Abstract
The Bcl-2 family of proteins regulates apoptosis chiefly by controlling mitochondrial membrane permeability. It has previously been shown that the BH4 domain of Bcl-2/Bcl-xL is essential for the prevention of apoptotic mitochondrial changes, including the release of cytochrome c and apoptotic cell death. We have previously reported that BH4 peptide fused to the protein transduction domain of HIV-1 TAT protein (TAT-BH4) significantly inhibits etoposide-induced apoptosis in a cell line. This time, we investigated whether TAT-BH4 peptide was cytoprotective in ex vivo and in vivo rodent models. Intraperitoneal injection of TAT-BH4 peptide greatly inhibited X-ray-induced apoptosis in the small intestine of mice and partially suppressed Fas-induced fulminant hepatitis. In addition, this peptide markedly suppressed heart failure after ischemia–reperfusion injury in isolated rat heart, probably by preventing mitochondrial dysfunction. These findings demonstrate that TAT-BH4 peptide exerts anti-apoptotic activity both in vivo and ex vivo, and imply that it may be a useful therapeutic agent for diseases involving mitochondrial dysfunction and apoptosis.
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Abbreviations
- BH:
-
Bcl-2 homology
- PTD:
-
protein transduction domain
- VDAC:
-
voltage-dependent anion channel
- RCR:
-
respiratory control ratio
- mAST:
-
mitochondrial aspartate aminotransferase
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Acknowledgements
This study was supported in part by a grant for Scientific Research on Priority Areas, a grant for Center of Excellence Research, a grant for Scientific Research from the Ministry of Education, Science, Sports, and Culture of Japan, and by Special Coordination Funds of Promoting Science and Technology from the Science and Technology Agency of Japan.
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Sugioka, R., Shimizu, S., Funatsu, T. et al. BH4-domain peptide from Bcl-xL exerts anti-apoptotic activity in vivo. Oncogene 22, 8432–8440 (2003). https://doi.org/10.1038/sj.onc.1207180
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DOI: https://doi.org/10.1038/sj.onc.1207180
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