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p21(Cip1) confers resistance to imatinib in human chronic myeloid leukemia cells

Nuria Ferrandiz1, Juan M Caraballo, Marta Albajar

  • 1Departamento de Biología Molecular, Facultad de Medicina, Instituto de Biomedicina y Biotecnología de Cantabria, Universidad de Cantabria-CSIC-IDICAN, Santander, Spain.

Cancer Letters
|January 1, 2010
PubMed

Insights

Imatinib down-regulates p21(Cip1) in chronic myeloid leukemia (CML) cells. p21(Cip1) partially protects CML cells from imatinib-induced apoptosis, suggesting its involvement in treatment response.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Imatinib is a primary therapy for chronic myeloid leukemia (CML).
  • p21(Cip1) acts as a cell cycle inhibitor and can prevent apoptosis in certain contexts.
  • The role of p21(Cip1) in CML response to imatinib is not fully understood.

Purpose of the Study:

  • To investigate the effect of imatinib on p21(Cip1) expression in CML cells.
  • To determine if p21(Cip1) influences the sensitivity of CML cells to imatinib-induced apoptosis.

Main Methods:

  • Analysis of p21(Cip1) expression in CML cells treated with imatinib.
  • Utilizing K562 cells with inducible p21 expression.
  • Employing transient transfection techniques.

Main Results:

  • Imatinib treatment leads to decreased p21(Cip1) expression in CML cells.
  • p21(Cip1) expression confers partial resistance to imatinib-induced apoptosis.
  • This resistance is independent of G2-arrest, altered imatinib activity against Bcr-Abl, or p21(Cip1) subcellular localization.

Conclusions:

  • p21(Cip1) plays a role in modulating the apoptotic response to imatinib in CML.
  • Understanding the p21(Cip1)-imatinib interaction may offer insights into CML treatment resistance.

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