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Platelet Adhesion and Aggregation Under Flow using Microfluidic Flow Cells
Published on: October 27, 2009
Inhibition of human platelet aggregation by gangliosides
H A Guglielmone1, J J Daniele, I D Bianco
1Laboratorio de Análisis Clínicos Especializados (L.A.C.E.), 5000, Córdoba, Argentina.
Thrombosis Research
|March 9, 2000
Summary
Exogenous gangliosides partially inhibit human platelet aggregation and ATP release. These lipids block collagen- and ADP-induced aggregation, suggesting a role in platelet signaling pathways.
Area of Science:
- Biochemistry
- Hematology
- Cell Biology
Background:
- Gangliosides are modified upon platelet stimulation, indicating potential functional roles in platelet physiology.
- Understanding ganglioside function is crucial for elucidating platelet activation mechanisms.
Purpose of the Study:
- To evaluate the effect of exogenously added gangliosides on human platelet aggregation.
- To identify specific ganglioside types that influence platelet aggregation.
Main Methods:
- Human platelets were pretreated with a mixture of total gangliosides from bovine brain and purified mono-, di-, and tri-sialogangliosides.
- Platelet aggregation was induced by collagen, ADP, thrombin, Ca(2+) ionophores, arachidonic acid, U46619, epinephrine, fluoroaluminate, and phorbol myristate acetate.
- ATP release was measured following stimulation.
Main Results:
- Total gangliosides (G(TOT)) and purified gangliosides (G(M1), G(M3), G(D1a), G(T1b)) partially inhibited collagen-induced aggregation and ATP release.
- These gangliosides completely blocked the second aggregation wave induced by ADP.
- AsialoG(M1) and sulphatide did not significantly affect platelet aggregation.
- Gangliosides inhibited aggregation induced by agonists downstream of prostaglandin synthesis, including U46619, suggesting inhibition of prostaglandin synthesis or thromboxane A(2) action.
- Platelets treated with gangliosides remained responsive to epinephrine, fluoroaluminate, and phorbol myristate acetate.
Conclusions:
- Exogenous gangliosides can modulate human platelet aggregation and ATP release.
- Specific ganglioside structures inhibit key signaling pathways involved in platelet activation.
- Gangliosides may exert their inhibitory effects by interfering with prostaglandin synthesis or thromboxane A(2) signaling.
- Gangliosides represent a potential target for regulating platelet function.
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