In-vitro and in-vivo consequences of mutations in the von Willebrand factor cleaving protease ADAMTS13 in thrombotic thrombocytopenic purpura

Roberta Donadelli; Federica Banterla; Miriam Galbusera; Cristina Capoferri; Sara Bucchioni; Sara Gastoldi; Silvia Nosari; Giuseppe Monteferrante; Zaverio M. Ruggeri; Elena Bresin; Friedrich Scheiflinger; Edoardo Rossi; Constantino Martinez; Rosanna Coppo; Giuseppe Remuzzi; Marina Noris; the International Registry of Recurrent and Familial HUS/TTP; on behalf of

doi:10.1160/TH06-05-0236

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2006; 96(04): 454-464
DOI: 10.1160/TH06-05-0236

Blood Coagulation, Fibrinolysis and Cellular Haemostasis

Schattauer GmbH

In-vitro and in-vivo consequences of mutations in the von Willebrand factor cleaving protease ADAMTS13 in thrombotic thrombocytopenic purpura

Authors

Roberta Donadelli

¹Mario Negri Institute for Pharmacological Research, Bergamo, Italy
Federica Banterla

¹Mario Negri Institute for Pharmacological Research, Bergamo, Italy
Miriam Galbusera

¹Mario Negri Institute for Pharmacological Research, Bergamo, Italy
Cristina Capoferri

¹Mario Negri Institute for Pharmacological Research, Bergamo, Italy
Sara Bucchioni

²Clinical Research Center for Rare Diseases, Aldo e Cele Daccò, Villa Camozzi-Ranica, Italy
Sara Gastoldi

¹Mario Negri Institute for Pharmacological Research, Bergamo, Italy
Silvia Nosari

²Clinical Research Center for Rare Diseases, Aldo e Cele Daccò, Villa Camozzi-Ranica, Italy
Giuseppe Monteferrante

²Clinical Research Center for Rare Diseases, Aldo e Cele Daccò, Villa Camozzi-Ranica, Italy
Zaverio M. Ruggeri

³Roon Center for Arteriosclerosis and Thrombosis, Division of Experimental Hemostasis and Thrombosis, Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California, USA
Elena Bresin

²Clinical Research Center for Rare Diseases, Aldo e Cele Daccò, Villa Camozzi-Ranica, Italy
Friedrich Scheiflinger

⁴Baxter BioScience, Biomedical Research Center, Orth/Donau, Austria
Edoardo Rossi

⁵Immunohematology and Blood Transfusion Service, Luigi Sacco Hospital, Milan, Italy
Constantino Martinez

⁶Centro Regional de Hemo-donación, University of Murcia, Spain
Rosanna Coppo

⁷Department of Nephrology, Dialysis and Transplantatiuon, Regina Margherita Hospital, Turin, Italy
Giuseppe Remuzzi

¹Mario Negri Institute for Pharmacological Research, Bergamo, Italy

⁸Division of Nephrology and Dialysis, Azienda Ospedaliera, Ospedali Riuniti di Bergamo, Bergamo, Italy
Marina Noris

²Clinical Research Center for Rare Diseases, Aldo e Cele Daccò, Villa Camozzi-Ranica, Italy

the International Registry of Recurrent and Familial HUS/TTP

Abstract

Summary

Thrombotic thrombocytopenic purpura (TTP) is a disease characterized by microvascular thrombosis, often associated with deficiency of the von Willebrand factor (VWF) cleaving protease ADAMTS13.We investigated the spectrum of ADAMTS13 gene mutations in patients with TTP and congenital ADAMTS13 deficiency to establish the consequences on ADAMTS13 processing and activity. We describe five missense (V88M, G1239V, R1060W, R1123C and R1219W), 1 nonsense (W1016Stop) and 1 insertion (82_83insT) mutations. In two patients no mutation was identified despite undetectable protease activity. Expression in HEK293 mammalian cells (V88M, G1239V, R1123C and R1219W) documented that three missense mutants were not secreted, whereas theV88M was secreted at low levels and with reduced activity. We also provide evidence that impaired secretion of ADAMTS13 mutants observed in vitro translates into severely reduced ADAMTS13 antigen levels in patients in vivo. To evaluate whether the small amounts of mutant protease present in the circulation of patients had VWF cleaving activity, WT and mutant rADAMTS13 were stably expressed in Drosophila S2 cells under the influence of the Drosophila BiP protein signal sequence, which allows protein secretion. Drosophila expression system showed a 40–60% protease activity in the mutants. Several single nucleotide polymorphisms (SNPs) within exons and intron boundaries were found in patients, suggesting that the interplay of SNPs could at least in part account for ADAMTS13 functional abnormalities in patients without mutations. In conclusion, defective secretion and impaired activity of the mutants concur to determine an almost complete deficiency of ADAMTS13 activity in patients with a homozygous or two heterozygous ADAMTS13 mutations.

Keywords

Thrombotic thrombocytopenic purpura - ADAMTS13 - mutations - expression studies

Full Text

References

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