姚 麗,鞏 麗,朱少君,韓秀娟,蘭 淼,張 偉 (第四軍醫(yī)大學(xué)唐都醫(yī)院病理科,陜西西安710038)
·檢驗與轉(zhuǎn)化醫(yī)學(xué)·
肺癌與HPV感染相關(guān)性的初步研究
姚 麗,鞏 麗,朱少君,韓秀娟,蘭 淼,張 偉 (第四軍醫(yī)大學(xué)唐都醫(yī)院病理科,陜西西安710038)
目的:應(yīng)用液相芯片技術(shù)分析肺癌患者與HPV感染的相關(guān)性.方法:重組質(zhì)粒表達(dá)HPV16 E6和E7蛋白,同微球偶聯(lián)后作為抗原,應(yīng)用Luminex系統(tǒng)檢測肺癌患者血清中的相應(yīng)抗體.結(jié)果:肺癌組HPV16 E6/E7抗體水平顯著高于正常對照組,肺鱗狀細(xì)胞癌與腺癌腫瘤組對比,肺鱗狀細(xì)胞癌HPV16 E6/E7抗體陽性率顯著高于肺腺癌組,差異具有統(tǒng)計學(xué)意義(P<0.05).結(jié)論:HPV感染與肺鱗狀細(xì)胞癌具有一定的相關(guān)性,為進一步研究肺鱗狀細(xì)胞癌發(fā)生的分子機制提供了依據(jù).
肺癌;HPV;液相芯片
肺癌從組織學(xué)上分為小細(xì)胞肺癌和非小細(xì)胞肺癌[1],而非小細(xì)胞肺癌主要包括鱗狀細(xì)胞癌和腺癌.人乳頭瘤病毒(human papillomavirus,HPV)病毒為DNA病毒,通常感染人體特定部位的皮膚和粘膜的基底細(xì)胞.根據(jù)其與人類腫瘤的關(guān)系,HPV可分為高危型(HPV16,HPV18,HPV31,HPV33,HPV35)、中危型(HPV31,HPV33,HPV35)和低危型(HPV6,HPV11)[2-3].眾所周知 HPV感染可以導(dǎo)致宮頸癌,HPV感染與陰道、肛門和陰莖癌等外陰部癌癥的發(fā)生存在明顯的相關(guān)性[4].本研究應(yīng)用高通量的Luminex 100 液相芯片技術(shù)檢測肺癌與HPV病毒感染的關(guān)系以及相關(guān)的HPV類型,為肺癌的預(yù)測及預(yù)防提供理論基礎(chǔ)及臨床方法,現(xiàn)報道如下.
1.1 實驗標(biāo)本患者血清標(biāo)本選自唐都醫(yī)院,經(jīng)臨床及病理診斷為肺癌的患者82例,正常對照血清選自健康獻(xiàn)血者67例.
1.2 主要試劑酪蛋白及谷胱甘肽購自sigma公司,蛋白酶抑制劑購自Roche公司,CBSK及濾膜板均購自millipore公司,鏈霉素標(biāo)記的藻紅蛋白購自Invitrogen公司,其他試劑均為進口分析純.pGEX?HPV16?tag質(zhì)粒由本實驗室保存.
1.3 方法
1.3.1 高度危險型HPV16 E6和E7蛋白表達(dá) 質(zhì)粒pGEX?GST?HPV16 E6/E7?tag電轉(zhuǎn)化 E.coli BL21(DE3),挑單克隆的菌落,在含有氨芐霉素的5 mL LB中37℃震蕩培養(yǎng)12 h,然后接種于60 mL LB中,37℃震蕩過夜,加入 350 mL LB,當(dāng)室溫培養(yǎng)至OD600=0.5時,加IPTG誘導(dǎo)劑誘導(dǎo)蛋白表達(dá)6 h,離心收集菌體,重懸于PBS,超聲裂解,14000 rpm離心,收集上清液.用Bradford法測量蛋白濃度.
1.3.2 G?C微球包被HPV16 E6/E7蛋白及純化1 mg/mL含GST?HPV16 E6/E7?tag蛋白的菌體裂解液加適量的G?C微球,室溫避光搖床孵育1 h,阻斷緩沖液洗滌3次,其他的菌液雜蛋白由于不含有GST蛋白無法與G?C微球結(jié)合,故通過洗滌過程被清除,加適量阻斷緩沖液重懸.
1.3.3 血清檢測 血清1∶50孵育于阻斷緩沖液,室溫1 h.濾膜96孔板加50 μL HPV16 E6/E7蛋白包被的G?C微球和50 μL孵育后的血清,室溫1 h,真空泵阻斷緩沖液洗滌3次,1∶1000生物素標(biāo)記的羊抗人IgG100 μL,室溫1 h,洗滌3次,1∶1000鏈霉素標(biāo)記的藻紅蛋白100 μL,室溫1 h,洗滌3次,100 μL阻斷緩沖液重懸,Luminex系統(tǒng)檢測MFI.
1.4 統(tǒng)計學(xué)處理采用SPSS17.0統(tǒng)計學(xué)軟件進行數(shù)據(jù)分析,行t檢驗,P<0.05表示差異有統(tǒng)計學(xué)意義.
