Our previous study demonstrated that human KIAA0100 gene was a novel acute monocytic leukemia-associated antigen (MLAA) gene. But the functional characterization of human KIAA0100 gene has remained unknown to date. He...Our previous study demonstrated that human KIAA0100 gene was a novel acute monocytic leukemia-associated antigen (MLAA) gene. But the functional characterization of human KIAA0100 gene has remained unknown to date. Here, firstly, bioinformatic prediction of human KIAA0100 gene was carried out using online softwares; Secondly, Human KIAA0100 gene expression was downregulated by the clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated (Cas) 9 system in U937 cells. Cell proliferation and apoptosis were next evaluated in KIAA0100-knockdown U937 cells. The bioinformatic prediction showed that human KIAA0100 gene was located on 17q11.2, and human KIAA0100 protein was located in the secretory pathway. Besides, human KIAA0100 protein contained a signalpeptide, a transmembrane region, three types of secondary structures (alpha helix, extended strand, and random coil) , and four domains from mitochondrial protein 27 (FMP27). The observation on functional characterization of human KIAA0100 gene revealed that its downregulation inhibited cell proliferation, and promoted cell apoptosis in U937 cells. To summarize, these results suggest human KIAA0100 gene possibly comes within mitochondrial genome; moreover, it is a novel anti-apoptotic factor related to carcinogenesis or progression in acute monocytic leukemia, and may be a potential target for immunotherapy against acute monocytic leukemia.展开更多
目的:探索体外扩增白血病肿瘤相关抗原特异性细胞毒T细胞(tumor-associated antigen-specific cytotoxic T lymphocytes,TAA-CTL)的可行性,并验证其特异性杀伤作用。方法:采用密度梯度离心法分离出健康志愿者外周血单个核细胞,诱导培养...目的:探索体外扩增白血病肿瘤相关抗原特异性细胞毒T细胞(tumor-associated antigen-specific cytotoxic T lymphocytes,TAA-CTL)的可行性,并验证其特异性杀伤作用。方法:采用密度梯度离心法分离出健康志愿者外周血单个核细胞,诱导培养树突状细胞(dendritic cells,DC)并负载白血病相关抗原WT1、PRAME、NY-ESO-1混合多肽,然后与自体T淋巴细胞共培育,扩增出TAA-CTL。用流式细胞术检测TAA-CTL表型及多种细胞因子的分泌率,细胞毒实验检测TAA-CTL对负载肿瘤相关抗原的自体靶细胞的杀伤力。结果:1体外诱导培养的TAACTL扩增倍数为3.81±1.61;流式细胞术检测其中CD3+细胞平均为(97.22±0.71)%,CD3+CD4+占(41.47±27.08)%,CD3+CD8+占(56.40±11.15)%,CD3-CD56+占(0.50±0.31)%,CD19+仅占(0.14±0.20)%,与对照组细胞表型分析比较差异无统计学意义(P>0.05)。2流式细胞术检测经抗原刺激后TAA-CTL分泌的胞内细胞因子,CD8+TAA-CTL分泌的IFN-γ和TNF-α水平分别为(27.67±2.21)%和(34.2±0.71)%,CD4+TAA-CTL分泌的IFN-γ和TNF-α分别为(21.6±2.55)%和(9.97±3.44)%;对照组CD8+CTL分泌的IFN-γ和TNF-α水平分别为(1.36±0.04)%和(5.58±0.03)%,CD4+CTL分泌的IFN-γ和TNF-α分别为(0.91±0.06)%和(1.60±0.07)%,均明显低于TAA-CTL组,其差异有统计学意义(P<0.01)。TAA-CTL在效靶比为5∶1、10∶1、20∶1和40∶1时对负载TAA的自体靶细胞的杀伤率分别为(26.85±5.25)%、(60.55±2.45)%、(67.4±3.60)%和(77.00±1.00)%,对未负载TAA的自体靶细胞未见明显杀伤作用(P<0.05)。结论:来源于健康志愿者的外周血单个核细胞体外可以成功诱导扩增出TAA-CTL并具有特异性杀伤功能。展开更多
基金financial support from the National Natural Science Foundation of China (No. 081718110232)
文摘Our previous study demonstrated that human KIAA0100 gene was a novel acute monocytic leukemia-associated antigen (MLAA) gene. But the functional characterization of human KIAA0100 gene has remained unknown to date. Here, firstly, bioinformatic prediction of human KIAA0100 gene was carried out using online softwares; Secondly, Human KIAA0100 gene expression was downregulated by the clustered regularly interspaced short palindromic repeats (CRISPR)/CRISPR-associated (Cas) 9 system in U937 cells. Cell proliferation and apoptosis were next evaluated in KIAA0100-knockdown U937 cells. The bioinformatic prediction showed that human KIAA0100 gene was located on 17q11.2, and human KIAA0100 protein was located in the secretory pathway. Besides, human KIAA0100 protein contained a signalpeptide, a transmembrane region, three types of secondary structures (alpha helix, extended strand, and random coil) , and four domains from mitochondrial protein 27 (FMP27). The observation on functional characterization of human KIAA0100 gene revealed that its downregulation inhibited cell proliferation, and promoted cell apoptosis in U937 cells. To summarize, these results suggest human KIAA0100 gene possibly comes within mitochondrial genome; moreover, it is a novel anti-apoptotic factor related to carcinogenesis or progression in acute monocytic leukemia, and may be a potential target for immunotherapy against acute monocytic leukemia.
