Progress in Hematology Recent advance in thrombotic thrombocytopenic purpura

International Journal of Hematology

, Volume 91, Issue 1, pp 1-19

Pathophysiology of thrombotic thrombocytopenic purpura

  • Han-Mou TsaiAffiliated withSection of Thrombosis and Hemostasis, Division of Hematology and Oncology, H046, Pennsylvania State University, Milton S. Hershey College of Medicine, Pennsylvania State Cancer Institute Email author 

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Thrombotic thrombocytopenic purpura (TTP) is a disorder with characteristic von Willebrand factor (VWF)-rich microthrombi affecting the arterioles and capillaries of multiple organs. The disorder frequently leads to early death unless the patients are treated with plasma exchange or infusion. Studies in the last decade have provided ample evidence to support that TTP is caused by deficiency of a plasma metalloprotease, ADAMTS13. When exposed to high shear stress in the microcirculation, VWF and platelets are prone to form aggregates. This propensity of VWF and platelet to form microvascular thrombosis is mitigated by ADAMTS13, which cleaves VWF before it is activated by shear stress to cause platelet aggregation in the circulation. Deficiency of ADAMTS13, due to autoimmune inhibitors in patients with acquired TTP and mutations of the ADAMTS13 gene in hereditary cases, leads to VWF–platelet aggregation and microvascular thrombosis of TTP. In this review, we discuss the current knowledge on the pathogenesis, diagnosis and management of TTP, address the ongoing controversies, and indicate the directions of future investigations.


TTP von Willebrand factor ADAMTS13 Shear stress Microvascular thrombosis