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Hallajzadeh J, Milajerdi A, Mobini M, Amirani E, Azizi S, Nikkhah E, Bahadori B, Sheikhsoleimani R, Mirhashemi SM. Effects of Nigella sativa on glycemic control, lipid profiles, and biomarkers of inflammatory and oxidative stress: A systematic review and meta-analysis of randomized controlled clinical trials. Phytother Res 2020; 34:2586-2608. [PMID: 32394508 DOI: 10.1002/ptr.6708] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 04/02/2020] [Accepted: 04/07/2020] [Indexed: 12/13/2022]
Abstract
The aim of this systematic review and meta-analysis was to evaluate the effects of Nigella sativa (N. sativa) on glycemic control, lipid profiles, and biomarkers of inflammatory and oxidative stress. Two independent authors systematically examined online databases consisting of, EMBASE, Scopus, PubMed, Cochrane Library, and Web of Science from inception until October 30, 2019. Cochrane Collaboration risk of bias tool was applied to assess the methodological quality of the studied trials. The heterogeneity among the included studies were assessed using the Cochrane's Q test and I-square (I2 ) statistic. Data were pooled using a random-effects model and weighted mean difference (WMD) was considered as the overall effect size. A total of 50 trials were included in this meta-analysis. We found a significant reduction in total cholesterol (WMD: -16.80; 95% CI: -21.04, -12.55), triglycerides (WMD: -15.73; 95% CI: -20.77, -10.69), LDL-cholesterol (WMD: -18.45; 95% CI: -22.44, -14.94) and VLDL-cholesterol (WMD: -3.72; 95% CI: -7.27, -0.18) following supplementation with N. sativa. In addition, there was significant reductive effect observed with N. sativa on fasting glucose (WMD: -15.18; 95% CI: -19.82, -10.55) and HbA1C levels (WMD: -0.45; 95% CI: -0.66, -0.23). Effects of N. sativa on CRP (WMD: -3.61; 95% CI: -9.23, 2.01), TNF-α (WMD: -1.18; 95% CI: -3.23, 0.86), TAC (WMD: 0.31; 95% CI: 0.00, 0.63), and MDA levels (WMD: -0.95; 95% CI: -2.18, 0.27) were insignificant. This meta-analysis demonstrated the beneficial effects of N. sativa on fasting glucose, HbA1c, triglycerides, total-, VLDL-, LDL-cholesterol levels.
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Affiliation(s)
- Jamal Hallajzadeh
- Department of Biochemistry and Nutrition, Research Center for Evidence-Based Health Management, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Alireza Milajerdi
- Students' Scientific Research Center, Tehran University of Medical Sciences, Tehran, Iran
- Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Moein Mobini
- Faculty of Kinesiology, University of Calgary, Calgary, Alberta, Canada
| | - Elaheh Amirani
- Research Center for Biochemistry and Nutrition in Metabolic Diseases, Kashan University of Medical Sciences, Kashan, Iran
| | - Susan Azizi
- Student Research Committe, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Elhameh Nikkhah
- Medicinal Plants Research Center, Maragheh University of Medical Sciences, Maragheh, Iran
| | - Babak Bahadori
- Medicinal Plants Research Center, Maragheh University of Medical Sciences, Maragheh, Iran
| | | | - Seyyed Mehdi Mirhashemi
- Metabolic Diseases Research Center, Research Institute for Prevention of Non-Communicable Diseases, Qazvin University of Medical Sciences, Qazvin, Iran
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Chokki M, Cudălbeanu M, Zongo C, Dah-Nouvlessounon D, Ghinea IO, Furdui B, Raclea R, Savadogo A, Baba-Moussa L, Avamescu SM, Dinica RM, Baba-Moussa F. Exploring Antioxidant and Enzymes (A-Amylase and B-Glucosidase) Inhibitory Activity of Morinda lucida and Momordica charantia Leaves from Benin. Foods 2020; 9:foods9040434. [PMID: 32260400 PMCID: PMC7230926 DOI: 10.3390/foods9040434] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 03/25/2020] [Accepted: 04/01/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Momordica charantia Linn. (Cucurbitaceae), the wild variety of bitter melon and Morinda lucida Benth (Rubiaceae) were commonly used as a popular folk medicine in Benin. This research focused to measure the antioxidant and enzyme inhibitory effects of M. charantia and M. lucida leaves and their antidiabetic activity. METHODS Antioxidant activities were evaluated by micro-dilution technique using DPPH free radical scavenging activity and β-carotene-linoleate bleaching assay. The α-amylase inhibition assay was carried out utilizing the 3,5-dinitrosalicylic acid procedure, while β-glucosidase inhibition assay was demonstrated using as substrate p-nitrophenyl-β-D-glucopyranoside (PNPG). HPLC-DAD analysis was realized using a high-performance liquid chromatography systems with diode-array detector, L-3000. RESULTS Chlorogenic acid, epicatechin, daidzein, rutin, naringin, quercetin, naringenin and genistein were identified as polyphenol compounds in the both plants extract. Dichloromethane and ethyl acetate extracts showed a good α-amylase inhibitory activity (56.46 ± 1.96% and 58.76 ± 2.74% respectively). M. lucida methanolic extract has shown IC50 of 0.51 ± 0.01 mg/mL, which is the lowest for DPPH scavenging activity. M. lucida dichloromethane extract showed the highest inhibitory capacity of β-glucosidase activity (82.11. ± 2.15%). CONCLUSION These results justify some traditional medicinal uses of both plants. The purified fractions could be used in future formulations, possibly incorporated in functional foods to combat certain diseases.
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Affiliation(s)
- Michaelle Chokki
- Laboratoire de Microbiologie et de Technologie Alimentaire, FAST, Université d’Abomey-Calavi, ISBA-Champ de foire, Cotonou 01BP: 526, Benin
- Laboratoire de Biochimie et immunologie Appliquées (LABIA), Ecole Doctorale Sciences et Technologies, Université Joseph KI-ZERBO, 03 BP 7021 Ouagadougou 03, Burkina-Faso; (C.Z.); (A.S.)
- Department of Chemistry, Physics and Environment, “Dunarea de Jos” University of Galati, 47 Domneasca Street, 800008 Galati, Romania; (M.C.); (D.D.-N.); (I.O.G.)
| | - Mihaela Cudălbeanu
- Department of Chemistry, Physics and Environment, “Dunarea de Jos” University of Galati, 47 Domneasca Street, 800008 Galati, Romania; (M.C.); (D.D.-N.); (I.O.G.)
| | - Cheikna Zongo
- Laboratoire de Biochimie et immunologie Appliquées (LABIA), Ecole Doctorale Sciences et Technologies, Université Joseph KI-ZERBO, 03 BP 7021 Ouagadougou 03, Burkina-Faso; (C.Z.); (A.S.)
| | - Durand Dah-Nouvlessounon
- Department of Chemistry, Physics and Environment, “Dunarea de Jos” University of Galati, 47 Domneasca Street, 800008 Galati, Romania; (M.C.); (D.D.-N.); (I.O.G.)
- Laboratory of Biology and Molecular Typing in Microbiology, Department of Biochemistry and Cell Biology, University of Abomey-Calavi, Faculty of Sciences and Techniques, Cotonou 05BP1604, Benin;
| | - Ioana Otilia Ghinea
- Department of Chemistry, Physics and Environment, “Dunarea de Jos” University of Galati, 47 Domneasca Street, 800008 Galati, Romania; (M.C.); (D.D.-N.); (I.O.G.)
| | - Bianca Furdui
- Department of Chemistry, Physics and Environment, “Dunarea de Jos” University of Galati, 47 Domneasca Street, 800008 Galati, Romania; (M.C.); (D.D.-N.); (I.O.G.)
- Correspondence: (R.M.D.); (B.F.); (F.B.-M.); Tel.: +033-6130-251 (R.M.D.); +033-6130-251 (B.F.); +229-9692-68-28 (F.B.-M.)
| | - Robert Raclea
- Department of Chemistry, Faculty of Natural Sciences, Imperial College London, London SW7 2AZ, UK;
| | - Aly Savadogo
- Laboratoire de Biochimie et immunologie Appliquées (LABIA), Ecole Doctorale Sciences et Technologies, Université Joseph KI-ZERBO, 03 BP 7021 Ouagadougou 03, Burkina-Faso; (C.Z.); (A.S.)
| | - Lamine Baba-Moussa
- Laboratory of Biology and Molecular Typing in Microbiology, Department of Biochemistry and Cell Biology, University of Abomey-Calavi, Faculty of Sciences and Techniques, Cotonou 05BP1604, Benin;
| | - Sorin Marius Avamescu
- Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 90-92 Soseaua Panduri, Bucharest, Romania;
- University of Agronomic Science and Veterinary Medicine, 59 Marasti Blvd, 011464 Bucharest, Romania
| | - Rodica Mihaela Dinica
- Department of Chemistry, Physics and Environment, “Dunarea de Jos” University of Galati, 47 Domneasca Street, 800008 Galati, Romania; (M.C.); (D.D.-N.); (I.O.G.)
- Correspondence: (R.M.D.); (B.F.); (F.B.-M.); Tel.: +033-6130-251 (R.M.D.); +033-6130-251 (B.F.); +229-9692-68-28 (F.B.-M.)
| | - Farid Baba-Moussa
- Laboratoire de Microbiologie et de Technologie Alimentaire, FAST, Université d’Abomey-Calavi, ISBA-Champ de foire, Cotonou 01BP: 526, Benin
- Correspondence: (R.M.D.); (B.F.); (F.B.-M.); Tel.: +033-6130-251 (R.M.D.); +033-6130-251 (B.F.); +229-9692-68-28 (F.B.-M.)
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Bacanlı M, Aydın S, Anlar HG, Çal T, Arı N, Ündeğer Bucurgat Ü, Başaran AA, Başaran N. Can ursolic acid be beneficial against diabetes in rats? ACTA ACUST UNITED AC 2018. [DOI: 10.1515/tjb-2017-0289] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Abstract
Objective:
Diabetes mellitus, a heteregenous metabolic and chronic disease, is a growing health problem especially in developing countries. It is claimed that diabetes associated with increased formation of free radicals and decrease in antioxidant potential and also alterations in lipid profile and enzyme levels. Ursolic acid is commonly used in traditional Chinese medicine due to its beneficial effects. The aim of this study was to investigate the effects of ursolic acid on streptozotocin-induced diabetes in Wistar albino rats.
Methods:
DNA damage was evaluated in the blood and liver cells of rats by alkaline comet assay. The activities of antioxidant enzymes, oxidative stress parameters, biochemical parameters, hepatic enzyme levels and lipid profile parameters were also evaluated.
Results:
The results of this study demonstrate that diabetes caused genotoxic damage, changes in hepatic enzyme and lipid profile, biochemical and antioxidant enzyme activities and oxidative stress parameters in rats. Ursolic acid was found to be protective against diabetes induced effects in blood and liver samples of rats.
Conclusions:
According to our results, it seems that ursolic acid may be beneficial against diabetes and its adverse effects in rats.
