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Dinaciclib Interrupts Cell Cycle and Induces Apoptosis in Oral Squamous Cell Carcinoma: Mechanistic Insights and

Muhammet Oner1, Yu-Chiao Cheng1, Shiuan-Woei Soong1,2

  • 1Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan.

International Journal of Molecular Sciences
|March 13, 2025
PubMed

Insights

Dinaciclib effectively inhibits oral squamous cell carcinoma (OSCC) growth by disrupting cell cycle progression and inducing apoptosis. This CDK inhibitor shows promise for treating OSCC and other head and neck cancers.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Therapeutics

Background:

  • Oral squamous cell carcinoma (OSCC) is an aggressive cancer with limited treatment options.
  • Cyclin-dependent kinases (CDKs) and cyclins are key regulators of the cell cycle, often dysregulated in head and neck squamous cell carcinoma (HNSCC).
  • Dinaciclib, a potent CDK inhibitor, has shown antitumor effects but its efficacy in OSCC is underexplored.

Purpose of the Study:

  • To investigate the therapeutic potential of Dinaciclib in OSCC.
  • To determine Dinaciclib's effects on OSCC cell proliferation, cell cycle progression, and apoptosis.
  • To elucidate the molecular mechanisms underlying Dinaciclib's action in OSCC.

Main Methods:

  • Gene set enrichment analyses were performed on HNSCC patient data.
  • OSCC cell lines (Ca9-22, OECM-1, HSC-3) were treated with Dinaciclib.
  • Cell proliferation was assessed using standard assays.
  • Cell cycle progression was analyzed by flow cytometry.
  • Apoptosis was evaluated using Western blot analysis for cleaved caspase-3 and cleaved PARP.

Main Results:

  • Dinaciclib significantly reduced OSCC cell proliferation in a dose-dependent manner.
  • Dinaciclib induced cell cycle arrest at G1/S and G2/M transitions by downregulating key cyclins (A, B, D, E) and CDKs (1, 2).
  • Dinaciclib treatment upregulated apoptotic markers, indicating induction of programmed cell death.

Conclusions:

  • Dinaciclib demonstrates significant therapeutic promise for OSCC by inhibiting cell cycle progression and inducing apoptosis.
  • These findings support the further investigation of Dinaciclib as a monotherapy or combination treatment for OSCC and other HNSCC subtypes.
  • Dinaciclib's ability to target key cell cycle regulators offers a potential new strategy for improving outcomes in head and neck cancers.
Keywords:
Dinaciclibcell cycle arrestcyclin-dependent kinases (CDKs)oral squamous cell carcinoma (OSCC)

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