BAX contributes to apoptotic-like death following neonatal hypoxia-ischemia: Evidence for distinct apoptosis pathways

Margaret E. Gibson, Hee Han Byung, Junjeong Choi, C. Michael Knudson, Stanley J. Korsmeyer, Maia Parsadanian, David M. Holtzman

Research output: Contribution to journalArticle

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Abstract

Background: Hypoxic-ischemic (H-I) injury to the neonatal brain has been shown to result in rapid cell death with features of acute excitotoxicity/necrosis as well as prominent delayed cell death with features of apoptosis such as marked caspase-3 activation. BAX, a pro-apoptotic molecule, has been shown to be required for apoptotic neuronal cell death during normal development but the contribution of endogenous BAX in cell death pathways following H-I injury to the developing or adult brain has not been studied. Materials and Methods: Bax +/+, +/-, and -/- mice at post-natal day 7 were subjected to unilateral carotid ligation followed by exposure to 45 minutes of 8% oxygen. At different timepoints following H-I, brain tissue was studied by conventional histology, immunohistochemistry, immunofluorescence, Western blotting, and enzymatic assay to determine the extent and type of cell injury as well as the amount of caspase activation. Results: We found that bax -/- mice had significantly less (38%) hippocampal tissue loss than mice expressing bax. Some of the remaining cell death in bax -/- mice, however, still had features of apoptosis including evidence of nuclear shrinkage and caspase-3 activation. Though bax -/- mice had significantly decreased caspase-3 activation as compared to bax expressing mice following H-I, the density of cells with activated caspase-8 in the CA3 region of the hippocampus did not differ between bax +/- and bax -/- mice. Conclusions: These findings demonstrate that endogenous BAX plays a role in regulating cell death in the central nervous system (CNS) following neonatal H-I, a model of cerebral palsy. In addition, while BAX appears to modulate the caspase-3 activation following neonatal H-I, caspase-8 which is linked to death receptor activation, may contribute to apoptotic-like neuronal death in a BAX-independent manner.

Original languageEnglish
Pages (from-to)644-655
Number of pages12
JournalMolecular Medicine
Volume7
Issue number9
Publication statusPublished - 2001 Dec 1

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Ischemia
Apoptosis
Cell Death
Caspase 3
Caspase 8
Wounds and Injuries
Brain
Death Domain Receptors
Enzyme Assays
Cerebral Palsy
Caspases
Perinatal Death
Hypoxia
Fluorescent Antibody Technique
Ligation
Hippocampus
Histology
Necrosis
Central Nervous System
Cell Count

All Science Journal Classification (ASJC) codes

  • Molecular Medicine
  • Molecular Biology
  • Genetics
  • Genetics(clinical)

Cite this

Gibson, M. E., Byung, H. H., Choi, J., Knudson, C. M., Korsmeyer, S. J., Parsadanian, M., & Holtzman, D. M. (2001). BAX contributes to apoptotic-like death following neonatal hypoxia-ischemia: Evidence for distinct apoptosis pathways. Molecular Medicine, 7(9), 644-655.
Gibson, Margaret E. ; Byung, Hee Han ; Choi, Junjeong ; Knudson, C. Michael ; Korsmeyer, Stanley J. ; Parsadanian, Maia ; Holtzman, David M. / BAX contributes to apoptotic-like death following neonatal hypoxia-ischemia : Evidence for distinct apoptosis pathways. In: Molecular Medicine. 2001 ; Vol. 7, No. 9. pp. 644-655.
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abstract = "Background: Hypoxic-ischemic (H-I) injury to the neonatal brain has been shown to result in rapid cell death with features of acute excitotoxicity/necrosis as well as prominent delayed cell death with features of apoptosis such as marked caspase-3 activation. BAX, a pro-apoptotic molecule, has been shown to be required for apoptotic neuronal cell death during normal development but the contribution of endogenous BAX in cell death pathways following H-I injury to the developing or adult brain has not been studied. Materials and Methods: Bax +/+, +/-, and -/- mice at post-natal day 7 were subjected to unilateral carotid ligation followed by exposure to 45 minutes of 8{\%} oxygen. At different timepoints following H-I, brain tissue was studied by conventional histology, immunohistochemistry, immunofluorescence, Western blotting, and enzymatic assay to determine the extent and type of cell injury as well as the amount of caspase activation. Results: We found that bax -/- mice had significantly less (38{\%}) hippocampal tissue loss than mice expressing bax. Some of the remaining cell death in bax -/- mice, however, still had features of apoptosis including evidence of nuclear shrinkage and caspase-3 activation. Though bax -/- mice had significantly decreased caspase-3 activation as compared to bax expressing mice following H-I, the density of cells with activated caspase-8 in the CA3 region of the hippocampus did not differ between bax +/- and bax -/- mice. Conclusions: These findings demonstrate that endogenous BAX plays a role in regulating cell death in the central nervous system (CNS) following neonatal H-I, a model of cerebral palsy. In addition, while BAX appears to modulate the caspase-3 activation following neonatal H-I, caspase-8 which is linked to death receptor activation, may contribute to apoptotic-like neuronal death in a BAX-independent manner.",
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Gibson, ME, Byung, HH, Choi, J, Knudson, CM, Korsmeyer, SJ, Parsadanian, M & Holtzman, DM 2001, 'BAX contributes to apoptotic-like death following neonatal hypoxia-ischemia: Evidence for distinct apoptosis pathways', Molecular Medicine, vol. 7, no. 9, pp. 644-655.

