Kevin Kiesworo MS , Michael R. MacArthur PhD , Peter Kip MD, PhD , Thomas Agius MS , Diane Macabrey MS , Martine Lambelet BS , Lauriane Hamard PhD , C.-Keith Ozaki MD , James R. Mitchell PhD , Sébastien Déglise MD , Sarah J. Mitchell PhD , Florent Allagnat PhD , Alban Longchamp MD, PhD
{"title":"Cystathionine-γ-lyase overexpression modulates oxidized nicotinamide adenine dinucleotide biosynthesis and enhances neovascularization","authors":"Kevin Kiesworo MS , Michael R. MacArthur PhD , Peter Kip MD, PhD , Thomas Agius MS , Diane Macabrey MS , Martine Lambelet BS , Lauriane Hamard PhD , C.-Keith Ozaki MD , James R. Mitchell PhD , Sébastien Déglise MD , Sarah J. Mitchell PhD , Florent Allagnat PhD , Alban Longchamp MD, PhD","doi":"10.1016/j.jvssci.2022.11.003","DOIUrl":"10.1016/j.jvssci.2022.11.003","url":null,"abstract":"<div><h3>Objective</h3><p>Hydrogen sulfide is a proangiogenic gas produced primarily by the transsulfuration enzyme cystathionine-γ-lyase (CGL). CGL-dependent hydrogen sulfide production is required for neovascularization in models of peripheral arterial disease. However, the benefits of increasing endogenous CGL and its mechanism of action have not yet been elucidated.</p></div><div><h3>Methods</h3><p>Male whole body CGL-overexpressing transgenic (CGL<sup>Tg</sup>) mice and wild-type (WT) littermates (C57BL/6J) were subjected to the hindlimb ischemia model (age, 10-12 weeks). Functional recovery was assessed via the treadmill exercise endurance test. Leg perfusion was measured by laser Doppler imaging and vascular endothelial-cadherin immunostaining. To examine the angiogenic potential, aortic ring sprouting assay and postnatal mouse retinal vasculature development studies were performed. Finally, comparative metabolomics analysis, oxidized/reduced nicotinamide adenine dinucleotide (NAD<sup>+</sup>/NADH) analysis, and quantitative real-time polymerase chain reaction were performed on CGL<sup>WT</sup> and CGL<sup>Tg</sup> gastrocnemius muscle.</p></div><div><h3>Results</h3><p>The restoration of blood flow occurred more rapidly in CGL<sup>Tg</sup> mice. Compared with the CGL<sup>WT</sup> mice, the median ± standard deviation running distance and time were increased for the CGL<sup>Tg</sup> mice after femoral artery ligation (159 ± 53 m vs 291 ± 74 m [<em>P</em> < .005] and 17 ± 4 minutes vs 27 ± 5 minutes [<em>P</em> < .05], respectively). Consistently, in the CGL<sup>Tg</sup> ischemic gastrocnemius muscle, the capillary density was increased fourfold (0.05 ± 0.02 vs 0.20 ± 0.12; <em>P</em> < .005). Ex vivo, the endothelial cell (EC) sprouting length was increased in aorta isolated from CGL<sup>Tg</sup> mice, especially when cultured in VEGFA (vascular endothelial growth factor A)-only media (63 ± 2 pixels vs 146 ± 52 pixels; <em>P</em> < .05). Metabolomics analysis demonstrated a higher level of niacinamide, a precursor of NAD<sup>+</sup>/NADH in the muscle of CGL<sup>Tg</sup> mice (61.4 × 10<sup>6</sup> ± 5.9 × 10<sup>6</sup> vs 72.4 ± 7.7 × 10<sup>6</sup> area under the curve; <em>P</em> < .05). Similarly, the NAD<sup>+</sup> salvage pathway gene expression was increased in CGL<sup>Tg</sup> gastrocnemius muscle. Finally, CGL overexpression or supplementation with the NAD<sup>+</sup> precursor nicotinamide mononucleotide improved EC migration in vitro (wound closure: control, 35% ± 9%; CGL, 55% ± 11%; nicotinamide mononucleotide, 42% ± 13%; <em>P</em> < .05).</p></div><div><h3>Conclusions</h3><p>Our results have demonstrated that CGL overexpression improves the neovascularization of skeletal muscle on hindlimb ischemia. These effects correlated with changes in the NAD pathway, which improved EC migration.</p></div>","PeriodicalId":74035,"journal":{"name":"JVS-vascular science","volume":"4 ","pages":"Article 100095"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9958478/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9369038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Arielle Bellissard MD , Nabil Chakfe MD, PhD , Salomé Kuntz MD, MSc , Delphine Dion MSc , Lory Schmitt , Frédéric Heim PhD , Anne Lejay MD, PhD
