Development of a Laboratory Model of Aortic Valve Calcification

2013 ◽  
Author(s):  
Stephen Biddle ◽  
Clara Seaman ◽  
Philippe Sucosky
Keyword(s):  
Aortic Valve ◽  
Disease Progression ◽  
Aortic Valve Disease ◽  
Valve Disease ◽  
Heart Valve Disease ◽  
Laboratory Model ◽  
Aortic Valve Calcification ◽  
Hemodynamic Changes ◽  
Calcific Aortic Valve Disease ◽  
The U.S

Calcific aortic valve disease (CAVD) is the most prevalent heart valve disease in the U.S. and is characterized by the formation of calcific lesions within the valve leaflets [1]. The emerging hemodynamic theory of CAVD pathogenesis assumes a link between gradual hemodynamic alterations caused by the growing lesions and further disease progression [2–5]. In order to test this hypothesis, it is necessary to quantify the hemodynamic changes experienced downstream of a calcifying valve.

scholarly journals Creation of disease-inspired biomaterial environments to mimic pathological events in early calcific aortic valve disease

2017 ◽  
Vol 115 (3) ◽  
pp. E363-E371 ◽  
Author(s):  
Ana M. Porras ◽  
Jennifer A. Westlund ◽  
Austin D. Evans ◽  
Kristyn S. Masters
Keyword(s):  
Aortic Valve ◽  
Disease Progression ◽  
Aortic Valve Disease ◽  
Low Density Lipoprotein ◽  
Treatment Strategies ◽  
Density Lipoprotein ◽  
Valve Disease ◽  
Calcific Aortic Valve Disease ◽  
Valve Lesion

An insufficient understanding of calcific aortic valve disease (CAVD) pathogenesis remains a major obstacle in developing treatment strategies for this disease. The aim of the present study was to create engineered environments that mimic the earliest known features of CAVD and apply this in vitro platform to decipher relationships relevant to early valve lesion pathobiology. Glycosaminoglycan (GAG) enrichment is a dominant hallmark of early CAVD, but culture of valvular interstitial cells (VICs) in biomaterial environments containing pathological amounts of hyaluronic acid (HA) or chondroitin sulfate (CS) did not directly increase indicators of disease progression such as VIC activation or inflammatory cytokine production. However, HA-enriched matrices increased production of vascular endothelial growth factor (VEGF), while matrices displaying pathological levels of CS were effective at retaining lipoproteins, whose deposition is also found in early CAVD. Retained oxidized low-density lipoprotein (oxLDL), in turn, stimulated myofibroblastic VIC differentiation and secretion of numerous inflammatory cytokines. OxLDL also increased VIC deposition of GAGs, thereby creating a positive feedback loop to further enrich GAG content and promote disease progression. Using this disease-inspired in vitro platform, we were able to model a complex, multistep pathological sequence, with our findings suggesting distinct roles for individual GAGs in outcomes related to valve lesion progression, as well as key differences in cell–lipoprotein interactions compared with atherosclerosis. We propose a pathogenesis cascade that may be relevant to understanding early CAVD and envision the extension of such models to investigate other tissue pathologies or test pharmacological treatments.

Abstract P098: Inhibitory Role of Notch1 in Calcific Aortic Valve Disease Is Mediated by Sox9

2011 ◽  
Vol 109 (suppl_1) ◽  
Author(s):  
Chetan P Hans ◽  
Asha Acharya ◽  
Sara N Koenig ◽  
Haley A Nichols ◽  
Cristi L Galindo ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Notch Signaling ◽  
Signaling Pathway ◽  
Aortic Valve Disease ◽  
Notch Signaling Pathway ◽  
Valve Disease ◽  
Calcium Deposition ◽  
Aortic Valve Calcification ◽  
Calcific Aortic Valve Disease ◽  
Valve Calcification

