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      細(xì)胞周期蛋白依賴性激酶12:腫瘤治療的潛在靶點(diǎn)

      2021-01-13 00:44:39吳子媚張文歆石煥英陳海飛鐘明康李群益施孝金
      上海醫(yī)藥 2021年23期
      關(guān)鍵詞:激酶基因突變細(xì)胞周期

      吳子媚 張文歆 石煥英 陳海飛 鐘明康 李群益 施孝金

      摘 要 細(xì)胞周期蛋白依賴性激酶12(cyclin-dependent kinase 12, CDK12)參與多種生物學(xué)過程,包括基因轉(zhuǎn)錄、RNA剪接、mRNA翻譯、內(nèi)含子多聚腺苷酸化、表觀遺傳學(xué)修飾和DNA損傷修復(fù)等。在不同類型腫瘤中,CDK12起著原癌基因或腫瘤抑制因子的作用。因此,CDK12被認(rèn)為是腫瘤治療的潛在靶點(diǎn)。近期還有研究顯示,CDK12在腫瘤的免疫調(diào)節(jié)中發(fā)揮著重要作用。本文簡要介紹CDK12的生物學(xué)功能及其在腫瘤治療中的研究進(jìn)展。

      關(guān)鍵詞 細(xì)胞周期蛋白依賴性激酶12 腫瘤 生物標(biāo)志物

      中圖分類號(hào):R730.23; R979.19 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1006-1533(2021)23-0012-04

      基金項(xiàng)目:國家自然科學(xué)基金面上項(xiàng)目(81973399);國家自然科學(xué)基金青年科學(xué)基金項(xiàng)目(82001399);上海市“醫(yī)苑新星”青年醫(yī)學(xué)人才培養(yǎng)資助計(jì)劃——臨床藥師項(xiàng)目;上海市重點(diǎn)臨床??祈?xiàng)目——臨床藥學(xué)項(xiàng)目(shslczdzk06502)

      Cyclin-dependent kinase 12: a potential target in cancer therapy

      WU Zimei, ZHANG Wenxin, SHI Huanying, CHEN Haifei, ZHONG Mingkang, LI Qunyi, SHI Xiaojin

      (Department of Pharmacy, Huashan Hospital, Fudan University, Shanghai 200040, China)

      ABSTRACT Cyclin-dependent kinase 12 (CDK12) engages in diversified biological functions, including gene transcription, RNA splicing, mRNA translation, intron polyadenylation, epigenetic modification and DNA damage repair. As an oncogene or tumor suppressor in different cancers, CDK12 is considered as a potential target for cancer therapy. Recent studies have shown that CDK12 plays an important role in tumor immunity. The biological functions and the research advances of CDK12 in cancer therapy are briefly discussed in this review.

      KEY WORDS cyclin-dependent kinase 12; cancer; biomarker

      細(xì)胞周期蛋白依賴性激酶(cyclin-dependent kinases, CDKs)是一類蛋白絲氨酸/蘇氨酸激酶,在細(xì)胞基因轉(zhuǎn)錄、細(xì)胞周期調(diào)控和神經(jīng)元分化過程中發(fā)揮著重要的作用。CDKs通常被分為兩類:一類主要與細(xì)胞周期控制相關(guān),包括CDK1、CDK2、CDK4和CDK6等;另一類主要與基因轉(zhuǎn)錄相關(guān),包括CDK7、CDK8、CDK9、CDK12和CDK13等[1]。與基因轉(zhuǎn)錄相關(guān)的CDKs通過磷酸化RNA聚合酶Ⅱ的羧基末端結(jié)構(gòu)域(carboxyterminal domain, CTD)和其他靶標(biāo)來調(diào)節(jié)基因轉(zhuǎn)錄。臨床前研究表明,基因轉(zhuǎn)錄抑制可優(yōu)先靶向腫瘤細(xì)胞,部分原因在于腫瘤細(xì)胞較正常細(xì)胞更依賴于高水平的超級(jí)增強(qiáng)子驅(qū)動(dòng)的轉(zhuǎn)錄[2-3]。靶向基因轉(zhuǎn)錄已逐漸成為腫瘤治療領(lǐng)域的一個(gè)研究熱點(diǎn),其中研究最多的兩種基因轉(zhuǎn)錄相關(guān)激酶是CDK7和CDK9。與CDK7類似,CDK12參與細(xì)胞周期和基因轉(zhuǎn)錄的調(diào)控,是腫瘤治療的一個(gè)潛在靶點(diǎn)。近年來,越來越多的證據(jù)表明,CDK12亦可用作一些腫瘤治療的生物標(biāo)志物,且其參與了腫瘤的免疫調(diào)節(jié)。本文簡要介紹CDK12在腫瘤中的生物學(xué)功能及其在腫瘤治療中的研究進(jìn)展。

