溫時媛,姜苗苗
(天津中醫(yī)藥大學(xué)天津市現(xiàn)代中藥重點實驗室,天津300193)
腫瘤代謝靶點用于癌癥治療的研究進展
溫時媛,姜苗苗
(天津中醫(yī)藥大學(xué)天津市現(xiàn)代中藥重點實驗室,天津300193)
腫瘤細胞可以改變糖酵解和谷氨酰胺代謝等代謝途徑,產(chǎn)生其快速增殖所需的原料,從而使自身增殖和生存。因此,研究腫瘤代謝途徑的改變,有利于找到治療癌癥疾病的靶點。本文綜述了腫瘤細胞中有氧糖酵解、谷氨酰胺代謝、三羧酸循環(huán)和合成代謝的代謝特征,并詳細介紹了這些代謝途徑中用于癌癥治療的代謝靶點和相應(yīng)的治療藥物,探討了可以成為癌癥治療靶點的潛在標志物和腫瘤代謝靶向治療所面臨的挑戰(zhàn)。
腫瘤代謝;有氧糖酵解;谷氨酰胺
過去,癌癥的治療方式主要是采用具有細胞毒作用的藥物,但其對正常細胞組織也有損傷。過去的幾十年,研究重點主要集中在通過識別腫瘤細胞的獨特特征更精準地鎖定腫瘤細胞,于是產(chǎn)生了更高效的靶向治療且改善了患者的預(yù)后。近年來的研究致力于利用腫瘤細胞的代謝特征來區(qū)別正常細胞。癌細胞能快速持久地生長、增殖并耐缺氧,基于這些特征尋找不同于正常細胞代謝特征的代謝途徑。研究腫瘤代謝途徑的主要目的是使癌細胞在治療窗內(nèi)被抑制而正常細胞不受影響。
癌癥是一種復(fù)雜的疾病,不同類型的癌癥存在較大的差異,同一類型癌癥不同患者間也存在較大的差異,甚至同一個腫瘤中不同癌細胞間也有差異性。腫瘤代謝也表現(xiàn)了相當大的區(qū)別,腫瘤在不同微環(huán)境中采取不同的代謝途徑。然而,腫瘤某些重要部位的代謝也存在一些共性。腫瘤代謝的共同特征包括葡萄糖、谷氨酰胺和線粒體代謝中的變化,這些共同特征或許可以成為治療癌癥的新的發(fā)展方向。某些代謝途徑的基本性質(zhì)提供了一個統(tǒng)一的研究方向,以避免和克服腫瘤的遺傳差異性。
葡萄糖首先在不需氧的情況下分解為丙酮酸,然后在線粒體中進行三羧酸(tricarboxylic acid,TCA)循環(huán),產(chǎn)生大量的ATP。然而,20世紀50年代,Warburg[1]報道了腫瘤細胞中葡萄糖分解的丙酮酸在有氧的情況下轉(zhuǎn)變?yōu)槿樗?,而不是在線粒體中進行氧化。這種代謝不同于普通模式的代謝。一般認為只有在進行糖酵解時才產(chǎn)生乳酸,而這種代謝類似于克勒勃屈利效應(yīng)(Crabtree effect)。這種效應(yīng)是如果葡萄糖水平很高,即使有氧氣的存在,呼吸也會被抑制。所以Warburg認為,這是腫瘤細胞有氧呼吸的代謝特點,并猜測這種情況是由于癌細胞的線粒體存在缺陷,而導(dǎo)致其自身不能利用氧進行代謝。迄今,發(fā)現(xiàn)大部分腫瘤細胞的線粒體是完整的,大量的致癌基因突變導(dǎo)致腫瘤細胞代謝由氧化磷酸化轉(zhuǎn)變?yōu)樘墙徒猓?]。這種轉(zhuǎn)變的原因依然不清楚,但一致認為葡萄糖的糖酵解使腫瘤細胞產(chǎn)生了一種利于其生長和增殖的生物中間體,同時也避免了氧化磷酸化產(chǎn)生有害的活性氧簇。
Warburg的腫瘤細胞有氧糖酵解的研究發(fā)現(xiàn)了一些值得深思的問題。如腫瘤細胞對這種有氧糖酵解代謝的依賴程度,抑制這種有氧糖酵解是否可以減少腫瘤細胞的增殖。腫瘤細胞利用葡萄糖及其衍生物的代謝途徑,產(chǎn)生其生物合成所需的原料,維持良好的氧化還原環(huán)境,滿足其所需的能量。重要的核心代謝途徑幾乎存在于所有細胞中,所以研究腫瘤細胞代謝的特異性和正常細胞的毒性顯得至關(guān)重要。
