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        銀杏葉提取物防治阿爾茨海默病的研究新進(jìn)展

        2016-02-17 17:49:08李為貴王彬彬付紅燕
        關(guān)鍵詞:內(nèi)質(zhì)網(wǎng)銀杏葉內(nèi)酯

        李為貴  王彬彬  付紅燕

        湖北省鄂東醫(yī)療集團(tuán)黃石市中醫(yī)醫(yī)院內(nèi)科,湖北黃石 435000

        銀杏葉提取物防治阿爾茨海默病的研究新進(jìn)展

        李為貴王彬彬付紅燕

        湖北省鄂東醫(yī)療集團(tuán)黃石市中醫(yī)醫(yī)院內(nèi)科,湖北黃石435000

        阿爾茨海默?。ˋD)是嚴(yán)重危害中老年人健康的神經(jīng)系統(tǒng)退行性疾病,積極尋求防治AD的有效策略,已經(jīng)成為重大的公共衛(wèi)生問題。銀杏葉提取物銀杏葉提取物(EGb)是目前臨床防治AD的常用藥物之一,并且具有較為理想的效果。EGb761可保護(hù)血腦屏障結(jié)構(gòu)與功能,其機(jī)制與EGb761改善細(xì)胞活力、抑制細(xì)胞凋亡與內(nèi)源性活性氧生成和下調(diào)晚期糖化終產(chǎn)物受體表達(dá)等密切相關(guān);EGb可明顯促進(jìn)熱休克蛋白70和葡萄糖調(diào)節(jié)蛋白表達(dá),激活內(nèi)質(zhì)網(wǎng)應(yīng)激和Akt信號(hào)通路,從而抑制β-淀粉樣蛋白(Aβ)的神經(jīng)毒性,保護(hù)神經(jīng),以兔受損。本文對(duì)EGb在防治AD中的作用與機(jī)制研究的新進(jìn)展進(jìn)行綜述。

        阿爾茨海默??;銀杏葉提取物EGb;機(jī)制

        [Abstract]A1zheimer's disease(AD)is a serious nervous system degenerative disease,which damages to the hea1th of midd1e-aged and e1der1y peop1e.It is a major pub1ic hea1th prob1em to seek effective strategies for prevention and treatment of AD.Ginkgo bi1oba extract(EGb)is one of the common drugs to prevent and to treat AD and has an idea1 effect.EGb761 has protective effects on the structure and function,which may be re1ated to the decrease in Aβ-triggered ce11 injury,ce11s apoptosis and intrace11u1ar reactive oxygen species generation,and down-expression of receptor for advanced g1ycation end-products.EGb has neuroprotective effects,which may be re1ated to endop1asmic reticu1um stress activation and upexpression of HSP70 and GRP78 expression,and subsequent activation of Akt signa1ing pathway.The nove1 progress of effects and mechanisms of EGb for the prevention and treatment of AD was summarized in the present paper.

        [Key words]A1zheimer's disease;Ginkgo bi1oba extract;Mechanism

        阿爾茨海默病(A1zheimer's disease,AD)是一種以認(rèn)知功能障礙和近期記憶障礙為主要臨床表現(xiàn)和以進(jìn)行性中樞神經(jīng)系統(tǒng)(centra1 nervous system,CNS)退行性變化為主要特征的疾病,其腦部主要病理學(xué)特征為大腦皮質(zhì)萎縮和神經(jīng)細(xì)胞喪失等,是癡呆的最常見類型[1-2],嚴(yán)重危害中老年人的健康和生活質(zhì)量。AD發(fā)病機(jī)制尚未完全闡明,臨床上也缺乏有效的防治措施。深入闡明AD的發(fā)生機(jī)制,積極尋求防治AD的有效策略,這已經(jīng)成為重大的公共衛(wèi)生問題。中醫(yī)藥在防治AD方面展示其獨(dú)特優(yōu)勢(shì)和前景,如銀杏葉提取物(Ginkgo bi1oba extract,EGb)在防治AD中具有較為理想的效果[3],本文對(duì)此研究領(lǐng)域的最新進(jìn)展進(jìn)行綜述。

