RESUMO
OBJECTIVE: Emerging evidence has suggested that dysregulation of miR-874-3p may be involved in tumor development and progression in various types of cancers. However, its expression and biological function in esophageal squamous cell carcinoma (ESCC) remains unclear. The aim of this study was to explore the roles of miR-874-3p in ESCC tumorigenesis and development. PATIENTS AND METHODS: Quantitative Real Time-PCR was used to detect the expression of related mRNAs and miRNA in both ESCC tissues and cells. Then, statistical analysis was performed to determine the associations of miR-874-3p expression with the clinical features and the prognosis of ESCC. Cells proliferation and metastasis were assessed by cell viability assay and transwell assay. Luciferase reporter assays and Western blot were performed to analyze the regulation of putative target of miR-874-3p. RESULTS: We found that the expressions of miR-874-3p in ESCC tissues and cell lines were much lower than that in normal control, respectively. Also, there is a statistically significance between miR-874-3p expression level and lymph nodes metastasis and clinical stage. Kaplan-Meier analysis showed that decreased miR-874-3p expression was associated with poor overall survival of patients. Multivariate Cox regression analysis showed that the expression of miR-874-3p was an independent prognostic factor for ESCC patients. After miR-874-3p mimics transfection, cell proliferation, migration, and invasion were significantly suppressed in the ESCC cells. Mechanistically, STAT3 was confirmed to be the downstream target of miR-874-3p in ESCC cells. CONCLUSIONS: We indicate that miR-874-3p could be a new therapeutic target and prognostic marker of ESCC.
Assuntos
Neoplasias Esofágicas/metabolismo , Carcinoma de Células Escamosas do Esôfago/metabolismo , MicroRNAs/metabolismo , Fator de Transcrição STAT3/metabolismo , Adulto , Idoso , Linhagem Celular Tumoral , Movimento Celular , Proliferação de Células , Neoplasias Esofágicas/genética , Neoplasias Esofágicas/mortalidade , Neoplasias Esofágicas/patologia , Carcinoma de Células Escamosas do Esôfago/genética , Carcinoma de Células Escamosas do Esôfago/mortalidade , Carcinoma de Células Escamosas do Esôfago/secundário , Feminino , Regulação Neoplásica da Expressão Gênica , Humanos , Masculino , MicroRNAs/genética , Pessoa de Meia-Idade , Invasividade Neoplásica , Prognóstico , Fatores de Risco , Fator de Transcrição STAT3/genética , Transdução de SinaisRESUMO
OBJECTIVE: MicroRNAs (miRNAs) have been reported to play important roles in the progression of breast cancer (BC). In the present study, we aimed to explore the association between miR-597 expression level and prognosis of BC. PATIENTS AND METHODS: The expression levels of miR-597 were measured using quantitative Real-time polymerase chain reaction (qRT-PCR) analysis. The association between miR-597 expression and clinicopathological factors was analyzed. Differences in BC patient survival were determined using the Kaplan-Meier method and log-rank test. The prognostic value of miR-597 was further verified using the Cox proportional hazards regression model. RESULTS: Our data indicated that miR-597 was lowly expressed in BC compared with adjacent non-malignant tissues (p<0.001). Low miR-597 expression was observed to be closely associated with positive lymph node metastasis (p=0.001), higher TNM stage (p = 0.003), and poorer pathological differentiation (p=0.006). Furthermore, patients with lower levels of miR-597 expression had a shorter overall survival time than patients with higher miR-597 expression levels (p=0.009). In addition, multivariate Cox proportional hazards model analysis confirmed that miR-597 was an independent prognostic indicator of overall survival (p=0.005; HR 2.273; CI 95%, 1.117-4.291). CONCLUSIONS: We showed, for the first time, that decreased miR-597 expression suggested unfavorable prognosis for BC patients.
