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Activated AKT regulates NF-kappaB activation, p53 inhibition and cell survival in HTLV-1-transformed cells

Soo-Jin Jeong1, Cynthia A Pise-Masison, Michael F Radonovich

  • 1Virus Tumor Biology Section, Laboratory of Cellular Oncology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-5055, USA.

Oncogene
|July 12, 2005
PubMed

Insights

The AKT pathway promotes survival in HTLV-1-transformed cells by activating NF-kappaB and inhibiting p53. Blocking AKT function disrupts these survival signals, offering potential therapeutic targets.

Area of Science:

  • Cell Biology
  • Molecular Oncology
  • Virology

Background:

  • Human T-lymphotropic virus type 1 (HTLV-1) infection is linked to adult T-cell leukemia/lymphoma.
  • AKT activation is crucial for cell survival and resistance to apoptosis.
  • The Tax protein of HTLV-1 plays a significant role in viral pathogenesis.

Purpose of the Study:

  • To investigate the role of AKT activation in HTLV-1-transformed cells.
  • To elucidate the relationship between Tax, AKT, NF-kappaB, and p53 signaling.
  • To explore AKT's contribution to cell survival in HTLV-1 infection.

Main Methods:

  • Overexpression of wild-type (WT) and kinase-dead (KD) AKT mutants.
  • Inhibition of AKT using LY294002 (PI3K/AKT inhibitor) and AKT siRNA.
  • Assessment of NF-kappaB and p53 activity.
  • Analysis of IKKbeta and p65 phosphorylation.
  • Evaluation of Bcl-xL expression.

Main Results:

  • AKT is activated in HTLV-1-transformed cells, with Tax mediating this activation.
  • AKT activation enhances Tax-induced NF-kappaB activation and p53 inhibition.
  • Blocking AKT function prevents NF-kappaB activation and restores p53 activity.
  • AKT influences p53 transcriptional activity and p65 phosphorylation at Ser-536.
  • AKT's prosurvival role is associated with Bcl-xL expression.

Conclusions:

  • AKT signaling is a key mediator of prosurvival pathways in HTLV-1-transformed cells.
  • Tax-mediated AKT activation contributes to NF-kappaB activation and p53 inhibition.
  • Targeting the AKT pathway may represent a therapeutic strategy for HTLV-1-associated malignancies.

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