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Bacanli M, Aydin S, Anlar HG, Çal T, Ündeğer Bucurgat Ü, Ari N, Başaran AA, Başaran N. Protective Effects of Ursolic Acid in the Kidneys of Diabetic Rats. Turk J Pharm Sci 2018; 15:166-170. [PMID: 32454656 DOI: 10.4274/tjps.49469] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Accepted: 07/19/2017] [Indexed: 12/26/2022]
Abstract
Objectives Diabetes, a heteregenous metabolic and chronic disease, is a growing health problem in most countries. It has been claimed that diabetes is associated with the increased formation of free radicals and decreased in antioxidant potential. Oxidative stress formed in diabetes may cause DNA damage in the tissues. Ursolic acid, a well-known pentacylic triterpene, is commonly used in traditional Chinese medicine due to its beneficial health effects such as antioxidant, anticancer, and antiulcer properties. The aim of this study was to investigate the effects of ursolic acid in the kidneys of Wistar albino rats with streptozotocin-induced diabetes. Materials and Methods DNA damage was evaluated in the kidney cells of rats using alkaline comet assays. Oxidative stress parameters such as CAT, SOD, GR, and GSH-Px enzyme activities and total GSH and MDA levels were also evaluated. Results Ursolic acid treatment was found to significantly decrease DNA damage, GR enzyme activities, and MDA levels, and significantly increase GSH levels and CAT, SOD and GSH-Px enzyme activities in diabetic rats. Conclusion According to our results, it seems that ursolic acid may be beneficial against diabetes-induced renal damage.
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Affiliation(s)
- Merve Bacanli
- Hacettepe Unversity, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara, Turkey
| | - Sevtap Aydin
- Hacettepe Unversity, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara, Turkey
| | - Hatice Gül Anlar
- Hacettepe Unversity, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara, Turkey
| | - Tuğbagül Çal
- Karadeniz Technical University, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Trabzon, Turkey
| | - Ülkü Ündeğer Bucurgat
- Hacettepe Unversity, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara, Turkey
| | - Nuray Ari
- Ankara Unversity, Faculty of Pharmacy, Department of Pharmacology, Ankara, Turkey
| | - A Ahmet Başaran
- Hacettepe Unversity, Faculty of Pharmacy, Department of Pharmacognosy, Ankara, Turkey
| | - Nurşen Başaran
- Hacettepe Unversity, Faculty of Pharmacy, Department of Pharmaceutical Toxicology, Ankara, Turkey
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Parthasarathy L, Khadilkar V, Chiplonkar S, Khadilkar A. Effect of Antioxidant Supplementation on Total Antioxidant Status in Indian Children with Type 1 Diabetes. J Diet Suppl 2018; 16:390-400. [PMID: 29958027 DOI: 10.1080/19390211.2018.1470123] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Hyperglycemia results in the overproduction of free oxygen radicals that impair the endogenous antioxidant defenses. A randomized controlled trial was conducted to compare the effect of 3 months of antioxidant supplementation in the form of foods rich in micronutrients with pharmacological supplement on total antioxidant status of Indian children with type 1 diabetes. Ninety children with diabetes (mean age 11.5 ± 3.6 yrs, 37 boys) were randomly allocated to three groups: Group 1 (n = 31) = DM controls; Group 2 (n = 30) = multimicronutrient syrup; and Group 3 (n = 29) = dietary supplements (nine snack recipes rich in micronutrients). They received intervention for 3 months. Healthy controls were enrolled from local schools. Fasting blood was tested for total antioxidant status (TAS) and glycosylated hemoglobin (HbA1C). Children with diabetes had lower TAS (0.70 ± 0.2 vs. 1 ± 0.24 mmol/l, p = .0001) compared to healthy controls. Anthropometric and biochemical parameters were similar at baseline for all groups of diabetic children. Group 1 showed significant deterioration in TAS at endline (0.72 ± 0.16 vs. 0.60 ± 0.17 mmol/l, p = .008). Increase in TAS recorded in Group 2 was from 0.66 ± 0.21 to 0.70 ± 0.16 mmol/l and in Group 3 was from 0.68 to 0.73 mmol/l. There was a significant difference between Group 1 and Group 3 for percentage change in TAS (-13% vs. 16%, p = .035). Postsupplementation there was an increase in TAS values in children with diabetes, but they were still lower than in healthy controls. Indian diabetic children have compromised antioxidant status, which may be improved by incorporation of multimicronutrient-rich recipes in their diets.
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Affiliation(s)
- Lavanya Parthasarathy
- a Growth and Endocrine Unit , Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital , Pune , India
| | - Vaman Khadilkar
- a Growth and Endocrine Unit , Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital , Pune , India
| | - Shashi Chiplonkar
- a Growth and Endocrine Unit , Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital , Pune , India
| | - Anuradha Khadilkar
- a Growth and Endocrine Unit , Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital , Pune , India
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Golizeh M, Lee K, Ilchenko S, Ösme A, Bena J, Sadygov RG, Kashyap SR, Kasumov T. Increased serotransferrin and ceruloplasmin turnover in diet-controlled patients with type 2 diabetes. Free Radic Biol Med 2017; 113:461-469. [PMID: 29079528 PMCID: PMC5739305 DOI: 10.1016/j.freeradbiomed.2017.10.373] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/22/2017] [Accepted: 10/22/2017] [Indexed: 01/07/2023]
Abstract
Type 2 diabetes mellitus (T2DM) is associated with oxidative stress and perturbed iron metabolism. Serotransferrin (Trf) and ceruloplasmin (Cp) are two key proteins involved in iron metabolism and anti-oxidant defense. Non-enzymatic glycation and oxidative modification of plasma proteins are known to occur under hyperglycemia and oxidative stress. In this study, shotgun proteomics and 2H2O-based metabolic labeling were used to characterize post-translational modifications and assess the kinetics of Trf and Cp in T2DM patients and matched controls in vivo. Six early lysine (Amadori) and one advanced arginine glycation were detected in Trf. No glycation, but five asparagine deamidations, were found in Cp. T2DM patients had increased fractional catabolic rates of both Trf and Cp that correlated with HbA1c (p < 0.05). The glycated Trf population was subject to an even faster degradation compared to the total Trf pool, suggesting that hyperglycemia contributed to an increased Trf degradation in T2DM patients. Enhanced production of Trf and Cp kept their levels stable. The changes in Trf and Cp turnover were associated with increased systemic oxidative stress without any alteration in iron status in T2DM. These findings can help better understand the potential role of altered Trf and Cp metabolism in the pathogenesis of T2DM and other diseases.
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Affiliation(s)
- Makan Golizeh
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States
| | - Kwangwon Lee
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States
| | - Serguei Ilchenko
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States
| | - Abdullah Ösme
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States
| | - James Bena
- Section of Biostatistics, Quantitative Health Sciences, Cleveland Clinic, Cleveland, OH, United States
| | - Rovshan G Sadygov
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, United States
| | - Sangeeta R Kashyap
- Department of Endocrinology, Cleveland Clinic, Cleveland, OH, United States
| | - Takhar Kasumov
- Department of Pharmaceutical Sciences, Northeast Ohio Medical University, Rootstown, OH, United States; Department of Endocrinology, Cleveland Clinic, Cleveland, OH, United States.
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Takitani K, Inoue K, Koh M, Miyazaki H, Kishi K, Inoue A, Tamai H. α-Tocopherol status and altered expression of α-tocopherol-related proteins in streptozotocin-induced type 1 diabetes in rat models. J Nutr Sci Vitaminol (Tokyo) 2016; 60:380-6. [PMID: 25866300 DOI: 10.3177/jnsv.60.380] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Vitamin E plays a critical role as an antioxidant in several pathological conditions, including diabetes, cancer, cardiovascular diseases, and neurodegenerative disorders. Diabetes is a metabolic disorder of glucose due to the lack of adequate insulin production (type 1) or peripheral insulin resistance (type 2). Oxidative stress plays a major role in the pathogenesis of diabetes and its complications. The purpose of the present study was to determine α-tocopherol status and the expression of α-tocopherol-related proteins, including binding proteins and metabolizing enzymes, under streptozotocin (STZ)-induced type 1 diabetes in rat models. In STZ rats, plasma α-tocopherol levels decreased compared to the control rats, whereas hepatic α-tocopherol levels in the STZ rats were significantly increased. CuZn-superoxide dismutase (SOD) gene expression in the liver of STZ rats was markedly decreased, whereas Mn-SOD gene expression remained unaltered. Accelerated lipid peroxidation in the liver of STZ rats was observed and the hepatic expression of α-tocopherol transfer protein (α-TTP) in STZ rats decreased compared to that in the controls. The hepatic expression of cytochrome P450 4F2 (CYP4F2) and CYP3A2 genes in STZ rats also decreased. The reduced expression of hepatic α-TTP and CYP4F2 genes probably leads to decreased plasma α-tocopherol levels and elevated α-tocopherol levels in the liver of STZ rats. The altered expression of hepatic α-tocopherol-related proteins might regulate α-tocopherol status in type 1 diabetes. Determining the mechanism of modulating α-tocopherol status may be helpful in promoting antioxidant therapy in diabetes.
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MEDJAHED Z, ATMANI-KILANI D, FAUCONNIER ML, RICHARD G, ATMANI D. Hepatoprotective and antidiabetic activities of Fraxinus angustifolia Vahl extracts in animal models: characterization by high performance liquid chromatography analysis. Turk J Med Sci 2016; 46:910-20. [DOI: 10.3906/sag-1502-13] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 05/11/2015] [Indexed: 11/03/2022] Open
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Kaatabi H, Bamosa AO, Badar A, Al-Elq A, Abou-Hozaifa B, Lebda F, Al-Khadra A, Al-Almaie S. Nigella sativa improves glycemic control and ameliorates oxidative stress in patients with type 2 diabetes mellitus: placebo controlled participant blinded clinical trial. PLoS One 2015; 10:e0113486. [PMID: 25706772 PMCID: PMC4338020 DOI: 10.1371/journal.pone.0113486] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2014] [Accepted: 10/26/2014] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND AND OBJECTIVE Oxidative stress plays an important role in pathogenesis of diabetes mellitus and its complications. Our previous study has shown glucose lowering effect produced by 3 months supplementation of Nigella sativa (NS) in combination with oral hypoglycemic drugs among type 2 diabetics. This study explored the long term glucose lowering effect (over one year) of NS in patients with type 2 diabetes mellitus on oral hypoglycemic drugs and to study its effect on redox status of such patients. METHODS 114 type 2 diabetic patients on standard oral hypoglycemic drugs were assigned into 2 groups by convenience. The control group (n = 57) received activated charcoal as placebo and NS group (n = 57) received 2g NS, daily, for one year in addition to their standard medications. Fasting blood glucose (FBG), glycosylated hemoglobin (HbA1c), C- peptide, total antioxidant capacity (TAC), superoxide dismutase (SOD), catalase (CAT), glutathione and thiobarbituric acid reactive substances (TBARS) at the baseline, and every 3 months thereafter were determined. Insulin resistance and β-cell activity were calculated using HOMA 2 calculator. RESULTS Comparison between the two groups showed a significant drop in FBG (from 180 ± 5.75 to 180 ± 5.59 in control Vs from 195 ± 6.57 to 172 ± 5.83 in NS group), HbA1c (from 8.2 ± 0.12 to 8.5 ± 0.14 in control VS from 8.6 ± 0.13 to 8.2 ± 0.14 in NS group), and TBARS (from 48.3 ± 6.89 to 52.9 ± 5.82 in control VS from 54.1 ± 4.64 to 41.9 ± 3.16 in NS group), in addition to a significant elevation in TAC, SOD and glutathione in NS patients compared to controls. In NS group, insulin resistance was significantly lower, while β-cell activity was significantly higher than the baseline values during the whole treatment period. CONCLUSION Long term supplementation with Nigella sativa improves glucose homeostasis and enhances antioxidant defense system in type 2 diabetic patients treated with oral hypoglycemic drugs. TRIAL REGISTRATION Clinical Trials Registry-India (CTRI) CTRI/2013/06/003781.