{"title":"Degradation phenomena on last generations of polyethylene terephthalate knitted vascular prostheses","authors":"Arielle Bellissard MD , Nabil Chakfe MD, PhD , Salomé Kuntz MD, MSc , Delphine Dion MSc , Lory Schmitt , Frédéric Heim PhD , Anne Lejay MD, PhD","doi":"10.1016/j.jvssci.2023.01.001","DOIUrl":"10.1016/j.jvssci.2023.01.001","url":null,"abstract":"<div><h3>Objectives</h3><p>The aim of this study was to analyze a series of new generations of explanted knitted polyethylene terephthalate (PET) vascular grafts (VGs) presenting nonanastomotic degradations according to preoperative computed tomography angiography (CTA) when available in order to better understand the mechanisms leading to rupture.</p></div><div><h3>Methods</h3><p>Explanted knitted PET VGs were collected as part of the Geprovas European Collaborative Retrieval Program. VGs implanted after 1990 presenting a nonanastomotic rupture of the fabric were included. Clinical data and pre-explantation CTA data when available were retrieved for each VG. The ruptures were characterized by macroscopic examination and optical microscopy according to a standardized protocol.</p></div><div><h3>Results</h3><p>Nineteen explants were collected across 11 European centers, 13 were implanted as infrainguinal bypasses, 3 at the aortic level, and 1 as an axillobifemoral bypass. The mean implantation duration was 9.2 years. Pre-explantation CTA data were available for 8 VGs and showed false aneurysms at the adductor canal level on 4 VGs, at the inguinal ligament level on 2 VGs, and in the proximal or middle third thigh level on 3 VGs. Examination revealed longitudinal ruptures on 9 explanted VGs (EVGs), transversal ruptures on 15 EVGs, 45°-oriented ruptures on 5 EVGs, V-shaped ruptures on 7 EVGs, and punctiform ruptures on 2 EVGs. Ruptures involved the remeshing line on 11 EVGs, the guideline on 10 EVGs, and the crimping valley on 15 EVGs.</p><p>At the microscopic level, two main degradation phenomena could be identified: a decrease in the density of the meshing and local ruptures of the PET fibers. Fourteen EVGs presented a loosening of the remeshing line and 17 EVGs an attenuation of the crimping.</p></div><div><h3>Conclusions</h3><p>New-generation PET VG degradation seems to result from both anatomic constraints and intrinsic textile structure phenomena.</p></div>","PeriodicalId":74035,"journal":{"name":"JVS-vascular science","volume":"4 ","pages":"Article 100097"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/75/25/main.PMC10165261.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9458181","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Roger T. Tomihama MD , Justin R. Camara MD , Sharon C. Kiang MD
{"title":"Machine learning analysis of confounding variables of a convolutional neural network specific for abdominal aortic aneurysms","authors":"Roger T. Tomihama MD , Justin R. Camara MD , Sharon C. Kiang MD","doi":"10.1016/j.jvssci.2022.11.004","DOIUrl":"10.1016/j.jvssci.2022.11.004","url":null,"abstract":"<div><h3>Objective</h3><p>To identify confounding variables influencing the accuracy of a convolutional neural network (CNN) specific for infrarenal abdominal aortic aneurysms (AAAs) on computed tomography angiograms (CTAs).</p></div><div><h3>Methods</h3><p>A Health Insurance Portability and Accountability Act-compliant, institutional review board-approved, retrospective study analyzed abdominopelvic CTA scans from 200 patients with infrarenal AAAs and 200 propensity-matched control patients. An AAA-specific trained CNN was developed by the application of transfer learning to the VGG-16 base model using model training, validation, and testing techniques. Model accuracy and area under the curve were analyzed based on data sets (selected, balanced, or unbalanced), aneurysm size, extra-abdominal extension, dissections, and mural thrombus. Misjudgments were analyzed by review of heatmaps, via gradient weighted class activation, overlaid on CTA images.</p></div><div><h3>Results</h3><p>The trained custom CNN model reported high test group accuracies of 94.1%, 99.1%, and 99.6% and area under the curve of 0.9900, 0.9998, and 0.9993 in selected (n = 120), balanced (n = 3704), and unbalanced image sets (n = 31,899), respectively. Despite an eightfold difference between balanced and unbalanced image sets, the CNN model demonstrated high test group sensitivities (98.7% vs 98.9%) and specificities (99.7% vs 99.3%) in unbalanced and balanced image sets, respectively. For aneurysm size, the CNN model demonstrates decreasing misjudgments as aneurysm size increases: 47% (16/34) for aneurysms <3.3 cm, 32% (11/34) for aneurysms 3.3 to 5 cm, and 20% (7/34) for aneurysms >5 cm. Aneurysms containing measurable mural thrombus were over-represented within type II (false-negative) misjudgments compared with type I (false-positive) misjudgments (71% vs 15%, <em>P</em> < .05). Inclusion of extra-abdominal aneurysm extension (thoracic or iliac artery) or dissection flaps in these imaging sets did not decrease the model's overall accuracy, indicating that the model performance was excellent without the need to clean the data set of confounding or comorbid diagnoses.