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Redox Status in Women with Rheumathoid Arthritis. SERBIAN JOURNAL OF EXPERIMENTAL AND CLINICAL RESEARCH 2021. [DOI: 10.2478/sjecr-2018-0047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Abstract
The aim of this study was to assess oxidative status and to set baseline characteristics for female population with established rheumatoid arthritis. Total of 42 patients with rheumatoid arthritis and 48 age- and sex-matched controls were included in the study. Clinical examination was performed and assessed disease activity. Peripheral blood samples were used for all the assays. The markers of oxidative stress were assessed, including plasma levels of index of lipid peroxidation – thiobarbituric acid reactive substances, hydrogen peroxide, superoxide anion radical, nitrites and activity of superoxide dismutase, catalase and reduced glutathione levels as anti-oxidant parameters. In the patients group, levels of hydrogen peroxide and index of lipid peroxidation were higher than in controls. Patients with rheumatoid arthritis had decreased su-peroxide dismutase and catalase activity compared to healthy subjects. Interestingly, controls had higher levels of nitrites compared to patients. Patients showed a marked increase in reactive oxygen species formation and lipid peroxidation as well as decrease in the activity of antioxidant defense system leading to oxidative stress which may contribute to tissue and cartilage damage and hence to the chronicity of the disease.
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Trofimenko AS. Elimination of Nucleoproteins in Systemic Lupus Erythematosus and Antinuclear Autoantibodies Production. Lupus 2017. [DOI: 10.5772/intechopen.68496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Jiang H, Liu J, Wang T, Gao JR, Sun Y, Huang CB, Meng M, Qin XJ. Urinary metabolite profiling provides potential differentiation to explore the mechanisms of adjuvant-induced arthritis in rats. Biomed Chromatogr 2016; 30:1397-405. [PMID: 26856389 DOI: 10.1002/bmc.3697] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 01/25/2016] [Accepted: 02/03/2016] [Indexed: 12/16/2022]
Affiliation(s)
- Hui Jiang
- Department of Pharmacy; The First Affiliated Hospital of Anhui University of Chinese Medicine; 117 Meishan Road Hefei China
- College of Basic Medicine; Anhui Medical University; 81 Meishan Road Hefei China
| | - Jian Liu
- Department of Pharmacy; The First Affiliated Hospital of Anhui University of Chinese Medicine; 117 Meishan Road Hefei China
| | - Ting Wang
- College of Pharmacy; Anhui university of Chinese medicine; 103 Meishan Road Hefei China
| | - Jia-rong Gao
- Department of Pharmacy; The First Affiliated Hospital of Anhui University of Chinese Medicine; 117 Meishan Road Hefei China
| | - Yue Sun
- Department of Pharmacy; The First Affiliated Hospital of Anhui University of Chinese Medicine; 117 Meishan Road Hefei China
| | - Chuan-bing Huang
- Department of Pharmacy; The First Affiliated Hospital of Anhui University of Chinese Medicine; 117 Meishan Road Hefei China
| | - Mei Meng
- Department of Pharmacy; The First Affiliated Hospital of Anhui University of Chinese Medicine; 117 Meishan Road Hefei China
| | - Xiu-juan Qin
- College of Pharmacy; Anhui university of Chinese medicine; 103 Meishan Road Hefei China
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Yang H, Wei Z, Schenerman M. A Statistical Approach to Determining Criticality of Residual Host Cell DNA. J Biopharm Stat 2014; 25:234-46. [DOI: 10.1080/10543406.2014.972514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Alzolibani AA, Rasheed Z, Al Robaee AA. Acquired immunogenicity of DNA after modification with malondialdehyde in patients with alopecia areata. Scandinavian Journal of Clinical and Laboratory Investigation 2014; 74:312-21. [DOI: 10.3109/00365513.2014.889322] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Li Y, Li W, Liu C, Yan M, Raman I, Du Y, Fang X, Zhou XJ, Mohan C, Li QZ. Delivering Oxidation Resistance-1 (OXR1) to Mouse Kidney by Genetic Modified Mesenchymal Stem Cells Exhibited Enhanced Protection against Nephrotoxic Serum Induced Renal Injury and Lupus Nephritis. ACTA ACUST UNITED AC 2014; 4. [PMID: 25995969 PMCID: PMC4435960 DOI: 10.4172/2157-7633.1000231] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