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Affiliation(s)
- Huda Kaatabi
- Department of Physiology, College of Medicine, University of Dammam, Dammam, Saudi Arabia
| | - Abdullah Omar Bamosa
- Department of Physiology, College of Medicine, University of Dammam, Dammam, Saudi Arabia
- * E-mail:
| | - Ahmed Badar
- Department of Physiology, College of Medicine, University of Dammam, Dammam, Saudi Arabia
| | - Abdulmohsen Al-Elq
- Department of Medicine, College of Medicine, University of Dammam, Dammam, Saudi Arabia
| | - Bodour Abou-Hozaifa
- Department of Physiology, College of Medicine, University of Dammam, Dammam, Saudi Arabia
| | - Fatma Lebda
- Department of Physiology, College of Medicine, University of Dammam, Dammam, Saudi Arabia
| | - Akram Al-Khadra
- Department of Medicine, College of Medicine, University of Dammam, Dammam, Saudi Arabia
| | - Sameeh Al-Almaie
- Department of Family Medicine, College of Medicine, University of Dammam, Dammam, Saudi Arabia
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Ferder M, Inserra F, Manucha W, Ferder L. The world pandemic of vitamin D deficiency could possibly be explained by cellular inflammatory response activity induced by the renin-angiotensin system. Am J Physiol Cell Physiol 2013; 304:C1027-39. [PMID: 23364265 DOI: 10.1152/ajpcell.00403.2011] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review attempts to show that there may be a relationship between inflammatory processes induced by chronic overstimulation of the renin-angiotensin system (RAS) and the worldwide deficiency of vitamin D (VitD) and that both disorders are probably associated with environmental factors. Low VitD levels represent a risk factor for several apparently different diseases, such as infectious, autoimmune, neurodegenerative, and cardiovascular diseases, as well as diabetes, osteoporosis, and cancer. Moreover, VitD insufficiency seems to predispose to hypertension, metabolic syndrome, left ventricular hypertrophy, heart failure, and chronic vascular inflammation. On the other hand, inappropriate stimulation of the RAS has also been associated with the pathogenesis of hypertension, heart attack, stroke, and hypertrophy of the left ventricle and vascular smooth muscle cells. Because VitD receptors (VDRs) and RAS receptors are almost distributed in the same tissues, a possible link between VitD and the RAS is even more plausible. Furthermore, from an evolutionary point of view, both systems were developed simultaneously, actively participating in the regulation of inflammatory and immunological mechanisms. Changes in RAS activity and activation of the VDR seem to be inversely related; thus any changes in one of these systems would have a completely opposite effect on the other, making it possible to speculate that the two systems could have a feedback relationship. In fact, the pandemic of VitD deficiency could be the other face of increased RAS activity, which probably causes lower activity or lower levels of VitD. Finally, from a therapeutic point of view, the combination of RAS blockade and VDR stimulation appears to be more effective than either RAS blockade or VDR stimulation individually.
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Affiliation(s)
- Marcelo Ferder
- Facultad de Medicina, Universidad de Buenos Aires, Buenos Aires, Argentina
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Mikhailidis DP, Ganotakis ES. Plasma albumin and platelet function: relevance to atherogenesis and thrombosis. Platelets 2012; 7:125-37. [PMID: 21043591 DOI: 10.3109/09537109609023571] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Two papers published in this journal(1,2) during the past year remind us that plasma albumin concentrations can influence platelet function. These publications, together with epidemiological evidence showing that low plasma concentrations of albumin predict mortality from cardiovascular disease(3,4) have prompted this review.
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Affiliation(s)
- D P Mikhailidis
- Department of Chemical Pathology & Human Metabolism, Royal Free Hospital & School of Medicine (University of London), Pond Street, London NW3 2QG, UK
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Giannubilo SR, Tiano L, Cecchi S, Principi F, Tranquilli AL, Littarru GP. Plasma coenzyme Q10 is increased during gestational diabetes. Diabetes Res Clin Pract 2011; 94:230-5. [PMID: 21816499 DOI: 10.1016/j.diabres.2011.07.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2011] [Revised: 07/04/2011] [Accepted: 07/05/2011] [Indexed: 11/22/2022]
Abstract
OBJECTIVES To determine plasma CoQ(10) concentration in the course of gestational diabetes mellitus. STUDY DESIGN The assessment was provided longitudinally during the third trimester of pregnancy in 40 women with gestational diabetes mellitus (GDM) and 40 normal controls. CoQ(10) was measured with the HPLC method. CoQ(10) results were also normalized to plasma cholesterol concentration (nmoles/mmoles). Plasma samples were collected longitudinally throughout the third trimester. RESULTS No statistically significant difference of plasma CoQ(10)/cholesterol levels between GDM patients and controls at 28-32 and 32-36 weeks of gestation, this difference was significant in late pregnancy (36-40 weeks), similarly, in the same gestational period, there was an increased level of HOMA-IR as index of insulin resistance ORAC as index of oxidative stress. CONCLUSIONS Since coenzyme Q(10) is believed to be an important cellular antioxidant defence, higher levels of CoQ(10) in GDM patients may be a compensatory mechanism, in response to an activated oxidative stress, probably associated to hyperglycaemia and insulin resistance.
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Abstract
It was studied that type 2 diabetes mellitus is connected with increased plasma lipid peroxidation (lipid peroxidation expressed as malondialdehyde). This review aimed to evaluate the state of lipid peroxidation among type 2 diabetic subjects. Present finding showed that lipid peroxidation increased in type 2 diabetes mellitus. Increased lipid peroxidation maybe is associated with some diseases such as cancer, cardiovascular diseases and diabetes mellitus. Lipid peroxidation has an important role in the pathogenesis and the complications of diabetes. Antioxidants have been found to prevent the progression and occurrence of diabetes. There are several mechanisms that may cause lipid peroxidation affront in diabetic subjects, although, their precise contributions are not completely clear. We proposed that production of free radicals can be reduced by preventing high blood glucose levels and by the control of instabilities in blood glucose levels. A contributor to these instabilities in blood glucose is glycaemic control by using of fast blood sugar test. Furthermore, the earlier assessment of the advancement of diabetes that firmly control of blood glucose can be obtained; the greater will be the decrease in diabetic complications. Patients with type 2 diabetes may have very high physiological antioxidants requirements.
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Affiliation(s)
- A Marjani
- Biochemistry and Metabolic Disorder Research Center, Department of Biochemistry and Biophysics, Golestan University of Medical Sciences, Gorgan, Golestan Province, Iran
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14
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Menke T, Niklowitz P, Wiesel T, Andler W. Antioxidant level and redox status of coenzyme Q10 in the plasma and blood cells of children with diabetes mellitus type 1. Pediatr Diabetes 2008; 9:540-5. [PMID: 18694454 DOI: 10.1111/j.1399-5448.2008.00389.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Hyperglycaemia has been reported to cause increased production of oxygen free radicals. Oxidative stress may contribute to the pathogenesis of diabetic complications. Coenzyme Q(10) (CoQ(10)) is known for its key role in mitochondrial bioenergetics and is considered as a potent antioxidant and free radical scavenger. This study was conducted to evaluate plasma and blood cell concentrations of CoQ(10) in accordance to its redox capacity in children with diabetes mellitus type 1. CoQ(10) plasma and blood cell concentrations and redox status were measured using high-performance liquid chromatography with electrochemical detection in 43 children with diabetes mellitus type 1 and compared with 39 healthy children. In addition, the diabetic patients were subdivided according to their haemoglobin A1c (HbA1c) values into two groups, that is, those with good control (<8%) and those with poor control (>8%), and the CoQ(10) status was compared between the two groups. Children with type 1 diabetes showed increased plasma levels of CoQ(10) in comparison to healthy children. While CoQ(10) erythrocyte and platelet concentrations did not differ, in the diabetes group, the platelet redox status differed with a significantly increased part of reduced CoQ(10). This difference in concentration and redox status in comparison to healthy controls may be attributed to the subgroup of patients with poor control, as the subdivision of diabetic patients according to their HbA1c values shows. In diabetic children, especially in those with poor control, an increase in plasma concentration and intracellular redox capacity of the antioxidant CoQ(10) may contribute to the body's self-protection during a state of enhanced oxidative stress.
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Affiliation(s)
- Thomas Menke
- Children's Hospital of Datteln, University of Witten/Herdecke, Datteln, Germany
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15
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Ramakrishna V, Jailkhani R. Evaluation of oxidative stress in Insulin Dependent Diabetes Mellitus (IDDM) patients. Diagn Pathol 2007; 2:22. [PMID: 17603912 PMCID: PMC1936413 DOI: 10.1186/1746-1596-2-22] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2007] [Accepted: 07/01/2007] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND Free radical mediated oxidative stress is mainly involved in the pathogenesis of diabetic complications. Proteins and lipids are among the prime targets for oxidative stress. In the present study, we evaluated the oxidative stress in chronic IDDM patients by estimating the lipid peroxidation, protein oxidation, and antioxidants status. SUBJECTS AND DESIGN A total of 35 (15 IDDM + 20 normal healthy) children were examined in the study and estimated the lipid peroxidation, protein oxidation, and antioxidants - vitamin A (beta-carotene, retinol), vitamin C, vitamin E and enzymatic antioxidants and nitric oxide. RESULTS A statistically significant higher values of protein carbonyl groups and MDA as lipid peroxides were observed in diabetic patients with slight reduction in the synthesis of nitric oxide. It is interesting to note that there was a decrease in the antioxidant levels with corresponding increased protein and lipid oxidation. On PAGE under native conditions, we observed decreased levels of proteins - albumin, transferrin, ceruloplasmin and heptoglobulins and variable GC globulin fractions in IDDM compared to normal healthy controls. CONCLUSION Hyperglycemia induces the overproduction of oxygen free radicals and consequently increases the protein oxidation and lipid oxidation. A significance difference in the mean plasma concentration of total antioxidant status was observed in IDDM patients. The findings of the present study suggest that diabetes in an altered metabolic state of oxidation-reduction and that it is convenient to give therapeutic interventions with antioxidants.
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Affiliation(s)
- Vadde Ramakrishna
- Department of Biochemistry, Shri B.M. Patil Medical College, Bijapur 586 103, India
- Department of Biotechnology, Sri Krishnadevaraya University, Anantapur 515 003, India
| | - Rama Jailkhani
- Department of Biochemistry, Shri B.M. Patil Medical College, Bijapur 586 103, India
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16
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Diao WF, Chen WQ, Wu Y, Liu P, Xie XL, Li S, Shen PP, Ji J. Serum, liver, and kidney proteomic analysis for the alloxan-induced type I diabetic mice after insulin gene transfer of naked plasmid through electroporation. Proteomics 2007; 6:5837-45. [PMID: 17022097 DOI: 10.1002/pmic.200500697] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Gene therapy has been reported to be effective in treating diabetes mellitus (DM), while little has been found out about the functional protein changes since. The liver and kidney play important roles in glucose absorption, metabolism, and excretion. Changes in the two organs may reflect pathologic alterations during DM, while the serum has a direct connection with most organs and pathological changes. We used alloxan to induce diabetic mice, electrotranferred the insulin gene into their sural muscles, and discovered that their blood glucose decreased to normal level. Consequently, proteomic approaches were applied to evaluate protein changes in the liver, kidney, and serum of normal, diabetic, and gene transferred mice. Forty-three proteins were found either up-regulated or down-reglulated in the liver, kidney, and serum of the alloxan-induced type I diabetic mice. Only five proteins in the liver, five proteins in the kidney, and seven proteins in the serum of diabetic mice were found to be back-regulated to normal levels after gene transfer. These back-regulated proteins are involved in lipid and glucose metabolism, associated with phosphorylation, signal transduction, oxidation, and immune inflammation. Our findings might promote a better understanding for the mechanism of DM, and provide novel targets for estimating the effects of gene therapy.