        1 AD發(fā)生的主要新機(jī)制

        Aβ沉積在腦實(shí)質(zhì)引起CNS損傷是AD的特征性病理改變。近期研究發(fā)現(xiàn)血腦屏障損傷新機(jī)制:Aβ除引起CNS損傷,Aβ沉積于腦微血管壁可引起血管內(nèi)皮細(xì)胞損傷和血腦屏障功能障礙,這也是AD的重要病理變化特征[4]。Aβ沉積于腦血管系統(tǒng),破壞血腦屏障結(jié)構(gòu)的完整性,導(dǎo)致血腦屏障功能受損和腦血流減少,腦內(nèi)毒性代謝產(chǎn)物堆積,從而加速AD病變進(jìn)展[4-7]。

        2 EGb的應(yīng)用

        銀杏屬于銀杏科植物(Ginkgo biloba L.),銀杏葉為銀杏科植物銀杏的葉,EGb是從銀杏葉中提取的具有獨(dú)特藥理活性的混合物。國(guó)際上標(biāo)準(zhǔn)銀杏葉提取物是按德國(guó)Schwabe專利工藝生產(chǎn)的EGb761[8]。一系列研究認(rèn)為,EGb的主要活性成分有:①黃酮類,主要有三羥黃酮等,約占EGb總成分的24%[9];②萜內(nèi)酯類,主要包括銀杏內(nèi)酯類和雙葉內(nèi)酯,約占EGb總成分的6%[10];③有機(jī)酸類,主要包括香草酸等,其中喹啉酸屬于興奮性氨基酸拮抗劑,具有減輕神經(jīng)細(xì)胞損傷和腦部缺血的作用,占EGb總成分的5%~10%[11]。還含有聚戊烯醇類酯等[12]?;钚猿煞挚傸S酮醇苷及銀杏內(nèi)酯有擴(kuò)張血管和改善微循環(huán)等作用[13]。EGb對(duì)多種疾病都具有一定的治療作用[14]。

        3 EGb在防治阿爾茨海默病中的效果與機(jī)制

        EGb可明顯改善AD患者認(rèn)知功能和學(xué)習(xí)記憶功能,被認(rèn)為是“記憶增強(qiáng)劑”,具有清除活性氧自由基、改善線粒體功能、抑制Aβ神經(jīng)毒性和促進(jìn)神經(jīng)元再生與修復(fù)等作用[15-16]。EGb具有促進(jìn)血液循環(huán)和改善認(rèn)知等功能,是臨床改善腦缺血和AD等疾病認(rèn)知功能的重要藥物[15]。夏世金[17-18]課題組研究最新發(fā)現(xiàn),EGb761可抑制Aβ誘導(dǎo)的血腦屏障損傷,其機(jī)制與EGb761改善細(xì)胞活力、抑制細(xì)胞凋亡與內(nèi)源性活性氧(reactive oxygen species,ROS)生成和抑制晚期糖化終產(chǎn)物受體(receptorforadvancedg1ycationend-products,RAGE)表達(dá)密切相關(guān);EGb可促進(jìn)熱休克蛋白70(heat shock protein 70,HSP70)和葡萄糖調(diào)節(jié)蛋白78(g1ucose-regu1ated protein 78,GRP78)表達(dá),激活內(nèi)質(zhì)網(wǎng)應(yīng)激(endop1asmic reticu1um stress,ERS)和Akt信號(hào)通路,抑制Aβ神經(jīng)毒性,保護(hù)神經(jīng)功能。