      CDK12基因定位于17號(hào)染色體長臂1區(qū)2帶,包含14個(gè)外顯子。CDK12由1 490個(gè)氨基酸組成,富含脯氨酸和絲氨酸,是一種典型的剪接因子[4]。CDK12與CDK13有43%的同源序列,它們均含有一個(gè)相對(duì)保守的激酶域。CDK12一般與細(xì)胞周期蛋白K結(jié)合,使RNA聚合酶ⅡCTD中的2和5位絲氨酸磷酸化,進(jìn)而影響基因轉(zhuǎn)錄和其他生物學(xué)過程[5]。研究表明,CDK12的缺失并不影響整體的基因轉(zhuǎn)錄,但會(huì)改變DNA損傷應(yīng)答和DNA復(fù)制相關(guān)基因的一個(gè)子集[5-6]。Blazek等[6]的研究發(fā)現(xiàn),CDK12的缺失主要減少了含有大量外顯子的長基因(>10 kb)的表達(dá),包括那些參與基因組穩(wěn)定性調(diào)控的基因,如乳腺癌易感基因1、共濟(jì)失調(diào)-毛細(xì)血管擴(kuò)張突變的和Rad3相關(guān)的激酶、Fanconi貧血補(bǔ)體組D2等。此外,CDK12激酶域的突變會(huì)抑制DNA雙鏈斷裂的同源重組修復(fù)(homologous recombination repair, HRR)[6-7]。CDK12也參與mRNA的剪接[4],但目前還不清楚其基因選擇性是如何實(shí)現(xiàn)的,以及在這一過程中還有哪些蛋白參與。除參與mRNA剪接外,CDK12還能影響內(nèi)含子多聚腺苷酸化,導(dǎo)致mRNA 3’端加工和表達(dá)受損,進(jìn)而調(diào)節(jié)轉(zhuǎn)錄終止[8]。CDK12在mRNA的翻譯調(diào)節(jié)中亦發(fā)揮著重要作用。在翻譯起始階段,哺乳動(dòng)物雷帕霉素靶蛋白復(fù)合體1(mammalian target of rapamycin complex 1, mTORC1)磷酸化翻譯抑制因子eIF4E結(jié)合蛋白1(eIF4E-binding protein 1, 4E-BP1)的37和46位蘇氨酸,隨后CDK12再磷酸化4E-BP1的65位絲氨酸和70位蘇氨酸[9]。被磷酸化的4E-BP1釋放eIF4E,后者將eIF4G募集到目標(biāo)mRNA的5’端,翻譯啟動(dòng)[10]。Choi等[11]的研究證實(shí),CDK12與mTORC1協(xié)同調(diào)節(jié)中心體、著絲粒、動(dòng)粒復(fù)合物和檢查點(diǎn)激酶1(checkpoint kinase 1, CHK1)的關(guān)鍵亞基的翻譯,這些亞基參與細(xì)胞有絲分裂和細(xì)胞周期調(diào)控。有研究發(fā)現(xiàn),果蠅中CDK12的缺失會(huì)導(dǎo)致異染色質(zhì)蛋白1在常染色質(zhì)區(qū)域的異位積累,最終下調(diào)靶基因的表達(dá)[9]。這表明CDK12可調(diào)控常染色質(zhì)向異染色質(zhì)的轉(zhuǎn)化,而此是CDK12調(diào)控基因表達(dá)的另一種獨(dú)特機(jī)制。

