当前位置： SCI文献检索 > ATHEROSCLEROSIS期刊下所有文献 > Potential pathological roles for oxidized low-density lipoprotein and scavenger receptors SR-AI, CD36, and LOX-1 in aortic valve stenosis.

Potential pathological roles for oxidized low-density lipoprotein and scavenger receptors SR-AI, CD36, and LOX-1 in aortic valve stenosis.

Abstract：

OBJECTIVE:To clarify the potential mechanisms by which oxidized low-density lipoprotein (oxLDL) could contribute to the progression of aortic valve stenosis (AVS). METHODS:We investigated a total of 46 stenotic and 20 control human aortic valves. The mRNA expression levels of scavenger receptor class A type 1 (SR-A1), CD36, Lectin-like oxidized LDL receptor-1 (LOX-1), and scavenger receptor class B type 1 (SR-B1) were studied using qPCR. Their cellular distribution in the valves was assessed by immunohistochemistry, and the potential effects of oxLDL were studied in cultured myofibroblasts isolated from the aortic valves. RESULTS:In AVS, the proinflammatory SR-A1 and the angiogenic LOX-1 were upregulated (p = 0.003 and p = 0.002), whereas the antiangiogenic CD36 was downregulated (p = 0.02). The expression of the atheroprotective SR-B1 remained unchanged. Immunohistochemistry revealed that SR-A1 was expressed by macrophages, whereas the expression of CD36 and LOX-1 was confined to myofibroblasts and endothelial cells in the diseased valves. In cultured valvular myofibroblasts, mast cell-derived components and TNF-α induced LOX-1 expression (p = 0.05 and p < 0.001), whereas oxLDL promoted the expression of proinflammatory cytokines. Furthermore, the expression of osteoprotegerin, an inhibitor of valvular calcification, decreased in response to oxLDL. Finally, myofibroblasts derived from stenotic valves accumulated more DiI-labeled oxLDL than myofibroblasts derived from macroscopically healthy valves (p = 0.035), so revealing enhanced foam cell-forming potential of myofibroblasts in the diseased valves. CONCLUSION:This study unveils the presence of SR-A1, CD36, and LOX-1 in aortic valves and suggests potential mechanisms by which they may contribute to the pathological angiogenesis, inflammation, calcification, and lipid accumulation in AVS.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Syväranta S,Alanne-Kinnunen M,Oörni K,Oksjoki R,Kupari M,Kovanen PT,Helske-Suihko S

doi

10.1016/j.atherosclerosis.2014.05.933

subject

Has Abstract

pub_date

2014-08-01 00:00:00

pages

398-407

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(14)01183-6

journal_volume

235

pub_type

杂志文章

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