CN117844748A - 肿瘤抗原特异性记忆性cd8 t细胞的鉴定、体外扩增及应用方法 - Google Patents
肿瘤抗原特异性记忆性cd8 t细胞的鉴定、体外扩增及应用方法 Download PDFInfo
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Abstract
本申请提供了一种实体肿瘤引流淋巴结抗原特异性记忆性CD8T细胞的鉴定、体外扩增及应用方法。
Description
技术领域
本发明属于免疫应答和肿瘤生物治疗领域,尤其涉及一种新型的实体肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞的鉴定、体外扩增及应用方法。
背景技术
恶性肿瘤是严重危害我国公众健康的重大疾病,据国家癌症中心发布的统计数据,我国仅2015年一年新增癌症病例就高达392.9万,死亡病例233.8万,二者均高居世界第一。机体的免疫系统可以主动识别肿瘤抗原,发挥免疫监视功能,在早期清除发生癌变的细胞。但是,在特定情形下,肿瘤细胞可以通过多种免疫逃逸策略逃脱机体的免疫监视,形成原发性肿瘤,并建立抑制性肿瘤微环境,抑制抗肿瘤免疫应答,促进肿瘤生长与进展。
激活的肿瘤抗原特异性的CD8 T细胞所介导的抗肿瘤免疫应答是机体对抗肿瘤发生发展的主要途径。CD8 T通过其T细胞受体(TCR)识别表达于肿瘤细胞表面的肿瘤抗原肽-MHC I类分子复合物,特异性地杀伤肿瘤细胞,从而在机体的抗肿瘤免疫中扮演关键作用。但是,一旦肿瘤细胞通过免疫编辑(Immunoediting)突破免疫监视,会快速增殖,形成肿瘤组织,并建立抑制性免疫微环境。在此情形下,肿瘤组织内的肿瘤抗原及免疫抑制性分子(PD-L1,CD48,Galectin-1,IDO及IL-10等)通过TCR及共抑制信号途径,持续刺激肿瘤特异性的CD8 T细胞,最终使之分化为终末耗竭的CD8 T细胞(Exhausted T cell,TEX)。与耗竭T细胞相对应的概念是效应T细胞(effector T cells,Teff)及记忆性T细胞(memory Tcells,Tmem)。效应性T细胞具备较强的效应功能,可以分泌功能性细胞因子(IFN-γ,TNF-α等),并且通过穿孔素-颗粒酶(perforin-granzyme)途径直接杀伤病毒感染的靶细胞或癌变细胞。而记忆性T细胞则可以长久维持,再次识别病毒或者肿瘤抗原时,能快速增值,迅速、高效地清除病毒感染或癌变细胞。与之相反的是,耗竭的CD8 T细胞渐进式丧失细胞因子分泌功能、靶细胞杀伤功能、易于凋亡,并失去分化为记忆细胞的潜力。基于这些特性,耗竭的CD8 T细胞在群体水平失去控制肿瘤生长及进展的能力。因此,在细胞及分子水平,深入研究肿瘤环境下CD8 T细胞耗竭机制可能为逆转耗竭、提升肿瘤免疫治疗提供新的思路,具有重要的理论意义及临床价值。
目前针对CD8 T细胞耗竭的免疫策略主要是阻断抑制性受体相关信号通路,以PD-1/PD-L1阻断抗体为代表的免疫检查点阻断疗法在恶性黑色素瘤、非小细胞肺癌及肾癌的治疗中取得了较好的效果,中位疗效持续时间约为传统化疗的2-3倍,然而患者反应率最高不超过30%。此外,临床研究发现在初始阶段响应的病人在后期会出现耐药抵抗或复发,只有极少数病人(<5%)可被临床治愈。
目前,领域内大多数的观点认为,肿瘤组织浸润的耗竭前体细胞(progenitorexhausted T cell,TPEX)是响应PD-1免疫检查点治疗的关键细胞亚群。但是,这一细胞亚群在浸润的肿瘤特异性CD8 T细胞所占比例较低,其增殖潜力有限,很难解释PD-1免疫检查点阻断疗法显著的抗肿瘤效应。并且,研究表明,肿瘤组织浸润的耗竭CD8 T细胞各亚群呈现相对固化的表观遗传及转录状态,PD-1免疫检查点阻断很难改变已经固化的表观遗传特性。进一步提升PD-1免疫检查点阻断疗法的响应率及持续效应是肿瘤免疫治疗领域目前面临的重大挑战。未来取得突破的关键之一可能在于厘清、鉴定响应PD-1免疫治疗的新的关键CD8 T细胞亚群,并阐明其响应的分子调控机制。
