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Ito S, Amioka N, Franklin MK, Wang P, Liang CL, Katsumata Y, Cai L, Temel RE, Daugherty A, Lu HS, Sawada H. Association of NOTCH3 With Elastic Fiber Dispersion in the Infrarenal Abdominal Aorta of Cynomolgus Monkeys. Arterioscler Thromb Vasc Biol 2023; 43:2301-2311. [PMID: 37855127 PMCID: PMC10843096 DOI: 10.1161/atvbaha.123.319244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Accepted: 10/02/2023] [Indexed: 10/20/2023]
Abstract
BACKGROUND The regional heterogeneity of vascular components and transcriptomes is an important determinant of aortic biology. This notion has been explored in multiple mouse studies. In the present study, we examined the regional heterogeneity of aortas in nonhuman primates. METHODS Aortic samples were harvested from the ascending, descending thoracic, suprarenal, and infrarenal regions of young control monkeys and adult monkeys with high fructose consumption for 3 years. The regional heterogeneity of aortic structure and transcriptomes was examined by histological and bulk RNA sequencing analyses, respectively. RESULTS Immunostaining of CD31 and αSMA (alpha-smooth muscle actin) revealed that endothelial and smooth muscle cells were distributed homogeneously across the aortic regions. In contrast, elastic fibers were less abundant and dispersed in the infrarenal aorta compared with other regions and associated with collagen deposition. Bulk RNA sequencing identified a distinct transcriptome related to the Notch signaling pathway in the infrarenal aorta with significantly increased NOTCH3 mRNA compared with other regions. Immunostaining revealed that NOTCH3 protein was increased in the media of the infrarenal aorta. The abundance of medial NOTCH3 was positively correlated with the dispersion of elastic fibers. Adult cynomolgus monkeys with high fructose consumption displayed vascular wall remodeling, such as smooth muscle cell loss and elastic fiber disruption, predominantly in the infrarenal region. The correlation between NOTCH3 and elastic fiber dispersion was enhanced in these monkeys. CONCLUSIONS Aortas of young cynomolgus monkeys display regional heterogeneity of their transcriptome and the structure of elastin and collagens. Elastic fibers in the infrarenal aorta are dispersed along with upregulation of medial NOTCH3.
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Affiliation(s)
- Sohei Ito
- Saha Cardiovascular Research Center, College of Medicine
| | - Naofumi Amioka
- Saha Cardiovascular Research Center, College of Medicine
| | | | - Pengjun Wang
- Saha Cardiovascular Research Center, College of Medicine
| | | | - Yuriko Katsumata
- Department of Biostatistics, College of Public Health, University of Kentucky, KY
- Sanders-Brown Center on Aging, University of Kentucky, KY
| | - Lei Cai
- Saha Cardiovascular Research Center, College of Medicine
| | - Ryan E. Temel
- Saha Cardiovascular Research Center, College of Medicine
- Saha Aortic Center, College of Medicine, University of Kentucky, KY
- Department of Physiology, College of Medicine, University of Kentucky, KY
| | - Alan Daugherty
- Saha Cardiovascular Research Center, College of Medicine
- Saha Aortic Center, College of Medicine, University of Kentucky, KY
- Department of Physiology, College of Medicine, University of Kentucky, KY
| | - Hong S. Lu
- Saha Cardiovascular Research Center, College of Medicine
- Saha Aortic Center, College of Medicine, University of Kentucky, KY
- Department of Physiology, College of Medicine, University of Kentucky, KY
| | - Hisashi Sawada
- Saha Cardiovascular Research Center, College of Medicine
- Saha Aortic Center, College of Medicine, University of Kentucky, KY
- Department of Physiology, College of Medicine, University of Kentucky, KY
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Ito S, Amioka N, Franklin MK, Wang P, Liang CL, Katsumata Y, Cai L, Temel RE, Daugherty A, Lu HS, Sawada H. Association of NOTCH3 with Elastic Fiber Dispersion in the Infrarenal Abdominal Aorta of Cynomolgus Monkeys. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.04.530901. [PMID: 37767086 PMCID: PMC10522327 DOI: 10.1101/2023.03.04.530901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/29/2023]
Abstract
Background The regional heterogeneity of vascular components and transcriptomes is an important determinant of aortic biology. This notion has been explored in multiple mouse studies. In the present study, we examined the regional heterogeneity of aortas in non-human primates. Methods Aortic samples were harvested from the ascending, descending, suprarenal, and infrarenal regions of young control monkeys and adult monkeys provided with high fructose for 3 years. The regional heterogeneity of aortic structure and transcriptomes was examined by histological and bulk RNA sequencing analyses. Results Immunostaining of CD31 and αSMA revealed that endothelial and smooth muscle cells were distributed homogeneously across the aortic regions. In contrast, elastic fibers were less abundant and dispersed in the infrarenal aorta compared to other regions and associated with collagen deposition. Bulk RNA sequencing identified a distinct transcriptome related to the Notch signaling pathway in the infrarenal aorta with significantly increased NOTCH3 mRNA compared to other regions. Immunostaining revealed that NOTCH3 protein was increased in the media of the infrarenal aorta. The abundance of medial NOTCH3 was positively correlated with the dispersion of elastic fibers. Adult cynomolgus monkeys provided with high fructose displayed vascular wall remodeling, such as smooth muscle cell loss and elastic fiber disruption, predominantly in the infrarenal region. The correlation between NOTCH3 and elastic fiber dispersion was enhanced in these monkeys. Conclusions Aortas of young cynomolgus monkeys display regional heterogeneity of their transcriptome and the structure of elastin and collagens. Elastic fibers in the infrarenal aorta are dispersed along with upregulation of medial NOTCH3. HIGHLIGHTS - The present study determined the regional heterogeneity of aortas from cynomolgus monkeys.- Aortas of young cynomolgus monkeys displayed region-specific aortic structure and transcriptomes.- Elastic fibers were dispersed in the infrarenal aorta along with increased NOTCH3 abundance in the media. GRAPHIC ABSTRACT
