Zinc delays clot lysis by attenuating plasminogen activation and plasmin-mediated fibrin degradation

Sara J. Henderson; Alan R. Stafford; Beverly A. Leslie; Paul Y. Kim; Nima Vaezzadeh; Ran Ni; James C. Fredenburgh; Jeffrey I. Weitz

doi:10.1160/TH14-09-0771

Thrombosis and Haemostasis, Inhaltsverzeichnis

Thromb Haemost 2015; 113(06): 1278-1288
DOI: 10.1160/TH14-09-0771

Coagulation and Fibrinolysis

Schattauer GmbH

Zinc delays clot lysis by attenuating plasminogen activation and plasmin-mediated fibrin degradation

Sara J. Henderson

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

²Department of Biochemistry and Biomedical Science, McMaster University, Hamilton, Ontario, Canada

,

Alan R. Stafford

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

³Department of Medicine, McMaster University, Hamilton, Ontario, Canada

,

Beverly A. Leslie

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

³Department of Medicine, McMaster University, Hamilton, Ontario, Canada

,

Paul Y. Kim

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

³Department of Medicine, McMaster University, Hamilton, Ontario, Canada

,

Nima Vaezzadeh

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

⁴Department of Medical Sciences, McMaster University, Hamilton, Ontario, Canada

,

Ran Ni

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

⁴Department of Medical Sciences, McMaster University, Hamilton, Ontario, Canada

,

James C. Fredenburgh

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

³Department of Medicine, McMaster University, Hamilton, Ontario, Canada

,

Jeffrey I. Weitz

¹Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, Ontario, Canada

²Department of Biochemistry and Biomedical Science, McMaster University, Hamilton, Ontario, Canada

³Department of Medicine, McMaster University, Hamilton, Ontario, Canada

⁴Department of Medical Sciences, McMaster University, Hamilton, Ontario, Canada

› Institutsangaben

Abstract

Summary

Zinc circulates free in plasma at a concentration of 0.1–2 μM, but its levels increase locally when it is released from activated platelets. Although zinc influences many processes in haemostasis, its effect on fibrinolysis has not been thoroughly investigated. Using a fluorescent zinc-binding probe, we demonstrated that zinc binds tissue-type plasminogen activator (tPA) and plasmin with high affinity (K_d values of 0.2 μM), and surface plasmon resonance studies revealed that zinc binds fibrin with a K_d of 12.8 μM. Zinc had no effect on the affinity of plasminogen or plasmin for fibrin, but increased the affinity of tPA by two-fold. In the presence of 5 μM zinc, the catalytic efficiency of plasminogen activation by tPA was reduced by approximately two-fold, both in the absence or presence of fibrin. Zinc attenuated plasminmediated degradation of the fibrinogen alpha-chain by 43 %, but had no effect on trypsin degradation. tPA-mediated fibrin clot lysis was prolonged 2.5-fold by zinc in a concentration-dependent fashion, and tPA-mediated plasma clot lysis was attenuated by 1.5-fold. Therefore, our data indicate that zinc modulates fibrinolysis by attenuating tPAmediated plasminogen activation and plasmin-induced fibrin degradation. These findings suggest that local release of zinc by platelets attenuates fibrinolysis.

Keywords

Zinc - fibrinolysis - fibrin - plasminogen - plasmin

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Referenzen

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