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        胰島素樣生長因子-I(IGF-I)在肝硬化預(yù)后評估和治療中的作用

        2025-07-31 00:00:00汪彥平鄭亞張惠芳王慧敏馬小彤陳兆峰
        臨床肝膽病雜志 2025年6期
        關(guān)鍵詞:脂質(zhì)肝細(xì)胞氧化應(yīng)激

        Abstract:Asakeymemberof theinsulin-likegrowthfactorfamily,nsulin-likegrowthfactor-I(IGF-I)ismainlysythsized intheliverandiswidelydistributedinthehumanbody,anditisivoledintephysiologicalproessssuchscellprolifation, diferentiation,metabolism,andapoptosis.StudieshaveshowtatthelevelofIGF-Iisnegativelycorelatedwiththeseverityof livercirrhosis,andIGF-Imainlyafectstheprogressionoflivercirrhosisbyinibiting liverfibrosis,promotingDNAdamage repair,andregulatinglipid metabolism.MonitoringofIGF-Ilevelisexpected toprovideanevaluationindicatorforimproving the prognosisof patientswith livercirhosis,and stimulatingtheactionpathwayofIGF-Iorregulatingitsexpresionlevelmay becomeanewmethodforthetreatmentoflivercirhosis.Thisarticlereviews theresearchadvancesinIGF-Iinlivercihosis,in ordertoprovide new ideasfor the diagnosisand treatment of liver cirrhosis.

        Keywords:Liver Cirrhosis;Hepatic Fibrosis;Insulin-Like Growth Factor I;Prognosis

        Research funding:Gansu Province Scienceand Technology Major Project Plan(23JRRA1487

        肝硬化是一種由多種慢性肝病發(fā)展而來的嚴(yán)重病理狀態(tài),其特征是肝組織的彌漫性纖維化、假小葉形成及肝細(xì)胞的再生結(jié)節(jié)。肝硬化的發(fā)病機(jī)制十分復(fù)雜,涉及多種信號通路之間的串?dāng)_、氧化應(yīng)激、代謝調(diào)節(jié)和免疫反應(yīng)[1]。目前,肝硬化已成為全球重要的公共衛(wèi)生問題[2],病程復(fù)雜且預(yù)后較差,常導(dǎo)致患者死亡[3]。然而,針對肝硬化尚無特效藥物。研究認(rèn)為肝纖維化甚至早期肝硬化是可以逆轉(zhuǎn)的,因此,積極探索其發(fā)病機(jī)制、尋求肝硬化的臨床評估和預(yù)后預(yù)測手段對于制訂個體化治療方案及預(yù)測患者生存具有重要意義。近年來,肝硬化病情評估與預(yù)后預(yù)測相關(guān)生物標(biāo)志物的研究與應(yīng)用日益增多,其中,胰島素樣生長因子-I(insulin-likegrowthfactor-I,IGF-I)作為一種重要的胰島素樣生長因子,逐漸引起了研究者的關(guān)注。多項研究表明,IGF-I水平與肝纖維化進(jìn)展呈負(fù)相關(guān),IGF-I水平越低,肝纖維化程度可能越嚴(yán)重[46]。因此,IGF-I表達(dá)水平上調(diào)可能使肝硬化患者獲益。本文對IGF-I在肝硬化發(fā)生發(fā)展中的作用機(jī)制、臨床意義及治療潛力等方面進(jìn)行綜述,旨在為肝硬化的診治提供新思路。