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The Role of Obesity, Inflammation and Sphingolipids in the Development of an Abdominal Aortic Aneurysm. Nutrients 2022; 14:nu14122438. [PMID: 35745168 PMCID: PMC9229568 DOI: 10.3390/nu14122438] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 06/03/2022] [Accepted: 06/11/2022] [Indexed: 02/06/2023] Open
Abstract
Abdominal aortic aneurysm (AAA) is a local dilatation of the vessel equal to or exceeding 3 cm. It is a disease with a long preclinical period commonly without any symptoms in its initial stage. Undiagnosed for years, aneurysm often leads to death due to vessel rupture. The basis of AAA pathogenesis is inflammation, which is often associated with the excess of adipose tissue, especially perivascular adipose tissue, which synthesizes adipocytokines that exert a significant influence on the formation of aneurysms. Pro-inflammatory cytokines such as resistin, leptin, and TNFα have been shown to induce changes leading to the formation of aneurysms, while adiponectin is the only known compound that is secreted by adipose tissue and limits the development of aneurysms. However, in obesity, adiponectin levels decline. Moreover, inflammation is associated with an increase in the amount of macrophages infiltrating adipose tissue, which are the source of matrix metalloproteinases (MMP) involved in the degradation of the extracellular matrix, which are an important factor in the formation of aneurysms. In addition, an excess of body fat is associated with altered sphingolipid metabolism. It has been shown that among sphingolipids, there are compounds that play an opposite role in the cell: ceramide is a pro-apoptotic compound that mediates the development of inflammation, while sphingosine-1-phosphate exerts pro-proliferative and anti-inflammatory effects. It has been shown that the increase in the level of ceramide is associated with a decrease in the concentration of adiponectin, an increase in the concentration of TNFα, MMP-9 and reactive oxygen species (which contribute to the apoptosis of vascular smooth muscle cell). The available data indicate a potential relationship between obesity, inflammation and disturbed sphingolipid metabolism with the formation of aneurysms; therefore, the aim of this study was to systematize the current knowledge on the role of these factors in the pathogenesis of abdominal aortic aneurysm.
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Gao F, Chen B, Zhou T, Luo H. Research on the effect of visceral artery Aneurysm's cardiac morphological variation on hemodynamic situation based on time-resolved CT-scan and computational fluid dynamics. COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE 2022; 221:106928. [PMID: 35701249 DOI: 10.1016/j.cmpb.2022.106928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 05/30/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
BACKGROUND AND OBJECTIVE Muscular arteries and related aneurysms keep deforming during the cardiac cycle. However, current patient-specific computational fluid dynamics (CFD) analyses of aneurysms are usually based on individual cardiac phase images. The cardiac deformation and displacement characteristics of muscle arteries and aneurysms, as well as their impact on CFD results, have not been adequately explored. The present study tried to illustrate the cardiac morphological variation of visceral muscular arteries (VMAs) & aneurysms (VAAs) and evaluate its influence on the hemodynamic situation at lesion locations. METHODS Four-dimensional computed tomography angiogram (4D-CTA) images of six patients with VAAs were acquired. Medical image registration is used to capture cardiac variations of VMAs. The steady-state CFD simulation is performed on twelve different time-phase geometries. Deformation, displacement, wall shear stress (WSS), velocity, and pressure values at pathological locations are compared to illustrate the deforming characteristics of VAAs and their influence on CFD simulation results. RESULTS The deformation and displacement characteristics of lesion locations for six specific patients show a pulsatile pattern. Maximum displacements are always less than 4 mm. The ratio fluctuations of endovascular cavity volume and vascular inner wall surface area, which were employed to depict cardiac deformation, are always less than 20%. According to CFD simulations based on deformed VMAs, WSS has a larger coefficient of variation (COV) than velocity and pressure. Except for one patient's WSS, the COVs of different hemodynamic parameters obtained from simulation results are always less than 10%. CONCLUSIONS Based on 4D-CTA images, we confirmed that cardiovascular circulation has a periodic impact on the morphologic characteristics of VMAs. A wave that has extended throughout the studied region is observed. It has a dominant influence on the displacement of VMAs. According to CFD results, the influence of the VMAs' deformation and displacement on different hemodynamic parameters is distinct. The variance in WSS is more prominent compared to pressure and velocity. On most occasions, the influence of the VMAs' periodic deformation and displacement on simulation results is insignificant. However, the variant simulation results induced by deforming VMAs cannot be simply ignored.
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Affiliation(s)
- Fan Gao
- Department of Simulation Science and Technology, Boea Wisdom (Hangzhou) Network Technology Co., Ltd, Hangzhou 310000, China.
| | - Bing Chen
- Division of Vascular Surgery, Department of Surgery, Second Affiliated Hospital of Medical College, Zhejiang University, Hangzhou 310052, China.
| | - Tao Zhou
- Department of Simulation Science and Technology, Boea Wisdom (Hangzhou) Network Technology Co., Ltd, Hangzhou 310000, China.
| | - Huan Luo
- Department of Simulation Science and Technology, Boea Wisdom (Hangzhou) Network Technology Co., Ltd, Hangzhou 310000, China.
