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      與乙醇作用相關(guān)的CRF對(duì)腦功能的影響

      2018-08-15 00:42:40呂鑫鄒丹張雅婷廖海清唐小雨于桉國
      關(guān)鍵詞:神經(jīng)肽杏仁核拮抗劑

      呂鑫,鄒丹,張雅婷,廖海清,唐小雨,于桉國

      (1.沈陽醫(yī)學(xué)院基礎(chǔ)醫(yī)學(xué)院2013級(jí)臨床醫(yī)學(xué)專業(yè),遼寧 沈陽 110034;2.基礎(chǔ)醫(yī)學(xué)院病理生理學(xué)教研室;3.2014級(jí)臨床醫(yī)學(xué)專業(yè))

      在中樞神經(jīng)系統(tǒng)中,神經(jīng)肽是重要的神經(jīng)調(diào)質(zhì),它們作用的發(fā)揮受G蛋白偶聯(lián)受體(G protein-coupled receptor,GPCR)調(diào)節(jié)。與經(jīng)典的神經(jīng)遞質(zhì)相比,神經(jīng)肽的釋放是頻率依賴式的,釋放后有很長(zhǎng)的半衰期,使神經(jīng)肽對(duì)細(xì)胞產(chǎn)生長(zhǎng)時(shí)間的作用。因此,神經(jīng)肽的穩(wěn)態(tài)維持對(duì)神經(jīng)活動(dòng)及由此產(chǎn)生的行為有顯著影響。促腎上腺皮質(zhì)激素釋放因子(corticotropin-releasing factor,CRF)是下丘腦合成釋放的重要的神經(jīng)肽之一,CRF表達(dá)升高是乙醇依賴戒斷后負(fù)性情緒的主要機(jī)制[1]。本文綜述了與乙醇相關(guān)的CRF對(duì)中樞神經(jīng)系統(tǒng)的影響,旨在揭示乙醇濫用的神經(jīng)機(jī)制。

      1 CRF及其受體

      CRF是由41個(gè)氨基酸組成的多肽,主要通過調(diào)節(jié)激素反應(yīng)、自主反應(yīng)及行為反應(yīng)來協(xié)調(diào)機(jī)體對(duì)應(yīng)激源的應(yīng)激反應(yīng)?,F(xiàn)代分子生物學(xué)方法確定了編碼CRF的3個(gè)旁系同源體——尿皮素1,2,3(urocortin 1,2,and 3,Ucn1,Ucn2,Ucn3)的基因序列。Ucn2和Ucn3分別被稱為頂壓素相關(guān)肽和頂壓素。研究表明:CRF及尿皮素參與多種神經(jīng)生物功能的調(diào)節(jié),包括調(diào)節(jié)進(jìn)食、焦慮、抑郁、下丘腦-垂體-腎上腺(hypothalamic-pituitaryadrenal,HPA)軸及乙醇的消耗等[2]。CRF和尿皮素通過G-蛋白偶聯(lián)的CRF受體1(CRF receptor 1,CRFR1)及 CRF 受 體 2(CRF receptor 2,CRFR2)發(fā)揮作用。CRF均可結(jié)合兩種受體,但與CRFR1有更大的親和力。Ucn1與CRFR1和CRFR2有相同的親和力,Ucn2和Ucn3是CRFR2的激動(dòng)劑[3]。CRFR1及CRFR2是與腺苷酸環(huán)化酶(AC)、三磷酸肌醇(IP3)、蛋白激酶C(PKC)等第二信使激活密切相關(guān)的GPCR[4]。

      研究表明:大腦皮質(zhì)及垂體CRFR1調(diào)節(jié)許多CRF系統(tǒng)的功能性應(yīng)激樣作用[5]。CRF和尿皮素多肽在全腦有廣泛的分布,特別在下丘腦室旁核細(xì)胞體內(nèi)濃度較高[6]。CRF和尿皮素多肽通過下丘腦及下丘腦外側(cè)通路完成對(duì)行為及神經(jīng)內(nèi)分泌功能的調(diào)節(jié)[7]。

