于 鴻 張耿月 金禹龍 狄 娜 何春瑩 魏天雪 都韌秋
1.吉林省腫瘤防治研究所細(xì)胞生物研究室,吉林長(zhǎng)春130012;2.吉林省腫瘤醫(yī)院病案室,吉林長(zhǎng)春130012
宮頸癌患者外周血淋巴細(xì)胞亞群分布的差異分析
于鴻1張耿月1金禹龍1狄娜1何春瑩1魏天雪1都韌秋2▲
1.吉林省腫瘤防治研究所細(xì)胞生物研究室,吉林長(zhǎng)春130012;2.吉林省腫瘤醫(yī)院病案室,吉林長(zhǎng)春130012
目的檢測(cè)分析宮頸癌患者外周血淋巴細(xì)胞亞群的差異分布及臨床意義。方法采用流式細(xì)胞術(shù)檢測(cè)宮頸癌患者和健康對(duì)照成人外周血中CD3+、CD3+CD4+、CD3+CD8+、NK、NKT、CD8+CD28+、CD8+CD28-、CD3+HLA-DR+、CD3-HLA-DR+、Treg細(xì)胞的百分比,同時(shí)結(jié)合宮頸癌患者的臨床診斷分期做對(duì)比分析。結(jié)果與健康對(duì)照組比較,宮頸癌患者外周血中CD3+(P=0.0002)和CD3+CD4+T細(xì)胞百分比(P=0.0004)以及CD3+CD4+/CD3+CD8+比值(P=0.0256)顯著降低;宮頸癌患者CD3+CD8+T細(xì)胞百分比與對(duì)照組比較無(wú)顯著差異,但是隨著患者臨床分期的提高呈降低趨勢(shì)(P=0.0480)。NK細(xì)胞(P<0.0001)、活化T細(xì)胞(CD3+HLA-DR+:P<0.0001)、活化B細(xì)胞(CD3-HLA-DR+:P=0.0021)百分比顯著提高;細(xì)胞毒性T細(xì)胞(CD8+CD28+)細(xì)胞百分比降低(P=0.0006),抑制性T細(xì)胞(CD8+CD28-)百分比提高(P=0.0009);CD4+CD25brightT細(xì)胞(Treg)陽(yáng)性細(xì)胞百分比與對(duì)照組比較沒(méi)有顯著差異,但CD4+CD25brightT細(xì)胞(Treg)在CD4+淋巴細(xì)胞中的百分比顯著高于對(duì)照組(P=0.0335)。宮頸癌患者外周血中CD8+CD28-/CD8+CD28+之比與對(duì)照組比較顯著提高(P<0.0001)。結(jié)論宮頸癌患者細(xì)胞免疫功能降低。精確分析宮頸癌患者的T淋巴細(xì)胞亞群變化對(duì)于臨床診斷、治療和預(yù)后評(píng)估具有重要的實(shí)際意義。
宮頸惡性腫瘤;淋巴細(xì)胞亞群;流式細(xì)胞術(shù);腫瘤免疫
[Abstract]Objective To test and analyze the differences of distribution of lymphocyte subsets in peripheral blood in the patients with cervical cancer and its clinical significance.Methods Percentages of CD3+,CD3+CD4+,CD3+CD8+,NK,NKT,CD8+CD28+,CD8+CD28-,CD3+HLA-DR+,CD3-HLA-DR+,Treg cells were tested in adult peripheral blood in the patients with cervical cancer and health controls via flow cytometry.Comparative analysis was conducted in combination with the clinical diagnosis staging in the patients with cervical cancer.Results Compared with the healthy control group,the percentages of CD3+(P=0.0002)and CD3+CD4+T cells(P=0.0004)in the peripheral blood in the patients with cervical cancer and CD3+CD4+/CD3+CD8+ratio(P=0.0256)were significantly reduced;the percentages of CD3+CD8+T cells in the patients with cervical cancer were not statistically significant compared with that in the control group,but with the increase of clinical staging,the percentage was in a decreasing trend(P=0.0480).The percentages of NK cells(P<0.0001),activated T cells(CD3+HLA-DR+:P<0.0001),and activated B cells(CD3-HLADR+:P=0.0021)were significantly improved;the percentage of toxic T cells(CD8+CD28+)was reduced(P=0.0006),and the percentage of inhibitive T cells(CD8+CD28-)was increased(P=0.0009);the percentage of CD4+CD25bright(Treg)cells was not significantly different from that in the control group,but the percentage of CD4+CD25bright(Treg)cells in CD4+lymphocytes was significantly higher than that in the control group(P=0.0335).CD8+CD28-/CD8+CD28+ratio in the peripheral blood in the patients with cervical caner was significantly increased compared with that in the control group(P<0.0001).Conclusion Cell immunological function is reduced in the patients with cervical cancer.Accurate analysis of the changes of T lymphocyte subsets in the patients with cervical cancer has important and practical significance in clinical diagnosis,treatment and prognosis evaluation.