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Affiliation(s)
- Wei-Fei Diao
- Department of Biochemistry and Molecular Biology, College of Life Sciences, National Laboratory of Protein Engineering and Plant Genetic Engineering, Peking University, Beijing, People's Republic of China
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17
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Martín-Gallán P, Carrascosa A, Gussinye M, Domínguez C. Estimation of lipoperoxidative damage and antioxidant status in diabetic children: relationship with individual antioxidants. Free Radic Res 2006; 39:933-42. [PMID: 16087474 DOI: 10.1080/10715760500156751] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Increased oxidative stress has emerged as a potential mechanism implicated in the pathogenesis, progression and cell dysfunction associated with many diseases including diabetes. In routine clinical practice, the estimation of the degree of oxidative damage and antioxidant status, even in paediatric patients, by appropriate techniques appears to be of interest. The aim of this study was to reliably identify patients with increased oxidant stress and/or reduced antioxidant defence mechanisms with a small blood sample and verify the applicability to the study of diabetic children (DC) at clinical onset of the disease. In 1-ml blood samples from 30 DC and 34 controls, techniques for accurately measuring malondialdehyde (MDA) concentrations in plasma and erythrocytes (using HPLC analysis with fluorometric detection), total radical antioxidant potential (TRAP) and blood plasma oxidizability were adapted and validated. Plasma alpha-tocopherol (HPLC), uric acid and sulfhydryl (SH) groups were also determined. At clinical onset of diabetes a significant reduction in plasma TRAP values (P<0.01) was observed in DC compared with controls. Similarly, a significant fall in individual antioxidant levels (alpha-tocopherol/total lipids, uric acid and protein SH) was noted in plasma of DC. Highly significant increases were found in both plasma and erythrocyte MDA levels in DC (p-MDA:1.7+/-0.2 microM; er-MDA: 7.2+/-0.7 nmol/g Hb) compared with controls (p-MDA:0.86+/-0.09 microM; P<0.0003; er-MDA:3.8+/-0.2 nmol/g Hb, P<0.0001). Plasma MDA and triglyceride levels correlated directly only in DC (P<0.001). Whole plasma oxidizability was significantly higher in DC than in controls (P<0.0001) and this parameter correlated significantly with plasma cholesterol and triglyceride concentrations (P<0.0001). The micromethods adapted and applied to the simultaneous detection of lipid peroxidation products and antioxidant status permit accurate and reliable assessment of the oxidative stress process in small plasma samples. Our results clearly show systemic peroxidative damage associated with insufficient defence mechanisms against ROS to be already present at clinical onset of type 1 diabetes mellitus in children and adolescents.
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Affiliation(s)
- Pilar Martín-Gallán
- Biochemistry and Molecular Biology Centre, Hospital Universitario Vall d'Hebron, Barcelona, Spain
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18
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Hata I, Kaji M, Hirano S, Shigematsu Y, Tsukahara H, Mayumi M. Urinary oxidative stress markers in young patients with type 1 diabetes. Pediatr Int 2006; 48:58-61. [PMID: 16490072 DOI: 10.1111/j.1442-200x.2006.02156.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Involvement of oxidative stress in the pathogenesis of diabetic vascular complications has been proposed. However, there are few methods to determine the status of oxidative stress both directly and quantitatively in young patients with type 1 diabetes. METHODS A total of 27 young patients with type 1 diabetes (mean age +/- SD, 12.6 +/- 4.2 years) with normal renal function and 38 healthy control subjects (13.0 +/- 4.6 years) were investigated. Early morning voiding urine samples were collected. The concentrations of acrolein-lysine adducts, 8-hydroxy-2'-deoxyguanosine (8-OHdG) were determined using competitive enzyme-linked immunosorbent assay, and nitric oxide metabolites were measured using the colorimetric, non-enzymatic assay. RESULTS Urinary concentrations of 8-OHdG, but not acrolein-lysine adducts and nitric oxide metabolites, were significantly increased in the diabetic group. For diabetic patients, microalbuminuria was significantly correlated with higher concentrations of all three markers. Hemoglobin A(1c) values were significantly correlated with 8-OHdG values. CONCLUSIONS These findings indicate that increased oxidative stress and the risk of vascular complications may be present at early stages of type 1 diabetes.
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Affiliation(s)
- Ikue Hata
- Department of Pediatrics, Faculty of Medical Sciences, University of Fukui, Japan.
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19
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Varvarovská J, Racek J, Stetina R, Sýkora J, Pomahacová R, Rusavý Z, Lacigová S, Trefil L, Siala K, Stozický F. Aspects of oxidative stress in children with type 1 diabetes mellitus. Biomed Pharmacother 2005; 58:539-45. [PMID: 15589060 DOI: 10.1016/j.biopha.2004.09.011] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2004] [Indexed: 11/29/2022] Open
Abstract
Diabetes mellitus is considered to be one of a rank of free radical diseases. The existence of hyperglycemia produces increased oxidative stress (OS) via non-enzymatic glycation, glucose autoxidation, and alterations in polyol pathway activity with subsequent influences on the whole organism. In childhood, Type 1 diabetes prevails and is characterized by its autoimmune character with progressive destruction of beta cells and lack of insulin in genetically predisposed patients. Our study focused on diabetic children and their 1st degree relatives and confirmed increased oxidative stress in diabetic children as well as a similar tendency in their siblings. Following this, we carried out a one-year study comprising diabetic children supplemented with vitamins E and C. The vitamin treatment improved diabetes control and reduced markers of oxidative stress substantially when compared with non-supplemented diabetic children. As oxidative stress impairs not only lipids and proteins, but also DNA, we attempted to examine the level of DNA strand breaks as well as DNA repair processes using comet assay modifications. Though children with Type 1 diabetes demonstrated increased oxidative stress (lower SOD and GSH when compared with healthy children), their oxidative DNA damage (measured as DNA strand breaks) were not substantially altered compared with normals. On the other hand, their DNA repair capacity was significantly increased. This demonstrates a stimulated DNA repair process that is most certainly a response to the permanently elevated state of oxidative stress. Owing to the presented results, it is appropriate to ponder the increased influence of oxidative stress on children with Type 1 diabetes and to take into account this fact when considering their treatment.
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Affiliation(s)
- Jana Varvarovská
- Department of Pediatrics, Charles University Hospital-Plzen, Alej Svobody 80, 304-60 Plzen, Czech Republic.
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20
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Kedziora-Kornatowska K, Szram S, Kornatowski T, Szadujkis-Szadurski L, Kedziora J, Bartosz G. Effect of vitamin E and vitamin C supplementation on antioxidative state and renal glomerular basement membrane thickness in diabetic kidney. Nephron Clin Pract 2004; 95:e134-43. [PMID: 14694267 DOI: 10.1159/000074840] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2002] [Accepted: 08/05/2003] [Indexed: 11/19/2022] Open
Abstract
The aim of this study was to analyze the effect of vitamins C and E on malondialdehyde (MDA) content and activities of key antioxidant enzymes: superoxide dismutase (SOD), catalase (CAT), and glutathione peroxidase (GSH-Px) as well as glomerular basement membrane (GBM) thickness in streptozotocin-induced diabetic kidney in rats. Wistar male rats were divided into following groups (12 rats each): the control, diabetic rats, diabetic rats whose drinking water was supplemented with vitamin C in a dose of 1.0 g/l or diet was supplemented with 200 mg of vitamin E/100 g fodder. Body weight, blood glucose and HbA1C levels and 24-hour urinary albumin excretion (UAE) were studied every week (0-12 weeks). After 6 and 12 weeks, MDA content and activities of SOD, CAT and GSH-Px were measured in the kidney homogenate supernatants. Electron micrographs of glomeruli were scanned and morphometric investigations were performed by means of computer image analysis system to compare GBM thickness. The blood glucose and HbA1C concentrations and UAE in diabetic rats were significantly higher than in the control group. An increase in the MDA level and decrease in the SOD, CAT and GSH-Px activities in the kidney of diabetic rats were observed after 6 and 12 weeks of experiment. Administration of vitamins C and E did not affect body weight, blood glucose and HbA1C levels. Both vitamin C and vitamin E decreased lipid peroxidation and augmented the activities of antioxidant enzymes studied in the kidneys of diabetic rats as well as reduced UAE, decreased kidney weight and GBM thickness. The results indicate the potential utility of antioxidant vitamins in the protection against the development of diabetic nephropathy.
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Affiliation(s)
- K Kedziora-Kornatowska
- Department and Clinics of Geriatrics, L. Rydygier Medical University of Bydgoszcz, Poland.
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21
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Salardi S, Zucchini S, Elleri D, Grossi G, Bargossi AM, Gualandi S, Santoni R, Cicognani A, Cacciari E. High glucose levels induce an increase in membrane antioxidants, in terms of vitamin E and coenzyme Q10, in children and adolescents with type 1 diabetes. Diabetes Care 2004; 27:630-1. [PMID: 14747266 DOI: 10.2337/diacare.27.2.630] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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22
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Cowell RM, Russell JW. Nitrosative Injury and Antioxidant Therapy in the Management of Diabetic Neuropathy. J Investig Med 2004. [DOI: 10.1177/108155890405200124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Strong evidence implicates oxidative stress as a mediator of diabetes-induced microvascular complications, including distal symmetric polyneuropathy. Dorsal root ganglia neurons are particularly susceptible to glucose-mediated oxidative stress and die by apoptotic mechanisms in animal and cell culture models of diabetes. Key mediators of glucose-induced oxidative injury are superoxide anions and nitric oxide (NO). Superoxides are believed to underlie many of the oxidative changes in hyperglycemic conditions, including increases in aldose reductase and protein kinase C activity. Superoxides can also react with NO, forming peroxynitrite (ONOO-), which rapidly causes protein nitration or nitrosylation, lipid peroxidation, deoxyribonucleic acid (DNA) damage, and cell death. ONOO- formation is dependent on both superoxide and NO concentrations; therefore, cells that constitutively express NO synthase, such as endothelial cells and neurons, may be more vulnerable to ONOO–induced cell death in conditions favoring the production of superoxides. Although NO and ONOO- can cause endothelial and neuronal cell death in vitro, in animal models of diabetes, reductions in endothelial NO production can inhibit vasodilatation and cause nerve ischemia. Therefore, ideal therapeutic approaches should limit the formation of superoxides and ONOO while preventing reductions in vascular NO. Despite strong evidence that oxidative stress is associated with complications of diabetes, including neuropathy, the results of clinical trials of antioxidants have shown some promise but not established therapeutic efficacy. Clinical studies of several antioxidants, including α-lipoic acid, vitamins C and E, aldose reductase inhibitors, and growth factors, in diabetic neuropathy are discussed.
