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          Institute: MPI für Herz- und Lungenforschung (W. G. Kerckhoff Institut)     Collection: Yearbook 2016     Display Documents

ID: 724011.0, MPI für Herz- und Lungenforschung (W. G. Kerckhoff Institut) / Yearbook 2016
Spontaneous activity and stretch-induced contractile differentiation are reduced in vascular smooth muscle of miR-143/145 knockout mice
Authors:Bhattachariya, A.; Dahan, D.; Ekman, M.; Boettger, T.; Braun, T.; Sward, K.; Hellstrand, P.; Albinsson, S.
Date of Publication (YYYY-MM-DD):2015-11
Title of Journal:Acta Physiol (Oxf)
Issue / Number:3
Start Page:133
End Page:143
Audience:Not Specified
Abstract / Description:AIM: Stretch is essential for maintaining the contractile phenotype of vascular smooth muscle cells, and small non-coding microRNAs are known to be important in this process. Using a Dicer knockout model, we have previously reported that microRNAs are essential for stretch-induced differentiation and regulation of L-type calcium channel expression. The aim of this study was to investigate the importance of the smooth muscle-enriched miR-143/145 microRNA cluster for stretch-induced differentiation of the portal vein. METHODS: Contractile force and depolarization-induced calcium influx were determined in portal veins from wild-type and miR-143/145 knockout mice. Stretch-induced contractile differentiation was investigated by determination of mRNA expression following organ culture for 24 h under longitudinal load by a hanging weight. RESULTS: In the absence of miR-143/145, stretch-induced mRNA expression of contractile markers in the portal vein was reduced. This was associated with decreased amplitude of spontaneous activity and depolarization-induced contractile and intracellular calcium responses, while contractile responses to 5-HT were largely maintained. We found that these effects correlated with a reduced basal expression of the pore-forming subunit of L-type calcium channels and an increased expression of CaMKIIdelta and the transcriptional repressor DREAM. CONCLUSION: Our results suggest that the microRNA-143/145 cluster plays a role in maintaining stretch-induced contractile differentiation and calcium signalling in the portal vein. This may have important implications for the use of these microRNAs as therapeutic targets in vascular disease.
Free Keywords:L-type calcium channel; contractility; mechanotransduction; miR-145; microRNA; portal vein
External Publication Status:published
Document Type:Article
Communicated by:n.n.
Affiliations:MPI für physiologische und klinische Forschung
External Affiliations:Max Planck Institute for Heart and Lung Research, Bad Nauheim, Germany.
Identifiers:ISSN:1748-1716 (Electronic) 1748-1708 (Linking) %R 10.1111/apha.12536
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