糖酵解過程會產(chǎn)生大量相關(guān)的蛋白質(zhì),它們被認為是潛在的藥物靶點。糖酵解的早期階段,葡萄糖被攜帶進入癌細胞并在細胞中被磷酸化;糖酵解的后期階段,葡萄糖轉(zhuǎn)變?yōu)楸岵⒁砸阴]o酶A的形式進入TCA循環(huán)或轉(zhuǎn)變?yōu)槿樗嵋瞥黾毎?。糖酵解的?步是葡萄糖轉(zhuǎn)運體將葡萄糖轉(zhuǎn)運至細胞內(nèi),隨后被己糖激酶磷酸化。在許多類型的癌癥中,葡萄糖轉(zhuǎn)運體和己糖激酶的各種亞型會過度表達[3],它們可以成為藥物抑制的靶點[4]。在B細胞急性淋巴細胞白血病小鼠模型中,葡萄糖轉(zhuǎn)運蛋白1(glucose transporter 1,Glut1)基因的缺失大大減緩了細胞增殖并減輕了疾病[5]。同樣地,在一些癌癥疾病中,將Glut作為抑制對象進行研究。例如,抑制小分子Glut1可以減緩非小細胞肺癌的增長[6],對腎癌也有效[2]。一些抑制逆轉(zhuǎn)錄病毒蛋白酶的藥物,通常用于治療HIV感染,但也發(fā)現(xiàn)其具有抑制Glut1和Glut4的作用[7]。利托那韋就是其中的一種,在多發(fā)性骨髓瘤小鼠模型中,可抑制葡萄糖進入細胞從而具有抗增殖作用[8]。想要將Glut1作為人類癌癥患者的治療靶點,就必須了解其毒性作用。例如,Glut1在血腦屏障中大量表達,所以將Glut1基因抑制后可能影響腦部神經(jīng),即Glut1缺陷綜合征[9]。盡管如此,根據(jù)Glut1抑制劑的臨床跟蹤記錄也說明存在一些具有療效的葡萄糖攝取抑制劑,如利托那韋。
在腫瘤代謝中,選擇性抑制己糖激酶亞型或許也可成為一個治療靶點。很多研究表明,己糖激酶Ⅱ在幾種不同類型的腫瘤細胞中過度表達,而在大部分正常細胞中不表達。己糖激酶Ⅱ基因缺陷是有益的,能減緩癌癥進展,減少癌細胞存活率,如肺癌、乳腺癌[10]和腦癌[11]。有趣的是,己糖激酶Ⅱ基因片段缺失雖然是早期致死因子,但將其全基因敲除的成年小鼠卻能很好地耐受[10-11],說明癌細胞可能選擇性地依賴這種基因片段,所以己糖激酶Ⅱ可以成為一個很好的治療靶點。已經(jīng)證明己糖激酶的小分子抑制物在體外具有抗癌活性[12],如2-脫氧葡萄糖(2-deoxyglucose,2-DG),不過2-DG在體內(nèi)作為單劑量使用時效果一般[5]。然而,對于一個獨特的己糖激酶亞型來說,這類化合物不具有特異性,而抑制癌癥中己糖激酶亞型過度表達的小分子物質(zhì),可以通過不斷改變或許具有特異性。
糖酵解中重要的一步是6-磷酸果糖激酶1(6-phosphofructo-1-kinase,PFK1)將果糖-6-磷酸轉(zhuǎn)變?yōu)楣?1,6-二磷酸。在糖酵解中,這是必需的一步,在多種癌癥類型中,由于PFK1的活性增強,使得大量的葡萄糖進入糖酵解[13]。腫瘤細胞中增強PFK1活性的機制依賴于PFK1變構(gòu)激活因子的生成。致瘤信號增強了PFK2亞型FB3(6-phospho?fructo-2-kinase/fructose-2,6-bisphosphatase-3,PFKFB3)[14],它在許多惡性腫瘤中高表達,是多種腫瘤細胞存活的必需因子,受到缺氧誘導(dǎo)因子1α亞型(hypoxia-inducible factor-1α,HIF-1α)、蛋白激酶B(protein kinase B,Akt)和人第10號染色體缺失的磷酸酶的調(diào)節(jié)[15]。通過對HIF-1α的調(diào)節(jié),降低其在腫瘤細胞中的表達,弱化HIF-1α對腫瘤細胞糖酵解的增強作用,從而減少腫瘤細胞的能量攝入,降低腫瘤細胞轉(zhuǎn)移能力[16]。PFKFB3表達的增強導(dǎo)致產(chǎn)生了果糖-2,6-二磷酸,它是一種PFK1變構(gòu)激活因子[17]。研究表明,PFKFB3抑制劑利用遺傳途徑[18]和小分子抑制劑[19]來減少腫瘤細胞糖酵解并減緩腫瘤細胞生長。PFKFB3小分子抑制劑目前正處于臨床試驗的早期階段[20]。
