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Neuroprotective effect of apolipoprotein E against ischemia
Kazuo Kitagawa1, Masayasu Matsumoto, Masatsugu Hori
1Division of Strokology, Department of Internal Medicine and Therapeutics, Osaka University Graduate School of Medicine (A8), 2-2 Yamadaoka, Suita-city, Osaka 565-0871, Japan. kitagawa@medone.med.osaka-u.ac.jp
Annals of the New York Academy of Sciences
|December 14, 2002
Summary
Apolipoprotein E (APOE) deficiency worsens brain injury by increasing cell death from oxidative stress. Vitamin E pretreatment protected against this neuronal damage, suggesting APOE’s antioxidant role in neuroprotection.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Apolipoprotein E (APOE) deficiency exacerbates neuronal injury following cerebral ischemia.
- The precise molecular mechanisms behind APOE's neuroprotective effects, particularly concerning excitotoxicity, free radicals, and apoptosis, are not fully understood.
Purpose of the Study:
- To investigate the role of APOE in neuronal vulnerability to specific cellular stressors.
- To elucidate the neuroprotective mechanisms of APOE against cerebral ischemia.
Main Methods:
- Cultured neurons from APOE-knockout and wild-type mice were exposed to glutamate, hydrogen peroxide, and staurosporine.
- Adult mice underwent transient forebrain ischemia, with some pretreated with vitamin E.
- Neuronal death was assessed in both in vitro and in vivo models.
Main Results:
- APOE deficiency did not alter neuronal vulnerability to glutamate or staurosporine (apoptosis inducer).
- APOE-deficient neurons showed significantly increased cell death upon exposure to hydrogen peroxide (oxidative stress).
- APOE-deficient mice exhibited greater neuronal death after ischemia, which was reduced by vitamin E pretreatment.
Conclusions:
- APOE exerts neuroprotection against cerebral ischemia primarily through its antioxidant properties.
- APOE's protective effect is not mediated by mitigating glutamate excitotoxicity or blocking apoptosis.
- Targeting APOE's antioxidant function may offer therapeutic strategies for ischemic brain injury.