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ASPH在肝臟惡性腫瘤發(fā)生發(fā)展中作用和機(jī)制研究進(jìn)展

2020-04-12 00:00:00鄒怡然王海波李俊沈鋒

[摘要] 天冬氨酰-(天冬酰胺酰)β-羥化酶(ASPH)是α-酮戊二酸依賴性雙加氧酶,催化天冬氨酰和天冬酰胺基殘基的羥化。ASPH在肝細(xì)胞癌和肝內(nèi)膽管癌中均有表達(dá),對二者的發(fā)生和發(fā)展有作用。本文主要對ASPH的結(jié)構(gòu)和功能及其作用機(jī)制的研究進(jìn)展進(jìn)行綜述。

[關(guān)鍵詞] 天冬氨酰-(天冬酰胺酰)β-羥化酶;α酮戊二酸依賴性雙加氧酶FTO;肝腫瘤;受體,Notch;綜述

[中圖分類號(hào)] R345;R735.7 "[文獻(xiàn)標(biāo)志碼] A "[文章編號(hào)] 2096-5532(2020)02-0248-05

doi:10.11712/jms.2096-5532.2020.56.101 [開放科學(xué)(資源服務(wù))標(biāo)識(shí)碼(OSID)]

[網(wǎng)絡(luò)出版] http://kns.cnki.net/kcms/detail/37.1517.R.20200521.1527.002.html;2020-05-22 08:50

[ABSTRACT] Aspartyl-(asparaginyl)-β-hydroxylase (ASPH) is a α-ketoglutarate-dependent dioxygenase and catalyzes the hydroxylation of aspartyl and asparaginyl residues. ASPH is expressed in both hepatocellular carcinoma and intrahepatic cholangiocarcinoma and has an effect on the development and progression of these two diseases. This article reviews the research advances in the structure, function, and mechanism of ASPH.

[KEY WORDS] aspartyl-(asparaginyl)-β-hydroxylase; alpha-ketoglutarate-dependent dioxygenase FTO; liver neoplasms; receptors, Notch; review

原發(fā)性肝癌是世界范圍內(nèi)最常見的癌癥之一,也是癌癥相關(guān)死亡的重要原因[1]。根據(jù)腫瘤組織來源可分為肝細(xì)胞癌(HCC)和肝內(nèi)膽管癌(ICC)[2],一般HCC占70%~85%,ICC占10%~20%[3]。天冬氨酰-(天冬酰胺酰)β-羥化酶(ASPH)是一種高度保守的雙加氧酶,在包括HCC和ICC的多種惡性腫瘤中高表達(dá)[4]。ASPH可以調(diào)控原發(fā)性肝癌的發(fā)生及發(fā)展,可能是疾病藥物及免疫治療研究的新方向。本文簡要綜述了ASPH在HCC和ICC發(fā)生發(fā)展中作用和機(jī)制的研究進(jìn)展。

1 HCC與ICC的診療現(xiàn)狀

1.1 HCC的診療現(xiàn)狀

HCC是全球第五大常見的惡性腫瘤,也是與癌癥相關(guān)死亡的第二大原因[3]。HCC的發(fā)病率隨年齡升高而增高,且男性的發(fā)病率約為女性的2倍[5]。最常見的致病因素是慢性病毒性肝炎(HBV與HCV)、長期飲酒和黃曲霉毒素暴露等[6]。尤其HBV感染,全球大約有60%的HCC病人發(fā)病與之相關(guān)[7]。肝切除(LR)和肝移植(LT)是早期腫瘤病人的首選治療方法,其中LR是臨床應(yīng)用最廣泛的治療手段,符合切除標(biāo)準(zhǔn)的病人接受LR術(shù)后能取得比較滿意的治療效果[8]。但是對于沒有條件接受LR、LT或者化學(xué)栓塞治療的晚期病人,其治療方式的選擇有限。然而令人欣喜的是,索拉菲尼——一種多酪氨酸激酶抑制劑的出現(xiàn)有效延長了晚期肝癌病人的生存期[9-10]。同時(shí),新的分子靶向藥物也不斷被開發(fā)和應(yīng)用:瑞戈非尼——一種口服多激酶抑制劑,作為索拉菲尼耐藥病人的二線用藥已進(jìn)入臨床應(yīng)用[11];樂伐替尼——一種血管內(nèi)皮生長因子受體1~3抑制劑,成纖維細(xì)胞生長因子受體1~4抑制劑,血小板衍生生長因子受體α、轉(zhuǎn)染重排(RET)和KIT的抑制劑,在一項(xiàng)開放性、多中心、非劣效性、隨機(jī)試驗(yàn)中顯示其生存率不低于索拉非尼[12];近期,卡博替尼經(jīng)批準(zhǔn)用于甲狀腺癌和腎癌的血管內(nèi)皮細(xì)胞生長因子受體(VEGFR)2和RET抑制劑,在HCC的二線治療中與安慰劑相比顯示出生存收益[13]。這些新的化療藥物的出現(xiàn),改變了晚期HCC的治療策略,在一定程度上提高了晚期病人的預(yù)后。

