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Journal of Cell Science, Vol 110, Issue 5 681-686, Copyright © 1997 by Company of Biologists

JOURNAL ARTICLES

Glucose deprivation-induced cytotoxicity in drug resistant human breast carcinoma MCF-7/ADR cells: role of c-myc and bcl-2 in apoptotic cell death

YJ Lee, SS Galoforo, CM Berns, WP Tong, HR Kim and PM Corry
Department of Radiation Oncology, William Beaumont Hospital, Royal Oak, Michigan 48073, USA.

We investigated the effect of glucose deprivation treatment on clonogenicity in multidrug-resistant human breast carcinoma MCF-7/ADR cells. Survival of MCF-7/ADR cells decreased exponentially up to 8 hours of incubation in the glucose-free medium. The surviving fraction of these cells for 8 hours of glucose-deprivation treatment was 1.5 x 10(-3). Photomicrographs and gel electrophoresis data suggest that glucose deprivation-induced cell death is associated with apoptosis. Data from western and northern blots showed an induction of c-myc gene expression during treatment with glucose-free medium in MCF-7/ADR cells. MCF-7/ADR cells transfected with c-myc antisense oligodeoxynucleotides became resistant to glucose deprivation-induced apoptosis. Overexpression of bcl-2 gene protected MCF-7/ADR cells from this apoptotic cell death. Taken together, these results indicate that c-myc expression is a necessary component of glucose-free medium induced apoptosis and bcl-2 prevents apoptotic death induced by c-myc.


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© The Company of Biologists Ltd 1997