Exogenous fibronectin modifies the aggregation of collagen-stimulated human platelets.
Fibronectins (FN) are adhesive glycoproteins whose role in platelet aggregation is unclear. Addition of 3, 6 and 12 micrograms/ml of human plasma FN in vitro to isolated human platelets, which had been freed from plasma FN by gel filtration and subsequently stimulated with collagen, inhibited the last stage of platelet aggregation. With 3 and 6 micrograms/ml of FN a shortening of the lag-time was also observed. These data showed that FN may play a role in platelet-collagen interaction as well as in platelet-platelet interaction.
Eynard
A R
AR
II Catedra de Histologia, Instituto de Biologia Celular (UNC-CONICET), Ciudad Universitaria, Cordoba, Argentina.
Pasqualini
M E
ME
Rovasio
R A
RA
D001792:Blood Platelets / Q000502:physiology; D003094:Collagen / Q000494:pharmacology; D005353:Fibronectins / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D010974:Platelet Aggregation / Q000187:drug effects*; D010975:Platelet Aggregation Inhibitors
D005353:Fibronectins; D010975:Platelet Aggregation Inhibitors; D003094:Collagen