Related Experiment Video
Updated: Jun 20, 2026
12:02
Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols
Published on: June 6, 2017
Cdk2 inhibition prolongs G1 phase progression in mouse embryonic stem cells
Zuzana Koledova1, Leona Raskova Kafkova, Lenka Calabkova
1Department of Biology, Faculty of Medicine, Palacky University, Olomouc, Czech Republic.
Stem Cells and Development
|September 10, 2009
Summary
High Cdk2 activity is essential for rapid cell-cycle progression in mouse embryonic stem cells (mESCs). Down-regulating Cdk2 activity with olomoucine II halts mESC proliferation and induces differentiation.
Area of Science:
- Stem Cell Biology
- Cell Cycle Regulation
- Molecular Biology
Background:
- Embryonic stem cells (ESCs) exhibit rapid proliferation and a distinct cell cycle with a short G1 phase.
- Previous research indicated high Cdk2 activity is crucial for human ESC cell-cycle regulation and cell fate.
- The role of Cdk2 in mouse ESC (mESC) cell-cycle progression remained unclear.
Purpose of the Study:
- To investigate the role of Cdk2 in mESC cell-cycle progression.
- To determine the effects of Cdk2 activity down-regulation on mESC proliferation and pluripotency.
Main Methods:
- Utilized olomoucine II to inhibit Cdk2 activity in two mESC lines.
- Employed nocodazole synchronization to analyze cell-cycle phase progression.
- Assessed DNA replication and expression of differentiation markers.
Main Results:
- Olomoucine II treatment significantly increased G1 phase cells and decreased S phase cells, inhibiting DNA replication.
- Specific Cdk2 inhibition prolonged G1 phase and established a somatic cell-like cell cycle.
- Down-regulation of Cdk2 activity induced differentiation markers in mESCs.
Conclusions:
- High Cdk2 activity is vital for the rapid G1 phase and unique cell-cycle structure of mESCs.
- A link exists between cell-cycle regulation and pluripotency maintenance in ESCs.
- Olomoucine II is an effective tool for manipulating ESC cell cycle and pluripotency, with potential applications for other stem cell types, including cancer stem cells.
Related Concept Videos
02:34Inhibition 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...
02:34Inhibition 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...
02:15M-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...
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...
02:15M-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...
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...
02:39Positive 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.
01:23Negative 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.