Lectin-induced adhesion of human platelets to glass. Comparison with the lectin-induced aggregation.
Effects of Phytohaemagglutinin (PHA), Concanavalin A (Con A) and Lens culinaris (Lens) lectins on the adhesion of human platelets to glass surface were studied. All the three lectins tested enhanced platelet adhesion to glass. Concentration-effect curves showed that maximum effect was reached at about 25-30 micrograms/ml. In the presence of autologous plasma both spontaneous and lectin-induced adhesion to glass were diminished. The inhibitory effect of KCN, NaN3, cytochalasin B and partly of colchicin suggests that lectin-induced platelet adhesion to glass is a process depending on cell metabolism and the state of the cytoskeleton. Only PHA was observed to be a potent inducer of platelet aggregation similar to physiological aggregants. Con A had no effect on platelet aggregation but caused shape change which was blocked by metabolic inhibitors. Neither shape change nor aggregation were induced by Lens up to a concentration of 400 micrograms/ml. A comparison between the mechanisms of lectin-induced substrate adhesion and lectin-induced aggregation of platelets is described.
Central Laboratory of Biophysics, Bulgarian Academy of Sciences, Sofia.
G
G
Altankov
M
M
Setchenska
D003208:Concanavalin A / Q000037:antagonists & inhibitors / Q000494:pharmacology; D005898:Glass; D006801:Humans; D037102:Lectins / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D010835:Phytohemagglutinins / Q000037:antagonists & inhibitors / Q000494:pharmacology; D037121:Plant Lectins; D010973:Platelet Adhesiveness / Q000187:drug effects*; D010974:Platelet Aggregation / Q000187:drug effects*; D013696:Temperature
D037102:Lectins; D010835:Phytohemagglutinins; D037121:Plant Lectins; C033619:lentil lectin; D003208:Concanavalin A