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Mcl-1 is a common target of stem cell factor and interleukin-5 for apoptosis prevention activity via MEK/MAPK and

H M Huang1, C J Huang, J J Yen

  • 1Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.

Blood
|August 29, 2000
PubMed

Insights

Stem cell factor (SCF) and interleukin-5 (IL-5) prevent cell death by upregulating Mcl-1. This involves MEK/MAPK and PI-3K/Akt pathways, crucial for Mcl-1 expression and cell survival in hematopoiesis.

Area of Science:

  • Hematology
  • Molecular Biology
  • Cell Biology

Background:

  • Stem cell factor (SCF) is vital for hematopoietic lineage production, primarily through apoptosis prevention when combined with other cytokines.
  • The precise mechanism behind SCF's synergistic anti-apoptotic effect remains largely unknown.
  • This study investigates the role of Bcl-2 family members in SCF-mediated apoptosis prevention.

Purpose of the Study:

  • To elucidate the mechanism of SCF's synergistic apoptosis prevention with other cytokines.
  • To examine the expression of Bcl-2 family proteins (Bcl-2, Bcl-X(L), Mcl-1, Bax) in response to cytokine stimulation.
  • To identify the signaling pathways involved in SCF- and IL-5-mediated cell survival.

Main Methods:

  • Analyzed Bcl-2 family member expression in TF-1 and JYTF-1 cells under cytokine stimulation.
  • Investigated the phosphorylation status of JAK, STAT5, MAPK, and Akt/PKB signaling molecules.
  • Utilized MEK inhibitor (PD98059) and PI-3K inhibitor (LY294002) to assess pathway involvement.

Main Results:

  • Mcl-1 expression strongly correlated with the antiapoptotic activity of IL-5 and the synergistic effect of SCF.
  • In TF-1 cells, impaired IL-5 signaling affected Mcl-1 induction and apoptosis suppression.
  • SCF costimulation restored MAPK and Akt/PKB phosphorylation, crucial for Mcl-1 expression and cell survival, while STAT5 phosphorylation remained impaired.
  • Inhibition of MEK/MAPK or PI-3K/Akt pathways reduced Mcl-1 expression and cell viability.

Conclusions:

  • Mcl-1 serves as a common antiapoptotic target for both SCF and IL-5.
  • The MEK/MAPK and PI-3K/Akt signaling pathways are essential for regulating Mcl-1 expression and preventing apoptosis.
  • Understanding these pathways is critical for optimizing hematopoietic cell production and survival.

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