肺癌细胞的干性及耐药性是重要的恶性指标。ATP结合盒蛋白G超家族成员2(ATP-binding cassette superfamily G member 2,ABCG2)是细胞表面的ATP结合盒蛋白家族的成员之一,依赖ATP可将药物排到细胞外。ABCG2定位于人多种肿瘤细胞的膜上,...肺癌细胞的干性及耐药性是重要的恶性指标。ATP结合盒蛋白G超家族成员2(ATP-binding cassette superfamily G member 2,ABCG2)是细胞表面的ATP结合盒蛋白家族的成员之一,依赖ATP可将药物排到细胞外。ABCG2定位于人多种肿瘤细胞的膜上,它的表达与肿瘤化学治疗多药耐药性紧密相关,目前被认为是肺癌干细胞鉴定的辅助群体标志物。此外,ABCG2的一些单核苷酸多态性与肺癌多药耐药性存在显著相关性。该文就最新ABCG2相关研究进展进行总结和归纳,重点介绍ABCG2基因的表达调控、ABCG2与肺癌干性的关系以及ABCG2的单核苷酸多态性与肺癌耐药性的相关性研究,以期为肺癌患者的临床治疗提供新的策略。展开更多
AIM: APMCF1 is a novel human gene whose transcripts are up-regulated in apoptotic MCF-7 cells. In order to learn more about this gene′s function in other tumors, we cloned its full length cDNA and prepared its polycl...AIM: APMCF1 is a novel human gene whose transcripts are up-regulated in apoptotic MCF-7 cells. In order to learn more about this gene′s function in other tumors, we cloned its full length cDNA and prepared its polyclonal antibody to investigate its expression in colon cancers with immunohistochemistry.METHODS: With the method of 5′ rapid amplification of cDNA end (RACE) and EST assembled in GenBank, we extended the length of APMCF1 at 5′ end. Then the sequence encoding the APMCF1 protein was amplified by RT-PCR from the total RNA of apoptotic MCF-7 cells and cloned into the prokaryotic expression vector pGEX-KG to construct recombinant expression vector pGEX-APMCF1. The GSTAPMCF1 fusion protein was expressed in E. coli and used to immunize rabbits to get the rabbit anti-APMCF1 serum. The specificity of polyclonal anti-APMCF1 antibody was determined by Western blot. Then we investigated the expression of Apmcf1 in colon cancers and normal colonic mucosa with immunohistochemistry.RESULTS: A cDNA fragment with a length of 1 745 bp was obtained. APMCF1 was mapped to chromosome 3q22.2and spanned at least 14.8 kb of genomic DNA with seven exons and six introns contained. Bioinformatic analysis showed the protein encoded by APMCF1 contained a small GTP-binding protein (G proteins) domain and was homologous to mouse signal recognition particle receptor β(SRβ). A coding region covering 816 bp was cloned and polyclonal anti-APMCF1 antibody was prepared successfully.The immunohistochemistry study showed that APMCF1 had a strong expression in colon cancer.CONCLUSION: APMCF1 may be the gene coding human signal recognition particle receptor β and belongs to the small-G protein superfamily. Its strong expression pattern in colon cancer suggests it may play a role in colon cancer development.展开更多
文摘肺癌细胞的干性及耐药性是重要的恶性指标。ATP结合盒蛋白G超家族成员2(ATP-binding cassette superfamily G member 2,ABCG2)是细胞表面的ATP结合盒蛋白家族的成员之一,依赖ATP可将药物排到细胞外。ABCG2定位于人多种肿瘤细胞的膜上,它的表达与肿瘤化学治疗多药耐药性紧密相关,目前被认为是肺癌干细胞鉴定的辅助群体标志物。此外,ABCG2的一些单核苷酸多态性与肺癌多药耐药性存在显著相关性。该文就最新ABCG2相关研究进展进行总结和归纳,重点介绍ABCG2基因的表达调控、ABCG2与肺癌干性的关系以及ABCG2的单核苷酸多态性与肺癌耐药性的相关性研究,以期为肺癌患者的临床治疗提供新的策略。
