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- W2029592833 abstract "To study the transfer of phagocytosed components from phagosomes to lysosomes, we have investigated phagocytosis by rat liver of killed Staphylococcus aureus labelled with (125)I tyramine cellobiose. Lysosomes were identified by injecting the animals with Triton WR1339, a non ionic detergent that is endocytosed by the liver and accumulates in lysosomes, causing a marked decrease of their density; that allows these organelles to be well separated from other particles in a density gradient. Bacteria were quickly taken up by the liver; their uptake is followed by a slow degradation as ascertained by the increase of acid-soluble radioactivity in the homogenates with time. Triton WR1339 injection does not affect the uptake and the degradation of the particles. Differential centrifugation of homogenates shows that at any time after injection, most of the radioactivity is recovered in the mitochondrial fractions. Distributions of acid precipitable and acid soluble radioactivities amongst subcellular structures present in mitochondrial fractions were studied by isopycnic centrifugation in sucrose gradients, at increasing times after bacteria injection. Results show that: 1) acid-precipitable radioactivity is quasi-exclusively present in gradient fractions of high density, well separated from the fractions where there are recovered lysosomes; 2) with time, acid-soluble radioactivity is more and more associated with lysosomes, however, a significant proportion can be detected for many hours after injection, in gradient fractions where acid-precipitable radioactivity is located. The most plausible explanation of our observations is that phagocytosed particles are degraded in phagosomes and that the degradation products are delivered to lysosomes, probably by a vesicular process." @default.
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- W2029592833 date "1996-03-01" @default.
- W2029592833 modified "2023-10-14" @default.
- W2029592833 title "Phagocytosis by Rat Liver: Relationships between Phagosomes and Lysosomes" @default.
- W2029592833 doi "https://doi.org/10.1006/bbrc.1996.0444" @default.
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