      2 乙醇與CRF及其受體拮抗劑

      乙醇具有脂溶性和親神經(jīng)性,可迅速通過血腦屏障和神經(jīng)細(xì)胞膜,引起下丘腦CRF的釋放,啟動(dòng)HPA軸的激活[8]。在中樞神經(jīng)系統(tǒng),低濃度的CRF可影響神經(jīng)元的性能,CRF可加強(qiáng)N-甲基-D-天冬氨酸(N-methyl-D-aspartate,NMDA)受體介導(dǎo)的突觸傳遞[9]。乙醇也調(diào)節(jié)參與行為應(yīng)激反應(yīng)的其它神經(jīng)內(nèi)分泌CRF系統(tǒng),特別在杏仁核,CRFR1介導(dǎo)乙醇對(duì)杏仁核的影響[10]。對(duì)乙醇戒斷過程的研究發(fā)現(xiàn):CRF受體(CRF receptor,CRFR)拮抗劑在中央杏仁核給藥可反轉(zhuǎn)乙醇產(chǎn)生的焦慮樣效應(yīng)[11]。對(duì)乙醇戒斷3~5周的大鼠進(jìn)行研究表明:有乙醇依賴史的大鼠用輕微束縛應(yīng)激即可誘發(fā)焦慮樣反應(yīng)。這種應(yīng)激引起的焦慮樣反應(yīng)可被CRFR1競(jìng)爭(zhēng)性拮抗劑反轉(zhuǎn)。在戒斷過程中,增加的乙醇自身給藥也可被CRFR1競(jìng)爭(zhēng)性拮抗劑阻斷[12]。CRFR1拮抗劑(MTIP)可劑量依賴地反轉(zhuǎn)乙醇戒斷引起的焦慮效應(yīng)并阻斷有乙醇依賴史的Wistar大鼠過多的乙醇自身給藥[13]。CRF有助于乙醇依賴動(dòng)物的乙醇消耗。對(duì)乙醇依賴的動(dòng)物來說,增加的乙醇自身給藥可隨CRFR1拮抗劑的使用[14]及CRFR1的清除[15]而降低。

      研究表明:慢性CRFR1拮抗劑療法可阻斷乙醇戒斷引起的有乙醇依賴史大鼠對(duì)乙醇消耗量的增加[16]。消極情緒可通過負(fù)強(qiáng)化機(jī)制促進(jìn)與依賴相關(guān)的強(qiáng)迫性乙醇攝入[17]。CRFR拮抗劑可避免乙醇依賴的動(dòng)物過多地?cái)z入乙醇,而在非乙醇依賴的動(dòng)物中不影響乙醇的攝入。此外,CRFR拮抗劑可減弱與乙醇戒斷相關(guān)的消極情緒反應(yīng)。CRFR拮抗劑的這種保護(hù)作用由CRFR1調(diào)節(jié)[18]。

      3 CRF與中腦腹側(cè)被蓋區(qū)

      中腦腹側(cè)被蓋區(qū)接受包括邊緣前腦、下丘腦室旁核在內(nèi)的大量CRF輸入,形成對(duì)稱性或非對(duì)稱性的突觸,大多數(shù)在樹突與γ-氨基丁酸(γaminobutyric acid,GABA)或谷氨酸協(xié)同釋放[19]。中腦腹側(cè)被蓋區(qū)多巴胺神經(jīng)元表達(dá)CRFR1與CRFR2兩種受體,大約25%的中腦腹側(cè)被蓋區(qū)多巴胺神經(jīng)元表達(dá)CRF結(jié)合蛋白(CRF binding protein,CRF-BP)[20]。CRF 通過與CRFR1、CRFR2和CRF-BP相互作用調(diào)節(jié)多巴胺神經(jīng)元的活動(dòng)。乙醇的過度飲用可加強(qiáng)中腦腹側(cè)被蓋區(qū)CRFR1的活性,并增強(qiáng)此處CRFR1到NMDA受體(NMDA receptor,NMDAR)的信號(hào)傳遞[21]。CRF通過CRFR1及一種PKC-依賴的Ih電流(一種超級(jí)化激活的內(nèi)向電流)的增高而增加中腦腹側(cè)被蓋區(qū)多巴胺神經(jīng)元?jiǎng)幼麟娢坏姆烹姡?2]。隨著D2-多巴胺及GABA-B受體的激活,CRF可增強(qiáng)抑制性突觸后電流(inhibitory postsynaptic currents,IPSCs)并減慢其動(dòng)力學(xué),這種突觸后作用依賴CRFR1。在體情況下,這種通過CRF引起的增強(qiáng)效應(yīng)可由于反復(fù)暴露于中樞興奮劑及束縛應(yīng)激而衰減[23]。

