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2015 ; 10
(10
): e0138833
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English Wikipedia
Arterial Expression of the Calcium-Sensing Receptor Is Maintained by
Physiological Pulsation and Protects against Calcification
#MMPMID26436544
Molostvov G
; Hiemstra TF
; Fletcher S
; Bland R
; Zehnder D
PLoS One
2015[]; 10
(10
): e0138833
PMID26436544
show ga
Vascular calcification (VC) is common in chronic kidney disease (CKD) and
contributes to cardiovascular mortality. The calcium-sensing receptor (CaSR) is
present in human artery, senses extracellular calcium and may directly modulate
VC. OBJECTIVE: to investigate the association between arterial cyclic strain,
CaSR expression and VC. METHODS AND RESULTS: human aortic smooth muscle cells
(HAoSMC) were cultured under static or strained conditions, with exposure to CaSR
agonists, the calcimimetic R568, and after CaSR silencing and over-expression.
High extracellular calcium reduced CaSR expression and promoted osteochondrogenic
transformation and calcium deposition. This was partially prevented by cyclic
strain and exposure to R568. CaSR silencing enhanced calcification and
osteochondrogenic transformation, whereas CaSR over-expression attenuated this
procalcific response, demonstrating a central role for the CaSR in the response
to cyclic strain and regulation of VC. In arterial explants from CKD patients (n
= 11) and controls (n = 9), exposure to R568 did not significantly alter calcium
deposition, osteochondrogenic markers or total artery calcium content.
CONCLUSIONS: physiological mechanical strain is important for arterial
homeostasis and may protect arteries from VC. The beneficial effects of cyclic
strain may be mediated via the CaSR.