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Autocrine Growth Induced by Kinase Type Oncogenes in Myeloid Cells Requires AP-1 and NF-M, a Myeloid Specific, C/EBP-like Factor

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Journal EMBO J
Date 1992 Jan 1
PMID 1346759
Citations 38
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Abstract

The nuclear oncogenes v-myc or v-myb specifically transform avian myeloid cells. In both cases, the transformed cells remain dependent on chicken myelomonocytic growth factor (cMGF). This factor dependence can be relieved by expression of kinase-type oncogenes such as v-mil or v-erbB, leading to expression of cMGF and autocrine growth stimulation. In erythroid cells the same kinase-type oncogenes cause transformation but do not induce cMGF expression. Here we investigated the molecular mechanisms of the observed lineage specific oncogene collaboration. We found that kinase-type oncogenes and TPA activate the cMGF promoter via AP-1 like transcription factors. The activation of the cMGF promoter is, however, strictly dependent on the binding of nuclear proteins to both halves of an inverted repeat adjacent to the AP-1 binding site. These proteins are related to C/EBP. They are expressed exclusively in myeloid cells and were therefore termed NF-M. Our results indicate that the lineage specific cooperation of kinase type oncogenes with v-myb or v-myc in leukemia formation is based on the concerted action of AP-1 and NF-M on the cMGF promoter.

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