BACKGROUND Long non-coding RNAs(lncRNAs) have been shown to be associated with many tumors. However, the specific mechanism of lncRNAs in the occurrence and development of gastric cancer(GC) has not been fully elucida...BACKGROUND Long non-coding RNAs(lncRNAs) have been shown to be associated with many tumors. However, the specific mechanism of lncRNAs in the occurrence and development of gastric cancer(GC) has not been fully elucidated.AIM To explore the expression level and molecular mechanism of HOXD-AS2 in GC tissues and cells, and analyze its significance in the prognosis of GC.METHODS Real-time quantitative PCR was used to detect the expression of HOXD-AS2 in 79 pairs of GC tissues and five cell lines. The pc HOXD-AS2 plasmid vector was constructed and transfected into SGC-7901 and SNU-1 GC cells. Matrigel Transwell and wound healing assays were used to confirm the effect of HOXDAS2 on invasion and migration of GC cells. Cell counting kit-8 assay and flow cytometry were used to verify the effect of HOXD-AS2 on the proliferation, cell cycle, and apoptosis of GC cells. The relevant regulatory mechanism between HOXD-AS2 and HOXD8 and PI3K/Akt signaling pathway was verified by Western blot analysis.RESULTS The low expression of lncRNA HOXD-AS2 was associated with lymph node metastasis and tumor-node-metastasis stage in GC. In vitro functional experiments demonstrated that overexpression of HOXD-AS2 inhibited GC cell progression. Mechanistic studies revealed that HOXD-AS2 regulated the expression of its nearby gene HOXD8 and inhibited the activity of the PI3K/Akt signaling pathway.CONCLUSION These results indicate that downregulation of HOXD-AS2 significantly promotes the progression of GC cells by regulating HOXD8 expression and activating the PI3K/Akt signaling pathway. HOXD-AS2 may be a novel diagnostic biomarker and effective therapeutic target for GC.展开更多
目的:探讨HOXD3表达对乳腺癌细胞干性的影响,并研究HOXD3表达与乳腺癌细胞化疗耐药的关系。方法:收集2006年1月至2008年12月哈尔滨医科大学附属肿瘤医院87例乳腺癌患者组织标本。采用免疫组织化学染色法检测乳腺癌细胞和组织中HOXD3表达...目的:探讨HOXD3表达对乳腺癌细胞干性的影响,并研究HOXD3表达与乳腺癌细胞化疗耐药的关系。方法:收集2006年1月至2008年12月哈尔滨医科大学附属肿瘤医院87例乳腺癌患者组织标本。采用免疫组织化学染色法检测乳腺癌细胞和组织中HOXD3表达;采用RT-PCR、Western blot和免疫荧光染色法检测HOXD3在顺铂或阿霉素耐药细胞系MDA-MB-231和MDA-MB-435中的表达水平,分析HOXD3过表达对乳腺癌细胞系MDA-MB-231和MDA-MB-435的干细胞生物标志物表达水平的影响;采用MTT法和集落形成实验分析HOXD3在乳腺癌细胞化疗耐药中的作用。结果:乳腺癌组织中HOXD3 m RNA相对表达量显著高于癌旁正常组织,乳腺癌细胞系MDA-MB-231、MDA-MB-435和MCF-7的HOXD3 m RNA相对表达量均高于正常乳腺上皮细胞系MCF-10A(均P<0.05)。顺铂或阿霉素耐药的细胞系MDA-MB-231和MDA-MB-435的半抑制浓度(half maximal inhibi-tory concentration,IC50)分别为(20.82±0.05)μmol/L和(19.69±0.47)μmol/L,或(32.26±0.23)mmol/L和(26.08±0.55)mmol/L,均高于对应原始细胞系(均P<0.05);耐药倍数分别为2.47和3.10倍,或1.86和2.08倍。HOXD3过表达MDA-MB-231、MDA-MB-435的肿瘤球体数目、干细胞生物标志物的表达水平均明显增加(均P<0.05)。结论:HOXD3过表达对乳腺癌细胞干性的维持及化疗耐药性的发生发挥重要的作用,为制定针对肿瘤干细胞的分子靶向治疗提供理论参考。展开更多