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Plana E, Oto J, Medina P, Herranz R, Fernández-Pardo Á, Requejo L, Miralles M. Thrombospondins in human aortic aneurysms. IUBMB Life 2022; 74:982-994. [PMID: 35293116 DOI: 10.1002/iub.2610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 02/08/2022] [Accepted: 02/12/2022] [Indexed: 11/08/2022]
Abstract
Thrombospondins are a family of matricellular proteins with a multimeric structure that is known to be involved in several biological and pathological processes. Their relationship with vascular disorders has raised special interest recently. Aortic aneurysms are related to the impairment of vascular remodeling, in which extracellular matrix proteins seem to play an important role. Thus, research in thrombospondins, and their potential role in aneurysm development is progressively gaining importance. Nevertheless, studies showing thrombospondin dysregulation in human samples are still scarce. Although studies performed in vitro and in vivo models are essential to understand the molecular mechanisms and pathways underlying the disorder, descriptive studies in human samples are also necessary to ascertain their real value as biomarkers and/or novel therapeutic targets. The present article reviews the latest findings regarding the role of thrombospondins in aortic aneurysm development, paying particular attention to the studies performed in human samples.
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Affiliation(s)
- Emma Plana
- Angiology and Vascular Surgery Service, La Fe University and Polytechnic Hospital, Valencia, Spain.,Haemostasis, Thrombosis, Arteriosclerosis and Vascular Biology Research Group, Medical Research Institute Hospital La Fe, Valencia, Spain
| | - Julia Oto
- Haemostasis, Thrombosis, Arteriosclerosis and Vascular Biology Research Group, Medical Research Institute Hospital La Fe, Valencia, Spain
| | - Pilar Medina
- Haemostasis, Thrombosis, Arteriosclerosis and Vascular Biology Research Group, Medical Research Institute Hospital La Fe, Valencia, Spain
| | - Raquel Herranz
- Haemostasis, Thrombosis, Arteriosclerosis and Vascular Biology Research Group, Medical Research Institute Hospital La Fe, Valencia, Spain
| | - Álvaro Fernández-Pardo
- Haemostasis, Thrombosis, Arteriosclerosis and Vascular Biology Research Group, Medical Research Institute Hospital La Fe, Valencia, Spain
| | - Lucia Requejo
- Angiology and Vascular Surgery Service, La Ribera University Hospital, Alzira, Valencia, Spain
| | - Manuel Miralles
- Angiology and Vascular Surgery Service, La Fe University and Polytechnic Hospital, Valencia, Spain.,Haemostasis, Thrombosis, Arteriosclerosis and Vascular Biology Research Group, Medical Research Institute Hospital La Fe, Valencia, Spain.,Department of Surgery, University of Valencia, Valencia, Spain
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Melin LG, Dall JH, Lindholt JS, Steffensen LB, Beck HC, Elkrog SL, Clausen PD, Rasmussen LM, Stubbe J. Cycloastragenol Inhibits Experimental Abdominal Aortic Aneurysm Progression. Biomedicines 2022; 10:biomedicines10020359. [PMID: 35203568 PMCID: PMC8962318 DOI: 10.3390/biomedicines10020359] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/24/2022] [Accepted: 01/30/2022] [Indexed: 02/04/2023] Open
Abstract
The pathogenesis of abdominal aortic aneurysm involves vascular inflammation and elastin degradation. Astragalusradix contains cycloastragenol, which is known to be anti-inflammatory and to protect against elastin degradation. We hypothesized that cycloastragenol supplementation inhibits abdominal aortic aneurysm progression. Abdominal aortic aneurysm was induced in male rats by intraluminal elastase infusion in the infrarenal aorta and treated daily with cycloastragenol (125 mg/kg/day). Aortic expansion was followed weekly by ultrasound for 28 days. Changes in aneurysmal wall composition were analyzed by mRNA levels, histology, zymography and explorative proteomic analyses. At day 28, mean aneurysm diameter was 37% lower in the cycloastragenol group (p < 0.0001). In aneurysm cross sections, elastin content was insignificantly higher in the cycloastragenol group (10.5% ± 5.9% vs. 19.9% ± 16.8%, p = 0.20), with more preserved elastin lamellae structures (p = 0.0003) and without microcalcifications. Aneurysmal matrix metalloprotease-2 activity was reduced by the treatment (p = 0.022). Messenger RNA levels of inflammatory- and anti-oxidative markers did not differ between groups. Explorative proteomic analysis showed no difference in protein levels when adjusting for multiple testing. Among proteins displaying nominal regulation were fibulin-5 (p = 0.02), aquaporin-1 (p = 0.02) and prostacyclin synthase (p = 0.007). Cycloastragenol inhibits experimental abdominal aortic aneurysm progression. The suggested underlying mechanisms involve decreased matrix metalloprotease-2 activity and preservation of elastin and reduced calcification, thus, cycloastragenol could be considered for trial in abdominal aortic aneurysm patients.
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Affiliation(s)
- Leander Gaarde Melin
- Centre for Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital (OUH), 5000 Odense, Denmark; (L.G.M.); (J.H.D.); (J.S.L.); (H.C.B.); (L.M.R.)
- Department of Cardiothoracic and Vascular Surgery, Odense University Hospital, 5000 Odense, Denmark
- Cardiovascular and Renal Research Unit, Institute for Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark; (L.B.S.); (S.L.E.); (P.D.C.)
| | - Julie Husted Dall
- Centre for Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital (OUH), 5000 Odense, Denmark; (L.G.M.); (J.H.D.); (J.S.L.); (H.C.B.); (L.M.R.)
