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- W2018218096 abstract "Wistar Furth (WF) rats have an abnormal thrombopoietic phenotype with morphologically aberrant megakaryocytes, larger than normal mean platelet volume, and platelet alpha-granule protein deficiency. Here, ultrastructural comparisons of WF rat megakaryocytes to those of rats (Wistar) with normal platelet formation during stimulated megakaryocytopoiesis following 5-fluorouracil administration, have revealed a previously unrecognized membrane structure in normal rat megakaryocytes, and two additional abnormalities in WF megakaryocytes. The novel structures were zones of electron density on the cytoplasmic face of apposed plasma membranes of adjoining normal megakaryocytes. These modified focal adhesion-type contacts were distributed at intervals between adjacent megakaryocytes, and were spaced by deposits of extracellular material. These structures also were present between apposed plasma membranes of Wistar rat megakaryocytes in unperturbed marrows, but were absent between megakaryocytes of WF rats. The second WF rat megakaryocyte abnormality is the absence of cytoplasmic dense compartments, another specialized membranous structure that is continuous with the megakaryocyte demarcation membrane system. Both the intercellular plaques and dense compartments of Wistar rat megakaryocytes were found to be rich in cytoskeletal proteins including actin, α-actinin, talin, and vinculin as indicated by ultrastructural immunogold labeling. We hypothesize that an abnormality in cytoskeletal protein function may be responsible for the lack of these structures in the WF rat." @default.
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- W2018218096 date "1998-01-01" @default.
- W2018218096 modified "2023-09-23" @default.
- W2018218096 title "Wistar Furth Rat Megakaryocytes Lack Dense Compartments and Intercellular Plaques, Membranous Structures Rich in Cytoskeletal Proteins" @default.
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- W2018218096 doi "https://doi.org/10.3109/15419069809010784" @default.
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