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Ca2+-Dependent caspase activation by gallic acid derivatives.
K Isuzugawa1, M Inoue, Y Ogihara
1Department of Pharmacognosy, Faculty of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan.
Biological & Pharmaceutical Bulletin
|July 18, 2001
Summary
Gallic acid derivatives (GDs) activate caspase-3, leading to apoptosis in tumor cells. This process involves intracellular calcium elevation, distinct from gallic acid
Area of Science:
- Biochemistry
- Molecular Biology
- Cancer Research
Background:
- Gallic acid (GA) derivatives, GD-1 and GD-3, induce tumor cell apoptosis.
- Understanding the mechanism of GD-induced apoptosis is crucial for cancer therapy.
Purpose of the Study:
- To elucidate the caspase activation mechanism of GD-1 and GD-3.
- To compare the apoptotic signaling pathways of GDs and GA.
Main Methods:
- Treatment of promyelocytic leukemia HL-60RG cells with GD-1, GD-3, and GA.
- Analysis of poly(ADP-ribose)polymerase (PARP) cleavage as a marker of caspase-3 activity.
- Investigation of the roles of reactive oxygen species (ROS), intracellular calcium, and caspase inhibitors.
Main Results:
- GD-1 and GD-3 induced PARP cleavage, indicating caspase-3 activation.
- GD-induced PARP cleavage was dependent on intracellular calcium elevation but independent of ROS.
- GA-induced PARP cleavage was inhibited by ROS scavengers and calcium chelators, suggesting a different pathway.
Conclusions:
- GDs activate caspase-3 through intracellular calcium elevation, independent of ROS.
- The apoptotic signaling pathway of GDs differs from that of GA.
- GDs represent a distinct class of apoptosis-inducing agents with potential therapeutic applications.