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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
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Updated: May 20, 2025

Techniques to Induce and Quantify Cellular Senescence
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RIG-I-driven CDKN1A stabilization reinforces cellular senescence.

Cui Wang1,2,3, Xiaoyu Jiang4,3, Hong-Yu Li5,3

  • 1China National Center for Bioinformation, Beijing, 100101, China.

Science China. Life Sciences
|March 26, 2025
PubMed
Summary
This summary is machine-generated.

Retinoic acid-inducible gene-I (RIG-I) accumulation drives cellular senescence by stabilizing CDKN1A mRNA. Inhibiting RIG-I in stem cells prevents aging, suggesting new therapeutic targets for age-related diseases.

Keywords:
RIG-Iaginghuman stem cellinnate immune pathwaysenescence

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Area of Science:

  • Immunology
  • Cellular Biology
  • Aging Research

Background:

  • The innate immune system is vital for pathogen defense but its role in aging is unclear.
  • Retinoic acid-inducible gene-I (RIG-I) is a key antiviral immune mediator with an unknown function in stem cell senescence.

Purpose of the Study:

  • To investigate the role of RIG-I in cellular senescence.
  • To elucidate the molecular mechanisms by which RIG-I influences aging.

Main Methods:

  • Analysis of RIG-I levels in cellular aging models.
  • CRISPR/Cas9-mediated RIG-I deletion and pharmacological inhibition in human mesenchymal stem cells (hMSCs).
  • RNA immunoprecipitation (RIP) to identify RIG-I mRNA targets.

Main Results:

  • RIG-I levels increase during cellular aging and drive senescence.
  • RIG-I deletion or inhibition in hMSCs confers resistance to senescence.
  • RIG-I binds to and stabilizes CDKN1A mRNA, leading to increased p21Cip1 expression and senescence.

Conclusions:

  • RIG-I acts as a post-transcriptional regulator of cellular senescence.
  • RIG-I accumulation is a driver of aging.
  • Targeting RIG-I may offer a strategy for mitigating age-related diseases.