RESUMO
PURPOSE: MicroRNA (miR)-194-5p is downregulated in bladder cancer (BC), but its role in BC has not been determined mechanistically. METHODS: The expression levels of miR-194-5p and E2F transcription factor 3 (E2F3) were determined by means of quantitative reverse transcription and polymerase chain reaction in BC specimens. In addition, T24 BC cells were transfected with a miR-194-5p mimic, a miR-194-5p inhibitor, or E2F3 small interfering (si)RNA, and the level of E2F3 protein expressed by these cells was assessed by western blotting. A dual luciferase reporter assay was applied to verify the binding site between miR-194-5p and the 3' untranslated region of E2F3. Transwell assays were performed to examine cell migration and invasion. RESULTS: Dysregulation of miR-194-5p in BC was closely associated with node metastasis and differentiation. In BC specimens and cell lines, miR-194-5p mRNA was downregulated, while E2F3 mRNA was upregulated. Overexpression of miR-194-5p suppressed the expression of E2F3 mRNA and protein. By regulating E2F3, miR-194-5p inhibited cell migration and invasion in BC. Treatment of BC cells with E2F3 siRNA had the same effect as did overexpression of miR-194-5p. CONCLUSIONS: MiR-194-5p directly targets E2F3 and inhibits cell migration and invasion in BC.
Assuntos
Fator de Transcrição E2F3/metabolismo , MicroRNAs/metabolismo , Neoplasias da Bexiga Urinária/genética , Neoplasias da Bexiga Urinária/metabolismo , Movimento Celular/fisiologia , Regulação para Baixo , Fator de Transcrição E2F3/antagonistas & inibidores , Fator de Transcrição E2F3/biossíntese , Fator de Transcrição E2F3/genética , Humanos , MicroRNAs/biossíntese , MicroRNAs/genética , Invasividade Neoplásica , Transfecção , Neoplasias da Bexiga Urinária/patologiaRESUMO
LncRNA colon cancer-associated transcript 2 (CCAT2) was firstly discovered and found overexpressed in colorectal cancer, and identified as is oncogenic lncRNA. However, the significance of CCAT2 in small cell lung cancer (SCLC) remains unclear. The expression of CCAT2 in SCLC tissues and cell lines was detected, and the association between CCAT2 expression and clinicopathological factors was analyzed. Cell proliferation and invasion assays were conducted by using SCLC cell lines transfected with CCAT2-siRNA or NC-siRNA. In our results, CCAT2 expression was elevated in SCLC tissues and cell lines, and correlated with malignant status and poor prognosis of SCLC patients. Furthermore, knockdown of CCAT2 expression effectively suppressed SCLC cell growth and metastasis in vitro. In conclusion, CCAT2 serves as an oncogenic lncRNA, and an independent unfavorable prognostic factor in SCLC patients.
Assuntos
Neoplasias Pulmonares/genética , Neoplasias Pulmonares/patologia , RNA Longo não Codificante/genética , Carcinoma de Pequenas Células do Pulmão/genética , Carcinoma de Pequenas Células do Pulmão/patologia , Linhagem Celular Tumoral , Proliferação de Células , Progressão da Doença , Feminino , Regulação Neoplásica da Expressão Gênica , Técnicas de Silenciamento de Genes , Humanos , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Metástase Neoplásica , Prognóstico , Modelos de Riscos Proporcionais , RNA Longo não Codificante/metabolismoRESUMO
Polycystic ovary syndrome (PCOS) is a common endocrine and metabolic disorder in women and is characterised by polycystic ovaries, hyperandrogenism and chronic anovulation. Although the clinical and biochemical signs of PCOS are typically heterogeneous, abnormal folliculogenesis is considered a common characteristic of PCOS. Our aim is to identify the altered miRNA and mRNA expression profiles in the cumulus cells of PCOS patients to investigate their molecular function in the aetiology and pathophysiology of PCOS. In this study, the miRNA expression profiles of the cumulus cell samples isolated from five PCOS and five control patients were determined by an miRNA microarray. At the same time, the altered mRNA profiles of the same cumulus cell samples were also identified by a cDNA microarray. From the microarray data, 17 miRNAs and 1263 mRNAs showed significantly different expression in the PCOS cumulus cells. The differentially expressed miRNA-509-3p and its potential target gene (MAP3K8) were identified from the miRNA and mRNA microarrays respectively. The expression of miRNA-509-3p was up-regulated and MAP3K8 was down-regulated in the PCOS cumulus cells. The direct interaction between miRNA-509-3p and MAP3K8 was confirmed by a luciferase activity assay in KGN cells. In addition, miRNA-509-3p mimics or inhibitor transfection tests in KGN cells further confirmed that miRNA-509-3p improved oestradiol (E2) secretion by inhibiting the expression of MAP3K8 These results help to characterise the pathogenesis of anovulation in PCOS, especially the regulation of E2 production.