        3.1EGb保護(hù)血腦屏障

        血腦屏障是機(jī)體重要屏障之一,對(duì)維持腦內(nèi)環(huán)境穩(wěn)定和保證大腦正常功能極為重要[19-20]。腦微血管內(nèi)皮細(xì)胞(brain microvascu1ar endothe1ia1 ce11s,BMEC)是血腦屏障的基本骨架[19]。BMEC以其顯著的特異性在血腦屏障特性及物質(zhì)轉(zhuǎn)運(yùn)功能中發(fā)揮重要作用[21-22]。Hartz等[23]證實(shí),AD患者存在血腦屏障結(jié)構(gòu)完整性受損,緊密連接(tight junction,TJ)蛋白水平顯著降低。在體動(dòng)物及體外細(xì)胞研究也發(fā)現(xiàn)Aβ可引起TJ蛋白水平下降和血腦屏障通透性增加[23-25]。血腦屏障功能及其低滲性主要依賴于內(nèi)皮間TJ,后者是血腦屏障功能的重要結(jié)構(gòu)基礎(chǔ)和功能保障。各種原因引起的TJ破壞都將導(dǎo)致血腦屏障損傷,繼而出現(xiàn)CNS內(nèi)環(huán)境紊亂,加速中樞病變進(jìn)展[26]。TJ主要由相關(guān)鉸鏈蛋白ZO(ZO-1、2、3)、C1audin(C1audin-1、3、5、12)和Occ1udin構(gòu)成[19-20,27]。血腦屏障結(jié)構(gòu)完整性與TJ正常組合開放及關(guān)閉有關(guān),TJ蛋白表達(dá)減少或蛋白分布異常均能引起TJ結(jié)構(gòu)改變,導(dǎo)致血腦屏障結(jié)構(gòu)完整性破壞和通透性增加。研究中血腦屏障通透性增加可能與TJ蛋白減少有關(guān)。Wan等[17]研究發(fā)現(xiàn),Aβ處理內(nèi)皮細(xì)胞后,ZO-1、C1audin-5及Occ1udin等內(nèi)皮細(xì)胞間緊密連接蛋白含量減少,血腦屏障受損;而EGb761能抑制Aβ誘導(dǎo)的血腦屏障損傷,上調(diào)ZO-1,C1audin-5和Occ1udin表達(dá),保護(hù)血腦屏障,其機(jī)制與EGb761改善細(xì)胞活力、抑制細(xì)胞凋亡與內(nèi)源性ROS生成等相關(guān)。

        3.2EGb抑制RAGE表達(dá)

        RAGE是晚期糖化終產(chǎn)物(advanced g1ycation endproducts,AGEs)的一種特征性細(xì)胞表面受體,屬于兔疫球蛋白超家族成員。RAGE除與AGEs結(jié)合,還能與高遷移率族蛋白-1(high mobi1ity group box 1,HMGB-1)和Aβ等多種配體結(jié)合調(diào)節(jié)細(xì)胞生命活動(dòng)[28]。Aβ-RAGE相互作用還能激活核因子-кB(nuc1ear factor-кB,NF-кB),上調(diào)RAGE表達(dá),激活A(yù)β介導(dǎo)的正反饋損傷效應(yīng)[28-30]。腦內(nèi)RAGE表達(dá)上調(diào)與AD神經(jīng)元損傷相關(guān)。BMEC上極微量表達(dá)的RAGE是參與血腦屏障轉(zhuǎn)運(yùn)Aβ的重要載體之一,其與低密度脂蛋白受體相關(guān)蛋白-1(LDH receptor re1ated protein,LRP-1)協(xié)同維持腦內(nèi)Aβ正常水平[31]。LRP-1將腦內(nèi)Aβ轉(zhuǎn)運(yùn)至外周血液循環(huán),經(jīng)肝臟代謝清除,RAGE則將血液中Aβ轉(zhuǎn)運(yùn)入腦沉積。在AD中,LRP-1表達(dá)減少,RAGE含量顯著增加[31]。Ma等[32]研究表明,基質(zhì)金屬蛋白酶(matrix meta11oproteinases,MMPs)與多種病變引起的血腦屏障通透性增加有關(guān),而抑制MMP活性能阻斷血腦屏障損傷途徑。RAGE是Aβ誘導(dǎo)血腦屏障損傷過(guò)程的重要環(huán)節(jié),其機(jī)制與RAGE介導(dǎo)Aβ細(xì)胞毒性、激活RAGE下游信號(hào)途徑、引起MMP-2與MMP-9表達(dá)相關(guān)[26]。Wan等[17]研究發(fā)現(xiàn),EGb761能顯著抑制RAGE表達(dá),從而改善AD中血腦屏障功能。