[Key words]Cervical malignant tumor;Lymphocyte subsets;Flow cytometry;Tumor immunology
宮頸癌是女性中最常見(jiàn)的腫瘤,也是導(dǎo)致女性癌癥死亡的首要原因之一。其發(fā)生發(fā)展與免疫功能尤其是細(xì)胞免疫功能失調(diào)密切相關(guān)。此外,宮頸癌的預(yù)后也與腫瘤浸潤(rùn)淋巴細(xì)胞中存在的免疫細(xì)胞類(lèi)型有關(guān),如細(xì)胞毒性CD8+T細(xì)胞、CD4+T細(xì)胞、調(diào)節(jié)性T細(xì)胞等,具體涉及它們的數(shù)量、功能狀態(tài)及腫瘤細(xì)胞表達(dá)的相關(guān)配體等等[1]。本研究采用流式細(xì)胞術(shù)檢測(cè)宮頸癌患者和健康成人外周血中總T淋巴細(xì)胞(CD3+)、T輔助/誘導(dǎo)細(xì)胞(CD3+CD4+)、T抑制/細(xì)胞毒細(xì)胞(CD3+CD8+)百分比、自然殺傷細(xì)胞(nature killer cells,NK)、NK樣T細(xì)胞(NKT)、細(xì)胞毒性T細(xì)胞(CD8+CD28+)、抑制性T細(xì)胞(CD8+CD28-)、調(diào)節(jié)性CD4+CD25brightT細(xì)胞(Treg)、活化T細(xì)胞(CD3+HLA-DR+)、靜止T細(xì)胞(CD3+HLA-DR-)、活化B細(xì)胞(CD3-HLA-DR+)的百分比,計(jì)算并比較CD3+CD4+/CD3+CD8+比值,同時(shí)結(jié)合宮頸癌患者的臨床診斷分期做對(duì)比分析,為臨床診斷治療提供實(shí)驗(yàn)依據(jù)。
1.1一般資料
選擇吉林省腫瘤醫(yī)院2014年1月~2015年12月期間經(jīng)病理確診為宮頸癌(鱗癌和腺鱗癌)且未經(jīng)手術(shù)、放化療的住院患者306例,排除嚴(yán)重感染或自身免疫病病例?;颊咂骄挲g(51.62±6.88)歲(年齡范圍21~75歲)。健康對(duì)照來(lái)自本院體檢人群,共56例,均為女性,平均年齡(49.61±6.60)歲(年齡范圍25~71歲)。兩組年齡等一般資料比較,差異無(wú)統(tǒng)計(jì)學(xué)意義(P>0.05),具有可比性。患者的臨床基本信息見(jiàn)表1。
表1 宮頸癌患者的基本臨床信息(n=306)
1.2方法
1.2.1試劑熒光標(biāo)記的抗人抗體CD45-FITC/CD4-RD1/CD8-ECD/CD3-PC5(Catalog No:6607013),CD3-FITC/CD16+56-PE(Catalog No:A07735),CD3-FITC/ HLA-DR-PE(Catalog No:A07737),CD8-FITC(Catalog No:A07756),CD28-PE(Catalog No:IM2071U),CD4-FITC(CatalogNo:A07750),CD25-PE(CatalogNo:A07774),OptiLyse@C Lysis Solution(Catalog No:A11895)均為貝克曼公司產(chǎn)品。
1.2.2樣本制備每個(gè)樣本采集2 mL靜脈血。按照試劑說(shuō)明書(shū)操作。每100 μL外周血加5~10 μL抗體,避光室溫孵育15~20 min后,OptiLyse@C Lysis Solution裂解紅細(xì)胞,離心后PBS洗1次,加500 μL PBS,上機(jī)檢測(cè)。采用Beckman Coulter Epics XL-MCL流式細(xì)胞儀,Expo32 ADC軟件獲取數(shù)據(jù),收集10000個(gè)細(xì)胞,Expo32 V1.2軟件分析數(shù)據(jù)。
