Cited by 86Cardiac Valve Diseases and TreatmentsProteoglycans and glycosaminoglycans researchAtherosclerosis and Cardiovascular Diseases

Biglycan Induces the Expression of Osteogenic Factors in Human Aortic Valve Interstitial Cells via Toll-Like Receptor-2

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Song, Rui, Zeng, Qingchun, Ao, Lihua, Yu, Jessica A., Cleveland, Joseph C., Zhao, Ke-seng, Fullerton, David A., Meng, Xianzhong·2012·Arteriosclerosis, Thrombosis, and Vascular Biology

Abstract

Objective—: Although biglycan (BGN) and oxidized low-density lipoprotein (oxLDL) accumulation has been observed in calcific, stenotic aortic valves, their role in the pathogenesis of calcific aortic valve disease is poorly understood. We hypothesized that soluble BGN induces the osteogenic response in human aortic valve interstitial cells via Toll-like receptor (TLR) 2 and TLR4 and mediates the proosteogenic effect of oxLDL. Methods and Results—: Aortic valve interstitial cells of stenotic valves express higher levels of BGN. Stimulation of cells from normal valves with BGN increased the expression of bone morphogenetic protein-2 (BMP-2) and alkaline phosphatase (ALP) among the chondrogenic/osteogenic markers examined and caused accumulation of calcium deposits. TLR2 silencing, but not TLR4 silencing, reduced BMP-2 and ALP levels after BGN stimulation although coimmunoprecipitation revealed that BGN interacts with both TLR2 and TLR4. BGN induced the phosphorylation of extracellular signal-regulated protein kinase -1/2, p38 mitogen-activated protein kinase and nuclear factor-κB. Inhibition of extracellular-regulated kinase -1/2 markedly reduced the upregulation of BMP-2 and ALP expression by BGN whereas inhibition of p38 mitogen-activated protein kinase or nuclear factor-κB had a moderate effect. Stimulation of aortic valve interstitial cells with oxLDL upregulated BGN expression and release. Knockdown and neutralization of BGN reduced the effect of oxLDL on BMP-2 and ALP expression. Conclusion—: Extracellular soluble BGN induces the expression of BMP-2 and ALP in human aortic valve interstitial cells primarily via TLR2 and contributes to the proosteogenic effect of oxLDL. These findings highlight the potential role of soluble BGN and oxLDL in the development of calcific aortic valve disease.

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Crossref · 10.1161/atvbaha.112.300116

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  • Proteoglycans biglycan and decorin are overexpressed in aortic valves during calcific aortic stenosis and might participate in lipid retention and modification.

    “Proteoglycans such as biglycan and decorin are overexpressed in aortic valves during calcific AS and might actively participate in lipid retention and modification (Figure 4)52–54.”

    From Calcific aortic stenosis (2016) · cites this paper as [53]

    The Discussion reports biglycan accumulation in calcific, stenotic valve areas, and the Conclusion states that interstitial cells from stenotic valves express more biglycan. The paper does not report decorin overexpression in aortic valves or show that either proteoglycan retains or modifies lipids; it instead finds that oxidized LDL promotes biglycan expression. (LLM, conf=0.89)

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Authors
Song, R., Zeng, Q., Ao, L., Yu, J. A., Cleveland, J. C., Zhao, K.-S., Fullerton, D. A., & Meng, X.
Affiliations
Nanfang Hospital (CN)
Venue
Arteriosclerosis, Thrombosis, and Vascular Biology
Published
2012-11
Volume
32
Issue
11
Pages
2711-2720
ISSN
  • 1079-5642 (ISSN-L)
  • 1524-4636
OpenAlex
W2145458555
Cited by
86
References
46
Citations by year
2026: 1 · 2025: 1 · 2024: 4 · 2023: 5 · 2022: 5 · 2021: 4 · 2020: 8 · 2019: 9 · 2018: 8 · 2017: 10 · 2016: 3 · 2015: 10 · 2014: 12 · 2013: 6
FWCI
5.76
Type
journal article
Language
en
Open access
Locations
  • Arteriosclerosis Thrombosis and Vascular Biology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Heart, Lung, and Blood Institute (R01HL106582, HL106582)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Cardiac Valve Diseases and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Proteoglycans and glycosaminoglycans research
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
Keywords
biglycan, calcific aortic valve disease, aortic valve interstitial cells, TLR2, TLR4, oxidized LDL, BMP-2, alkaline phosphatase, osteogenic differentiation, ERK1/ERK2, p38 MAPK, nuclear factor-kappaB, valve calcification
MeSH terms
Adult, Aged, Alkaline Phosphatase, Aortic Valve, Aortic Valve Stenosis, Calcinosis, Cells, Cultured, Female, Humans, Lipoproteins, LDL, Male, Middle Aged, Osteogenesis, Phosphorylation, Time Factors, Transfection, Signal Transduction, Biomarkers, Case-Control Studies, NF-kappa B, Mitogen-Activated Protein Kinase 1, RNA Interference, p38 Mitogen-Activated Protein Kinases, Mitogen-Activated Protein Kinase 3, Toll-Like Receptor 2, Toll-Like Receptor 4, Bone Morphogenetic Protein 2, Biglycan

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