OBJECTIVE To elucidate the role of oxidation resistance 1 (OXR1) gene. Oxidative stress plays a pivotal role in pathogenesis of immune-mediated nephritis. Recently we identified oxidation resistance 1 (OXR1) is conventionally expressed in eukaryotes and has an ability to prevent oxidative damage caused by various oxidative stresses. However the protective effect of OXR1 in immune-associated inflammatory response and oxidative damage is not clear and will be investigated in this study. METHODS We utilized mesenchymal stem cells (MSCs) as vehicles to carry OXR1 into the injured kidneys of nephritis model mice and investigated the influence of OXR1 on glomerulonephritis. Human OXR1 gene was integrated into genome of MSCs via lentiviral vector, and established hOXR1-MSC cell line which still maintains the differentiation property. 129/svj mice with anti-glomerular basement membrane (GBM) challenge and spontaneous lupus mice B6.Sle1.Sle2.Sle3 were injected with hOXR1-MSCs (i.v. injection) to evaluate the function of hOXR1. Immunohistochemistry was used to appraise the renal pathology and Tunel staining was applied to detect cell apoptosis. RESULTS Compared with control mice, hOXR1-MSCs administration showed significantly decreased blood urea nitrogen (BUN), proteinuria and ameliorated renal pathological damage. hOXR1-MSCs transplantation significantly reduced macrophage and T lymphocyte infiltration by inhibiting the expression of CCL2, CCL7, IL-1β, IL-6 and NFκB in mouse kidney. Moreover, hOXR1-MSCs prevented hydrogen peroxide (H2O2)-induced oxidative stress and its implantation reduced nitric oxide (NO) in mouse serum and urine to inhibit tubular cell apoptosis. CONCLUSION OXR1-MSCs transplantation may exert a certain protective effect on nephritis by suppressing inflammation and oxidative stress.
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Affiliation(s)
- Yajuan Li
- Laboratory of Disease Genomics and Individualized Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100029, China ; Department of Immunology and Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Wei Li
- Key Laboratory of Medical Genetics, Wenzhou Medical University School of Laboratory Medicine & Life Science, Wenzhou, 325035, China
| | - Chu Liu
- Key Laboratory of Medical Genetics, Wenzhou Medical University School of Laboratory Medicine & Life Science, Wenzhou, 325035, China
| | - Mei Yan
- Department of Immunology and Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Indu Raman
- Department of Immunology and Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Yong Du
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Xiangdong Fang
- Laboratory of Disease Genomics and Individualized Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, 100029, China
| | - Xin J Zhou
- Renal Path Diagnostics, Pathologist BioMedical Laboratories, Lewisville, TX, 75067, USA
| | - Chandra Mohan
- Department of Biomedical Engineering, University of Houston, Houston, TX, 77204, USA
| | - Quan-Zhen Li
- Key Laboratory of Medical Genetics, Wenzhou Medical University School of Laboratory Medicine & Life Science, Wenzhou, 325035, China ; Department of Immunology and Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
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Rasheed Z, Al-Shobaili HA, Al Robaee AA, Alzolibani AA, Wadi WIA, Khan MI, Al-Hamed HA. Preferential recognition of peroxynitrite damaged thymidine-monophosphate by anti-DNA autoantibodies in systemic lupus erythematosus. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2013; 31:736-51. [PMID: 23067125 DOI: 10.1080/15257770.2012.724135] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
This study was undertaken to investigate the role of peroxynitrite (ONOO(-)) modified thymine-5'-monophosphate (TMP) in the generation of anti-DNA autoantibodies in patients with systemic lupus erythematosus (SLE). TMP was exposed to ONOO(-) in vitro and challenged in vivo. TMP and ONOO(-)-modified-TMP were found to be nonimmunogenic in rabbits. TMP-linked-BSA and ONOO(-)-modified-TMP-BSA induced high titer antibodies. Induced antibodies against ONOO(-)-TMP-BSA show crossreactions with nucleic acids conformers. A high degree of specific binding by SLE autoantibodies with ONOO(-)-TMP-BSA was observed. Our novel results provide an important insight into the immunological basis of anti-DNA autoantibodies generation in SLE.
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Affiliation(s)
- Zafar Rasheed
- Department of Medical Biochemistry, College of Medicine, Qassim University, Buraidah, Saudi Arabia.
