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Granular capillary loop staining for thrombospondin type-1 domain-containing 7A (THSD7A). Our understanding of the pathogenesis of membranous glomerulopathy was transformed with the discovery that most cases of ‘idiopathic’ MN are due to autoantibodies directed against the phospholipase A2 receptor (PLA2R) protein.(1) More recently, thrombospondin type-1 domain-containing 7A (THSD7A) protein was described as a second antigenic target of autoantibodies in this disease.(2) Recent reports have implicated malignancy as the underlying etiology in some cases of THSD7A-associated MN.(3-5) 1. Beck LH, Bonegio RG, Lambeau G, et al. M-type phospholipase A2 receptor as target antigen in idiopathic membranous nephropathy. N Engl J Med...