韓貴良 石巖 任冠穎 王小磊
(河北大學(xué)附屬醫(yī)院腫瘤內(nèi)科,河北保定071000)
鹽酸??颂婺釋θ薚淋巴細(xì)胞增殖的影響
韓貴良 石巖 任冠穎 王小磊
(河北大學(xué)附屬醫(yī)院腫瘤內(nèi)科,河北保定071000)
目的觀察酪氨酸激酶抑制劑(Tyrosine kinase inhibitor,TKI)鹽酸??颂婺釋θ薚淋巴細(xì)胞增殖的影響。方法應(yīng)用免疫磁珠分選的方法從外周血單個(gè)核細(xì)胞(Peripheral blood mononuclear cell,PBMC)中分選出T淋巴細(xì)胞,分別加入不同濃度的鹽酸埃克替尼培養(yǎng)1 h后,加入PMA刺激T細(xì)胞增殖,培養(yǎng)48~72 h后分別收集細(xì)胞和細(xì)胞培養(yǎng)上清。采用四氮甲唑蘭比色法(MTT法)檢測各組細(xì)胞的增殖情況。結(jié)果本研究比較了培養(yǎng)72 h后各組細(xì)胞的增殖情況,發(fā)現(xiàn)鹽酸??颂婺崮軌蛞种芓細(xì)胞的增殖,各組抑制率如下:鹽酸埃克替尼1000 ng/mL組為(12.0±5.0)%(P=0.053),2500 ng/mL組為20.0±3.6%(P=0.011),5000 ng/mL組為21.6±5.6%(P=0.022)。結(jié)論鹽酸??颂婺崮軌蛞种芓細(xì)胞的增殖。
酪氨酸激酶抑制劑;腫瘤免疫;T淋巴細(xì)胞
鹽酸??颂婺崾俏覈哂型耆灾髦R(shí)產(chǎn)權(quán)的小分子靶向抗癌創(chuàng)新藥,臨床研究表明鹽酸??颂婺嵩谕砥诜切〖?xì)胞肺癌治療過程中顯示一定優(yōu)越性[1]。有研究報(bào)道酪氨酸激酶抑制劑伊馬替尼[2]、達(dá)沙替尼[3]、厄洛替尼[4]能夠抑制T細(xì)胞的增殖,但鹽酸??颂婺釋淋巴細(xì)胞的增殖有何影響,尚未見報(bào)道,故作者進(jìn)行了相關(guān)研究,現(xiàn)報(bào)告如下。
1.1 一般材料:①細(xì)胞:人外周血T淋巴細(xì)胞為從人外周富集血中分離;②細(xì)胞培養(yǎng)試劑:細(xì)胞培養(yǎng)液RPMI1640(美國Invitrogen公司),胎牛血清(美國Gibco公司),96孔培養(yǎng)板(美國Corning公司),F(xiàn)icoll分離液(中國醫(yī)學(xué)科學(xué)院血液學(xué)研究所),Pan T cell isolation kitⅡ(德國Miltenyi Biotec公司)。
1.2 設(shè)備:超凈工作臺(tái)(上海力申科學(xué)儀器有限公司),HEPA CLASS100加濕CO2孵箱(美國Thermo公司),JX70倒置顯微鏡及照相系統(tǒng)(日本Olympus公司),Synergy HT酶標(biāo)儀(美國BioTek公司)。
1.3 實(shí)驗(yàn)方法
1.3.1 T細(xì)胞的分離:取4 mL富集外周血,F(xiàn)icoll分離法提取單個(gè)核細(xì)胞,應(yīng)用Pan T cell isolation kitⅡ分選單個(gè)核細(xì)胞,分選柱下方所收集細(xì)胞即為T細(xì)胞。
1.3.2 T淋巴細(xì)胞的培養(yǎng):所得T細(xì)胞以細(xì)胞培養(yǎng)液重懸,使細(xì)胞濃度為1.5×106/mL,以200 μL每孔接種到96孔板中。設(shè)對照組、鹽酸??颂婺峤M,對照組鹽酸??颂婺釢舛葹? ng/mL,鹽酸埃克替尼組設(shè)三個(gè)濃度:1000 ng/mL、2500 ng/mL、5000 ng/ mL;各組加入藥物后于37℃加濕5%CO2孵箱中培養(yǎng)1 h,然后各組均加入佛波酯(PMA),終濃度分別為50 ng/mL,培養(yǎng)48~72h。
1.3.3 MTT法檢測T細(xì)胞增殖情況:T淋巴細(xì)胞密度為1.5×106/mL,接種于96孔板中,每孔培養(yǎng)液200 μL,空白對照孔只加培養(yǎng)液。各組按1.3.2描述中加入藥物,37℃,5%CO2飽和濕度細(xì)胞培養(yǎng)箱孵育72 h,每組每濃度設(shè)3個(gè)復(fù)孔。每孔加入5 mg/ mL MTT液20 μL,繼續(xù)孵育4 h,離心培養(yǎng)板,吸棄上清,每孔加入DMSO150 μL,微量震蕩器震蕩10 min,490 nm波長下檢測每孔的吸光度(OD)值。按下列公式計(jì)算抑制率:抑制率=(1-實(shí)驗(yàn)組平均OD值/對照組平均OD值)×100%。
1.4 統(tǒng)計(jì)學(xué)方法:采用SPSS13.0統(tǒng)計(jì)軟件進(jìn)行數(shù)據(jù)分析,兩組定量資料的比較采用獨(dú)立樣本t檢驗(yàn),P<0.05為差異具有統(tǒng)計(jì)學(xué)意義。
鹽酸埃克替尼能夠抑制T淋巴細(xì)胞的增殖。我們比較了實(shí)驗(yàn)組與對照組間的抑制率,鹽酸??颂婺峤M1000ng/m組為12.0±5.0%(P=0.053),2500ng/ mLl組為20.0±3.6%(P=0.011),5000ng/mL組為21.6±5.6%(P=0.022)。隨藥物濃度增加,抑制率有提高趨勢,提示鹽酸埃克替尼對T細(xì)胞增殖的抑制呈濃度依賴性。