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Affiliation(s)
- Rita M. Cowell
- Department of Neurology, University of Michigan, Ann Arbor, MI
| | - James W. Russell
- Department of Neurology, University of Michigan, Ann Arbor, MI
- Department of Neurology Ann Arbor Veterans Administrative Medical Center, Ann Arbor, MI
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23
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Kauffman LD, Sokol RJ, Jones RH, Awad JA, Rewers MJ, Norris JM. Urinary F2-isoprostanes in young healthy children at risk for type 1 diabetes mellitus. Free Radic Biol Med 2003; 35:551-7. [PMID: 12957647 DOI: 10.1016/s0891-5849(03)00333-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Oxidative stress has been linked to many diseases, but little information exists on biomarkers of oxidative stress in healthy children. The purpose of this study was to describe factors that correlate with urinary F2-isoprostanes, an indicator of oxidative stress, and to establish normal concentrations of F2-isoprostanes in children at risk to develop type 1 diabetes mellitus. Creatinine-adjusted urinary F2-isoprostanes were assessed in 342 Denver children under the age of 7 years, from whom we had collected data during 769 clinic visits from August 1997 through January 2001 (mean 2.3 visits per child). Children were identified by newborn screening for HLA-markers, of varying degrees of prediction, for the development of type 1 diabetes. Plasma antioxidants and carotenoids, age at clinic visit, vitamin supplement use, exposure to environmental tobacco smoke, gender, and race were evaluated as correlates to the degree of oxidative stress, using mixed models for longitudinal data. F2-isoprostane levels were highest in infancy and decreased nonlinearly until 7 years. Female gender, HLA-DR3/4 genotype, higher plasma gamma-tocopherol:total lipids ratio, and lower alpha-carotene:total lipids ratio correlated with higher F2-isoprostane levels. Normal values in this healthy population can be used as the basis for future studies of disease mechanisms involving oxidative stress.
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Affiliation(s)
- Laura D Kauffman
- Department of Preventive Medicine and Biometrics, University of Colorado Health Sciences Center, Denver, CO 80262, USA
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24
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Memisoğullari R, Taysi S, Bakan E, Capoglu I. Antioxidant status and lipid peroxidation in type II diabetes mellitus. Cell Biochem Funct 2003; 21:291-6. [PMID: 12910484 DOI: 10.1002/cbf.1025] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Diabetes Mellitus (DM), a state of chronic hyperglycaemia, is a common disease affecting over 124 million individuals worldwide. In this study, erythrocyte glutathione levels, lipid peroxidation, superoxide dismutase, catalase, and glutathione peroxidase and some extracellular antioxidant protein levels of patients with type II diabetes mellitus and healthy controls were investigated. Thirty-eight patients (21 males; with age of mean +/- SD, 53.1+/-9.7 years) and 18 clinically healthy subjects (10 males; with age of mean +/- SD, 49.3+/-15.2 years) were included in the study. Levels of erythrocyte lipid peroxidation, serum ceruloplasmin and glucose levels, HbA1C levels, and erythrocyte catalase activity were significantly increased, whereas serum albumin and transferrin levels, erythrocyte glutathione levels, and glutathione peroxidase activity were significantly decreased compared to those of controls. There was no significant difference in superoxide dismutase activity compared to controls. The results suggest that the antioxidant deficiency and excessive peroxide-mediated damage may appear in non-insulin dependent diabetes mellitus.
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25
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Mahdi AA, Chandra A, Singh RK, Shukla S, Mishra LC, Ahmad S. Effect of herbal hypoglycemic agents on oxidative stress and antioxidant status in diabetic rats. Indian J Clin Biochem 2003; 18:8-15. [PMID: 23105386 PMCID: PMC3453893 DOI: 10.1007/bf02867361] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
In the present study the antioxidative potential ofMomordica charantia, Azadirachta indica, Allium sativum andOcimum sanctum was assessed in streptozotocin induced diabetic rats. Lipid peroxide levels were also measured in normal, diabetic and treated animals. Malondialdehyde (MDA) levels were significantly higher and antioxidant activity was found low in diabetic groups as compared to the control groups, and significant alteration in both the MDA levels and antioxidant activity was also observed when the above herbal hypoglycemic agents were given to diabetic rats. On the basis of our results we conclude thatM. charantia, A. indica, A. sativum andO. sanctum are not only useful in controlling the lipid peroxide levels but are also helpful in further strengthening the antioxidant potential.
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Affiliation(s)
- Abbas Ali Mahdi
- Department of Biochemistry, C.S.M. Medical University (upgraded King George's Medical College), 226003 Lucknow, U.P. India
| | - Anu Chandra
- Faculty of Life Sciences, C.S.J.M. University, Kanpur
- Department of Pharmacology, State Govt. T.T. College, Lucknow, U.P. India
- Department of Biochemistry, C.S.M. Medical University (upgraded King George's Medical College), 226003 Lucknow, U.P. India
| | - Raj Kumar Singh
- Faculty of Life Sciences, C.S.J.M. University, Kanpur
- Department of Pharmacology, State Govt. T.T. College, Lucknow, U.P. India
- Department of Biochemistry, C.S.M. Medical University (upgraded King George's Medical College), 226003 Lucknow, U.P. India
| | - Sanjeev Shukla
- Faculty of Life Sciences, C.S.J.M. University, Kanpur
- Department of Pharmacology, State Govt. T.T. College, Lucknow, U.P. India
- Department of Biochemistry, C.S.M. Medical University (upgraded King George's Medical College), 226003 Lucknow, U.P. India
| | - L. C. Mishra
- Faculty of Life Sciences, C.S.J.M. University, Kanpur
| | - Sohail Ahmad
- Department of Pharmacology, State Govt. T.T. College, Lucknow, U.P. India
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26
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Martín-Gallán P, Carrascosa A, Gussinyé M, Domínguez C. Biomarkers of diabetes-associated oxidative stress and antioxidant status in young diabetic patients with or without subclinical complications. Free Radic Biol Med 2003; 34:1563-74. [PMID: 12788476 DOI: 10.1016/s0891-5849(03)00185-0] [Citation(s) in RCA: 248] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The aims of the study were to ascertain the potential role of oxidative stress in the onset of disease-related pathophysiological complications in young type 1 diabetes patients. Indicative parameters of lipoperoxidation, protein oxidation, and changes in antioxidant defense system status were measured in blood samples from 26 young diabetic patients with recently diagnosed (< 6 months) microangiopathy (+DC), 28 diabetic patients without complications (-DC), and 40 healthy age-matched controls (CR). Both diabetic groups presented similar fructosamine and glycated hemoglobin (HbA1c) values. Results showed erythrocyte glutathione peroxidase activity, glutathione content, and plasma beta-carotene to be significantly lower in diabetic patients compared with control subjects, but with no significant differences between -DC and +DC groups. Antioxidant enzyme superoxide dismutase activity was significantly higher in the erythrocytes of diabetic patients independently of the presence of microvascular complications. However, the plasma alpha-tocopherol/total lipids ratio was significantly diminished in +DC group compared with -DC (p =.008). Lipid peroxidation indices measured in plasma included malondialdehyde, lipid hydroperoxides, and lipoperoxides, which were significantly elevated in our diabetic patients regardless of the presence of complications. Evidence of oxidative damage to proteins was shown both through the quantification of plasma protein carbonyl levels, which were significantly higher in -DC (0.61 +/- 0.09 mmol/mg prot), and higher still in the +DC patients (0.75 +/- 0.09 mmol/mg prot) compared with those of controls (0.32 +/- 0.03 mmol/mg prot; p <.01) and immunoblot analysis of protein-bound carbonyls. Additionally, a marked increase in protein oxidation was observed in +DC patients through assessment of advanced oxidation protein products (AOPP) considered to be an oxidized albumin index; AOPP values were significantly higher in +DC than in -DC patients (p <.01) and CR (p <.0001). These results point to oxidatively modified proteins as a differential factor possibly related to the pathogenesis of diabetic complications.
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Affiliation(s)
- Pilar Martín-Gallán
- Biochemistry and Molecular Biology Center, Hospital Universitario Vall d'Hebron, Barcelona, Spain
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27
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Nishikawa Y, Dmochowska B, Madaj J, Xue J, Guo Z, Satake M, Reddy DV, Rinaldi PL, Monnier VM. Vitamin C metabolomic mapping in experimental diabetes with 6-deoxy-6-fluoro-ascorbic acid and high resolution 19F-nuclear magnetic resonance spectroscopy. Metabolism 2003; 52:760-70. [PMID: 12800104 DOI: 10.1016/s0026-0495(03)00069-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Metabolomic mapping is an emerging discipline geared at providing information on a large number of metabolites as a complement to genomics and proteomics. Here we have probed ascorbic acid homeostasis and degradation in diabetes using 6-deoxy-6-fluoro ascorbic acid (F-ASA) and 750 MHz (19)F-nuclear magnetic resonance (NMR) spectroscopy with proton decoupling In vitro, Cu(2+)-mediated degradation of F-ASA revealed the formation of 4 major stable degradation products at 24 hours. However, when normal or diabetics rats were injected with F-ASA intraperitoneally (IP) for 4 days, up to 20 fluorine-labeled compounds were observed in the urine. Their composition resembled, in part, metal catalyzed degradation of F-ASA and was not explained by spontaneous degradation in the urine. Diabetes led to a dramatic increase in urinary F-ASA loss and a relative decrease in most other urinary F-compounds. Diabetes tilted F-ASA homeostasis toward oxidation in liver (P <.01), kidney (P <.01), spleen (P <.01), and plasma (P <.01), but tended to decrease oxidation in brain, adrenal glands, and heart. Surprisingly, however, besides the major oxidation product fluoro-dehydroascorbic acid (F-DHA), no F-ASA advanced catabolites were detected in tissues at 5 micromol/L sensitivity. These findings not only confirm the key role of the kidney in diabetes-mediated loss of ascorbic acid, but demonstrate that only selected tissues are prone to increased oxidation in diabetes. While the structure of most degradation products needs to be established, the method illustrates the power of high resolution (19)F-NMR spectroscopy for the mapping of complex metabolomic pathways in disease states.
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Affiliation(s)
- Yoko Nishikawa
- Institute of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA
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Dogru Pekiner B, Daş Evcimen N, Ulusu NN, Bali M, Karasu C. Effects of vitamin E on microsomal Ca(2+) -ATPase activity and calcium levels in streptozotocin-induced diabetic rat kidney. Cell Biochem Funct 2003; 21:177-82. [PMID: 12736908 DOI: 10.1002/cbf.1016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Vitamin E treatment has been found to be beneficial in preventing or reducing diabetic nephropathy. Increased tissue calcium and abnormal microsomal Ca(2+)-ATPase activity have been suggested as contributing factors in the development of diabetic nephropathy. This study was undertaken to test the hypothesis that vitamin E reduces lipid peroxidation and can prevent the abnormalities in microsomal Ca(2+)-ATPase activity and calcium levels in kidney of streptozotocin (STZ)-induced diabetic rats. Male rats were rendered diabetic by a single STZ injection (55 mg x kg(-1) i.p.). After diabetes was verified, diabetic and age-matched control rats were untreated or treated with vitamin E (400-500 IU kg(-1) x day(-1), orally) for 10 weeks. Ca(2+)-ATPase activity and lipid peroxidation (MDA) were determined spectrophotometrically. Blood glucose levels increased approximately five-fold (> 500 mg x dl(-1)) in untreated-diabetic rats but decreased to 340+/-27 mg x dl(-1) in the vitamin E treated-diabetic group. Kidney MDA levels did not significantly change in the diabetic state. However, vitamin E treatment markedly inhibited MDA levels in both control and diabetic animals. Ca(2+)-ATPase activity was 0.483+/-0.008 U l(-1) in the control group and significantly increased to 0.754+/-0.010 U l(-1) in the STZ-diabetic group (p < 0.001). Vitamin E treatment completely prevented the diabetes-induced increase in Ca(2+)-ATPase activity (0.307+/-0.025 U l(-1), p < 0.001) and also reduced the enzyme activity in normal control rats. STZ-diabetes resulted in approximately two-fold increase in total calcium content of kidney. Vitamin E treatment led to a significant reduction in kidney calcium levels of both control and diabetic animals (p < 0.001). Thus, vitamin E treatment can lower blood glucose and lipid peroxidation, which in turn prevents the abnormalities in kidney calcium metabolism of diabetic rats. This study describes a potential biochemical mechanism by which vitamin E supplementation may delay or inhibit the development of cellular damage and nephropathy in diabetes.
