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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...

Negative Regulator Molecules

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.

Molecular Factors Affecting Cell Division

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...

Positive Regulator Molecules

Positive Regulator Molecules

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

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.

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...

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Related Experiment Video

Updated: Apr 15, 2026

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

Published on: June 6, 2017

MK3 modulation affects BMI1-dependent and independent cell cycle check-points.

Peggy Prickaerts¹, Hanneke E C Niessen¹, Vivian E H Dahlmans¹

¹Department of Molecular Genetics, Maastricht University Medical Centre, Maastricht, the Netherlands.

|April 9, 2015

Summary

MK3 gene influences cell proliferation and senescence. Its overexpression or depletion causes cell cycle arrest, while its loss promotes cancer cell growth, highlighting context-dependent roles.

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Area of Science:

Cell Biology
Molecular Oncology
Epigenetics

Background:

The role of the MK3 gene in cancer (oncogenesis) is unclear, despite its varied expression in different cancers.
Previous research established MK3's control over ERK activity through negative feedback.
This study investigates MK3's function in cell proliferation and its connection to cancer development.

Purpose of the Study:

To elucidate the role of MK3 in regulating cell proliferation and senescence.
To explore the interaction between MK3, Polycomb Repressive Complex 1 (PRC1), and epigenetic modifications.
To understand how MK3 alterations affect cancer cell proliferation.

Main Methods:

Overexpression and depletion of MK3 in human fibroblasts.
Analysis of replication stress and senescence markers.
Assessment of EZH2, H3K27me3, and PRC1/BMI1 binding at the CDKN2A/INK4A locus.
Evaluation of MK3's effect on cancer cell proliferation and M/SAPK signaling.

Main Results:

MK3 overexpression induces proliferative arrest and senescence markers in fibroblasts.
MK3 depletion also leads to senescence characteristics in fibroblasts.
MK3 overexpression reduces EZH2, H3K27me3, and PRC1 binding, while BMI1 partially bypasses MK3-induced senescence.
MK3 loss enhances proliferation in cancer cell lines.
MK3 mutations' effects on proliferation and signaling are cell-context dependent.

Conclusions:

MK3 plays a role in controlling cell proliferation and lifespan, partly via BMI1.
The impact of MK3 modulation on proliferation is dependent on the cellular context.
Findings suggest MK3's complex role in oncogenesis warrants further investigation.