葡萄糖代謝中另一個關(guān)鍵是糖酵解生成的丙酮酸具有不同代謝途徑,一種是被轉(zhuǎn)運至線粒體內(nèi)進行TCA循環(huán),一種是在胞液中轉(zhuǎn)變?yōu)槿樗?。丙酮酸脫氫酶(pyruvate dehydrogenase,PDH)是丙酮酸的關(guān)鍵調(diào)節(jié)劑,在線粒體中將丙酮酸轉(zhuǎn)變?yōu)橐阴]o酶A。PDH活性的重要調(diào)節(jié)劑是PDH激酶(pyru?vate dehydrogenase kinase,PDK),通過促使PDH特定絲氨酸位點的磷酸化促使PDH失活[21],導(dǎo)致丙酮酸進入線粒體的量減少,而生成大量的乳酸[22]。一些PDK的亞型在各種腫瘤細胞中過度表達[23],并且對維持腫瘤有氧糖酵解起到重要作用。大量研究表明,RNA干擾(RNAi)或小分子抑制劑二氯乙酸(dichloroacetate,DCA)通過抑制PDK抑制劑可使體外腫瘤細胞死亡,也可改善疾病的體內(nèi)模型[24-25]。DCA可以改變腫瘤細胞的能量平衡,促進葡萄糖氧化并由此產(chǎn)生活性氧[24-25]。臨床上,DCA用于治療乳酸性酸中毒[26],并且一些臨床試驗將其作為抗癌劑進行研究。在一個小的臨床試驗中,一些患者采用DCA治療,發(fā)現(xiàn)其與多形性成膠質(zhì)細胞瘤的影像學(xué)回歸有關(guān),減少癌細胞增殖,增加癌細胞凋亡[41]。然而,仍不清楚DCA顯著的抗癌活性是否使小鼠腫瘤模型的代謝正?;?4-27]。
乳酸脫氫酶(lactate dehydrogenase,LDH)是丙酮酸的另一重要調(diào)節(jié)劑,在各種類型癌癥中LDH的表達增多和活性增強,在胞液中將丙酮酸轉(zhuǎn)變?yōu)槿樗幔?8-29]。LDH的2種亞型形成了混合組成的四聚體[28],LDHa亞型在癌細胞中常牽涉有氧糖酵解[28-29],且對丙酮酸有最佳親和力,對酶的活性有最高的Vmax。所以,LDHa能夠迅速將丙酮酸轉(zhuǎn)為乳酸而完成有氧糖酵解。LDHa催化煙酰胺腺嘌呤二核苷酸((nicotinamide adenine dinucleotide,NAD+)產(chǎn)生的反應(yīng),NAD+是維持糖酵解途徑中酶活性的關(guān)鍵,如3-磷酸甘油醛脫氫酶。NAD+也是維持腫瘤細胞中良好氧化還原環(huán)境的關(guān)鍵。小分子抑制劑或遺傳方式抑制LDHa,可以減緩多種腫瘤細胞生長,增加凋亡,包括肝癌和乳腺癌[30-31]。一些早期臨床試驗評價了LDH的非特異性抑制劑,觀察結(jié)果不一[32]。對LDHa具有更高特異性的抑制劑的臨床前開發(fā)目前正在研究中[33]。
