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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...

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.

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...

Anaphase Promoting Complex

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...

MAPK Signaling Cascades

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...

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Related Experiment Video

Updated: Dec 3, 2025

Genetic Manipulation of Cerebellar Granule Neurons In Vitro and In Vivo to Study Neuronal Morphology and Migration

Genetic Manipulation of Cerebellar Granule Neurons In Vitro and In Vivo to Study Neuronal Morphology and Migration

Published on: March 17, 2014

p39-associated Cdk5 activity regulates dendritic morphogenesis.

Li Ouyang^1,2, Yu Chen^1,2,3,4, Ye Wang^1,2

¹Division of Life Science, State Key Laboratory of Molecular Neuroscience and Molecular Neuroscience Center, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China.

Scientific Reports

|October 31, 2020

Summary

The study identifies p39 as a key regulator of dendritic development in neurons. Its absence impairs dendrite growth, and the protein WDFY1 acts downstream to control this crucial process.

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Rapid Detection of Neurodevelopmental Phenotypes in Human Neural Precursor Cells NPCs

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Published on: March 2, 2018

Area of Science:

Neuroscience
Molecular Biology
Cell Biology

Background:

Dendritic structure is vital for neuronal function and information processing.
Dysregulation of dendritic morphogenesis contributes to neurological disorders.
Cyclin-dependent kinase 5 (Cdk5) is crucial for dendritic development, but its activators and downstream pathways are not fully understood.

Purpose of the Study:

To investigate the role of p39, a neuronal Cdk5 activator, in regulating dendritic morphogenesis.
To identify downstream molecular targets of Cdk5/p39 signaling in dendritic development.

Main Methods:

Analysis of dendritic morphology in p39-deficient neurons.
RNA sequencing to identify downstream genes.
WDFY1 knockdown experiments.
Phosphoproteomic analysis.

Main Results:

Neurons lacking p39 show reduced dendritic length and arborization, similar to Cdk5-deficient neurons.
WDFY1 (WD repeat and FYVE domain-containing 1) was identified as a downstream effector of Cdk5/p39.
Suppression of WDFY1 expression rescued the dendritic arborization defects in p39-deficient neurons.
Cdk5/p39 signaling modulates pathways including PI3K/Akt, cAMP, and small GTPases.

Conclusions:

p39 is a critical regulator of dendritic morphogenesis, acting via WDFY1.
Cdk5/p39 signaling impacts cytoskeletal organization, protein synthesis, and trafficking.
Understanding these pathways offers insights into neurological disorder pathogenesis.