BAX contributes to apoptotic-like death following neonatal hypoxia-ischemia : Evidence for distinct apoptosis pathways. / Gibson, Margaret E.; Byung, Hee Han; Choi, Junjeong; Knudson, C. Michael; Korsmeyer, Stanley J.; Parsadanian, Maia; Holtzman, David M.

In: Molecular Medicine, Vol. 7, No. 9, 01.12.2001, p. 644-655.

Research output: Contribution to journalArticle

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T1 - BAX contributes to apoptotic-like death following neonatal hypoxia-ischemia

T2 - Evidence for distinct apoptosis pathways

AU - Gibson, Margaret E.

AU - Byung, Hee Han

AU - Choi, Junjeong

AU - Knudson, C. Michael

AU - Korsmeyer, Stanley J.

AU - Parsadanian, Maia

AU - Holtzman, David M.

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N2 - Background: Hypoxic-ischemic (H-I) injury to the neonatal brain has been shown to result in rapid cell death with features of acute excitotoxicity/necrosis as well as prominent delayed cell death with features of apoptosis such as marked caspase-3 activation. BAX, a pro-apoptotic molecule, has been shown to be required for apoptotic neuronal cell death during normal development but the contribution of endogenous BAX in cell death pathways following H-I injury to the developing or adult brain has not been studied. Materials and Methods: Bax +/+, +/-, and -/- mice at post-natal day 7 were subjected to unilateral carotid ligation followed by exposure to 45 minutes of 8% oxygen. At different timepoints following H-I, brain tissue was studied by conventional histology, immunohistochemistry, immunofluorescence, Western blotting, and enzymatic assay to determine the extent and type of cell injury as well as the amount of caspase activation. Results: We found that bax -/- mice had significantly less (38%) hippocampal tissue loss than mice expressing bax. Some of the remaining cell death in bax -/- mice, however, still had features of apoptosis including evidence of nuclear shrinkage and caspase-3 activation. Though bax -/- mice had significantly decreased caspase-3 activation as compared to bax expressing mice following H-I, the density of cells with activated caspase-8 in the CA3 region of the hippocampus did not differ between bax +/- and bax -/- mice. Conclusions: These findings demonstrate that endogenous BAX plays a role in regulating cell death in the central nervous system (CNS) following neonatal H-I, a model of cerebral palsy. In addition, while BAX appears to modulate the caspase-3 activation following neonatal H-I, caspase-8 which is linked to death receptor activation, may contribute to apoptotic-like neuronal death in a BAX-independent manner.

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Gibson ME, Byung HH, Choi J, Knudson CM, Korsmeyer SJ, Parsadanian M et al. BAX contributes to apoptotic-like death following neonatal hypoxia-ischemia: Evidence for distinct apoptosis pathways. Molecular Medicine. 2001 Dec 1;7(9):644-655.