1.3觀(guān)察指標(biāo)
檢測(cè)宮頸癌患者和健康成人外周血中總T淋巴細(xì)胞(CD3+)、T輔助/誘導(dǎo)細(xì)胞(CD3+CD4+)、T抑制/細(xì)胞毒細(xì)胞(CD3+CD8+)百分比、自然殺傷細(xì)胞(nature killer cells,NK)、NK樣T細(xì)胞(NKT)、細(xì)胞毒性T細(xì)胞(CD8+CD28+)、抑制性T細(xì)胞(CD8+CD28-)、調(diào)節(jié)性CD4+CD25brightT細(xì)胞(Treg)、活化T細(xì)胞(CD3+HLADR+)、靜止T細(xì)胞(CD3+HLA-DR-)、活化B細(xì)胞(CD3-HLA-DR+)的百分比,計(jì)算并比較CD3+CD4+/CD3+CD8+比值,同時(shí)結(jié)合宮頸癌患者的臨床診斷分期進(jìn)行對(duì)比分析。
1.4統(tǒng)計(jì)學(xué)分析
使用SPSS 17.0和GraphPad Prism 5軟件進(jìn)行統(tǒng)計(jì)學(xué)分析。計(jì)量資料數(shù)據(jù)以(x±s)表示。組間比較采用方差分析和獨(dú)立樣本的t檢驗(yàn)或Mann Whitney U檢驗(yàn),淋巴細(xì)胞亞群百分比與臨床分期的相關(guān)性分析采用Spearman等級(jí)相關(guān)性分析,P<0.05為差異有統(tǒng)計(jì)學(xué)意義。
2.1兩組外周血中總T淋巴細(xì)胞(CD3+)、T輔助/誘導(dǎo)細(xì)胞(CD3+CD4+)、T抑制/細(xì)胞毒細(xì)胞(CD3+CD8+)細(xì)胞百分比比較
見(jiàn)圖1,與對(duì)照組比較,宮頸癌患者外周血中CD3+和CD3+CD4+細(xì)胞百分比、CD3+CD4+/CD3+CD8+比值顯著降低[CD3+:(61.75±8.13)%vs(69.85±6.61)%;CD3+CD4+:(33.30±3.89)%vs(40.22±7.17)%;CD3+CD4+/CD3+CD8+:(1.59±0.54)vs(1.95±0.68)]。Ⅲ/Ⅳ期宮頸癌患者的CD3+細(xì)胞百分比均顯著低于對(duì)照組;Ⅳ期宮頸癌患者的CD3+CD4+細(xì)胞百分比顯著低于對(duì)照組,說(shuō)明宮頸癌患者外周血中CD3+和CD3+CD4+細(xì)胞百分比的降低與臨床分期的提高存在負(fù)相關(guān)趨勢(shì),雖然Spearman等級(jí)相關(guān)性分析結(jié)果表明差異無(wú)統(tǒng)計(jì)學(xué)意義(CD3+:r=-0.281,P=0.471;CD3+CD4+:r=0.023,P=0.871)。宮頸癌患者T抑制/細(xì)胞毒細(xì)胞[CD3+CD8+:(25.21± 5.28)%)]細(xì)胞百分比的均值與對(duì)照組的(22.28±5.65)%比較,差異無(wú)統(tǒng)計(jì)學(xué)意義(P=0.0872),但隨著患者臨床分期的提高呈降低趨勢(shì)[Ⅰ/Ⅱ期:(27.00±4.07)%;Ⅲ/Ⅳ期:(22.04±4.06)%;對(duì)照組:(22.28±5.65)%)],Spearman等級(jí)相關(guān)性分析結(jié)果顯示r=-0.281,P=0.0480,差異有統(tǒng)計(jì)學(xué)意義(P<0.05)。
2.2兩組外周血中NK(CD3-CD16+56+)和NKT(CD3+CD16+56+)細(xì)胞百分比比較
