Inhibitory mechanisms of activated matrix metalloproteinase-9 on platelet activation

Ye Ming Lee, Jie Jen Lee, Ming Yi Shen, George Hsiao, Joen Rong Sheu

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The intracellular mechanisms underlying the signaling pathways of activated matrix metalloproteinase-9 (MMP-9) in platelets are not yet completely understood. Therefore, the aim of this study was to further examine the effects of activated MMP-9 in preventing platelet aggregation. In this study, activated MMP-9 time-dependently (3-60 min) inhibited platelet aggregation in washed human platelet suspensions stimulated by agonists. However, activated MMP-9 had no significant effect on the binding of FITC-triflavin to the platelet glycoprotein IIb/IIIa complex. Triflavin is a specific antagonist of the glycoprotein IIb/IIIa complex purified from snake venom. Moreover, activated MMP-9 (21 and 90 ng/ml) markedly decreased the fluorescence intensity of platelet membranes tagged with diphenylhexatriene. The thrombin-evoked increase in pHi was inhibited in the presence of activated MMP-9 (21 and 90 ng/ml). In addition, activated MMP-9 (21 and 90 ng/ml) markedly reduced the electron spin resonance (ESR) signal intensity of hydroxyl radicals in collagen (1 μg/ml)-activated platelets. These results indicate that the antiplatelet activity of activated MMP-9 may involve the following pathways: (1) activated MMP-9 may initially induce conformational changes in platelet membranes and hydroxyl radical formation, leading to inhibition of platelet aggregation; and (2) activated MMP-9 also inhibits the Na+/H+ exchanger, leading to reduced intracellular Ca2+ mobilization, and ultimately to inhibition of platelet aggregation. This study further provides new insights concerning the effects of activated MMP-9 on platelet aggregation.

Original languageEnglish
Pages (from-to)52-58
Number of pages7
JournalEuropean Journal of Pharmacology
Volume537
Issue number1-3
DOIs
Publication statusPublished - May 10 2006

Fingerprint

Matrix Metalloproteinase 9
Platelet Activation
Platelet Aggregation
Blood Platelets
Platelet Glycoprotein GPIIb-IIIa Complex
Hydroxyl Radical
Diphenylhexatriene
Integrin beta3
Sodium-Hydrogen Antiporter
Snake Venoms
Membranes
Fluorescein-5-isothiocyanate
Electron Spin Resonance Spectroscopy
Thrombin
Suspensions
Collagen
Fluorescence

Keywords

  • Hydroxyl radical
  • Matrix metalloproteinase-9
  • Membrane fluidity
  • Na/H exchanger
  • Platelet aggregation

ASJC Scopus subject areas

  • Cellular and Molecular Neuroscience
  • Pharmacology

Cite this

Inhibitory mechanisms of activated matrix metalloproteinase-9 on platelet activation. / Lee, Ye Ming; Lee, Jie Jen; Shen, Ming Yi; Hsiao, George; Sheu, Joen Rong.

In: European Journal of Pharmacology, Vol. 537, No. 1-3, 10.05.2006, p. 52-58.

Research output: Contribution to journalArticle

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