1.2 ICC的診療現(xiàn)狀

ICC起源于肝內(nèi)膽管的上皮細(xì)胞,是第二常見的原發(fā)性肝癌[14]。在過去的30年里,ICC的發(fā)病率和與其相關(guān)的死亡率都呈現(xiàn)上升趨勢[15]。其主要危險(xiǎn)因素包括:慢性肝炎(主要為HCV)、肝硬化、膽管炎性疾病、肝膽吸蟲、過量乙醇攝入和肥胖等[16]。ICC發(fā)病于肝內(nèi),病人最初沒有癥狀或只表現(xiàn)非特異癥狀,包括腹痛、食欲不振、體質(zhì)量下降、全身乏力和盜汗等,這種隱匿的發(fā)病特點(diǎn)使ICC的早期診斷困難[17]。ICC具有高度的侵襲性,手術(shù)切除是目前治療ICC的主要手段,并可提高特定病人的生存率[18]。研究普遍認(rèn)為切緣無腫瘤細(xì)胞切除(R0)是手術(shù)治療的金標(biāo)準(zhǔn),并且切緣的陽性病理結(jié)果與預(yù)后不良有著密切的聯(lián)系[19-20]。鑒于以上特點(diǎn),僅30%的病人有接受手術(shù)治療的機(jī)會(huì)[21]。手術(shù)效果也難以令人滿意,術(shù)后5年的無復(fù)發(fā)生存率和總生存率僅為26.1%和33.9%[22-23]。輔助化療可以為晚期或侵襲性ICC病人提供一定的生存收益,但在臨床實(shí)踐中尚缺少有效的靶向治療藥物。近年來針對新輔助治療(NAT)的研究逐漸增多,但因?qū)ζ涫找娲嬖跔幾h并未在臨床推廣應(yīng)用。雖然支持晚期ICC病人應(yīng)用NAT的證據(jù)十分有限,但已經(jīng)有多項(xiàng)研究顯示病人手術(shù)前接受降期治療能夠改善預(yù)后[24-26]。

2 ASPH的結(jié)構(gòu)及功能

ASPH是分子量為8.6萬的Ⅱ型跨膜蛋白,屬于α-酮戊二酸依賴性的雙加氧酶[27-33]。其基因全長含有214 085個(gè)堿基,有33個(gè)外顯子,可編碼4種蛋白質(zhì),即ASPH、Junctin(肌漿網(wǎng)的結(jié)構(gòu)蛋白)、humbug(缺少催化結(jié)構(gòu)域)和Junctate[34-35]。ASPH催化某些蛋白質(zhì)(包括Notch1和Jagged)的表皮生長因子(EGF)樣結(jié)構(gòu)域中的天冬氨酰和天冬酰胺基殘基的羥化[34,36-38],其在一般成人體內(nèi)組織中表達(dá)非常低[39-41],但是其在促進(jìn)細(xì)胞遷移和器官發(fā)育的過程中發(fā)揮一定作用,可在胚胎組織中表達(dá)[27-28]。研究人員在包括肝臟惡性腫瘤、肺癌、乳癌、結(jié)腸癌和神經(jīng)系統(tǒng)惡性腫瘤等的轉(zhuǎn)錄和翻譯水平都觀察到了ASPH的過度表達(dá)[42-43]。ASPH在HCC中過表達(dá)與病人手術(shù)后較高的復(fù)發(fā)率和較低的存活率之間存在顯著關(guān)聯(lián)[41]。盡管在ICC中也觀察到ASPH的過表達(dá),并且提示了ASPH與ICC術(shù)后不良預(yù)后的關(guān)系[44],但ASPH在ICC中的作用機(jī)制的相關(guān)研究較少,還有待進(jìn)一步深入探索。