2.1 應(yīng)用Luminex系統(tǒng)檢測肺癌患者及正常對照血清中HPV16 E6/E7抗體Luminex系統(tǒng)檢測的優(yōu)點在于不同的微球具有不同的光譜,能夠被單獨識別,故本次實驗應(yīng)用兩種微球分別包被兩種HPV抗原(HPV16 E6和E7蛋白),置于1個反應(yīng)體系中同時檢測1份血清中的HPV16的兩種抗體.結(jié)果顯示,肺癌組HPV16 E6/E7抗體水平顯著高于正常對照組(圖1).
圖1 肺癌患者及正常對照血清中HPV16抗體檢測結(jié)果
2.2 應(yīng)用Luminex系統(tǒng)檢測肺鱗狀細(xì)胞癌及肺腺癌患者血清中HPV16 E6/E7抗體選取肺癌患者82例作為研究對象,其中肺鱗狀細(xì)胞癌患者50例,肺腺癌患者32例,通過Luminex系統(tǒng)檢測肺鱗狀細(xì)胞癌及肺腺癌患者血清中HPV16 E6/E7抗體,結(jié)果顯示,肺鱗狀細(xì)胞癌患者血清中HPV16 E6/E7抗體陽性率顯著高于肺腺癌組,差異具有統(tǒng)計學(xué)意義(P<0.05).
表1 肺鱗狀細(xì)胞癌及肺腺癌患者血清中HPV16抗體水平檢測
1979年,Syrj?nen[5]首次在肺癌中觀察到 HPV感染病灶的形態(tài)學(xué)改變.隨后,不同的研究機構(gòu)應(yīng)用不同方法檢測肺癌組織中是否含有HPV DNA,如斑點印記、原位雜交、Sourthern bolt及PCR法[6-7].但由于方法的不同及實驗室之間的差異,不同的個案報道中,HPV DNA的檢出率相差很大[8].肺癌從組織學(xué)上分為小細(xì)胞肺癌和非小細(xì)胞肺癌[9],而非小細(xì)胞肺癌又包括鱗狀細(xì)胞癌和腺癌[10].肺鱗狀細(xì)胞癌通常的發(fā)病模式為在各種因素作用下支氣管的纖毛柱狀上皮鱗狀上皮化生,然后經(jīng)過不同階段的不典型增生,最后癌變形成鱗狀細(xì)胞癌[11-12].這個過程同HPV易感染宮頸的鱗柱交界處有相似之處.HPV病毒含有兩個主控轉(zhuǎn)化過程的原癌基因:E6和E7[13],其蛋白的抗體在健康人群中少有發(fā)現(xiàn),只同浸潤性癌高度相關(guān),具有很好的特異性和敏感性,這可能是因為在初次感染和隱性感染中HPV病毒E6和E7蛋白表達(dá)的量少或未接觸到免疫系統(tǒng)[3,14].
本研究應(yīng)用高通量Luminex系統(tǒng)檢測肺癌患者血清中的HPV16抗體,結(jié)果顯示,與正常健康人群血清相比,肺癌患者血清中HPV16抗體水平明顯增高,并且肺鱗狀細(xì)胞癌患者血清HPV16抗體陽性率高于腺癌患者,這提示HPV可能參與肺鱗狀細(xì)胞癌的癌變過程,為肺鱗狀細(xì)胞癌的預(yù)防、診斷和治療提供了新的思路和靶點.
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Primary study on the correlation between lung cancer and HPV infection
YAO Li,GONG Li,ZHU Shao?Jun,HAN Xiu?Juan,LAN Miao,ZHANG Wei
Department of Pathology,Tangdu Hospital,F(xiàn)ourth Military Medi?cal University,Xi'an 710038,China
AIM:To analyze the correlation between lung cancer and HPV infection by Luminex technology.METHODS:HPV16 E6/E7 proteins binding to microparticle were expressed with recombinant plasmid.The corresponding antibodies in serum of patient with lung cancer were detected by Luminex technology.RESULTS:The level of HPV16 E6/E7 antibodies in lung cancer group were significantly higher than those of normal control group,and the difference was statistically significant(P<0.05).The antibody positive rate of HPV16 E6/E7 in squamous cell carcinoma of lung group was significantly higher than that of adenocarcinoma group,and the difference was statistically significant(P<0.05).CON?CLUSION:There was a correlation between HPV infection and lung squamous cell carcinoma,which will be helpful for the further study of molecular mechanism of lung squamous cell carcinoma.
lung cancer;HPV;liquichip
R734.2
A
2095?6894(2017)02?46?02
2016-11-25;接受日期:2016-12-10
陜西省自然科學(xué)基礎(chǔ)研究計劃項目(2013JQ4039)
姚 麗.博士,主治醫(yī)師.研究方向:腫瘤分子病理學(xué).Tel:029?84777744 E?mail:yaoli@fmmu.edu.cn
張 偉.主任醫(yī)師,教授.E?mail:zhangyi@fmmu.edu.cn