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Inhibition of Cdk Activity

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...

M-Cdk Drives Transition Into Mitosis

M-Cdk Drives Transition Into Mitosis

Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...

Positive Regulator Molecules

Positive Regulator Molecules

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.

Positive Regulator Molecules

Positive Regulator Molecules

To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.

Mitogens and the Cell Cycle

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...

S-Cdk Initiates DNA Replication

S-Cdk Initiates DNA Replication

The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...

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Related Experiment Video

Updated: Jan 10, 2026

Initiating Differentiation in Immortalized Multipotent Otic Progenitor Cells

Initiating Differentiation in Immortalized Multipotent Otic Progenitor Cells

Published on: January 2, 2016

Inactivation of CDK4/6, CDK2, and ERK in G1-phase triggers differentiation commitment.

Sanjeev Sharma¹, Henri Berger¹, Tobias Meyer^1,2

¹Department of Biochemistry & Biophysics, Weill Cornell Medicine/Cornell University, New York, NY, USA.

Communications Biology

|November 22, 2025

Summary

Terminal cell differentiation requires coordinated CDK and ERK pathway inactivation. This study reveals that cell cycle exit and differentiation commitment depend on the precise timing of these molecular events.

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Area of Science:

Cell Biology
Molecular Biology
Developmental Biology

Background:

Terminal cell differentiation is crucial for tissue development and regeneration.
The molecular mechanisms underlying permanent cell cycle exit remain incompletely understood.

Purpose of the Study:

To elucidate the molecular events governing terminal cell differentiation and cell cycle exit.
To identify the key signaling pathways and their temporal regulation during differentiation commitment.

Main Methods:

Live-cell imaging of adipogenesis as a model system.
Analysis of cell cycle regulators (CDK4/6, CDK2, cyclins, p27, p21, p18) and ERK pathway activity.
Investigating the role of CDK and ERK inactivation in differentiation commitment.

Main Results:

Initial cell divisions are driven by CDK4/6 or CDK2 activation.
Delayed inactivation of CDK4/6 and CDK2, alongside cyclin D1 decrease and p27 increase, lengthens G1 phase and induces PPARG.
ERK inactivation is essential, in addition to CDK inactivation, for irreversible cell cycle exit and differentiation commitment.

Conclusions:

Coordinated activation and delayed inactivation of CDK4/6, CDK2, and ERK are critical for terminal cell differentiation.
Differentiation commitment is a multi-step process involving precise temporal regulation of cell cycle regulators and signaling pathways.
This study provides novel molecular insights into the regulation of cell cycle exit and differentiation.