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Living Beyond Restriction: LBR promotes cellular immortalization by suppressing genomic instability and senescence

Haebeen Choi1,2, Chanhee Kang1,2

  • 1School of Biological Sciences, Seoul National University, South Korea.

The FEBS Journal
|April 22, 2024
PubMed

Insights

Cellular immortalization, a hallmark of cancer, involves overcoming senescence. Researchers found that lamin B receptor (LBR) promotes cell proliferation and immortalization by maintaining genome integrity in deficient cells.

Area of Science:

  • Cellular and Molecular Biology
  • Cancer Research
  • Aging Research

Background:

  • Cellular immortalization is a complex process crucial for cancer development, requiring multiple genetic alterations to overcome barriers like senescence.
  • Key tumor suppressor pathways, including the cellular tumor antigen p53 and p16-Retinoblastoma (RB) pathways, are frequently mutated in cancer but are insufficient alone for full immortalization.
  • Understanding the molecular mechanisms underlying immortalization is vital for developing novel cancer therapies and exploring cell rejuvenation strategies.

Purpose of the Study:

  • To investigate the role of the lamin B receptor (LBR) in cellular immortalization, particularly in cells deficient in p53 and RB pathways.
  • To determine if LBR can promote cellular proliferation and overcome senescence-associated barriers.
  • To explore the potential therapeutic applications of modulating LBR in cancer treatment and cell rejuvenation.

Main Methods:

  • Utilized cell culture models with deficiencies in p53 and RB tumor suppressor pathways.
  • Assessed the impact of lamin B receptor (LBR) expression on cellular proliferation rates.
  • Evaluated LBR's role in maintaining genome integrity and suppressing senescence.
  • Investigated the potential of LBR modulation for therapeutic intervention.

Main Results:

  • Lamin B receptor (LBR) was identified as a key factor promoting cellular proliferation and immortalization in p53- and RB-deficient cells.
  • LBR contributes to maintaining genome integrity, a critical process for preventing cellular senescence.
  • Suppression of senescence was observed in cells where LBR played a role.
  • The findings suggest LBR is essential for overcoming senescence and achieving full immortalization.

Conclusions:

  • Lamin B receptor (LBR) plays a significant role in cellular immortalization by preserving genome integrity and inhibiting senescence, especially in the context of p53 and RB pathway deficiencies.
  • Modulation of LBR presents a potential therapeutic strategy for treating cancers characterized by p53 and RB mutations.
  • Targeting LBR may also offer possibilities for promoting cell rejuvenation, opening avenues for regenerative medicine.
Keywords:
cancercellular immortalizationcellular senescencegenomic instabilitylamin B receptor

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