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      二十二碳六烯酸神經(jīng)保護(hù)作用的研究進(jìn)展

      2015-04-03 11:08:29黃玉莎
      實(shí)用藥物與臨床 2015年6期
      關(guān)鍵詞:腦損傷抗炎氧化應(yīng)激

      程 燕,黃玉莎,王 斌

      0 引言

      二十二碳六烯酸(Docosahexaenoic acid,DHA)是一種 n-3長(zhǎng)鏈多不飽和脂肪酸(n-3PUFAs),主要來(lái)源于海藻類,所以魚類和海洋油含量豐富。人類內(nèi)源性DHA含量極低,需要從食物補(bǔ)充,世界衛(wèi)生組織推薦每日攝入200~500 mg的EPA和DHA以預(yù)防某些慢性疾?。?]。在人體除脂肪組織外,神經(jīng)組織含豐富的脂質(zhì),約占神經(jīng)組織的30% ~60%,含豐富的 DHA[2]。DHA 是最重要的膜磷脂成分,在磷脂酰乙醇胺和磷脂酰絲氨酸含量最多,影響神經(jīng)遞質(zhì)通路、突觸傳遞和信號(hào)轉(zhuǎn)導(dǎo)。DHA某些代謝產(chǎn)物也是生物活性分子,可保護(hù)機(jī)體免受氧化損傷。研究發(fā)現(xiàn),n-3PUFAs具有調(diào)節(jié)免疫反應(yīng)及心血管功能、抗炎、抗氧化、抗腫瘤等多種功能,DHA作為其重要的一員,也受到廣泛關(guān)注,在生理學(xué)和醫(yī)學(xué)方面得到廣泛應(yīng)用,現(xiàn)就其對(duì)神經(jīng)系統(tǒng)的作用機(jī)制做一綜述。

      1 DHA在神經(jīng)細(xì)胞水平的作用

      1.1 對(duì)細(xì)胞信號(hào)轉(zhuǎn)導(dǎo)的影響 DHA是質(zhì)膜磷脂中長(zhǎng)鏈不飽和脂肪酸最主要的成分。細(xì)胞膜上的DHA對(duì)細(xì)胞內(nèi)信號(hào)轉(zhuǎn)導(dǎo)有重要作用。DHA對(duì)于維持細(xì)胞膜的穩(wěn)定性和流動(dòng)性至關(guān)重要,細(xì)胞膜流動(dòng)有利于細(xì)胞信號(hào)轉(zhuǎn)導(dǎo)[3]。DHA能順應(yīng)細(xì)胞膜各種狀態(tài)的轉(zhuǎn)變,如高滲透、壓縮、融合及翻轉(zhuǎn)[4]。DHA在調(diào)節(jié)腦磷脂(PS)含量中起重要作用,而PS對(duì)于維持細(xì)胞生存很重要。缺乏DHA會(huì)使PS含量減少,影響細(xì)胞信號(hào)和鈣離子攝入。DHA是細(xì)胞內(nèi)作用最強(qiáng)的鈣離子濃度調(diào)節(jié)劑,通過控制鈣離子釋放或攝入調(diào)節(jié)許多細(xì)胞功能,促進(jìn)基因活化、神經(jīng)遞質(zhì)釋放、氧化應(yīng)激或調(diào)節(jié)線粒體生物活性[2]。另外,近年研究表明,在重要的細(xì)胞信號(hào)中,DHA可以修飾蛋白質(zhì)和細(xì)胞膜脂筏構(gòu)成,后者是質(zhì)膜上富含膽固醇和鞘磷脂的微結(jié)構(gòu)域,參與信號(hào)轉(zhuǎn)導(dǎo)和蛋白質(zhì)的轉(zhuǎn)運(yùn)[5]。

