Nephritogenic antibodies in lupus nephritis

Area of Science:

• Immunology
• Nephrology
• Rheumatology

Background:

• Lupus nephritis pathogenesis involves complex immune mechanisms.
• Previous research focused on IgG3 cryoglobulins, anti-DNA antibodies, and anti-DNA idiotypes.
• The role of cationic nuclear autoantigens remains an area for detailed investigation.

Purpose of the Study:

• To critically discuss existing data on lupus nephritis pathogenesis.
• To present and detail the potential role of cationic nuclear autoantigens.
• To investigate histones as a model antigen in this context.

Main Methods:

• Critical review of existing data on immune factors in lupus nephritis.
• Detailed presentation of the cationic nuclear autoantigen hypothesis.
• Experimental use of histones as a model antigen, assessing their binding affinity to rat glomerular basement membrane (GBM) and their ability to induce immune complex (IC) formation and mediate DNA binding.

Main Results:

• Histones exhibit high affinity for the rat GBM.
• Histones can function as planted antigens, inducing IC formation.
• Histones mediate the binding of anionic DNA, and are found in glomerular deposits in lupus mice and SLE patients.

Conclusions:

• Cationic nuclear autoantigens, exemplified by histones, represent a significant potential factor in lupus nephritis pathogenesis.
• Histones' ability to bind GBM and DNA, and their presence in kidney lesions, strongly link them to the disease.
• These findings provide crucial evidence supporting the role of histones in the development of lupus nephritis.