腫瘤細胞除了改變葡萄糖代謝,還增加對谷氨酰胺的使用和依賴,以利于腫瘤細胞生長和生存。谷氨酰胺的急劇增加與腫瘤中致癌基因c-Myc信號相關(guān)的一種代謝有關(guān)[34],也與其他的致癌基因突變有關(guān),如致癌基因K-ras[35]。谷氨酰胺代謝的第一步是谷氨酰胺通過轉(zhuǎn)運體進入細胞,這種能夠攜帶谷氨酰胺的轉(zhuǎn)運體在惡性腫瘤中被普遍上調(diào),如SLC1A5(ASCT2)〔中性氨基酸轉(zhuǎn)運蛋白B(0)/ ASC氨基酸轉(zhuǎn)運蛋白2〕和LAT1(大分子中性氨基酸轉(zhuǎn)運蛋白)。在胞漿內(nèi),谷氨酰胺可以作為蛋白質(zhì)、嘌呤和嘧啶從頭合成的一種底物[36],或者可以被谷氨酰胺酶(glutaminases,GLS)轉(zhuǎn)變?yōu)楣劝彼帷D[瘤細胞可以利用谷氨酰胺衍生后的谷氨酸進行各種活動[37]。腫瘤細胞通過谷氨酰胺還原代謝增加乙酰輔酶A生成,通過HIF-1上調(diào)脂肪酸合成酶表達,這都利于脂肪酸的大量合成,脂肪酸一方面合成磷脂利于細胞膜構(gòu)筑,另一方面合成甘油三酯利于能量的儲存和信號的傳導(dǎo),這都與腫瘤形成及進展密切相關(guān)[39]。HIF-1和c-Myc協(xié)同作用可使腫瘤細胞蛋白合成、細胞周期進程和代謝程序重組,從而精細地調(diào)控腫瘤細胞在低氧環(huán)境下的代謝適應(yīng)性反應(yīng)[39]。谷氨酸經(jīng)轉(zhuǎn)氨基作用生成非必需氨基酸,利于腫瘤細胞的生長和增殖,并且在腫瘤細胞TCA中是碳供體,經(jīng)谷氨酸脫氫酶(glutamate dehydrogenase,GDH)轉(zhuǎn)化為α-酮戊二酸而再回流到TCA中,它在TCA循環(huán)中用來支持氧化磷酸化,脂類生成或補充的關(guān)鍵中間體。谷氨酸在細胞中還可以被用于生成還原劑,被轉(zhuǎn)化為還原型谷胱甘肽或在蘋果酸酶作用下生成還原型煙酰胺腺嘌呤二核苷酸磷酸(nicotinamide adenine dinucleo?tide phosphate,NADPH)。腫瘤細胞依賴谷氨酰胺可能是基于癌基因激活及抑癌基因失活[40],如Ras基因通過轉(zhuǎn)錄調(diào)節(jié)天冬氨酸轉(zhuǎn)氨酶催化谷氨酰胺來源的底物的轉(zhuǎn)氨基作用,回補三羧酸中間代謝物,提供代謝大分子原料[41]。
一些癌癥對谷氨酰胺代謝的依賴性提供了其治療方向。研究者們開始尋找谷氨酰胺轉(zhuǎn)運體的抑制劑,限制谷氨酰胺進入腫瘤細胞。小分子抑制劑2-氨基-(2,2,1)-庚基-2-羧酸可以抑制LAT1活性,用其對腫瘤細胞進行治療或者LAT1基因敲除都可以減緩腫瘤細胞的增殖和腫瘤的生長[42-43]。RNAi或者小分子L-谷氨酰基-4-硝基苯胺抑制ASCT2活性,可以減弱哺乳動物西羅莫司(雷帕霉素)靶蛋白〔mammalian target of sirolimus(rapamycin),mTOR〕信號通路并誘導(dǎo)腫瘤細胞自我吞噬[44]。另一研究表明,抑制ASCT2可以降低肺癌細胞某些亞型的生長和存活率,這主要是由于降低了mTOR信號通路的活性[45]。在谷氨酰胺代謝中另一個有效的治療靶點是GLS,GLS有很多小分子抑制劑,其中BPTES在一些癌細胞系中就能成功抑制GLS活性,從而減緩癌細胞生長,促進癌細胞凋亡[46]。還可以通過抑制GDH來阻止谷氨酰胺進入TCA循環(huán),到目前為止仍未發(fā)現(xiàn)抑制GDH的特異性小分子[37]。不過,GDH的非特異性抑制劑對腫瘤細胞具有毒性并且可以減緩移植瘤的生長[47]。