- Department of Cardiothoracic and Vascular Surgery, Odense University Hospital, 5000 Odense, Denmark
- Cardiovascular and Renal Research Unit, Institute for Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark; (L.B.S.); (S.L.E.); (P.D.C.)
| | - Jes S. Lindholt
- Centre for Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital (OUH), 5000 Odense, Denmark; (L.G.M.); (J.H.D.); (J.S.L.); (H.C.B.); (L.M.R.)
- Department of Cardiothoracic and Vascular Surgery, Odense University Hospital, 5000 Odense, Denmark
| | - Lasse B. Steffensen
- Cardiovascular and Renal Research Unit, Institute for Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark; (L.B.S.); (S.L.E.); (P.D.C.)
| | - Hans Christian Beck
- Centre for Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital (OUH), 5000 Odense, Denmark; (L.G.M.); (J.H.D.); (J.S.L.); (H.C.B.); (L.M.R.)
- Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, 5000 Odense, Denmark
| | - Sophie L. Elkrog
- Cardiovascular and Renal Research Unit, Institute for Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark; (L.B.S.); (S.L.E.); (P.D.C.)
| | - Pernille D. Clausen
- Cardiovascular and Renal Research Unit, Institute for Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark; (L.B.S.); (S.L.E.); (P.D.C.)
| | - Lars Melholt Rasmussen
- Centre for Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital (OUH), 5000 Odense, Denmark; (L.G.M.); (J.H.D.); (J.S.L.); (H.C.B.); (L.M.R.)
- Department of Clinical Biochemistry and Pharmacology, Odense University Hospital, 5000 Odense, Denmark
| | - Jane Stubbe
- Centre for Individualized Medicine in Arterial Diseases (CIMA), Odense University Hospital (OUH), 5000 Odense, Denmark; (L.G.M.); (J.H.D.); (J.S.L.); (H.C.B.); (L.M.R.)
- Cardiovascular and Renal Research Unit, Institute for Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark; (L.B.S.); (S.L.E.); (P.D.C.)
- Correspondence: ; Tel.: +45-6550-3709
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Rebecca M, Sripriya K, Bharathselvi M, Shantha B, Vijaya L, Angayarkanni N. Increased Desmosine in the lens capsules is associated with augmented elastin turnover in Pseudoexfoliation syndrome. Exp Eye Res 2021; 215:108898. [PMID: 34929161 DOI: 10.1016/j.exer.2021.108898] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 12/29/2022]
Abstract
Pseudoexfoliation syndrome (PXF) is an idiopathic disease with a high prevalence rate. The elastosis disorder is contributed by genetic and non-genetic factors. Elastin dysregulation associated with the disease mechanism is incompletely understood. This study evaluated the molecules of the elastogenesis machinery in PXF. Lens capsule and aqueous humor (aqH) samples (age/sex-matched) were collected from the eyes with PXF alone and PXF with glaucoma (PXF-G) undergoing Extra Capsular Cataract Extraction (ECCE) surgery. The Elastin turnover was assessed by estimating Desmosine levels in the lens capsules by HPLC analysis. Expression of elastogenesis genes [EMILIN1, CLU, FBN1, FN1, FBLN5, FBLN4 and LOXL1] were evaluated in the lens capsule by qPCR while the proteins were assessed in aqH by western blot analysis. The Desmosine content in the lens capsules were 3-fold and 6-fold elevated in PXF (P = 0.02) and PXF-G (P = 0.01) respectively compared to the cataract-alone, indicating increased elastin degradation. A significant increase in the transcript levels of the CLU, FBLN4, EMILIN1, FBLN5, FN1, FBN1, LOXL1 along with significant changes in protein expression of CLU, FBLN5, FBN1 and LOXL1 signified up-regulation of the elastogenesis machinery. The study provides direct evidence of augmented elastin degradation and turnover in the lens capsule of PXF marked by increased Desmosine content and the expression of proteins involved in mature elastin formation.
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Affiliation(s)
- Manohar Rebecca
- RS Mehta Jain Dept. of Biochemistry and Cell Biology, KBIRVO Block, Vision Research Foundation, Chennai, 600006, India; Tamil Nadu Dr. MGR Medical University, Guindy, Chennai, 600032, India
| | - Krishnamoorthy Sripriya
- Smt. Jadhavbai Nathamal Singhvee Glaucoma Services, Medical Research Foundation, Sankara Nethralaya, Chennai, 600006, India
| | - M Bharathselvi
- RS Mehta Jain Dept. of Biochemistry and Cell Biology, KBIRVO Block, Vision Research Foundation, Chennai, 600006, India
| | - B Shantha
- Smt. Jadhavbai Nathamal Singhvee Glaucoma Services, Medical Research Foundation, Sankara Nethralaya, Chennai, 600006, India
| | - Lingam Vijaya
- Smt. Jadhavbai Nathamal Singhvee Glaucoma Services, Medical Research Foundation, Sankara Nethralaya, Chennai, 600006, India
| | - Narayanasamy Angayarkanni
- RS Mehta Jain Dept. of Biochemistry and Cell Biology, KBIRVO Block, Vision Research Foundation, Chennai, 600006, India.
