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槲皮素在制備預(yù)防及治療與ApoE蛋白水平有關(guān)疾病的藥物中的應(yīng)用

文檔序號(hào):9653610閱讀:368來(lái)源:國(guó)知局
槲皮素在制備預(yù)防及治療與ApoE蛋白水平有關(guān)疾病的藥物中的應(yīng)用
【技術(shù)領(lǐng)域】
[0001]本發(fā)明涉及槲皮素,尤其是涉及槲皮素在制備預(yù)防及治療與ApoE蛋白水平有關(guān)疾病的藥物中的應(yīng)用。
【背景技術(shù)】
[0002]阿爾茨海默病(alzheimer s disease, AD)是一種與年齡密切相關(guān)的神經(jīng)退行性疾病,主要病理特征為腦神經(jīng)細(xì)胞外出現(xiàn)淀粉樣蛋白(Αβ)聚集的老年斑和腦神經(jīng)細(xì)胞內(nèi)Tau蛋白異常聚集形成的神經(jīng)纖維纏結(jié)。大量證據(jù)表明,Αβ在大腦中的積累、沉積是AD發(fā)病早期重要特征和發(fā)病機(jī)制。Αβ的積累、聚集和沉積在AD發(fā)病過程中起著重要作用,大腦中過量的Αβ會(huì)引起神經(jīng)炎癥和神經(jīng)毒性從而引發(fā)AD。因此,促進(jìn)Αβ從大腦中清除,減少Αβ在大腦中積累是治療AD的有效途徑。載脂蛋白E(apolipoprotein E,ApoE)是一種與膽固醇類物質(zhì)運(yùn)輸相關(guān)的血漿蛋白,能結(jié)合血液中的脂肪和細(xì)胞表面受體,在生物體內(nèi)起著十分重要的作用。ApoE是一種多態(tài)性蛋白,與多種疾病相關(guān)。其中,ApoE的基因型多態(tài)性與AD的發(fā)病風(fēng)險(xiǎn)高度相關(guān),并且ApoE在Αβ代謝過程中起重要作用。增加AD大腦內(nèi)ApoE水平可以促進(jìn)大腦Aβ清除,提高膽固醇的運(yùn)輸,維持突觸可塑性和減弱神經(jīng)炎癥反應(yīng),這些因素與AD發(fā)病密切相關(guān)。在AD患者中,ApoE在血漿及腦脊液中的表達(dá)水平往往低于正常人。因此,通過提高ApoE的水平促進(jìn)Αβ代謝、提高膽固醇的運(yùn)輸、維持突觸可塑性和減弱神經(jīng)炎癥反應(yīng)可能預(yù)防或推遲AD的發(fā)生和發(fā)展。最近研究發(fā)現(xiàn)RXRs的激動(dòng)劑bexarotene和LXRs激動(dòng)劑Τ0901317能提高大腦中ApoE的水平,促進(jìn)Αβ42的清除,緩和AD小鼠的認(rèn)知和記憶缺陷[13—15]。另外,P1glitazone(—種PPARy的激動(dòng)劑),也可以增加ApoE表達(dá),減少淀粉樣斑的形成,改善AD小鼠記憶[9]。這些研究表明,提高ApoE的表達(dá)水平與脂化程度可以有效促進(jìn)Αβ清除,減少AD模型小鼠淀粉樣斑形成并改善小鼠AD相關(guān)癥狀,對(duì)以ApoE作為AD治療靶點(diǎn)具有重要的指導(dǎo)意義。
[0003]實(shí)驗(yàn)中所用ApoE3或apoE4基因替換星形膠質(zhì)細(xì)胞系(immortalized astrocytes)來(lái)源于人類ApoE3或apoE4基因替換小鼠Apoe基因的轉(zhuǎn)基因小鼠轉(zhuǎn)基因小鼠模型為表達(dá)5種家族性AD突變基因(3xAPP[K670N/M671L(Swedish) + I716V(Florida)+V717I(London)and 2xPSl [M146L+L286V]])的轉(zhuǎn)基因小鼠模型[17]。實(shí)驗(yàn)中分別用TBS緩沖液(Tris-HCl), TBSX緩沖液(包含1 % Triton X-100)和⑶N-HC1 (含5M鹽酸胍緩沖液)分別提取TBS可溶性,TBSX緩沖液可溶和不溶性(GDN-HC1中可溶)Αβ[18]。
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