| Recent evidence presented the important role of microRNAs in health and disease
particularly in human cancers. Among those, miR-193 family contributes as a tumor suppressor
in different benign and malignant cancers like breast cancer via interaction with specific
targets. On the other hand, it was stated that miR-193 is able to modulate some targets in
chemoresistant cancer cells. Therefore, the aim of this study was to evaluate the potential
function of miR-193a-5p and paclitaxel in the apoptosis induction by targeting P53 in breast
cancer cells.
Methods: At first, miR-193a-5p mimics were transfected to MDA-MB-231 breast cancer cell
line which indicated the lower expression level of miR-193a-5p. Subsequently, the transfected
cells were treated with paclitaxel. Then, cell viability, apoptosis, and migration were evaluated
by MTT, flow cytometry and DAPI staining, and scratch-wound motility assays, respectively.
Moreover, the expression levels of P53 was evaluated by qRT-PCR.
Results: The expression level of miR-193a-5p was restored in MDA-MB-231 cells which
profoundly inhibited the proliferation (P < 0.0001), induced apoptosis (P < 0.0001) and
harnessed migration (P < 0.0001) in the breast cancer cells and more effectiveness was
observed in combination with paclitaxel. Interestingly, increased miR-193a-5p expression led
to a reduction in P53 mRNA, offering that it can be a potential target of miR-193a.
Conclusion: Taken together, it is concluded that the combination of miR-193a-5p restoration and paclitaxel could be potentially considered as an effective therapeutic strategy to get over chemoresistance during paclitaxel chemotherapy. |