In:
European Journal of Clinical Investigation, Wiley, Vol. 45, No. 11 ( 2015-11), p. 1129-1144
Abstract:
Vascular calcification ( VC ) is highly prevalent in patients with chronic kidney disease ( CKD ). Low magnesium levels are associated with VC , and recent in vitro studies confirm a protective role of magnesium, which is mediated by its entry into the VSMC s through the Transient Receptor Potential Melastatin 7 ( TRPM 7) channel. The role of Angiotensin II (Ang II ) on VC is still unclear. As Ang II is able to stimulate TRPM 7 activity, we hypothesize that it might prevent VC . Thus, the aim of this study was to dissect the direct effect of Ang II on VC . Materials and methods We worked with a model of high phosphate ( HP )‐induced calcification in human aortic smooth muscle cells, which resembles the CKD ‐related VC . Results Addition of Ang II to cells growing in HP decreased calcification, which was associated with the upregulation of the osteogenic factors BMP 2, Runx2/Cbfa1, Osterix and ALP . A reduction of magnesium entry into the HP ‐calcifying cells was found. The treatment with Ang II avoided this reduction, which was reversed by the cotreatment with the TRPM 7‐inhibitor 2‐ APB . The protective effect of Ang II was related to AT 1R‐induced ERK 1/2 MAPK inase activation. HP ‐induced calcification was also associated with the upregulation of the canonical Wnt/beta‐catenin pathway, while its downregulation was related to attenuation of calcification by Ang II . Conclusion As hypothesized, Ang II prevented phosphate‐induced calcification in VSMC s, which appears mediated by the increase of magnesium influx and by the activation of the ERK 1/2 and the inhibition of the canonical Wnt/beta‐catenin signalling pathways.
Type of Medium:
Online Resource
ISSN:
0014-2972
,
1365-2362
DOI:
10.1111/eci.2015.45.issue-11
Language:
English
Publisher:
Wiley
Publication Date:
2015
detail.hit.zdb_id:
2004971-7
Permalink