That β-catenin failed to combine with TCF4 and the following inhibitory expression of their downstream factors might play a key role in the decrease of invasion and proliferation ability of SGC-7901 cell in vivo and in vitro as showed above. Conclusion: This study demonstrates that FH535 can inhibit proliferation and invasion

MK-8669 of human gastric adenocarcinoma cell line SGC-7901 in vivo and in vitro. Further, these phenomena may relate to the lower expression of c-Myc and cyclin-D1. Key Word(s): 1. FH535; 2. gastric neopasia; 3. cell prolifration; 4. cell invation; Presenting Author: YING SHAO Additional Authors: SHENG-TAO ZHU, PENG LI, YONG-JUN WANG, YONG-DONG WU, BANG-WEI CAO, SHU-TIAN ZHANG Corresponding Author: YING SHAO Affiliations: Friendship Hospital, Capital Medical University; Friendship Hospital, Capital medical

University; Friendship Hospital, Captital Medical University Objective: Overexpression of cyclooxygenase-2 (COX-2) is associated with the carcinogenesis of esophageal squamous cell carcinoma (ESCC). Bioinformatic analysis showed that miR-26a and miR-144 could bind to 3′ UTR of COX-2. In this study, we planned to investigate the functions and mechanisms of two miRNAs in ESCC. Methods: Eleven ESCC cell lines, one immotalized esophageal cell (Het-1A), 30 pairs ESCC and corresponding non-tumour tissues, and BALB/c nude mice were selected to study. Real-time PCR was used for detecting miRNAs in tissue samples and cell lines, western blot for COX-2 protein in cell lines. CCK8, transwell chamber assay and flow cytometry were used to Torin 1 detect the functional change of ESCC cell lines after being overexpressed these miRNAs by constructing stable over-expression clones. Dual luciference reporter gene assay were used to verify that miR-26a and miR-144 could target COX-2 in ESCC. ESCC cell lines that were stably transfected with miR-26a, miR-144 and miR-26a-144 were injected into subcutaneous or tail veil of nude mice. Etofibrate The

volume of tumour or numbers of tumour nodules formed on the liver surfaces were calculated. Results: The expression level of two miRNAs were down-regμlated in both ESCC cell lines and ESCC tissues. MiR-26a and miR-144 could inhibit the metastasis of ESCC both in vivo and in vitro. Cluster vector of miR-26a and miR-144 could enhance the inhibitive metastasis effect of miR-26a or miR-144 and had inhibitive proliferation effect on ESCC, while miR-144 or 26a did not have inhibitive effect on proliferation in ESCC. The inhibitive effect of miR-26a and miR-144 on ESCC was partly through COX-2 pathway. Conclusion: MiR-26a and miR-144 could inhibit the development and progression of ESCC through inhibiting COX-2 pathway. MiR-26a and miR-144 had better inhibitive effect on the development and progression of ESCC by constructing cluster vector of miR-144 and miR-26a. Key Word(s): 1. ESCC; 2. Cyclooxygenase-2; 3. miR-26a; 4.