AIM:To study the correlation between high metastasisassociated protein 1(MTA1)expression and lymphangiogenesis in colorectal cancer(CRC)and its role in production of vascular endothelial growth factor-C(VEGF-C). METHO...AIM:To study the correlation between high metastasisassociated protein 1(MTA1)expression and lymphangiogenesis in colorectal cancer(CRC)and its role in production of vascular endothelial growth factor-C(VEGF-C). METHODS:Impact of high MTA1 and VEGF-C expression levels on disease progression and lymphovasculardensity(LVD,D2-40-immunolabeled)in 81 cases of human CRC was evaluated by immunohistochemistry. VEGF-C mRNA and protein expressions in human LoVo and HCT116 cell lines were detected by real-time polymerase chain reaction and Western blotting,respectively,with a stable expression vector or siRNA. RESULTS:The elevated MTA1 and VEGF-C expression levels were correlated with lymph node metastasis and Dukes stages(P<0.05).Additionally,high MTA1 expression level was correlated with a large tumor size(P< 0.05).A significant correlation was found between MTA1 and VEGF-C protein expressions in tumor cells(r=0.371, P<0.05).Similar to the VEGF-C expression level,high MTA1 expression level was correlated with high LVD in CRC(P<0.05).Furthermore,over-expression of MTA1 significantly enhanced the VEGF-C mRNA and protein expression levels,whereas siRNAs-knocked down MTA1 decreased the VEGF-C expression level. CONCLUSION:MTA1,as a regulator of tumor-associated lymphangiogenesis,promotes lymphangiogenesis in CRC by mediating the VEGF-C expression.展开更多
Aim： To investigate the stage-specific localization of metastasis-associated protein 1 （MTA1） during spermatogenesis in adult human and mouse testis. Methods： The immunolocalization of MTA1 was studied by immunohi...Aim： To investigate the stage-specific localization of metastasis-associated protein 1 （MTA1） during spermatogenesis in adult human and mouse testis. Methods： The immunolocalization of MTA1 was studied by immunohistochemistry and Western blot analysis. The distribution pattern of MTA1 in mouse testis was confirmed by using quantitative analysis of purified spermatogenic cells. Results： The specificity of polyclonal antibody was confirmed by Western blot analysis. MTA1 was found expressed in the nucleus of germ cells, except elongate spermatids, and in the cytoplasm of Sertoli cells; Leydig cells did not show any specific reactivity. MTA1 possessed different distribution patterns in the two species： in humans, the most intensive staining was found in the nucleus of round spermatids and of primary spermatocytes while in mice, the most intense MTA 1 staining was in the nucleus of leptotene, zygotene and pachytene spermatocytes. In both species the staining exhibited a cyclic pattern. Conclusion： The present communication initially provides new evidence for the potential role of MTA1 in mature testis. In addition, its distinctive expression in germ cells suggests a regulatory role of the peptide during spermatogenesis.展开更多
文摘目的观察敲降长链非编码RNA-肺腺癌转移相关转录因子1(lncRNA-MALAT1)调控微小RNA-194-5p(miR-194-5p)/叉头框蛋白A1(FOXA1)通路对脂多糖(LPS)诱导的人肺泡上皮细胞(HPAEpiC)凋亡的影响.方法采用1 mg/L LPS处理HPAEpiC复制脓毒症急性肺损伤(ALI)体外模型.采用荧光定量聚合酶链反应(qPCR)检测HPAEpiC细胞中MALAT1、miR-194-5p的表达水平,构建MALAT1敲降载体、miR-194-5p抑制剂及FOXA1抑制剂转染HPAEpiC,将细胞分为空白对照组、LPS模型组、LPS+生理盐水组、LPS+MALAT1抑制剂组、LPS+MALAT1抑制剂+生理盐水组、LPS+MALAT1抑制剂+miR-194-5p抑制剂组和LPS+FOXA1抑制剂组.采用CCK-8细胞增殖及毒性检测试剂盒、流式细胞术、蛋白质免疫印迹试验(Western Blot)检测MALAT1或其敲降后对LPS诱导的HPAEpiC增殖及凋亡和FOXA1表达的影响;采用双荧光素酶报告基因检测lncRNA-MALAT1、miR-194-5p及FOXA1的靶向调控关系.结果与空白对照组比较,LPS可上调HPAEpiC-MALAT1的表达,促进HPAEpiC凋亡并抑制其增殖〔MALAT1(2^(-ΔΔCt)):0.83±0.09比0.15±0.02,HPAEpiC凋亡率:(21.31±2.31)%比(5.41±0.42)%,24 h HPAEpiC增殖活性(A值):0.42±0.03比0.54±0.02,均P<0.05〕;与LPS+生理盐水组比较,敲降MALAT1可抑制LPS诱导的HPAEpiC凋亡并促进其增殖〔细胞凋亡率:(6.40±0.40)%比(21.38±2.31)%,24 h HPAEpiC增殖活性(A值):0.53±0.03比0.40±0.02,均P<0.05〕,降低MALAT1的表达(2-ΔΔCt:0.20±0.03比1.02±0.09,P<0.05).双荧光素酶报告基因及Western Blot证实,敲降MALAT1通过靶向上调miR-194-5p从而抑制FOXA1在LPS诱导的HPAEpiC中的表达〔miR-194-5p(2^(-ΔΔCt)):5.27±0.15比1.21±0.09,FOXA1蛋白表达(灰度值):0.36±0.05比1.00±0.07,均P<0.05〕,miR-194-5p抑制剂能逆转MALAT1敲降在LPS诱导的HPAEpiC中对FOXA1的作用〔FOXA1蛋白表达(灰度值):2.76±0.20比1.00±0.07,P<0.05〕,抑制FOXA1表达能减轻LPS诱导的HPAEpiC凋亡并促进其增殖〔FOXA1蛋白表达(灰度值):0.28±0.03比1.00±0.03,HPA
