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Research Frontline
科研前线
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问题论文
标题:Peroxynitrite activates NLRP3 inflammasome and contributes to hemorrhagic transformation and poor outcome in ischemic stroke with hyperglycemia
期刊:Free Radical Biology and Medicine
单位:香港中文大学中医药学院&香港大学-深圳研究院
发表时间:2021年2月4日
DOI: 10.1016/j.freeradbiomed.2021.01.030
研究摘要:
This study aims to test the hypothesis that peroxynitrite-mediated inflammasome activation could be a crucial player in the blood-brain barrier (BBB) disruption, hemorrhagic transformation (HT) and poor outcome in ischemic stroke with hyperglycemia. We used an experimental rat stroke model subjected to 90 min of middle cerebral artery occlusion plus 24 h or 7 days of reperfusion with or without acute hyperglycemia. We detected the production of peroxynitrite, the expression of NADPH oxidase, iNOS, MMPs and NLRP3 inflammasome in the ischemic brains, and evaluated infarct volume, brain edema, HT, neurological deficit score and survival rates. Our results show that: (1) Hyperglycemia increased the expression of NADPH oxidase subunits p47phox and p67phox, and iNOS, and the production of peroxynitrite. (2) Hyperglycemia increased infarct volume, aggravated the BBB hyperpermeability, induced brain edema and HT, and worsened neurological outcomes. These brain damages and poor outcome were reversed by the treatments of FeTmPyP (a representative peroxynitrite decomposition catalyst, PDC), peroxynitrite scavenger uric acid, and iNOS inhibitor 1400W. Furthermore, the activations of MMPs and NLRP3 inflammasome including pro/active-caspase-1 and IL-1β were inhibited both PDC and 1400W, indicating the roles of peroxynitrite in the inductions of MMPs and NLRP3 inflammasome in the ischemic brains under hyperglycemia. (3) NLRP3 inflammasome inhibitor MCC950, caspase-1 inhibitor VX-765 and IL-1β inhibitor diacerein attenuated brain edema, minimized hemorrhagic transformation and improved neurological outcome, demonstrating the roles of NLRP3 inflammasome in the hyperglycemia-mediated HT and poor outcome in the ischemic stroke rats with acute hyperglycemia. In conclusion, peroxynitrite could mediate activations of MMPs and NLRP3 inflammasome, aggravate the BBB damage and HT, and induce poor outcome in ischemic stroke with hyperglycemia. Therefore, targeting peroxynitrite–mediated NLRP3 inflammasome could be a promising strategy for ischemic stroke with hyperglycemia.02
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具体说明
#1 René Aquarius comment accepted April 2025
评论通过,2025 年 4 月
Dear authors, 尊敬的作者们,
We found unexpected overlap between two of your figures. We also found that the same brain sections produced different results in two of your figures.
我们发现您两幅图中存在意外的重叠。同时,我们还发现同一脑区在您两幅图中产生了不同的结果。
All findings are indicated in the enclosed image below.
所有发现均已在下附图像中指明。
参考信息
https://www.sciencedirect.com/science/article/abs/pii/S0891584921000472?via%3Dihub
https://pubpeer.com/publications/0E6294D33B013D0D004B0ADA67F5AE#0
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