        1IGF-I概述

        IGF-I是一種由70個氨基酸組成的單鏈多肽,其分子結(jié)構(gòu)與胰島素相似,約 48% 的氨基酸序列與胰島素相同,屬于胰島素樣生長因子家族。IGF-I約 90% 由肝臟細(xì)胞合成和分泌[7-8],在人體內(nèi)廣泛分布,參與細(xì)胞增殖、分化、代謝及抑制細(xì)胞調(diào)亡等多種生理過程[8-11]其中,生長素釋放肽-生長激素-胰島素樣生長因子-I軸(GHRH-GH-IGF-I軸)在調(diào)節(jié)肝臟活動中扮演著關(guān)鍵角色,主要通過復(fù)雜的信號通路影響肝臟的代謝、生長、免疫和纖維化等關(guān)鍵生理病理過程。作為GH-IGF-I軸的上游調(diào)節(jié)因子,GHRH在中樞神經(jīng)系統(tǒng)與外周靶器官中均有廣泛表達(dá),通過激活生長激素促分泌素受體1a,精細(xì)調(diào)控GH與IGF-I的分泌與功能[12]。在GH的刺激下,肝臟合成并釋放IGF-I,后者通過其受體(IGF-IR)在循環(huán)系統(tǒng)中以IGF/IGFBP-3復(fù)合體的形式循環(huán),積極參與肝臟代謝的調(diào)節(jié),促進(jìn)能量代謝的高效進(jìn)行[13]。IGF-I的表達(dá)和活性受到GHRH/GH信號通路的調(diào)節(jié)[14],同時,IGF-I可以反向抑制GH分泌,在平衡GH和IGF-I分泌中發(fā)揮重要作用[15]。此外,GH-IGF-I軸可調(diào)控肝臟脂質(zhì)合成的增加,從而維持脂質(zhì)代謝的穩(wěn)態(tài)[16-17]。

        2IGF-I在肝纖維化中的作用機(jī)制

        在肝組織中,IGF-I及其受體IGF-IR對于維系肝臟正常生理功能具有不可或缺的作用。IGF-I/IGF-IR信號傳導(dǎo)體系通過激活下游信號通路(如PI3K/AKT和MAPK/ERK),深刻影響著肝細(xì)胞生長(刺激DNA合成和細(xì)胞增殖)、代謝活動(調(diào)節(jié)糖原合成與分解、脂肪酸合成及膽固醇代謝)及損傷后修復(fù)(促進(jìn)肝細(xì)胞再生、抑制凋亡并加速損傷恢復(fù))等多個方面,是維持肝臟穩(wěn)態(tài)和功能的關(guān)鍵調(diào)節(jié)因子[18-19]。IGF-I對肝纖維化過程具有顯著抑制效應(yīng),其機(jī)制涵蓋以下多個方面(圖1)。

        2.1IGF-I/IGF-IR在DNA損傷修復(fù)中的促進(jìn)作用據(jù)報道,DNA損傷激活的非編碼RNA(noncodingRNAactivatedbyDNAdamage,NORAD)進(jìn)一步調(diào)控肝纖維化進(jìn)程,并強(qiáng)調(diào)DNA損傷在肝纖維化中的核心作用[20]從肝纖維化早期到晚期,細(xì)胞周期與DNA損傷相關(guān)基因表達(dá)發(fā)生顯著變化,提示DNA修復(fù)機(jī)制在纖維化不同階段具有不同作用[21]。諸多研究發(fā)現(xiàn),肝細(xì)胞內(nèi)DNA氧化損傷是肝纖維化過程中的關(guān)鍵事件,促進(jìn)DNA修復(fù)成為減緩肝纖維化的潛在策略[22-23]。研究表明,IGF-I通過PI3K/AKT及p38/MAPK通路促進(jìn)DNA修復(fù),同時與p53通路交互作用,共同調(diào)控細(xì)胞周期與肝纖維化過

        圖1IGF-I/IGF-IR在肝纖維化中的作用機(jī)制Figure1 ThemechanismofIGF-I/IGF-IRinliverfibrosis

        程[24-27]??梢?,DNA損傷修復(fù)在肝纖維化進(jìn)程中扮演關(guān)鍵角色,而IGF-I/IGF-IR系統(tǒng)通過多途徑調(diào)控DNA修復(fù),進(jìn)而影響肝纖維化的發(fā)生與發(fā)展。

        2.2IGF-I/IGF-IR通過介導(dǎo)細(xì)胞衰老參與肝纖維化研究表明,IGF-I可通過延長作用時間,抑制核內(nèi)p53與早老素的結(jié)合,有效改善肝臟的脂肪變性和纖維化狀態(tài),進(jìn)而緩解氧化應(yīng)激誘發(fā)的肝細(xì)胞早衰[28]。值得注意的是,p53的表達(dá)上調(diào)與肝纖維化密切相關(guān),而IGF-I則具有抑制p53核內(nèi)轉(zhuǎn)位的能力,并在其表達(dá)增加時緩解肝細(xì)胞的衰老過程[29]

