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Journal Article
Review
The role of ADAMTS13 in the pathogenesis of thrombotic thrombocytopenic purpura-hemolytic uremic syndrome.
Clinical Advances in Hematology & Oncology : H&O 2005 August
The identification, characterization, and clinical observation of ADAMTS13 (a disintegrin and metalloprotease with thrombospondin-1-like domains) have provided important insights into the pathogenesis of thrombotic thrombocytopenic purpura (TTP). ADAMTS13 is a plasma enzyme essential for postsecretion proteolytic processing of von Willebrand factor (VWF). Absence of ADAMTS13 is associated with the occurrence of abnormally large multimers of VWF and is also associated with the occurrence of TTP. Initial assumptions that absent ADAMTS13 was itself the etiology of TTP have been tempered by subsequent observations that ADAMTS13 activity can be severely deficient without clinical abnormalities and that patients can have characteristic clinical features of TTP without severe ADAMTS13 deficiency. A current interpretation of these observations is that ADAMTS13 deficiency is a major risk factor for the development of TTP, but it is neither always necessary nor sufficient to cause TTP. This interpretation is consistent with other vascular and thrombotic disorders in which multiple risk factors and associated conditions contribute to the etiology of acute events.
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