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• W1995804969 abstract "Mature megakaryocytes form structures called proplatelets that serve as conduits for platelet packaging and release at vascular sinusoids. Since the megakaryocyte expresses abundant levels of integrin αIIbβ3, we have examined a role for fibrinogen in proplatelet development and platelet release alongside that of other matrices. Primary mature murine megakaryocytes from bone marrow aspirates readily formed proplatelets when plated on fibrinogen at a degree that was significantly higher than that seen on other matrices. In addition, αIIbβ3 was essential for proplatelet formation on fibrinogen, as megakaryocytes failed to develop proplatelets in the presence of αIIbβ3 antagonists. Interestingly, inhibition of Src kinases or Ca2+ release did not inhibit proplatelet formation, indicating that αIIbβ3-mediated outside-in signals are not required for this response. Immunohistochemical studies demonstrated that fibrinogen is localized to the bone marrow sinusoids, a location that would allow it to readily influence platelet release. Further, thrombopoietin-stimulated αIIb-/- mice had a reduced increase in platelet number relative to controls. A similar observation was not observed for platelet recovery in αIIb-/- mice in response to antibody-induced thrombocytopenia, indicating the existence of additional pathways of regulation of proplatelet formation. These results demonstrate that fibrinogen is able to regulate proplatelet formation via integrin αIIbβ3." @default.
• W1995804969 created "2016-06-24" @default.
• W1995804969 creator A5057799772 @default.
• W1995804969 creator A5057968833 @default.
• W1995804969 date "2006-09-01" @default.
• W1995804969 modified "2023-10-18" @default.
• W1995804969 title "Regulation of proplatelet formation and platelet release by integrin αIIbβ3" @default.
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• W1995804969 doi "https://doi.org/10.1182/blood-2005-11-011957" @default.
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