        2.3IGF-I/IGF-IR在氧化應(yīng)激介導(dǎo)的肝纖維化中的多重調(diào)節(jié)作用眾多研究指出,氧化應(yīng)激在肝纖維化發(fā)病機(jī)制中起關(guān)鍵作用。該應(yīng)激狀態(tài)源自活性氧(ROS)的累積,無論是ROS的過量生成還是抗氧化劑的缺乏,均能誘發(fā)氧化應(yīng)激及損傷。ROS來源多種多樣,包括NADPH氧化酶(NADPHoxidase,NOX)家族酶、一氧化氮合酶、黃嘌呤氧化酶和細(xì)胞色素P450等多種酶類。值得注意的是,在肝組織中,尤其是在HSC內(nèi),NOX的表達(dá)水平顯著上調(diào),這直接導(dǎo)致ROS的大量產(chǎn)生,并在HSC中觸發(fā)多種促纖維化反應(yīng)[30-34]

        在 CCl4 誘導(dǎo)的肝纖維化模型中,肝細(xì)胞經(jīng)歷加劇的氧化應(yīng)激與早衰,同時血漿中IGF-I濃度顯著降低。然而,IGF-I的過表達(dá)可阻斷p53-早老素信號通路,顯著緩解肝細(xì)胞的氧化應(yīng)激與早衰狀態(tài),進(jìn)而改善肝脂肪變性和肝纖維化[35-37]。同時,IGF-I通過與其受體IGF-IR結(jié)合,能夠觸發(fā)PI3K/AKT信號通路的活化,這一過程對于保護(hù)細(xì)胞免受氧化應(yīng)激損害、線粒體功能紊亂以及細(xì)胞凋亡具有關(guān)鍵作用[38-39]。有研究指出,IGF-I通過MAPK/ERK1/2而非p38MAPK通路,保護(hù)細(xì)胞免受氧化損傷,進(jìn)而有助于肝纖維化的改善[40]。部分研究還發(fā)現(xiàn)IGF-I通過解偶聯(lián)蛋白3UCP3減少線粒體膜電位,從而降低ROS水平,可能在肝纖維化中發(fā)揮保護(hù)作用[41-43]。此外,在經(jīng) H2O2 處理的誘導(dǎo)多能干細(xì)胞中,作為氧化應(yīng)激調(diào)控因子的microRNA-1的表達(dá)呈現(xiàn)上調(diào)趨勢,而IGF-I則能夠下調(diào)其表達(dá),進(jìn)而緩解氧化應(yīng)激所引發(fā)的損傷[44-45]。由此可見,IGF-I通過作用于多種信號通路,在細(xì)胞與組織氧化應(yīng)激的調(diào)控中發(fā)揮著重要作用,這進(jìn)一步彰顯了其在肝纖維化治療中的潛在價值。值得注意的是,IGF-1在特定條件下亦可促進(jìn)氧化應(yīng)激,如在脂肪細(xì)胞中刺激ROS生成,或降低肝細(xì)胞抗氧化酶活性[46]。因此,IGF-I在肝纖維化中的作用具有雙重性,需根據(jù)具體條件進(jìn)行評估與調(diào)控。

        2.4IGF-I對脂質(zhì)代謝的調(diào)控作用IGF-I在脂質(zhì)代謝中同樣發(fā)揮著重要作用。在IGF-I缺陷小鼠中,脂質(zhì)代謝相關(guān)酶的表達(dá)水平顯著下降,導(dǎo)致血脂異常,表明IGF-I與脂質(zhì)代謝之間存在緊密聯(lián)系[47]。在間充質(zhì)干細(xì)胞中,IGF-I通過AKT/mTOR/PPAR- ?γ 通路促進(jìn)脂肪生成分化,而在肌腱干細(xì)胞中,IGF-I激活 p -CREB,與BMP2激活的pSmad協(xié)同作用,上調(diào)PPAR- ?γ 的表達(dá),進(jìn)而增強(qiáng)肌腱干細(xì)胞的脂肪生成分化能力。因此,IGF-1可能與脂質(zhì)代謝相關(guān),通過PPAR抑制HSC激活,這可能是IGF-I通過脂質(zhì)代謝介導(dǎo)肝纖維化的潛在途徑[48-49]IGF-I在脂質(zhì)代謝中的作用具有雙重性。除了已知的抗脂肪分解作用外,IGF-I還能在饑餓條件下激活脂肪組織中的脂肪酸β氧化,促進(jìn)能量消耗[15.50]。這一發(fā)現(xiàn)更新了以往對IGF-I功能的認(rèn)知,并提示IGF-I在脂質(zhì)代謝調(diào)控中的復(fù)雜性。此外,GH作為IGF-I的重要上游調(diào)控因子,在脂質(zhì)代謝和肝纖維化中也發(fā)揮著重要作用。GH通過刺激IGF-I的合成與分泌,間接調(diào)控脂質(zhì)代謝和HSC活化。