基金Supported by National Natural Science Foundation of China(No.30772131)Fundamental Research Funds for Central Universities(No.21609313)from Ministry of Education of China
文摘AIM:To study the correlation between high metastasisassociated protein 1(MTA1)expression and lymphangiogenesis in colorectal cancer(CRC)and its role in production of vascular endothelial growth factor-C(VEGF-C). METHODS:Impact of high MTA1 and VEGF-C expression levels on disease progression and lymphovasculardensity(LVD,D2-40-immunolabeled)in 81 cases of human CRC was evaluated by immunohistochemistry. VEGF-C mRNA and protein expressions in human LoVo and HCT116 cell lines were detected by real-time polymerase chain reaction and Western blotting,respectively,with a stable expression vector or siRNA. RESULTS:The elevated MTA1 and VEGF-C expression levels were correlated with lymph node metastasis and Dukes stages(P<0.05).Additionally,high MTA1 expression level was correlated with a large tumor size(P< 0.05).A significant correlation was found between MTA1 and VEGF-C protein expressions in tumor cells(r=0.371, P<0.05).Similar to the VEGF-C expression level,high MTA1 expression level was correlated with high LVD in CRC(P<0.05).Furthermore,over-expression of MTA1 significantly enhanced the VEGF-C mRNA and protein expression levels,whereas siRNAs-knocked down MTA1 decreased the VEGF-C expression level. CONCLUSION:MTA1,as a regulator of tumor-associated lymphangiogenesis,promotes lymphangiogenesis in CRC by mediating the VEGF-C expression.
基金We are grateful to Prof. Rui-An Wang （Department of Molecular and Cellular 0ncology, the University of Texas MD Anderson Cancer Center, Houston, TX, USA） for his helpful advice and discussion regarding the pos- sible functions of MTA1. We also thank Miss Hui Wang for her careful assistance in English. This study was supported by the Natural Science Foundation of China （2006： No. 30570982 2003： No. 30370750 2003： No. 30371584）.
文摘Aim： To investigate the stage-specific localization of metastasis-associated protein 1 （MTA1） during spermatogenesis in adult human and mouse testis. Methods： The immunolocalization of MTA1 was studied by immunohistochemistry and Western blot analysis. The distribution pattern of MTA1 in mouse testis was confirmed by using quantitative analysis of purified spermatogenic cells. Results： The specificity of polyclonal antibody was confirmed by Western blot analysis. MTA1 was found expressed in the nucleus of germ cells, except elongate spermatids, and in the cytoplasm of Sertoli cells; Leydig cells did not show any specific reactivity. MTA1 possessed different distribution patterns in the two species： in humans, the most intensive staining was found in the nucleus of round spermatids and of primary spermatocytes while in mice, the most intense MTA 1 staining was in the nucleus of leptotene, zygotene and pachytene spermatocytes. In both species the staining exhibited a cyclic pattern. Conclusion： The present communication initially provides new evidence for the potential role of MTA1 in mature testis. In addition, its distinctive expression in germ cells suggests a regulatory role of the peptide during spermatogenesis.
