Tanaka Y, Kulkeaw K, Inoue T, Tan KS, Nakanishi Y, Shirasawa S, Sugiyama D. Dok2 likely down-regulates Klf1 in
mouse erythroleukemia cells.
Anticancer Res 2014;
34:4561-4567. [PMID:
25075100]
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Abstract
BACKGROUND/AIM
Docking protein 2 (Dok2) is an adapter protein which is involved in hematopoiesis. However, it still remains unclear how Dok2 functions in regulation of transcription of hematopoietic genes. To address this issue, we knocked-down Dok2 mRNA in mouse erythroleukemia cells which highly express Dok2 intrinsically.
MATERIALS AND METHODS
Mouse erythroleukemia cells were transfected with Dok2 siRNA for 24 h and gene expression of erythroid differentiation-related genes, such as GATA binding protein 1 (Gata1), Krüppel-like factor 1 (Klf1), α-globin and β-globin were assessed by real-time polymerase chain reaction.
RESULTS
Among the tested genes, expression of Klf1 exhibited a 1.94-fold increase when compared to the control 24 h after transfection. Immunocytochemistry and chromatin immunoprecipitation assays revealed that Dok2 protein localizes in the nucleus and binds to the promoter region of Klf1 gene.
CONCLUSION
Dok2 is able to control Klf1 expression by transcriptional regulation through directly binding to its promoter region.
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