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Varvarovská J, Racek J, Stozický F, Soucek J, Trefil L, Pomahacová R. Parameters of oxidative stress in children with Type 1 diabetes mellitus and their relatives. J Diabetes Complications 2003; 17:7-10. [PMID: 12505749 DOI: 10.1016/s1056-8727(01)00228-8] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Oxidative stress (OS) plays an important role in the pathogenesis of Type 1 diabetes mellitus (DM). The aim of the study was to compare OS parameters in diabetic children and their first-degree relatives. Fifty diabetic children from the West Bohemian Region were examined as well as their 32 siblings (12 Boys and 20 girls) and 65 of their parents during a period of 6 months. Thirty healthy sex- and age-matched children studied before planned surgeries were normal controls for children, 40 healthy adult volunteers were controls for parents. OS parameters were evaluated in all participants of the study (superoxide dismutase, SOD; glutathione peroxidase, GSHPx; plasma antioxidant capacity, AOC; reduced glutathione, GSH; and malondialdehyde, MDA) and also Type 1 DM-associated antibodies (ICA and GADA). The results in diabetic children showed significantly lower GSHPx and AOC and increased MDA when compared with healthy children. Similar findings were found in their siblings but without statistical significance. It is consequently evident that decreased antioxidative protection and simultaneous free radical (FR) overproduction occur in diabetic children and that there is a similar, but not significant, tendency in their siblings. The findings warrant reducing OS in diabetic children and postponing disease onset in susceptible relatives.
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Affiliation(s)
- Jana Varvarovská
- Pediatric Clinic, Charles University Hospital, E. Benese 13, 305 99, Plzen, Czech Republic.
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Lee DM, Hoffman WH, Carl GF, Khichi M, Cornwell PE. Lipid peroxidation and antioxidant vitamins prior to, during, and after correction of diabetic ketoacidosis. J Diabetes Complications 2002; 16:294-300. [PMID: 12126788 DOI: 10.1016/s1056-8727(01)00215-x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Oxidative stress plays an important role in the chronic complications of insulin-dependent diabetes mellitus (IDDM). Hyperketonemia, as well as hyperglycemia, is involved in the generation of oxygen-free radicals. We have studied the degree of oxidative stress in six patients before, during, and after correction of diabetic ketoacidosis (DKA) by determining the plasma ratios of C20 and C18 fatty acids to C16 fatty acids in the cholesteryl esters of the lipoproteins as well as in the plasma concentrations of the antioxidant vitamins A, C, and E. Lipid peroxidation was slightly increased prior to treatment. However, the C20/C16 ratio at 120 h was significantly decreased in comparison to the ratio at pretreatment (P<.025), at 6-8 h (P<.005), and at 24 h (P<.025). The C18/16 ratio at 120 h was also decreased in comparison to the ratio at 6-8 h (P<.025), indicating an increase in lipid peroxidation after correction of DKA. Vitamin A was below normal at pretreatment and was increased at 120 h (P<.05). Vitamin C was normal at pretreatment and decreased to low normal at 24 h (P<.005). Vitamin E was normal at pretreatment and decreased to below normal at 24 and 120 h, although the changes were not statistically significant. These data demonstrate that there is an increase in lipid peroxidation after the correction of DKA and therefore support the position that administering antioxidant vitamins during the treatment of DKA could be beneficial in minimizing oxidative stress and possibly both the acute and chronic complications of IDDM.
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Affiliation(s)
- Diana M Lee
- Department of Obstetrics and Gynecology, University of Oklahoma Health Sciences Center, Lipid and Lipoprotein Laboratory, Oklahoma Medical Research Foundation, Oklahoma City, OK, USA
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Melhem MF, Craven PA, Liachenko J, DeRubertis FR. Alpha-lipoic acid attenuates hyperglycemia and prevents glomerular mesangial matrix expansion in diabetes. J Am Soc Nephrol 2002; 13:108-116. [PMID: 11752027 DOI: 10.1681/asn.v131108] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Previous studies demonstrated that 2 mo of dietary supplementation with alpha-lipoic acid (LA) prevented early glomerular injury in non-insulin-treated streptozotocin diabetic rats (D). The present study examined the effects of chronic LA supplementation (30 mg/kg body wt per d) on nephropathy in D after 7 mo of diabetes. Compared with control rats, D developed increased urinary excretion of albumin and transforming growth factor beta, renal insufficiency, glomerular mesangial matrix expansion, and glomerulosclerosis in association with depletion of glutathione and accumulation of malondialdehyde in renal cortex. LA prevented or ameliorated all of these changes in D. Because chronic LA supplementation also attenuated hyperglycemia in D after 3 mo, its effects on renal injury were compared with treatment of rats with sufficient insulin to maintain a level of glycemic control for the entire 7-mo period (D-INS) equivalent to that observed with LA during the final 4 mo. Despite superior longitudinal glycemic control in D-INS, urinary excretion of albumin and transforming growth factor beta, glomerular mesangial matrix expansion, the extent of glomerulosclerosis, and renal cortical malondialdehyde content were all significantly greater, whereas cortical glutathione content was lower than corresponding values in D given LA. Thus, the renoprotective effects of LA in D were not attributable to improved glycemic control alone but also likely reflected its antioxidant activity. The combined antioxidant and hypoglycemic actions of LA both may contribute to its utility in preventing renal injury and other complications of diabetes.
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Affiliation(s)
- Mona F Melhem
- Departments of *Pathology and Medicine, VA Pittsburgh Healthcare System and University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Patricia A Craven
- Departments of *Pathology and Medicine, VA Pittsburgh Healthcare System and University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Julia Liachenko
- Departments of *Pathology and Medicine, VA Pittsburgh Healthcare System and University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Frederick R DeRubertis
- Departments of *Pathology and Medicine, VA Pittsburgh Healthcare System and University of Pittsburgh, Pittsburgh, Pennsylvania
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Finotti P, Pagetta A, Ashton T. The oxidative mechanism of heparin interferes with radical production by glucose and reduces the degree of glycooxidative modifications on human serum albumin. EUROPEAN JOURNAL OF BIOCHEMISTRY 2001; 268:2193-200. [PMID: 11298735 DOI: 10.1046/j.1432-1327.2001.02134.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Among substances which may prove useful in preventing or reducing the progression of glycooxidative modifications of proteins, heparin plays a unique role. To elucidate the mechanism whereby heparin may favourably influence the protein structure during glycation, human serum albumin (HSA) was glycated with both 25 and 50 mM glucose in the absence and presence of 12 microg.mL(-1) low-molecular-mass heparin. Glycation caused: (a) modifications of fluorescence emission and excitation spectra consistent with the covalent attachment of glucose to protein; (b) a significant increase in the esterase activity of HSA on p-nitrophenyl acetate; (c) a reduced susceptibility to tryptic digestion and (d) enhanced formation of high-molecular mass aggregates of HSA. These alterations were accompanied by oxidative reactions, as the EPR spectra showed a clear-cut radical signal, dependent on glucose concentration, further confirmed by measurement of the carbonyl content of HSA, as an indirect proof of oxidative damage. In the presence of heparin all the above alterations, especially at 25 mM glucose, turned out to be antagonized. The effects of heparin were dependent on its specific binding to HSA, which triggered an oxidative mechanism strikingly different from that caused by glucose. In the presence of heparin, only the radical species catalyzed by heparin was detected across all samples of glycated HSA, irrespective of glucose concentration. In addition, at 25 mM glucose, enhancement of the oxidative capacity of heparin was also observed. The results demonstrate that the oxidative mechanism sustained by heparin mediates biological effects that may be beneficial in reducing the extent of glycooxidative damage on HSA.
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Affiliation(s)
- P Finotti
- Department of Pharmacology and Anaesthesiology, University of Padova, Italy.
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Melhem MF, Craven PA, Derubertis FR. Effects of dietary supplementation of alpha-lipoic acid on early glomerular injury in diabetes mellitus. J Am Soc Nephrol 2001; 12:124-133. [PMID: 11134258 DOI: 10.1681/asn.v121124] [Citation(s) in RCA: 79] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Antioxidants, in particular vitamin E (VE), have been reported to protect against diabetic renal injury. alpha-Lipoic acid (LA) has been found to attenuate diabetic peripheral neuropathy, but its effects on nephropathy have not been examined. In the present study, parameters of glomerular injury were examined in streptozotocin diabetic rats after 2 mo on unsupplemented diets and in diabetic rats that received the lowest daily dose of dietary LA (30 mg/kg body wt), VE (100 IU/kg body wt), or vitamin C (VC; 1 g/kg body wt), which detectably increased the renal cortical content of each antioxidant. Blood glucose values did not differ among the diabetic groups. At 2 mo, inulin clearance, urinary albumin excretion, fractional albumin clearance, glomerular volume, and glomerular content of immunoreactive transforming growth factor-beta (TGF-beta) and collagen alpha1 (IV) all were significantly increased in unsupplemented D compared with age-matched nondiabetic controls. With the exception of inulin clearance, LA prevented or significantly attenuated the increase in all of these glomerular parameters in D, as well as the increases in renal tubular cell TGF-beta seen in D. At the dose used, VE reduced inulin clearance in D to control levels but failed to alter any of the other indices of glomerular injury or to suppress renal tubular cell TGF-beta in D. VC suppressed urinary albumin excretion, fractional albumin clearance, and glomerular volume but not glomerular or tubular TGF-beta or glomerular collagen alpha1 (IV) content. LA but not VE or VC significantly increased renal cortical glutathione content in D. These data indicate that LA is effective in the prevention of early diabetic glomerular injury and suggest that this agent may have advantages over high doses of either VE or VC.
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Affiliation(s)
- Mona F Melhem
- Department of Medicine, Veterans Affairs Medical Center and University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Patricia A Craven
- Department of Pathology, Veterans Affairs Medical Center and University of Pittsburgh, Pittsburgh, Pennsylvania
| | - Frederick R Derubertis
- Department of Pathology, Veterans Affairs Medical Center and University of Pittsburgh, Pittsburgh, Pennsylvania
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Kim SS, Gallaher DD, Csallany AS. Vitamin E and probucol reduce urinary lipophilic aldehydes and renal enlargement in streptozotocin-induced diabetic rats. Lipids 2000; 35:1225-37. [PMID: 11132182 DOI: 10.1007/s11745-000-0639-2] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Diabetes mellitus is characterized by complications affecting several organs, including the kidney. Lipid peroxidation increases in diabetes and has been implicated in the pathogenesis of diabetic complications. In this study, we examined the ability of two antioxidants, vitamin E and probucol, to reduce lipid peroxidation in vivo and renal hypertrophy, an early stage of diabetic nephropathy, in rats. Animals were divided into four groups: non-diabetic, diabetic, diabetic treated with vitamin E, and diabetic treated with probucol. Animals were given antioxidants by intraperitoneal injection after induction of diabetes by streptozotocin injection. After 7 wk, lipid peroxidation in vivo was measured by analyzing urinary excretion of lipophilic aldehydes and related carbonyl compounds (LACC) as 2,4-dinitrophenylhydrazones by high-performance liquid chromatography. A number of urinary lipophilic nonpolar and polar aldehydes and related carbonyl compounds were identified, almost all of which increased in diabetes. Antioxidant treatment resulted in significantly decreased excretion of urinary LACC excretion. Antioxidant treatment of diabetic rats reduced renal hypertrophy. There was a high correlation between kidney weight and urinary LACC. Since LACC are accepted markers of lipid peroxidation, these results indicate that antioxidants can reduce the elevated lipid peroxidation of diabetes and may slow the onset of diabetic nephropathy.
