Related Experiment Video
Updated: Jul 14, 2026
10:03
Quantification of Cytokine-Induced Cell Death in Human Colonic Organoids Using Live Fluorescence Microscopy
Published on: August 2, 2024
Quantitative imaging of apoptosis commitment in colorectal tumor cells
Michael Keese1, Martin Offterdinger, Christian Tischer
1Chirurgische Klinik, Universitätsklinikum Mannheim, Mannheim, Germany.
Differentiation; Research in Biological Diversity
|May 22, 2007
Summary
EGFR kinase inhibitors enhance apoptosis in colorectal cancer cells treated with 5-fluorouracil. This suggests that EGFR signaling pathways promote resistance to programmed cell death, a key factor in tumor cell survival.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Colorectal tumor cells exhibit resistance to apoptosis, a key challenge in cancer therapy.
- Epidermal Growth Factor Receptor (EGFR) signaling is implicated in cell survival and apoptosis resistance.
Purpose of the Study:
- To investigate EGFR-mediated survival signals that confer resistance to apoptosis in human colorectal tumor cells.
- To analyze the role of EGFR kinase activity in apoptosis resistance.
Main Methods:
- Development of a novel Förster Resonance Energy Transfer (FRET)-based caspase-3 substrate sensor using EGFP and tHcred1.
- Quantitative monitoring of caspase-3 activation using fluorescence lifetime imaging microscopy (FLIM) and fluorescence correlation spectroscopy (FCS).
- Treatment of colorectal SW-480 tumor cells with 5-fluorouracil and EGFR kinase inhibitors.
Main Results:
- The developed optical methods allow for quantitative comparison of caspase-3 activation between cells.
- EGFR kinase inhibitors sensitize SW-480 cells to 5-fluorouracil-induced apoptosis.
- EGFR-mediated survival signaling, via its kinase activity, contributes to apoptosis resistance.
Conclusions:
- EGFR kinase activity plays a crucial role in promoting apoptosis resistance in colorectal cancer cells.
- Targeting EGFR signaling may represent a therapeutic strategy to overcome resistance to chemotherapy in colorectal cancer.