      DHA可影響神經(jīng)細(xì)胞生理過程的多個(gè)靶點(diǎn)功能,從離子通道、核受體到第二信使。如:DHA對(duì)維持Na+-K+-ATP酶活性很重要,后者是細(xì)胞膜關(guān)鍵酶,可控制神經(jīng)傳導(dǎo)需要的離子濃度梯度[2]。這種活性酶釋放的能量占大腦所需能量的60%,是維持大腦正常生理過程的重要來(lái)源。鉀通道參與多種神經(jīng)系統(tǒng)疾病,其神經(jīng)保護(hù)作用通過激活多不飽和脂肪酸等實(shí)現(xiàn)[6]。DHA還可以改變腦內(nèi)游離鋅的水平,從而發(fā)揮神經(jīng)保護(hù)作用[7]。體外實(shí)驗(yàn)發(fā)現(xiàn),n-3脂肪酸(如DHA)會(huì)抑制PKC、cAMP依賴的蛋白激酶、促分裂原活化蛋白激酶(MAPKs,如 ERK1、ERK2)及鈣/鈣調(diào)蛋白依賴的蛋白激酶2(Ca/CaMKⅡ)的活性[8]。但近期研究表明,在腫瘤細(xì)胞中,DHA可激活MAPKs,使線粒體產(chǎn)生過量ROS而誘導(dǎo)細(xì)胞凋亡[9]。兩種矛盾的結(jié)論提示,不同狀態(tài)下DHA的功能可能不同。DHA還會(huì)抑制電壓特異性鈉通道和鈣通道,阻斷去極化引起的谷氨酸釋放及谷氨酸受體活化,這樣就會(huì)降低谷氨酸引起的興奮毒性[10]。之后,Grintal等[11]研究表明,DHA僅在生理狀態(tài)下調(diào)節(jié)突觸谷氨酸,病理?xiàng)l件下不影響谷氨酸的清除,但未闡明具體機(jī)制及原因。在飲食缺乏DHA的小鼠大腦中,參與囊泡運(yùn)輸、重?cái)z取及神經(jīng)遞質(zhì)等過程的多數(shù)突觸蛋白數(shù)量下調(diào)[12]。大腦突觸蛋白缺乏及其導(dǎo)致的胞外分泌、神經(jīng)遞質(zhì)釋放和再攝取減少可能與DHA耗竭有關(guān)??傊珼HA通過多種途徑維持正常神經(jīng)功能。

      1.2 對(duì)炎癥信號(hào)通路的影響 氧化應(yīng)激和炎癥反應(yīng)參與許多神經(jīng)疾病的進(jìn)展,包括神經(jīng)退行性疾病(阿爾茲海默病)、肌萎縮側(cè)索硬化、帕金森病、癲疒間和缺血損傷[13-16]。在培養(yǎng)的視網(wǎng)膜神經(jīng)細(xì)胞中,DHA可以清除過氧化氫、超氧陰離子和羥自由基引起的細(xì)胞內(nèi)自由基產(chǎn)物,對(duì)抗氧化應(yīng)激起到保護(hù)作用。DHA在體內(nèi)會(huì)代謝成保護(hù)素(Protectins)和消退素(Resolvins),不僅能緩解炎癥,還有神經(jīng)保護(hù)作用,抑制多種粘附分子和炎癥介質(zhì)的表達(dá)和釋放[17]。保護(hù)素和消退素均可通過減少中性粒細(xì)胞遷移和炎癥因子釋放發(fā)揮強(qiáng)大的抗炎和免疫調(diào)節(jié)作用,減少中性粒細(xì)胞向損傷組織遷移,減少局部炎癥應(yīng)答,發(fā)揮保護(hù)作用,防止中性粒細(xì)胞激活導(dǎo)致的氧化應(yīng)激[18]。在DHA衍生物中,神經(jīng)保護(hù)素 D1(NPD1)是重要的神經(jīng)保護(hù)因子,在多種神經(jīng)退行性疾病中能減輕組織的氧化應(yīng)激和炎癥反應(yīng)[19],通過上調(diào)抗凋亡因子bcl-2、bcl-x及下調(diào)促凋亡因子bax、bad減輕氧化應(yīng)激,通過抑制腫瘤壞死因子(TNF)-α和白介素(IL)-1β發(fā)揮抗炎作用[20],通過減弱星形膠質(zhì)細(xì)胞內(nèi)質(zhì)網(wǎng)(ER)鈣調(diào)節(jié)異常和ER應(yīng)激減輕缺血腦損傷[21]。

      在缺氧/缺血損傷(H/I)的新生大鼠神經(jīng)膠質(zhì)細(xì)胞中,n-3脂肪酸可抑制NF-κB活性及下游炎癥介質(zhì)釋放[22]。培養(yǎng)DHA處理的巨噬細(xì)胞發(fā)現(xiàn),DHA可降低內(nèi)毒素(LPS)激活的NF-κB活性,減少IL-1β分泌,增加自噬體合成,從而達(dá)到抑制炎癥反應(yīng)的作用[23]。飽和脂肪酸加強(qiáng)巨噬細(xì)胞NF-κB活性,與不飽和脂肪酸作用相反[24]。由此可見,包括DHA在內(nèi)的n-3PUFAs對(duì)多種細(xì)胞都有抗炎作用。

