Related Experiment Video

Updated: Jul 16, 2026

Whole Retinal Explants from Chicken Embryos for Electroporation and Chemical Reagent Treatments
09:40

Whole Retinal Explants from Chicken Embryos for Electroporation and Chemical Reagent Treatments

Published on: September 30, 2015

Differential effects of cyclin-dependent kinase blockers upon cell death in the developing retina

Stevens K Rehen1, Mariana Cid, Lucianne Fragel-Madeira

  • 1Instituto de Biofisica da UFRJ, Centro de Ciencias da Saude, Bloco G, Cidade Universitaria, 21949-900, Rio de Janeiro, Brazil.

Brain Research
|July 30, 2002
PubMed

Insights

Cyclin-dependent kinase inhibitors affect retinal cell death. Olomoucine protected retinal ganglion cells (RGCs) from axotomy-induced degeneration, while other inhibitors caused cell death in the neuroblastic layer.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Pharmacology

Background:

  • Cyclin-dependent kinases (CDKs) regulate cell cycle progression.
  • Pharmacological CDK inhibitors like olomoucine (OLO), deferoxamine (DFO), and mimosine (MIMO) have distinct cell cycle arrest profiles.
  • Understanding CDK roles in retinal cell death is crucial for neuroprotection strategies.

Purpose of the Study:

  • To investigate the impact of CDK inhibitors on cell death in neonatal rat retinal explants.
  • To determine if CDK inhibition affects axotomy-induced retinal ganglion cell (RGC) degeneration.
  • To assess the differential effects of OLO, DFO, and MIMO on proliferating and post-mitotic retinal cells.

Main Methods:

  • Culturing histotypical retinal explants from neonatal rats.
  • Administering CDK inhibitors OLO, DFO, and MIMO at specific concentrations.
  • Assessing cell death using markers like bromodeoxyuridine incorporation and proliferating cell nuclear antigen (PCNA) immunolabeling.
  • Evaluating RGC survival after axotomy and cell death in the neuroblastic layer (NBL).

Main Results:

  • Olomoucine (100 microM) inhibited axotomy-induced RGC degeneration.
  • DFO (up to 2 mM) and MIMO (up to 1 mM) did not protect RGCs from axotomy-induced degeneration.
  • All tested CDK inhibitors induced cell death in the NBL after 1 day in vitro.
  • DFO and MIMO selectively killed proliferating cells in the NBL.
  • OLO induced cell death in both proliferating and non-differentiated post-mitotic cells in the NBL.

Conclusions:

  • CDKs play a role in regulating retinal cell susceptibility to death.
  • Retinal cells exhibit differentiation-dependent responses to CDK activity modulation.
  • OLO shows potential for protecting RGCs, while DFO and MIMO may target proliferating cells in the retina.

More Related Videos

Organotypic Retinal Explant Cultures from Macaque Monkey10:32

Organotypic Retinal Explant Cultures from Macaque Monkey

Published on: August 24, 2022

Comprehensive Analysis of Drug Response using the FLICK Assay09:42

Comprehensive Analysis of Drug Response using the FLICK Assay

Published on: June 6, 2025

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.
Positive Regulator Molecules02:39

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.
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...
M-Cdk Drives Transition Into Mitosis02:15

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...
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...
Molecular Factors Affecting Cell Division01:27

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...