Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Selective Suppression of a Subset of Bax-dependent Neuronal Death by a Cell Permeable Peptide Inhibitor of Bax, BIP

  • Kim, Soo-Young (Department of Anatomy, College of Medicine, Brain Korea 21, Korea University) ;
  • Kim, Hyun (Department of Anatomy, College of Medicine, Brain Korea 21, Korea University) ;
  • Sun, Woong (Department of Anatomy, College of Medicine, Brain Korea 21, Korea University)
  • Published : 2008.12.31
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Abstract

Bax, a pro-apoptotic member of Bcl-2 family proteins, plays a central role in the mitochondria-dependent apoptosis. Apoptotic signals induce the translocation of Bax from cytosol into the mitochondria, which triggers the release of apoptogenic molecules such as cytochrome C and apoptosis-inducing factor, AIF. Bax-inhibiting peptide(BIP) is a cell permeable peptide comprised of five amino acids designed from the Bax-interaction domain of Ku70. Because BIP inhibits Bax translocation and Bax-mediated release of cytochrome C, BIP suppresses Bax-dependent apoptosis. In this study, we observed that BIP inhibited staurosporine-induced neuronal death in cultured cerebral cortex and cerebellar granule cells, but BIP failed to rescue granule cells from trophic signal deprivation-induced neuronal death, although both staurosporine-induced and trophic signal deprivation-induced neuronal death are dependent on Bax. These findings suggest that the mechanisms of the Bax activation may differ depending on the type of cell death induction, and thus BIP exhibits selective suppression of a subtype of Bax-dependent neuronal death.

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References

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