Abstract |
To elucidate the mechanism of induction of apoptosis by geranylgeraniol (GGO), which is a potent inducer of apoptosis in various lines of human cancer cells, we examined the role of intracellular acidification during GGO-induced apoptosis using human leukemia HL60 cells. Flow cytometry analysis revealed that apoptosis induced in human leukemia HL60 cells by GGO was associated with intracellular acidification. Both GGO-induced intracellular acidification and apoptosis as analyzed by DNA fragmentation were inhibited by phorbol myristate acetate (TPA) and O'-bis(2-aminophenyl)ethyleneglycol-N,N,N',N-tetraacetic acid tetraacetoxymethyl ester ( BAPTA-AM), an intracellular Ca(2+) chelator, but not by ethyleneglycol-bis(2-aminoethylether)-N,N,N',N'-tetraacetic acid ( EGTA). These results suggest that the early concentration change of intracellular Ca(2+) and the corresponding decrease in intracellular pH are required for the induction of apoptosis in HL60 cells by GGO.
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Authors | Yutaka Masuda, Toshihiro Aiuchi, Saori Mihara, Shigeo Nakajo, Kazuyasu Nakaya |
Journal | Biological & pharmaceutical bulletin
(Biol Pharm Bull)
Vol. 30
Issue 5
Pg. 880-4
(May 2007)
ISSN: 0918-6158 [Print] Japan |
PMID | 17473429
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Diterpenes
- 1,2-bis(2-aminophenoxy)ethane N,N,N',N'-tetraacetic acid acetoxymethyl ester
- Egtazic Acid
- Cytochromes c
- geranylgeraniol
- Tetradecanoylphorbol Acetate
- Calcium
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Topics |
- Apoptosis
(drug effects)
- Calcium
(metabolism)
- Cytochromes c
(metabolism)
- DNA Fragmentation
(drug effects)
- Diterpenes
(pharmacology)
- Egtazic Acid
(analogs & derivatives, pharmacology)
- HL-60 Cells
- Humans
- Hydrogen-Ion Concentration
- Mitochondria
(metabolism)
- Tetradecanoylphorbol Acetate
(pharmacology)
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