Rat Platelets
Mostrando 13-24 de 62 artigos, teses e dissertações.
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13. Studies of activated GPIIb/IIIa receptors on the luminal surface of adherent platelets. Paradoxical loss of luminal receptors when platelets adhere to high density fibrinogen.
The accessibility of activated GPIIb/IIIa receptors on the luminal surface of platelets adherent to damaged blood vessels or atherosclerotic plaques is likely to play a crucial role in subsequent platelet recruitment. To define better the factors involved in this process, we developed a functional assay to assess the presence of activated, luminal GPIIb/IIIa
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14. Neutrophil-dependent acute lung injury. Requirement for P-selectin (GMP-140).
Rapid translocation of P-selectin (GMP-140) from cytoplasmic granules to the cell membrane of endothelial cells promotes adhesive interactions with neutrophils which, when activated, damage the endothelium. The role of P-selectin in lung vascular endothelial injury in rats after systemic activation of complement by intravenous infusion of cobra venom factor
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15. Structural and therapeutic insights from the species specificity and in vivo antithrombotic activity of a novel αIIb-specific αIIbβ3 antagonist
We previously reported on a novel compound (Compound 1; RUC-1) identified by high-throughput screening that inhibits human αIIbβ3. RUC-1 did not inhibit αVβ3, suggesting that it interacts with αIIb, and flexible ligand/rigid protein molecular docking studies supported this speculation. We have now studied RUC-1's effects on murine and rat platelets, whi
American Society of Hematology.
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16. A revised model of platelet aggregation
In this study we have examined the mechanism of platelet aggregation under physiological flow conditions using an in vitro flow-based platelet aggregation assay and an in vivo rat thrombosis model. Our studies demonstrate an unexpected complexity to the platelet aggregation process in which platelets in flowing blood continuously tether, translocate, and/or
American Society for Clinical Investigation.
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17. cGMP mediates the vascular and platelet actions of nitric oxide: confirmation using an inhibitor of the soluble guanylyl cyclase.
The L-arginine:nitric oxide (NO) pathway is believed to exert many of its physiological effects via stimulation of the soluble guanylyl cyclase (SGC); however, the lack of a selective inhibitor of this enzyme has prevented conclusive demonstration of this mechanism of action. We have found that the compound 1H-[1,2,4]oxadiazolo[4,3,-a]quinoxalin-1-one (ODQ)
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18. Platelet alpha-granule fibrinogen, albumin, and immunoglobulin G are not synthesized by rat and mouse megakaryocytes.
It has been assumed that endogenous synthesis by the platelet precursor cell, the bone marrow megakaryocyte, is the major source of platelet alpha-granule protein. To test this hypothesis, we used mRNA phenotyping to detect in megakaryocytes the presence of mRNA transcripts specific for various proteins. Our results indicate that megakaryocytes synthesize pl
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19. Fibrinogen mediated activation of platelet aggregation and thromboxane A2 release: pathological implications in vascular disease.
The effect of a human fibrinogen preparation on in vitro platelet aggregation was assessed. Platelets were obtained from healthy volunteers. Human fibrinogen induced platelet aggregation in 65% of platelet rich plasma samples and enhanced submaximal platelet aggregation induced by heparin or by several conventional agonists in all samples. Aggregation induce
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20. Mesangial cell immune injury. Synthesis, origin, and role of eicosanoids.
The synthesis, cell origin, and physiologic role of eicosanoids were investigated in a model of mesangial cell immune injury induced by a monoclonal antibody against the rat thymocyte antigen Thy 1.1 also expressed in rat mesangial cells. A single intravenous injection of the antibody resulted in enhanced glomerular synthesis of thromboxane (Tx)B2, leukotrie
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21. ADP-ribosylation of an approximately 70-kilodalton protein of Klebsiella pneumoniae.
An approximately 70-kDa protein in the culture supernatant of a human pathogenic strain of Klebsiella pneumoniae was labeled in the presence of [32P-adenylate]NAD. Labeling was significantly increased by the addition of dithiothreitol ( > 1 mM) but prevented by treatment of the culture supernatant for 3 min at 56 degrees C. The addition of unlabeled NAD, but
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22. Correlation between spontaneous metastatic potential, platelet-aggregating activity of cell surface extracts, and cell surface sialylation in 10 metastatic-variant derivatives of a rat renal sarcoma cell line.
Several properties of 10 cell lines derived from the polyoma-induced PW20 Wistar-Furth rat renal sarcoma have been examined, including the ability of the tumor cells to metastasize spontaneously from subcutaneous sites in syngeneic hosts, the platelet-aggregating activity of material extracted by urea from the surface of cultured cells, the sialic acid conte
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23. A patch-clamp study of mammalian platelets and their voltage-gated potassium current.
1. Mammalian platelets were freshly isolated from human, rabbit, or rat blood. The whole-cell and cell-attached voltage-clamp variations of the patch-clamp technique were employed to study the passive electrical properties and ion channels of unstimulated platelets. 2. The input capacitance of a platelet measured by the phase-sensitive detection method was a
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24. Detection of neuropeptide Y and its mRNA in megakaryocytes: enhanced levels in certain autoimmune mice.
Neuropeptide tyrosine (neuropeptide Y, NPY) is a potent vasoconstrictor with a wide distribution in the central and peripheral nervous systems. Here we show that high levels of rat NPY mRNA are also found in peripheral blood cells, bone marrow, lung, and spleen. Furthermore, radioimmunoassay revealed high levels of NPY-like peptide in these tissues. In mice,