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Cell Growth & Differentiation, Vol 6, Issue 6 647-653, Copyright © 1995 by American Association of Cancer Research


ARTICLES

Regulation of bcl-2, bcl-XL and bax in the control of apoptosis by hematopoietic cytokines and dexamethasone

J Lotem and L Sachs
Department of Molecular Genetics and Virology, Weizmann Institute of Science, Rehovot, Israel.

Treatment of M1 myeloid leukemic cells with interleukin 6 (IL-6) or dexamethasone (DEX), both of which induce differentiation in these cells, down-regulated expression of the apoptosis-suppressing gene bcl-2 and the apoptosis-promoting gene bax but up-regulated expression of the apoptosis-suppressing gene bcl-XL. There was a higher expression of bcl-XL in cells treated with DEX or DEX plus IL-6 compared to cells treated with IL-6 alone. The alternatively spliced bcl-X gene, bcl-Xs, which interferes with the action of bcl-2, was not expressed. Treatment with IL-6 increased the susceptibility of these cells to induction of apoptosis by Adriamycin or cycloheximide, but treatment with DEX or with IL-6 and DEX did not. Withdrawal of DEX after up-regulation of bcl-XL resulted in a decrease in bcl-XL expression and a concomitant increase in cell susceptibility to induction of apoptosis. Another myeloid leukemia that shows barely detectable expression of bcl-2 also showed up-regulated expression of bcl-XL but no change in bax after induction of differentiation with granulocyte-macrophage colony-stimulating factor, and this reduced cell susceptibility to induction of apoptosis by Adriamycin or cycloheximide. The results indicate that the related apoptosis-regulating genes bcl-2, bcl-XL, and bax are differently regulated and that up-regulation of bcl-XL expression may compensate for down-regulation of bcl-2 in the balance between genes that control apoptosis.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1995 by the American Association of Cancer Research.