Regulation of Mn-superoxide dismutase activity and neuroprotection by STAT3 in mice after cerebral ischemia.
- Authors
- Jung, Joo Eun; Kim, Gab Seok; Narasimhan, Purnima; Song, Yun Seon; Chan, Pak H.
- Issue Date
- May-2009
- Publisher
- SOC NEUROSCIENCE
- Citation
- JOURNAL OF NEUROSCIENCE, v.29, no.21, pp 7003 - 7014
- Pages
- 12
- Journal Title
- JOURNAL OF NEUROSCIENCE
- Volume
- 29
- Number
- 21
- Start Page
- 7003
- End Page
- 7014
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/13783
- DOI
- 10.1523/JNEUROSCI.1110-09.2009
- ISSN
- 0270-6474
1529-2401
- Abstract
- Cerebral ischemia and reperfusion increase superoxide anions (O 2.-) in brain mitochondria. Manganese superoxide dismutase (Mn-SOD; SOD2), a primary mitochondrial antioxidant enzyme, scavenges superoxide radicals and its overexpression provides neuroprotection. However, the regulatory mechanism of Mn-SOD expression during cerebral ischemia and reperfusion is still unclear. In this study, we identified the signal transducer and activator of transcription 3 (STAT3) as a transcription factor of the mouse Mn-SOD gene, and elucidated the mechanism of O2.- overproduction after transient focal cerebral ischemia (tFCI). We found that Mn-SOD expression is significantly reduced by reperfusion in the cerebral ischemic brain. We also found that activated STAT3 is usually recruited into the mouse Mn-SOD promoter and upregulates transcription of the mouse Mn-SOD gene in the normal brain. However, at early postreperfusion periods after tFCI, STAT3 was rapidly downregulated, and its recruitment into the Mn-SOD promoter was completely blocked. In addition, transcriptional activity of the mouse Mn-SOD gene was significantly reduced by STAT3 inhibition in primary cortical neurons. Moreover, we found that STAT3 deactivated by reperfusion induces accumulation of O2.- in mitochondria. The loss of STAT3 activity induced neuronal cell death by reducing Mn-SOD expression. Using SOD2-/+ heterozygous knock-out mice, we found that Mn-SOD is a direct target of STAT3 in reperfusion-induced neuronal cell death. Our study demonstrates that STAT3 is a novel transcription factor of the mouse Mn-SOD gene and plays a crucial role as a neuroprotectant in regulating levels of reactive oxygen species in the mouse brain. Copyright © 2009 Society for Neuroscience.
- Files in This Item
-
Go to Link
- Appears in
Collections - 약학대학 > 약학부 > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.