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Affiliation(s)
- S S Kim
- Department of Food Science and Nutrition, University of Minnesota, St. Paul 55108, USA
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Sharma A, Kharb S, Chugh SN, Kakkar R, Singh GP. Evaluation of oxidative stress before and after control of glycemia and after vitamin E supplementation in diabetic patients. Metabolism 2000; 49:160-2. [PMID: 10690938 DOI: 10.1016/s0026-0495(00)91117-x] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The present study evaluates the presence of oxidative stress in the uncontrolled diabetic state. Glycemic control reduced the oxidative stress, but total normalization of the parameters of oxidative stress was not achieved, indicating continued oxidant injury despite optimal control of the diabetes. Vitamin E supplementation for 4 weeks in these patients further reduced the oxidative stress, suggesting that vitamin E supplementation might be helpful in reducing free-radical-induced oxidant injury.
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Affiliation(s)
- A Sharma
- Postgraduate Institute of Medical Sciences, Rohtak, Haryana, India
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36
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37
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Busbee D, Barhoumi R, Burghardt RC, Gauntt C, McAnalley B, McDaniel HR. Protection from glutathione depletion by a glyconutritional mixture of saccharides. AGE 1999; 22:159-65. [PMID: 23604424 PMCID: PMC3455414 DOI: 10.1007/s11357-999-0018-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A complex glyconutritional (GN) mixture of mono-, di-and polysaccharides was investigated to assess its capacity to protect two different types of rodent cells, rat hepatocytes and mouse splenocytes, from depletion of glutathione by a sulfhydryl-reactive mycotoxin, patulin, or by coxsackievirus B3 (CVB3) infection, respectively. Rat hepatocytes were treated with the GN mixture in vitro or received carrier medium only prior to treatment with patulin. When treated with the GN mixture prior to patulin exposure hepatocytes demonstrated protection against depletion of intracellular reduced glutathione (GSH). Cells treated with the GN for up to 15 hours prior to patulin exposure showed no increase in protection of GSH above that demonstrated by cells treated for 3 hours. Mice were infected with CVB3 and one treatment group was injected intraperitoneally with the GN once a week. Animals were splenectomized each month over a ten month treatment for analysis of spleen monocytic cells. Splenocytes from mice treated with the GN mixture did not show the virally-associated depletion of intracellular GSH or damage to pancreatic acini observed in CVB3 inoculated but non-GN-treated mice. Animals from which spleen cells were taken for analysis showed no decrease in anti-CVB3 antibodies and no decrease in viral titers to accompany or explain the normal levels of intracellular GSH. These data strongly suggest that a complex mixture of exogenous saccharides exerts a protective effect on liver cells in vitro in that the cells are protected from chemically initiated depletion of intracellular GSH, and on spleen cells in vivo in that the cells are protected against a CVB3-initiated decrease in intracellular GSH and increase in pancreatic acini damage.
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Pirisi M, Federico E, Bortolotti N, Fabris C, Falleti E, Soardo G, Gonano F, Bartoli E. Effect of eating on plasma radical-trapping antioxidant activity (TRAP) in patients with cirrhosis. Clin Biochem 1999; 32:447-53. [PMID: 10667480 DOI: 10.1016/s0009-9120(99)00039-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVES To ascertain the effects of eating on plasma antioxidant capacity in patients with liver disease. DESIGN AND METHODS Eighteen cirrhotic patients were compared to 18 age and sex-matched controls. TRAP was measured by a fluorometric assay after a 12 h fast, and 60, 120, and 180 min after the study participants had taken a drink formula food. RESULTS In the fasting state, TRAP was higher in patients with alcoholic cirrhosis (847+/-39 micromol/L, mean +/- SEM) in comparison to patients with viral cirrhosis (653+/-41) and to controls (758+/-26) (p<0.005). In cirrhotic patients, TRAP did not change in the post-absorptive state. In controls, TRAP decreased progressively, to a value of 719+/-21 (p<0.02), and the AUC of the delta-values of TRAP and of plasma insulin showed an inverse correlation (r = -0.52, p<0.05). CONCLUSIONS In normal subjects, but not in cirrhotics, TRAP decreases in the post-absorptive state, probably in relationship with the activation of metabolic pathways.
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Affiliation(s)
- M Pirisi
- Dipartimento di Patologia e Medicina Sperimentale e Clinica, Università degli Studi, Udine, Italy.
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Ağar A, Yargiçoğlu P, Edremitlioğlu M, Kara C, Oğuz Y. The effect of cadmium (Cd) treatment on somatosensory evoked potentials (SEPs) and conduction velocity in alloxane-induced diabetic rats: relation to lipid peroxidation. J Basic Clin Physiol Pharmacol 1999; 10:41-56. [PMID: 10392315 DOI: 10.1515/jbcpp.1999.10.1.41] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Fifty-two healthy Swiss male albino rats, aged three months, were divided into four groups: Control (C), diabetic (D), cadmium (Cd), and diabetic + Cd (D+Cd). Diabetes was induced in D and D+Cd groups by administration of alloxane (5 mg/100 g). Cd and D+Cd groups were injected with CdCl2 i.p. (2 mg/kg/week) for 2 months. Somatosensory evoked potentials (SEPs) of the four groups were recorded following left posterior tibial nerve (PTN) stimulation. The mean latencies of P1, N1, P2 and N2 components were prolonged in all experimental groups compared with the control group. P1N1 and N1P2 amplitudes were significantly decreased in Cd and D+Cd groups in comparison with the control group. P2N2 amplitude was significantly decreased in the Cd group compared with the control group. In addition, conduction velocities and action potential amplitudes were determined from the sciatic nerves. The means of peripheral conduction velocities and action potential amplitudes were decreased significantly in all the experimental groups in comparison with the control group. Thiobarbituric acid reactive substances (TBARS), an indicator of lipid peroxidation, were increased in the kidneys and sciatic nerves of all experimental groups compared with the control group. A significant increase in the TBARS level of the brain was found in the Cd and D+Cd groups.
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Affiliation(s)
- A Ağar
- Department of Physiology, Akdeniz University, Antalya, Turkey
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Will JC, Ford ES, Bowman BA. Serum vitamin C concentrations and diabetes: findings from the Third National Health and Nutrition Examination Survey, 1988-1994. Am J Clin Nutr 1999; 70:49-52. [PMID: 10393138 DOI: 10.1093/ajcn/70.1.49] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Previous studies suggested that diabetes mellitus may lower serum vitamin C concentrations, but most of these studies used clinic-based populations with established diabetes of varying duration and did not adjust for important covariates. OBJECTIVE Using a population-based sample and adjusting for important covariates, we asked whether serum vitamin C concentrations in persons with newly diagnosed diabetes differed from those in persons without diabetes. DESIGN Data were obtained from the third National Health and Nutrition Examination Survey (1988-1994). Serum vitamin C was assayed by using reversed-phase HPLC with multiwavelength detection. Diabetes status (n = 237 persons with diabetes; n = 1803 persons without diabetes) was determined by oral-glucose-tolerance testing of the sample aged 40-74 y. RESULTS After adjustment for age and sex, mean serum vitamin C concentrations were significantly lower in persons with newly diagnosed diabetes than in those without diabetes. After adjustment for dietary intake of vitamin C and other important covariates, however, mean concentrations did not differ according to diabetes status. CONCLUSION When assessing serum vitamin C concentrations by diabetes status in the future, researchers should measure and account for all factors that influence serum vitamin C concentrations.
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Affiliation(s)
- J C Will
- Division of Nutrition and Physical Activity, National Center for Chronic Disease Prevention and Health Promotion, Centers for Disease Control and Prevention, Atlanta, GA 30341, USA.
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Rodríguez-Morán M, Guerrero-Romero F. Increased levels of C-reactive protein in noncontrolled type II diabetic subjects. J Diabetes Complications 1999; 13:211-5. [PMID: 10616861 DOI: 10.1016/s1056-8727(99)00047-1] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Type II diabetes is an hemorheological disease in which hyperglycemia increases the shear stress contributing to inflammation and dysfunction of endothelium. The purpose of this study was to identify the relationship between serum C-reactive protein and glucose levels in noncontrolled type II diabetic subjects. A cross-sectional study was conducted, including 62 noncontrolled type II diabetic subjects that were assigned to two groups. One group was patients with acute diarrhea or urinary tract infection and the other group was diabetic subjects who were infectious-disease free. Sixty-two subjects without diabetes constituted the respective control groups. Heart failure, other acute febrile illnesses, asymptomatic infection, renal, hepatic, malignant or chronic inflammatory illness, and macrovascular disease were considered as exclusion criteria. Laboratory measurements were performed. Thirty (96.7%) and 29 (93.5%) diabetic patients in the groups with and without infectious disease, and 28 (90.3%) control subjects with infectious disease had elevated C-reactive protein levels (> or =10 mg/L). In contrast, healthy control subjects did not have elevated serum C-reactive protein levels. Multiple regression analysis showed a significant association between C-reactive protein levels and hyperglycemia (Odds ratio = 7.4; IC95% 2.3-11.2). This study show that hyperglycemia is a related factor to the increase of serum CRP levels in noncontrolled type II diabetic subjects.
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Affiliation(s)
- M Rodríguez-Morán
- General Hospital of the Mexican Social Security Institute, Durango, México
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Henriksen JE, Andersen CB, Hother-Nielsen O, Vaag A, Mortensen SA, Beck-Nielsen H. Impact of ubiquinone (coenzyme Q10) treatment on glycaemic control, insulin requirement and well-being in patients with Type 1 diabetes mellitus. Diabet Med 1999; 16:312-8. [PMID: 10220205 DOI: 10.1046/j.1464-5491.1999.00064.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
AIM To investigate the effect of ubiquinone (coenzyme Q10) on glycaemic control and insulin requirement in patients with Type 1 diabetes mellitus (DM). METHODS We investigated 34 patients with Type 1 DM in a randomized, double-blind, placebo-controlled study. Patients received either 100 mg Q10 or placebo daily for 3 months. The insulin doses were adjusted according to patients' home measurements of blood glucose concentrations and reported experience of hypoglycaemia. RESULTS At randomization no differences existed between the Q10 and the placebo groups in age, body mass index (BMI), HbA1c, daily insulin dose or mean daily blood glucose concentration. Serum Q10 concentration increased in the Q10 group (mean +/- SD: 0.9+/-0.2 vs. 2.0+/-1.0 microg/ml, P<0.005), with no change in the placebo group (0.9+/-0.3 vs. 0.9+/-0.3 microg/ml, not significant (NS)). Following intervention no differences existed between the Q10 and the placebo groups regarding HbA1c (7.86+/-0.88 vs. 7.84+/-0.84%), mean daily blood glucose concentrations (8.06+/-1.86 vs. 8.53+/-1.88 mM), mean insulin dose (52.1+/-13.2 vs. 52.6+/-21.4 U), hypoglycaemic episodes (2.0+/-1.8 vs. 2.5+/-2.1 episodes/week), or cholesterol concentrations (4.81+/-0.91 vs. 4.78+/-1.07 mM). Furthermore, no differences existed in the well-being of the patients reported from a visual analogue scale (physical: 0.67+/-0.21 vs. 0.71+/-0.18, psychological: 0.70+/-0.25 vs. 0.73+/-0.24). CONCLUSION Q10 treatment does not improve glycaemic control, nor does it reduce insulin requirement, and it can therefore be taken by patients with Type 1 DM without any obvious risk of hypoglycaemia. No major beneficial or unfavourable effects on the investigated parameters could be demonstrated and no major changes in the sense of well-being occurred in the patients.
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Affiliation(s)
- J E Henriksen
- The Diabetes Research Centre, Department of Endocrinology M, Odense University Hospital, Denmark.
