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Investigation of the Effects of L-carnitine and magnesium on Oxidative Stress and Cytokines in the Tissue of Experimental diabetic rats. ACTA VET-BEOGRAD 2021. [DOI: 10.2478/acve-2021-0039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
The aim of this study was to determine the effects of L-carnitine and magnesium on the levels of tissue malondialdehyde, 8-hydroxy-2’-deoxyguanosine, and cytokines (tumor necrosis factor alpha, interleukin-6) in streptozotocin-induced experimental diabetes in rats. Eighty male Wistar albino rats (200-250 g) were divided into 8 groups with 10 rats in each group. The groups received the following treatments: Control group; 2 ml distilled water (by gavage); Group 2: 50 mg/kg (b.w.) i.p. streptozotocin; Group 3: 125 mg/kg (b.w.) magnesium; Group 4: 300 mg/kg (b.w.) L-carnitine; Group 5: 125 mg/kg (b.w.) magnesium +300 mg/kg (b.w.) L-carnitine; Group 6: 50 mg/kg (b.w.) streptozotocin +125 mg/kg (b.w.) magnesium; Group 7: 50 mg/kg (b.w.) streptozotocin +300 mg/kg (b.w.) L-carnitine and Group 8: 50 mg/kg (b.w.) streptozotocin +125 mg/ kg (b.w.) magnesium+300 mg/kg (b.w.) L-carnitine administered for 4 weeks. Liver and kidney malondialdehyde, 8-hydroxy-2’-deoxyguanosine, tumor necrosis factor alpha and interleukin-6 levels did not change in the magnesium, L-carnitine, and magnesium + L-carnitine groups compared to the control. The highest levels of malondialdehyde, 8-hydroxy-2’-deoxyguanosine, tumor necrosis factor alpha and interleukin-6 were determined only in the group with diabetes (Group 2). Lipid peroxidation, DNA damage, and cytokine levels were significantly reduced in diabetic animals with the administration of magnesium and L-carnitine separately or in combination. Based on the obtained results it can be concluded that magnesium and L-carnitine may have antidiabetic effects, especially in combination.
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Pan G, Deshpande M, Pang H, Stemmer PM, Carruthers NJ, Shearn CT, Backos DS, Palaniyandi SS. 4-Hydroxy-2-nonenal attenuates 8-oxoguanine DNA glycosylase 1 activity. J Cell Biochem 2020; 121:4887-4897. [PMID: 32628320 PMCID: PMC7935017 DOI: 10.1002/jcb.29814] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/18/2020] [Accepted: 05/11/2020] [Indexed: 02/06/2023]
Abstract
Elevated cellular oxidative stress and oxidative DNA damage are key contributors to impaired cardiac function in diabetes. During chronic inflammation, reactive oxygen species (ROS)-induced lipid peroxidation results in the formation of reactive aldehydes, foremost of which is 4-hydroxy-2-nonenal (4HNE). 4HNE forms covalent adducts with proteins, negatively impacting cellular protein function. During conditions of elevated oxidative stress, oxidative DNA damage such as modification by 8-hydroxydeoxyguanosine (8OHdG) is repaired by 8-oxoguanine glycosylase-1 (OGG-1). Based on these facts, we hypothesized that 4HNE forms adducts with OGG-1 inhibiting its activity, and thus, increases the levels of 8OHG in diabetic heart tissues. To test our hypothesis, we evaluated OGG-1 activity, 8OHG and 4HNE in the hearts of leptin receptor deficient db/db mice, a type-2 diabetic model. We also treated the recombinant OGG-1 with 4HNE to measure direct adduction. We found decreased OGG-1 activity (P > .05), increased 8OHG (P > .05) and increased 4HNE adducts (P > .05) along with low aldehyde dehydrogenase-2 activity (P > .05). The increased colocalization of OGG-1 and 4HNE in cardiomyocytes suggest 4HNE adduction on OGG-1. Furthermore, colocalization of 8OHG and OGG-1 with mitochondrial markers TOM 20 and aconitase, respectively, indicated significant levels of oxidatively-induced mtDNA damage and implicated a role for mitochondrial OGG-1 function. In vitro exposure of recombinant OGG-1 (rOGG-1) with increasing concentrations of 4HNE resulted in a concentration-dependent decrease in OGG-1 activity. Mass spectral analysis of trypsin digests of 4HNE-treated rOGG-1 identified 4HNE adducts on C28, C75, C163, H179, H237, C241, K249, H270, and H282. In silico molecular modeling of 4HNE-K249 OGG-1 and 4HNE-H270 OGG-1 mechanistically supported 4HNE-mediated enzymatic inhibition of OGG-1. In conclusion, these data support the hypothesis that inhibition of OGG-1 by direct modification by 4HNE contributes to decreased OGG-1 activity and increased 8OHG-modified DNA that are present in the diabetic heart.
