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Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death
09:18

Identification of Intracellular Signaling Events Induced in Viable Cells by Interaction with Neighboring Cells Undergoing Apoptotic Cell Death

Published on: December 27, 2016

A novel apoptotic pathway as defined by lectin cellular initiation

Brian Gastman1, Kent Wang, Jie Han

  • 1Division of Plastic Surgery, University of Pittsburgh School of Medicine and University of Pittsburgh Cancer Institute, Pittsburgh, PA 15213, USA.

Biochemical and Biophysical Research Communications
|March 9, 2004
PubMed

Insights

Wheat germ agglutinin (WGA) induces rapid apoptosis in tumor cells within 30 minutes. This programmed cell death is unique, bypassing Fas and caspase-3 pathways, and is driven by mitochondria independently of Bcl-2, Bax, and Bak.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Immunology

Background:

  • Apoptosis, or programmed cell death, is crucial for normal development and disease prevention.
  • Lectin-induced apoptosis offers a potential therapeutic strategy against cancer.
  • Understanding the molecular mechanisms of apoptosis induction is key to developing targeted therapies.

Purpose of the Study:

  • To investigate the mechanism of apoptosis induced by wheat germ agglutinin (WGA).
  • To determine the cell surface molecules and signaling pathways involved in WGA-mediated apoptosis.
  • To explore the potential of WGA as an inducer of rapid apoptosis in cancer cells.

Main Methods:

  • Incubation of tumor cells with WGA and analysis of apoptosis markers.
  • Carbohydrate specificity studies of WGA binding to cell surface receptors.
  • Gene transfection experiments (CrmA, Bcl-2) and analysis of apoptosis resistance.
  • Assessment of mitochondrial pathway activation (transmembrane potential, cytochrome c release, caspase-9 activation).
  • Studies using Fas-resistant and Bax/Bak-deficient cell lines.

Main Results:

  • WGA rapidly induced apoptosis in tumor cells within 30 minutes.
  • WGA induced apoptosis by binding to N-acetylneuraminic acid or N-acetylglucosamine on cell surfaces.
  • WGA-induced apoptosis was independent of Fas, caspase-3, and Bcl-2 expression.
  • Apoptosis was mediated via the mitochondrial pathway, involving loss of transmembrane potential, cytochrome c release, and caspase-9 activation.
  • WGA-induced apoptosis was effective even in cells lacking Bax and Bak.

Conclusions:

  • WGA triggers a unique, extremely rapid form of apoptosis.
  • The WGA-induced apoptotic pathway is Fas- and caspase-3-independent.
  • Mitochondrial pathway activation is central to WGA-induced apoptosis.
  • This pathway is not regulated by Bcl-2, Bax, or Bak, suggesting a novel mechanism of apoptosis induction.

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