</p></div><div><h3>Conclusions</h3><p>Analysis of an AAA-specific CNN model can accurately screen and identify infrarenal AAAs on CTA despite varying pathology and quantitative data sets. The highest anatomic misjudgments were with small aneurysms (<3.3 cm) or the presence of mural thrombus. Accuracy of the CNN model is maintained despite the inclusion of extra-abdominal pathology and imbalanced data sets.</p></div>","PeriodicalId":74035,"journal":{"name":"JVS-vascular science","volume":"4 ","pages":"Article 100096"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/a6/a7/main.PMC10245322.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9607150","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Judit Csore , Christof Karmonik , Alan B. Lumsden , Trisha L. Roy
{"title":"Semiautomated Classification of Peripheral Artery Disease Lesion Composition From Multicontrast Magnetic Resonance Histology at 9..4 Tesla with A Two-Dimensional Convolutional Neural Network Variational AutoEncoder Algorithm","authors":"Judit Csore , Christof Karmonik , Alan B. Lumsden , Trisha L. Roy","doi":"10.1016/j.jvssci.2023.100148","DOIUrl":"https://doi.org/10.1016/j.jvssci.2023.100148","url":null,"abstract":"","PeriodicalId":74035,"journal":{"name":"JVS-vascular science","volume":"4 ","pages":"Article 100148"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666350323000524/pdfft?md5=d7987633550e946ecf59849b1e56bd88&pid=1-s2.0-S2666350323000524-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139107262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rodrigo Meade BS , Yang Chao MD, PhD , Nikolai Harroun MD , Chenglong Li MD , Shahab Hafezi MD , Fong-Fu Hsu PhD , Clay F. Semenkovich MD , Mohamed A. Zayed MD, PhD, MBA
{"title":"Ceramides in peripheral arterial plaque lead to endothelial cell dysfunction","authors":"Rodrigo Meade BS , Yang Chao MD, PhD , Nikolai Harroun MD , Chenglong Li MD , Shahab Hafezi MD , Fong-Fu Hsu PhD , Clay F. Semenkovich MD , Mohamed A. Zayed MD, PhD, MBA","doi":"10.1016/j.jvssci.2023.100181","DOIUrl":"10.1016/j.jvssci.2023.100181","url":null,"abstract":"<div><h3>Background</h3><p>Peripheral arterial atheroprogression is increasingly prevalent, and is a risk factor for major limb amputations in individuals with risk factors such as diabetes. We previously demonstrated that bioactive lipids are significantly altered in arterial tissue of individuals with diabetes and advanced peripheral arterial disease.</p></div><div><h3>Methods</h3><p>Here we evaluated whether sphingolipid ceramide 18:1/16:0 (C16) is a cellular regulator in endothelial cells and peripheral tibial arterial tissue in individuals with diabetes.</p></div><div><h3>Results</h3><p>We observed that C16 is the single most elevated ceramide in peripheral arterial tissue from below the knee in individuals with diabetes (11% increase, <em>P</em> < .05). C16 content in tibial arterial tissue positively correlates with sphingomyelin (SPM) content in patients with and without diabetes (r<sup>2</sup> = 0.5, <em>P</em> < .005; r<sup>2</sup> = 0.17, <em>P</em> < .05; respectively). Tibial arteries of individuals with diabetes demonstrated no difference in <em>CERS6</em> expression (encoding ceramide synthase 6; the predominate ceramide synthesis enzyme), but higher <em>SMPD</em> expression (encoding sphingomyelin phosphodiesterase that catalyzes ceramide synthesis from sphingomyelins; <em>P</em> < .05). <em>SMPD4,</em> but not <em>SMPD2</em>, was particularly elevated in maximally diseased (Max) tibial arterial segments (<em>P</em> < .05). In vitro, exogenous C16 caused endothelial cells (HUVECs) to have decreased proliferation (<em>P</em> < .03), increased apoptosis (<em>P</em> < .003), and decreased autophagy (<em>P</em> < .008). Selective knockdown of <em>SMPD2</em> and <em>SMPD4</em> decreased native production of C16 (<em>P</em> < .01 and <em>P</em> < .001, respectively), but only knockdown of SMPD4 rescued cellular proliferation (<em>P</em> < .005) following exogenous supplementation with C16.