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      腫瘤微環(huán)境中巨噬細(xì)胞及相關(guān)細(xì)胞因子對(duì)肝癌切除術(shù)后患者預(yù)后的影響

      2016-03-17 23:30:08劉立國綜述楊志英審校中日友好醫(yī)院肝膽外科北京100029
      癌癥進(jìn)展 2016年1期
      關(guān)鍵詞:生存率細(xì)胞因子分化

      劉立國 綜述 楊志英審校中日友好醫(yī)院肝膽外科,北京100029

      腫瘤微環(huán)境中巨噬細(xì)胞及相關(guān)細(xì)胞因子對(duì)肝癌切除術(shù)后患者預(yù)后的影響

      劉立國 綜述楊志英#審校
      中日友好醫(yī)院肝膽外科,北京100029

      目前肝切除術(shù)仍是臨床治療肝癌首選的治療方式。但肝切除術(shù)后仍有一定復(fù)發(fā)率。腫瘤微環(huán)境中巨噬細(xì)胞及其相關(guān)細(xì)胞因子能夠影響肝癌細(xì)胞生物學(xué)行為,促進(jìn)肝癌的侵襲和轉(zhuǎn)移,引發(fā)腫瘤復(fù)發(fā)和影響患者預(yù)后。測(cè)定巨噬細(xì)胞及相關(guān)細(xì)胞因子水平對(duì)判斷肝癌肝切除術(shù)后患者的預(yù)后具有重要價(jià)值,同時(shí)巨噬細(xì)胞及相關(guān)細(xì)胞因子也是肝癌治療的潛在靶點(diǎn)。

      肝癌;巨噬細(xì)胞;肝切除術(shù);肝移植;復(fù)發(fā)

      肝癌惡性程度高,預(yù)后差,在男性癌癥相關(guān)死因中位居第2位,在女性中位居第7位[1],肝切除術(shù)和肝移植術(shù)仍是目前肝癌治療的首選治療方法[2]。但肝切除術(shù)后復(fù)發(fā)率較高,約達(dá)70%,肝移植術(shù)后復(fù)發(fā)率也有15%左右。多數(shù)患者腫瘤復(fù)發(fā)后缺乏有效的治療方法,從而導(dǎo)致肝癌總體生存較差。尋找肝癌治療的新靶點(diǎn),延緩腫瘤復(fù)發(fā),延長(zhǎng)患者生存是目前肝癌研究的熱點(diǎn)。肝癌腫瘤微環(huán)境中的炎癥和免疫細(xì)胞在腫瘤的發(fā)生發(fā)展過程中起重要作用。其中腫瘤相關(guān)巨噬細(xì)胞(tumor-associated macrophages,TAM)作為重要的炎癥細(xì)胞,能表達(dá)多種細(xì)胞因子和趨化因子介導(dǎo)免疫反應(yīng),影響肝癌的侵襲和轉(zhuǎn)移。本文對(duì)相關(guān)文獻(xiàn)進(jìn)行綜述。

      1 巨噬細(xì)胞與肝切除術(shù)后復(fù)發(fā)

      1.1巨噬細(xì)胞簡(jiǎn)介

      巨噬細(xì)胞是一種免疫細(xì)胞,自單核細(xì)胞分化而來,其具有多種生物學(xué)功能,如抗原呈遞、器官重塑、炎癥調(diào)節(jié)、免疫誘導(dǎo)等。腫瘤微環(huán)境中的巨噬細(xì)胞能促進(jìn)血管生成、細(xì)胞外基質(zhì)的破壞和重塑,并引發(fā)腫瘤細(xì)胞向血管內(nèi)遷移[3]。多種腫瘤中已證實(shí),腫瘤微環(huán)境中TAM數(shù)量增加者預(yù)后不佳[4]。巨噬細(xì)胞在激活狀態(tài)時(shí),根據(jù)細(xì)胞表面受體和功能特征不同,分為經(jīng)典激活型巨噬細(xì)胞(M1)和選擇性激活型巨噬細(xì)胞(M2)兩種亞型。巨噬細(xì)胞的分化受到不同細(xì)胞因子的調(diào)節(jié),干擾素-γ(interferon γ,IFN-γ)能誘導(dǎo)巨噬細(xì)胞向M1方向分化,白介素4(interleukin 4,IL-4)能誘導(dǎo)巨噬細(xì)胞向M2方向分化。M2具有免疫調(diào)節(jié)作用,能促進(jìn)腫瘤侵襲[5]。

      1.2TAM

      TAM能促進(jìn)肝癌的侵襲和轉(zhuǎn)移,導(dǎo)致肝切除術(shù)后復(fù)發(fā),同時(shí)TAM也具有抑制肝癌侵襲轉(zhuǎn)移的作用。

