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PI3K/Akt inhibition modulates multidrug resistance and activates NF-kappaB in murine lymphoma cell lines

Mariana G García1, Laura D Alaniz, Rosalía I Cordo Russo

  • 1Cátedra de Inmunología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, IDEHU-CONICET, Junin 956 4 piso, 1113 Ciudad de Buenos Aires, Argentina. marianag@ffyb.uba.ar

Leukemia Research
|July 22, 2008
PubMed

Insights

The phosphatidylinositol 3-kinase (PI3K)/Akt pathway drives multidrug resistance (MDR) in lymphoma. Inhibiting this pathway enhances apoptosis and reduces drug resistance by affecting NF-kappaB and P-glycoprotein.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • The phosphatidylinositol 3-kinase (PI3K)/Akt pathway is implicated in multidrug resistance (MDR) in various cancers.
  • Understanding the interplay between PI3K/Akt, MDR, and NF-kappaB is crucial for developing effective cancer therapies.

Purpose of the Study:

  • To investigate the role of the PI3K/Akt pathway in vincristine and doxorubicin resistance in murine lymphoma cell lines.
  • To analyze the relationship between PI3K/Akt signaling, MDR, and NF-kappaB activity.

Main Methods:

  • Assessing PI3K/Akt activity via phosphatidylinositol trisphosphate production and phosphorylated Akt (p-Akt) expression.
  • Utilizing PI3K inhibitors (wortmannin, LY294002) to evaluate their effects on apoptosis and P-glycoprotein (Pgp) function.
  • Measuring NF-kappaB activity in response to PI3K inhibition.

Main Results:

  • Resistant lymphoma cell lines exhibited higher PI3K/Akt activity compared to sensitive cells.
  • PI3K inhibition significantly enhanced apoptosis in resistant cell lines.
  • Wortmannin and LY294002 inhibited Pgp function and modulated NF-kappaB activity.

Conclusions:

  • The PI3K/Akt pathway is a key contributor to MDR in lymphoma.
  • Inhibition of PI3K/Akt signaling leads to decreased NF-kappaB activity and Pgp function, enhancing chemosensitivity.

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