</p></div><div><h3>Conclusions</h3><p>Our findings suggest that C16 is a tissue biomarker for peripheral arterial disease severity in the setting of diabetes, and can impact endothelial cell viability and function.</p></div><div><h3>Clinical relevance</h3><p>Peripheral arterial disease and its end-stage manifestation known as chronic limb-threatening ischemia (CLTI) represent ongoing prevalent and intricate medical challenges. Individuals with diabetes have a heightened risk of developing CLTI and experiencing its complications, including wounds, ulcers, and major amputations. In the present study, we conducted a comprehensive examination of the molecular lipid composition within arterial segments from individuals with CLTI, and with and without diabetes. Our investigations unveiled a striking revelation: the sphingolipid ceramide 18:1/16:0 emerged as the predominant ceramide species that was significantly elevated in the peripheral arterial intima below the knee in patients with diabetes. Moreover, this heightened cera","PeriodicalId":74035,"journal":{"name":"JVS-vascular science","volume":"4 ","pages":"Article 100181"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2666350323000858/pdfft?md5=3d3bd95adba87869a0086af3cb8d6207&pid=1-s2.0-S2666350323000858-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135670049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Thrombosis in the pathogenesis of abdominal aortic aneurysm","authors":"Jack Bontekoe MD , Jon Matsumura MD , Bo Liu PhD","doi":"10.1016/j.jvssci.2023.100106","DOIUrl":"10.1016/j.jvssci.2023.100106","url":null,"abstract":"<div><h3>Background</h3><p>Abdominal aortic aneurysms (AAAs) are a relatively common vascular pathology of the elderly with high morbidity potential. Irreversible degeneration of the aortic wall leads to lethal rupture if left untreated. Nearly all AAAs contain intraluminal thrombus (ILT) to a varying degree, yet the mechanisms explaining how thrombosis is disturbed in AAA are relatively unknown. This review examined the thrombotic complications associated with AAA, the impact of thrombosis on AAA surgical outcomes and AAA pathogenesis, and the use of antithrombotic therapy in the management of this disease.</p></div><div><h3>Methods</h3><p>A literature search of the PubMed database was conducted using relevant keywords related to thrombosis and AAAs.</p></div><div><h3>Results</h3><p>Thrombotic complications are relatively infrequent in AAA yet carry significant morbidity risks. The ILT can impact endovascular aneurysm repair by limiting anatomic suitability and influence the risk of endoleaks. Many of the pathologic mechanisms involved in AAA development, including hemodynamics, inflammation, oxidative stress, and aortic wall remodeling, contain pathways that interact with thrombosis. Conversely, the ILT can also be a source of biochemical stress and exacerbate these aneurysmal processes. In animal AAA models, antithrombotic therapies have shown favorable results in preventing and stabilizing AAA. Antiplatelet agents may be beneficial for reducing risks of major adverse cardiovascular events in AAA patients; however, neither antiplatelet nor anticoagulation is currently used solely for the management of AAA.</p></div><div><h3>Conclusions</h3><p>Thrombosis and ILT may have detrimental effects on AAA growth, rupture risk, and patient outcomes, yet there is limited understanding of the pathologic thrombotic mechanisms in aneurysmal disease at the molecular level. Preventing ILT using platelet and coagulation inhibitors may be a reasonable theoretical target for aneurysm progression and stability; however, the practical benefits of current antithrombotic therapies in AAA are unclear. Further research is needed to demonstrate the extent to which thrombosis impacts AAA pathogenesis and to develop novel pharmacologic strategies for the medical management of this disease.</p></div>","PeriodicalId":74035,"journal":{"name":"JVS-vascular science","volume":"4 ","pages":"Article 100106"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ftp.ncbi.nlm.nih.gov/pub/pmc/oa_pdf/83/0b/main.PMC10410173.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"9978642","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}