOI: 10.1080/10715760600889855] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The objective of this study is to determine the effect of lead (pb) on antioxidant enzymes and lipid peroxidation products in different regions of rat brain. Wistar male rats were treated with lead acetate (500 ppm) through drinking water for a period of 8 weeks. Control animals were maintained on sodium acetate. Treated and control rats were sacrificed at intervals of 1st, 4th and 8th week and the whole brains were dissected on ice into four regions namely the cerebellum, the hippocampus, the frontal cortex and the brain stem. Antioxidant enzymes namely catalase and superoxide dismutase in all the four regions of brain were determined. In addition, lipid peroxidation products were also estimated. The results indicated a gradual increase in the activity of antioxidant enzymes in different regions of the brain and this response was time-dependent. However, the increase was more in the cerebellum and the hippocampus compared to other regions of the brain. The lipid peroxidation products also showed a similar trend suggesting increased effect of lead in these two regions of the brain. The data indicated a region-specific oxidative stress in the brain exposed to lead.
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Affiliation(s)
- Christopher Bennet
- Department of Biological Sciences, Alcorn State University, Lorman, MS 39096, USA
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Yu DY, Li WF, Deng B, Mao XF. Effects of lead on hepatic antioxidant status and transcription of superoxide dismutase gene in pigs. Biol Trace Elem Res 2008; 126:121-8. [PMID: 18709493 DOI: 10.1007/s12011-008-8198-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2008] [Accepted: 07/11/2008] [Indexed: 11/24/2022]
Abstract
Ninety-six castrated boars (Duroc x Landrace x Yorkshire) were randomly divided into four groups, each of which was replicated three times with eight pigs. The groups received the same basal diet supplemented with 0, 5, 10, and 20 mg/kg lead, respectively. The malondialdehyde and glutathione levels, antioxidant enzymes activities, and zinc/copper superoxide dismutase (Zn/Cu SOD) mRNA content in the liver were determined to evaluate the lead hepatic intoxication caused by the lead. Results showed the increased lipid peroxides level and the reduced glutathione content, along with a concomitant decrease in the activities of superoxide dismutase, catalase, and glutathione peroxidase. Moreover, the level of hepatic Zn/Cu SOD mRNA was also significantly reduced. We suggest potential mechanism for lead intoxication in liver as follows: lead causes parallel decrease in Zn/Cu SOD mRNA and activities of antioxidant enzymes, leading to the declined ability of scavenging free radicals with excessive production of lipid peroxides, which seriously damages the hepatic structure and function.
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Affiliation(s)
- D Y Yu
- College of Animal Science, Feed Science Institute, Zhejiang University, No. 164, Qiutao North Road, Hangzhou 310029, People's Republic of China.
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16
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Flora SJS, Pande M, Bhadauria S, Kannan GM. Combined administration of taurine and meso 2,3-dimercaptosuccinic acid in the treatment of chronic lead intoxication in rats. Hum Exp Toxicol 2005; 23:157-66. [PMID: 15171566 DOI: 10.1191/0960327104ht432oa] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The present study describes the dose-dependent effect of taurine, an amino acid and a known antioxidant, either alone or in combination with meso 2,3-dimercaptosuccinic acid (DMSA) in the treatment of subchronic lead intoxication in male rats. The effects of these treatments in influencing the lead-induced alterations in haem synthesis, hepatic, renal or brain oxidative stress and lead concentration from soft tissues were investigated. Exposure to lead produced a significant inhibition of blood delta-aminolevulinic acid dehydratase (ALAD) activity, reduction in glutathione (GSH) and an increase in zinc protoporphyrin (ZPP) suggesting an altered haem synthesis pathway. Only DMSA was able to increase the activity of ALAD, while both taurine and DMSA were able to significantly increase GSH level towards normal. Animals treated with taurine significantly reduced the alterations in some of the biochemical parameters indicative of oxidative stress. Thiobarbituric acid reactive substance (TBARS) levels reduced significantly in liver, kidney and red blood cells, while GSH level increased. Activity of superoxide dismutase (SOD) also showed an increase in blood and brain in animals treated with taurine. The data also provided a promising role of taurine during chelation of lead by potentiating the depletion of blood, liver and brain lead compared to DMSA alone. It can thus be concluded from the study that concomitant administration of an antioxidant could play a significant and important role in abating a number of toxic effects of lead when administered along with the thiol chelators.
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Affiliation(s)
- S J S Flora
- Division of Pharmacology and Toxicology, Defence Research and Development Establishment, Jhansi Road, Gwalior 474 002, India.
