Membranous nephropathy is an autoimmune disease in which the body’s immune system targets and attacks the glomeruli. The glomeruli become leaky, leading to abnormal loss of protein in the urine (proteinuria) and a decrease in the ability of the kidneys to filter waste products and excess fluid from the blood.

Lupus nephritis is a kidney disorder that occurs as a result of systemic lupus erythematosus (SLE), an autoimmune disease. In lupus nephritis, the body's immune system attacks the kidney tissues, causing inflammation and kidney damage.

IgA vasculitis, formerly Henoch-Schonlein purpura, is the most common childhood systemic vasculitis (inflammation of small-sized blood vessels). The disease develops after IgA antibodies deposit in the walls of small blood vessels, which results in inflammation.