Calcifying human aortic smooth muscle cells express different bone alkaline phosphatase isoforms, including the novel B1x isoform.
J Vasc Res
; 50(2): 167-74, 2013.
Article
in En
| MEDLINE
| ID: mdl-23328739
ABSTRACT
BACKGROUND:
Vascular calcification, causing cardiovascular morbidity and mortality, is associated with hyperphosphatemia in chronic kidney disease (CKD). In vitro, phosphate induces transdifferentiation of vascular smooth muscle cells to osteoblast-like cells that express alkaline phosphatase (ALP). In vivo, raised serum ALP activities are associated with increased mortality. A new bone ALP isoform (B1x) has been identified in serum from CKD patients. The present study investigated the different ALP isoforms in calcifying human aortic smooth muscle cells (HAoSMCs).METHODS:
HAoSMCs were cultured for 30 days in medium containing 5 or 10 mmol/l ß-glycerophosphate in the presence or absence of the ALP-specific inhibitor tetramisole.RESULTS:
All known bone-specific ALP (BALP) isoforms (B/I, B1x, B1 and B2) were identified in HAoSMCs. ß-Glycerophosphate stimulated calcification of HAoSMCs, which was associated with increased BALP isoforms B/I, B1x and B2. Tetramisole inhibited the ß-glycerophosphate-induced HAoSMC calcification, which was paralleled by the inhibition of the B1x and B/I, but not the other isoforms.CONCLUSIONS:
HAoSMCs express the four known BALP isoforms. B/I, B1x and B2 could be essential for soft tissue calcification. B/I and B1x were more affected by tetramisole than the other isoforms, which suggests different biological functions during calcification of HAoSMCs.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Aortic Diseases
/
Calcinosis
/
Myocytes, Smooth Muscle
/
Alkaline Phosphatase
/
Muscle, Smooth, Vascular
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
J Vasc Res
Journal subject:
ANGIOLOGIA
Year:
2013
Document type:
Article