        綜上所述,IGF-I通過復(fù)雜的信號通路和脂質(zhì)代謝途徑,在肝纖維化進(jìn)程中發(fā)揮著重要調(diào)控作用。深入理解IGF-I與脂質(zhì)代謝、HSC活化之間的相互作用機(jī)制,對于開發(fā)肝纖維化治療新策略具有重要意義。

        2.5IGF-I在多元代謝途徑中的調(diào)控角色I(xiàn)GF-I廣泛參與葡萄糖、谷氨酰胺等代謝途徑的調(diào)控,能夠促進(jìn)葡萄糖被細(xì)胞攝取并加以利用,這對于機(jī)體能量平衡的維持至關(guān)重要。研究顯示,IGF-I還具備調(diào)節(jié)谷氨酰胺代謝相關(guān)酶(例如谷氨酸脫氫酶)活性的功能,進(jìn)而對谷氨酰胺的代謝過程產(chǎn)生影響。通過一系列對葡萄糖和谷氨酰胺代謝途徑的調(diào)控,IGF-1確保了細(xì)胞獲得必要的能量與營養(yǎng)供給,進(jìn)而促進(jìn)細(xì)胞的生長與增殖。值得注意的是,這些代謝活動與肝纖維化的病理演變之間存在著密切的聯(lián)系。因此,IGF-I通過精確調(diào)控這些代謝通路,間接地影響肝纖維化的發(fā)展進(jìn)程[51-52]

        3IGF-I在肝硬化病程與預(yù)后評估中的作用

        3.1IGF-I水平與肝功能的關(guān)系研究顯示,肝硬化患者血清IGF-I水平顯著低于健康人群,且隨肝功能Child-Pugh分級的增高而進(jìn)行性下降[53]。此外,動物模型實驗表明,IGF-I治療能夠顯著降低由 CCl4 誘導(dǎo)的急性肝損傷小鼠的血清ALT水平,這表明IGF-I能夠改善肝細(xì)胞損傷和肝功能[54],體現(xiàn)了IGF-I對肝功能的保護(hù)作用。

        3.2IGF-I在肝硬化預(yù)后預(yù)測中的價值一項前瞻性研究表明,作為GH的主要效應(yīng)分子,IGF-I水平的變化可反映肝功能減退以及肝纖維化/肝硬化的發(fā)展進(jìn)程,這可能預(yù)示著不良的臨床結(jié)局[55]。此外,進(jìn)一步隊列研究結(jié)果支持IGF-I是非酒精性脂肪性肝病進(jìn)展中的關(guān)鍵生物標(biāo)志物,其水平波動與肝纖維化嚴(yán)重程度密切相關(guān),有望成為預(yù)測患者向肝硬化轉(zhuǎn)變的重要評估指標(biāo)[56]。上述研究表明,IGF-I水平在肝硬化病程中至關(guān)重要,有助于估計肝功能儲備或病理狀況以及預(yù)測患者預(yù)后。一項針對148例肝硬化患者的回顧性研究,根據(jù)基線血清IGF-I水平將患者分為低、中、高三組,多變量分析表明,低血清IGF-I水平是預(yù)測病死率[所有患者:風(fēng)險比 0.967,P=0.004 ;代償期患者: HR=0.927,P=0.002. 和失代償進(jìn)展 (HR=0.939,Plt;0.001) 的獨(dú)立因素[57]。研究結(jié)果強(qiáng)調(diào)了IGF-I在評估肝硬化患者肝功能儲備及預(yù)測預(yù)后中的重要性,因此,IGF-I可作為預(yù)測代償期肝硬化患者失代償相關(guān)事件的一個有用指標(biāo),監(jiān)測血清IGF-I水平有助于識別高危患者,以便早期干預(yù),改善預(yù)后。另有回顧性研究分析IGF-CTP評分系統(tǒng)對失代償性肝硬化患者1年病死率的預(yù)測能力,并與傳統(tǒng)的CTP評分和終末期肝病模型(MELD)評分進(jìn)行比較,發(fā)現(xiàn)IGF-CTP評分的受試者操作特征曲線下面積在預(yù)測1年病死率方面顯著高于CTP和MELD評分[58]。提示,IGF-CTP評分系統(tǒng)比傳統(tǒng)的CTP和MELD評分能更準(zhǔn)確地預(yù)測失代償期肝硬化患者的1年病死率,為臨床評估失代償期肝硬化患者的肝功能儲備和預(yù)測病死率提供了新的、更準(zhǔn)確的工具。綜上,IGF-I水平對肝硬化患者預(yù)后具有較高的預(yù)測效能,低水平IGF-I可能預(yù)示著患者預(yù)后不良,如更高的并發(fā)癥發(fā)生率、住院率和病死率。因此,IGF-I可作為肝硬化患者預(yù)后評估的一個重要參考指標(biāo)。然而,上述研究均為小規(guī)模的回顧性研究,可能存在潛在偏倚。因此,在未來需要前瞻性的大規(guī)模研究來進(jìn)一步證實。