見(jiàn)圖2,與對(duì)照組比較,宮頸癌患者組NK細(xì)胞百分比[(17.64±3.81)%]顯著高于對(duì)照組[(14.12±4.04)%],差異有高度統(tǒng)計(jì)學(xué)意義(P<0.0001);NK T細(xì)胞百分比[(4.30±1.39)%]顯著低于對(duì)照組[(5.95±1.98)%],差異有高度統(tǒng)計(jì)學(xué)意義(P<0.0001)。
圖1 兩組外周血中總T淋巴細(xì)胞(CD3+)、T輔助/誘導(dǎo)細(xì)胞(CD3+CD4+)、T抑制/細(xì)胞毒細(xì)胞(CD3+CD8+)細(xì)胞百分比比較,A:CD3+、CD3+CD4+、CD3+CD8+細(xì)胞百分比;B:CD3+CD4+/CD3+CD8+比值;C:Ⅲ期和Ⅳ期患者CD3+細(xì)胞百分比;D:Ⅲ期和Ⅳ期患者CD3+CD4+細(xì)胞百分比
圖2 兩組外周血中NK(CD3-CD16+56+)和NKT(CD3+CD16+56+)細(xì)胞百分比比較
2.3兩組外周血中活化T細(xì)胞(CD3+HLA-DR+)、靜止T細(xì)胞(CD3+HLA-DR-)、活化B細(xì)胞(CD3-HLADR+)百分比比較
宮頸癌患者的活化T細(xì)胞(CD3+HLA-DR+)和活化B細(xì)胞(CD3-HLA-DR+)百分比顯著高于健康對(duì)照組[CD3+HLA-DR+:(9.12±2.98)%vs(5.18±1.62)%,P<0.0001;CD3-HLA-DR+:(18.27±5.45)%vs(13.55± 3.15)%,P=0.0021],靜止T細(xì)胞(CD3+HLA-DR-)百分比顯著低于健康對(duì)照組[(50.52±6.87)%vs(63.68± 7.81)%,P<0.0001],且活化B細(xì)胞(CD3-HLA-DR+)水平的升高與臨床分期存在正相關(guān)趨勢(shì),雖然Spearman等級(jí)相關(guān)性分析結(jié)果表明無(wú)統(tǒng)計(jì)學(xué)意義(r=0.221,P= 0.124);Ⅰ/Ⅱ期:(16.99±5.25)%;Ⅲ/Ⅳ期:(20.02± 7.05)%;對(duì)照組:(13.55±3.15)%,見(jiàn)圖3。
圖3 兩組外周血中活化T細(xì)胞(CD3+HLA-DR+)、靜止T細(xì)胞(CD3+HLA-DR-)、活化B細(xì)胞(CD3-HLA-DR+)百分比比較
2.4兩組外周血中細(xì)胞毒性T細(xì)胞(CD8+CD28+)、抑制性T細(xì)胞(CD8+CD28-)、調(diào)節(jié)性CD4+CD25bright(Treg)細(xì)胞百分比比較
CD28是一個(gè)主要的共刺激受體,負(fù)責(zé)優(yōu)化抗原介導(dǎo)的T細(xì)胞活化、增殖和存活。宮頸癌患者外周血中CD8+CD28+細(xì)胞陽(yáng)性細(xì)胞百分比降低[(8.67±2.46)% vs(10.88±3.95)%,P=0.0006],CD8+CD28-細(xì)胞百分比提高[(17.85±4.28)%vs(12.13±4.01)%,P=0.0009],CD4+CD25brightT細(xì)胞(Treg)陽(yáng)性細(xì)胞百分比與對(duì)照組比較無(wú)顯著差異[(3.74±1.18)%vs(3.95±1.29)%,P=0.5514)],見(jiàn)圖4。
圖4 兩組外周血中細(xì)胞毒性T細(xì)胞(CD8+CD28+)、抑制性T細(xì)胞(CD8+CD28-)、調(diào)節(jié)性CD4+CD25brightT細(xì)胞(Treg)陽(yáng)性細(xì)胞百分比比較
