A potent platelet aggregation inducer from Trimeresurus gramineus snake venom

Area of Science:

• Biochemistry
• Pharmacology
• Toxicology

Background:

• Snake venom contains numerous bioactive compounds.
• Platelet aggregation is a critical process in hemostasis and thrombosis.
• Understanding novel platelet activators is crucial for developing therapeutic interventions.

Purpose of the Study:

• To purify and characterize a potent platelet aggregation inducer from Trimeresurus gramineus snake venom.
• To elucidate the mechanism of action of this novel platelet activator.

Main Methods:

• DEAE-Sephadex A-50 and Sephacryl S-300 column chromatography for purification.
• Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for homogeneity assessment.
• Platelet aggregation and serotonin release assays in rabbit platelet-rich plasma and suspension.

Main Results:

• A homogeneous platelet aggregation inducer, aggregoserpentin, was purified.
• Aggregoserpentin induced dose-dependent platelet aggregation and serotonin release, requiring exogenous calcium.
• The activation mechanism involved lowering cAMP levels and potentially activating phospholipase A2, independent of prostaglandin synthesis.

Conclusions:

• Aggregoserpentin is a potent platelet activator isolated from Trimeresurus gramineus snake venom.
• Its mechanism of action involves modulation of intracellular cAMP levels and possibly platelet activating factor formation.
• This finding contributes to the understanding of snake venom toxins and platelet activation pathways.