发明内容
本发明提供了一种新型的实体肿瘤引流淋巴结(Tumor draining lymph nodes,TdLN)内抗原特异性记忆性CD8 T细胞及其鉴定、扩增和应用。本发明利用流式细胞分选及分析技术,鉴定了新型的富集于小鼠肿瘤引流淋巴结内的具有记忆细胞特征的、非耗竭的肿瘤特异性CD8 T细胞。此独特的细胞亚群高表达记忆T细胞表面分子CD62L、CD127、CD122、CCR7,不表达抑制性受体Tim3、LAG3、CD39,2B4,使其区别于肿瘤内浸润的耗竭前体细胞及其它耗竭细胞亚群;表达CD44(源自人的细胞为CD45RA-CD45RO+)而区分于初始CD8 T细胞;高表达转录因子TCF-1而区分于效应CD8 T细胞;表达低水平PD-1而区分于经典的记忆性CD8 T细胞。这一新型细胞亚群对持续补充及维持肿瘤组织内浸润(Tumorinfiltrating T cells,TILs)的耗竭CD8 T细胞各亚群至关重要。更重要的是,这一细胞亚群是持续响应肿瘤PD-1/PD-L1免疫检查点阻断疗法的关键细胞亚群。
在一个方面,本发明提供了一种源自肿瘤引流淋巴结的抗原特异性记忆性CD8 T细胞(下文称为“本发明的细胞”或“本发明的CD8T细胞”或“本发明的新型细胞群体”),其特征在于,是具有以下标志物组合的细胞:活化的CD62L+PD1Low/dimTim3-CD8+T细胞。
在一个优选实施方案中,本发明的细胞是:
对于小鼠肿瘤来源:
CD44+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T细胞;
对于人肿瘤来源:
CD3+CD4-CD45RA-CD45RO+CD62L+CD127+CD122+CCR7+PD1Low/dim Tim3-CD39-LAG3-CD8+T细胞。
在一个方面,本发明的新型细胞群体的特征在于,高表达CD122,CD62L,CD127,CCR7,缺失表达2B4,LAG3,Tim3,CD39,表达较低水平的抑制性受体PD-1,优选地,本发明的新型细胞群体高表达转录因子TCF-1并且能够持续响应PD-1/PD-L1免疫检查点阻断疗法。
在另一个方面,本发明提供了分离自肿瘤引流淋巴结的抗原特异性记忆性CD8 T细胞在抗肿瘤中的应用。在一个具体实施方案中,本发明提供了所述T细胞在用于抑制肿瘤生长的过继细胞转移疗法中的用途,即将富集的或增殖的自身的或非自身的所述T细胞注射/回输至患者体内。在一个优选的实施方案中,所述肿瘤选自黑色素瘤和和卵巢癌。在一个具体实施方案中,所述T细胞与PD-1/PD-L1免疫检查点阻断疗法共同施用,优选地,所述PD-1/PD-L1免疫检查点阻断疗法是抗PD-L1或PD-1抗体。
在又一个方面,本发明提供了从肿瘤引流淋巴结分离本发明所述的T细胞的方法,包括下列步骤:
a.从小鼠或人实体肿瘤引流淋巴结获取单细胞悬液;
b.从上述单细胞悬液分选活化的CD62L+PD1Low/dimTim3-CD8+T细胞,
优选地,对于小鼠,从所述单细胞悬液分选
CD44+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T细胞;
对于人,从所述单细胞悬液分选
CD3+CD4-CD45RA-CD45RO+CD62L+CD127+CD122+CCR7+PD1Low/dim Tim3-CD39-LAG3-CD8+T细胞;
优选地,所述T细胞通过流式细胞术或磁珠分选获得;和
c.在含有CD3/28抗体,低剂量白介素2、白介素7和15的T细胞培养基中进行体外扩增培养。
本发明的目的通过下述关键技术方案实现:
