MicroRNA-148b promotes proliferation of hair follicle cells by targeting NFAT5

Abstract

MicroRNAs (miRNAs), small non-coding RNAs, are involved in many aspects of biological processes. Previous studies have indicated that miRNAs are important for hair follicle development and growth. In our study, we found by qRT-PCR that miR-148b was significantly upregulated in sheep wool follicle bulbs in anagen phase compared with the telogen phase of the hair follicle cycle. Overexpression of miR-148b promoted proliferation of both HHDPC and HHGMC. By using the TOPFlash system we demonstrated that miR-148b could activate Wnt/β-catenin pathway and b-catenin, cycD, c-jun and PPARD were consistently upregulated accordingly. Furthermore, transcript factor nuclear factor of activated T cells type 5 (NFAT5) and Wnt10b were predicted to be the target of miR-148b and this was substantiated using a Dual-Luciferase reporter system. Subsequently NFAT5 was further identified as the target of miR-148b using western blotting. These results were considered to indicate that miR-148b could activate the Wnt/β-catenin signal pathway by targeting NFAT5 to promote the proliferation of human hair follicle cells.

Keywords

miR-148b / hair follicle / proliferation / NFAT5 / Wnt10b

References

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Acknowledgements

This work was supported by grants from the National High Technology Research and Development Program of China (2013AA102506), and Regional Project of National Natural Science Foundation of China (31360534). We would like to thank Dr. Xiaohui Tang for the help in sample collection.

Wanbao Yang, Qinqun Li, Bo Su, and Mei Yu declare that they have no conflict of interest or financial conflicts to disclose.

All applicable institutional and national guidelines for the care and use of animals were followed.

RIGHTS & PERMISSIONS

Higher Education Press and Springer-Verlag Berlin Heidelberg