近年來發(fā)現(xiàn),腫瘤細胞的增殖和生存除了利用有氧糖酵解和谷氨酰胺代謝外,一些腫瘤細胞還會很大程度地改變正常的TCA循環(huán)。TCA循環(huán)通常被認為用于支持線粒體氧化反應(yīng),但它還被用于細胞的增殖。在TCA循環(huán)中,乙酰輔酶A產(chǎn)生的檸檬酸被轉(zhuǎn)運出線粒體,然后轉(zhuǎn)變?yōu)楹铣芍舅崴璧脑?,脂肪酸是細胞增殖不可或缺的。TCA循環(huán)在還原羧基化反應(yīng)中被逆轉(zhuǎn),使α-酮戊二酸轉(zhuǎn)變?yōu)楫悪幟仕?,然后再轉(zhuǎn)變?yōu)橹|(zhì)合成所需的檸檬酸。TCA循環(huán)中的某些酶導(dǎo)致腫瘤的突變和發(fā)展。迄今,某些突變發(fā)生在TCA循環(huán)酶上,包括琥珀酸脫氫酶(succinate dehydrogenase,SDH)、延胡索酸水合酶(fumarate hydratase,F(xiàn)H)和異檸檬酸脫氫酶(isocitrate dehydrogenase,IDH)。SDH和FH被認為是腫瘤抑制劑,這2種酶的突變會導(dǎo)致肉瘤、腎癌或者其他類型的癌癥[48-50]。研究表明,在膠質(zhì)瘤[51]和急性粒細胞白血?。?2]及其他癌癥[53-54]中存在
IDH突變。這些突變導(dǎo)致IDH生成一種名叫(R)-2-羥基戊二酸的新代謝物,其在體外可以改變細胞的生存[55],不過機制仍不清楚。許多研究表明,2-羥基戊二酸在細胞中可以庇護IDH突變,并且可以抑制甲基化酶,導(dǎo)致甲基化DNA和干細胞的保留[55-56]。
TCA循環(huán)中特異性小分子是迄今為止治療腫瘤最偉大的發(fā)現(xiàn)之一。小分子抑制劑成功鎖定突變的SDH和FH的能力是有限的,因為這是一種失去了功能的突變。然而,已經(jīng)表明,在臨床前和臨床中一些新化合物可以成功地抑制突變IDH的功能活性。在臨床前研究中,突變IDH的小分子抑制劑會嚴重減少2-羥基戊二酸的產(chǎn)生并使腫瘤細胞向一個更正常的表型分化[57-58]。
無論是良性腫瘤還是惡性腫瘤,都必須不斷增殖,不斷產(chǎn)生新的物質(zhì)和能量,這就促使腫瘤中脂質(zhì)、蛋白質(zhì)和核酸的合成途徑不斷加快。磷酸戊糖途徑可以產(chǎn)生5-磷酸核糖和NADPH。NADPH是脂質(zhì)和核酸合成所必需的,也是重要的抗氧化劑。6-磷酸葡萄糖脫氫酶(glucose-6-phosphate dehy?drogenase,G6PD)是磷酸戊糖途徑的限速酶,它的異常過表達會改變小鼠NIH-3T3成纖維細胞[59]。磷酸甘油酸酯變位酶1(phosphoglycerate mutase 1,PGAM1)活性或基因的抑制劑可以減緩腫瘤生長,是由于G6PD抑制3-磷酸甘油酸酯的作用[60]。即便如此,在某些地方,對G6PD活性有影響的基因的缺失很普遍[61]。然而,這些遺傳基因缺陷似乎并沒有增加這些人群的各種腫瘤發(fā)展的風(fēng)險[62]。丙酮酸激酶M2亞型(pyruvate kinase M2 isoform,PKM2)在磷酸戊糖途徑中促進糖分解,激活后可以抑制腫瘤生長[63]。3-磷酸甘油酸酯經(jīng)多步反應(yīng)轉(zhuǎn)變?yōu)榻z氨酸,磷酸甘油酸脫氫酶(phosphoglycerate dehydrogenase,PHGDH)是第一步反應(yīng)的催化劑,它在人類乳腺癌和黑色素瘤中的量增加,這些腫瘤細胞對PHGDH的消耗特別敏感,說明PHGDH有助于某些腫瘤的發(fā)展[64]。PHGDH是新型抗癌藥物開發(fā)的潛在靶點。