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Affiliation(s)
- Guodong Pan
- Division of Hypertension and Vascular Research, Department of Internal Medicine, Henry Ford Health System, Detroit, MI 48202
| | - Mandar Deshpande
- Division of Hypertension and Vascular Research, Department of Internal Medicine, Henry Ford Health System, Detroit, MI 48202
| | - Haiyan Pang
- Division of Hypertension and Vascular Research, Department of Internal Medicine, Henry Ford Health System, Detroit, MI 48202
| | - Paul M. Stemmer
- Institute of Environmental Health Sciences & Proteomics Facility Core, Wayne State University, Detroit, MI, USA, 48201
| | - Nicholas J Carruthers
- Institute of Environmental Health Sciences & Proteomics Facility Core, Wayne State University, Detroit, MI, USA, 48201
| | - Colin T. Shearn
- Department of Pediatrics Division of Pediatric Gastroenterology, Hepatology and Nutrition, School of Medicine, University of Colorado Anschutz Medical Center, Aurora, CO 80045
| | - Donald S. Backos
- School of Pharmacy, University of Colorado Anschutz Medical Center, Aurora, CO 80045
| | - Suresh Selvaraj Palaniyandi
- Division of Hypertension and Vascular Research, Department of Internal Medicine, Henry Ford Health System, Detroit, MI 48202
- Department of Physiology, Wayne State University, Detroit, MI, 48202
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Mendes-Braz M, Martins JO. Diabetes Mellitus and Liver Surgery: The Effect of Diabetes on Oxidative Stress and Inflammation. Mediators Inflamm 2018; 2018:2456579. [PMID: 29853784 PMCID: PMC5964489 DOI: 10.1155/2018/2456579] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Revised: 04/02/2018] [Accepted: 04/11/2018] [Indexed: 12/11/2022] Open
Abstract
Diabetes mellitus (DM) is a metabolic disorder characterized by hyperglycaemia and high morbidity worldwide. The detrimental effects of hyperglycaemia include an increase in the oxidative stress (OS) response and an enhanced inflammatory response. DM compromises the ability of the liver to regenerate and is particularly associated with poor prognosis after ischaemia-reperfusion (I/R) injury. Considering the growing need for knowledge of the impact of DM on the liver following a surgical procedure, this review aims to present recent publications addressing the effects of DM (hyperglycaemia) on OS and the inflammatory process, which play an essential role in I/R injury and impaired hepatic regeneration after liver surgery.
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Affiliation(s)
- Mariana Mendes-Braz
- Laboratory of Immunoendocrinology, Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences of University Sao Paulo (FCF/USP), São Paulo, SP, Brazil
| | - Joilson O. Martins
- Laboratory of Immunoendocrinology, Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences of University Sao Paulo (FCF/USP), São Paulo, SP, Brazil
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SIRT6 expression and oxidative DNA damage in individuals with prediabetes and type 2 diabetes mellitus. Gene 2017; 642:542-548. [PMID: 29197589 DOI: 10.1016/j.gene.2017.11.071] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Revised: 10/25/2017] [Accepted: 11/28/2017] [Indexed: 12/22/2022]
Abstract
Sirtuins (SIRTs) is a family of NAD+ dependent histone deacetylases. SIRT6 takes play in glucose homeostasis, genomic stability and DNA repair. Although increased oxidative DNA damage and decreased DNA repair activity were determined in diabetes mellitus, the possible relation between level of oxidative DNA damage and SIRT6 expression has not been investigated so far. We determined SIRT6 expression and urinary 8-hydroxy deoxyguanosine (8-OHdG) levels, marker of oxidative DNA damage, in cases with prediabetes (PreDM) and type 2 diabetes mellitus (T2DM). SIRT6 gene expression was determined in peripheral blood leukocytes of 70 patients with type 2 diabetes, 50 cases in prediabetic stage and 40 healthy subjects. SIRT6 mRNA levels were determined by quantitive real time- polymerase chain reaction. SIRT6 protein was detected by immunocytochemical staining. Urinary 8-hydroxy deoxyguanosine (8-OHdG) levels were measured by ELISA. There was no significant difference between groups for SIRT6 mRNA level. SIRT6 immunopositivity in T2DM group was lower when compared to those in preDM group (P<0.05). SIRT6 positive cell number in T2DM and preDM groups were lower in comparison to control group (P<0.01 for both), however, when study groups were subdivided into two groups according to their age, the difference between preDM and control groups disappeared in both mid-aged and old-aged groups. The urinary 8-OHdG level was found to be higher in the T2DM group in comparison to preDM group (P<0.05). When age is taken into consideration, urinary 8-OHdG level in the T2DM group was found to be higher than those in both preDM and control groups in the old-aged cases but no significant difference was determined between groups in the mid-aged cases. There was no relation between SIRT6 expression and urinary 8-OHDG excretion. It was concluded that SIRT6 may take play in development of T2DM but this effect seems to be independent from repair of oxidative DNA damage.
