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Class IA PI3K inhibition inhibits cell growth and proliferation in mantle cell lymphoma

Yoko Tabe1, Linhua Jin, Marina Konopleva

  • 1Department of Clinical Laboratory Medicine, Juntendo University School of Medicine, Tokyo, Japan.

Acta Haematologica
|September 21, 2013
PubMed
Abstract

Insights

Targeting class IA phosphatidylinositol 3-kinase (PI3K) isoforms, particularly p110α, shows promise for treating aggressive mantle cell lymphoma (MCL). Inhibiting these isoforms effectively reduces MCL cell proliferation and induces apoptosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Constitutive activation of the PI3K/Akt/mTOR pathway is common in aggressive mantle cell lymphoma (MCL).
  • This pathway plays a significant role in the pathogenesis of aggressive MCL.
  • Investigating PI3K isoforms is crucial for understanding MCL proliferation.

Purpose of the Study:

  • To investigate the role of specific PI3K isoforms in the proliferation of aggressive MCL cells.
  • To evaluate the effects of PI3K isoform-selective inhibitors on MCL cell viability, cell cycle, and apoptosis.

Main Methods:

  • Treatment of aggressive MCL cells with PI3K isoform-selective inhibitors.
  • Assessment of cell viability, cell cycle distribution, and apoptosis.
  • Western blot analysis to investigate molecular changes, including phosphorylated Akt and downstream targets.

Main Results:

  • Class IA PI3K isoforms are primarily involved in activating Akt in aggressive MCL.
  • A p110α inhibitor caused significant cell cycle arrest and apoptosis by blocking p-Akt.
  • A p110δ inhibitor induced moderate cell cycle arrest and p-Akt downregulation.
  • A dual p110α/p110δ inhibitor (GDC-0941) demonstrated superior growth inhibition.
  • Inhibition of the p110γ isoform had no effect on MCL cells.

Conclusions:

  • Targeting class IA PI3K isoforms, especially p110α, is a potential therapeutic strategy for aggressive MCL.
  • This approach may be effective in treating refractory cases of aggressive MCL.

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