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Interference of neutrophil-platelet interaction by YC-1: a cGMP-dependent manner on heterotypic cell-cell interaction

Chang-Hui Liao1, Jun-Ting Cheng, Che-Ming Teng

  • 1Graduate Institute of Natural Products, College of Medicine Chang Gung University No 259 Wen-Hwa 1st Road, Kwei-Shan, Tao-Yuan county, 333 Taiwan, Republic of China. liaoch@mail.cgu.edu.tw

European Journal of Pharmacology
|August 23, 2005
PubMed

Insights

N-Formyl-Met-Leu-Phe (fMLP) stimulates neutrophils to release cathepsin G, activating platelets and forming neutrophil-platelet complexes. YC-1 inhibits this process via a cGMP-dependent pathway, reducing complex formation.

Area of Science:

  • Immunology
  • Hematology
  • Pharmacology

Background:

  • Neutrophil-platelet complex formation is induced by N-Formyl-Met-Leu-Phe (fMLP).
  • fMLP-stimulated neutrophils activate platelets, involving P-selectin.
  • Cathepsin G released from neutrophils activates platelets, contributing to complex formation.

Purpose of the Study:

  • To investigate the inhibitory effects of YC-1 on fMLP-induced neutrophil-platelet complex formation.
  • To elucidate the underlying mechanisms of YC-1's action, including its effect on cathepsin G release and P-selectin expression.
  • To evaluate YC-1's efficacy in whole blood models.

Main Methods:

  • Co-incubation of neutrophils and platelets with fMLP.
  • Assessment of intracellular calcium mobilization in platelets.
  • Inhibition studies using monoclonal antibody 9E1 (anti-P-selectin).
  • Evaluation of YC-1, ODQ (guanylate cyclase inhibitor), and KT5835 (protein kinase G inhibitor).
  • Measurement of cathepsin G release and P-selectin expression.
  • Experiments conducted in whole blood.

Main Results:

  • YC-1 inhibited fMLP-induced neutrophil-platelet complex formation in a concentration-dependent manner (IC50 = 15.3 µM).
  • YC-1 inhibited fMLP-induced cathepsin G release (IC50 = 6.2 µM) and cathepsin G-induced P-selectin expression on platelets (IC50 = 32.5 µM).
  • Inhibitory effects of YC-1 were partially reversed by ODQ and KT5835, suggesting a cGMP-dependent pathway.
  • YC-1 demonstrated efficacy in inhibiting neutrophil-platelet complex formation in whole blood (IC50 = 35.8 µM).

Conclusions:

  • YC-1 effectively inhibits fMLP-induced neutrophil-platelet complex formation.
  • The primary mechanism involves YC-1 inhibiting cathepsin G release from neutrophils via a cGMP-dependent pathway.
  • YC-1's inhibition of P-selectin expression on platelets may further contribute to its overall effect.
  • YC-1 shows potential as a therapeutic agent for conditions involving neutrophil-platelet activation.

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