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[MAPK signal pathway plays a role in proliferation of Jurkat cells induced by ouabain]

Run-Ming Jin1, Yan Bai, An-Xiu Xiong

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

Zhongguo Shi Yan Xue Ye Xue Za Zhi
|March 8, 2005
PubMed

Insights

Low-concentration ouabain promotes Jurkat cell proliferation by activating the MAPK pathway and influencing c-myc gene expression, offering insights into T-cell leukemia mechanisms.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Pharmacology

Context:

  • Jurkat cells are a human T-cell leukemia line frequently used in immunological and cancer research.
  • Ouabain, a cardiac glycoside, is known to inhibit Na+, K+-ATPase, but its effects on immune cells are less understood.
  • Understanding the molecular mechanisms of T-cell proliferation is crucial for developing targeted therapies.

Purpose:

  • To investigate the effects of low-concentration ouabain on Jurkat cell proliferation.
  • To elucidate the underlying molecular mechanisms, including the involvement of the MAPK signaling pathway and c-myc gene expression.
  • To explore the potential role of Na+, K+-ATPase in mediating ouabain's effects on Jurkat cells.

Summary:

  • Low-concentration ouabain was found to induce Jurkat cell proliferation in a time- and dose-dependent manner, confirmed by MTT assays.
  • RT-PCR and Western blot analyses revealed that ouabain enhances the phosphorylation of MAPK (ERK1/2) and increases c-myc gene expression.
  • These findings suggest that ouabain stimulates Jurkat cell proliferation via the intracellular MAPK signaling pathway, potentially involving c-myc regulation, by acting on Na+, K+-ATPase.

Impact:

  • Provides novel insights into the proliferative effects of ouabain on Jurkat cells, a key model for T-cell leukemia.
  • Identifies the MAPK signaling pathway and c-myc gene as critical mediators of ouabain-induced Jurkat cell growth.
  • Suggests potential therapeutic strategies targeting Na+, K+-ATPase or the MAPK pathway in T-cell malignancies.

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