(1)利用流式细胞分析技术,结合小鼠肿瘤模型及人卵巢癌样本鉴定肿瘤引流淋巴结内抗原特异性非耗竭的记忆性CD8 T细胞的免疫表型;
(2)利用流式细胞分选技术分选出肿瘤引流淋巴结内高表达记忆细胞相关分子、低表达PD-1的非耗竭活化CD8 T细胞亚群,通过优化的T细胞体外(in-vitro)培养条件,进一步扩增该细胞数量,为后续治疗做准备;
(3)通过单独回输该群细胞或联合PD-1/PD-L1免疫检查点阻断疗法治疗小鼠肿瘤。
使用本发明所述的方法能够精确、有效地获得肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞(Tumor specific memory CD8 T cell,TTSM)。与本领域公认的耗竭前体细胞及肿瘤组织浸润淋巴细胞(TILs)相比,该群细胞具有抗原非依赖性的稳态增殖能力,并在再次接触相同肿瘤抗原时具有强大的快速增殖潜能。且肿瘤中浸润的各耗竭CD8 T细胞亚群(耗竭前体细胞及终末耗竭细胞)依赖于该群细胞的补充,过继转移这一群细胞可以抑制肿瘤生长。此外,与耗竭前体细胞相比,该群细胞是真正响应PD-1/PD-L1免疫检查点阻断疗法的关键细胞亚群,并且与PD-1/PD-L1免疫检查点阻断疗法展示出显著的协同效应。该发明有效提高肿瘤免疫治疗的效力,为本领域相关研究提供了新的方向和启发。
附图说明
图1显示了小鼠皮下移植瘤模型的建立及流式细胞分析策略。
图2显示了肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞免疫表型分析。
图3显示了肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞记忆表型验证。
图4肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞有效控制肿瘤生长。
图5:肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞在免疫检查点阻断疗法中的重要作用并与PD-L1免疫治疗显示出协同效应。
图6:人卵巢癌引流淋巴结中存在抗原特异性记忆性CD8 T细胞。
具体实施方式
下面将结合实施例对本申请的实施方案进行详细描述,但是本领域技术人员将理解,下列实施例仅用于说明本申请,而不是对本申请的范围的限定。根据优选实施方案的下列详细描述,本申请的各种目的和有利方面对于本领域技术人员来说将变得明显。
实施例1:用于分离小鼠肿瘤引流淋巴结内抗原特异性记忆性CD8 T细胞的移植瘤模型的建立
1、肿瘤细胞系准备:本实施例利用小鼠黑色素瘤细胞系B16.F10建立小鼠皮下移植瘤模型,该细胞系使用含有10%胎牛血清(Fetal bovine serum,FBS)、1%青-链霉素和2mM L-谷氨酰胺的DMEM培养基进行传代与体外培养。
2、肿瘤细胞接种:待小鼠黑色素瘤细胞B16融合密度达到80%-90%左右时,消化细胞,计数后用1XPBS缓冲液调整肿瘤细胞悬液的浓度至5×106细胞/mL,用1mL BD胰岛素针吸取0.1mL肿瘤细胞悬液;一手抓持小鼠耳朵与背部之间的皮肤,充分暴露小鼠的腹部,用75%酒精棉球清洁皮肤;另一只手持注射器,水平进针(与小鼠腹部平面夹角约0-15°)刺入小鼠腹股沟部位皮肤,回抽负压则将肿瘤细胞悬液打入皮下,形成一个小皮丘,注射完毕后快速平行出针,防止细胞悬液流出。
3、细胞注射8-10天后观察肿瘤生长情况,通常在8天左右可见肿瘤长至黄豆大小,之后每两天用游标卡尺测量并记录肿瘤大小(肿瘤体积计算公式为:肿瘤体积=1/2长x宽2,单位:mm3)。根据具体实验要求确定观察终点(图1A)。从伦理学角度考虑,当肿瘤体积达2000mm3时即判定小鼠死亡。
实施例2:肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞的分离获取及免疫表型鉴定
