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Hsa-miR-27a is involved in the regulation of CYP3A4 expression in human livers from Chinese Han population.

AIM
The huge interindividual difference of CYP3A4 expression may contribute to the variability of drug response. Post-transcriptional regulation of CYP3A4 remains elusive although transcriptional regulation has been studied much more clearly. microRNAs (miRNAs) were reported to be one of factors to regulate the expression of CYP3A4 previously.


MATERIALS & METHODS
Based on the in silico prediction of 3'-UTR-bindind site of microRNA-27a (miR-27a), the transcriptional and post-transcriptional regulation of miR-27a were investigated through luciferase reporter assay, real-time PCR and immunoblot.


RESULTS
The significantly decrease of CYP3A4 3'-UTR-luciferase activity in human embryonic kidney 293 and Hep3B cells was detected after transfected with plasmid that expressed miRNA-27a in luciferase reporter assay. Correlation study was conducted in human livers (n = 26) and significant correlation has been discovered between miRNA-27a and CYP3A4 mRNA and protein level.


CONCLUSION
Together, these findings suggest that miR-27a might be involved in the regulation of CYP3A4 gene expression.