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17
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Abstract
Recent studies have shown that lead causes oxidative stress by inducing the generation of reactive oxygen species, reducing the antioxidant defense system of cells via depleting glutathione, inhibiting sulfhydryl-dependent enzymes, interfering with some essential metals needed for antioxidant enzyme activities, and/or increasing susceptibility of cells to oxidative attack by altering the membrane integrity and fatty acid composition. Consequently, it is plausible that impaired oxidant/antioxidant balance can be partially responsible for the toxic effects of lead. Where enhanced oxidative stress contributes to lead-induced toxicity, restoration of a cell's antioxidant capacity appears to provide a partial remedy. Several studies are underway to determine the effect of antioxidant supplementation following lead exposure. Data suggest that antioxidants may play an important role in abating some hazards of lead. To explain the importance of using antioxidants in treating lead poisoning the following topics are addressed: (i) Oxidative damage caused by lead poisoning; (ii) conventional treatment of lead poisoning and its side effects; and (iii) possible protective effects of antioxidants in lead toxicity.
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Affiliation(s)
- H Gurer
- Department Of Toxicology, Faculty of Pharmacy, University of Hacettepe, Ankara, Turkey
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18
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Muñoz JJ, Roca C, Santos JL, Arroyo M, de Salamanca RE. Effect of zinc or S-adenosyl-l-methionine on long term administration of low doses of lead to rats. PHARMACOLOGY & TOXICOLOGY 1993; 73:189-91. [PMID: 8295845 DOI: 10.1111/j.1600-0773.1993.tb01562.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Two alternatives for the treatment of lead intoxication, administration of zinc or a thiol donor, S-adenosyl-L-methionine (SAM), were analysed. Rats were exposed to lead (Pb)-acetate (60 mg/l) in drinking water during 90 days; one group also received SO4Zn in water (40 mg/l), while another received both Pb and SAM (5 mg/24 hr intraperitoneally. Erythrocytic delta-aminolaevulinic dehydratase (ALA-D) activity was significantly reduced (P < 0.001) both in rats receiving Pb alone and in rats receiving Pb and each of the other two treatments. The high erythrocytic uroporphyrinogen synthetase (URO-S) activity noticed in Pb administered rats, was significantly (P < 0.001) reduced in animals treated either with zinc or with SAM. Hepatic ALA-D activity tended to decrease while renal enzyme activity was not modified by the low level Pb exposure used in this work. Interestingly, SAM treated rats in both tissues exhibited significantly (P < 0.01) higher activities of the enzyme. It is argued that SAM treatment causes a surplus of thiols that allows the full expression of ALA-D catalytic activity.
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Affiliation(s)
- J J Muñoz
- Porphyria Research Unit, University Hospital Doce de Octubre, Madrid, Spain
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19
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Quinlan GJ, Halliwell B, Moorhouse CP, Gutteridge JM. Action of lead(II) and aluminium (III) ions on iron-stimulated lipid peroxidation in liposomes, erythrocytes and rat liver microsomal fractions. BIOCHIMICA ET BIOPHYSICA ACTA 1988; 962:196-200. [PMID: 3167077 DOI: 10.1016/0005-2760(88)90159-2] [Citation(s) in RCA: 182] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Lead (Pb2+) ions accelerate the lipid peroxidation observed when Fe2+ ions are added to phospholipid liposomes at pH 5.5 or pH 7.4, although Pb2+ ions alone do not induce any peroxidation. Similarly, aluminium (Al3+) ions increase Fe2+-dependent liposomal peroxidation at pH 5.5. Both Pb2+ and Al3+ accelerate the peroxidation of erythrocytes induced by high concentrations of H2O2 in the presence of azide, and they also increase the peroxidation that occurs when Fe2+ or Fe2+-ADP is added to rat liver microsomes at pH 7.4. It is proposed that increased lipid peroxidation may contribute to the toxic actions of Pb2+ in humans.
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Affiliation(s)
- G J Quinlan
- National Institute for Biological Standards and Control, London, U.K
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20
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Korsrud GO, Meldrum JB. Effect on blood, liver, and kidney variables of age and of dosing rats with lead acetate orally or via the drinking water. Biol Trace Elem Res 1988; 17:151-66. [PMID: 2484354 DOI: 10.1007/bf02795453] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Levels of lead in the livers and kidneys of rats increased in proportion to the dose of lead acetate that the rats were given orally or in the drinking water. The activities of delta-aminolevulinic acid dehydratase (DALAD) in blood and liver decreased when the rats were dosed with lead, whereas glutathione levels in the blood increased. The decrease in the activity of blood DALAD was the most sensitive indicator of lead toxicity. Levels of lead in the livers and kidneys decreased after 3, 7, and 14 d of lead withdrawal. The activities of blood DALAD increased after 3 d of lead withdrawal. Groups of rats that initially weighted an average of 140 g were killed at weekly intervals for 6 wk. Blood hematocrits and liver glutathione levels increased, and blood DALAD and activated DALAD from blood decreased with increasing age of the rats. Activated DALAD activities from liver increased after the first week of the study.
