Abstract
MicroRNAs (miRNAs) have been known to affect various biological processes by repressing expression of specific genes. Here we describe an essential function of the miR-34/449 family during differentiation of epithelial cells. We found that miR-34/449 suppresses the cell-cycle machinery in vivo and promotes cell-cycle exit, thereby allowing epithelial cell differentiation. Constitutive ablation of all six members of this miRNA family causes derepression of multiple cell cycle-promoting proteins, thereby preventing epithelial cells from exiting the cell cycle and entering a quiescent state. As a result, formation of motile multicilia is strongly inhibited in several tissues such as the respiratory epithelium and the fallopian tube. Consequently, mice lacking miR-34/449 display infertility as well as severe chronic airway disease leading to postnatal death. These results demonstrate that miRNA-mediated repression of the cell cycle is required to allow epithelial cell differentiation.
Original language | English (US) |
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Pages (from-to) | 10660-10665 |
Number of pages | 6 |
Journal | Proceedings of the National Academy of Sciences of the United States of America |
Volume | 114 |
Issue number | 40 |
DOIs | |
State | Published - Oct 3 2017 |
Funding
ACKNOWLEDGMENTS. We thank Drs. Sanny S. Chung and Debra J. Wolge-muth for advice, and Carolina Vazquez, Justyna Rozycka, Anran Li, Xiaoting Li, and Jeffrey T. Czaplinski for help. This work was supported by National Cancer Institute, National Institutes of Health, Department of Health and Human Services Grants R01 CA083688 and CA132740 (to P.S.).
Keywords
- Cell cycle
- Ciliogenesis
- Cyclins
- Epithelial differentiation
- miR-34
ASJC Scopus subject areas
- General