      DHA對(duì)過氧化物酶體增殖活化受體(PPARs)信號(hào)通路的影響最大。PPARs是一組核受體蛋白,相當(dāng)于調(diào)節(jié)基因表達(dá)的轉(zhuǎn)錄因子,包括PPAR-α、PPAR-γ、PPAR-β/ζ,這些受體激活后會(huì)抑制炎癥因子產(chǎn)生,導(dǎo)致全身及腦內(nèi)炎癥大量減少?;罨腜PARs可減弱免疫應(yīng)答,加強(qiáng)細(xì)胞代謝和線粒體功能,促進(jìn)軸突生長(zhǎng),誘導(dǎo)祖細(xì)胞分化為髓鞘少突膠質(zhì)細(xì)胞[25]。生理?xiàng)l件下,新生大鼠腦和神經(jīng)干細(xì)胞表達(dá)PPAR-γ,活化的PPAR-γ會(huì)誘導(dǎo)神經(jīng)分化因子表達(dá),促進(jìn)神經(jīng)發(fā)育,所以激活PPAR-γ通路可作為神經(jīng)退行性疾病和腦損傷的治療靶點(diǎn)[26]。在創(chuàng)傷性腦損傷(TBI)和神經(jīng)退行性疾病的動(dòng)物實(shí)驗(yàn)中發(fā)現(xiàn),PPARs激動(dòng)劑可減輕炎癥損傷和細(xì)胞死亡,促進(jìn)中樞神經(jīng)系統(tǒng)修復(fù)和功能恢復(fù)[25]。DHA能增加體外培養(yǎng)的人體腎臟細(xì)胞(HK-2)PPAR-γmRNA的表達(dá)和蛋白活性,激活的PPAR-γ能有效抑制NF-κB通路,從而減輕組織臟器的炎癥反應(yīng)[27-28]。

      另外,攝入高含量的DHA飲食會(huì)通過置換細(xì)胞膜花生四烯酸(促炎因子前體)和膽固醇降低產(chǎn)生炎癥介質(zhì)的生物前體,減輕炎癥損傷[29]。DHA通過其衍生物消退素也會(huì)抑制花生四烯酸產(chǎn)物-類四烯酸引起的炎癥??傊珼HA及其衍生物(消退素、保護(hù)素)可通過抗炎和促分解作用起神經(jīng)保護(hù)作用。

      1.3 對(duì)神經(jīng)突觸的影響 DHA可促進(jìn)神經(jīng)突觸生長(zhǎng),增加突觸蛋白的合成及谷氨酸受體的表達(dá)。當(dāng)飼料中缺乏DHA時(shí),妊娠小鼠大腦海馬神經(jīng)元的神經(jīng)突生長(zhǎng)和突觸發(fā)生受到抑制,而補(bǔ)充DHA后,受影響的神經(jīng)元得以改善[30]。結(jié)果表明,在正常神經(jīng)發(fā)育過程中,DHA對(duì)神經(jīng)突觸生長(zhǎng)至關(guān)重要。有研究者用含或不含DHA的食物喂養(yǎng)妊娠小鼠至第3代,之后構(gòu)建TBI模型,發(fā)現(xiàn)DHA缺乏的小鼠損傷加重,損傷區(qū)域神經(jīng)元明顯減少,功能恢復(fù)滯后。此外,突觸蛋白I(Syn-1,一種突觸含量豐富的磷酸化蛋白)明顯減少,說(shuō)明DHA在TBI中具有維持突觸功能的作用[31]。Wu 等[32]對(duì)液壓顱腦損傷(FPI)大鼠以富含DHA(1.2%)食物喂養(yǎng)12 d,其腦源性神經(jīng)營(yíng)養(yǎng)因子(BDNF)上調(diào),下游的 Syn-1、cAMP反應(yīng)元件結(jié)合蛋白(CREB)及CaMKⅡ也上調(diào),維持了突觸的完整性和流動(dòng)性,改善了認(rèn)知功能。正常大鼠予富含n-3PUFAs飲食21 d,海馬神經(jīng)小膠質(zhì)細(xì)胞活性下降,同時(shí)明顯改變神經(jīng)可塑性相關(guān)基因的表達(dá),如Egr-1、BDNF和c-jun,DHA可能通過調(diào)節(jié)神經(jīng)相關(guān)基因表達(dá)起神經(jīng)保護(hù)作用[33]。