鹽酸埃克替尼是我國自主研制的、具有世界專利的治療非小細(xì)胞肺癌的國家一類新藥,在分子水平,鹽酸??颂婺嵋种艵GFR激酶活性的IC50(當(dāng)50%酶活性被抑制時(shí)的抑制劑濃度)為5 nM,和國外上市產(chǎn)品相當(dāng)。在測定了鹽酸??颂婺釋?5種激酶(包括其突變型)的抑制活性的結(jié)果顯示,鹽酸??颂婺嵩?.5 μM(100倍于對EGFR激酶活性抑制的IC50)時(shí)對EGFR激酶的抑制特異性較高,沒有顯示出對其它激酶的抑制,表明鹽酸??颂婺崾且粋€(gè)特異性較高的EGFR激酶抑制劑[5]。目前該藥物已廣泛應(yīng)用于臨床,并改善了腫瘤患者的生存,但該藥物需長期應(yīng)用,在用藥過程中是否會(huì)影響T細(xì)胞的增殖,目前尚未見報(bào)道,我們對此進(jìn)行了研究。為了更加貼近臨床實(shí)際,我們選取人外周血中的T細(xì)胞作為研究對象,觀察了鹽酸??颂婺釋θ薚淋巴細(xì)胞增殖的影響。在實(shí)驗(yàn)設(shè)計(jì)過程中,我們盡量使實(shí)驗(yàn)條件與體內(nèi)環(huán)境相似,藥物濃度的選取以腫瘤患者服藥后達(dá)到的穩(wěn)態(tài)血藥濃度為參考,實(shí)驗(yàn)藥物濃度均在其附近。按臨床常規(guī)劑量(125 mg tid)應(yīng)用鹽酸埃克替尼,穩(wěn)態(tài)血藥濃度為2500±378 ng/mL[6],實(shí)驗(yàn)組藥物濃度設(shè)為1000 ng/mL、2500 ng/mL、5000 ng/mL。MTT實(shí)驗(yàn)發(fā)現(xiàn),鹽酸??颂婺崮軌蛞种芓細(xì)胞的增殖,僅在較高濃度時(shí)具有統(tǒng)計(jì)學(xué)差異。鹽酸??颂婺崾峭ㄟ^何種機(jī)制抑制T淋巴細(xì)胞的增殖,目前已有酪氨酸激酶抑制劑影響細(xì)胞周期分布的報(bào)道,Ling等[7]已證實(shí)厄洛替尼通過誘導(dǎo)p27kip1的產(chǎn)生阻止細(xì)胞由G1期進(jìn)入S期,從而實(shí)現(xiàn)G1期阻止,Qiong等[4]也發(fā)現(xiàn)厄洛替尼能夠使活化T細(xì)胞中細(xì)胞周期蛋白依賴性激酶(Cyclin-dependent kinase,CDK)抑制劑p27kip1的表達(dá)升高。舒尼替尼對細(xì)胞周期的影響亦有報(bào)道,Yanhong等[8]發(fā)現(xiàn)舒尼替尼能夠使T細(xì)胞內(nèi)細(xì)胞周期素D3和磷酸化視網(wǎng)膜母細(xì)胞瘤蛋白(Rb)減少,同時(shí)CDK6、CDK4磷酸化水平降低,從而實(shí)現(xiàn)G1期阻滯。楊彩玲等[9]研究發(fā)現(xiàn)鹽酸??颂婺嵬ㄟ^降低人舌鱗狀細(xì)胞癌Tca8113,改變Tca8113的細(xì)胞周期分布,有明顯的G0/G1期阻滯作用,由此推斷鹽酸埃克替尼可能是通過影響T細(xì)胞的周期分布,從而影響T淋巴細(xì)胞的增殖。
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The Effect of Icotinib on the Proliferation of T Lymphocyte
Han Guiliang Shi Yan Ren Guanying Wang Xiaolei
(Department of Oncology;Affiliated Hospital of Hebei University,Baoding 071000,China)
ObjectiveTo observe the effect of tyrosine kinase inhibitor(TKI)such as icotinib on T lymphocyte.MethodsTlymphocytes were selected from peripheral blood mononuclear cells by immunomagnetic cell sorting.Then the T lymphocytes were stimulated by Phorbol-12-myristate-13-acetate(PMA)and increasing dose of icotinib was added to the experimental group.After culturing 48-72 hours the proliferation rate of the T lymphocytes was analyzed by MTT.ResultsWe compared the inhibitory rate between the control group and experiment group,and we found that icotinib can inhibit the proliferation of T lymphocyte.ConclusionIcotinib can inhibit the proliferation of T lymphocyte.
Targeted therapy;Tyrosine kinase inhibitor;Tumor immunology
R453
A 學(xué)科分類代碼:32067
1001-8131(2016)06-0639-02
2016-07-18