        4IGF-I在肝硬化治療中的潛力

        基于動物實驗與臨床數(shù)據(jù),IGF系統(tǒng)在肝臟疾病的發(fā)生和發(fā)展中起著重要作用,特別是IGF-I在維持肝臟穩(wěn)態(tài)、調(diào)控肝細(xì)胞增殖與凋亡平衡,以及干預(yù)肝纖維化至肝硬化轉(zhuǎn)變中顯示出不可替代的重要性[13,59-60]。在肝硬化實驗?zāi)P椭?,IGF-I治療顯著可改善肝功能指標(biāo),如AST、ALT水平,并有效緩解腸道屏障功能受損[61]。同時,一項針對非酒精性脂肪性肝病/非酒精性脂肪性肝炎患者的研究發(fā)現(xiàn),調(diào)控IGF-I至生理水平有望改善患者的肝臟狀況,降低肝纖維化和肝硬化的風(fēng)險[62]

        上述研究均表明IGF-I對肝臟具有明確的保護(hù)作用,具有減輕肝細(xì)胞損傷、恢復(fù)肝功能的作用,提示IGF-I在抗纖維化與抗肝硬化方面的潛力,可能作為治療肝硬化的新靶點。

        5展望

        隨著IGF-I在肝硬化領(lǐng)域研究的不斷深入,未來研究應(yīng)聚焦于多維度、多層次地分析其在疾病進(jìn)展各階段的詳細(xì)作用機(jī)制,并加速其臨床轉(zhuǎn)化進(jìn)程。IGF-I聯(lián)合其他生物標(biāo)志物的預(yù)測效能、GH-IGF-I軸在肝臟疾病中的治療潛力、IGF-I的具體作用機(jī)制及其治療反應(yīng)性和安全性均有待更高質(zhì)量的臨床試驗和多中心研究,可能為肝臟疾病的病程進(jìn)展、治療及預(yù)后評估提供新方向。

        利益沖突聲明:本文不存在任何利益沖突。

        作者貢獻(xiàn)聲明:汪彥平負(fù)責(zé)選題,文獻(xiàn)檢索與篩選,初稿撰寫;張惠芳、王慧敏、馬小彤參與文獻(xiàn)檢索與篩選;鄭亞、陳兆峰負(fù)責(zé)擬定寫作思路,指導(dǎo)撰寫文章并最后定稿。

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        收稿日期:2024-10-08:錄用日期:2024-11-13本文編輯:劉曉紅

        引證本文:WANGYP,ZHENGY,ZHANGHF,etal.Roleofinsulin-like growth factor-Iinprognostic evaluationandtreatmentof livericirrhosis[J].J Clin Hepatol,2025,41(6):1188-1193.

        汪彥平,鄭亞,張惠芳,等.胰島素樣生長因子-I(IGF-I)在肝硬化預(yù)后評估和治療中的作用[J].臨床肝膽病雜志,2025,41(6):1188-1193.

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