      2 DHA對(duì)神經(jīng)系統(tǒng)的作用

      嬰幼兒期是神經(jīng)發(fā)育的關(guān)鍵時(shí)期,胎兒或新生兒期出現(xiàn)窒息會(huì)影響其大腦發(fā)育,可能遺留神經(jīng)系統(tǒng)后遺癥。圍生期缺氧缺血(HI)腦損傷主要是缺氧急性損傷和再灌注損傷,涉及氧化應(yīng)激、炎癥反應(yīng)、細(xì)胞凋亡、ER應(yīng)激等病理生理過程。DHA可同時(shí)作用于腦損傷瀑布反應(yīng)的幾個(gè)階段,包括生物活性脂類、自由基、炎癥因子和凋亡,最終發(fā)揮神經(jīng)保護(hù)作用。在HI前2.5 h或HI后15 min腹腔注射DHA,雖不能降低死亡率、減輕腦損傷面積,但可以改善損傷后14 d的腦功能[34-35],對(duì)于HI損傷后的幸存患兒有重大意義,可改善預(yù)后,提高生存質(zhì)量。對(duì)急性局灶性腦缺血大鼠給予不同劑量處理后發(fā)現(xiàn),治療時(shí)間窗是3 h,低、中劑量組的大鼠神經(jīng)功能改善明顯,組織損傷區(qū)域明顯減?。?6]。Williams等[37]用 n-3 脂肪酸(富含DHA,Tri-DHA)處理HI新生大鼠,損傷后2 h給予n-3脂肪酸,腦梗死面積變小,而HI 4 h后再腹腔注射Tri-DHA無(wú)保護(hù)作用,說(shuō)明DHA早期應(yīng)用效果好。Tri-DHA注射后第8周觀察腦損傷無(wú)進(jìn)展,更加說(shuō)明DHA有利于改善HI預(yù)后。DHA喂養(yǎng)TBI大鼠3~21 d,除ER伴侶蛋白GRP78外,其他ER應(yīng)激蛋白表達(dá)均減少,DHA處理的TBI大鼠感覺運(yùn)動(dòng)功能恢復(fù)更快,DHA可能通過減少TBI后ER應(yīng)激和毒性蛋白堆積發(fā)揮神經(jīng)保護(hù)作用[38]。

      3 結(jié)語(yǔ)

      綜上所述,DHA在神經(jīng)發(fā)育等方面有極其重要的作用,主要機(jī)制涉及細(xì)胞信號(hào)通路、神經(jīng)突觸及抗炎等。DHA作為營(yíng)養(yǎng)補(bǔ)充劑的作用逐漸被認(rèn)可,但普通飲食攝入和以藥物形式攝入是有區(qū)別的[39],此外,Bauer等[2]認(rèn)為,補(bǔ)充 EPA 對(duì)神經(jīng)認(rèn)知作用比DHA好,但不同時(shí)間及生理狀態(tài)下的結(jié)果可能不同。因此,DHA藥用功效尚需基礎(chǔ)和臨床試驗(yàn)不斷驗(yàn)證,為各種神經(jīng)系統(tǒng)疾病的治療開拓思路,提供高效安全的治療方案。

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      [2] Bauer I,Crewther S,Pipingas A,et al.Does omega-3 fatty acid supplementation enhance neural efficiency?A review of the literature[J].Human Psychopharmacology:Clinical and Experimental,2014,29(1):8-18.

      [3] Ying Z,F(xiàn)eng C,Agrawal R,et al.Dietary omega-3 deficiency from gestation increases spinal cord vulnerability to traumatic brain injury-induced damage[J].PLoS ONE,2012,7(12):e52998.

      [4] Hasadsri L,Wang BH,Lee JV,et al.Omega-3 fatty acids as a putative treatment for traumatic brain injury[J].Journal of Neurotrauma,2013,30(11):897-906.

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      [6] Laigle C,Confort-Gouny S,Le Fur Y,et al.Deletion of TRAAK potassium channel affects brain metabolism and protects against ischemia[J].PLoS One,2012,7(12):e53266.

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