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Achacin induces cell death in HeLa cells through two different mechanisms
Nobuyuki Kanzawa1, Satoko Shintani, Kazumasa Ohta
1Department of Chemistry, Faculty of Science and Technology, Sophia University, 102-8554 Tokyo, Japan. n-kanza@sophia.ac.jp
Archives of Biochemistry and Biophysics
|January 17, 2004
Summary
Achacin causes cell death through direct hydrogen peroxide production and a secondary caspase-mediated apoptosis pathway, triggered by L-amino acid depletion. This study reveals dual mechanisms of achacin-induced cytotoxicity.
Area of Science:
- Biochemistry
- Cell Biology
- Toxicology
Background:
- Achacin, an L-amino acid oxidase, generates hydrogen peroxide (H2O2) in cell cultures.
- Incubation with achacin or H2O2 induces similar cell death morphology.
Purpose of the Study:
- To elucidate the mechanisms underlying achacin-induced cytotoxicity.
- To investigate the roles of H2O2 production and apoptosis in achacin's effects.
Main Methods:
- Cell cultures were treated with achacin, H2O2, and catalase.
- Apoptosis was assessed through morphological changes, DNA fragmentation, and PARP cleavage.
- Caspase activity was inhibited using Z-VAD-fmk.
Main Results:
- Achacin induces cell death via H2O2 generation.
- In the presence of catalase, achacin triggers apoptosis, characterized by DNA fragmentation and PARP cleavage.
- Apoptosis induced by achacin is caspase-dependent and linked to L-amino acid depletion.
Conclusions:
- Achacin-induced cell death involves two distinct pathways: direct H2O2 production and a caspase-mediated apoptotic pathway.
- L-amino acid depletion by achacin initiates the apoptotic cascade, highlighting a novel cytotoxic mechanism.