Isolation and Functional Identification of an Antiplatelet RGD-Containing Disintegrin from Cerastes cerastes Venom

Area of Science:

• Biochemistry
• Pharmacology
• Toxicology

Background:

• Snake venom contains diverse bioactive peptides.
• Disintegrins are a class of snake venom proteins known for their anti-platelet activity.
• Understanding novel disintegrins can lead to new therapeutic agents.

Purpose of the Study:

• To purify and characterize Cerastategrin, a novel disintegrin from Cerastes cerastes venom.
• To investigate the structural and functional properties of Cerastategrin, including its interaction with integrin receptors.
• To evaluate the therapeutic potential of Cerastategrin in vascular pathologies.

Main Methods:

• Purification of Cerastategrin from Cerastes cerastes venom.
• Structural characterization using MALDI-MSMS and 3D structure modeling.
• Functional assays including inhibition of ADP-induced platelet aggregation and in vivo anticoagulation studies.
• Analysis of αIIbβ3 receptor binding and P-Selectin expression.

Main Results:

• Cerastategrin is a basic disintegrin with 128 amino acid residues and a molecular weight of 13,835.25 Da.
• Structural modeling revealed an RGD motif, suggesting specific binding to integrin receptors.
• Cerastategrin demonstrated potent inhibition of ADP-induced platelet aggregation (IC50 = 0.88 µg/mL) and a long-lasting anticoagulation effect in vivo.
• The peptide specifically targets the αIIbβ3 receptor, reducing bound αIIbβ3 and externalized P-Selectin.

Conclusions:

• Cerastategrin is a potent platelet activation inhibitor targeting the αIIbβ3 receptor.
• Its stable anticoagulation properties suggest potential therapeutic applications in vascular diseases.
• Cerastategrin represents a promising new peptide for treating vascular pathologies.