纤溶酶-α2抗纤溶酶复合物单克隆抗体的制备及鉴定

目的 :制备纤溶酶 α2 抗纤溶酶复合物 (PAP)的单克隆抗体(mAb)。方法 :以从血浆中纯化的PAP免疫BALB/c小鼠。按常规方法融合 ,以固相等分子浓度的纤溶酶原、α2 抗纤溶酶(α2 AP)及PAP为抗原 ,建立间接ELISA筛选杂交瘤细胞培养上清 ,并对杂交瘤细胞分泌的mAb的特异性和亲和力进行鉴定。结果 :共获得 2 4株可稳定分泌特异性mAb的杂交瘤细胞。其中 ,针对PAP分子中纤溶酶结构的mAb 16株 ,针对α2 AP结构的mAb 1株 ,针对新抗原 (PAP分子中新出现的不同于前体分子纤溶酶原及α2 AP的抗原决定簇 )结构的mAb 7株。这些腹水中抗PAPmAb的滴度为 2× 10 -4～ 1× 10 -8,其中 4株mAb的亲和常数为 5 .6 2× 10 -9～ 3.5 8× 10 -11mol/L之间。结论 :成功地制备针对PAP新抗原的具有高亲和力的mAb ,为建立不受其前体分子干扰的PAP特异性检测方法 ,研究纤溶系统的激活状态提供了工具。     

Self-Replicating RNAs Drive Protective Anti-tumor T Cell Responses to Neoantigen Vaccine Targets in a Combinatorial Approach

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Dendritic Cell Paucity Leads to Dysfunctional Immune Surveillance in Pancreatic Cancer

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原发性浆细胞白血病肿瘤新生抗原的筛查和预测

[摘要] 目的：采用基因测序技术结合生物信息分析手段探索原发性浆细胞白血病（PCL）的肿瘤新生抗原。方法：采集1 例原发性PCL患者复发期和缓解期的外周血样本,利用基于序列分型的聚合酶链式反应进行HLA分型,利用二代测序技术对全外显子组和转录组进行测序,利用生物信息学软件NetMHCpan预测新生抗原。结果：该患者复发期外周血中发现6 个肿瘤特异的错义突变基因,分别为FRG1、MLL3、SVIL、MYOM1、ZDHHC11、RFPL4A基因;结合患者的HLA亚型,通过生物信息预测出43条新生抗原。优先选取表达水平较高的FRG1 和MLL3 基因突变所产生的20 条新生抗原,其中4 条新生抗原高度亲合患者的HLA分子,具有潜在的临床应用价值。结论：完成了1 例原发性PCL肿瘤新生抗原的筛查和预测,实践说明基于肿瘤特异的体细胞突变预测新生抗原的方法对于原发性PCL同样可行。     

单细胞测序技术在食管癌研究中应用的进展

单细胞转录组学、基因组学、表观基因组学、多组学等单细胞测序（single cell sequencing,sc-Seq）技术是一种在单细胞水平上研究细胞基因表达和功能变化的强大研究工具。随着sc-Seq技术在食管癌研究中的广泛应用,其将改变人们对食管癌细胞生物学特征的理解,为更精准地从分子层面阐述食管癌的发生、发展和转移的机制,提高其诊断及个体化治疗的水平做出重大贡献。本文就sc-Seq技术在食管癌的发生、发展机制、诊疗和预后相关标志物、免疫治疗及放化疗中的研究进展作一综述。     

Efficacy of immunotherapy targeting the neoantigen derived from epidermal growth factor receptor T790M/C797S mutation in non–small cell lung cancer

Lung cancer is the leading cause of cancer‐related deaths worldwide. Epidermal growth factor receptor‐tyrosine kinase inhibitors (EGFR‐TKI) often have good clinical activity against non–small cell lung cancer (NSCLC) with activating EGFR mutations. Osimertinib, which is a third‐generation EGFR‐TKI, has a clinical effect even on NSCLC harboring the threonine to methionine change at codon 790 of EGFR (EGFR T790M) mutation that causes TKI resistance. However, most NSCLC patients develop acquired resistance to osimertinib within approximately 1 year, and 40% of these patients have the EGFR T790M and cysteine to serine change at codon 797 (C797S) mutations. Therefore, there is an urgent need for the development of novel treatment strategies for NSCLC patients with the EGFR T790M/C797S mutation. In this study, we identified the EGFR T790M/C797S mutation‐derived peptide (790‐799) (MQLMPFGSLL) that binds the human leukocyte antigen (HLA)‐A*02:01, and successfully established EGFR T790M/C797S‐peptide‐specific CTL clones from human PBMC of HLA‐A2 healthy donors. One established CTL clone demonstrated adequate cytotoxicity against T2 cells pulsed with the EGFR T790M/C797S peptide. This CTL clone also had high reactivity against cancer cells that expressed an endogenous EGFR T790M/C797S peptide using an interferon‐γ (IFN‐γ) enzyme‐linked immunospot (ELISPOT) assay. In addition, we demonstrated using a mouse model that EGFR T790M/C797S peptide‐specific CTL were induced by EGFR T790M/C797S peptide vaccine in vivo. These findings suggest that an immunotherapy targeting a neoantigen derived from EGFR T790M/C797S mutation could be a useful novel therapeutic strategy for NSCLC patients with EGFR‐TKI resistance, especially those resistant to osimertinib.     

Transcriptomic profiles of neoantigen-reactive T cells in human gastrointestinal cancers

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抗人补体膜攻击复合物新抗原单克隆抗体的制备及鉴定

目的　研制针对人补体膜攻击复合物 (MAC)新抗原的特异性单克隆抗体。方法　在兔红细胞表面组装人MAC ,分离纯化RBC膜蛋白。以初步纯化的MAC免疫Balb c小鼠 ,取免疫小鼠脾细胞与SP2 0骨髓瘤细胞融合 ,采用免疫斑点杂交的方法分别以纯化的单一补体成分C5、C6、C7、C8、C9和MAC同时进行阴性和阳性筛选。结果　获得了 2株仅与MAC反应而不与各单体成分反应的单克隆抗体。进一步以体外组装的补体终末复合物进行鉴定 ,证实所获单克隆抗体可特异性识别MAC复合物中C9分子暴露出的新抗原。经ELISA法测定 ,2株杂交瘤细胞的培养上清液和腹水效价分别为 1× 1 0 -3 ,1× 1 0 -3和 1× 1 0 -6,1× 1 0 -7;单克隆抗体的重链均属小鼠IgG1亚类 ,轻链均为κ型。结论　获得了 2株特异性识别MAC新抗原的单克隆抗体。