BACKGROUND: MicroRNAs regulate gene expression at the posttranscriptional level and play important roles in tumor development, progression, and metastasis. The aim of this study was to investigate the role of microRNA-92a (miR-92a) in metastasis of colorectal cancer (CRC). METHODS: One hundred fifty-eight CRC patients were enrolled. The expression of miR-92a, PTEN, and E-cadherin was analyzed by real-time PCR. Univariate (Kaplan-Meier) analysis was used to analyze primary outcomes included 5-year overall survival and tumor recurrence. CRC cell model studies were used to analyze the miR-92a-involved CRC metastasis. RESULTS: The expression of miR-92a in tumor tissues was significantly positively correlated with lymph node metastasis in CRC patients (p = 0.012). After adjusting for age, sex, and disease differentiation, this correlation remained significant (p = 0.01). In addition, there was a negative correlation between levels of miR-92a and the PTEN gene (p < 0.0001). No any association of miR-92a and E-cadherin was found (p = 0.128). Patients with high miR-92a/low PTEN had poorer overall survival and disease-free survival rates than those with high miR-92a/high PTEN, low miR-92a/high PTEN, and low miR-92a/low PTEN. The association of levels of miR-92a and PTEN with tumor cell migration in CRC was also confirmed in CRC cell models. CONCLUSIONS: We suggest that miR-92a is involved in lymph node metastasis of CRC patients through PTEN-regulated PI3K/AKT signaling pathway.
BACKGROUND: MicroRNAs regulate gene expression at the posttranscriptional level and play important roles in tumor development, progression, and metastasis. The aim of this study was to investigate the role of microRNA-92a (miR-92a) in metastasis of colorectal cancer (CRC). METHODS: One hundred fifty-eight CRC patients were enrolled. The expression of miR-92a, PTEN, and E-cadherin was analyzed by real-time PCR. Univariate (Kaplan-Meier) analysis was used to analyze primary outcomes included 5-year overall survival and tumor recurrence. CRC cell model studies were used to analyze the miR-92a-involved CRC metastasis. RESULTS: The expression of miR-92a in tumor tissues was significantly positively correlated with lymph node metastasis in CRC patients (p = 0.012). After adjusting for age, sex, and disease differentiation, this correlation remained significant (p = 0.01). In addition, there was a negative correlation between levels of miR-92a and the PTEN gene (p < 0.0001). No any association of miR-92a and E-cadherin was found (p = 0.128). Patients with high miR-92a/low PTEN had poorer overall survival and disease-free survival rates than those with high miR-92a/high PTEN, low miR-92a/high PTEN, and low miR-92a/low PTEN. The association of levels of miR-92a and PTEN with tumor cell migration in CRC was also confirmed in CRC cell models. CONCLUSIONS: We suggest that miR-92a is involved in lymph node metastasis of CRC patients through PTEN-regulated PI3K/AKT signaling pathway.
Authors: Keren Regev; Brian C Healy; Fariha Khalid; Anu Paul; Renxin Chu; Shahamat Tauhid; Subhash Tummala; Camilo Diaz-Cruz; Radhika Raheja; Maria A Mazzola; Felipe von Glehn; Pia Kivisakk; Sheena L Dupuy; Gloria Kim; Tanuja Chitnis; Howard L Weiner; Roopali Gandhi; Rohit Bakshi Journal: JAMA Neurol Date: 2017-03-01 Impact factor: 18.302
Authors: Manasvi S Shah; Eunjoo Kim; Laurie A Davidson; Jason M Knight; Roger S Zoh; Jennifer S Goldsby; Evelyn S Callaway; Beyian Zhou; Ivan Ivanov; Robert S Chapkin Journal: Biochim Biophys Acta Date: 2015-10-19