Mechanisms of human neutrophil elastase-catalysed inactivation of factor VIII(a)

Keiji Nogami; Kenichi Ogiwara; Tomoko Matsumoto; Katsumi Nishiya; Masahiro Takeyama; Midori Shima

doi:10.1160/TH10-12-0777

Thrombosis and Haemostasis, Inhaltsverzeichnis

Thromb Haemost 2011; 105(06): 968-980
DOI: 10.1160/TH10-12-0777

Blood Coagulation, Fibrinolysis and Cellular Haemostasis

Schattauer GmbH

Mechanisms of human neutrophil elastase-catalysed inactivation of factor VIII(a)

Keiji Nogami

¹Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan

,

Kenichi Ogiwara

¹Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan

,

Tomoko Matsumoto

¹Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan

,

Katsumi Nishiya

¹Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan

,

Masahiro Takeyama

¹Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan

,

Midori Shima

¹Department of Pediatrics, Nara Medical University, Kashihara, Nara, Japan

› Institutsangaben

Abstract

Summary

Mechanisms of inflammation and coagulation are linked through various pathways. Human neutrophil elastase (HNE), can bind to activated platelets, might be localised on platelet membranes that provide negatively-charged phospholipid essential for the optimum function of tenase complex. In this study, we examined the effect of HNE on factor (F)VIII. FVIII activity was rapidly diminished in the presence of HNE and was undetectable within 10 minutes. The inactivation rate waŝ8-fold greater than that of activated protein C (APC). This time-dependent inactivation was moderately affected by von Willebrand factor. HNE proteolysed the heavy chain (HCh) of FVIII into two terminal products, A1^1–358 and A2^375–708, by limited proteolysis at Val³⁵⁸, Val³⁷⁴, and Val⁷⁰⁸. Cleavage at Val⁷⁰⁸ was much slower than that at Val³⁵⁸ in the >90-kDa A1-A2-B compared to the 90-kDa A1-A2. The 80-kDa light chain (LCh) was proteolysed to 75-kDa product by cleavage at Val¹⁶⁷⁰. HNE-cata- lysed FVIIIa inactivation was markedly slower than that of native FVIII (by ~25-fold), due to delayed cleavage at Val⁷⁰⁸ in FVIIIa. The inactivation rate mediated by HNE was ~8-fold lower than that by APC. Cleavages at Val³⁵⁸ and Val⁷⁰⁸ were regulated by the presence of LCh and HCh, respectively. In conclusion, HNE-catalysed FVIII inactivation was associated with the limited-proteolysis that led to A1^1–358, A2^375–708, and A3-C1-C2^1671–2332, and subsequently to critical cleavage at Val⁷⁰⁸. HNE-related FVIII(a) reaction might play a role in inactivation of HNE-induced coagulation process, and appeared to depend on the amounts of inactivated FVIII and active FVIIIa which is predominantly resistant to HNE inactivation.

Note: An account of this work was presented at the 51st annual meeting of the American Society of Hematology, December 10, 2009, New Orleans, LA, USA.

Keywords

FVIII - FVIIIa - human neutrophil elastase (HNE) - inactivation - proteolysis

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Referenzen

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