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International Journal of Molecular Sciences
Article . 2021 . Peer-reviewed
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PubMed Central
Other literature type . 2021
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Biblos-e Archivo
Article . 2021
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Depósito Digital e-UCJC
Article . 2025
License: CC BY NC ND
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CCN2 Increases TGF-β Receptor Type II Expression in Vascular Smooth Muscle Cells: Essential Role of CCN2 in the TGF-β Pathway Regulation

Authors: Antonio Tejera-Muñoz; Laura Marquez-Exposito; Lucía Tejedor-Santamaría; Sandra Rayego-Mateos; Macarena Orejudo; Beatriz Suarez-Álvarez; Carlos López-Larrea; +2 Authors

CCN2 Increases TGF-β Receptor Type II Expression in Vascular Smooth Muscle Cells: Essential Role of CCN2 in the TGF-β Pathway Regulation

Abstract

The cellular communication network factor 2 (CCN2/CTGF) has been traditionally described as a mediator of the fibrotic responses induced by other factors including the transforming growth factor β (TGF-β). However, several studies have defined a direct role of CCN2 acting as a growth factor inducing oxidative and proinflammatory responses. The presence of CCN2 and TGF-β together in the cellular context has been described as a requisite to induce a persistent fibrotic response, but the precise mechanisms implicated in this relation are not described yet. Considering the main role of TGF-β receptors (TβR) in the TGF-β pathway activation, our aim was to investigate the effects of CCN2 in the regulation of TβRI and TβRII levels in vascular smooth muscle cells (VSMCs). While no differences were observed in TβRI levels, an increase in TβRII expression at both gene and protein level were found 48 h after stimulation with the C-terminal fragment of CCN2 (CCN2(IV)). Cell pretreatment with a TβRI inhibitor did not modify TβRII increment induced by CCN2(VI), demonstrating a TGF-β-independent response. Secondly, CCN2(IV) rapidly activated the SMAD pathway in VSMCs, this being crucial in the upregulation of TβRII since the preincubation with an SMAD3 inhibitor prevented it. Similarly, pretreatment with the epidermal growth factor receptor (EGFR) inhibitor erlotinib abolished TβRII upregulation, indicating the participation of this receptor in the observed responses. Our findings suggest a direct role of CCN2 maintaining the TGF-β pathway activation by increasing TβRII expression in an EGFR-SMAD dependent manner activation.

Keywords

TGF-β, Male, Medicina, Biología Celular y Molecular, EGFR, Myocytes, Smooth Muscle, Smad Proteins, TGF- receptors, Models, Biological, Article, Muscle, Smooth, Vascular, Mice, Transforming Growth Factor beta, Animals, RNA, Messenger, TGF-β receptors, Phosphorylation, Aorta, CCN2; TGF-β; SMAD; TGF-β receptors; EGFR; CTGF, Connective Tissue Growth Factor, Receptor, Transforming Growth Factor-beta Type II, CTGF, TGF, ErbB Receptors, Mice, Inbred C57BL, 3209 Farmacología, CCN2, SMAD, Signal Transduction

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
11
Top 10%
Average
Top 10%
Green
gold