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rBTI induces apoptosis in human solid tumor cell lines by loss in mitochondrial transmembrane potential and caspase

Yu-Ying Li1, Zheng Zhang, Zhuan-Hua Wang

  • 1Key Laboratory for Chemical Biology and Molecular Engineering of Ministry of Education, Institute of Biotechnology, Shanxi University, 36 Wucheng Road, Taiyuan, 030006, China.

Toxicology Letters
|June 2, 2009
PubMed

Insights

Recombinant buckwheat trypsin inhibitor (rBTI) effectively inhibits solid tumor cell growth and induces apoptosis. This occurs via the mitochondrial pathway, involving key proteins and caspase activation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Solid tumors represent a significant global health challenge.
  • Targeted therapies inducing apoptosis are crucial for cancer treatment.
  • Understanding novel apoptosis inducers like recombinant buckwheat trypsin inhibitor (rBTI) is essential.

Purpose of the Study:

  • To investigate the molecular mechanisms and effects of rBTI on human solid tumor cell apoptosis.
  • To determine if rBTI can induce programmed cell death in cancer cells.
  • To elucidate the specific apoptotic pathway activated by rBTI.

Main Methods:

  • MTT assay for cell growth inhibition.
  • Flow cytometry for apoptosis analysis.
  • DNA electrophoresis for apoptosis detection.
  • Mitochondrial pathway analysis (Bax, Bak, Bcl-2, Bcl-xl, cytochrome c, caspase-3, -9, Deltapsi(m)).

Main Results:

  • rBTI specifically inhibited solid tumor cell growth dose- and time-dependently.
  • rBTI treatment increased apoptosis in tumor cells (EC9706, HepG2, HeLa).
  • Apoptosis involved mitochondrial pathway activation: Bax/Bak up-regulation, Bcl-2/Bcl-xl down-regulation, cytochrome c release, caspase-3/-9 activation, and mitochondrial potential disruption.
  • Caspase-3 inhibition partially blocked rBTI-induced apoptosis.

Conclusions:

  • rBTI induces apoptosis in human solid tumor cells.
  • The mechanism involves the mitochondrial apoptotic pathway.
  • rBTI shows potential as a therapeutic agent for solid tumors.

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