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MSH2 deficiency abolishes the anticancer and pro-aging activity of short telomeres

Paula Martinez1, Irene Siegl-Cachedenier, Juana M Flores

  • 1Spanish National Cancer Centre, Madrid, Spain.

Aging Cell
|November 7, 2008
PubMed

Insights

Mismatch repair (MMR) protein MSH2 signals cell-cycle arrest due to short telomeres. MSH2 deficiency abolishes the tumor suppressor activity of short telomeres, impacting cancer and aging.

Area of Science:

  • Genetics
  • Cancer Biology
  • Molecular Biology

Background:

  • Mutations in the mismatch repair (MMR) pathway are common in human colorectal cancers.
  • Cell-cycle arrest triggered by cellular stresses like telomere shortening acts as an anticancer mechanism.
  • Telomerase-deficient mouse models demonstrate the anticancer role of short telomeres.

Purpose of the Study:

  • To investigate the role of the MMR protein MSH2 in cell-cycle arrest in response to short telomeres.
  • To determine if MSH2 deficiency affects the tumor suppressor activity of short telomeres.
  • To explore the impact of MSH2 on degenerative pathologies and proliferative defects in telomerase-deficient mice.

Main Methods:

  • Utilized MSH2(-/-) Terc(-/-) mice, a telomerase-deficient model.
  • Observed telomere length across successive generations.
  • Assessed cancer suppression, degenerative pathologies, and proliferative defects.

Main Results:

  • MSH2 deficiency abolished the tumor suppressor activity of short telomeres, as cancer was not suppressed in MSH2(-/-) Terc(-/-) mice.
  • MSH2 deficiency prevented gastrointestinal degenerative pathologies and rescued proliferative defects.
  • These effects were independent of changes in telomere length.

Conclusions:

  • MSH2 plays a critical role in the organismal response to dysfunctional telomeres.
  • MSH2's function in telomere maintenance and cell-cycle arrest is crucial for tumor suppression and preventing aging-related pathologies.
  • Understanding MSH2's role may offer insights into human cancers with MMR pathway mutations.

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