2.5兩組外周血中CD8+CD28-/CD8+CD28+比值、CD4+CD25bright/CD4+細(xì)胞百分比比較
宮頸癌患者外周血中CD8+CD28-/CD8+CD28+之比與對(duì)照組比較顯著提高[(1.99±0.58)vs(1.47±0.46),P<0.0001];CD4+CD25brightT細(xì)胞(Treg)在CD4+淋巴細(xì)胞中的百分比顯著高于對(duì)照組[(11.45±4.28)%vs(9.57± 3.84)%,P=0.0335](圖5)。
宮頸癌是女性中最常見(jiàn)的腫瘤,尤其在發(fā)展中國(guó)家,是導(dǎo)致女性死亡率最高的腫瘤之一。已知宮頸癌的形成是由于人類(lèi)乳頭瘤病毒(human papilloma virus,HPV)的持續(xù)感染造成的,因此與清除病毒密切相關(guān)的免疫反應(yīng)在宮頸癌的發(fā)生、發(fā)展和治療中起著更為重要的作用。大量的研究已表明癌癥患者的腫瘤微環(huán)境中的淋巴細(xì)胞亞群分布與患者的臨床分期和預(yù)后關(guān)系密切,然而在實(shí)際臨床治療中取材的困難限制了很多研究的深入進(jìn)行[2]。外周血采集方便,能夠直接分析淋巴細(xì)胞亞群和其他細(xì)胞的百分比,從而評(píng)估患者的免疫狀態(tài)、臨床預(yù)后狀況并預(yù)測(cè)療效。此外,隨著臨床檢測(cè)技術(shù)的飛速進(jìn)展,患者外周血中可檢測(cè)到的各種指標(biāo)越來(lái)越多,精確度也越來(lái)越高,因此分析癌癥患者外周血淋巴細(xì)胞亞群分布具有重要的臨床意義[5-8]。本研究采用流式細(xì)胞術(shù)檢測(cè)宮頸癌患者外周血淋巴細(xì)胞亞群分布,分析其與患者臨床分期的關(guān)系,為宮頸癌的診斷和治療提供實(shí)驗(yàn)依據(jù)。
圖5 宮頸癌患者和健康對(duì)照組外周血中CD8+CD28-/CD8+CD28+比值、CD4+CD25bright/CD4+細(xì)胞百分比比較,A:CD8+CD28-/CD8+CD28+比值;B:CD4+CD25brightT細(xì)胞(Treg)在CD4+淋巴細(xì)胞中的百分比
在T淋巴細(xì)胞中,CD3+細(xì)胞代表了T細(xì)胞的一般水平,反映宿主的細(xì)胞免疫狀態(tài)。CD3+T細(xì)胞又包括CD4+輔助/誘導(dǎo)性T細(xì)胞和CD8+細(xì)胞毒/抑制性T細(xì)胞。后者識(shí)別MHC-I類(lèi)抗原并通過(guò)前者分泌的細(xì)胞因子實(shí)現(xiàn)其調(diào)節(jié)免疫反應(yīng)的功能。本研究中我們共檢測(cè)分析了306例宮頸癌患者的外周血樣本,結(jié)果表明,與健康對(duì)照組比較,宮頸癌患者的CD3+和CD3+CD4+細(xì)胞百分比,CD3+CD4+/CD3+CD8+比值顯著降低,處于晚期的癌癥患者又比早期患者更低。這說(shuō)明宮頸癌患者的免疫功能,尤其是與抗腫瘤相關(guān)的細(xì)胞免疫功能降低[9]。
NK細(xì)胞是大顆粒淋巴細(xì)胞,在機(jī)體的天然免疫中發(fā)揮重要作用。NK細(xì)胞能直接破壞腫瘤細(xì)胞,其水平降低導(dǎo)致免疫功能下降。本研究中我們檢測(cè)的宮頸癌患者均未經(jīng)手術(shù)、放化療治療,其N(xiāo)K細(xì)胞百分比顯著高于健康對(duì)照組,與文獻(xiàn)報(bào)道一致[10]。說(shuō)明宮頸癌患者在感染HPV病毒后機(jī)體的天然免疫防御機(jī)制發(fā)揮了抵抗作用。與此相呼應(yīng),宮頸癌患者外周血中活化T細(xì)胞(CD3+HLA-DR+)百分比也高于健康對(duì)照組,說(shuō)明機(jī)體啟動(dòng)免疫防御機(jī)制抵抗病毒的侵害。有報(bào)道表明B淋巴細(xì)胞的慢性活化是有害的。我們檢測(cè)到宮頸癌患者的活化B細(xì)胞(CD3-HLA-DR+)百分比高于健康對(duì)照組且活化B細(xì)胞水平的升高與臨床分期的提高呈正相關(guān),對(duì)這一結(jié)果的闡釋尚需進(jìn)行更深入的作用機(jī)制研究。
