Caspase inhibition decreases both platelet phosphatidylserine exposure and aggregation: Caspase inhibition of platelets

Zoë Cohen, Jonathan Wilson, Leslie S Ritter, Paul McDonagh

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

Apoptosis of nucleated cells is regulated by caspases, a group of cysteine proteases, and is characterized by phosphatidylserine expression on the outer leaflet of the plasma membrane. Reports indicate that platelets contain caspases. However, the role of caspases in platelet function is not well understood. When platelets become activated, they express phosphatidylserine (PS) on the outer leaflet of the plasma membrane. In addition, platelets aggregate when activated. The aims of this study were to determine if caspase inhibition (using the pan-caspase inhibitor zVAD-fmk): (1) decreased PS expression and (2) decreased platelet aggregation following activation. Flow cytometry was used to determine PS expression and a platelet aggregometer was used to assess aggregation. We found that platelets treated with zVAD-fmk significantly decreased both A23187-induced PS exposure (total fluorescence index, TFI: A23187=791.42±174; zVAD+A23187=92.97±57, p≤0.05) and ADP-induced PS exposure (TFI: ADP=669.24±145, zVAD+ADP=174. 6±151, p≤0.05). Further, treatment with zVAD-fmk significantly decreased ADP-induced platelet aggregation (%: untreated=80±1.5, zVAD treated=69±3.0, p≤0.05). These results indicate that caspases play a role in platelet activation, suggesting a unique physiologic role for these proteases.

Original languageEnglish (US)
Pages (from-to)387-393
Number of pages7
JournalThrombosis Research
Volume113
Issue number6
DOIs
StatePublished - 2004

Fingerprint

Phosphatidylserines
Caspases
Blood Platelets
Adenosine Diphosphate
Calcimycin
Platelet Aggregation
Cell Membrane
Caspase Inhibitors
Cysteine Proteases
Platelet Activation
Flow Cytometry
Peptide Hydrolases
Fluorescence
Apoptosis

Keywords

  • Aggregation
  • Apoptosis
  • Caspases
  • Phosphatidylserine
  • Platelet

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Hematology

Cite this

Caspase inhibition decreases both platelet phosphatidylserine exposure and aggregation : Caspase inhibition of platelets. / Cohen, Zoë; Wilson, Jonathan; Ritter, Leslie S; McDonagh, Paul.

In: Thrombosis Research, Vol. 113, No. 6, 2004, p. 387-393.

Research output: Contribution to journalArticle

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