Conclusion
Our results indicated that FGF23 was target of miR-297a and decreased miR-297a in vascular calcification lead to the increase of FGF23, which together with Klotho might enhance vascular calcification. The findings of this study could provide valuable information for the understanding of mechanisms underlying miR-dependent vascular calcification as well as potential treatment target for the disease.
Methods
In the current study, we built a vascular calcification rat model using vitamin D3 plus nicotine and analyzed miRNA expression profile by miRNA chip assay. Potential target of one selected miRNA with sharpest variation in expression were predicted by both PicTar and TargetScan. The impact of the selected miRNA on the expression of the potential target on both mRNA and protein levels were measured by RT-PCR and Western blot, respectively.
Results
Our results identified 16 dysregulated miRNAs, among which miR-297a showed the sharpest variation. Further analysis focusing on miR-297a revealed that fibroblast growth factor 23 (FGF23) was a potential target of miR297a. Measurement of FGF23 and its regulator Klotho on both mRNA and protein levels demonstrated that FGF23 was significantly increased while Klotho was decreased in rats with vascular calcification.