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[Signal pathways of leukemia cell proliferation induced by ouabain]

Jia-Wei Xu1, Run-Ming Jin, Yan Bai

  • 1Department of Pediatrics, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, Hubei Province, China.

Zhongguo Shi Yan Xue Ye Xue Za Zhi
|April 22, 2009
PubMed

Insights

Ouabain at low doses promotes leukemia cell survival by up-regulating Na(+), K(+)-ATPase alpha1 subunit. Signal pathway inhibitors block this proliferation, indicating Src kinase and ERK1/2 pathways mediate ouabain

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Leukemia cell growth is a complex process involving various signaling pathways.
  • Ouabain, a cardiac glycoside, has demonstrated potential anti-cancer properties.
  • Understanding the specific pathways involved in ouabain's effect on leukemia is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the impact of ouabain and specific signal pathway inhibitors on leukemia cell growth.
  • To elucidate the role of signaling pathways in ouabain-induced proliferation and apoptosis of leukemia cells.
  • To explore the expression of Na(+), K(+)-ATPase alpha1 subunit in leukemia cells treated with ouabain.

Main Methods:

  • Cell viability was assessed using MTT assays after treatment with ouabain and pathway inhibitors.
  • Gene and protein expression of Na(+), K(+)-ATPase alpha1 subunit were evaluated by RT-PCR and Western blot.
  • Specific inhibitors (PP2 and PD98059) were used to block Src kinase and ERK1/2 signaling pathways.

Main Results:

  • Low concentration ouabain (10 nmol/L) enhanced survival rates in lymphocytic leukemia (Jhhan) and megakaryocytic leukemia (M07e) cell lines.
  • Ouabain treatment led to increased expression of the Na(+), K(+)-ATPase alpha1 subunit in these leukemia cells.
  • Inhibition of Src kinase (PP2) and ERK1/2 (PD98059) pathways partially or significantly reduced ouabain-induced leukemia cell proliferation.

Conclusions:

  • Na(+), K(+)-ATPase plays a critical role in signal transduction, mediating leukemia cell growth regulation upon ouabain binding.
  • Ouabain-induced leukemia cell proliferation is dependent on the activation of Src kinase and the ERK1/2 signaling pathway.
  • Targeting these specific pathways could offer novel therapeutic strategies for leukemia treatment.

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