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Usta A, Dede S. The Effect of Thymoquinone on Nuclear Factor Kappa B Levels and Oxidative DNA Damage on Experimental Diabetic Rats. Pharmacogn Mag 2017; 13:S458-S461. [PMID: 29142399 PMCID: PMC5669082 DOI: 10.4103/pm.pm_134_17] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 05/17/2017] [Indexed: 12/19/2022] Open
Abstract
Background: Thymoquinone (TQ), the basic bioactive phytochemical constituent of seed oil of Nigella sativa, is one of these herbal drugs known for antidiabetic effects. This study was carried out to assess the effects of the possible role of TQ on nuclear factor kappa B (NF-κB) and oxidative DNA damage levels in experimental diabetic rats. Materials and Methods: Twenty-eight male Wistar Albino rats (200–250 g) were used as experimental subjects. The rats were divided into four groups, including the control, control supplemented with TQ (CT), diabetic (D), and diabetic supplemented with TQ (DT), each containing seven rats. The D and the DT groups were treated with 45 mg/kg streptozotocin (STZ) (intraperitoneal). TQ was administered 30 mg/kg/day for 21 days by oral gavage in the DT and the T groups. Results: It was determined that glucose, glycosylated hemoglobin (HbA1c) levels and alanine aminotransferase, aspartate aminotransferase, and gamma-glutamyl transpeptidase activities were decreased significantly and approached the control group in the DT group after TQ supplement (P < 0.05). Urea levels were the lowest in CT (P < 0.05). Oxidative DNA damage (8 hydroxy-2-deoxyguanosine) was increased in both of the diabetic groups (D and DT). The NF-κB levels were the highest in Group D (P < 0.05). Conclusion: It was observed that increased glucose and HbA1c levels and the indicators of liver and kidney damages were decreased significantly after TQ supplementation. Oxidative DNA damage and NF-κB levels were increased in the diabetic group, and TQ administration caused a statistically insignificant reduction. SUMMARY In this study, the effects of thymoquinone (TQ), the basic bioactive phytochemical constituent of seed oil of Nigella sativa, on nuclear factor kappa B (NF-κB), oxidative DNA damage levels, and, some biochemical parameters was invesigated. It was observed that some biochemical parameters (glucose, glycosylated hemoglobin (HbA1c), ALT, AST, GGT) were close to the control group after TQ treatment in diabetic group. Oxidative DNA damage (8 hydroxy 2 deoxyguanosine) and NF-κB were highest levels and TQ implementation caused statistically insignificant decrease, in the diabetic group.
Abbreviations used: 8-OHdG: 8 hydroxi-2-deoxiguanosin; ALT: Alanine aminotransferase; AST: Aspartate aminotransferase; GGT: Gamma-glutamyl transpeptidase; HbA1c: Glycosylated hemoglobin; NF-κB: Nuclear factor kappa protein; STZ: Streptozotocin; TQ: Thymoquinone.
