The objectives of this proposal are to more precisely define the characteristics of pathogenic autoantibodies (autoAb) and the mechanisms by which they form immune deposits and to identify the immunologic pathways leading to the production of these pathogenic autoAb in Systemic Lupus Erythematosus. For this purpose, monoclonal antibodies derived from MRL-lpr/lpr mice that share either antigen binding or idiotypic properties with nephritogenic Ig will be characterized according to subclass, isotype, idiotype, charge and antigen binding properties, and the capacity of these antibodies to form glomerular immune deposits in vivo, in normal mice, will be determined by both direct binding to glomerular antigens and in situ immune complex formation with circulating antigens. In separate studies the capacity of monoclonal autoAb to bind directly to normal mesangial cells will be evaluated. In addition, the ability of glomerular binding autoAb to induce the production of Ab with similar binding properties through idiotype-network interactions will be investigated. The origin and mechanism of production of Ab with nephritogenic properties will be examined in an attempt to identify the immunologic pathways leading to the production of pathogenic autoAb. Two experimental approaches will be utilized. In the first, unstimulated B cells from lupus and normal animals will be examined. In the second, the capacity of auto- reactive T cells cloned from MRL-lpr/lpr mice to induce B cells from lupus and normal mice to produce pathogenic autoAb will be evaluated. In both cases B cell hybridomas from MRL-lpr/lpr and normal mice at various ages and their Ab products will be evaluated. The usage of VH gene families and of a germline gene that encodes a prototypic autoAb associated with a high frequency idiotype, will be examined by hybridization. These studies should provide information regarding: the nephritogenic properties of lupus autoAb and the genes that encode them; the immunologic pathways that lead to the production of these immunoglobulins; and whether similar pathways are present in normal mice. In addition, these studies should determine whether the properties of these pathogenic autoAb or the genes that encode them change during the lifespan of autoimmune mice, and whether they differ in normal and autoimmune strains. Ultimately through this understanding a more rational approach to alter these events in individuals with lupus can be planned.

Agency
National Institute of Health (NIH)
Institute
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
Type
Research Project (R01)
Project #
5R01DK033694-08
Application #
3232106
Study Section
Pathology A Study Section (PTHA)
Project Start
1985-01-01
Project End
1992-12-31
Budget Start
1991-01-01
Budget End
1991-12-31
Support Year
8
Fiscal Year
1991
Total Cost
Indirect Cost
Name
University of Pennsylvania
Department
Type
Schools of Medicine
DUNS #
042250712
City
Philadelphia
State
PA
Country
United States
Zip Code
19104
Waldman, M; Madaio, M P (2005) Pathogenic autoantibodies in lupus nephritis. Lupus 14:19-24
Yanase, Kumiko; Madaio, Michael P (2005) Nuclear localizing anti-DNA antibodies enter cells via caveoli and modulate expression of caveolin and p53. J Autoimmun 24:145-51
Akis, Nese; Madaio, Michael P (2004) Isolation, culture, and characterization of endothelial cells from mouse glomeruli. Kidney Int 65:2223-7
Su, Wanfang; Madaio, Michael P (2003) Recent advances in the pathogenesis of lupus nephritis: autoantibodies and B cells. Semin Nephrol 23:564-8
Bloom, Roy D; O'Connor, Timothy; Cizman, Borut et al. (2002) Intrathymic kidney cells delay the onset of lupus nephritis in MRL-lpr/lpr mice. Int Immunol 14:867-71
Meyers, Kevin E C; Allen, Juanita; Gehret, Jeffrey et al. (2002) Human antiglomerular basement membrane autoantibody disease in XenoMouse II. Kidney Int 61:1666-73
Fields, M L; Sokol, C L; Eaton-Bassiri, A et al. (2001) Fas/Fas ligand deficiency results in altered localization of anti-double-stranded DNA B cells and dendritic cells. J Immunol 167:2370-8
Madaio, M P; Harrington, J T (2001) The diagnosis of glomerular diseases: acute glomerulonephritis and the nephrotic syndrome. Arch Intern Med 161:25-34
Rutgers, A; Meyers, K E; Canziani, G et al. (2000) High affinity of anti-GBM antibodies from Goodpasture and transplanted Alport patients to alpha3(IV)NC1 collagen. Kidney Int 58:115-22
Lin, J; Yanase, K; Rutgers, A et al. (1999) Selection of specific phage from display libraries: monoclonal antibody against VCS M13 helper phage coat protein III (gIIIp). Hybridoma 18:257-61

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