Active release of human platelet factor VIII-related antigen by adenosine diphosphate, collagen, and thrombin.
نویسندگان
چکیده
منابع مشابه
Released adenosine diphosphate stabilizes thrombin-induced human platelet aggregates.
Normal human platelets aggregated by thrombin undergo the release reaction and are not readily deaggregated by the combination of inhibitors hirudin, chymotrypsin, and prostaglandin E1 (PGE1). In contrast, thrombin-induced aggregates of platelets from patients with delta-storage pool deficiency (delta-SPD), which lack releasable nucleotides, are readily deaggregated by the same combination of i...
متن کاملThrombin-mediated release of factor VIII antigen from human umbilical vein endothelial cells in culture.
We have examined the effects of purified human alpha-thrombin on factor VIII antigen (FVIII-Ag) release by human umbilical vein endothelial cells in culture. Alpha-thrombin induced a time and dose-dependent release of FVIII-Ag into supernatant medium. Alpha-thrombin-mediated FVIII-Ag release was not dependent on protein synthesis and was observed in both serum-free and serum-containing media. F...
متن کاملErythrocytes metabolically enhance collagen-induced platelet responsiveness via increased thromboxane production, adenosine diphosphate release, and recruitment.
Erythrocytes promoted platelet reactivity in a plasma medium, as demonstrated in an in vitro system that independently evaluated the biochemistry of platelet activation and recruitment. The prothrombotic erythrocyte effects were metabolically regulated, as evidenced by lack of activity of ATP-depleted or glutaraldehyde-fixed erythrocytes. They occurred in the absence of cell lysis as verified b...
متن کاملPlatelet-collagen interactions: increase in rate of adhesion of fixed washed platelets by factor VIII-related antigen.
A simple technique using an aggregometer and fixed washed human platelets (FWP) and fibrillar collagen has been used to evaluate the contribution of the two components of the factor VIII (FVIII) complex to platelet-collagen interactions. FWP bound individually to collagen fibrils in suspension, and both the total number of FWP bound and the rate of adhesion increased with increasing collagen co...
متن کاملFurther observations on platelet aggregation induced by adenosine diphosphate thrombin and tri-ethyl tin.
Aggregation induced by adenosine diphosphate is inhibited by adenosine as well as by adenosine mono- and triphosphate. Thrombin-induced aggregation is also inhibited by adenosine and the monophosphate, but the triphosphate at a similar concentration is not inhibitory. Aggregation induced by tri-ethyl tin is accelerated by a critical concentration of triphosphate and delayed by a higher concentr...
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ژورنال
عنوان ژورنال: Journal of Clinical Investigation
سال: 1978
ISSN: 0021-9738
DOI: 10.1172/jci109246