TY - JOUR
T1 - Isolation of human platelet membrane microparticles from plasma and serum
AU - George, J. N.
AU - Thoi, L. L.
AU - McManus, L. M.
AU - Reimann, T. A.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 1982
Y1 - 1982
N2 - Methods have been developed to isolate human platelet membrane fragments from plasma and serum. Rabbit antibody produced against the human platelet membrane glycoprotein complex, IIb/IIIa, was utilized in an immunoelectrophoretic assay to evaluate the amount of this antigen in various microparticle preparations. The serum concentration of platelet microparticles was more than tenfold greater than that observed for plasma (65 μg/ml versus 4.4 μg/ml, respectively). Ultrastructural evaluation of either plasma or serum derived microparticles disclosed a variety of membrane fragments and membrane-bound vesicles with occasional fragments of red blood cells, white blood cells, and platelets. In contrast, microparticle preparations derived from isolated washed platelets after thrombin stimulation contained a heterogeneous array of membrane fragments, vesicles, and granules but no identifiable red cell, white cell, or platelet fragments. Thus, these studies demonstrate that normal plasma and serum contain platelet membrane fragments that are produced during cell activation. If a similar loss of platelet membranes occurs in vivo following reversible platelet activation, it is possible that the resulting membrane modifications may be of importance in both the structural and functional changes that develop during platelet senescence.
AB - Methods have been developed to isolate human platelet membrane fragments from plasma and serum. Rabbit antibody produced against the human platelet membrane glycoprotein complex, IIb/IIIa, was utilized in an immunoelectrophoretic assay to evaluate the amount of this antigen in various microparticle preparations. The serum concentration of platelet microparticles was more than tenfold greater than that observed for plasma (65 μg/ml versus 4.4 μg/ml, respectively). Ultrastructural evaluation of either plasma or serum derived microparticles disclosed a variety of membrane fragments and membrane-bound vesicles with occasional fragments of red blood cells, white blood cells, and platelets. In contrast, microparticle preparations derived from isolated washed platelets after thrombin stimulation contained a heterogeneous array of membrane fragments, vesicles, and granules but no identifiable red cell, white cell, or platelet fragments. Thus, these studies demonstrate that normal plasma and serum contain platelet membrane fragments that are produced during cell activation. If a similar loss of platelet membranes occurs in vivo following reversible platelet activation, it is possible that the resulting membrane modifications may be of importance in both the structural and functional changes that develop during platelet senescence.
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U2 - 10.1182/blood.v60.4.834.bloodjournal604834
DO - 10.1182/blood.v60.4.834.bloodjournal604834
M3 - Article
C2 - 7115953
AN - SCOPUS:0019930602
VL - 60
SP - 834
EP - 840
JO - Blood
JF - Blood
SN - 0006-4971
IS - 4
ER -