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Immunochemical Studies on Catechol-Estrogen Modified Plasmid: Possible Role in Rheumatoid Arthritis

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Abstract

Introduction

Increased concentrations of estrogen metabolites (catecholestrogens) have been found in rheumatoid arthritis (RA) but the exact patho-etiology remains elusive.

Methods

The binding of antibodies from the sera of RA patients and control subjects to native and modified DNA was studied by direct binding and inhibition ELISA, quantitative precipitin titration. Experimentally induced antibodies were also checked to detect oxidative lesions in the DNA as well as for the estimation of 8-hydroxy-2′-deoxyguanosine (8-OHdG) levels in different fluids of RA.

Results

Anti-DNA IgG from RA sera, exhibited increased recognition of modified DNA than native DNA (nDNA; P < 0.001). The relative affinity of anti-DNA antibodies for modified and nDNA was in the order of 1.85 × 10−7, 1.23 × 10−7, and 1.2 × 10−6. Samples of DNA from RA patients showed a significant inhibition in the induced antibody activity in comparison to DNA isolates from controls (P < 0.001). The concentration of 8-OHdG evaluated by induced antibody in RA patients was found to be significantly higher than controls ((P < 0.0001, P < 0.01, P < 0.05).

Conclusion

High binding of modified DNA with the IgG from RA patient might explain possible antigenic role of 4-OHE2-modified DNA in the production of anti-DNA antibodies. In addition, the induced antibodies have been shown to represent an alternative immunochemical probe to detect oxidative lesions in DNA as well as for the estimation of 8-OHdG levels in different body fluid of RA patients, which may be used as marker in the diagnosis of the disease.

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Acknowledgement

The authors thank Dr. H S Chabbra for his help and support. We are greatly thankful to him for providing lab facility and constructive discussions during this work.

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Correspondence to Wahid Ali Khan.

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Khan, W.A., Moinuddin & Assiri, A.S. Immunochemical Studies on Catechol-Estrogen Modified Plasmid: Possible Role in Rheumatoid Arthritis. J Clin Immunol 31, 22–29 (2011). https://doi.org/10.1007/s10875-010-9455-9

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  • DOI: https://doi.org/10.1007/s10875-010-9455-9

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