Abstract
MicroRNAs (miRNAs) coordinate vascular repair by regulating injury-induced gene expression in vascular smooth muscle cells (SMCs) and promote the transition of SMCs from a contractile to a proliferating phenotype. However, the effect of miRNA expression in SMCs on neointima formation is unclear. Therefore, we studied the role of miRNA biogenesis by Dicer in SMCs in vascular repair. Following wire-induced injury to carotid arteries of Apolipoprotein E knockout (Apoe −/−) mice, miRNA microarray analysis revealed that the most significantly regulated miRNAs, such as miR-222 and miR-21-3p, were upregulated. Conditional deletion of Dicer in SMCs increased neointima formation by reducing SMC proliferation in Apoe −/− mice, and decreased mainly the expression of miRNAs, such as miR-147 and miR-100, which were not upregulated following vascular injury. SMC-specific deletion of Dicer promoted growth factor and inflammatory signaling and regulated a miRNA–target interaction network in injured arteries that was enriched in anti-proliferative miRNAs. The most connected miRNA in this network was miR-27a-3p [e.g., with Rho guanine nucleotide exchange factor 26 (ARHGEF26)], which was expressed in medial and neointimal SMCs in a Dicer-dependent manner. In vitro, miR-27a-3p suppresses ARHGEF26 expression and inhibits SMC proliferation by interacting with a conserved binding site in the 3′ untranslated region of ARHGEF26 mRNA. We propose that Dicer expression in SMCs plays an essential role in vascular repair by generating anti-proliferative miRNAs, such as miR-27a-3p, to prevent vessel stenosis due to exaggerated neointima formation.
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Abbreviations
- Apoe :
-
Apolipoprotein E
- ARHGEF26 :
-
Rho guanine nucleotide exchange factor 26
- CHST1 :
-
Carbohydrate (keratan sulfate Gal-6) sulfotransferase 1
- DAPI:
-
4’,6-Diamidino-2-phenylindole
- DLL4 :
-
Delta-like 4
- DMEM:
-
Dulbecco′s modified eagle medium
- EC:
-
Endothelial cell
- EGF:
-
Epidermal growth factor
- HASMC:
-
Human aortic smooth muscle cell
- HEK293:
-
Human embryonic kidney 293 cell
- HFD:
-
High-fat diet
- IGFBP3 :
-
Insulin-like growth-factor-binding protein 3
- IL-1β:
-
Interleukin-1β
- KO:
-
Knockout
- LNA:
-
Locked nucleic acid
- microRNA:
-
miRNA, miR
- MYH11 :
-
Myosin, heavy chain 11, smooth muscle
- NF-κB:
-
Nuclear factor of kappa light polypeptide gene enhancer in B-cells
- OIT3 :
-
Oncoprotein-induced transcript 3
- PDGF:
-
Platelet-derived growth factor
- miRISC:
-
miRNA-induced-silencing complex
- SH3BGRL2 :
-
SH3-domain-binding glutamate-rich protein-like 2
- SMA:
-
Smooth muscle actin
- SMC:
-
Smooth muscle cell
- TAGLN :
-
Transgelin
- TNFα:
-
Tumor necrosis factor α
- TNRC6A:
-
Argonaute and trinucleotide repeat containing 6A
- TSB:
-
Target site blocker
- UTR:
-
Untranslated region
- WT:
-
Wild type
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Acknowledgments
This work has been funded by the German Research Foundation (DFG) as part of the Collaborative Research Center 1123 (B04) and by the German Center for Cardiovascular Research (MHA VD1.2). The authors declare no competing financial interests.
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F. Zahedi and M. Nazari-Jahantigh are co-first authors.
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Zahedi, F., Nazari-Jahantigh, M., Zhou, Z. et al. Dicer generates a regulatory microRNA network in smooth muscle cells that limits neointima formation during vascular repair. Cell. Mol. Life Sci. 74, 359–372 (2017). https://doi.org/10.1007/s00018-016-2349-0
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DOI: https://doi.org/10.1007/s00018-016-2349-0