抗腫瘤免疫反應(yīng)非常復(fù)雜,不同類(lèi)型的細(xì)胞之間相互作用,彼此影響[11-14]。已知一些T淋巴細(xì)胞有調(diào)節(jié)功能,如分泌interleukin-10的T細(xì)胞、分泌TGF-β的T細(xì)胞、CD4-CD8-T細(xì)胞、NKT細(xì)胞、CD8+CD28-細(xì)胞、CD4+CD25+regulatory T細(xì)胞等。其中Treg細(xì)胞具有免疫抑制作用,可以阻止其它T細(xì)胞的激活或擴(kuò)增,抑制樹(shù)突狀細(xì)胞的抗原提呈能力,抑制NK細(xì)胞活性,從而使腫瘤逃避免疫監(jiān)視而進(jìn)一步發(fā)展惡化。CD8+CD28-T細(xì)胞也是抑制性T細(xì)胞,抑制其他T淋巴細(xì)胞增殖和細(xì)胞毒性,其發(fā)揮免疫抑制作用主要通過(guò)分泌IL-10和TGF-β等細(xì)胞因子。本研究分析了是否CD8+CD28-、CD4+CD25+Treg細(xì)胞在宮頸癌患者和正常人之間存在差異。結(jié)果表明,CD8+CD28-細(xì)胞在宮頸癌患者中升高且宮頸癌患者外周血中CD8+CD28-/CD8+CD28+之比與對(duì)照組比較顯著提高。雖然二者的CD4+CD25+Treg細(xì)胞水平?jīng)]有顯著差異,但宮頸癌患者的Treg細(xì)胞在CD4+淋巴細(xì)胞中的百分比顯著高于健康對(duì)照組[15,16]。
綜上所述,本研究結(jié)果顯示,宮頸癌患者總體免疫功能下降且與臨床分期關(guān)系密切。后續(xù)的研究需要增加入組患者數(shù)量,增加檢測(cè)指標(biāo),如FoxP3、CD127、CD69、IFN-γ等[17],同時(shí)需要深入研究患者的免疫功能狀態(tài)與腫瘤進(jìn)展和預(yù)后的相關(guān)性,為臨床診斷治療提供實(shí)驗(yàn)依據(jù)。
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Analysis of the differences of distribution of lymphocyte subsets in peripheral blood in the patients with cervical cancer
YU Hong1ZHANG Gengyue1JIN Yulong1DI Na1HE Chunying1WEI Tianxue1DU Renqiu2
1.Cell Biology Research Office,Jilin Research Center for Tumor Prevention and Control,Changchun130012,China;2.Disease Record Room,Jilin Tumor Hospital,Changchun130012,China
R737.3
A
1673-9701(2016)24-0020-05
2016-05-10)
吉林省科技發(fā)展計(jì)劃應(yīng)用基礎(chǔ)研究項(xiàng)目(20130 102097JC)