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Papaccio G, Morelli MP, Pisanti FA. Effects of butylated hydroxytoluene (BHT) enriched diet on serum antioxidant activity in pre-and overtly diabetic nod mice. Life Sci 1999; 63:1457-60. [PMID: 9952291 DOI: 10.1016/s0024-3205(98)00412-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Preventive (antioxidant activity) and chain-breaking (total peroxyl radical-trapping parameter) antioxidants in the serum of controls and butylated hydroxytoluene (BHT)-diet enriched nonobese diabetic (NOD) and C57B16/J mice from 5 to 25 weeks of age are measured in this study. A significant decrease in the overall potency of both antioxidant types is demonstrated in NOD untreated controls but not in animals whose diet was BHT-enriched. Therefore, we show that alterations of the antioxidant status in NOD mice is efficaciously counteracted by BHT.
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Affiliation(s)
- G Papaccio
- Institute of Anatomy, School of Medicine, 2nd University of Naples, Italy
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44
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Nawroth PP, Bierhaus A, Vogel GE, Hofmann MA, Zumbach M, Wahl P, Ziegler R. [Non-enzymatic glycation and oxidative stress in chronic illnesses and diabetes mellitus]. MEDIZINISCHE KLINIK (MUNICH, GERMANY : 1983) 1999; 94:29-38. [PMID: 10081287 DOI: 10.1007/bf03044692] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
UNLABELLED New approaches in biochemistry and molecular biology have increased the knowledge on the pathophysiology of chronic diseases as late diabetic complications, Alzheimer's disease, arteriosclerosis and vascular disease by defining the concept of "AGE-formation and oxidative stress." Nonenzymatic glycation, in which reducing sugars are covalently bound to free aminogroups of macromolecules, results in the formation of Advanced Glycation End products (AGEs) which accumulate during aging and at accelerated rate during the course of diabetes. Glycation accompanying oxidation processes support AGE-formation. AGE-formation changes the physicochemical properties of proteins, lipids and nucleic acids. In addition, binding of AGEs to specific surface receptors induces cellular signalling and cell activation. Interaction of AGEs with one of the receptors, RAGE, generates intracellular oxidative stress, which results in activation of the transcription factor NF-kappa B and subsequent gene expression, which might be relevant in late diabetic complications. CONCLUSION Knowledge of the basis molecular mechanisms allows to understand the interplay of different inducers such as redicals, cytokines, AGE-proteins and amyloid-beta-peptids and to define oxidative stress as a "common endpoint" of cell dysfunction. With respect to therapeutic options it is now possible not only to optimize blood glycemic control, but also to design drugs such as AGE-inhibitors and AGE-"cross-link" breakers. In addition patients with chronic disease associated with increased oxidative stress ay benefit from an antioxidant rich (and AGE protein poor?) nutrition.
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Affiliation(s)
- P P Nawroth
- Abteilung Innere Medizin I, Endokrinologie und Stoffwechsel, Universität Heidelberg.
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Kedziora-Kornatowska KZ, Luciak M, Blaszczyk J, Pawlak W. Effect of aminoguanidine on erythrocyte lipid peroxidation and activities of antioxidant enzymes in experimental diabetes. Clin Chem Lab Med 1998; 36:771-5. [PMID: 9853804 DOI: 10.1515/cclm.1998.137] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The effect of aminoguanidine (AG) on the malondialdehyde (MDA) concentration and activities of superoxide dismutase (SOD), catalase and glutathione peroxidase (GSH-Px) in erythrocytes of rats with streptozotocin-induced diabetes was studied. Induction of diabetes resulted in an increase of MDA concentration and decreases of SOD and catalase activities after 6 and 12 weeks. GSH-Px activity increased after 6 weeks and returned to control values after 12 weeks. AG administration did not affect body weight, blood glucose level and HbA1c content in diabetic rats but led to a decrease of MDA concentration and SOD and catalase activities after 12 weeks of treatment, with no significant effect after 6 weeks. AG attenuated the GSH-Px increase after 6 weeks but augmented the activity of this enzyme after 12 weeks. These results confirm the presence of oxidative stress in streptozotocin-induced experimental diabetes and point to the beneficial antioxidant effect of AG.
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Marzatico F, Gaetani P, Tartara F, Bertorelli L, Feletti F, Adinolfi D, Tancioni F, Rodriguez y Baena R. Antioxidant status and alpha1-antiproteinase activity in subarachnoid hemorrhage patients. Life Sci 1998; 63:821-6. [PMID: 9734701 DOI: 10.1016/s0024-3205(98)00338-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The antiproteasic activity of alpha1-antitrypsin (alpha1-AT) is reduced in cases of subarachnoid hemorrhage from ruptured intracranial aneurysm and particularly in patients currently smoking; alpha1-AT is very sensitive to oxidant agents. About 50% of physiological anti-oxidant systemic capacity is represented by Vitamin A, E and C. Plasmatic amounts of alpha1-AT, alpha1-AT Collagenase Inhibitory Capacity (CIC) and levels of vitamin A, vitamin E and vitamin C were analyzed in 39 patients, 26 women and 13 men, operated for intracranial aneurysm; 11 patients with unruptured intracranial aneurysm were considered as controls while 28 patients were included within 12 hours from subarachnoid hemorrhage (SAH). Plasmatic levels of vitamin A and vitamin E were significantly lower (p=0.038 and p=0.0158) in patients suffering SAH than in controls, while no statistically significant differences were found in mean plasmatic vitamin C levels. Level of alpha1-AT was not statistically different in controls and in patients with SAH; however, the activity of alpha1-AT, evaluated as CIC, is significantly reduced in patients with SAH (p=0.019). We have observed that systemic plasmatic levels of vitamins did not significantly differ in relation to smoking habit. Vitamin A and E represent an important defensive system against free radicals reactions. Particularly, vitamin E acts as an antioxidant by scavenging free-radicals. A reduced anti-oxidant status might be related to the higher sensibility of alpha1-AT to oxidative reactions and the activity of alpha1-AT is dependent on the antioxidant capacity of liposoluble vitamins. We can speculate that an acute systemic oxidative stress condition might influence the rupture of intracranial aneurysms.
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Affiliation(s)
- F Marzatico
- Institute of Pharmacology, IRCCS Policlinico S. Matteo, University of Pavia, Italy
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47
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Leinonen JS, Alho H, Harmoinen A, Lehtimäki T, Knip M. Unaltered antioxidant activity of plasma in subjects at increased risk for IDDM. Free Radic Res 1998; 29:159-64. [PMID: 9790518 DOI: 10.1080/10715769800300181] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
Abstract
Evidence suggests that free oxygen radicals are involved in the destruction of islet beta-cells in insulin-dependent diabetes mellitus (IDDM). Therefore, we determined the plasma antioxidant activity in 51 healthy unaffected children and adolescents randomly chosen from a study of beta-cell autoimmunity in schoolchildren in northern Finland. Twenty-two subjects tested positive for one or more IDDM-associated autoantibodies and 9 subjects had at least two of the three antibodies tested (antibodies against islet cells, ICA; glutamic acid decarboxylase, GADA; insulin, IAA). There was no significant association of total plasma antioxidant potential, plasma concentrations of alpha-tocopherol, ascorbic acid, protein thiols, or uric acid with the presence of ICA, GADA, or IAA. A reduced first-phase insulin response to intravenous glucose was also not associated with reduced plasma antioxidant activity. These results indicate that the plasma antioxidant activity is not decreased in subjects at increased risk for IDDM. Furthermore, the results suggest that the clinical onset of IDDM is not preceded by signs of increased systemic oxidative stress in plasma.
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Affiliation(s)
- J S Leinonen
- Medical School, University of Tampere, and Department of Clinical Chemistry, Tampere University Hospital, Finland.
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48
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Ceriello A, Bortolotti N, Crescentini A, Motz E, Lizzio S, Russo A, Ezsol Z, Tonutti L, Taboga C. Antioxidant defences are reduced during the oral glucose tolerance test in normal and non-insulin-dependent diabetic subjects. Eur J Clin Invest 1998; 28:329-33. [PMID: 9615913 DOI: 10.1046/j.1365-2362.1998.00295.x] [Citation(s) in RCA: 148] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Free radical production has been reported to be increased in patients with diabetes mellitus, and it has been suggested that hyperglycaemia may directly contribute to the generation of oxidative stress. The aim of the present study was to evaluate the effects of an acute increase in glycaemia on plasma antioxidant defences. RESULTS During the oral glucose tolerance test (OGTT), plasma concentration of protein-bound sulphydryl (SH) groups, vitamin C, vitamin E and uric acid significantly decreased in normal as well as non-insulin-dependent diabetes mellitus (NIDDM) subjects. Total plasma radical-trapping activity, which evaluates plasma antioxidant capacity due to known and unknown antioxidants present in the plasma as well as their mutual co-operation, was also significantly reduced. CONCLUSION This finding supports the hypothesis that hyperglycaemia may, even acutely, induce an oxidative stress.
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Affiliation(s)
- A Ceriello
- Chair of Internal Medicine, University of Udine, Italy.
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49
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Allen RG. Oxidative stress and superoxide dismutase in development, aging and gene regulation. AGE 1998; 21:47-76. [PMID: 23604352 PMCID: PMC3455717 DOI: 10.1007/s11357-998-0007-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Free radicals and other reactive oxygen species are produced in the metabolic pathways of aerobic cells and affect a number of biological processes. Oxidation reactions have been postulated to play a role in aging, a number of degenerative diseases, differentiation and development as well as serving as subcellular messengers in gene regulatory and signal transduction pathways. The discovery of the activity of superoxide dismutase is a seminal work in free radical biology, because it established that free radicals were generated by cells and because it made removal of a specific free radical substance possible for the first time, which greatly accelerated research in this area. In this review, the role of reactive oxygen in aging, amyotrophic lateral sclerosis (a neurodegenerative disease), development, differentiation, and signal transduction are discussed. Emphasis is also given to the role of superoxide dismutases in these phenomena.
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50
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Willems D, Dorchy H, Dufrasne D. Serum antioxidant status and oxidized LDL in well-controlled young type 1 diabetic patients with and without subclinical complications. Atherosclerosis 1998; 137 Suppl:S61-4. [PMID: 9694543 DOI: 10.1016/s0021-9150(97)00320-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
It has been suggested that oxidative stress may play an important role in the pathogenesis of diabetic complications because hyperglycemia may cause increased production of free radicals. However, studies on the antioxidant status of young type 1 diabetic patients are very scarce as well as the relationships of oxidative stress and the presence of subclinical complications. Therefore, it was decided to evaluate autoantibodies against LDL (o-LAB) and antioxidant status in relationship with glycated hemoglobin levels (HbA1c), lipoproteins and subclinical complications (retinopathy, neuropathy and nephropathy). The study included 110 young type 1 diabetic patients, with a median age of 15 years and a median diabetes duration of 5 years. The mean+/-S.E.M. of HbA1c levels was 7.1+/-0.2%. Subclinical complications were detected in 26 patients. Total antioxidant status (TAS), vitamin A or E were not decreased in the patients and no significant differences were noted between the different subgroups of patients classified according to their subclinical complications. HbA1c levels were not related to antioxidants. Autoantibodies against LDL-lipoproteins decreased with age and diabetes duration, as reported in healthy non diabetic subjects. In conclusion, in the diabetic patients with a more or less good diabetic control, increased lipid peroxidation or reduced lipid antioxidant defense could not be demonstrated, even for the patients with subclinical complications.
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Affiliation(s)
- D Willems
- Department of Clinical Chemistry, Brugmann University Hospital, Brussels, Belgium
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