mTOR可以感知氨基酸的缺失,進而抑制蛋白質(zhì)的翻譯,激活細胞自噬作用,從而抑制腫瘤細胞增殖[65]。除了谷氨酰胺非必需氨基酸對腫瘤細胞而言是營養(yǎng)缺失的[66-67]。抑制mTOR是抑制腫瘤細胞增殖的一種方式[68]。核苷酸合成的代謝通路在很早以前就被鎖定為抗腫瘤藥物研發(fā)的靶點。因此,抑制葉酸代謝、胸腺嘧啶核苷的合成、脫氧核苷酸的合成和核酸伸長等是人類腫瘤的標準化療方案的一部分[69]。
針對腫瘤代謝中腫瘤治療的代謝靶點研發(fā)了很多藥物或方法,整理如表1。
表1 用于癌癥治療的有前景的代謝靶點
一些不同的致癌因素引起的信號通路與相關(guān)的腫瘤代謝變化有一定的聯(lián)系。致癌基因Ras和BRAF突變與GLUT1增加有關(guān),這使得腫瘤細胞能夠在微環(huán)境中生存[90]。GLUT1增加不僅與致癌基因的表型相關(guān),而且可能成為特定治療干預(yù)中的對惡性腫瘤耐藥的早期標志物[91]。當腫瘤細胞的葡萄糖攝取下降時,它對磷脂酰肌醇3激酶(phos?phoinositide 3-kinase,PI3K)和mTOR產(chǎn)生雙重抑制作用。PI3K在惡性腫瘤中被過度激活,它的表達可以激活受體酪氨酸激酶(receptor tyrosine kinases,RTK),反之也可激活A(yù)kt1和mTOR復(fù)合物1[93]。Akt1按以下方式促進有氧糖酵解:①通過促進GLUT1在質(zhì)膜內(nèi)合成[92];②通過穩(wěn)定己糖激酶2與線粒體酶間的關(guān)系,從而增加酶的活性[93];③通過激活PFKFB3[94]。另外,一些RTK例如ERBB2,在大量的乳腺癌中過度表達,并通過Akt1的依賴性和非依賴性途徑刺激糖酵解,ERBB2尤其促進Akt1非依賴性途徑和熱休克因子1介導(dǎo)的LDHa基因的激活[95]。研究發(fā)現(xiàn),突變的SDH和FH與家族性癌癥和散發(fā)性癌癥有關(guān),是琥珀酸和延胡索酸的積累所致,說明代謝產(chǎn)物可能直接導(dǎo)致腫瘤的發(fā)生[96]。最近的研究證明了這一點,在FH缺陷的小鼠中腎囊腫的形成不需要HIF-1,但卻涉及半胱氨酸殘基的酶改性,它破壞了Kelch樣ECH相關(guān)蛋白1(Keap1)抑制NF-E2相關(guān)因子2(Nrf2)調(diào)控的抗氧化反應(yīng)的能力[97]。
腫瘤代謝中有許多潛在的治療靶點,但將抑制代謝途徑作為臨床治療腫瘤的一種手段仍然存在重大的挑戰(zhàn)。首先是只針對腫瘤細胞有效治療,而對正常細胞沒有抑制作用,尤其是免疫系統(tǒng)中快速增殖的細胞,因為它的代謝途徑類似于腫瘤細胞。如T細胞和B細胞依賴于有氧糖酵解[98-99]和谷氨酰胺代謝[100-101]來維持免疫作用。免疫細胞代謝被抑制會減弱它們抵抗癌細胞的能力,且使患者更易感染。其次是許多腫瘤細胞的代謝具有靈活性。這種代謝的靈活性限制了單一靶向治療的有效性。
細胞代謝是一切生命體的基礎(chǔ),腫瘤細胞為適應(yīng)細胞生長和轉(zhuǎn)移進行自身代謝改變。腫瘤細胞代謝會進行自我調(diào)整,但是腫瘤細胞代謝會形成哪些新的途徑?例如,降低與糖酵解有關(guān)酶的活性,或者控制食物中能量的供給,使腫瘤細胞長期處于一個能量匱乏的微環(huán)境中。有氧糖酵解的描述已經(jīng)證實了腫瘤細胞代謝改變的靶向治療潛力。在過去10年里,已經(jīng)明確了通過改變細胞能量代謝途徑及如何運用這些改變設(shè)計新的治療方案來抵抗疾病。最近研究表明,許多潛在的途徑和靶點會成為腫瘤治療的有價值的目標。每一種腫瘤都有自己特有的代謝途徑,大多數(shù)腫瘤的代謝特點表現(xiàn)為Warburg效應(yīng)。大部分研究都是側(cè)重在糖酵解和谷氨酰胺代謝過程中關(guān)鍵酶和限速酶的靶向治療。TCA循環(huán)中關(guān)鍵酶的研究相對比較少。相信今后將發(fā)現(xiàn)更加有潛力的治療靶點。現(xiàn)仍然存在許多關(guān)于靶向腫瘤代謝的問題,包括代謝抑制劑的非靶向性和免疫細胞的抑制,但或許將代謝抑制劑聯(lián)合應(yīng)用于臨床更有效。
