反义miR-30a-5p抑制脑胶质瘤生长的体内实验研究

Inhibitory effect of antisense miR-30a-5p on glioma cell growth in vivo

ObjectiveTo study the inhibitory effect of knocking down miR-30a-5p on the U87 human glioma xenograft growth and its possible mechanism. MethodsNude mice bearing subcutaneous U87 human glioblastoma were established and treated with miR-30a-5p antisense oligonucleotides (AS-miR-30a-5p) subcutaneous injection. Tumor size was measured every other day until the observation period ended. Researchers executed the animals after the treatment, stripped tumor tissues and extracted RNA and protein. Real-time PCR were conducted to detect the expression of miR-30a-5p. The histopathological characteristics and proliferation and apoptosis biological characters (including SEPT7, PCNA, cyclinD1, MMP-2, apoptosis related factor P53, bcl-2 and caspase3)were evaluated by HE and immunohistochemical staining, Western blot analysis respectively, and the cell apoptosis was detected by TUNEL method.ResultsIn AS-miR-30a-5p treated group, the tumor growth was delayed and the final tumor volume was smaller than that in the control and scr-ODN treated group (F=7.167, P＜0.05), and the expression of miR-30a-5p was knocked down. The expression of PCNA、cyclinD1 were significantly down-regulated while P53、SEPT7 and caspase3 up-regulated. Apoptotic index was increased significantly. ConclusionAs-miR-30a-5p suppresses the growth of U87 human gliomas xenografts significantly. Malignant phenotype of tumors are reversed to a considerable degree. Therefore, miR-30a-5p can be a candidate for targeted therapy of human glioma.