      CRF能引起一種緩慢進(jìn)展的、短暫的NMDAR調(diào)節(jié)的突觸傳遞增強(qiáng)。這種作用涉及到CRFR2及PKC通路的激活及CRF-BP的存在。然而,CRF的作用僅限于表達(dá)強(qiáng)Ih電流的多巴胺神經(jīng)元[24]。除了快速興奮性谷氨酸調(diào)節(jié)的突觸傳遞外,多巴胺神經(jīng)元也表達(dá)代謝性谷氨酸受體(metabotropic glutamate receptors,mGluRs),它調(diào)節(jié)更慢的抑制性突觸傳遞。通過CRFR2-PKA通路,CRF可增加mGluRs的表達(dá),進(jìn)而刺激細(xì)胞內(nèi)貯存鈣的釋放[25]。CRF調(diào)節(jié)中腦腹側(cè)被蓋區(qū)突觸活動(dòng)是非常復(fù)雜的,CRF在多巴胺神經(jīng)元上有興奮和抑制的不同作用。總之,CRF在多巴胺神經(jīng)元的興奮作用可影響一些快速生理功能(例如動(dòng)作電位的放電率),其抑制作用涉及突觸傳遞的緩慢形式。CRF對(duì)神經(jīng)元短時(shí)程可塑性的作用可能與持續(xù)時(shí)間更長(zhǎng)的可塑性調(diào)節(jié)有關(guān)。在中腦腹側(cè)被蓋區(qū)多巴胺神經(jīng)元,NMDAR激活對(duì)長(zhǎng)時(shí)程增強(qiáng)的誘發(fā)是必需的,興奮性突觸強(qiáng)度的提高是乙醇成癮的重要細(xì)胞機(jī)制[26]。

      4 CRF與中央杏仁核

      中央杏仁核包含CRF受體及豐富的CRF纖維[27],在中央杏仁核神經(jīng)元,CRF一般與GABA同時(shí)存在[28]。在大鼠[29]及小鼠[30]中央杏仁核神經(jīng)元,急性乙醇中毒可通過增加GABA釋放誘發(fā)GABA-A受體介導(dǎo)的IPSCs。在小鼠中央杏仁核,CRFR1通過PKCε信號(hào)通路介導(dǎo)乙醇引起的IPSCs的增強(qiáng)[31]。在小鼠中央杏仁核神經(jīng)元,與乙醇作用相關(guān)的CRF可增強(qiáng)IPSCs,CRFR1(并非CRFR2)拮抗劑可阻斷CRF及乙醇的作用。此外,在CRFR2敲除小鼠(非CRFR1敲除小鼠),與乙醇作用相關(guān)的CRF可增強(qiáng)IPSCs[32]。在大鼠中央杏仁核內(nèi),與乙醇作用相關(guān)的CRF可增加GABA能神經(jīng)傳遞功能。在小鼠中央杏仁核的GABA能神經(jīng)突觸,CRF及乙醇的作用與突觸前CRFR1激活有關(guān)。在中央杏仁核,CRF及GABA能系統(tǒng)的相互作用在乙醇獎(jiǎng)賞與依賴中起重要作用[16]。這表明:在嚙齒類動(dòng)物中央杏仁核,乙醇對(duì)GABA釋放的突觸前作用與CRFR1及CRF自身釋放有關(guān)。GABA和CRF可同時(shí)存在于中央杏仁核神經(jīng)元,乙醇引起的GABA釋放可能與同一細(xì)胞體或其他GABA能中間神經(jīng)元側(cè)枝上與自身受體相關(guān)的終末突觸的CRF釋放有關(guān)。這一結(jié)果增加了乙醇在對(duì)GABA能神經(jīng)元末梢作用過程中有第二信使參與的可能性。慢性乙醇暴露使中央杏仁核中CRF系統(tǒng)出現(xiàn)功能性適應(yīng)[33]。研究表明:與未經(jīng)乙醇給藥的對(duì)照組相比,有乙醇依賴史大鼠在其中央杏仁核處,CRF的最高(200 nmol/L)及次高(100 nmol/L)濃度均可明顯增強(qiáng)對(duì)IPSCs的誘發(fā)。在機(jī)體對(duì)乙醇依賴發(fā)展過程中,在中央杏仁核中的GABA能神經(jīng)傳遞上,乙醇與CRF存在重要的相互作用[16]。

      CRF-相關(guān)肽作為應(yīng)激反應(yīng)的激素和神經(jīng)調(diào)質(zhì)在情感障礙中起重要作用。研究表明:興奮性谷氨酸能突觸傳遞可被中央杏仁核及側(cè)間隔中間外側(cè)核內(nèi)兩種內(nèi)源性CRF相關(guān)肽配體[CRF大鼠/人(CRF rat/human,CRF r/h)及 Ucn 1]調(diào)節(jié)[34]。在中央杏仁核中,CRF(r/h)通過CRFR1-介導(dǎo)的突觸后作用抑制興奮性谷氨酸能傳遞,然而Ucn 1通過突觸前和突觸后CRFR2-介導(dǎo)機(jī)制促進(jìn)突觸應(yīng)答。相反,在側(cè)間隔中間外側(cè)核中,CRF通過突觸后機(jī)制引起CRFR1-介導(dǎo)的谷氨酸能突觸傳遞的易化。然而,Ucn 1通過突觸前及突觸后CRFR2-介導(dǎo)作用抑制EPSCs。CRF及其相關(guān)肽通過對(duì)CRFR1、CRFR2突觸受體的不同作用促進(jìn)或抑制中央杏仁核及側(cè)間隔中間外側(cè)核的興奮性突觸傳遞[35]。CRF調(diào)節(jié)中央杏仁核谷氨酸能突觸的作用貫穿于乙醇依賴發(fā)展的全過程[36]。在乙醇引起的情感障礙中,CRF受體可能成為臨床治療的新靶點(diǎn)。