      串聯(lián)重復(fù)是指DNA中的一個(gè)或多個(gè)核苷酸前后相連接的重復(fù)?;蚪M研究發(fā)現(xiàn),某些腫瘤基因組中含有獨(dú)特的串聯(lián)重復(fù)表型[12-14],這種串聯(lián)重復(fù)表型在三陰性乳腺癌、卵巢癌和子宮內(nèi)膜癌中的發(fā)生率高達(dá)50%,在腎上腺皮質(zhì)癌、食管癌、胃癌和肺鱗癌中的發(fā)生率為10% ~ 30%,在其他腫瘤中較少見[15]。有研究發(fā)現(xiàn),CDK12失活的卵巢癌基因組中存在廣泛的局部串聯(lián)重復(fù)(>8 kb),它們分散在基因組的非編碼和編碼區(qū)域中,并在基因密集區(qū)域呈富集態(tài)[16]。目前,這些與CDK12相關(guān)的串聯(lián)重復(fù)的產(chǎn)生機(jī)制在很大程度上仍不清楚。一般來說,細(xì)胞周期調(diào)控相關(guān)的CDKs可通過多重機(jī)制阻止DNA復(fù)制的重新啟動(dòng),故基因組在每個(gè)細(xì)胞周期中只被能復(fù)制1次[17]。在酵母中,如果對(duì)復(fù)制起始蛋白MCM2-7和CDC6的調(diào)控失調(diào),可能啟動(dòng)串聯(lián)重復(fù)形成的初始步驟[18]。研究顯示,CDK12和細(xì)胞周期蛋白K可經(jīng)協(xié)同作用磷酸化細(xì)胞周期蛋白E1,抑制細(xì)胞周期蛋白E1的活性,進(jìn)而促進(jìn)G1期的復(fù)制前復(fù)合體的組裝,而細(xì)胞周期蛋白K或CDK12的敲減則能阻止此復(fù)制前復(fù)合體的組裝[19]。因此,CDK12缺失可能會(huì)最終導(dǎo)致串聯(lián)重復(fù)在細(xì)胞分裂過程中的積累。

      研究表明,>5%的晚期前列腺癌存在CDK12雙等位基因失活或突變[20]。Wu等[21]的研究發(fā)現(xiàn),7%的轉(zhuǎn)移性耐去勢治療前列腺癌(metastatic castration-resistant prostate cancer, mCRPC)患者的CDK12雙等位基因失活。與乳腺癌易感基因2缺失或有錯(cuò)配修復(fù)缺陷的基因組特征不同,CDK12基因突變的腫瘤基因編碼區(qū)中的串聯(lián)重復(fù)會(huì)產(chǎn)生大量的融合基因,后者可能具有抗原的功能。CDK12基因突變的前列腺癌的基因融合負(fù)擔(dān)至少是存在HRR缺陷或共濟(jì)失調(diào)-毛細(xì)血管擴(kuò)張突變的前列腺癌的3倍。與此一致,CDK12基因突變的前列腺癌的T細(xì)胞浸潤總水平和擴(kuò)展的T細(xì)胞克隆數(shù)均高于其他基因組亞型(除錯(cuò)配修復(fù)缺陷外)前列腺癌,且某些趨化因子及其受體的表達(dá)水平也增高[21]。與CDK12基因突變的前列腺癌可能更具免疫原性的推論相符的證據(jù)還有,在4例mCRPC患者中,2例CDK12基因突變的患者對(duì)細(xì)胞程序性死亡受體-1(programmed cell death protein-1, PD-1)抑制劑治療有反應(yīng)[21]。此外,有研究顯示,在乳腺癌中,抑制CDK12可誘導(dǎo)免疫原性細(xì)胞死亡,聯(lián)用PD-1抑制劑后還能增強(qiáng)樹突狀細(xì)胞和T細(xì)胞的浸潤能力[22]。這些數(shù)據(jù)提示,CDK12缺失可能有益于免疫檢查點(diǎn)抑制劑的治療。為驗(yàn)證此推論,臨床上正在進(jìn)行多項(xiàng)相關(guān)試驗(yàn),包括一項(xiàng)伊匹單抗聯(lián)合納武單抗治療CDK12基因突變的轉(zhuǎn)移性腫瘤患者的Ⅱ期研究(NCT03570619)。

      THZ1最初被發(fā)現(xiàn)是一種CDK7抑制劑,后被證實(shí)對(duì)CDK12也有抑制作用[23]。THZ1抑制CDK12的質(zhì)量濃度是抑制CDK7質(zhì)量濃度的3.75倍[24]。THZ531是THZ1衍生物,其對(duì)CDK12的抑制效力是對(duì)CDK7抑制效力的50多倍(半數(shù)抑制質(zhì)量濃度分別為158和8 500 nmol/L)[25]。需指出的是,THZ531可通過上調(diào)三磷酸腺苷結(jié)合轉(zhuǎn)運(yùn)蛋白B超家族成員1和三磷酸腺苷結(jié)合轉(zhuǎn)運(yùn)蛋白G超家族成員2的表達(dá)而實(shí)現(xiàn)藥物外排,這是一種潛在的耐藥機(jī)制[26]。THZ531分別與CDK12、CDK13和CDK7中1 039、1 017和312位的半胱氨酸殘基共價(jià)結(jié)合[26]。靶向1 039位的半胱氨酸殘基意味著具有CDK12選擇性。Gao等[26]還篩選到了沒有THZ531等樣藥物外排作用的化合物E9。Ito等[27]合成并發(fā)現(xiàn)了化合物2,后者能抑制RNA聚合酶ⅡCTD中2位絲氨酸的磷酸化,抑制人類表皮生長因子受體2(human epidermal growth factor receptor 2, HER2)過表達(dá)乳腺癌細(xì)胞的生長[28]。盡管目前已找到幾種有研究價(jià)值的化合物,但至今尚無CDK12抑制劑上市。