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Ugajin A, Iwakoshi S, Ichihashi S, Inoue T, Nakai T, Kishida H, Chanoki Y, Tanaka T, Mori H, Kichikawa K. Prediction of Abdominal Aortic Aneurysm Growth After Endovascular Aortic Repair by Measuring Brachial-Ankle Pulse Wave Velocity. Ann Vasc Surg 2021; 81:163-170. [PMID: 34748949 DOI: 10.1016/j.avsg.2021.08.056] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/29/2021] [Accepted: 08/30/2021] [Indexed: 11/01/2022]
Abstract
BACKGROUND Although endovascular aortic repair (EVAR) has become the dominant therapeutic approach for abdominal aortic aneurysm (AAA), continued sac growth after EVAR remains a major concern and is still unpredictable. Since AAA formation is thought to arise from atherosclerotic vascular damage of the aortic wall, we hypothesize that the severity of atherosclerosis in the AAA wall may influence sac growth. Therefore, we investigated whether brachial-ankle pulse wave velocity (baPWV), a marker of atherosclerosis severity obtained by noninvasive automatic devices, can predict sac growth after EVAR. METHODS The data from all patients who underwent elective EVAR for AAA at a single institution from January 2012 to March 2019 were reviewed. We extracted the baPWV before EVAR and divided patients into 2 groups according to the baPWV cut-off value identified by a classification and regression tree (CART). The primary outcome was significant sac growth, defined as an increment of 5 mm or more in aneurysm size after EVAR relative to the aneurysm size before EVAR. Cox regression analysis was performed to assess the potential predictors of sac growth. RESULTS During the follow-up period, 222 consecutive patients underwent elective EVAR for AAA. Of these, 175 patients with a median follow-up period of 36 months were included. The baPWV values were classified as <1854 cm/s (Group 0) in 100 patients and ≥1854 cm/s (Group 1) in 75 patients according to the cut-off value identified by CART. During the follow-up period, 10 (10.0%) patients in Group 0 and 18 (24.0%) patients in Group 1 demonstrated significant sac growth (P = 0.021). Risk factors for significant sac growth included baPWV (hazard ratio [HR], 3.059; 95% confidence interval [CI], 1.41-6.64; P = 0.005), age (HR, 1.078; 95% CI, 1.01-1.16; P = 0.036), and persistent type II endoleak (HR, 3.552; 95% CI, 1.69-7.48; P < 0.001). Multivariate analysis revealed that baPWV remained a significant risk factor for sac growth after adjustment for age (HR, 2.602; 95% CI, 1.15-5.82; P = 0.02) and persistent type II endoleak (HR, 2.957; 95% CI, 1.36-6.43; P = 0.006). CONCLUSIONS The baPWV before EVAR was associated with significant sac growth after EVAR; thus, measuring the baPWV may be useful for assessing the risk of future sac growth in patients after EVAR.
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Affiliation(s)
- Atsushi Ugajin
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan; Department of Radiology, Jichi Medical University, Shimotsuke, Tochigi, Japan
| | - Shinichi Iwakoshi
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan.
| | - Shigeo Ichihashi
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan
| | - Takashi Inoue
- Institute for Clinical Translational Science, Nara Medical University Hospital, Kashihara, Nara, Japan
| | - Takahiro Nakai
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan
| | - Hayato Kishida
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan
| | - Yuto Chanoki
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan
| | - Toshihiro Tanaka
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan
| | - Harushi Mori
- Department of Radiology, Jichi Medical University, Shimotsuke, Tochigi, Japan
| | - Kimihiko Kichikawa
- Department of Radiology, IVR Center, Nara Medical University, Kashihara, Nara, Japan
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Wittig C, Szulcek R. Extracellular Matrix Protein Ratios in the Human Heart and Vessels: How to Distinguish Pathological From Physiological Changes? Front Physiol 2021; 12:708656. [PMID: 34421650 PMCID: PMC8371527 DOI: 10.3389/fphys.2021.708656] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Accepted: 07/14/2021] [Indexed: 12/03/2022] Open
Abstract
Cardiovascular pathology is often accompanied by changes in relative content and/or ratios of structural extracellular matrix (ECM) proteins within the heart and elastic vessels. Three of these proteins, collagen-I, collagen-III, and elastin, make up the bulk of the ECM proteins in these tissues, forming a microenvironment that strongly dictates the tissue biomechanical properties and effectiveness of cardiac and vascular function. In this review, we aim to elucidate how the ratios of collagen-I to collagen-III and elastin to collagen are altered in cardiovascular diseases and the aged individuum. We elaborate on these major cardiovascular ECM proteins in terms of structure, tissue localization, turnover, and physiological function and address how their ratios change in aging, dilated cardiomyopathy, coronary artery disease with myocardial infarction, atrial fibrillation, aortic aneurysms, atherosclerosis, and hypertension. To the end of guiding in vitro modeling approaches, we focus our review on the human heart and aorta, discuss limitations in ECM protein quantification methodology, examine comparability between studies, and highlight potential in vitro applications. In summary, we found collagen-I relative concentration to increase or stay the same in cardiovascular disease, resulting in a tendency for increased collagen-I/collagen-III and decreased elastin/collagen ratios. These ratios were found to fall on a continuous scale with ranges defining distinct pathological states as well as a significant difference between the human heart and aortic ECM protein ratios.
