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Asphyxial hypoxic preconditioning induces neuroprotective effect via activation of toll-like receptor 4 (TLR4) signal pathway in rats

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机构: [a]Department of Anesthesiology, The Second Artillery General Hospital, Beijing 100088, China [b]Department of Gynaecology and Obstetrics, The Second Artillery General Hospital, Beijing 100088, China [c]Department of Anesthesiology, Beijing Sanbo Brain Hospital, Capital Medical University, No. 50, Xiang Shan Yi-ke-song, Haidian District, Beijing 100093, China [d]Department of Anesthesiology, Beijing Tiantan Hospital, Capital Medical University, Beijing 100050, China [e]Basic Medical Sciences Academy of Military Medical Sciences of Chinese PLA, Beijing 100071, China
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关键词: Asphyxial cardiac arrest Cerebral ischemic tolerance Hypoxic preconditioning Toll-like receptor 4

摘要:
Hypoxic preconditioning (HP) induces neuroprotective effect against cerebral ischemia, but the mechanism still remains unclear. In this study, we investigated whether the toll-like receptor 4 (TLR4) signal pathway was involved in cerebral ischemic tolerance. According to the treatment of HP and asphyxial cardiac arrest (ACA), rats were assigned to ACA group, HP + ACA group, HP group and Sham group. Rat mortality was 5% in HP + ACA group and 30% in ACA group (P<0.01); neurofunctional scores in HP and HP + ACA group were better than in ACA group (P<0.05). Compared with Sham group, TLR4 mRNA expression, NF-k{cyrillic}B activity and the production of TNF-α and IL-6 in HP or HP + ACA or ACA group were significantly increased. The increase was progressively significant in groups (AHP < AHP + ACA < ACA) (P<0.01). HP induced mild inflammation via activating the TLR4 signal pathway and then further inhibited inflammatory response induced by ACA. © 2011 Academic Journals.

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大类 | 4 区 综合性期刊
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