期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 350, 期 1, 页码 233-237出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2006.09.036
关键词
brain injury; free radical; intracerebral hemorrhage; iron; oxidative; stroke; subarachnoid hemorrhage
资金
- NINDS NIH HHS [R01 NS050662, R01 NS042273, NS050662, NS042273] Funding Source: Medline
The heme oxygenase (HO) enzymes catalyze the rate-limiting step of heme breakdown. Prior studies have demonstrated that the vulnerability of neurons and astrocytes to hemoglobin is modified in cells lacking HO-2, the constitutive isoform. The present study assessed the effect of the inducible isoform, HO-1. Wild-type astrocytes treated for 3-5 days with 3-30 mu M hemoglobin sustained no loss of viability, as quantified by LDH and MTT assays. The same treatment resulted in death of 25-50% of HO-1 knockout astrocytes, and a 4-fold increase in protein oxidation. Cell injury was attenuated by transfer of the HO-1 gene, but not by bilirubin, the antioxidant heme breakdown product. Conversely, neuronal protein oxidation and cell death after hemoglobin exposure were similar in wild-type and HO-1 knockout cultures. These results suggest that HO-1 induction protects astrocytes from the oxidative toxicity of Hb, but has no effect on neuronal injury. (c) 2006 Elsevier Inc. All rights reserved.
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