IgA nephropathy associated with seronegative spondylarthropathies

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Abstract
Three patients with a seronegative spondylarthropathy were found to have IgA nephropathy. Two patients had ankylosing spondylitis (one with psoriasis), and one had incomplete Reiter's syndrome. All three had a focal proliferative glomerulonephritis with IgA‐dominant mesangial immune deposits. One patient had a leukocytoclastic vasculitis. This association of IgA nephropathy with seronegative spondylarthropathies raises the possibility of a common or related pathogenesis. There is evidence to suggest that both diseases are mediated by genetically controlled immune responses to mucosal contact with etiologic antigens.

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