Osthole suppresses the proliferation and accelerates the apoptosis of human glioma cells via the upregulation of microRNA-16 and downregulation of MMP-9

摘要

Osthole (7-methoxy-8-isoamyl alkenyl coumarin) has been reported to exhibit marked anticancer effects on several types of cancer. The expression levels of matrix metalloproteinase-9 (MMP-9) are closely associated with the pathogenesis of glioma. Furthermore, it is reported that the upregulation of microRNA-16 (miR-16) by the MMP-9 signaling pathway can restrain the proliferation of cancer cells. To examine whether osthole increases the anticancer effect on human glioma cells in the present study, the common glioma cell line, U87, was treated with osthole at concentrations of 0, 50, 100 and 200 mu M. The effects of osthole on cell viability were determined using a 3-(4,5-dimethylthiazol-2-thiazolyl)-2,5-diphenyl-tetrazolium bromide assay. The rate of cellular apoptosis was analyzed by measuring the activity of caspase-3 and using flow cytometry. The expression of MMP-9 was determined using gelatin zymography assays and the expression of miR-16 was determined using reverse transcription-quantitative polymerase chain reaction. The results demonstrated that osthole significantly suppressed the proliferation and accelerated the apoptosis of the U87 cells. Furthermore, increased expression levels of miR-16 and reduced protein expression levels of MMP-9 were found in the U87 cells. In addition, miR-16 was found to regulate the expression of MMP-9 in the U87 cells through transfection of miR-16 precursor and anti-miR-16 into the U87 cells. In conclusion, these observations indicated that osthole suppressed the proliferation and accelerated the apoptosis of human glioma cells through upregulation of the expression of miR-16 and downregulation of the expression of MMP-9.