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Arsenic trioxide induces apoptosis in pancreatic cancer cells via changes in cell cycle, caspase activation, and GADD

Xinquan Li1, Xianzhong Ding, Thomas E Adrian

  • 1Department of Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.

Pancreas
|July 29, 2003
PubMed

Insights

Arsenic trioxide effectively triggers apoptosis in human pancreatic cancer cells by activating caspases and the mitochondrial pathway. This mechanism also involves cell cycle arrest and GADD gene expression, suggesting its potential for pancreatic cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Pancreatic cancer remains a significant health challenge with limited effective treatments.
  • Arsenic trioxide has shown promise in inhibiting cancer cell proliferation and inducing apoptosis.
  • Understanding the precise mechanisms of arsenic trioxide's action in pancreatic cancer is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the molecular mechanisms by which arsenic trioxide induces apoptosis in human pancreatic cancer cells.
  • To elucidate the role of the caspase cascade, mitochondrial pathway, and cell cycle regulation in arsenic trioxide-mediated apoptosis.
  • To explore the potential of arsenic trioxide as a therapeutic agent for pancreatic cancer.

Main Methods:

  • Utilized MiaPaCa2 and PANC-1 human pancreatic cancer cell lines.
  • Assessed apoptosis through caspase activation (caspase-3, -7, -9), poly ADP ribose polymerase (PARP) cleavage, and Bcl-2 family protein expression analysis.
  • Analyzed cell cycle distribution using flow cytometry and examined the expression of cell cycle regulatory proteins (p21, cyclins, CDKs) and GADD genes (GADD45, GADD153).

Main Results:

  • Arsenic trioxide activated caspase-3, -7, and -9, leading to PARP cleavage, indicating caspase cascade activation.
  • Downregulation of anti-apoptotic proteins (Bcl-2, Mcl-1) and upregulation of pro-apoptotic Bax protein were observed.
  • Arsenic trioxide induced cell cycle arrest at G0/G1 and G2/M phases, increased the sub-G0/G1 apoptotic population, and modulated the expression of p21, cyclins, and GADD genes.

Conclusions:

  • Arsenic trioxide induces apoptosis in pancreatic cancer cells via the mitochondrial pathway and caspase activation.
  • The drug modulates cell cycle progression and enhances GADD gene expression.
  • These findings highlight arsenic trioxide's potential as a valuable therapeutic option for pancreatic cancer.

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