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• W2892025657 abstract "Background and Purpose- tPA (tissue-type plasminogen activator) is the only recommended intravenous thrombolytic agent for ischemic stroke. However, its application is limited because of increased risk of hemorrhagic transformation beyond the time window. T541 is a Chinese compound medicine with potential to attenuate ischemia and reperfusion injury. This study was to explore whether T541-benefited subjects underwent tPA thrombolysis extending the time window. Methods- Male C57BL/6 N mice were subjected to carotid artery thrombosis by stimulation with 10% FeCl3 followed by 10 mg/kg tPA with/without 20 mg/kg T541 intervention at 4.5 hours. Thrombolysis and cerebral blood flow were observed dynamically until 24 hours after drug treatment. Neurological deficit scores, brain edema and hemorrhage, cerebral microvascular junctions and basement membrane proteins, and energy metabolism in cortex were assessed then. An in vitro hypoxia/reoxygenation model using human cerebral microvascular endothelial cells was used to evaluate effect of T541 on tight junctions and F-actin in the presence of tPA. Results- tPA administered at 4.5 hours after carotid thrombosis resulted in a decrease in thrombus area and survival rate, whereas no benefit on cerebral blood flow. Study at 24 hours after tPA administration revealed a significant angioedema and hemorrhage in the ischemia hemisphere, a decreased expression of junction proteins claudin-5, zonula occludens-1, occludin, junctional adhesion molecule-1 and vascular endothelial cadherin, and collagen IV and laminin. Meanwhile, ADP/ATP, AMP/ATP, and ATP5D (ATP synthase subunit) expression and activities of mitochondria complex I, II, and IV declined, whereas malondialdehyde and 8-Oxo-2'-deoxyguanosine increased and F-actin arrangement disordered. All the insults after tPA treatment were attenuated by addition of T541 dose dependently. Conclusions- The results suggest T541 as a potential remedy to attenuate delayed tPA-related angioedema and hemorrhage and extend time window for tPA treatment. The potential of T541 to upregulate energy metabolism and protect blood-brain barrier is likely attributable to its effects observed." @default.
• W2892025657 created "2018-09-27" @default.
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• W2892025657 date "2018-09-01" @default.
• W2892025657 modified "2023-10-12" @default.
• W2892025657 title "Angioedema and Hemorrhage After 4.5-Hour tPA (Tissue-Type Plasminogen Activator) Thrombolysis Ameliorated by T541 via Restoring Brain Microvascular Integrity" @default.
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• W2892025657 doi "https://doi.org/10.1161/strokeaha.118.021754" @default.
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