cAMP differentially regulates γ-globin gene expression in erythroleukemic cells and primary erythroblasts through c-Myb expression

Yuichi Kuroyanagi, Yuji Kaneko, Kenjiro Muta, Buem Seek Park, Paolo Moi, Sabrina Ausenda, Maria D. Cappellini, Tohru Ikuta

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


Our previous studies demonstrated roles of cyclic nucleotides in γ-globin gene expression. We recently found that, upon activation of the cAMP pathway, expression of the γ-globin gene is inhibited in K562 cells but induced in adult erythroblasts. Here we show that c-Myb, a proto-oncogene product that plays a role in cell growth and differentiation, is involved in the cAMP-mediated differential regulation of γ-globin gene expression in K562 cells and primary erythroblasts. Our studies found that c-Myb is expressed at a high level in K562 cells compared to primary erythroblasts, and that c-Myb expression is further increased following the treatment with forskolin, an adenylate cyclase activator. The induction of γ-globin gene expression was also inhibited in K562 cells by raising the levels of c-Myb expression. Importantly, forskolin-induced erythroid differentiation in K562 cells, as determined by the expression of glycophorins and CD71, suggesting that high-level expression of c-Myb may not be sufficient to inhibit the differentiation of erythroid cells. In contrast, c-Myb was not expressed in adult erythroblasts treated with forskolin and primary erythroblasts may lack the c-Myb-mediated inhibitory mechanism for γ-globin gene expression. Together, these results show that the cAMP pathway blocks γ-globin gene expression in K562 cells by increasing c-Myb expression and c-Myb plays a role in defining the mode of response of the γ-globin gene to fetal hemoglobin inducers in erythroid cells.

Original languageEnglish (US)
Pages (from-to)1038-1047
Number of pages10
JournalBiochemical and Biophysical Research Communications
Issue number3
StatePublished - Jun 9 2006


  • Erythroleukemic cells
  • Primary erythroblasts
  • c-Myb
  • cAMP
  • γ-Globin gene

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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