Two purified and characterized phospholipases A2 from Cerastes cerastes venom, that inhibit cancerous cell adhesion and migration

Toxicon. 2009 Mar 15;53(4):444-53. doi: 10.1016/j.toxicon.2009.01.003.

Abstract

Two non-toxic PLA2s were purified to homogeneity from Cerastes cerastes Tunisian snake venom. The purification process employed gel filtration on Sephadex G-75 followed by C18 reverse phase high-pressure liquid chromatography. These two acidic enzymes, namely CC-PLA2-1 and CC-PLA2-2, have a molecular weight of 13,737.52 and 13,705.63 Da, respectively. These two PLA2 are the first reported glycosylated phospholipases A2 purified from snake venom. The rates of glycosylation are 2.5% and 0.5% (w/w), respectively. Specific activities of 1800 U/mg and 2400 U/mg for CC-PLA2-1 and CC-PLA2-2, respectively, were measured at optimal conditions. CC-PLA2-1 and CC-PLA2-2 strongly inhibited coagulation. They also exhibited a marked dose-dependent inhibitory effect on platelet aggregation induced by ADP and arachidonic acid in platelet-rich plasma. Interestingly, CC-PLA2-1 and CC-PLA2-2 inhibited in a dose-dependent manner adhesion of IGR39 melanoma and HT1080 fibrosarcoma cells to fibrinogen and fibronectin. Furthermore, both CC-PLA2-1 and CC-PLA2-2 abolished HT1080 cell migration towards fibrinogen and fibronectin. This activity is reported for the first time for PLA2 enzymes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Blood Coagulation / drug effects
  • Blood Platelets / drug effects
  • Cell Adhesion / drug effects*
  • Cell Line, Tumor
  • Cell Movement / drug effects*
  • Humans
  • Molecular Sequence Data
  • Phospholipases A2 / chemistry*
  • Phospholipases A2 / pharmacology*
  • Rabbits
  • Viper Venoms / chemistry
  • Viper Venoms / enzymology*
  • Viperidae / physiology*

Substances

  • Viper Venoms
  • Phospholipases A2