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Apoptotic signaling induces hyperpermeability following hemorrhagic shock.

Authors
  • Childs, Ed W
  • Tharakan, Binu
  • Hunter, Felicia A
  • Tinsley, John H
  • Cao, Xiaobo
Type
Published Article
Journal
American journal of physiology. Heart and circulatory physiology
Publication Date
Jun 01, 2007
Volume
292
Issue
6
Identifiers
PMID: 17307990
Source
Medline
License
Unknown

Abstract

Hemorrhagic shock (HS) disrupts the endothelial cell barrier, resulting in microvascular hyperpermeability. Recent studies have also demonstrated that activation of the apoptotic signaling cascade is involved in endothelial dysfunction, which may result in hyperpermeability. Here we report involvement of the mitochondrial "intrinsic" pathway in microvascular hyperpermeability following HS in rats. HS resulted in the activation of the mitochondrial intrinsic pathway, as is evident from an increase in the proapoptotic Bcl-2 family member BAK, release of mitochondrial cytochrome c into the cytoplasm, and activation of caspase-3. This, along with the in vivo transfection of the proapoptotic peptide BAK (BH3), resulted in hyperpermeability (as visualized by intravital microscopy), release of mitochondrial cytochrome c into the cytoplasm, and activation of caspase-3. Conversely, transfection of the BAK (BH3) mutant had no effect on hyperpermeability. Together, these results demonstrate involvement of the mitochondrial intrinsic apoptotic pathway in HS-induced hyperpermeability and that the attenuation of this pathway may provide an alternative strategy in preserving vascular barrier integrity.

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