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Oridonin induces human epidermoid carcinoma A431 cell apoptosis through tyrosine kinase and mitochondrial pathway

Dan Li1, Li-Jun Wu, Shin-Ichi Tashiro

  • 1China-Japan Research Institute of Medical and Pharmaceutical Sciences, Shenyang Pharmaceutical University, Shenyang, China.

Journal of Asian Natural Products Research
|December 7, 2007
PubMed

Insights

Oridonin induces cancer cell death by triggering apoptosis through the mitochondrial pathway and inhibiting tyrosine kinase activity. This natural compound activates caspase-3 and reduces epidermal growth factor receptor expression in A431 cells.

Area of Science:

  • Pharmacology
  • Molecular Biology
  • Cancer Research

Background:

  • Oridonin, a natural diterpenoid from Rabdosia rubescens, exhibits anti-cancer properties.
  • Human epidermoid carcinoma A431 cells overexpress the epidermal growth factor receptor (EGFR).

Purpose of the Study:

  • To elucidate the mechanism of oridonin-induced apoptosis in A431 cells.
  • To investigate the role of the tyrosine kinase pathway in oridonin's cytotoxic effects.

Main Methods:

  • Morphological observation
  • Lactate dehydrogenase activity assay
  • DNA agarose gel electrophoresis
  • Western blot analysis
  • Mitochondrial transmembrane potential measurement

Main Results:

  • Oridonin treatment activated caspase-3, leading to ICAD and PARP degradation.
  • Oridonin induced cytochrome c release and decreased mitochondrial transmembrane potential (ΔΨm).
  • The Bax/Bcl-2 ratio increased, and tyrosine kinase activity, including EGFR expression, was reduced.

Conclusions:

  • Oridonin induces apoptosis in A431 cells via the mitochondrial pathway.
  • Oridonin inhibits tyrosine kinase activity, contributing to its anti-cancer effects.

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