Identification of TAXREB107 as an Erythropoietin Early Response Gene

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Abstract
The protooncogenes c-myc and c-myb are erythropoietin (Epo)-regulated early response genes. They appear to play distinct roles in the growth- and differentiation-inducing signals of the hormone. Using a subtractive hybridization strategy, we have identified the murine homolog of the TAX response element-binding protein TAXREB107 as an Epo early response gene in Rauscher murine erythroleukemia cells. This was confirmed by Northern blot analyses, which showed a fourfold increase in TAXREB107 mRNA after 1 hr of erythropoietin treatment. After 3 hr the transcript had decreased to approximately twofold above control levels. Inhibition of this induction with antisense oligodeoxynucleotides increased Epo-induced hemoglobinization 2.5-fold. The results implicate TAXREB107 in erythropoiesis and support the hypothesis that the TAXREB proteins have functions outside the context of HTLV-I infection.