1、将小鼠处死后小心分离出腹股沟皮下淋巴结,通常定位于下腹壁三支皮下浅表血管相交处;以载玻片磨砂区域小心研磨淋巴结,随后用含有10%胎牛血清的RPMI-1640培养基冲洗研磨区域,反复若干次后收集细胞混悬液,于4℃离心6分钟,离心力设置为400g。离心后再以无菌PBS重悬,轻轻将细胞沉淀吹打几次,再次离心后以一定体积上述培养基重悬,制成单细胞悬液后备用;
2、优选的:同时,分离皮下肿瘤组织,充分研磨后以密度梯度离心法分离肿瘤组织浸润的淋巴细胞作为对照。分离液Percoll密度梯度为:上层44%,下层67%,于室温离心30分钟,离心机转速为550g;
3、肿瘤抗原特异性的CD8 T细胞免疫表型分析
3.1将从肿瘤淋巴结分离的细胞计录细胞总数,再用荧光抗体染色。流式细胞染色步骤参考文献:转录因子TCF-1在病毒特异性T细胞免疫应答中的作用及机制研究.黄启钊.2018.博士毕业论文(已公开)。在本实施例中,我们用Live/Dead(L/D)染料区分死细胞,进行流式细胞分析,以CD3、CD8和CD44标记经抗原活化的细胞。根据其在总细胞的频率和总细胞数量,确定抗原特异性的CD8 T细胞的数量(图1B);
3.2检测细胞表面分子的表达,包括PD-1,2B4,LAG3,Tim3等抑制性受体;CD122,CD62L,CD127、CCR7等记忆相关分子及其他相关细胞表面分子,上述表面分子均可以使用流式细胞仪进行定量分析;
3.3检测核内转录因子,主要包括TCF-1,TOX,Eomes等T细胞分化相关重要转录因子。
从结果可知,肿瘤引流淋巴结中存在一群高表达CD122,CD62L,CD127、CCR7等记忆相关分子,缺失表达2B4,LAG3,Tim3,CD39等抑制性受体的抗原特异性CD8 T细胞;同时,该群细胞高表达记忆细胞相关转录因子TCF-1(GFP指代)(见图2),提示该群细胞具有记忆细胞特征。
实施例3:肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞的表型验证
1、流式细胞技术分选目的细胞亚群:从实施例2中确定肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞高表达记忆T细胞相关标志分子,低表达耗竭细胞相关标志分子PD-1,缺失表达2B4,LAG3,Tim3、CD39等抑制性受体。因此,我们将引流淋巴结抗原特异性记忆性CD8T细胞定义为CD44+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T细胞,利用该分子标志从小鼠肿瘤引流淋巴结内分选出目的细胞亚群。
2、验证目的细胞亚群的记忆特性:将分选得到的目的细胞亚群及急性感染模型中的经典记忆细胞标记细胞增殖染料(Cell trace Violet)以相同数量混合后回输至受体小鼠,分别在不同时间点取受体鼠脾脏,观察两种来源细胞的长期维持能力及稳态增殖能力(图3C-E);另外,将相同数量两种来源的细胞混合之后输入/>受体小鼠,再次给与相同抗原刺激,观察肿瘤引流淋巴结及急性病毒感染中分别形成的记忆细胞在遇到相同抗原时细胞应答能力有何区别(图3A、B)。结果表明,引流淋巴结抗原特异性记忆细胞与经典记忆细胞类似,能够不依赖于抗原进行稳态增殖(self-renew),并长期存活(图3C-E);遇到相同抗原再次刺激时比肿瘤组织浸润的抗原特异性细胞具有更好的扩增能力(图3A、B)及效应功能,从而更好地控制表达相同抗原的李斯特菌感染(图3F、G)。
实施例4:肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞体外扩增与应用
