title: Acquisition of the contractile phenotype by murine arterial smooth muscle cells depends on the Mir143/145 gene cluster.
abstract: VSMCs respond to changes in the local environment by adjusting their phenotype from contractile to synthetic, a phenomenon known as phenotypic modulation or switching. Failure of VSMCs to acquire and maintain the contractile phenotype plays a key role in a number of major human diseases, including arteriosclerosis. Although several regulatory circuits that control differentiation of SMCs have been identified, the decisive mechanisms that govern phenotypic modulation remain unknown. Here, we demonstrate that the mouse miR-143/145 cluster, expression of which is confined to SMCs during development, is required for VSMC acquisition of the contractile phenotype. VSMCs from miR-143/145-deficient mice were locked in the synthetic state, which incapacitated their contractile abilities and favored neointimal lesion development. Unbiased high-throughput, quantitative, mass spectrometry-based proteomics using reference mice labeled with stable isotopes allowed identification of miR-143/145 targets; these included angiotensin-converting enzyme (ACE), which might affect both the synthetic phenotype and contractile functions of VSMCs. Pharmacological inhibition of either ACE or the AT1 receptor partially reversed vascular dysfunction and normalized gene expression in miR-143/145-deficient mice. We conclude that manipulation of miR-143/145 expression may offer a new approach for influencing vascular repair and attenuating arteriosclerotic pathogenesis.
authors.affiliation: Max-Planck-Institut für Herz- und Lungenforschung, Bad Nauheim, Germany. thomas.boettger@mpi-bn.mpg.de
authors.forename: Thomas
authors.initials: T
authors.lastname: Boettger
authors.forename: Nadine
authors.initials: N
authors.lastname: Beetz
authors.forename: Sawa
authors.initials: S
authors.lastname: Kostin
authors.forename: Johanna
authors.initials: J
authors.lastname: Schneider
authors.forename: Marcus
authors.initials: M
authors.lastname: Krüger
authors.forename: Lutz
authors.initials: L
authors.lastname: Hein
authors.forename: Thomas
authors.initials: T
authors.lastname: Braun
mesh_terms: D047228:Angiotensin II Type 1 Receptor Blockers / Q000494:pharmacology; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000494:pharmacology; D000818:Animals; D001158:Arteries / Q000166:cytology / Q000502:physiology; D001483:Base Sequence; D002216:Captopril / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D019808:Losartan / Q000494:pharmacology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D035683:MicroRNAs / Q000235:genetics*; D005810:Multigene Family; D009119:Muscle Contraction / Q000235:genetics* / Q000502:physiology*; D032389:Myocytes, Smooth Muscle / Q000187:drug effects / Q000502:physiology*; D020411:Oligonucleotide Array Sequence Analysis; D010641:Phenotype; D017539:Tunica Intima / Q000166:cytology
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D000806:Angiotensin-Converting Enzyme Inhibitors; C543499:MIRN145a microRNA, mouse; D035683:MicroRNAs; C532884:MIRN143 microRNA, mouse; D002216:Captopril; D019808:Losartan
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