      肝臟中巨噬細(xì)胞又稱為庫普弗細(xì)胞,該類型細(xì)胞激活后能促進(jìn)肝臟炎癥的發(fā)生,并進(jìn)而促進(jìn)肝癌的發(fā)展。許多研究證實(shí)TAM與肝癌患者術(shù)后預(yù)后相關(guān)。Ding等[6]報(bào)道腫瘤內(nèi)浸潤(rùn)的巨噬細(xì)胞高者術(shù)后生存率和無病生存率均低,其可能機(jī)制為腫瘤內(nèi)巨噬細(xì)胞的表型呈現(xiàn)出IL-10高表達(dá)而人白細(xì)胞抗原DR(human leukocyte antigen DR,HLA-DR)低表達(dá)的狀態(tài),即HLA-DRlow/IL-10high狀態(tài),而該狀態(tài)能夠抑制抗腫瘤免疫,從而促進(jìn)腫瘤進(jìn)展。2013年有研究發(fā)現(xiàn)CD68+巨噬細(xì)胞密度高與患者術(shù)后無病生存率低具有相關(guān)性,而CD163+巨噬細(xì)胞則與患者術(shù)后預(yù)后不相關(guān),僅與肝臟的炎癥程度相關(guān)[7]。2015年Yeung等[8]報(bào)道M2型巨噬細(xì)胞具有促進(jìn)腫瘤血管生成,抑制抗腫瘤免疫等作用,癌旁組織中CD163+M2表達(dá)水平與術(shù)后復(fù)發(fā)相關(guān),同時(shí)與腫瘤多灶和靜脈浸潤(rùn)相關(guān),具體機(jī)制為M2能通過趨化因子CCL22通路和促進(jìn)上皮間質(zhì)轉(zhuǎn)化(epithelial-mesenchymal transition,EMT)而發(fā)揮促腫瘤作用。2014年Zhu等[9]研究發(fā)現(xiàn)癌旁組織中巨噬細(xì)胞和骨橋蛋白均表達(dá)上調(diào)時(shí)腫瘤復(fù)發(fā)時(shí)間縮短。Fan等[10]研究發(fā)現(xiàn)TAM能通過TGF-β1介導(dǎo)的EMT過程促進(jìn)肝癌細(xì)胞朝腫瘤干細(xì)胞方向分化而促進(jìn)腫瘤的遷移、浸潤(rùn)和轉(zhuǎn)移,從而影響患者肝切除術(shù)后的預(yù)后。Wan等[11]研究發(fā)現(xiàn)TAM可通過IL-6/STAT3信號(hào)通路促進(jìn)肝癌腫瘤干細(xì)胞增殖,進(jìn)而促進(jìn)腫瘤生長(zhǎng)。2015年Kang等[12]報(bào)道肝癌腫瘤組織中巨噬細(xì)胞表達(dá)增多與衛(wèi)星灶、血管侵犯、淋巴結(jié)轉(zhuǎn)移等病理指標(biāo)正相關(guān),同時(shí)患者術(shù)后生存期短,且TAM數(shù)目增多的患者共刺激分子B7類似物3(costimulatory molecule B7 homologue 3,B7-H3)表達(dá)上調(diào),進(jìn)一步的細(xì)胞實(shí)驗(yàn)發(fā)現(xiàn)B7-H3能通過介導(dǎo)STAT3信號(hào)通路促進(jìn)人單核細(xì)胞向M2細(xì)胞分化發(fā)揮促腫瘤作用。2014年Fujita等[13]報(bào)道腫瘤相關(guān)巨噬細(xì)胞能夠促進(jìn)腫瘤血管的生成,特別是對(duì)于高分化肝癌作用更為明顯。以上的研究顯示,TAM能夠抑制抗腫瘤免疫、促進(jìn)腫瘤血管生成和影響EMT過程,影響肝癌細(xì)胞的侵襲和轉(zhuǎn)移,進(jìn)而影響患者的預(yù)后,因此可作為肝癌的治療的潛在靶點(diǎn)[14]。TAM既能促進(jìn)肝癌侵襲轉(zhuǎn)移,同時(shí)也具有抑制肝癌侵襲轉(zhuǎn)移的作用。有學(xué)者指出巨噬細(xì)胞在受到不同激活條件影響時(shí),會(huì)出現(xiàn)促進(jìn)腫瘤生長(zhǎng)、抑制宿主免疫和殺傷腫瘤細(xì)胞、維持腫瘤免疫這兩種不同的作用[15]。中國學(xué)者報(bào)道了高水平的瘤內(nèi)浸潤(rùn)TAM是肝切除術(shù)后無病生存率較好的獨(dú)立預(yù)后因素[16]。

      2 巨噬細(xì)胞相關(guān)因子與肝切除術(shù)后復(fù)發(fā)