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Research progress in metabolic targets for cancer therapy
WEN Shi-yuan,JIANG Miao-miao
(Tianjin State Key Laboratory of Modern Chinese Medicine,Tianjin University of Traditional Chinese Medicine,Tianjin 300193,China)
Cancer cells can change metabolic pathways,including glycolysis and glutamine metabolism,and produce the raw materials needed for rapid proliferation and survival.Therefore,research on metabolic pathways of cancer cells might help find the targets of cancer therapy.In this review,we outlined the metabolic features of aerobic glycolysis,glutamine metabolism and(tricarboxylic acid) TCA cycle in cancer.We also described metabolic targets for cancer therapy and therapeutic agents for the corresponding targets in these metabolic pathways,and finally discussed some of the challenges related to tumor metabolism as a therapeutic target in cancer therapy.
tumor metabolism;aerobic glycolysis;glutamine
JIANG Miao-miao,E-mail:miaomiaojiang@126.com,Tel:15822829059
2016-07-05接受日期:2017-03-17)
(本文編輯:齊春會)
國家自然科學(xué)基金(81573547)
溫時媛,碩士研究生,主要從事中藥化學(xué)研究,E-mail:13072001326@163.com
姜苗苗,E-mail:miaomiaojiang@126.com,Tel:15822829059
R730.5
:A
:1000-3002-(2017)03-0269-10
10.3867/j.issn.1000-3002.2017.03.011
Foundation item:The project supported by National Natural Science Foundation of China(81573547)