        3.3EGb激活內(nèi)質(zhì)網(wǎng)應(yīng)激

        ERS與AD密切相關(guān)[33-34]。Song等[35]研究顯示,Aβ可通過(guò)激活ERS介導(dǎo)細(xì)胞凋亡,從而加速AD進(jìn)程。淀粉樣蛋白假說(shuō)(Amy1oid cascade hypothesis)認(rèn)為,Aβ沉積可進(jìn)一步引起SP形成、tau蛋白的過(guò)度磷酸化和神經(jīng)元凋亡等一系列事件[36-37]。HSP70可作為分子伴侶蛋白指導(dǎo)錯(cuò)誤折疊蛋白的再折疊,增強(qiáng)HSP70的表達(dá)可抑制蛋白質(zhì)錯(cuò)誤折疊所引起的神經(jīng)毒性,還能增強(qiáng)細(xì)胞的抗氧化應(yīng)激和抗凋亡能力,從而保護(hù)細(xì)胞,以兔其受損[38-39]。此外,HSP70的過(guò)表達(dá)在AD動(dòng)物模型及細(xì)胞模型中被認(rèn)為具有保護(hù)作用[40-41]。Aβ亦可引起內(nèi)質(zhì)網(wǎng)應(yīng)激,并激活線粒體和內(nèi)質(zhì)網(wǎng)介導(dǎo)的細(xì)胞凋亡途徑[42-43],而具有內(nèi)質(zhì)網(wǎng)應(yīng)激的標(biāo)志蛋白之稱的GRP78則被募集,GRP78與異常堆積蛋白結(jié)合,維持內(nèi)質(zhì)網(wǎng)內(nèi)環(huán)境穩(wěn)態(tài),增強(qiáng)細(xì)胞抗應(yīng)激能力[44]。Liu等[18]研究發(fā)現(xiàn),EGb能明顯減少細(xì)胞凋亡發(fā)生,明顯上調(diào)細(xì)胞內(nèi)HSP70和GRP78蛋白表達(dá),以激活內(nèi)質(zhì)網(wǎng)應(yīng)激,減緩內(nèi)質(zhì)網(wǎng)途徑細(xì)胞凋亡,從而抑制Aβ1-42神經(jīng)毒性,EGb的這種神經(jīng)保護(hù)作用可能與其激活A(yù)kt信號(hào)通路有關(guān)。

        然而,上述研究?jī)H僅以體外研究為主,對(duì)RAGE在AD中血腦屏障損傷中的作用仍需更多和更深入的探索,需要開展在體研究加以驗(yàn)證,同時(shí)還將從炎癥等角度進(jìn)一步闡述RAGE參與血腦屏障損傷的機(jī)制,為揭示RAGE的關(guān)鍵作用與機(jī)制提供更多實(shí)驗(yàn)依據(jù),對(duì)深入闡明EGb防治AD的作用與機(jī)制具有重要的理論意義和應(yīng)用價(jià)值。

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        The novel progress of the prevention and treatment of Ginkgo biloba extract for Alzheimer's disease

        LI Weigui WANG BinbinFU Hongyan
        Department of Interna1,Huangshi TCM Hospita1,Edong Hea1thcare,Hubei Province,Huangshi 435000,China

        R961.1

        A

        1673-7210(2016)04(c)-0061-04

        李為貴(1965.1-),男,副主任醫(yī)師,主要從事中西醫(yī)結(jié)合防治內(nèi)科疾病的臨床與科研。

        付紅燕(1967.1-),女,主任醫(yī)師,主要從事中西醫(yī)結(jié)合治療肛腸病的的臨床與科研。

        2016-01-12本文編輯:趙魯楓)

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