      2014年Yan等[17]研究發(fā)現(xiàn)巨噬細(xì)胞中T細(xì)胞免疫球蛋白黏蛋白分子3(T cell immunoglobulin and mucin-domain containing protein-3,Tim-3)表達(dá)上調(diào)者肝癌細(xì)胞分化差,并且術(shù)后生存期短,進(jìn)一步的細(xì)胞實(shí)驗(yàn)顯示轉(zhuǎn)化生長(zhǎng)因子β(transforming growth factor,TGF-β)能夠通過上調(diào)Tim-3促進(jìn)TAM轉(zhuǎn)化為M2,M2產(chǎn)生IL-6等細(xì)胞因子促進(jìn)腫瘤生長(zhǎng)和侵襲。2014年Lanaya報(bào)道肝癌腫瘤細(xì)胞中巨噬細(xì)胞表皮生長(zhǎng)因子受體(epidermal growth factorReceptor,EGFR)表達(dá)陽性的患者較EGFR表達(dá)陰性的患者接受肝切除或肝移植術(shù)后總生存率和無病生存率均較低,進(jìn)一步的動(dòng)物實(shí)驗(yàn)表明巨噬細(xì)胞能通過表達(dá)EGFR而促進(jìn)IL-6的分泌來促進(jìn)腫瘤進(jìn)展[18]。巨噬細(xì)胞移動(dòng)抑制因子(macrophage migration inhibitory factor,MIF)是一種由巨噬細(xì)胞、嗜酸性粒細(xì)胞、活化的T細(xì)胞等多種炎癥和免疫相關(guān)細(xì)胞產(chǎn)生的細(xì)胞因子,在機(jī)體炎癥和免疫過程中發(fā)揮著重要作用,同時(shí)也有研究發(fā)現(xiàn)MIF在腫瘤發(fā)生中有重要作用,它能夠控制細(xì)胞增殖、分化、血管生成和腫瘤進(jìn)展[19]。Hira等[20]研究發(fā)現(xiàn)腫瘤內(nèi)MIF表達(dá)水平與腫瘤微血管密度呈正相關(guān),MIF高水平表達(dá)是肝切除術(shù)后無病生存率低的獨(dú)立預(yù)后因素,且認(rèn)為這可能是與MIF調(diào)節(jié)腫瘤血管生成有關(guān)。我國學(xué)者趙一鳴等研究血清中的MIF水平與肝癌切除術(shù)后預(yù)后的關(guān)系時(shí)發(fā)現(xiàn),術(shù)前高水平的血清MIF與患者術(shù)后無病生存率低顯著相關(guān)[21]。2013年Wang等[22]研究發(fā)現(xiàn)肝癌患者血清MIF水平和血管內(nèi)皮生長(zhǎng)因子(vascular endothelial growth factor,VEGF)水平正相關(guān),活化MIF/ VEGF能夠促進(jìn)肝癌的增殖、侵襲、轉(zhuǎn)移。2009年夏金堂等[23]報(bào)道肝癌組織中MIF和Cyclin D1在肝癌組織中過表達(dá)。而后,Huang等[24]研究發(fā)現(xiàn)肝癌組織中MIF的表達(dá)與細(xì)胞周期素D1正相關(guān),并且應(yīng)用MIF敲除的人肝癌細(xì)胞系建立小鼠移植瘤模型,結(jié)果發(fā)現(xiàn)MIF敲除后能抑制生長(zhǎng)相關(guān)因子的表達(dá)和誘導(dǎo)凋亡蛋白的表達(dá),從而抑制腫瘤生長(zhǎng)。巨噬細(xì)胞另一相關(guān)因子是巨噬細(xì)胞集落刺激因子(macrophage colony-stimulating factors,MCSF)。腫瘤發(fā)生過程中MCSF能促進(jìn)巨噬細(xì)胞浸潤(rùn),導(dǎo)致腫瘤血管形成。有學(xué)者報(bào)道腫瘤旁肝臟組織中MCSF高水平表達(dá)是影響患者術(shù)后無病生存率的不良預(yù)后因素[25]。此外,動(dòng)物實(shí)驗(yàn)表明MCSF-1能通過和巨噬細(xì)胞集落刺激因子受體(macrophage colony-stimulating factor-1Receptor,MCSF-1R)結(jié)合,引發(fā)巨噬細(xì)胞的促腫瘤生長(zhǎng)作用,影響患者預(yù)后[26]。Jia等[27]研究發(fā)現(xiàn),瘤旁組織中MCSF-1R高表達(dá)水平的患者,術(shù)后復(fù)發(fā)率高,生存期短。由此可見巨噬細(xì)胞相關(guān)因子能通過調(diào)節(jié)腫瘤血管生成,參與凋亡,發(fā)揮促進(jìn)肝癌侵襲轉(zhuǎn)移,影響患者術(shù)后復(fù)發(fā)的作用。

      總之,巨噬細(xì)胞和相關(guān)細(xì)胞因子能夠影響肝癌細(xì)胞生物學(xué)行為,從而促進(jìn)肝癌的侵襲和轉(zhuǎn)移。測(cè)定巨噬細(xì)胞及相關(guān)因子水平對(duì)判斷肝癌肝切除術(shù)后患者的預(yù)后具有重要價(jià)值,同時(shí)也是肝癌治療的潛在靶點(diǎn)。這也需要更多臨床和基礎(chǔ)研究來進(jìn)一步證實(shí)這些免疫指標(biāo)的有效性。

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      R735.7

      A

      10.11877/j.issn.1672-1535.2016.14.01.09

      (corresponding author),郵箱:yangzhy@aliyun.com

      2015-07-05)

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