文摘目的:探讨不同分子靶向药物对高表达与低表达ATP结合转运蛋白G超家族成员2(ATP-binding cassette super-family Gmember 2,ABCG2)的人耐药鼻咽癌CNE2/DDP细胞(分别简写为ABCG2highCNE2/DDP和ABCG2lowCNE2/DDP)表面NKG2D配体(natural killer group 2 member Dligands,NKG2DLs)表达的诱导作用及其对NK细胞杀伤敏感性的影响。方法:免疫磁珠法分选ABCG2highCNE2/DDP、ABCG2lowCNE2/DDP细胞及NK细胞。流式细胞术检测分选细胞的纯度和不同分子靶向药物(硼替佐米、索拉非尼、舒尼替尼)处理前后ABCG2highCNE2/DDP和ABCG2lowCNE2/DDP细胞NKG2DLs的表达率。LDH释放法检测不同药物处理前后ABCG2highCNE2/DDP和ABCG2lowCNE2/DDP细胞对NK细胞杀伤的敏感性。结果:ABCG2highCNE2/DDP和ABCG2lowCNE2/DDP细胞表面ABCG2的表达率分别为(91.40±2.32)%和(1.70±0.24)%。分选后NK细胞中CD3-CD16+CD56+细胞的比例达90%以上。药物处理前,ABCG2highCNE2/DDP和ABCG2lowCNE2/DDP细胞MICA、MICB、ULBP1、ULBP2和ULBP3呈弱表达;经不同分子靶向药物处理后,5种NKG2DLs的表达率均明显上升(P<0.01),以舒尼替尼处理后NKG2DLs的表达率升高最明显。随着NKG2DLs表达的上调,ABCG2highCNE2/DDP和ABCG2lowCNE2/DDP细胞对NK细胞杀伤的敏感性也随之升高。结论:不同分子靶向药物可诱导耐药鼻咽癌CNE2/DDP细胞NKG2DLs的表达,以舒尼替尼的诱导作用最强,且肿瘤细胞NKG2DLs的表达与其对NK细胞杀伤敏感性之间存在线性关系。
基金National Natural Science Foundation of China,No.30270667
文摘AIM: APMCF1 is a novel human gene whose transcripts are up-regulated in apoptotic MCF-7 cells. In order to learn more about this gene′s function in other tumors, we cloned its full length cDNA and prepared its polyclonal antibody to investigate its expression in colon cancers with immunohistochemistry.METHODS: With the method of 5′ rapid amplification of cDNA end (RACE) and EST assembled in GenBank, we extended the length of APMCF1 at 5′ end. Then the sequence encoding the APMCF1 protein was amplified by RT-PCR from the total RNA of apoptotic MCF-7 cells and cloned into the prokaryotic expression vector pGEX-KG to construct recombinant expression vector pGEX-APMCF1. The GSTAPMCF1 fusion protein was expressed in E. coli and used to immunize rabbits to get the rabbit anti-APMCF1 serum. The specificity of polyclonal anti-APMCF1 antibody was determined by Western blot. Then we investigated the expression of Apmcf1 in colon cancers and normal colonic mucosa with immunohistochemistry.RESULTS: A cDNA fragment with a length of 1 745 bp was obtained. APMCF1 was mapped to chromosome 3q22.2and spanned at least 14.8 kb of genomic DNA with seven exons and six introns contained. Bioinformatic analysis showed the protein encoded by APMCF1 contained a small GTP-binding protein (G proteins) domain and was homologous to mouse signal recognition particle receptor β(SRβ). A coding region covering 816 bp was cloned and polyclonal anti-APMCF1 antibody was prepared successfully.The immunohistochemistry study showed that APMCF1 had a strong expression in colon cancer.CONCLUSION: APMCF1 may be the gene coding human signal recognition particle receptor β and belongs to the small-G protein superfamily. Its strong expression pattern in colon cancer suggests it may play a role in colon cancer development.
