| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 6261987 | Brain Research Bulletin | 2011 | 5 Pages |
This study aimed to investigate the role and mechanism of action of microRNA (miR) let-7e in PC12 cells undergoing apoptosis following anoxia/reoxygenation (A/R) injury. The putative binding site of let-7e in the 3â² UTR of caspase-3 (Casp3) mRNA was analyzed using the miRanda algorithm. Precursor let-7e (pre-miRNA), let-7e miR and anti-let-7e oligonucleotides were transfected into PC12 cells, which were then subjected to A/R injury. The levels of Casp3 mRNA and let-7e miRNA, the total protein levels of Casp3, Casp8 and Casp9 and levels of cellular apoptosis were measured. It was found that let-7e expression in PC12 cells was decreased, whereas the expression of Casp3 was significantly increased after A/R injury. The transfection of pre-miRNA or let-7e miR into PC12 cells decreased Casp3 expression levels and cellular apoptosis following A/R injury, while co-transfection of anti-let-7e strikingly alleviated the effects of let-7e miR. These results indicate that let-7e may protect PC12 cells against apoptosis following A/R injury by negatively regulating the expression of Casp3.
⺠let-7e can bind to 3ⲠUTR of caspase-3 mRNA. ⺠let-7e was decreased whereas caspase3 increased in PC12 following A/R injury. ⺠pre-let7e transfection decreased the caspase3 expression in PC12 following A/R injury. ⺠pre-let7e transfection decreased cellular apoptosis in PC12 following A/R injury. ⺠Co-transfection of anti-let-7e alleviated the effects of pre-let-7e.
