【摘要】 本研究旨在探讨一种新合成的和厚朴酚衍生小分子化合物HH-A在缺氧和永久性大脑中动脉闭塞条件下的抗缺氧以及减轻缺血缺氧所致脑损伤作用。利用大鼠低氧(11%氧含量)模型,给予HH-A 1 mg/kg (i.v.)和40 mg/kg (i.g.)以及和厚朴酚0.55 mg/kg,采用血气分析动脉血氧饱和度。利用大鼠永久性脑缺血模型,给予HH-A 0.25和1 mg/kg (i.v.),进行神经行为学评估,手术7天后取脑组织进行脑梗死体积测量。使用表面等离子共振技术进行HH-A靶蛋白钓取;利用缺氧探针评估脑组织缺氧程度;采用NeuN免疫荧光染色和H&E染色评估脑组织缺血缺氧损伤程度;分子对接试验分析预测HH-A与候选靶蛋白血红蛋白之间结合位点。结果显示,HH-A显著增加低氧状态下的血氧饱和度,并且显著减少脑组织的缺氧程度;在大鼠永久性脑缺血模型中,1 mg/kgHH-A显著减少神经行为评分,显著降低脑组织梗死体积,缓解脑组织的损伤;分子钓靶试验获得9个候选靶蛋白,分子对接试验进一步验证HH-A与血红蛋白之间具有很高的亲和力。研究表明, HH-A可能通过血红蛋白发挥抗缺氧作用,并且可以提高缺氧耐受性,减轻脑缺血缺氧损伤。更多还原

【Abstract】 Exposure to hypoxic conditions can result in significant brain damage, such as that experienced during an ischemic stroke. Thus, finding ways to mitigate ischemia/hypoxia-induced brain tissue damage is a critical issue that needs addressing. HH-A, a derivative of honokiol, has demonstrated potent pharmacological activities and medicinal properties in treating brain ischemia/reperfusion injury. However, its effect on anti-hypoxic responses during stroke remains largely unexplored. In the present study, we subjected male Sprague-Dawley rats to 24 h of hypoxia(oxygen content at 11%) or to 7 d of permanent middle cerebral artery occlusion. We discovered that both 1 mg/kg(i.v.) and 40 mg/kg(i.g.) of HH-A elevated arterial oxygen saturation after 24 h of hypoxia and significantly reduced the infarct volume after 7 d of ischemia. Furthermore, fluorescence staining with hypoxyprobe-1 indicated that HH-A significantly mitigated the severity of hypoxia in brain tissue. Hematoxylin and eosin staining, along with neuronal nuclei immunofluorescent staining, further revealed that HH-A curbed the death of brain cells. To identify potential protein partners of HH-A, we used a molecular fishing approach based on surface plasmon resonance technology. A high binding affinity was detected between HH-A and the hemoglobin subunit beta, with an estimated binding free energy of –8.7 kcal/mol. These findings suggested that HH-A was capable of enhancing hypoxia tolerance and alleviating brain injury caused by ischemia.更多还原