1、体外扩增目的细胞亚群:将实施例2中分离得到的CD44+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T细胞进行体外培养,培养基为含有10%胎牛血清(FBS)的RPMI1640培养基,同时加入0.5μg/ml CD28抗体,1-5ng/ml白介素2和20ng/ml白介素7及15(IL2/IL7/IL15)。分选目的细胞后计数,按照24孔板每个孔1X106个细胞铺入事先包被有2-5μg/ml CD3抗体的培养板内,培养2-3天后观察细胞扩增情况,扩增良好时可见大量克隆集落形成,之后将细胞转移至不含CD3/28抗体的12孔板内,如此方法连续培养7-10天,计数后用于下一步实验;
2、肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞能有效控制肿瘤生长:在验证肿瘤引流淋巴结该群细胞的治疗效果时(B16模型),我们选取肿瘤组织浸润的抗原特异性CD8+T细胞(tumor infiltrating lymphocytes,TIL)作为对照,在肿瘤接种第8-10天时分别给荷瘤小鼠回输2X105个目的细胞,之后记录肿瘤生长曲线和荷瘤小鼠存活情况(图4A),如图4所示,与传统的肿瘤组织浸润耗竭T细胞(TME-TEX)相比,本发明的淋巴结来源的记忆细胞能够更加有效的控制肿瘤生长,延长荷瘤小鼠存活时间。
此外,我们在小鼠荷瘤第8天时将小鼠双侧引流淋巴结切除,之后回输淋巴结抗原特异性记忆细胞,分别在接种肿瘤第10、13/16天给与PD-L1阻断抗体(BioXCell公司,Cat#BE0101)或对照试剂(IgG),同时给细胞回输联合anti-PD-L1阻断抗体治疗组以FTY710处理(图5A)。结果显示,淋巴结切除后anti-PD-L1阻断抗体失去控制肿瘤作用,回输补充该群细胞后,能有效回复该阻断抗体的抗肿瘤效果;若使用淋巴细胞迁移抑制剂FTY-720阻断该群细胞从淋巴结向外周的迁移,anti-PD-L1阻断抗体亦失去控制肿瘤作用(图5B,C)。以上结果进一步提示定位于肿瘤引流淋巴结的抗原特异性记忆细胞在肿瘤免疫治疗中的重要作用。
实施例5:卵巢癌患者肿瘤引流淋巴结抗原特异性记忆性CD8 T细胞的分离获取及免疫表型鉴定
1、卵巢癌患者筛选:本实施例选取2例适合手术切除的卵巢癌初治患者。术前与患者签订知情同意书并报伦理委员会审批通过。
2、肿瘤标本处理:
(1)手术取出肿瘤组织后小心剔除表面附着的结缔组织,剪成1cm X 1cm大小的组织块,用眼科剪充分剪碎,放入15ml离心管内,而后每管肿瘤组织加入适量体积(5-8ml)的I型胶原酶(Collagenase I)溶液,于37℃摇床消化45min-1h,胶原酶用RPMI-1640培养基溶解,工作浓度为1mg/ml。
(2)消化完成后每管加入等体积的含2%FBS的RPMI-1640培养基(R2),充分颠倒混匀以终止胶原酶反应。在70μm尼龙滤网上,用注射器塑料尾端研磨即可(也可用300-400目不锈钢滤网替代)。
(3)细胞悬液离心(2000rpm,10min,室温)弃上清,每管以8ml 44%Percoll溶液(体积比,用RPMI稀释)重悬,之后插入毛细加样针(巴氏管),缓缓加入4ml 67%Percoll溶液,静置一段时间,可见液体分为红白两层,轻柔的取出毛细玻璃针,离心,室温,550g,30min,升速降速调为零(若条件允许,以上液体最好加入15ml圆底摇菌管或离心管内进行分层离心)。
(4)离心完成后取出流式管,注意取出的过程要动作轻柔,以免破坏分层。此时可见液体分为三层,中间层为白色云絮状,即为淋巴细胞层,首先用1ml移液枪小心吸弃最上层棕黄色油脂,之后用1ml枪一边旋转一边缓慢吸取,加到事先加有3-5ml R2的15ml离心管内,充分混匀后,离心(2000rpm,10min,4℃)重悬,计数。
(5)离心后弃上清,以一定体积含10%FBS的RPMI-1640培养基(R10)重悬待用。
(6)淋巴结若较小,直接在70μm尼龙滤网上研磨,若较大,则剪碎后,再研磨,计数,冻存即可。若肿瘤细胞转移至淋巴结,剪碎之后也需要I型胶原酶消化。
