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- W2237444389 abstract "Abstract The association of fibrinogen with washed human platelets was examined by immunocytochemistry during aggregation induced by adenosine diphosphate (ADP) and during deaggregation. The platelets were suspended either in a medium containing 2 mmol/L Ca2+ or in a medium containing no added Ca2+ (20 mumol/L Ca2+). Platelets were fixed at several times during aggregation and deaggregation, embedded in Lowicryl K4M, sectioned, incubated with goat antihuman fibrinogen, washed, reacted with gold-labeled antigoat IgG, and prepared for electron microscopy. To determine whether the method detected fibrinogen associated with the platelets, the platelets were pretreated with chymotrypsin (10 U/mL) and aggregated by fibrinogen; gold particles were apparent not only in the alpha granules but on the platelet surface and between adherent platelets as well. In the medium with 2 mmol/L Ca2+, ADP caused extensive aggregation of normal platelets in the presence of fibrinogen (0.4 mg/mL), and gold particles were evident between the adherent platelets and on the platelet surface; when the platelets deaggregated, gold was no longer present on the surface. In a medium without added Ca2+, ADP caused extensive aggregation in the presence of fibrinogen, and large numbers of gold particles were on the platelet surface and even more between adherent platelets. In this medium, the platelets did not deaggregate, and by five minutes, the granules appeared to be swollen or fused. In the absence of external fibrinogen, ADP caused the formation of small aggregates, and fibrinogen was not detected between adherent platelets. Thus, the association of fibrinogen with the platelet surface enhances platelet aggregation but is not essential for the ADP-induced formation of small aggregates. The association of fibrinogen with platelets is greater under conditions in which platelets release their granule contents and do not deaggregate because both endogenous and exogenous fibrinogen take part in aggregation." @default.
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- W2237444389 date "1988-04-01" @default.
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- W2237444389 title "Immunocytochemical localization of fibrinogen on washed human platelets. Lack of requirement for fibrinogen during adenosine diphosphate-induced responses and enhanced fibrinogen binding in a medium with low calcium levels" @default.
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- W2237444389 doi "https://doi.org/10.1182/blood.v71.4.850.850" @default.
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