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Affiliation(s)
- Corey Wittig
- Laboratory of in vitro Modeling Systems of Pulmonary Diseases, Institute of Physiology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Robert Szulcek
- Laboratory of in vitro Modeling Systems of Pulmonary Diseases, Institute of Physiology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
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Jadidi M, Sherifova S, Sommer G, Kamenskiy A, Holzapfel GA. Constitutive modeling using structural information on collagen fiber direction and dispersion in human superficial femoral artery specimens of different ages. Acta Biomater 2021; 121:461-474. [PMID: 33279711 PMCID: PMC8464405 DOI: 10.1016/j.actbio.2020.11.046] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2020] [Revised: 11/27/2020] [Accepted: 11/27/2020] [Indexed: 12/29/2022]
Abstract
Arterial mechanics plays an important role in vascular pathophysiology and repair, and advanced imaging can inform constitutive models of vascular behavior. We have measured the mechanical properties of 14 human superficial femoral arteries (SFAs) (age 12-70, mean 48±19 years) using planar biaxial extension, and determined the preferred collagen fiber direction and dispersion using multiphoton microscopy. The collagen fiber direction and dispersion were evaluated using second-harmonic generation imaging and modeled using bivariate von Mises distributions. The microstructures of elastin and collagen were assessed using two-photon fluorescence imaging and conventional bidirectional histology. The mechanical and structural data were used to describe the SFA mechanical behavior using two- and four-fiber family invariant-based constitutive models. Older SFAs were stiffer and mechanically more nonlinear than younger specimens. In the adventitia, collagen fibers were undulated and diagonally-oriented, while in the media, they were straight and circumferentially-oriented. The media was rich in collagen that surrounded the circumferentially-oriented smooth muscle cells, and the elastin was present primarily in the internal and external elastic laminae. Older SFAs had a more circumferential collagen fiber alignment, a decreased circumferential-radial fiber dispersion, but the same circumferential-longitudinal fiber dispersion as younger specimens. Both the two- and the four-fiber family constitutive models were able to capture the experimental data, and the fits were better for the four-fiber family formulation. Our data provide additional details on the SFA intramural structure and inform structurally-based constitutive models.
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11
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Dong H, Jin N, Kannengiesser S, Raterman B, White RD, Kolipaka A. Magnetic resonance elastography for estimating in vivo stiffness of the abdominal aorta using cardiac-gated spin-echo echo-planar imaging: a feasibility study. NMR IN BIOMEDICINE 2021; 34:e4420. [PMID: 33021342 DOI: 10.1002/nbm.4420] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 09/02/2020] [Accepted: 09/10/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION Magnetic resonance elastography (MRE)-derived aortic stiffness is a potential biomarker for multiple cardiovascular diseases. Currently, gradient-recalled echo (GRE) MRE is a widely accepted technique to estimate aortic stiffness. However, multi-slice GRE MRE requires multiple breath-holds (BHs), which can be challenging for patients who cannot consistently hold their breath. The aim of this study was to investigate the feasibility of a multi-slice spin-echo echo-planar imaging (SE-EPI) MRE sequence for quantifying in vivo aortic stiffness using a free-breathing (FB) protocol and a single-BH protocol. METHOD On Scanner 1, 25 healthy subjects participated in the validation of FB SE-EPI against FB GRE. On Scanner 2, another 15 healthy subjects were recruited to compare FB SE-EPI with single-BH SE-EPI. Among all volunteers, five participants were studied on both scanners to investigate the inter-scanner reproducibility of FB SE-EPI aortic MRE. Bland-Altman analysis, Lin's concordance correlation coefficient (LCCC) and coefficient of variation (COV) were evaluated. The phase-difference signal-to-noise ratios (PD SNR) were compared. RESULTS Aortic MRE using FB SE-EPI and FB GRE yielded similar stiffnesses (paired t-test, P = 0.19), with LCCC = 0.97. The FB SE-EPI measurements were reproducible (intra-scanner LCCC = 0.96) and highly repeatable (LCCC = 0.99). The FB SE-EPI MRE was also reproducible across different scanners (inter-scanner LCCC = 0.96). Single-BH SE-EPI scans yielded similar stiffness to FB SE-EPI scans (LCCC = 0.99) and demonstrated a low COV of 2.67% across five repeated measurements. CONCLUSION Multi-slice SE-EPI aortic MRE using an FB protocol or a single-BH protocol is reproducible and repeatable with advantage over multi-slice FB GRE in reducing acquisition time. Additionally, FB SE-EPI MRE provides a potential alternative to BH scans for patients who have challenges in holding their breath.
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Affiliation(s)
- Huiming Dong
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
| | - Ning Jin
- Siemens Medical Solution, Columbus, Ohio, USA
| | | | - Brian Raterman
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Richard D White
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
- Department of Internal Medicine-Division of Cardiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
| | - Arunark Kolipaka
- Department of Radiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
- Department of Biomedical Engineering, The Ohio State University, Columbus, Ohio, USA
- Department of Internal Medicine-Division of Cardiology, The Ohio State University Wexner Medical Center, Columbus, Ohio, USA
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12
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Zhu S, Zhu K, Li J, Lai H, Wang C. Nano-Biomaterials for the Delivery of Therapeutic and Monitoring Cues for Aortic Diseases. Front Bioeng Biotechnol 2020; 8:583879. [PMID: 33224934 PMCID: PMC7674648 DOI: 10.3389/fbioe.2020.583879] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 10/07/2020] [Indexed: 01/09/2023] Open
Abstract
The aorta is the largest artery in the body, so any diseases or conditions which could cause damage to the aorta would put patients at considerable and life-threatening risk. In the management of aortic diseases, the major treatments include drug therapy, endovascular treatment, and surgical treatment, which are of great danger or with a poor prognosis. The delivery of nano-biomaterials provides a potential development trend and an emerging field where we could monitor patients’ conditions and responses to the nanotherapeutics. One of the putative applications of nanotechnology is ultrasensitive monitoring of cardiovascular markers by detecting and identifying aneurysms. Moreover, the use of nanosystems for targeted drug delivery can minimize the systemic side effects and enhance drug positioning and efficacy compared to conventional drug therapies. This review shows some examples of utilizing nano-biomaterials in in vitro organ and cell culture experiments and explains some developing technologies in delivering and monitoring regenerative therapeutics.
