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DOI: 10.1055/s-0042-1755329
Protein Tyrosine Phosphatase 1B Deficiency in Vascular Smooth Muscle Cells Promotes Perivascular Fibrosis following Arterial Injury
Funding This study was supported by grants from the Deutsche Forschungsgemeinschaft (SCHA 808/15-1 to K.S.) and the German Center for Cardiovascular Research (DZHK e.V.; Doktoranden-Stipendium to D.V.). Results shown in this study are part of the medical thesis of D.V.
Abstract
Background Smooth muscle cell (SMC) phenotype switching plays a central role during vascular remodeling. Growth factor receptors are negatively regulated by protein tyrosine phosphatases (PTPs), including its prototype PTP1B. Here, we examine how reduction of PTP1B in SMCs affects the vascular remodeling response to injury.
Methods Mice with inducible PTP1B deletion in SMCs (SMC.PTP1B-KO) were generated by crossing mice expressing Cre.ERT2 recombinase under the Myh11 promoter with PTP1Bflox/flox mice and subjected to FeCl3 carotid artery injury.
Results Genetic deletion of PTP1B in SMCs resulted in adventitia enlargement, perivascular SMA+ and PDGFRβ+ myofibroblast expansion, and collagen accumulation following vascular injury. Lineage tracing confirmed the appearance of Myh11-Cre reporter cells in the remodeling adventitia, and SCA1+ CD45- vascular progenitor cells increased. Elevated mRNA expression of transforming growth factor β (TGFβ) signaling components or enzymes involved in extracellular matrix remodeling and TGFβ liberation was seen in injured SMC.PTP1B-KO mouse carotid arteries, and mRNA transcript levels of contractile SMC marker genes were reduced already at baseline. Mechanistically, Cre recombinase (mice) or siRNA (cells)-mediated downregulation of PTP1B or inhibition of ERK1/2 signaling in SMCs resulted in nuclear accumulation of KLF4, a central transcriptional repressor of SMC differentiation, whereas phosphorylation and nuclear translocation of SMAD2 and SMAD3 were reduced. SMAD2 siRNA transfection increased protein levels of PDGFRβ and MYH10 while reducing ERK1/2 phosphorylation, thus phenocopying genetic PTP1B deletion.
Conclusion Chronic reduction of PTP1B in SMCs promotes dedifferentiation, perivascular fibrosis, and adverse remodeling following vascular injury by mechanisms involving an ERK1/2 phosphorylation-driven shift from SMAD2 to KLF4-regulated gene transcription.
* These authors share the first authorship.
Publikationsverlauf
Eingereicht: 15. März 2022
Angenommen: 25. Juni 2022
Artikel online veröffentlicht:
08. September 2022
© 2022. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commercial purposes, or adapted, remixed, transformed or built upon. (https://creativecommons.org/licenses/by-nc-nd/4.0/)
Georg Thieme Verlag KG
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