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Affiliation(s)
- Ayşe Usta
- Department of Chemistry, Faculty of Science, Yuzuncu Yil University, Van, Turkey
| | - Semiha Dede
- Department of Biochemistry, Yuzuncu Yil University, Faculty of Veterinary Medicine, Van, Turkey
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Sriram S, Subramanian S, Juvvuna PK, McFarlane C, Salerno MS, Kambadur R, Sharma M. Myostatin induces DNA damage in skeletal muscle of streptozotocin-induced type 1 diabetic mice. J Biol Chem 2014; 289:5784-98. [PMID: 24425880 DOI: 10.1074/jbc.m113.483115] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
One of the features of uncontrolled type 1 diabetes is oxidative stress that induces DNA damage and cell death. Skeletal muscle atrophy is also considerable in type 1 diabetes, however, the signaling mechanisms that induce oxidative stress culminating in muscle atrophy are not fully known. Here, we show that in Streptozotocin-induced diabetic wild type mice, hypo-phosphorylation of Akt, resulted in activation of Foxa2 transcription factor in the muscle. Foxa2 transcriptionally up-regulated Myostatin, contributing to exaggerated oxidative stress leading to DNA damage via p63/REDD1 pathway in skeletal muscle of Streptozotocin-treated wild type mice. In Myostatin(-/-) mice however, Streptozotocin treatment did not reduce Akt phosphorylation despite reduced IRS-1 signaling. Moreover, Foxa2 levels remained unaltered in Myostatin(-/-) mice, while levels of p63/REDD1 were higher compared with wild type mice. Consistent with these results, relatively less DNA damage and muscle atrophy was observed in Myostatin(-/-) muscle in response to Streptozotocin treatment. Taken together, our results for the first time show the role of Foxa2 in Myostatin regulation in skeletal muscle in diabetic mice. Altogether, these results demonstrate the mechanism by which Myostatin contributes to DNA damage in skeletal muscle of the diabetic mice that would lead to myofiber degeneration.
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Affiliation(s)
- Sandhya Sriram
- From the Division of Molecular Genetics and Cell Biology, School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551
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Lucchesi AN, Freitas NTD, Cassettari LL, Marques SFG, Spadella CT. Diabetes mellitus triggers oxidative stress in the liver of alloxan-treated rats: a mechanism for diabetic chronic liver disease. Acta Cir Bras 2013; 28:502-8. [DOI: 10.1590/s0102-86502013000700005] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Accepted: 06/24/2013] [Indexed: 01/05/2023] Open
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Chandrasekaran K, Swaminathan K, Kumar SM, Clemens DL, Dey A. Increased oxidative stress and toxicity in ADH and CYP2E1 overexpressing human hepatoma VL-17A cells exposed to high glucose. Integr Biol (Camb) 2012; 4:550-63. [DOI: 10.1039/c2ib00155a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Francés DE, Ronco MT, Ingaramo PI, Monti JA, Pisani GB, Parody JP, Pellegrino JM, Carrillo MC, Martín-Sanz P, Carnovale CE. Role of reactive oxygen species in the early stages of liver regeneration in streptozotocin-induced diabetic rats. Free Radic Res 2011; 45:1143-53. [PMID: 21740310 DOI: 10.3109/10715762.2011.602345] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Diabetes mellitus is a risk factor for prognosis after liver resection. In previous work, we found a pro-apoptotic state in the diabetic rat liver. In this work, this was also observed 1 hour post-partial hepatectomy (PH) and resulted in a deficient regenerative response 24 hours post-PH. Treatment with insulin and/or Desferoxamine (DES) (iron chelator) or Tempol (TEM) (free radicals scavenger) was effective in preventing the liver reactive oxygen species (ROS) production induced by diabetic state. High levels of ROS play a role in hepatic lipid peroxidation in diabetes before and after PH, and lead to increased pro-apoptotic events, which contribute to a reduced regenerative response. This becomes of relevance for the potential use of antioxidants/free radical scavengers plus insulin for improvement of post-surgical recovery of diabetic patients subjected to a PH.
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Affiliation(s)
- Daniel E Francés
- Instituto de Fisiología Experimental (IFISE-CONICET), Suipacha 570, 2000 Rosario, Argentina
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Dey A, Kumar SM. Cytochrome P450 2E1 and hyperglycemia-induced liver injury. Cell Biol Toxicol 2011; 27:285-310. [PMID: 21455816 DOI: 10.1007/s10565-011-9188-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Accepted: 03/03/2011] [Indexed: 12/25/2022]
Abstract
Cytochrome P450 2E1 (CYP2E1), a microsomal enzyme involved in xenobiotic metabolism and generation of oxidative stress, has been implicated in promoting liver injury. The review deals with the changes in various cellular pathways in liver linked with the changes in regulation of CYP2E1 under hyperglycemic conditions. Some of the hepatic abnormalities associated with hyperglycemia-mediated induction of CYP2E1 include increased oxidative stress, changes in mitochondrial structure and function, apoptosis, nitrosative stress, and increased ketone body accumulation. Thus, changes in regulation of CYP2E1 are associated with the injurious effects of hyperglycemia in liver.