Introduction: Aortic valve calcification is the most common form of valvular heart disease; however the mechanism(s) underlying calcific aortic valve disease (CAVD) are unknown. NOTCH1 mutations are associated with aortic valve malformations and adult-onset calcification in families with inherited disease. The Notch signaling pathway is critical for multiple cell differentiation processes, but its role in the development of CAVD is not well understood. Objective: To investigate the molecular changes associated with the calcification of aortic valve that occurs with inhibition of Notch signaling. Methods and Results: The expression of Notch signaling pathway members was validated in the aortic valve cusps from adult mice, and examination of diseased human aortic valves revealed decreased expression of NOTCH1 in areas of calcium deposition. To identify downstream mediators of Notch1 signaling, we examined gene expression changes that occur with chemical inhibition of Notch signaling in rat aortic valve interstitial cells (AVICs). We found significant downregulation of many cartilage-specific genes that constitute the valve extracellular matrix (ECM). Analysis of these cartilage-specific genes demonstrated that several were transcriptional targets of Sox9, a master regulator of chondrogenesis, which has been previously shown to be essential for proper valve development and maintenance. Utilizing an in vitro porcine aortic valve calcification model system, inhibition of Notch activity resulted in accelerated calcification while stimulation of Notch signaling attenuated the calcific process. Finally, utilizing transfection studies, addition of Sox9 was able to prevent the calcification of porcine AVICs that occurs with Notch inhibition. Conclusions: Loss of Notch signaling contributes to aortic valve calcification by a Sox9-dependent mechanism. Further elucidation of the Notch1-Sox9 molecular pathway and its role in the maintenance of the ECM will lead to an improved mechanistic understanding of aortic valve calcification and development of novel therapeutic strategies for CAVD.

Cardamonin inhibits osteogenic differentiation of human valve interstitial cells and ameliorates aortic valve calcification via interfering NF-κB/NLRP3 inflammasome pathway

2021 ◽  
Author(s):  
Chunli wang ◽  
Yi Xia ◽  
Linghang Qu ◽  
Yanju Liu ◽  
Xianqiong Liu ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Osteogenic Differentiation ◽  
Nlrp3 Inflammasome ◽  
Aortic Valve Disease ◽  
Interstitial Cells ◽  
Valve Disease ◽  
Aortic Valve Calcification ◽  
Calcific Aortic Valve Disease ◽  
Valve Calcification ◽  
Valve Interstitial Cells

Cardamonin (CDM) is a natural chalcone with strong anti-inflammatory properties. Inflammation-induced osteogenic changes in valve interstitial cells (VICs) play crucial roles in the development of calcific aortic valve disease (CAVD),...

scholarly journals Evogliptin Suppresses Calcific Aortic Valve Disease by Attenuating Inflammation, Fibrosis, and Calcification

Cells ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 57
Author(s):  
Bongkun Choi ◽  
Eun-Young Kim ◽  
Ji-Eun Kim ◽  
Soyoon Oh ◽  
Si-On Park ◽  
...  
Keyword(s):  
Animal Models ◽  
Aortic Valve ◽  
Aortic Valve Disease ◽  
Rabbit Model ◽  
Cytokine Expression ◽  
Rate Of Change ◽  
Valve Disease ◽  
High Cholesterol Diet ◽  
Calcific Aortic Valve Disease ◽  
Valvular Calcification

Calcific aortic valve disease (CAVD) accompanies inflammatory cell infiltration, fibrosis, and ultimately calcification of the valve leaflets. We previously demonstrated that dipeptidyl peptidase-4 (DPP-4) is responsible for the progression of aortic valvular calcification in CAVD animal models. As evogliptin, one of the DPP-4 inhibitors displays high specific accumulation in cardiac tissue, we here evaluated its therapeutic potency for attenuating valvular calcification in CAVD animal models. Evogliptin administration markedly reduced calcific deposition accompanied by a reduction in proinflammatory cytokine expression in endothelial nitric oxide synthase-deficient mice in vivo, and significantly ameliorated the mineralization of the primary human valvular interstitial cells (VICs), with a reduction in the mRNA expression of bone-associated and fibrosis-related genes in vitro. In addition, evogliptin ameliorated the rate of change in the transaortic peak velocity and mean pressure gradients in our rabbit model as assessed by echocardiography. Importantly, evogliptin administration in a rabbit model was found to suppress the effects of a high-cholesterol diet and of vitamin D2-driven fibrosis in association with a reduction in macrophage infiltration and calcific deposition in aortic valves. These results have indicated that evogliptin prohibits inflammatory cytokine expression, fibrosis, and calcification in a CAVD animal model, suggesting its potential as a selective therapeutic agent for the inhibition of valvular calcification during CAVD progression.