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Perazzio SF, Salomão R, Silva NP, Andrade LEC. Increased neutrophil oxidative burst metabolism in systemic lupus erythematosus. Lupus 2012; 21:1543-51. [PMID: 23012249 DOI: 10.1177/0961203312461060] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
INTRODUCTION There is increased frequency of discoid lesions (2.7%) and SLE (0.5%) in patients with chronic granulomatosus disease, but the literature is still controversial about phagocyte oxidative burst in SLE patients. MATERIALS AND METHODS 300 SLE patients and 301 blood donors were evaluated for quantitation of the oxidative burst in phagocytes by flow cytometry based on the oxidation of 2,7-dichlorofluorescein-diacetate after stimuli with Staphylococcus aureus and Pseudomonas aeruginosa. RESULTS Neutrophils from SLE patients displayed higher basal reactive oxygen species (ROS) production than healthy controls [Mean of fluorescence intensity (MFI) = 53.77 ± 11.38 vs 15.08 ± 2.63, p < 0.001] and after stimulation with S. aureus (MFI = 355.46 ± 58.55 vs 151.92 ± 28.25, p < 0.001) or P. aeruginosa (MFI = 82.53 ± 10.1 vs 48.99 ± 6.74, p < 0.001). There was stronger neutrophil response after bacterial stimuli (ΔMFI) in SLE patients than in healthy controls (S. aureus = 301.69 ± 54.42 vs 118.38 ± 26.03, p < 0.001; P. aeruginosa = 28.76 ± 12.3 vs 15.45 ± 5.15, p < 0.001), but no difference with respect to the oxidative burst profile according to disease activity (SLEDAI ≥ 6) or severity (SLICC-DI ≥2). Patients with kidney involvement presented higher basal and stimulated ROS production in neutrophils. DISCUSSION The present findings corroborate the important role of innate immunity in SLE and implicate neutrophils in the pathophysiology of the disease.
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Affiliation(s)
- S F Perazzio
- Division of Rheumatology, UNIFESP/EPM, São Paulo, Brazil
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Shah D, Sah S, Wanchu A, Wu MX, Bhatnagar A. Altered redox state and apoptosis in the pathogenesis of systemic lupus erythematosus. Immunobiology 2012; 218:620-7. [PMID: 22940256 DOI: 10.1016/j.imbio.2012.07.030] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 07/24/2012] [Accepted: 07/29/2012] [Indexed: 02/01/2023]
Abstract
An altered redox status and increased lymphocyte apoptosis have been implicated in the development of systemic lupus erythematosus (SLE). In this study, we evaluated the relationship between glutathione (GSH) depletion, reactive oxygen species (ROS) and, the progression of apoptosis and their association with SLE severity. Significant low levels of intracellular glutathione, total thiol and altered redox state (GSH/GSSG) were found in SLE patients, in which lymphocyte apoptosis and activated caspase-3 expression in the lymphocytes were remarkably increased. The severity of disease was positively allied with the increased levels of lymphocyte apoptosis and caspase-3, but negatively with the decreased levels of total thiol, depleted intracellular glutathione and altered redox state (GSH/GSSG). The lymphocyte apoptosis and activated caspase-3 expression were negatively associated with intracellular levels of GSH and redox state and positively associated with the elevated levels of multiple oxidative stress markers; ROS and lipid peroxidation measured as malondialdehyde (MDA). These results suggest that GSH depletion and elevated oxidative stress trigger apoptosis and may be coupled with the severity of the disease.
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Affiliation(s)
- Dilip Shah
- Department of Dermatology, Massachusetts General Hospital (MGH), Harvard Medical School (HMS), Boston, MA, USA
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Gu Y, Lu C, Zha Q, Kong H, Lu X, Lu A, Xu G. Plasma metabonomics study of rheumatoid arthritis and its Chinese medicine subtypes by using liquid chromatography and gas chromatography coupled with mass spectrometry. MOLECULAR BIOSYSTEMS 2012; 8:1535-43. [PMID: 22419152 DOI: 10.1039/c2mb25022e] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Rheumatoid arthritis (RA) is the most severe type of chronic inflammatory disease and has always been a research hotspot in different fields. In this study, a non-targeted metabonomics approach was carried out to profile metabolic characteristics of RA and its Chinese medicine subtypes by using liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS). Plasma samples of 57 RA patients and 23 healthy controls were collected. On the basis of the traditional Chinese medicine (TCM), RA patients were classified into two main patterns, the cold pattern and the heat pattern. By using univariate and multivariate data analysis, we found that the RA patients presented diverse dysfunctions in inositol phosphate metabolism, lipid metabolism, amino acid metabolism, glucose metabolism, ascorbate metabolism, glyoxylate and dicarboxylate metabolism. The metabolic phenotypes were different between the RA cold pattern and the RA heat pattern. Compared with the RA cold pattern, the RA heat pattern showed elevated plasma concentrations of glycochenodeoxycholate, proline, saturated and mono-unsaturated phosphatidylcholine (PC) but decreased levels of urea, free fatty acid (FFA) and polyunsaturated PC. Our data show that metabonomics is a valuable tool in disease and TCM subtype research.
