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Related Concept Videos

Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

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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...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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M-Cdk Drives Transition Into Mitosis02:15

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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.
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M cyclin...
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Anaphase Promoting Complex00:50

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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...
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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.
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The targeted cancer therapies, also known as “molecular targeted therapies,” take advantage of the molecular and genetic differences between the cancer cells and the normal cells. It needs a thorough understanding of the cancer cells to develop drugs that can target specific molecular aspects that drive the growth, progression, and spread of cancer cells without affecting the growth and survival of other normal cells in the body.
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CDK8 Inhibition Releases the Muscle Differentiation Block in Fusion-driven Alveolar Rhabdomyosarcoma.

Susu Zhang1,2, Kathleen Engel1,2, Assil Fahs3

  • 1Department of Pediatric Oncology, Dana-Farber Cancer Institute, Division of Hematology/Oncology, Boston Children's Hospital, Boston, MA, USA.

Biorxiv : the Preprint Server for Biology
|August 12, 2025
PubMed
Summary
This summary is machine-generated.

Cyclin-dependent kinase 8 (CDK8) inhibition shows promise for treating alveolar rhabdomyosarcoma (aRMS), a pediatric cancer. Targeting CDK8 halts tumor growth and promotes differentiation, offering a new therapeutic strategy.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Alveolar rhabdomyosarcoma (aRMS) is a pediatric cancer with poor prognosis.
  • Current therapeutic options for aRMS are limited.

Purpose of the Study:

  • To identify novel therapeutic vulnerabilities in aRMS.
  • To investigate the role of CDK8 in aRMS pathogenesis and explore its therapeutic potential.

Main Methods:

  • Complex-based analysis of DepMap functional genomic data.
  • CDK8 knockout and pharmacologic inhibition in vitro and in vivo.
  • Genome-scale CRISPR-Cas9 drug modifier screen.

Main Results:

  • CDK8 was identified as a dependency in aRMS.
  • CDK8 inhibition impaired tumor cell growth and induced myogenic differentiation.
  • Maximal anti-tumor activity required the Mediator kinase module and SAGA complex.
  • SIX4 was identified as a key transcription factor mediating CDK8 inhibitor effects.

Conclusions:

  • CDK8 inhibition represents a promising differentiation-inducing therapeutic strategy for aRMS.
  • Findings suggest a distinct gain-of-function mechanism for CDK8 inhibitors in aRMS treatment.