      5 CRF與終紋床核

      終紋床核與焦慮有關(guān),有豐富的CRF和CRFRs的表達(dá)[37]。終紋床核參與調(diào)節(jié)HPA軸的活化及獎(jiǎng)賞環(huán)路,接受來自中央杏仁核的GABA能神經(jīng)纖維輸入[38]。在終紋床核,CRF的調(diào)節(jié)作用對(duì)終紋床核的興奮輸出至關(guān)重要。慢性乙醇暴露的嚙齒類動(dòng)物的戒斷及其他促進(jìn)焦慮反應(yīng)的刺激,均可引起終紋床核細(xì)胞外CRF的水平增加[39]。終紋床核內(nèi)CRF與GABA能神經(jīng)傳遞的相互作用在調(diào)節(jié)乙醇引起的焦慮中起重要作用[40]。終紋床核存在快速而強(qiáng)大的由多巴胺引起的興奮性突觸傳遞的增強(qiáng),這種功能依賴性的突觸傳遞增強(qiáng)需要CRFR1的參與,多巴胺通過局部神經(jīng)網(wǎng)絡(luò)機(jī)制引起CRF釋放。終紋床核內(nèi)細(xì)胞外多巴胺水平的升高可能是乙醇濫用的結(jié)果,在此區(qū)域內(nèi)谷氨酸能突觸傳遞的CRFR1依賴性增強(qiáng)可能是乙醇濫用的關(guān)鍵[41]。

      Francesconi等[42]在終紋床核前部的近囊核研究了對(duì)乙醇拖延戒斷的影響。終紋床核前部的近囊核接受來自基底外側(cè)杏仁核與島葉皮層的谷氨酸能神經(jīng)投射以及來自中腦的多巴胺神經(jīng)纖維輸入,終紋床核前部的近囊核發(fā)出GABA能投射纖維到杏仁核的中間部和其他腦區(qū)。對(duì)終紋床核高頻電刺激(high-frequency stimulation,HFS)發(fā)生反應(yīng)的終紋床核前部的近囊核神經(jīng)元,其固有興奮性的長(zhǎng)時(shí)程增強(qiáng)(long-term potentiation of the intrinsic excitability,LTP-IE)在稽延性乙醇戒斷中受損。服用選擇性CRFR1拮抗劑(R121919),可使有乙醇依賴史的動(dòng)物終紋床核前部的近囊核LTP-IE正常化。此外,反復(fù)服用CRF可產(chǎn)生終紋床核前部的近囊核LTP-IE降低。多巴胺能神經(jīng)傳遞對(duì)終紋床核前部的近囊核神經(jīng)元的LTP-IE的誘發(fā)是必須的,此過程有多巴胺D1受體參與。因此,在乙醇依賴稽延性戒斷過程中,中樞應(yīng)激系統(tǒng)的激活及多巴胺能神經(jīng)傳遞的改變可能有助于終紋床核前部的近囊核內(nèi)LTP-IE的破壞。終紋床核前部的近囊核固有的神經(jīng)元可塑性損傷可能導(dǎo)致不恰當(dāng)?shù)纳窠?jīng)元的整合進(jìn)而降低中央杏仁核抑制,促進(jìn)乙醇依賴后個(gè)體稽延性戒斷中消極情感狀態(tài)的出現(xiàn)。

      6 展望

      神經(jīng)肽的調(diào)節(jié)作用已成為乙醇研究領(lǐng)域焦點(diǎn),CRF參與應(yīng)激-乙醇相互作用。急、慢性乙醇暴露改變腦內(nèi)多種神經(jīng)肽的釋放及調(diào)節(jié)作用。乙醇作用引起的神經(jīng)性適應(yīng)可能反映機(jī)體的自我平衡或代償機(jī)制。神經(jīng)肽成為研究乙醇作用機(jī)制的指標(biāo),開辟了治療乙醇濫用的新思路。迄今為止,科研人員僅對(duì)腦內(nèi)少數(shù)神經(jīng)肽的乙醇相關(guān)性作用進(jìn)行了研究,全面闡明神經(jīng)肽如何參與乙醇的中樞作用成為亟待解決的問題。

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