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Constitutive NF-kappaB DNA-binding activity in AML is frequently mediated by a Ras/PI3-K/PKB-dependent pathway

K U Birkenkamp1, M Geugien, H Schepers

  • 1Division of Hematology, Department of Medicine, University of Groningen, The Netherlands.

Leukemia
|October 24, 2003
PubMed

Insights

Constitutive NF-kappaB DNA-binding activity in acute myeloid leukemia (AML) cells is linked to apoptosis resistance. Targeting the Ras/PI3K/PKB pathway, often activated by N-Ras mutations, can inhibit NF-kappaB and enhance chemotherapy effectiveness.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Constitutive Nuclear Factor-kappa B (NF-kappaB) DNA-binding activity is prevalent in acute myeloid leukemia (AML) cells.
  • This activity is often associated with resistance to spontaneous apoptosis, posing a therapeutic challenge.

Purpose of the Study:

  • To elucidate the specific molecular mechanisms driving constitutive NF-kappaB DNA-binding activity in AML.
  • To identify potential therapeutic targets within aberrant signaling pathways for AML treatment.

Main Methods:

  • Investigated NF-kappaB DNA-binding activity in 22 AML cases.
  • Utilized NF-kappaB inhibitor (SN-50 peptide), PI3-K inhibitor (Ly294002), and Ras inhibitor (L-744832).
  • Analyzed Ras GTP-ase mutations and assessed the impact of growth factors and Flt3 receptor mutations.

Main Results:

  • NF-kappaB activity was found in 73% of AML cases, correlating with apoptosis resistance.
  • Inhibition of NF-kappaB enhanced chemotherapy-induced apoptosis.
  • The Ras/PI3-kinase (PI3-K)/protein kinase B (PKB) pathway mediated NF-kappaB activity in most cases.
  • N-Ras mutations were identified in 29% of cases, causing Ras activation.

Conclusions:

  • Ras activation is a key pathway for triggering NF-kappaB in AML cells.
  • Targeting the Ras/PI3-K/PKB pathway offers a potential strategy to overcome apoptosis resistance in AML.
  • Further research into N-Ras mutations and NF-kappaB inhibition is warranted for AML therapy.

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