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Apoptotic effects of psiRNA-STAT3 on 4T1 breast cancer cells in vitro

Yue Zhou1, Lin Tian, Ying-Chao Zhang

  • 1School of Pharmacy, 2Department of Breast Surgery , The Second Clinical Hospital, 3Department of Plastic Surgery, the China- Japan Union Hospital, 4Department of Biology and Medical Engineering, Institute of Regenerative Medicine, Jilin University, Changchun, China E-mail : gbf_cc@sohu.com, zhouqw@jlu.edu.cn.

Asian Pacific Journal of Cancer Prevention : APJCP
|August 30, 2014
PubMed
Abstract

Insights

This study shows that transfecting psiRNA-STAT3 plasmid using Lipofectamine2000 (Life2000) inhibits 4T1 breast cancer cell proliferation and promotes apoptosis. The process involves regulating caspase-3 and cyclin-D1 protein expression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Investigating novel therapeutic strategies for breast cancer.
  • Focusing on the role of STAT3 signaling in 4T1 breast cancer cells.

Purpose of the Study:

  • To evaluate the efficacy of psiRNA-STAT3 plasmid delivered by Lipofectamine2000 (Life2000) in inhibiting 4T1 breast cancer cell growth.
  • To elucidate the molecular mechanisms underlying the anti-cancer effects.

Main Methods:

  • Cell proliferation assessed by MTT assay.
  • Cell cycle analysis using flow cytometry.
  • Apoptosis and mitochondrial membrane potential observed via fluorescence microscopy.
  • Protein expression of caspase-3 and cyclin-D1 determined by immunohistochemical staining.

Main Results:

  • Transfection of psiRNA-STAT3 significantly inhibited 4T1 cell proliferation by 8 hours.
  • Observed typical apoptotic morphological features and decreased mitochondrial membrane potential.
  • Increased G0/G1 phase cells and decreased S phase cells, indicating cell cycle arrest (p<0.05).
  • Significant upregulation of caspase-3 and downregulation of cyclin-D1 protein expression.

Conclusions:

  • Lipofectamine2000-mediated delivery of psiRNA-STAT3 plasmid effectively inhibits 4T1 breast cancer cell proliferation.
  • The plasmid promotes apoptosis in 4T1 cells through the regulation of caspase-3 and cyclin-D1 protein expression.

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