Abstract
The role of the voltage-dependent anion channel (VDAC) in cell death was investigated using the expression of native and mutated murine VDAC1 in U-937 cells and VDAC inhibitors. Glutamate 72 in VDAC1, shown previously to bind dicyclohexylcarbodiimide (DCCD), which inhibits hexokinase isoform I (HK-I) binding to mitochondria, was mutated to glutamine. Binding of HK-I to mitochondria expressing E72Q-mVDAC1, as compared to native VDAC1, was decreased by ∼70% and rendered insensitive to DCCD. HK-I and ruthenium red (RuR) reduced the VDAC1 conductance but not that of E72Q-mVDAC1. Overexpression of native or E72Q-mVDAC1 in U-937 cells induced apoptotic cell death (80%). RuR or overexpression of HK-I prevented this apoptosis in cells expressing native but not E72Q-mVDAC1. Thus, a single amino-acid mutation in VDAC prevented HK-I- or RuR-mediated protection against apoptosis, suggesting the direct VDAC regulation of the mitochondria-mediated apoptotic pathway and that the protective effects of RuR and HK-I rely on their binding to VDAC.
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Abbreviations
- ANT:
-
adenine nucleotide translocase
- G-6-P:
-
glucose-6-phosphate
- Hepes:
-
N-(-hydroxyethyl])piperazine-N′-[2-ethanesulfonic acid]
- HK:
-
hexokinase
- HK-I:
-
hexokinase isoform I
- β-OG:
-
n-octyl-β-D-glucopyranoside
- PLB:
-
planar lipid bilayer
- RuR:
-
ruthenium red
- STS:
-
staurosporine
- VDAC:
-
voltage-dependent anion channel
- mVDAC:
-
murine VDAC
- rVDAC:
-
rat VDAC
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Acknowledgements
This research was supported by a grant from the Israel Science Foundation, administrated by The Israel Academy of Science and Humanities. We gratefully acknowledge the assistance of Dr. Sara Sivan.
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Zaid, H., Abu-Hamad, S., Israelson, A. et al. The voltage-dependent anion channel-1 modulates apoptotic cell death. Cell Death Differ 12, 751–760 (2005). https://doi.org/10.1038/sj.cdd.4401599
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DOI: https://doi.org/10.1038/sj.cdd.4401599
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