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- W2012367507 abstract "Previous work has shown increased uptake of hypotonically loaded rat RBCs by the spleen and liver “in vivo, ” suggesting that the cells of MPS are involved in their elimination from the circulation. In order to elucidate the mechanism of such elimination, we have undertaken studies on the interaction of such loaded RBCs, in comparison with native RBCs, with peritoneal macrophages. Erythrophagocytosis assays were performed in well plates to which thioglycollate-induced peritoneal macrophages had adhered. Native or loaded 51CrRBCs were added under different opsonization conditions to monolayer adherent macrophages, and then the amount of RBCs that were recognized was determined, with separation into adhesion and phagocytosis fractions. Native RBCs are slightly recognized by peritoneal macrophages, about one RBC per macrophage (MΦ). Osmotic treatment of rat RBCs used for encapsulation (independently of the encapsulated substance, 125I-CA or FITC-dextran) produces some modification in the erythrocyte membrane that induces higher recognition of these cells, about three loaded RBCs per macrophage. Consequently, both fluorescent (FITC-Dx) and radioactive (125I-CA) substances previously encapsulated in RBCs were transferred to MΦs. The fluorescence microscopic observations confirmed these results. Moreover, in the case of carrier 51Cr-cells loaded with 125I-CA, the amount of 125 I-radioactivity delivered into MΦs was relatively higher than that of 51Cr. The highest ratio, 125I-CA (encapsulated substance)/51Cr-RBCs (carrier cells), present in MΦs means there was a stronger interaction with macrophages of RBCs that carry a higher amount of encapsulated CA, as a function of the heterogeneity of the loaded rat RBCs population previously reported. Finally, the adhesion and phagocytosis of loaded RBCs seem not to involve complement receptors or Fc receptors on the macrophages." @default.
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- W2012367507 date "1998-02-01" @default.
- W2012367507 modified "2023-09-27" @default.
- W2012367507 title "Hypotonically Loaded Rat Erythrocytes Deliver Encapsulated Substances into Peritoneal Macrophages" @default.
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- W2012367507 doi "https://doi.org/10.1093/oxfordjournals.jbchem.a021927" @default.
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