2.1 ASPH在HCC中的作用機(jī)制

在HCC中存在ASPH過度表達(dá)的現(xiàn)象[45],且ASPH是HCC組織中表達(dá)最高的腫瘤抗原前體蛋白之一[46]。研究表明,與ASPH表達(dá)低的病人比較,ASPH表達(dá)高者腫瘤復(fù)發(fā)率高、生存率低,預(yù)后不良[41]。

ASPH刺激可導(dǎo)致抗原特異性CD4+T細(xì)胞的形成,采用ASPH負(fù)載的樹突狀細(xì)胞免疫可以降低HCC小鼠模型中腫瘤復(fù)發(fā)的風(fēng)險(xiǎn)[47]。在HepG2細(xì)胞中,ASPH的表達(dá)可由胰島素和胰島素樣生長因子1(IGF-1)通過ERK/MAPK和PI3K/AKT信號(hào)通路誘導(dǎo),并被胰島素受體底物1(IRS-1)的過度表達(dá)激活,從而導(dǎo)致HepG2細(xì)胞的運(yùn)動(dòng)性和侵襲性增加;反之,siRNA抑制ASPH表達(dá)可降低HepG2細(xì)胞的運(yùn)動(dòng)性和侵襲性[42]。在轉(zhuǎn)基因小鼠的肝臟中,乙型肝炎X蛋白(HBx)+/IRS-1+雙轉(zhuǎn)基因小鼠肝細(xì)胞不典型增生增加,繼而發(fā)展為HCC,且肝臟中ASPH的mRNA表達(dá)選擇性地增加,進(jìn)一步證明了ASPH的過度表達(dá)與肝細(xì)胞的惡性轉(zhuǎn)化之間存在聯(lián)系[48]。

2.2 ASPH通過Notch信號(hào)通路作用于HCC

Notch信號(hào)通路在HCC細(xì)胞系中起到重要作用,并且Notch信號(hào)通路與ASPH也存在一定的聯(lián)系。Notch信號(hào)級(jí)聯(lián)是一種高度保守的通路,具有多種功能,在胚胎發(fā)育過程中對細(xì)胞信號(hào)傳導(dǎo)和決定細(xì)胞命運(yùn)的控制具有重要作用[49-51]。不僅于此,其在肝臟的生成、修復(fù)和代謝等方面也發(fā)揮著重要作用。哺乳動(dòng)物中存在4種不同的Notch受體(Notch1~4),其應(yīng)答于5種不同的配體(Delta-like 1、3、4和Jagged1、Jagged2)[51]。研究結(jié)果顯示,在多種HCC細(xì)胞系中,Notch受體1、2、3和4以及配體Jagged1均有表達(dá),并且Notch細(xì)胞內(nèi)結(jié)構(gòu)域(NICDs)和活化的Notch2細(xì)胞內(nèi)結(jié)構(gòu)域在部分HCC細(xì)胞系中也有顯著地表達(dá),這一結(jié)果表明Notch信號(hào)通路存在于HCC細(xì)胞系中[52]。研究者已經(jīng)通過計(jì)算機(jī)輔助藥物設(shè)計(jì)并且開發(fā)了ASPH的小分子抑制劑MO-I-1100,通過檢測發(fā)現(xiàn)該化合物能將ASPH的活性降低80%[53-55]。使用該化合物可降低HCC細(xì)胞中下游Notch調(diào)節(jié)的HES1和HEY1基因的表達(dá),成功抑制HCC細(xì)胞的遷移、侵襲和錨定依賴生長[52]。在動(dòng)物模型中,抑制ASPH活性可通過抑制HCC的Notch信號(hào)級(jí)聯(lián)抑制原位和皮下小鼠模型體內(nèi)的HCC的生長,產(chǎn)生抗腫瘤作用 [55]。