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Affiliation(s)
- G O Korsrud
- Agriculture Canada, Health of Animals Laboratory, Saskatoon, Saskatchewan
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21
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Mylroie AA, Collins H, Umbles C, Kyle J. Erythrocyte superoxide dismutase activity and other parameters of copper status in rats ingesting lead acetate. Toxicol Appl Pharmacol 1986; 82:512-20. [PMID: 3952734 DOI: 10.1016/0041-008x(86)90286-3] [Citation(s) in RCA: 242] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The effects of lead ingestion on parameters indicative of copper status, and particularly on the activity of the copper-dependent metalloenzyme superoxide dismutase (SOD) in erythrocytes, were investigated in weanling and neonatal rats. In a series of experiments, Sprague-Dawley or Long-Evans rats were fed a nutritionally adequate purified diet (AIN-'76). Lead acetate was given orally in the drinking water (0, 100, 250, or 500 ppm Pb) to groups of 23 to 26-day-old rats for 5 weeks or intragastrically (0, 5, 11, 22, or 45 mg Pb/kg body wt/day) to pups from postnatal Days 2 through 20. Lead ingestion (250 and 500 ppm Pb) by weanling rats resulted in decreased concentrations of copper in blood (erythrocytes and serum), liver, and spleen, in increased concentrations of iron in liver and spleen, in increased spleen weight, and in a small decrease in hemoglobin and hematocrit values. There was a significant decrease in the activities of the copper metalloproteins erythrocyte superoxide dismutase (SOD) and serum ceruloplasmin (Cp). In contrast, in the neonate we found no significant effects of lead on copper concentrations in blood or tissue or on other measures indicative of copper status. Despite high blood lead concentrations (1-3 micrograms/ml), SOD activity was not decreased in the neonatal rat. In addition, lead had no direct effect in vitro on the activity of bovine blood superoxide dismutase. On the basis of both the in vitro and in vivo studies, it appears likely that the observed decrease in SOD in young rats is caused indirectly by a lead-induced copper deficiency rather than by a direct inhibitory effect of lead.
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Kajimoto M, Kondo M, Niwa M, Suzuki T, Kimura H, Sasaki A, Urata G. Increase of delta-aminolevulinic acid dehydratase (ALAD) in rat erythrocytes in lead poisoning. Arch Toxicol 1983; 52:1-11. [PMID: 6838373 DOI: 10.1007/bf00317977] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The well known fact that the activity of delta-aminolevulinic acid dehydratase (ALAD: EC 4.2.1.24) is reduced in red cells of animals with lead poisoning was found to be upset, by using a modified method of Gibson's original procedure, for determination of activated ALAD activity. The modified method involves addition of 0.2 mM Zn2+ and then preheating the enzyme solution at 60 degrees C for 5 min before following Gibson's original procedure. With this methodological modification, the ALAD activity of erythrocytes of rats poisoned with lead was found increased. Furthermore, the enzyme was purified from the peripheral blood of lead-poisoned rats. ALAD protein in peripheral blood was also determined by single radial immuno diffusion using rabbit anti-serum raised against rat liver ALAD. As the result, the ALAD activity obtained from the modified method was found to be directly proportional to the absolute amount of enzyme proteins determined both by chemically and immunochemically. The modified method for measuring true ALAD content in blood cells in lead poisoning is more reliable than previous ones.
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23
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Fujita H, Orii Y, Sano S. Evidence of increased synthesis of delta-aminolevulinic acid dehydratase in experimental lead-poisoned rats. BIOCHIMICA ET BIOPHYSICA ACTA 1981; 678:39-50. [PMID: 7306578 DOI: 10.1016/0304-4165(81)90045-3] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
delta-Aminolevulinic acid dehydratase (porphobilinogen synthase; 5-aminolevulinate hydro-lyase, EC 4.2.1.24) was purified from rat and rabbit erythrocytes to a homogeneous state. Specific activities were 26.0 and 26.6 units/mg protein for the rat and rabbit enzymes, respectively, and their estimated molecular weight was 280000, each consisting of 8 subunits of Mr 35000. In order to quantitate rat delta-aminolevulinic acid dehydratase at several stages of lead-poisoning, a radioimmunoassay technique using goat antiserum against the rat enzyme was developed for the first time. This technique was specific, reproducible and highly sensitive allowing determination of ng enzyme. When drinking water containing 25 mM lead acetate was given daily to rats ad lib. the delta-aminolevulinic acid dehydratase activity in the blood, assayed without any pretreatment, decreased to 8% of the control level on the next day. On the contrary, the restored enzyme activity, assayed in the presence of Zn2+ and dithiothreitol, was greater than normal by the fourth day of lead administration in bone-marrow cells and by the ninth day in the peripheral blood. The increased activity level stayed the same from the ninth day onward. The enzyme content as determined directly by the radioimmunoassay technique at this stage was about 2-fold above that the control. There was no significant difference in the number of reticulocytes and the distribution profile of different types of reticulocytes between the lead-exposed and non-exposed rats. Therefore, the increase in the amount of delta-aminolevulinic acid dehydratase in erythrocytes of lead-poisoned rats was suggested to be due to an increased rate of synthesis in the bone-marrow cells.
