The study of screening breast tumor suppressor microRNA in mice / 中国比较医学杂志

Objective To investigate the functional role of 25 microRNAs in breast cancer ,and to find new tumor suppressor microRNAs that may serve as specific targets of new gene therapies . Methods Twenty-five microRNAs expression vectors were constructed and stably transfected into mouse mammary tumor cells 4To7 by Lipofectamine2000. Cells were selected with G418 and sorted by Flow cytometry.The cells in logarithmic phase were collected and 2 ×105 cells/mouse was inoculated into BALB/c mice via tail vein .Lungs were harvested 14 days after tumor cell inoculation , and the number of metastasis foci was counted .Results Mice inoculated with mir-449a-expressing 4To7 cells via tail vein developed reduced lung metastases compared with mice inoculated with negative control cells .Mice inoculated with mir-1935-expressing 4To7 cells via tail vein developed increased lung metastases compared with mice inoculated with negative control cells .Other twenty-three microRNAs neither promoted nor inhibited lung metastases of breast cancer .Conclusions Two of twenty-five microRNA were identified to be associated with breast cancer metastasis .MiR-449a may play a tumour suppressor role in the regulation of migration and metastasis in breast cancer .miR-1935 transgenic over-expression promoted tumor growth and metastasis .

The effects of Metacycloprodigiosin on tumor metastasis-associated cell behavior in vitro / 中国药理学通报

Aim To investigate the effects of Metacycloprodigiosin(MP) on tumor metastasis-associated cell behavior in vitro.Methods The effects of MP on the proliferation of HUVEC and 4TO7 cells were observed by MTT assay.Migration abilities of HUVEC and 4TO7 cells were measured by wound healing assay.Tube formation of HUVEC in the presence of MP for 10 hours was evaluated on matrigel basement membrane matrix.The abilities of adhesion and invasion of 4TO7 with MP for 24 hours were measured quantitatively by cell adhesion and transwell assay.Results MP did not affect proliferation of HUVEC and 4TO7 cells in concentration less than 10 μmol·L-1.MP inhibited HUVEC cells migration and formation of the tube in the concentrations of 0.01 to 1 μmol·L-1.In these concentrations MP could also inhibit 4TO7 cells migration,adhesion and invasion.Conclusion sThese results demonstrate that MP effectively inhibits tumor metastasis in vitro.All these findings suggest its potential as an anti-tumor metastasis compound in vivo.