      令人驚喜的是,近年來的研究表明,CDK12基因突變或缺失可增強(qiáng)聚(二磷酸腺苷-核糖)聚合酶[poly(ADP-ribose) polymerase, PARP]抑制劑、絡(luò)鉑類藥物、細(xì)胞周期檢查點(diǎn)(如CHK1)抑制劑和免疫檢查點(diǎn)抑制劑的抗腫瘤作用[21, 29-31]。在乳腺癌易感基因突變的三陰性乳腺癌中,腫瘤細(xì)胞DNA存在HRR缺陷,而PARP抑制劑能抑制DNA的損傷修復(fù),進(jìn)而產(chǎn)生合成致死的效應(yīng)[32-33]。但是,腫瘤細(xì)胞可通過未知機(jī)制修復(fù)HRR缺陷,由此表現(xiàn)出對(duì)PARP抑制劑的耐藥[34],而聯(lián)用CDK12抑制劑可克服腫瘤細(xì)胞對(duì)PARP抑制劑的原發(fā)性和獲得性耐藥。此外,CHK1抑制劑能選擇性地殺滅CDK12基因突變或缺失的細(xì)胞,其機(jī)制可能與CDK12本身就具有CHK1調(diào)控作用有關(guān)[31]。CDK12基因突變的卵巢癌細(xì)胞的CHK1表達(dá)減少,而CDK12基因突變細(xì)胞的生存廣泛依賴于殘余CHK1的活性,故這些細(xì)胞對(duì)低劑量CHK1抑制劑敏感[31]。

      對(duì)于myc過表達(dá)的腫瘤,靶向CDK12是一種有前途的治療策略[35],這是因?yàn)椋阂环矫?,CDK12可在myc 3’端募集轉(zhuǎn)錄終止因子來調(diào)節(jié)myc的轉(zhuǎn)錄[36];另一方面,CDK12可增強(qiáng)mTORC1靶基因的翻譯,這些靶基因中包括myc轉(zhuǎn)錄、翻譯所必需的基因[11]。尤文肉瘤患者中最常見的染色體易位是融合蛋白EWS/FLI[37],而CDK12/13抑制劑能以EWS/FLI依賴性方式損害DNA損傷修復(fù),提示CDK12/13抑制劑可治療此類尤文肉瘤患者[38]。HER2過表達(dá)的腫瘤也可能對(duì)CDK12抑制劑敏感[28]。

      CDK12參與多種生物學(xué)過程,包括基因轉(zhuǎn)錄、RNA剪接、mRNA翻譯、內(nèi)含子多聚腺苷酸化和表觀遺傳學(xué)修飾等。抑制CDK12可抑制某些特定腫瘤亞型的腫瘤生長。CDK12已成為腫瘤治療的重要潛在靶點(diǎn)。臨床前研究顯示,在一些腫瘤中,CDK12會(huì)增強(qiáng)腫瘤的免疫調(diào)節(jié),進(jìn)而增強(qiáng)腫瘤對(duì)免疫抑制劑的敏感性。不過,我們目前對(duì)CDK12調(diào)控哪類基因表達(dá)的選擇機(jī)制不甚了解,對(duì)CDK12參與腫瘤免疫調(diào)節(jié)的確切機(jī)制也不清楚。盡管至今還無CDK12抑制劑上市,但隨著對(duì)CDK12在腫瘤中作用的研究的深入,可能會(huì)為腫瘤治療提供一種新的策略。

      參考文獻(xiàn)

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      [4] Ko TK, Kelly E, Pines J. CrkRS: a novel conserved Cdc2-related protein kinase that colocalises with SC35 speckles [J]. J Cell Sci, 2001, 114(Pt 14): 2591-2603.

      [5] Chirackal Manavalan AP, Pilarova K, Kluge M, et al. CDK12 controls G1/S progression by regulating RNAPII processivity at core DNA replication genes [J]. EMBO Rep, 2019, 20(9): e47592.

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