3、流式细胞技术检测肿瘤抗原特异性CD8 T细胞免疫表型
(1)将2所得细胞计数后按0.5~1x106细胞对应50微升染色缓冲液;配置流式染色工作液FACS buffer:PBS+2%FBS+0.01%NaN3
(2)按实施例2.3所述方法进行荧光抗体标记,不同的是,对于人的样本,以CD45RA-CD45RO+标记经抗原活化的记忆细胞(对应小鼠的CD44)。
(3)从结果可知,抗原特异性记忆CD8 T细胞也存在于卵巢癌肿瘤引流淋巴结中。类似的,高表达CD122,CD62L,CD127、CCR7等记忆相关分子,缺失表达2B4,LAG3,Tim3,CD39等抑制性受体的抗原特异性CD8 T细胞;同时,该群细胞高表达记忆细胞相关转录因子TCF-1(图6)。以上结果进一步证实CD3+CD4-CD45RA-CD45RO+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T的存在,为肿瘤临床免疫治疗提供新的理论依据。
Claims (10)
1.一种源自肿瘤引流淋巴结的抗原特异性记忆性T细胞,其特征在于,是具有以下标志物组合的细胞:
活化的CD62L+PD1Low/dimTim3-CD8+T细胞。
2.根据权利要求1所述T细胞,其特征在于,是具有以下标志物组合的T细胞:
对于小鼠肿瘤来源:CD44+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T细胞;
对于人肿瘤来源:CD3+CD4-CD45RA-CD45RO+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T细胞。
3.根据权利要求1或2所述的T细胞,其中所述T细胞通过流式细胞术或磁珠分选获得。
4.根据权利要求1-3任一项所述的T细胞,其特征在于,高表达CD122,CD62L,CD127,CCR7,缺失表达2B4,LAG3,Tim3,CD39,表达较低水平的抑制性受体PD-1,并且高表达转录因子TCF-1。
5.根据权利要求1-4任一项所述的T细胞,其特征在于,能够持续响应PD-1/PD-L1免疫检查点阻断疗法。
6.权利要求1-5中任一项定义的T细胞在制备用于抑制肿瘤生长的药物中的用途,优选地,所述T细胞通过过继细胞转移疗法而抑制肿瘤生长;优选地,所述肿瘤选自黑色素瘤和卵巢癌。
7.权利要求1-5中任一项定义的T细胞与PD-1/PD-L1免疫检查点阻断疗法的组合在制备用于抑制肿瘤生长的药物中的用途,优选地,所述T细胞通过过继细胞转移疗法而抑制肿瘤生长;优选地,所述肿瘤选自黑色素瘤和卵巢癌。
8.根据权利要求7所述的用途,其中所述PD-1/PD-L1免疫检查点阻断疗法是抗PD-L1抗体或抗PD-1抗体。
9.一种药物组合物,其包含权利要求1-5中任一项定义的T细胞和药学上可接受的载体。
10.一种分离抗原特异性记忆性CD8+T细胞的方法,包括下列步骤:
a.从小鼠或人实体肿瘤引流淋巴结获取单细胞悬液;
b.从上述单细胞悬液分选活化的CD62L+PD1Low/dimTim3-CD8+T细胞,
优选地,对于小鼠,从所述单细胞悬液分选CD44+CD62L+CD127+CD122+CCR7+PD1Low/ dimTim3-CD39-LAG3-CD8+T细胞;对于人,从所述单细胞悬液分选CD3+CD4-CD45RA-CD45RO+CD62L+CD127+CD122+CCR7+PD1Low/dimTim3-CD39-LAG3-CD8+T细胞;
优选地,所述T细胞通过流式细胞术或磁珠分选获得;和
c.在含有CD3/28抗体,低剂量白介素2、白介素7和15的T细胞培养基中进行体外扩增培养。
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