scholarly journals Metabolomics in Severe Aortic Stenosis Reveals Intermediates of Nitric Oxide Synthesis as Most Distinctive Markers

2021 ◽  
Vol 22 (7) ◽  
pp. 3569
Author(s):  
Beau Olivier van van Driel ◽  
Maike Schuldt ◽  
Sila Algül ◽  
Evgeni Levin ◽  
Ahmet Güclü ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Cardiac Surgery ◽  
Aortic Valve ◽  
Aortic Stenosis ◽  
Western Blot ◽  
Aortic Valve Disease ◽  
Metabolic Profile ◽  
Valve Disease ◽  
Healthy Controls ◽  
Calcific Aortic Valve Disease

Background: Calcific aortic valve disease (CAVD) is a rapidly growing global health problem with an estimated 12.6 million cases globally in 2017 and a 112% increase of deaths since 1990 due to aging and population growth. CAVD may develop into aortic stenosis (AS) by progressive narrowing of the aortic valve. AS is underdiagnosed, and if treatment by aortic valve replacement (AVR) is delayed, this leads to poor recovery of cardiac function, absence of symptomatic improvement and marked increase of mortality. Considering the current limitations to define the stage of AS-induced cardiac remodeling, there is need for a novel method to aid in the diagnosis of AS and timing of intervention, which may be found in metabolomics profiling of patients. Methods: Serum samples of nine healthy controls and 10 AS patients before and after AVR were analyzed by untargeted mass spectrometry. Multivariate modeling was performed to determine a metabolic profile of 30 serum metabolites which distinguishes AS patients from controls. Human cardiac microvascular endothelial cells (CMECs) were incubated with serum of the AS patients and then stained for ICAM-1 with Western Blot to analyze the effect of AS patient serum on endothelial cell activation. Results: The top 30 metabolic profile strongly distinguishes AS patients from healthy controls and includes 17 metabolites related to nitric oxide metabolism and 12 metabolites related to inflammation, in line with the known pathomechanism for calcific aortic valve disease. Nine metabolites correlate strongly with left ventricular mass, of which three show reversal back to control values after AVR. Western blot analysis of CMECs incubated with AS patient sera shows a significant reduction (14%) in ICAM-1 in AS samples taken after AVR compared to AS patient sera before AVR. Conclusion: Our study defined a top 30 metabolic profile with biological and clinical relevance, which may be used as blood biomarker to identify AS patients in need of cardiac surgery. Future studies are warranted in patients with mild-to-moderate AS to determine if these metabolites reflect disease severity and can be used to identify AS patients in need of cardiac surgery.

scholarly journals Identification of key genes in calcific aortic valve disease via weighted gene co-expression network analysis

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Jin-Yu Sun ◽  
Yang Hua ◽  
Hui Shen ◽  
Qiang Qu ◽  
Jun-Yan Kan ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Network Analysis ◽  
Aortic Valve ◽  
Aortic Valve Disease ◽  
Expression Profiles ◽  
Enrichment Analysis ◽  
Valve Disease ◽  
Hub Genes ◽  
Calcific Aortic Valve Disease ◽  
Underlying Mechanisms

Abstract Background Calcific aortic valve disease (CAVD) is the most common subclass of valve heart disease in the elderly population and a primary cause of aortic valve stenosis. However, the underlying mechanisms remain unclear. Methods The gene expression profiles of GSE83453, GSE51472, and GSE12644 were analyzed by ‘limma’ and ‘weighted gene co-expression network analysis (WGCNA)’ package in R to identify differentially expressed genes (DEGs) and key modules associated with CAVD, respectively. Then, enrichment analysis was performed based on Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway, DisGeNET, and TRRUST database. Protein–protein interaction network was constructed using the overlapped genes of DEGs and key modules, and we identified the top 5 hub genes by mixed character calculation. Results We identified the blue and yellow modules as the key modules. Enrichment analysis showed that leukocyte migration, extracellular matrix, and extracellular matrix structural constituent were significantly enriched. SPP1, TNC, SCG2, FAM20A, and CD52 were identified as hub genes, and their expression levels in calcified or normal aortic valve samples were illustrated, respectively. Conclusions This study suggested that SPP1, TNC, SCG2, FAM20A, and CD52 might be hub genes associated with CAVD. Further studies are required to elucidate the underlying mechanisms and provide potential therapeutic targets.

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