基金National Natural Science Foundation of China,No. 30700773,No. 81070378,and No. 81270561Sichuan Outstanding Youth Fund Project,No. 2015JQ0060。
文摘BACKGROUND Long non-coding RNAs(lncRNAs) have been shown to be associated with many tumors. However, the specific mechanism of lncRNAs in the occurrence and development of gastric cancer(GC) has not been fully elucidated.AIM To explore the expression level and molecular mechanism of HOXD-AS2 in GC tissues and cells, and analyze its significance in the prognosis of GC.METHODS Real-time quantitative PCR was used to detect the expression of HOXD-AS2 in 79 pairs of GC tissues and five cell lines. The pc HOXD-AS2 plasmid vector was constructed and transfected into SGC-7901 and SNU-1 GC cells. Matrigel Transwell and wound healing assays were used to confirm the effect of HOXDAS2 on invasion and migration of GC cells. Cell counting kit-8 assay and flow cytometry were used to verify the effect of HOXD-AS2 on the proliferation, cell cycle, and apoptosis of GC cells. The relevant regulatory mechanism between HOXD-AS2 and HOXD8 and PI3K/Akt signaling pathway was verified by Western blot analysis.RESULTS The low expression of lncRNA HOXD-AS2 was associated with lymph node metastasis and tumor-node-metastasis stage in GC. In vitro functional experiments demonstrated that overexpression of HOXD-AS2 inhibited GC cell progression. Mechanistic studies revealed that HOXD-AS2 regulated the expression of its nearby gene HOXD8 and inhibited the activity of the PI3K/Akt signaling pathway.CONCLUSION These results indicate that downregulation of HOXD-AS2 significantly promotes the progression of GC cells by regulating HOXD8 expression and activating the PI3K/Akt signaling pathway. HOXD-AS2 may be a novel diagnostic biomarker and effective therapeutic target for GC.
文摘目的:探讨HOXD3表达对乳腺癌细胞干性的影响,并研究HOXD3表达与乳腺癌细胞化疗耐药的关系。方法:收集2006年1月至2008年12月哈尔滨医科大学附属肿瘤医院87例乳腺癌患者组织标本。采用免疫组织化学染色法检测乳腺癌细胞和组织中HOXD3表达;采用RT-PCR、Western blot和免疫荧光染色法检测HOXD3在顺铂或阿霉素耐药细胞系MDA-MB-231和MDA-MB-435中的表达水平,分析HOXD3过表达对乳腺癌细胞系MDA-MB-231和MDA-MB-435的干细胞生物标志物表达水平的影响;采用MTT法和集落形成实验分析HOXD3在乳腺癌细胞化疗耐药中的作用。结果:乳腺癌组织中HOXD3 m RNA相对表达量显著高于癌旁正常组织,乳腺癌细胞系MDA-MB-231、MDA-MB-435和MCF-7的HOXD3 m RNA相对表达量均高于正常乳腺上皮细胞系MCF-10A(均P<0.05)。顺铂或阿霉素耐药的细胞系MDA-MB-231和MDA-MB-435的半抑制浓度(half maximal inhibi-tory concentration,IC50)分别为(20.82±0.05)μmol/L和(19.69±0.47)μmol/L,或(32.26±0.23)mmol/L和(26.08±0.55)mmol/L,均高于对应原始细胞系(均P<0.05);耐药倍数分别为2.47和3.10倍,或1.86和2.08倍。HOXD3过表达MDA-MB-231、MDA-MB-435的肿瘤球体数目、干细胞生物标志物的表达水平均明显增加(均P<0.05)。结论:HOXD3过表达对乳腺癌细胞干性的维持及化疗耐药性的发生发挥重要的作用,为制定针对肿瘤干细胞的分子靶向治疗提供理论参考。
