A conditionally-active form of MEK1 results in autocrine transformation of human and mouse hematopoietic cells

William L. Blalock, Marianne Pearce, Linda S. Steelman, Richard A. Franklin, Sean A. McCarthy, Holly Cherwinski, Martin McMahon, James A. McCubrey

Research output: Contribution to journalArticle

Abstract

The Raf/MEK/MAP kinase cascade plays a critical role in transducing growth signals from activated cell surface receptors. Using ΔMEK1:ER, a conditionally-active form of MEK1, we demonstrate the ability of this dual specificity protein kinase to abrogate the cytokine-dependency of the human and murine hematopoietic cells lines TF-1, FDC-P1 and FL5.12. Cytokine-independent cells were obtained from TF-1, FDC-P1 and FL5.12 cells at frequencies of 2.5 x 10-3, 5 x 10-5 and 10-7 respectively, indicating that not all cells expressing ΔMEK1:ER were factor-independent. In general, cells that were converted to a cytokine-independent phenotype displayed a higher level of MAP kinase activity in response to ΔMEK1:ER activation than those that remained cytokine-dependent. ΔME-K1:ER-responsive cells could be maintained long-term in the presence of β-estradiol as well as the estrogen-receptor antagonist 4-Hydroxy-Tamoxifen and the antiestrogen ICI 164383. Removal of hormone led to the rapid cessation of cell. growth in a manner similar to that observed when cytokine is withdrawn from the parental cells. Treatment of ΔMEK1:ER-responsive cells with a specific and selective inhibitor, PD98059, prevented growth in response to β-estradiol. GM-CSF mRNA transcripts were detected in the MEK1-responsive cells indicating that the activated ΔMEK1:ER may induce a pathway leading to autocrine proliferation. Treatment of MEK1-responsive cells with an anti-GM-CSF antibody, but not a control antibody, suppressed cell growth. The cell lines described here will be useful for elaborating the ability of the MAP kinase pathway to regulate cell proliferation in hematopoietic cells.

Original languageEnglish
Pages (from-to)526-536
Number of pages11
JournalOncogene
Volume19
Issue number4
Publication statusPublished - Jan 27 2000

Fingerprint

Cytokines
Granulocyte-Macrophage Colony-Stimulating Factor
Growth
Estradiol
Phosphotransferases
MAP Kinase Kinase Kinases
Cell Line
Estrogen Receptor Modulators
MAP Kinase Signaling System
Antibodies
Cell Surface Receptors
Protein Kinases
Cell Proliferation
Hormones
Phenotype
Messenger RNA

Keywords

  • Cytokines
  • MEK1
  • Oncogenes
  • Signal transduction

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

Cite this

Blalock, W. L., Pearce, M., Steelman, L. S., Franklin, R. A., McCarthy, S. A., Cherwinski, H., ... McCubrey, J. A. (2000). A conditionally-active form of MEK1 results in autocrine transformation of human and mouse hematopoietic cells. Oncogene, 19(4), 526-536.

A conditionally-active form of MEK1 results in autocrine transformation of human and mouse hematopoietic cells. / Blalock, William L.; Pearce, Marianne; Steelman, Linda S.; Franklin, Richard A.; McCarthy, Sean A.; Cherwinski, Holly; McMahon, Martin; McCubrey, James A.

In: Oncogene, Vol. 19, No. 4, 27.01.2000, p. 526-536.

Research output: Contribution to journalArticle

Blalock, WL, Pearce, M, Steelman, LS, Franklin, RA, McCarthy, SA, Cherwinski, H, McMahon, M & McCubrey, JA 2000, 'A conditionally-active form of MEK1 results in autocrine transformation of human and mouse hematopoietic cells', Oncogene, vol. 19, no. 4, pp. 526-536.
Blalock WL, Pearce M, Steelman LS, Franklin RA, McCarthy SA, Cherwinski H et al. A conditionally-active form of MEK1 results in autocrine transformation of human and mouse hematopoietic cells. Oncogene. 2000 Jan 27;19(4):526-536.
Blalock, William L. ; Pearce, Marianne ; Steelman, Linda S. ; Franklin, Richard A. ; McCarthy, Sean A. ; Cherwinski, Holly ; McMahon, Martin ; McCubrey, James A. / A conditionally-active form of MEK1 results in autocrine transformation of human and mouse hematopoietic cells. In: Oncogene. 2000 ; Vol. 19, No. 4. pp. 526-536.
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