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Ink4c is dispensable for tumor suppression in Myc-induced B-cell lymphomagenesis

L M Nilsson1, U B Keller, C Yang

  • 1Department of Biochemistry, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.

Oncogene
|November 14, 2006
PubMed

Insights

The tumor suppressor p18 (Inhibitor of cyclin-dependent kinase 4c) loss did not affect lymphoma onset in Emu-Myc mice. However, it reduced the frequency of Arf loss, a common event in these B-cell lymphomas.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • p18(Ink4c) is a cyclin-dependent kinase inhibitor that suppresses tumor development.
  • Loss of Ink4c predisposes mice to tumors and enhances oncogene effects.
  • The Emu-Myc transgenic mouse model mimics human Burkitt lymphoma.

Purpose of the Study:

  • To investigate the impact of Ink4c loss on B-cell tumor development in the Emu-Myc mouse model.
  • To determine if Ink4c deficiency influences lymphoma onset or progression.
  • To analyze the interplay between Ink4c, Myc, and Arf in B-cell lymphomagenesis.

Main Methods:

  • Utilized Emu-Myc transgenic mice with varying Ink4c allelic status (wild-type, heterozygous, homozygous null).
  • Monitored lymphoma onset and progression in these mouse cohorts.
  • Assessed proliferative and apoptotic responses in precancerous B cells.
  • Quantified the frequency of Arf loss in developed lymphomas.

Main Results:

  • Loss of one or both Ink4c alleles did not alter the onset of lymphoma in Emu-Myc transgenics.
  • Ink4c deficiency did not significantly affect Myc-driven proliferation or apoptosis in early B cells.
  • Ink4c loss significantly decreased the frequency of Arf loss in Emu-Myc lymphomas.

Conclusions:

  • Ink4c is not a critical determinant for lymphoma initiation in the Emu-Myc model.
  • Ink4c modulates Myc-induced transformation by influencing alternative genetic events, specifically reducing Arf loss.
  • This suggests a complex role for Ink4c in tumor suppression beyond direct cell cycle inhibition, potentially by impacting the selection of cooperating genetic alterations.

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