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American Journal of Pathology, Vol 143, 304-311, Copyright © 1993 by American Society for Investigative Pathology

REGULAR ARTICLES

Ultrastructural localization of DNA in immune deposits of human lupus nephritis

D Malide, I Londono, P Russo and M Bendayan
Department of Anatomy, Universite de Montreal, Quebec, Canada.

DNA molecules were revealed in the glomerular wall of lupus nephritis patients by applying two specific colloidal gold cytochemical approaches at the electron microscope level: immunocytochemistry using a monoclonal anti-DNA antibody in conjunction with protein A-gold and enzyme-gold cytochemistry using DNAse-gold complexes. Application of both techniques has demonstrated that DNA molecules are preferentially located over the electron-dense deposits found in the glomerular basement membrane and mesangial matrix of SLE patients, as well as over the nuclei. Their distribution within the glomerular wall was correlated with electron-dense immune deposits revealed by anti-light chain antibodies. In normal control kidney, DNA labeling was restricted to the cell nuclei. Several control experiments have demonstrated the high specificity of the results. These data thus suggest a possible role for DNA as an antigenic component in the formation of immune complexes.


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T.-M. Chan, J. K.-H. Leung, S. K.-N. Ho, and S. Yung
Mesangial Cell-Binding Anti-DNA Antibodies in Patients with Systemic Lupus Erythematosus
J. Am. Soc. Nephrol., May 1, 2002; 13(5): 1219 - 1229.
[Abstract] [Full Text] [PDF]


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Copyright © 1993 by the American Society for Investigative Pathology.