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Affiliation(s)
- Yan Gu
- CAS Key Laboratory of Separation Science for Analytical Chemistry, Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, PR China
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Macrophages and neutrophils in SLE—An online molecular catalog. Autoimmun Rev 2012; 11:365-72. [DOI: 10.1016/j.autrev.2011.10.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2011] [Accepted: 10/11/2011] [Indexed: 12/14/2022]
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Wang X, Morgan DM, Wang G, Mozier NM. Residual DNA analysis in biologics development: Review of measurement and quantitation technologies and future directions. Biotechnol Bioeng 2011; 109:307-17. [DOI: 10.1002/bit.23343] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 08/09/2011] [Accepted: 09/19/2011] [Indexed: 01/09/2023]
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Shah D, Wanchu A, Bhatnagar A. Interaction between oxidative stress and chemokines: possible pathogenic role in systemic lupus erythematosus and rheumatoid arthritis. Immunobiology 2011; 216:1010-7. [PMID: 21601309 DOI: 10.1016/j.imbio.2011.04.001] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Accepted: 04/06/2011] [Indexed: 10/18/2022]
Abstract
Imbalance oxidative stress and chemokines are considered as a universal factors involved in the development of various clinical features seen in the patients with SLE and arthritis. To evaluate the interaction between oxidative stress and chemokines and their relationship with disease activity in SLE and RA patients, oxidative/anti-oxidant profiles and chemokines were assessed. Oxidant and anti-oxidant enzymes were measured in the plasma and the levels of chemokines; MCP-1/CCL2, RANTES/CCL5, MIP-1β/CCL-4 and IP-10/CXCL-10 were evaluated in the serum by an enzyme-linked immunosorbent assay (ELISA). A significant increase in the level of lipid peroxidation was found in SLE and RA patients and positively associated with disease activity. The activities of anti-oxidant enzymes: superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx) and anti-oxidant molecule GSH were significantly reduced in both diseases. Strong positive associations were found between MDA with RANTES/CCL5 and MIP-1β/CCL4 than MCP-1/CCL-2 in SLE patients while a sturdy connotation was seen with MIP-1β/CCL4 and MCP-1/CCL-2 in RA patients. The anti-oxidant molecule GSH shows a negative association with serum levels of MCP-1/CCL-2, RANTES/CCL5 and IP-10/CXCL-10 in SLE patients and with MCP-1/CCL-2 and RANTES/CCL5 in RA patients. A low level of GSH and high level of RANTES/CCL5 were associated with lupus nephritis patients. These results indicates that excessive production of ROS disturbs redox status and can modulate the expression of inflammatory chemokines leading to inflammatory processes, exacerbating inflammation and affecting tissue damage in autoimmune diseases, as exemplified by their strong association with disease activity.
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Affiliation(s)
- Dilip Shah
- Department of Biochemistry, Basic Medical Science Building, Panjab University, Chandigarh 160014, India
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Shah D, Aggarwal A, Bhatnagar A, Kiran R, Wanchu A. Association between T lymphocyte sub-sets apoptosis and peripheral blood mononuclear cells oxidative stress in systemic lupus erythematosus. Free Radic Res 2011; 45:559-67. [PMID: 21284579 DOI: 10.3109/10715762.2011.555765] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Increased oxidative stress and lymphocyte apoptosis are a hallmark of the autoimmune disease systemic lupus erythematosus (SLE). However, the association between oxidative stress and T lymphocytes apoptosis has still to be elucidated in SLE. In order to appraise the interaction between oxidative stress and T lymphocyte apoptosis with the severity of disease, oxidative stress profile and T lymphocytes apoptosis were studied. Increased levels of ROS, MDA and CD4(+) lymphocyte apoptosis were positively associated with disease activity while decreased levels of GSH and percentage expression of CD4(+) lymphocyte were negatively associated with disease activity. The decrease in intracellular levels of GSH was negatively associated with T lymphocyte, CD4(+) lymphocyte, CD8(+) lymphocyte apoptosis and intracellular caspase-3 expression. The present study suggests that increased T lymphocyte sub-sets apoptosis may be mediated by decreased intracellular glutathione concentration and severity of disease might be enhanced together by over-production of ROS in SLE.
