Up-regulation of Egr1 by 1,25-dihydroxyvitamin D3 contributes to increased expression of p35 activator of cyclin-dependent kinase 5 and consequent onset of the terminal phase of HL60 cell differentiation.
Advances in differentiation therapy of cancer are likely to depend on improved understanding of molecular events that underlie cell differentiation. We reported recently that cyclin-dependent kinase (Cdk)5 and p35Nck5a (p35) are expressed in human leukemia HL60 cells induced to differentiate to monocytes by an exposure to 1,25-dihydroxyvitamin D(3) (1,25D(3)), form a complex, and this complex has kinase activity (F. Chen and G. P. Studzinski, Blood 2001;97:3763). This laboratory has also provided evidence that the extracellular signal-regulated kinase/mitogen-activated protein kinase pathway is active in the early (24-48 h) stages of HL60 cell differentiation induced by 1,25D(3) but declines in the later, terminal phase of this form of differentiation (X. Wang and G. P. Studzinski, J Cell Biochem 2001;80:471). We examine now the hypothesis that Egr1 protein contributes to the up-regulation of p35 gene transcription and, thus, activated Cdk5/p35 kinase phosphorylates and inactivates mitogen-activated protein/extracellular signal-regulated kinase kinase 1 (MEK1). Our data show that in 1,25D(3)-treated cells, p35 and Egr1 protein levels are elevated in a dose-dependent manner at the onset of the late stage of differentiation. We show also that 1,25D(3) treatment of HL60 cells markedly increases the binding of Egr1 to an element in the p35 gene promoter, whereas transfection of an excess of this Egr1-binding oligonucleotide ("promoter decoy") reduces p35 gene transcription and cell differentiation. Additionally, Cdk5/p35 phosphorylates MEK1 and inhibits its ability to phosphorylate its downstream target Erk2. These data suggest that in 1,25D(3)-treated HL60 cells, Egr1 up-regulates p35 gene transcription and that Cdk5/p35 kinase inactivates the extracellular signal-regulated kinase/mitogen-activated protein kinase pathway by phosphorylation of MEK1, and this contributes to terminal differentiation of these cells.
Chen
Fei
F
Department of Pathology and Laboratory Medicine, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, 185 South Orange Avenue, Newark, NJ 07103, USA.
Wang
Qing
Q
Wang
Xuening
X
Studzinski
George P
GP
D002117:Calcitriol / Q000494:pharmacology*; D002120:Calcium Channel Agonists / Q000494:pharmacology*; D002454:Cell Differentiation; D004268:DNA-Binding Proteins / Q000378:metabolism*; D051766:Early Growth Response Protein 1; D024202:Electrophoretic Mobility Shift Assay; D016193:G1 Phase / Q000187:drug effects; D018922:HL-60 Cells; D006801:Humans; D017874:Immediate-Early Proteins / Q000378:metabolism*; D048369:MAP Kinase Kinase 1; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism*; D009000:Monocytes / Q000187:drug effects; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D009841:Oligonucleotides / Q000494:pharmacology; D010766:Phosphorylation / Q000187:drug effects; D015398:Signal Transduction; D014157:Transcription Factors / Q000378:metabolism*; D014162:Transfection; D015854:Up-Regulation
D002120:Calcium Channel Agonists; D004268:DNA-Binding Proteins; C497325:EGR1 protein, human; D051766:Early Growth Response Protein 1; D017874:Immediate-Early Proteins; D009419:Nerve Tissue Proteins; D009841:Oligonucleotides; D014157:Transcription Factors; C089495:neuronal Cdk5 activator (p25-p35); D048369:MAP Kinase Kinase 1; C482125:MAP2K1 protein, human; D020929:Mitogen-Activated Protein Kinase Kinases; D002117:Calcitriol