2.3 ASPH在ICC中的作用機(jī)制

ASPH高度表達(dá)這一現(xiàn)象在膽管癌中尤為突出,其陽性率gt;95%[43,53]。通過對ICC病人臨床數(shù)據(jù)進(jìn)行分析,發(fā)現(xiàn)ASPH的表達(dá)與腫瘤大小、浸潤性生長方式、侵襲性組織學(xué)分級(jí)和血管侵犯等變量相關(guān),并且ASPH表達(dá)的增加是預(yù)后的危險(xiǎn)因素,提示ASPH在調(diào)節(jié)ICC細(xì)胞侵襲或轉(zhuǎn)移能力方面具有重要作用[44]。在ICC細(xì)胞系中,與高分化分型相比,ASPH在中分化或低分化腫瘤細(xì)胞中的表達(dá)更高,并通過促進(jìn)細(xì)胞運(yùn)動(dòng)的方式促進(jìn)ICC細(xì)胞的浸潤性生長[54]。但是,在人正常增殖膽管細(xì)胞和大鼠非膽管癌模型中,不存在ASPH的過表達(dá)現(xiàn)象,這表明ASPH的過度表達(dá)與膽管上皮細(xì)胞轉(zhuǎn)化為惡性腫瘤細(xì)胞有關(guān)[43]。此外,在大鼠ICC模型中,ASPH負(fù)載樹突狀細(xì)胞的免疫具有抗腫瘤作用,這些樹突狀細(xì)胞在體外對ICC細(xì)胞具有細(xì)胞毒性,抑制了肝內(nèi)腫瘤的生長和轉(zhuǎn)移,并且還與CD3+T細(xì)胞向腫瘤浸潤的增加相關(guān)[55]。這與HCC中CD4+T細(xì)胞向腫瘤浸潤的增加類似卻又有所區(qū)別。

2.4 ASPH通過Notch信號(hào)通路作用于ICC

一些研究表明,Notch信號(hào)通路與ICC的發(fā)生和發(fā)展有關(guān):從機(jī)制上講,Notch信號(hào)級(jí)聯(lián)反應(yīng)的激活與ICC發(fā)生存在關(guān)聯(lián),ASPH過表達(dá)通過Notch1依賴的細(xì)胞周期蛋白D1(Cyclin D1)途徑,促進(jìn)Notch活化和調(diào)控ICC進(jìn)程。Notch下游靶點(diǎn)Cyclin D1在ICC細(xì)胞系中被Notch信號(hào)轉(zhuǎn)錄調(diào)控[56],提示它可能是調(diào)節(jié)細(xì)胞周期的重要效應(yīng)器。有研究者發(fā)現(xiàn)一種新的分子機(jī)制“ASPH-Notch-Cyclin D1”是ICC生長和進(jìn)展的驅(qū)動(dòng)因子,并針對性使用ASPH的小分子抑制劑,成功在體外抑制ICC細(xì)胞的增殖[57]。

3 ASPH的應(yīng)用前景

近年來,ASPH在HCC與ICC的研究中取得重要進(jìn)展,如前所述,針對性開發(fā)的小分子抑制劑在細(xì)胞和動(dòng)物模型中能夠有效抑制腫瘤的生長。與此同時(shí),在其他多種惡性腫瘤的分子靶向治療研究中,ASPH也展示出一定的開發(fā)價(jià)值:ASPH小分子抑制劑MO-I-1100除了能夠抑制HCC,還在前列腺癌的研究中也展示出相似的腫瘤抑制效果[53]。在針對多形性膠質(zhì)母細(xì)胞瘤(GBM)的研究中,ASPH小分子抑制劑MO-I-1100和MO-I-1151能夠顯著降低GBM細(xì)胞的存活率和定向運(yùn)動(dòng)能力[58]。在乳癌中,以ASPH為靶點(diǎn)的人單克隆抗體(mAb)PAN-622在腫瘤細(xì)胞表面的放射性標(biāo)記是一種全新的顯像方法,并且有可能用于轉(zhuǎn)移性乳癌的治療[59]。

4 結(jié)語

越來越多的研究已關(guān)注到,ASPH在原發(fā)性肝癌的發(fā)生和發(fā)展過程中發(fā)揮著重要的作用。ASPH在HCC和ICC組織中的表達(dá)較正常組織都是升高的,無論是何種組織類型來源,ASPH在腫瘤組織中的高表達(dá)都與病人的不良預(yù)后存在關(guān)聯(lián),說明圍繞ASPH機(jī)制進(jìn)一步深入研究在臨床應(yīng)用上有巨大前景和重要意義。從機(jī)制上看,ASPH在Notch通路中的調(diào)控作用在兩種主要原發(fā)性肝癌中均有所體現(xiàn),且針對Notch通路的ASPH小分子抑制劑能夠在動(dòng)物模型中抑制腫瘤的增殖和轉(zhuǎn)移,提示了一個(gè)新的靶向治療的研究方向和思路。

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(本文編輯 于國藝)

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