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Affiliation(s)
- Dilip Shah
- Department of Biochemistry, Basic Medical Science Block, Panjab University, Chandigarh, India.
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Khan S, Alam R, Moinuddin, Ali A. Oxygen free radical modified DNA: Implications in the etiopathogenesis of Systemic lupus erythematosus. Indian J Clin Biochem 2009; 24:123-30. [PMID: 23105820 PMCID: PMC3453225 DOI: 10.1007/s12291-009-0023-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The present study was designed to probe the possible role of singlet oxygen and superoxide anion radical modified DNA in the etiopathogenesis of Systemic lupus erythematosus. These species were generated by the exposure of riboflavin to 365 nm UV light. Modified DNA showed single strand breaks, hyperchromicity at 260nm and decrease in Tm. The modified DNA induced high titer antibodies in experimental animals. The antibodies showed reactivity with various nucleic acid polymers, a property commonly associated with Systemic lupus erythematosus anti-DNA autoantibodies. Systemic lupus erythematosus sera showed preferential binding of modified DNA over native DNA in direct binding and competitive binding solid phase immunoassays and band shift assays. The results suggest for the possible involvement of the singlet- superoxide modified DNA as a potential trigger for anti- DNA autoantibody production in SLE and thus in the etiopathogenesis of the disease.
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Affiliation(s)
- Saba Khan
- Department of Biochemistry, Faculty of Medicine, J.N. Medical College, A.M.U., Aligarh, 202002 India
| | - Roshan Alam
- Department of Biochemistry, Faculty of Medicine, J.N. Medical College, A.M.U., Aligarh, 202002 India
| | - Moinuddin
- Department of Biochemistry, Faculty of Medicine, J.N. Medical College, A.M.U., Aligarh, 202002 India
| | - Asif Ali
- Department of Biochemistry, Faculty of Medicine, J.N. Medical College, A.M.U., Aligarh, 202002 India
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Bibliography. Current world literature. Systemic lupus erythematosus and Sjögren's syndrome. Curr Opin Rheumatol 2008; 20:631-2. [PMID: 18698190 DOI: 10.1097/bor.0b013e3283110091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Khan WA, Habib S, Khan WA, Alam K. Enhanced binding of circulating SLE autoantibodies to catecholestrogen-copper-modified DNA. Mol Cell Biochem 2008; 315:143-50. [PMID: 18543085 DOI: 10.1007/s11010-008-9798-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2008] [Accepted: 05/23/2008] [Indexed: 01/09/2023]
Abstract
Systemic lupus erythematosus (SLE) is a multisystem autoimmune disease characterized by circulating and tissue fixed autoantibodies reactive with self-antigens, including nucleic acid and other nuclear components. The pathways by which these autoantibodies act as a pathogenic factor remain elusive. Present study has investigated the role of estrogens in SLE etiopathogenesis. Estrogen-modified DNA [4-OHE(2)-Cu(II)-DNA] showed single- and double-strand breaks, hyperchromicity, decrease in Tm, and modification of bases. The 4-OHE(2)-Cu(II)-DNA exhibited increased binding with naturally occurring anti-DNA autoantibodies as compared to the unmodified native form (P < 0.001) as assessed by ELISA, quantitative precipitin titration, and gel retardation assay. The relative affinity of anti-DNA antibodies for modified and native DNA was in the order of 2.1 x 10(-7) M and 1.3 x 10(-6) M, respectively. The data suggested that DNA modified with 4-OHE(2) and Cu(II) may be one of the factors for the induction of circulating anti-DNA autoantibodies in SLE.
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Affiliation(s)
- Wahid Ali Khan
- Department of Biochemistry, J. N. Medical College, A. M. U., Aligarh, 202002, India
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