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24
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Ogilvie DM, Martin AH. Splenomegaly and adrenal weight changes in isolated adult mice chronically exposed to lead. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 1981; 26:647-651. [PMID: 7260434 DOI: 10.1007/bf01622150] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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25
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Schlick E, Friedberg KD. The action of small doses of lead on erythrocyte D-aminolevulinic acid dehydratase in the mouse. Arch Toxicol 1980; 43:213-20. [PMID: 7369869 DOI: 10.1007/bf00297586] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
After a single intraperitoneal administration of lead in very small doses [1--100 micrograms Pbac/kg body weight (bw)], there was a dose-dependent, highly significant inhibition of erythrocyte D-aminolevulinic acid dehydratase (D-ALA-D) activity in mice. The maximal inhibition occurred between 3 and 24 h post injection (p.i.). After that, a rapid recovery of the D-ALA-D activity took place so that four days after lead administration, enzyme activity exceeded even the normal value. Only after eight days p.i. did the D-ALA-D value return to the initial level after a biphasic course. After 10 i.p. injections of 0.1 to 10 micrograms Pbac/kg bw, there was again a dose-dependent, highly significant inhibition of the erythrocyte D-ALA-D activity in mice. The maximal inhibition was shown to be 24 h after the last lead injection. In contrast to the single i.p. administration, however, we found a monophasic course for the return of D-ALA-D activity. The D-ALA-D values did not exceed the normal range at any time after 10 i.p. lead injections. Ten and 30 days oral administration of lead corresponding to i.p. doses exhibited similar results in D-ALA-D inhibition.
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26
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Gelman BB, Michaelson IA, Bornschein RL. Brain lipofuscin concentration and oxidant defense enzymes in lead-poisoned neonatal rats. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH 1979; 5:683-98. [PMID: 490680 DOI: 10.1080/15287397909529780] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Neonatal rats were given aqueous lead acetate intragastrically from d 2-20 of life at doses of 0, 10, 50, and 225 mg Pb/kg.d. Blood Pb concentrations on d 21 were (mean +/- SE) 23 +/- 3 (control), 63 +/- 19, 246 +/- 55, and 994 +/- 223 microgram/100 ml, and brain Pb concentrations were 14 +/- 2, 60 +/- 5, 114 +/- 15, and 275 +/- 26 microgram/100 g, respectively. Growth was significantly depressed only in rats given the highest dose of Pb (225 mg/kg.d). Solvent-extractable lipofuscin pigment concentration of brain tissue progressively decreased over the 21-d duration of the experiment but was not significantly altered at any dose of Pb. Brain glutathione peroxidase, glucose-6-phosphate dehydrogenase, and 6-phosphogluconate dehydrogenase activities were stimulated on d 20 at the maximal dose of Pb, but the activities of brain superoxide dismutases and catalase were not altered by Pb exposure. Locomotor activity was significantly increased in the male animals on d 20, but only at the highest dose of Pb. These results indicate that Pb toxicity in neonatal rats is not associated with accelerated in vivo lipid peroxidation in the brain, but that certain oxidant defense mechanisms in the brain are stimulated by Pb.
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27
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Gelman BB, Michaelson IA. Neonatal lead toxicity and in vitro lipid peroxidation of rat brain. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH 1979; 5:671-82. [PMID: 490679 DOI: 10.1080/15287397909529779] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Neonatal rats were given aqueous lead acetate intragastrically from d 2--20 of life at doses of 0, 25, 75, and 225 mg Pb/kg.d. Blood Pb concentrations on d 21 were (mean +/- SE) 27 +/- 4 (control), 150 +/- 26, 263 +/- 63, and 518 +/- 97 microgram/100 ml, respectively. Growth was significantly depressed only in animals given the highest dose of Pb (225 mg/kg.d). Hematocrits were significantly decreased by d21 at all doses of Pb. Malondialdehyde (MDA) formation in 750 x g (10 min) brain supernatants induced spontaneously by aerobic incubation at 37 degrees C was not altered by Pb on d 7 and 14, but a slight decrease was observed on d 21. The extent of MDA formation induced by enzymatically generated superoxide anion was not altered by Pb toxicity during the first 21 d of life. Addition of Pb to 750 x g (10 min) brain supernatants in vitro significantly decreased MDA formation at Pb concentrations of 10(-5) M and higher. These results show that the central nervous system toxicity of Pb in neonatal rats is not associated with accelerated in vitro lipid peroxidation of brain tissue.
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