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Affiliation(s)
- Aparajita Dey
- Life Science Division, AU-KBC Research Centre, MIT Campus of Anna University, Chromepet, Chennai, India.
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Kobayashi K, Ichi I, Nakagawa T, Kamikawa C, Kitamura Y, Koga E, Washino Y, Hoshinaga Y, Kojo S. Increase in plasma ceramide levels via secretory sphingomyelinase activity in streptozotocin-induced diabetic rats. MEDCHEMCOMM 2011. [DOI: 10.1039/c0md00154f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Karaağaç N, Salman F, Doğru-Abbasoğlu S, Uysal M. Changes in prooxidant-antioxidant balance in tissues of rats following long-term hyperglycemic status. Endocr Res 2011; 36:124-33. [PMID: 21736495 DOI: 10.3109/07435800.2011.566237] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
INTRODUCTION Reactive oxygen species play an important role in the pathogenesis of organ damage in diabetes mellitus. Streptozotosin (STZ) is a commonly employed compound to produce diabetes mellitus and these animals exhibit most of diabetic complications. METHODS In our study, diabetes was induced by a single intraperitoneal injection of STZ at a dose of 50 mg/kg in rats and they were killed 12 weeks after STZ. Endogenous lipid peroxide levels, enzymatic and non-enzymatic antioxidants were measured in liver, heart, kidney, brain, and testis tissues to investigate the effect of long-term hyperglycemic state. The susceptibility of diabetic tissues to oxidative stress was also examined in in vitro oxidizing system containing ascorbic acid and iron. RESULTS We found that prooxidant and antioxidant balance has changed in favor of prooxidation in the tissues of diabetic rats. The susceptibility of liver to oxidative stress increased; however, this susceptibility did not change in heart, kidney, brain, and testis of diabetic rats. CONCLUSION Our results indicate that long-term hyperglycemic state disturbs hepatic prooxidant-antioxidant balance at an earlier period and more pronouncedly than other tissues.
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Affiliation(s)
- Neslihan Karaağaç
- Department of Biochemistry, Istanbul Medical Faculty, Istanbul University, Çapa, Istanbul, Turkey
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Ku YP, Jin M, Kim KH, Ahn YJ, Yoon SP, You HJ, Chang IY. Immunolocalization of 8-OHdG and OGG1 in pancreatic islets of streptozotocin-induced diabetic rats. Acta Histochem 2009; 111:138-44. [PMID: 18676009 DOI: 10.1016/j.acthis.2008.05.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Revised: 05/09/2008] [Accepted: 05/21/2008] [Indexed: 02/05/2023]
Abstract
This study examined whether oxidative DNA damage and its repair system contribute to the occurrence of diabetes in an experimental rat model. The changed morphological findings of the 8-hydroxydeoxyguanosine (8-OHdG) and 8-oxoG-DNA glycosylase (OGG1) were examined in the pancreatic islets in streptozotocin-induced diabetic rats (60 mg/kg, i.p.). The patterns of immunolocalization were mainly observed in the periphery of the normal pancreatic islet: 8-OHdG in the nucleus and OGG1 in the cytoplasm. The altered immunolocalization of 8-OHdG and OGG1 were greatest in the first hours after streptozotocin injection, and then declined in parallel with the morphological observations of pancreatic beta cell destruction. These results suggested that increased oxidative DNA damage might play a role as the inducer of diabetes and that OGG1 may not successfully mediate DNA repair in streptozotocin-induced diabetic rat pancreas.
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Insulin resistance and oxidative stress in familial combined hyperlipidemia. Atherosclerosis 2008; 199:384-9. [DOI: 10.1016/j.atherosclerosis.2007.11.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Revised: 11/01/2007] [Accepted: 11/15/2007] [Indexed: 11/17/2022]
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Vorobeychik M, Bloch K, Zemel R, Bachmetov L, Tur-Kaspa R, Vardi P. Immunohistochemical evaluation of hepatic oval cell activation and differentiation toward pancreatic beta-cell phenotype in streptozotocin-induced diabetic mice. J Mol Histol 2008; 39:463-8. [DOI: 10.1007/s10735-008-9185-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2008] [Accepted: 07/15/2008] [Indexed: 11/28/2022]
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