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研究生(外文):Zi-An Peng
論文名稱(外文):The neuroprotective mechanism of puerarin in a transient focal ischemia/reperfusion rat model
外文關鍵詞:ischemic strokepuerarinMCAOneuroprotection
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Puerarin(4’,7-dihydroxy-8-β-glucosylisoflavone)為中藥葛根(Pueraria lobata)的主要活性成份。根據近年來的研究文獻指出;puerarin具有擴張冠狀動脈、降低體溫以及增加腦部血流的功能,且puerarin亦曾被證實能夠改善動物因心血管以及腦血管病變的微循環。
實驗結果顯示,puerarin (50 mg/kg)能夠有意義地減少因缺血再灌流傷害所引起之梗塞面積。從分子生物層面測試puerarin對神經傷害的保護機轉,經由西方墨點法發現,投與puerarin能夠減少iNOS和HIF-1α 蛋白質表現及減少caspase-3的活化;經由反轉錄-聚合酵素連鎖反應方法分析發現,puerarin能夠減少TNF-α發炎因子以及c-fos mRNA的表現,並能改善Bcl-2的down regulation。除此之外,puerarin在體外實驗中也發現有抑制嗜中性白血球活性的效果。
根據上述這些發現,証實puerarin具有保護神經的能力以減少腦部缺血再灌流的傷害。我們推測此效果的機轉應為透過抑制iNOS、HIF-1α、TNF-α等發炎因子的表現而減少其傷害,抑制嗜中性白血球活化而降低發炎反應的進行。另一方面,puerarin亦能抑制caspase-3以及c-fos的表現、減少Bcl-2 downr egulation進而避免神經細胞的凋亡,然而更詳盡的神經保護機轉仍待進一步的研究
Stroke is still the 2nd leading causes of mortality and morbidity worldwide, it’s also a major factor to make the Taiwanese death and disability.
Although our knowledge concerning the molecular and cellular pathophysiology of brain injury after focal ischemia has advanced greatly, the development of new drugs for acute ischemic stroke has not progressed as rapidly. One strategy for treating acute stroke patients is the development of neuroprotective drugs.
Unfortunately, the clinical trial of using various preclinically neuroprotective drugs for stroke has fail. The middle cerebral artery is the vessel mostly affected by cerebral occlusion in ischemic stroke, thus the middle cerebral artery occlusion (MCAO) of rodents provides an excellent model that is relevant to ischemic stroke in human.
Puerarin(4’,7-dihydroxy-8-β-glucosylisoflavone)is a major active compound extracted from the root of Pueraria lobat, a traditional Chinese medicine. It has been shown to improve microcirculation of cardial and cerebral diseases. In this study, we evaluated the protective effects of puerarin in cerebral ischemia-reperfusion animal injury model.
We found that puerarin (50 mg/kg, ip) markedly attenuated the infarct volume at 24 hours after MCA occlusion/reperfusion. Puerarin pretreatment can significantly reduce protein expression of iNOS and HIF-1α, and inhibit caspase-3 activation in the experiment of Western blotting. Using reverse transcription-polymerase chain reaction analysis,puerarin suppressed the expression of TNF-α mRNA and c-fos, and also decreased Bcl-2 downregulation in the damage cerebral cortex area. On the other hand, we also found that puerarin could inhibit fMLP-induced neutrophils activation in vitro. However, our studies revealled that puerarin has no activities in antioxidantion and free radical scavenging.
In conclusion, we demonstrated that puerarin had neuroprotective effects against cerebral ischemia/reperfusion injury in rats, may involve in : (1) reduction of iNOS and HIF-1α protein expression, (2) suppression of TNF-α and c-fos mRNA expression, (3) prevention of Bcl-2 down regulation, (4) inhibition of caspase-3 activation in vivo and (5) attenuation of fMLP induced-neutrophil activation in vitro. However, the more detailed neuroprotective mechanisms of puerarin will be further investigated in the future.
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