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O(2/3) exposure inhibits cell progression affecting cyclin B1/cdk1 activity in SK-N-SH while induces apoptosis in

A Cannizzaro1, C Verga Verga Falzacappa, M Martinelli

  • 1AFAR-Centro Ricerca S. Pietro, Fatebenefratelli Hospital, Roma, Italy.

Journal of Cellular Physiology
|May 5, 2007
PubMed

Insights

Oxygen therapy (O(2/3)) shows promise as an anti-tumoral treatment for neuroblastoma. This study found O(2/3) inhibits neuroblastoma cell growth and induces cell cycle arrest or apoptosis, suggesting potential as a novel therapeutic strategy.

Area of Science:

  • Oncology
  • Cell Biology
  • Biochemistry

Background:

  • Neuroblastoma is a significant pediatric cancer, necessitating novel therapeutic approaches.
  • Oxygen therapy, particularly hyperoxia, presents an alternative anti-tumoral strategy due to its unique physiochemical properties.
  • The efficacy of O(2/3) gas mixture as a treatment for neuroblastoma warrants investigation.

Purpose of the Study:

  • To analyze the inhibitory effect of O(2/3) treatment on human neuroblastoma cell lines (SK-N-SH and SK-N-DZ).
  • To investigate the mechanisms of O(2/3)-induced cell growth inhibition, including cell cycle perturbation and apoptosis.
  • To evaluate the potential of combining O(2/3) treatment with conventional chemotherapeutic agents.

Main Methods:

  • Treatment of SK-N-SH and SK-N-DZ neuroblastoma cell lines with O(2/3) gas mixture.
  • Analysis of cell growth inhibition, cell cycle progression (G2 arrest), and apoptosis markers (caspase 3, PARP cleavage, Bax).
  • Assessment of cyclin B1/cdk1 complex activity, Wee1, and chk1 protein levels.
  • Evaluation of combined O(2/3) and chemotherapy (Cisplatin, Etoposide, Gemcitabine) effects.

Main Results:

  • O(2/3) treatment inhibited cell growth and induced cell cycle perturbation in both neuroblastoma cell lines.
  • In SK-N-SH cells, O(2/3) caused G2 arrest with altered cyclin B1/cdk1 complex activity and increased Wee1/chk1 levels.
  • In SK-N-DZ cells, O(2/3) induced apoptosis via caspase 3 activation and PARP cleavage, with increased Bax.
  • Combined O(2/3) and chemotherapy showed enhanced inhibition in SK-N-SH cells but not significantly in SK-N-DZ cells.

Conclusions:

  • O(2/3) treatment effectively inhibits neuroblastoma cell growth through distinct mechanisms (cell cycle arrest or apoptosis) in different cell lines.
  • O(2/3) demonstrates potential as a standalone or combination therapy for neuroblastoma.
  • Further research is warranted to optimize O(2/3) therapy for neuroblastoma treatment.

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