Kai Xin San is a Chinese herbal formula composed of Radix Ginseng, Poria, Radix Polygalae and Acorus Tatarinowii Rhizome. It has been used in China for many years for treating amnesia. Kai Xin San ameliorates amyloid-...Kai Xin San is a Chinese herbal formula composed of Radix Ginseng, Poria, Radix Polygalae and Acorus Tatarinowii Rhizome. It has been used in China for many years for treating amnesia. Kai Xin San ameliorates amyloid-β （Aβ） induced cognitive dysfunction and is neuroprotective in vivo, but its precise mechanism remains unclear. Expression of insulin-degrading enzyme （IDE）, which degrades Aβ, is strongly correlated with cognitive function. Here, we injected rats with exogenous Aβ42 （200 μM, 5 μL） into the hippocampus and subsequently administered Kai Xin San （0.54 or 1.08 g/kg/d） intragastrically for 21 consecutive days. Hematoxylin eosin and Nissl staining revealed that Kai Xin San protected neurons against Aβ-induced damage. Furthermore, enzyme linked immunosorbent assay, western blot and polymerase chain reaction results showed that Kai Xin San decreased Aβ42 protein levels and increased expression of IDE protein, but not mRNA, in the hippocampus. Our findings reveal that Kai Xin San facilitates hippocampal Aβ degradation and increases IDE expression, which leads, at least in part, to the alleviation of hippocampal neuron injury in rats.展开更多
目的了解氯喹对大鼠肝脏胰岛素降解酶(insulin-degrading enzyme,IDE)基因表达(expression of IDE gene,EIG)及酶蛋白表达(expression of IDE protein,EIP)水平的影响.方法以高脂肪饮食喂养法复制的胰岛素抵抗(insulin resistance,IR)Wi...目的了解氯喹对大鼠肝脏胰岛素降解酶(insulin-degrading enzyme,IDE)基因表达(expression of IDE gene,EIG)及酶蛋白表达(expression of IDE protein,EIP)水平的影响.方法以高脂肪饮食喂养法复制的胰岛素抵抗(insulin resistance,IR)Wistar大鼠模型为对象,检测IR大鼠肝脏EIG,EIP水平和肝脏IDE活性,并测定大鼠的平均葡萄糖输注率(glucose infusion rate,GIR60-120),同时观察氯喹对上述指标的影响.结果IR大鼠的EIG,EIP水平显著高于常规饲料喂养的对照大鼠.服用氯喹后,IR大鼠EIG,EIP水平显著降低,对照大鼠的上述指标无明显改变.IR大鼠和对照大鼠的肝脏IDE活性均与EIG,EIP水平呈显著正相关,而与GIR60-120呈显著负相关.结论氯喹降低IR大鼠IDE活性可能是通过抑制IDE基因转录,从而降低IDE酶蛋白表达量来实现.展开更多
基金supported by the National Natural Science Foundation of China,No.81303248,81603321the Natural Science Foundation of Heilongjiang Province of China,No.H2015028+1 种基金a grant from the Nursing Program for Young Scholars of Heilongjiang Province of China,No.UNPYSCT-2016116the Scientific Research Fund for Doctors of Qiqihar Medical University in China,No.QY2016B-09
文摘Kai Xin San is a Chinese herbal formula composed of Radix Ginseng, Poria, Radix Polygalae and Acorus Tatarinowii Rhizome. It has been used in China for many years for treating amnesia. Kai Xin San ameliorates amyloid-β （Aβ） induced cognitive dysfunction and is neuroprotective in vivo, but its precise mechanism remains unclear. Expression of insulin-degrading enzyme （IDE）, which degrades Aβ, is strongly correlated with cognitive function. Here, we injected rats with exogenous Aβ42 （200 μM, 5 μL） into the hippocampus and subsequently administered Kai Xin San （0.54 or 1.08 g/kg/d） intragastrically for 21 consecutive days. Hematoxylin eosin and Nissl staining revealed that Kai Xin San protected neurons against Aβ-induced damage. Furthermore, enzyme linked immunosorbent assay, western blot and polymerase chain reaction results showed that Kai Xin San decreased Aβ42 protein levels and increased expression of IDE protein, but not mRNA, in the hippocampus. Our findings reveal that Kai Xin San facilitates hippocampal Aβ degradation and increases IDE expression, which leads, at least in part, to the alleviation of hippocampal neuron injury in rats.
文摘目的了解氯喹对大鼠肝脏胰岛素降解酶(insulin-degrading enzyme,IDE)基因表达(expression of IDE gene,EIG)及酶蛋白表达(expression of IDE protein,EIP)水平的影响.方法以高脂肪饮食喂养法复制的胰岛素抵抗(insulin resistance,IR)Wistar大鼠模型为对象,检测IR大鼠肝脏EIG,EIP水平和肝脏IDE活性,并测定大鼠的平均葡萄糖输注率(glucose infusion rate,GIR60-120),同时观察氯喹对上述指标的影响.结果IR大鼠的EIG,EIP水平显著高于常规饲料喂养的对照大鼠.服用氯喹后,IR大鼠EIG,EIP水平显著降低,对照大鼠的上述指标无明显改变.IR大鼠和对照大鼠的肝脏IDE活性均与EIG,EIP水平呈显著正相关,而与GIR60-120呈显著负相关.结论氯喹降低IR大鼠IDE活性可能是通过抑制IDE基因转录,从而降低IDE酶蛋白表达量来实现.
