ABSTRACT
Objective:To investigate the effect on the expression of Slug for the trasfection of miR-200c combined with the research on the ability of migration of breast cancer cell BT549.Methods:Chemically synthesized miR-200c mimic was trasfected into BT549 cells,which have high metastatic potential.The effect on the ability of migration of breast cancer cell BT549 for the transfection of miR-200c was analyzed by Transwell migration assay and Wound healing assay.The expression of Slug and E-cadherin mRNA was detected by Real-time PCR.The expression of Slug protein was detected by Western blot.Results:Transfection with miR-200c mimic significantly down-regulated the expression of Slug as compared with the control group (P<0.05).BT549 cell tranfected with miR-200c mimic had lower levels of migration capacity than cells in the control group (P<0.05).Conclusion:miR-200c inhibits Epithelial-mes-enchymal transition by suppressing Slug leading to down-regulation of migration capacity of breast cancer cell BT549.
ABSTRACT
OBJECTIVE: To prepare a eukaryotic expression vector for cell penetrating peptide fusion protein PTEN-VP22, and to evaluate whether the cell penetrating peptide VP22 increase the expression and distribution of the tumor suppressor protein PTEN in BT549. METHODS: The eukaryotic expression vectors pcDNA3-PTEN and pcDNA3-PTEN-VP22 were constructed and then transferred to BT549. The expression and distribution of PTEN protein and PTEN-VP22 fusion protein were identified by Western blot and immunofluorescence. RESULTS: PTEN protein and PTEN-VP22 fusion protein were successfully expressed in BT549. The expression and distribution of PTEN-VP22 were significantly increased compared with those of PTEN. The distribution of PTEN-VP22 was in a typical VP22 pattern and mainly distributed in nucleus. CONCLUSION: The cell penetrating peptide VP22 enhances the expression and distribution of the tumor suppressor protein PTEN in BT549.