Cyclin degradation for cancer therapy and chemoprevention

Sarah J Freemantle1, Xi Liu, Qing Feng

  • 1Department of Pharmacology and Toxicology, Dartmouth Medical School, Hanover, New Hampshire 03755, USA. sarah.freemantle@dartmouth.edu

Insights

Cancer chemoprevention utilizes pharmacologic agents to inhibit uncontrolled cell division by modulating cell cycle components. Induced cyclin degradation, particularly targeting cyclin D1, shows promise for cancer therapy and prevention.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Cancer is defined by uncontrolled cell division due to mutagenic events.
  • Chemoprevention strategies aim to restore normal growth control using pharmacologic agents.
  • Many chemopreventive compounds inhibit the cell cycle by modulating key components.

Purpose of the Study:

  • To discuss the emergence of induced cyclin degradation as a target for cancer therapy and chemoprevention.
  • To highlight cyclin D1 as a molecular pharmacologic target and biomarker for clinical response.

Main Methods:

  • Review of chemopreventive strategies and their mechanisms of action.
  • Focus on cell cycle inhibition and apoptosis induction.
  • Exploration of pharmacologic targeting of G1 cyclins for proteasomal degradation.

Main Results:

  • Chemopreventive agents can delay cell division, allowing for DNA repair or apoptosis.
  • Pharmacologic engagement of pathways targeting G1 cyclins for degradation is a viable strategy.
  • Cyclin D1 emerges as a key target and potential biomarker in pre-clinical cancer models.

Conclusions:

  • Induced cyclin degradation represents a novel therapeutic and chemopreventive target.
  • Cyclin D1 is a promising molecular target and biological marker for assessing clinical response in cancer treatment.
  • Pre-clinical evidence supports the role of induced cyclin degradation in cancer therapy and chemoprevention.

Related Concept Videos

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...
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...
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.
Positive Regulator Molecules01:45

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 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...
Drugs that Stabilize Microtubules01:15

Drugs that Stabilize Microtubules

Microtubules are dynamic structures that undergo cycles of catastrophe and rescue. The microtubules play a central role in cell division by forming the spindle apparatus for segregating the chromosomes. This makes them ideal targets for regulating dividing cells in tumors and malignant cancer cells. Microtubule stabilizing drugs help stabilize the microtubule formation and promote its polymerization. Paclitaxel was the first microtubule stabilizing agent used as anticancer drug in chemotherapy...