Related Experiment Video

Updated: Jun 12, 2026

A Mouse Model to Investigate the Role of Cancer-Associated Fibroblasts in Tumor Growth
06:35

A Mouse Model to Investigate the Role of Cancer-Associated Fibroblasts in Tumor Growth

Published on: December 22, 2020

Molecular bridging of aging and cancer: A CARF link

Caroline T Cheung1, Sunil C Kaul, Renu Wadhwa

  • 1National Institute of Advanced Industrial Science & Technology, Ibaraki, Japan.

Annals of the New York Academy of Sciences
|June 12, 2010
PubMed

Insights

Collaborator of ARF (CARF) protein enhances tumor suppression and cell growth control. CARF is crucial for cell survival and may link aging and cancer by regulating p53 and pRB pathways.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Oncology

Background:

  • Collaborator of ARF (CARF) is a protein interacting with ARF and p53.
  • CARF plays a role in cell growth control and tumor suppression.
  • CARF is regulated by MDM2-mediated degradation, indicating a self-regulatory mechanism.

Purpose of the Study:

  • To investigate the role of CARF in cellular processes.
  • To understand CARF's regulation of p53 and pRB pathways.
  • To explore CARF's potential link between aging and cancer.

Main Methods:

  • Yeast two-hybrid screens to identify ARF interacting proteins.
  • Overexpression and knockdown studies in human fibroblasts.
  • Analysis of cell cycle, senescence, and apoptosis markers.
  • Western blotting to assess protein levels and pathway activation.

Main Results:

  • CARF enhances both ARF-dependent and -independent p53 functions.
  • CARF expression is upregulated during senescence.
  • CARF overexpression induces premature senescence via p53-p21 and p16-pRB pathways.
  • CARF knockdown leads to mitotic arrest, chromosomal abnormalities, and apoptosis.
  • CARF bidirectionally regulates p53 and pRB pathways, affecting cell growth.

Conclusions:

  • CARF is essential for cell survival and proper cell cycle progression.
  • CARF acts as a critical regulator of tumor suppressor pathways.
  • CARF's bidirectional regulation of growth pathways suggests a role in the aging-cancer continuum.

More Related Videos

A Mimic of the Tumor Microenvironment: A Simple Method for Generating Enriched Cell Populations and Investigating Intercellular Communication09:52

A Mimic of the Tumor Microenvironment: A Simple Method for Generating Enriched Cell Populations and Investigating Intercellular Communication

Published on: September 20, 2016

Evaluating the Effect of SASP Factors on the Proliferation of Cancer Cells Using a Comparative Analysis of Three Distinct Methodologies08:57

Evaluating the Effect of SASP Factors on the Proliferation of Cancer Cells Using a Comparative Analysis of Three Distinct Methodologies

Published on: September 19, 2025

Related Concept Videos

Aging01:26

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
Adaptive Mechanisms in Cancer Cells02:53

Adaptive Mechanisms in Cancer Cells

Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
Some of the advantages that cancer cells have on normal cells include - enhanced ability to divide without terminally differentiating, induce new blood vessel formation,...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
The mTOR pathway or the...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...