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Cell Growth & Differentiation, Vol 4, Issue 8 689-697, Copyright © 1993 by American Association of Cancer Research


ARTICLES

Interleukin 6 induces DNA binding activity of AP1 in M1 myeloblastic cells but not in a growth resistant cell derivative [published erratum appears in Cell Growth Differ 1993 Nov;4(11):955]

D Melamed, D Resnitzky, I Haimov, N Levy, CM Pfarr, M Yaniv and A Kimchi
Department of Molecular Genetics and Virology, Weizmann Institute of Science, Rehovot, Israel.

The effects that three different growth inhibitory cytokines exert on expression and function of members of the Jun family were studied in this work. M1 myeloblastic cells were chosen for this purpose because of their high growth sensitivity to interleukin 6 (IL-6), transforming growth factor beta 1 and alpha- and beta-interferons. It is reported here that IL-6 elevated the junB and c-jun mRNA levels and induced the formation of a novel DNA-protein complex with high sequence specificity to 12-O-tetradecanoylphorbol-13-acetate response element (TRE) oligonucleotides. This IL-6 induced TRE binding complex was abolished by anti-Jun specific antibodies and was efficiently competed by an oligonucleotide that comprises the mouse homologue of a previously described human c-myc negative DNA element. It persisted in cells for at least 48 h after IL-6 treatment and failed to be induced by alpha- and beta-interferons or by transforming growth factor beta 1, which affected differently the pattern of jun mRNA expression. To further explore regulatory and functional aspects of this induced TRE binding activity, an IL-6 resistant M1 clone was isolated and further analyzed. This clone carried a postreceptor deficiency that abrogated completely the growth inhibitory responses to IL-6 but did not interfere with the induction of two differentiation related cell surface markers. Interestingly, the IL-6 resistant clone had lost two molecular responses to IL-6, induction of TRE binding activity and suppression of the c-myc gene. The data correlate the IL-6 induced AP1 activity with the suppression of c-myc and growth inhibition.


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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 © 1993 by the American Association of Cancer Research.