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Related Concept Videos

Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
The Cell Cycle Control System01:28

The Cell Cycle Control System

The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and function at the cell...
The Cell Cycle Control System02:11

The Cell Cycle Control System

The cell cycle is an organized set of events that leads the cell to divide into two daughter cells, each containing chromosomes identical to the parent cell. It is the cell cycle that leads to the formation of an entire organism from a single-cell zygote. Besides, cell division also functions in the renewal or repair of tissues in adult multicellular eukaryotes. For example, in the bone marrow, the stem cells divide to form new blood cells. Although essential for several functions, cell...
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

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...
Inhibition of CDK Activity02:34

Inhibition of CDK Activity

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...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Related Experiment Video

Updated: May 15, 2026

Analysis of Cell Cycle Position in Mammalian Cells
12:19

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Quantification of cell cycle-arresting proteins.

Oliver Kepp1, Isabelle Martins, Laurie Menger

  • 1INSERM, U848, Villejuif, France.

Methods in Molecular Biology (Clifton, N.J.)
|January 9, 2013
PubMed
Summary

This study introduces a new immunoblotting method to detect and quantify cyclin-dependent kinase inhibitors (CKIs) in cells. This technique aids in understanding cell cycle arrest in cellular senescence.

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Last Updated: May 15, 2026

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Area of Science:

  • Cellular and Molecular Biology
  • Cancer Research
  • Aging Research

Background:

  • Cellular senescence is a stress response preventing proliferation of cells with oncogenic alterations.
  • Senescence involves permanent cell cycle arrest, primarily driven by cyclin-dependent kinase inhibitors (CKIs).
  • Key CKIs include p16INK4A, p21CIP1, and p27KIP1, which inhibit cyclin-dependent kinases (CDKs).

Purpose of the Study:

  • To present a reliable immunoblotting-based method for detecting and quantifying CKIs.
  • To provide guidelines for interpreting CKI detection results in cellular senescence research.
  • To facilitate research into the mechanisms of cell cycle arrest.

Main Methods:

  • Development and validation of an immunoblotting assay.
  • Application of the assay for in vitro and ex vivo sample analysis.
  • Establishment of interpretive criteria for CKI quantification.

Main Results:

  • Successfully established a robust immunoblotting method for CKI detection and quantification.
  • Demonstrated the utility of the method in both in vitro and ex vivo settings.
  • Provided clear guidelines for result interpretation.

Conclusions:

  • The developed immunoblotting method offers a valuable tool for studying cellular senescence.
  • Accurate quantification of CKIs is crucial for understanding cell cycle arrest.
  • This method supports further research into senescence and age-related diseases.