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Affiliation(s)
- Shichao Zhu
- Department of Cardiac Surgery, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Kai Zhu
- Department of Cardiac Surgery, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Jun Li
- Department of Cardiac Surgery, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Hao Lai
- Department of Cardiac Surgery, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Institute of Cardiovascular Diseases, Shanghai, China
| | - Chunsheng Wang
- Department of Cardiac Surgery, Zhongshan Hospital, Fudan University, Shanghai, China.,Shanghai Institute of Cardiovascular Diseases, Shanghai, China
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13
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Haslach HW, Gipple J, Harwerth J, Rabin J. Interstitial fluid-solid interaction within aneurysmal and non-pathological human ascending aortic tissue under translational sinusoidal shear deformation. Acta Biomater 2020; 113:452-463. [PMID: 32645439 DOI: 10.1016/j.actbio.2020.06.045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2020] [Revised: 06/25/2020] [Accepted: 06/30/2020] [Indexed: 11/15/2022]
Abstract
The interaction shear force between internal interstitial fluid motion and the solid circumferential-longitudinal medial lamellae helps generate the shear stress involved in dissection of human ascending aorta aneurysmal or non-pathologic tissue. Frequency analysis parameters from the total shear stress versus time response to translational 1 Hz sinusoidal shear deformation over 50 cycles measure the interaction with respect to the three factors: tissue type, sinusoidal deformation amplitude and direction of the shear deformation. Significant 1, 3, and 5 Hz components exist in this order of descending magnitude for shear deformation amplitudes of either 25% or 50% of the specimen length. Evaporation tests indicate that the amount of free water in both aneurysmal and non-pathological tissue is nearly the same. The interstitial fluid-solid interaction under shear deformation is visible in the shoulders of the total shear stress versus time response curve that are caused by the 3 Hz component. During a single deformation cycle, the ratio of the amplitudes of the 3 Hz and the 1 Hz components measures the normalized amount of interaction. Under translational sinusoidal shear deformation at 25% amplitude, this interaction ratio is statistically smaller in non-pathologic than in aneurysmal human ascending aortic tissue in the circumferential direction. The frequency analysis parameters provide evidence that the structural changes in aneurysmal tissue induce an increase in the interstitial fluid-medial solid interaction shear force which contributes to the propensity for aneurysmal rupture. STATEMENT OF SIGNIFICANCE: Circumferential shear force between the interstitial fluid and medial lamellae within the human ascending aortic wall is demonstrably greater in aneurysmal than non-pathologic tissue. This force likely increases with medial elastin degeneration and may facilitate the dissection propensity in aneurysmal tissue. The 3 Hz component in frequency analyses of the total shear stress versus time curve produced by 1 Hz sinusoidal translational shear deformation measures the fluid-solid interaction shear force that is otherwise difficult to isolate. This non-standard examination of the interstitial fluid interaction helps clarify clinical mechanical implications of structural differences between aneurysmal and non-pathologic human ascending aortic tissue. The aneurysmal dissection susceptibility does not appear to depend on the amount of interstitial fluid or the wall thickness compared to non-pathologic tissue.
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Affiliation(s)
- Henry W Haslach
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA.
| | - Jenna Gipple
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
| | - Jason Harwerth
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA
| | - Joseph Rabin
- Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, USA; R. Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, Baltimore, MD, USA
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14
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Gurung R, Choong AM, Woo CC, Foo R, Sorokin V. Genetic and Epigenetic Mechanisms Underlying Vascular Smooth Muscle Cell Phenotypic Modulation in Abdominal Aortic Aneurysm. Int J Mol Sci 2020; 21:ijms21176334. [PMID: 32878347 PMCID: PMC7504666 DOI: 10.3390/ijms21176334] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 08/24/2020] [Accepted: 08/26/2020] [Indexed: 12/12/2022] Open
Abstract
Abdominal aortic aneurysm (AAA) refers to the localized dilatation of the infra-renal aorta, in which the diameter exceeds 3.0 cm. Loss of vascular smooth muscle cells, degradation of the extracellular matrix (ECM), vascular inflammation, and oxidative stress are hallmarks of AAA pathogenesis and contribute to the progressive thinning of the media and adventitia of the aortic wall. With increasing AAA diameter, and left untreated, aortic rupture ensues with high mortality. Collective evidence of recent genetic and epigenetic studies has shown that phenotypic modulation of smooth muscle cells (SMCs) towards dedifferentiation and proliferative state, which associate with the ECM remodeling of the vascular wall and accompanied with increased cell senescence and inflammation, is seen in in vitro and in vivo models of the disease. This review critically analyses existing publications on the genetic and epigenetic mechanisms implicated in the complex role of SMCs within the aortic wall in AAA formation and reflects the importance of SMCs plasticity in AAA formation. Although evidence from the wide variety of mouse models is convincing, how this knowledge is applied to human biology needs to be addressed urgently leveraging modern in vitro and in vivo experimental technology.
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Affiliation(s)
- Rijan Gurung
- Cardiovascular Research Institute, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 9, Singapore 119228, Singapore; (R.G.); (R.F.)
- Genome Institute of Singapore, A*STAR, 60 Biopolis Street, Genome, Singapore 138672, Singapore
| | - Andrew Mark Choong
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 8, Singapore 119228, Singapore; (A.M.C.); (C.C.W.)
- Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, National University Health System, 1E Kent Ridge Road, NUHS Tower Block, Level 9, Singapore 119228, Singapore
| | - Chin Cheng Woo
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 8, Singapore 119228, Singapore; (A.M.C.); (C.C.W.)
| | - Roger Foo
- Cardiovascular Research Institute, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 9, Singapore 119228, Singapore; (R.G.); (R.F.)
