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Journal of Cell Science, Vol 107, Issue 12 3315-3324, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
LJ Mandel, RB Doctor and R Bacallao
Department of Cell Biology, Duke University Medical Center, Durham, NC 27710.
MDCK and JTC cells were subjected to ATP depletion by treating the cells with 10 microM antimycin A and 10 mM 2-deoxyglucose. As visualized by confocal fluorescence microscopy, E-cadherin and Na+,K(+)-ATPase were rapidly internalized following depletion of the intracellular ATP stores. The time course of internalization was similar to the depolymerization of the cortical actin network and dissolution of the actin ring (see companion paper, this volume, pp. 3301-3313). Cell surface biotinylation was used to assay the amount of surface-accessible E-cadherin and Na+,K(+)-ATPase during ATP depletion. At 30 minutes of ATP depletion, 74% and 69% of E-cadherin and Na+,K(+)-ATPase were internalized, respectively, in MDCK cells. By 60 minutes of ATP depletion, internalization increased to 95% and 89%, respectively. The redistribution of both plasma membrane proteins was not microtubule dependent. Similar results were observed in JTC cells. Total biotinylated protein decreased by 67% and 82%, after 30 minutes and 60 minutes of ATP depletion, respectively. The E-cadherin internalization strongly suggests that disruption of adherens junctions occurred following ATP depletion. These results, along with the previously described loss of tight junction integrity, suggest that ATP depletion may be a useful method to study the assembly and disassembly of junctional complexes in epithelial cells.
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