Thrombotic thrombocytopenic purpura related to severe ADAMTS13 deficiency in children

Springer Science and Business Media LLC - Tập 24 - Trang 19-29 - 2009
Chantal Loirat1,2, Jean-Pierre Girma3, Céline Desconclois3,4, Paul Coppo2,5, Agnès Veyradier2,3,4
1Service de Néphrologie, Hôpital Robert Debré, Assistance Publique-Hôpitaux de Paris, Université Paris VII, Paris, France
2Centre National de Référence des Microangiopathies Thrombotiques de l’adulte et de l’enfant, Paris, France
3Inserm U770, Université Paris XI, Le Kremlin Bicêtre, France
4Service d’Hématologie biologique, Hôpital Antoine Béclère, Assistance Publique-Hôpitaux de Paris, Clamart, France
5Service d’Hématologie clinique, Hôpital Saint Antoine, Assistance Publique-Hôpitaux de Paris, Université Paris VI, Paris, France

Tóm tắt

Thrombotic thrombocytopenic purpura (TTP) related to a severely deficient activity of the von Willebrand factor cleaving protease, ADAMTS (A Disintegrin And Metalloprotease with ThromboSpondin type 1 repeats) 13, is a life-threatening event, the onset of which may occur as early as childhood. TTP is either inherited (Upshaw-Schulman syndrome) via ADAMTS13 gene mutations (neonatal onset) or acquired via anti-ADAMTS13 autoantibodies (childhood onset). TTP is due to platelet- and von-Willebrand-factor-rich thrombi of the microvasculature, inducing mechanical hemolytic anemia, consumption thrombocytopenia, and multivisceral ischemia. Clinical course consists of relapsing acute events triggered mostly by infections, associated icterus and hyperbilirubinemia, severe hemolytic anemia with schistocytosis and a negative Coombs test, severe thrombocytopenia, and sometimes symptoms related to visceral ischemia (renal failure, central nervous system vascular events, other organ failure). The recently available ADAMTS13 laboratory investigation combining measurement of ADAMTS13 activity in plasma, search for an ADAMTS13 circulating inhibitor, and anti-ADAMTS13 IgG and ADAMTS13 gene sequencing is a crucial addition to TTP diagnosis. Plasma exchanges are first-line treatment of acquired TTP, combined with steroids and immunosuppressive drugs. Curative treatment of acute events in Upshaw-Schulman syndrome relies on plasma infusions (provider of active ADAMTS13). Guidelines for preventive treatment of relapses are not clearly established but should associate plasmatherapy and caution to triggers of relapses. Therapeutic perspectives are focused on the development of concentrated plasma-derived ADAMTS13 or recombinant ADAMTS13.

Tài liệu tham khảo

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