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In mice, ovariectomy accelerates the progression of the end-stage renal disease glomerulosclerosis. In women, the incidence of this disease increases after menopause, and estrogen alters its progression. Polymorphisms in the human estrogen receptor alpha (ERalpha) gene have been suggested to constitute a genetic predisposition for lupus nephritis. Here we show that by 1 year of age, mice lacking ERalpha (ERalpha(-/-)) but not those lacking ERbeta (ERbeta(-/-)) exhibit immune complex-type glomerulonephritis, proteinuria, and destruction of tubular cells with severe infiltration of B lymphocytes in the kidney and the presence of anti-DNA antibodies in serum. No gender difference occurred in the incidence or severity of these symptoms. However, in female but not in male ERalpha(-/-) mice there were elevated serum levels of IgG3. Other prominent features of these mice were (i) spontaneous formation of germinal centers in the spleen in the absence of antigen challenge and (ii) infiltration of plasma cells in the kidney and plasmacytosis in the spleen. Immunohistochemistry indicated a selective expression of ERalpha protein in the germinal centers but not in the follicular mantle zone of murine spleens and human tonsils. Our results indicate that ERalpha has indispensable functions in the kidney and in germinal centers, and that defective ERalpha signaling results in glomerulonephritis.

Autoimmune glomerulonephritis with spontaneous formation of splenic germinal centers in mice lacking theestrogen receptor alphagene