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. 1971 Sep 1;50(3):804–817. doi: 10.1083/jcb.50.3.804

ENDOCYTOSIS IN CHANG LIVER CELLS

Quantitation by Sucrose-3H Uptake and Inhibition by Cytochalasin B

Roger Wagner 1, Murray Rosenberg 1, Richard Estensen 1
PMCID: PMC2108291  PMID: 4329157

Abstract

The addition of 0.08 M sucrose to a culture medium containing Chang-strain human liver cells causes intense cytoplasmic vacuolation. Electron microscopy of these cells grown inferritin, time-lapse cinematography, and radioautography reveal that the vacuoles arise by endocytosis and that the sucrose is taken into the cell and localized in the vacuoles. Tracer studies demonstrate that sucrose-3H provides a marker for quantitation of endocytosis and that it neither induces nor stimulates endocytosis. Electron micrographs of vacuolated liver cells show microfilaments in close proximity to the inside of the plasma membrane, in the pseudopodia, and to the cytoplasmic side of the membrane surrounding endocytosis vacuoles. Cytochalasin B (CB), a mold metabolite that inhibits various types of cell motility, has a dose-dependent inhibitory effect on the uptake of sucrose-3H by these cells. This inhibition is accompanied by a cessation of the movement of ruffles and pseudopodia on the surface of the cells and the formation of blebs which arise from the cell's surface. These morphological changes are quickly reversible upon removal of CB. Alterations in the appearance and location of microfilaments are also observed in CB-treated cells.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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