Objective Our study aims to investigate the inhibitive effects of miR -124 on the growth of breast cancer cell MCF -7 induced by paclitaxel .Methods MTT was used to detect the growth inhibition of MCF-7 induced by paclitaxel .Flow cytometry was used to detect the effect of paclitaxel on cell cycle .Real-time quantitative PCR(qRT-PCR) was used to detect the expressive level of miR -124,while MCF -7 cells were treated with paclitaxel .MiR-124 inhibitor was transfected into MCF -7 breast cancer cells ,and growth in-hibition was detected by MTT .Results The results showed that paclitaxel could significantly inhibit the growth of breast cancer cell line MCF -7 by blocking the G2 phase.The results from qRT-PCR showed that the relative expression of miR-124 was increased when the dosage of paclitaxel was increased .When the expression of miR-124 was inhibited ,the cell growth inhibition caused by paclitaxel was also prominently decreased .Conclusion The higher expression of miR -124 in MCF-7 induced by paclitaxel was dose dependent .And miR-124 in-hibitor can significantly influence the cell growth inhibition caused by paclitaxel .These results indicat that miR -124 plays an important role in paclitaxel -induced chemotherapy drug resistance ,and provides a new direction to solve the problem .

MicroRNAs are non-coding small RNAs that participate in the regulation of post transcriptional gene expression.MicroRNAs play the roles of inhibiting cancer or promoting cancer in different tumors.MicroRNA-373 is one of the members of the microRNA-520/373 family,which is involved in cancer anoxic response and DNA damage repair.MicroRNA-373 is abnormal expressed in breast cancer,glioma,lung cancer,prostate cancer and other tumors,which may play an important role in tumor development process,especially in tumor invasion and migration.

Sulforaphane (SFN) is an isothiocyanate rich in cruciferous vegetables, and is one of the plant active substances with strong anticancer activity. SFN can protect cells from environmental carcinogens and induce growth arrest and apoptosis of various cancer cells. This article reviews the research progress of SFN in tumor prevention, treatment, and its role in tumor stem cells, explores the feasibility of SFN in clinical application for cancer prevention, and provides new strategies to reduce the development and recurrence of malignant tumors and improve patient survival.