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Paclitaxel induces apoptosis of esophageal squamous cell carcinoma cells by downregulating STAT3 phosphorylation at

Xiaolong Zhang1, Xiaoyi Wu2, Fangling Zhang3

  • 1Department of Anesthesia and Critical Care, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang 325027, P.R. China.

Oncology Reports
|March 29, 2017
PubMed

Insights

Paclitaxel triggers cancer cell death by impacting mitochondrial function and reducing STAT3 signaling. This study clarifies paclitaxel

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Paclitaxel is a known inducer of apoptosis in various cancer types.
  • The precise mechanisms by which paclitaxel induces apoptosis in human esophageal squamous cell carcinoma (ESCC) are not fully elucidated.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying paclitaxel-induced apoptosis in human ESCC cells.
  • To explore the role of Signal Transducer and Activator of Transcription 3 (STAT3) signaling in paclitaxel's apoptotic effects on ESCC.

Main Methods:

  • Treatment of ESCC cell lines (EC-1 and Eca-109) with paclitaxel.
  • Assessment of apoptosis-related protein expression and cytochrome c release.
  • Measurement of mitochondrial membrane potential and reactive oxygen species (ROS) production.
  • Analysis of mitochondrial respiration and STAT3/phospho-STAT3 levels.

Main Results:

  • Paclitaxel treatment upregulated apoptosis-related proteins and increased cytochrome c release.
  • Downregulation of Signal Transducer and Activator of Transcription 3 (STAT3) and phospho-STAT3 (Ser727) was observed.
  • Paclitaxel induced mitochondrial membrane potential depolarization and increased ROS generation.
  • Inhibition of mitochondrial respiration was noted following paclitaxel treatment.

Conclusions:

  • Paclitaxel induces apoptosis in ESCC cells (EC-1 and Eca-109) by downregulating STAT3 and phospho-STAT3 (Ser727).
  • The findings highlight paclitaxel's role in inducing mitochondrial apoptosis in ESCC.
  • Paclitaxel demonstrates therapeutic potential for ESCC treatment via mitochondrial apoptotic pathways.

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