- Genome Institute of Singapore, A*STAR, 60 Biopolis Street, Genome, Singapore 138672, Singapore
| | - Vitaly Sorokin
- Department of Surgery, Yong Loo Lin School of Medicine, National University of Singapore, 1E Kent Ridge Road, NUHS Tower Block, Level 8, Singapore 119228, Singapore; (A.M.C.); (C.C.W.)
- Department of Cardiac, Thoracic and Vascular Surgery, National University Hospital, National University Health System, 1E Kent Ridge Road, NUHS Tower Block, Level 9, Singapore 119228, Singapore
- Correspondence: ; Tel.: +65-6779-5555
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15
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Wen H, Wang M, Gong S, Li X, Meng J, Wen J, Wang Y, Zhang S, Xin S. Human Umbilical Cord Mesenchymal Stem Cells Attenuate Abdominal Aortic Aneurysm Progression in Sprague-Dawley Rats: Implication of Vascular Smooth Muscle Cell Phenotypic Modulation. Stem Cells Dev 2020; 29:981-993. [PMID: 32486904 PMCID: PMC7410303 DOI: 10.1089/scd.2020.0058] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Abdominal aortic aneurysm (AAA) is life-threatening, for which efficient nonsurgical treatment strategy has not been available so far. Several previous studies investigating the therapeutic effect of mesenchymal stem cells (MSCs) in AAA indicated that MSCs could inhibit aneurysmal inflammatory responses and extracellular matrix destruction, and suppress aneurysm occurrence and expansion. Vascular smooth muscle cell (VSMC) phenotypic plasticity is reported to be predisposed in AAA initiation and progression. However, little is known about the effect of MSCs on VSMC phenotypic modulation in AAA. In this study, we investigate the therapeutic efficacy of umbilical cord mesenchymal stem cells (UC-MSCs) in elastase-induced AAA model and evaluate the effect of UC-MSC on VSMC phenotypic regulation. We demonstrate that the intravenous injection of UC-MSC attenuates elastase-induced aneurysmal expansion, reduces elastin degradation and fragmentation, inhibits MMPs and TNF-α expression, and preserves and/or restores VSMC contractile phenotype in AAA. Taken together, these results highlight the therapeutic and VSMC phenotypic modulation effects of UC-MSC in AAA progression, which further indicates the potential of applying UC-MSC as an alternative treatment candidate for AAA.
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Affiliation(s)
- Hao Wen
- Department of Vascular Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China.,Key Laboratory of Pathogenesis, Prevention and Therapeutics of Aortic Aneurysm in Liaoning Province, Shenyang, China.,Regenerative Medicine Research Center of China Medical University, Shenyang, China
| | - Mingjing Wang
- Department of Pharmacology, China Medical University, Shenyang, China
| | - Shiqiang Gong
- Department of Pharmacology, China Medical University, Shenyang, China
| | - Xintong Li
- Department of Vascular Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China.,Key Laboratory of Pathogenesis, Prevention and Therapeutics of Aortic Aneurysm in Liaoning Province, Shenyang, China.,Regenerative Medicine Research Center of China Medical University, Shenyang, China
| | - Jinze Meng
- Department of Pharmacology, China Medical University, Shenyang, China
| | - Jie Wen
- Department of Ultrasonography, Inner Mongolia Baotou City Central Hospital, Baotou, China
| | - Yifei Wang
- Department of Pharmacology, China Medical University, Shenyang, China
| | - Shuqing Zhang
- Department of Pharmacology, China Medical University, Shenyang, China
| | - Shijie Xin
- Department of Vascular Surgery, The First Affiliated Hospital of China Medical University, Shenyang, China.,Key Laboratory of Pathogenesis, Prevention and Therapeutics of Aortic Aneurysm in Liaoning Province, Shenyang, China.,Regenerative Medicine Research Center of China Medical University, Shenyang, China
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16
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Li L, Ma W, Pan S, Li Y, Wang H, Wang B, Khalil RA. MiR-126a-5p limits the formation of abdominal aortic aneurysm in mice and decreases ADAMTS-4 expression. J Cell Mol Med 2020; 24:7896-7906. [PMID: 32469162 PMCID: PMC7348185 DOI: 10.1111/jcmm.15422] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 04/06/2020] [Accepted: 05/07/2020] [Indexed: 12/14/2022] Open
Abstract
Abdominal aortic aneurysm (AAA) is a serious vascular disease featured by inflammatory infiltration in aortic wall, aortic dilatation and extracellular matrix (ECM) degradation. Dysregulation of microRNAs (miRNAs) is implicated in AAA progress. By profiling miRNA expression in mouse AAA tissues and control aortas, we noted that miR-126a-5p was down-regulated by 18-fold in AAA samples, which was further validated with real-time qPCR. This study was performed to investigate miR-126a-5p's role in AAA formation. In vivo, a 28-d infusion of 1 μg/kg/min Angiotensin (Ang) II was used to induce AAA formation in Apoe-/- mice. MiR-126a-5p (20 mg/kg; MIMAT0000137) or negative control (NC) agomirs were intravenously injected to mice on days 0, 7, 14 and 21 post-Ang II infusion. Our data showed that miR-126a-5p overexpression significantly improved the survival and reduced aortic dilatation in Ang II-infused mice. Elastic fragment and ECM degradation induced by Ang II were also ameliorated by miR-126a-5p. A strong up-regulation of ADAM metallopeptidase with thrombospondin type 1 motif 4 (ADAMTS-4), a secreted proteinase that regulates matrix degradation, was observed in smooth muscle cells (SMCs) of aortic tunica media, which was inhibited by miR-126a-5p. Dual-luciferase results demonstrated ADAMTS-4 as a new and valid target for miR-126a-5p. In vitro, human aortic SMCs (hASMCs) were stimulated by Ang II. Gain- and loss-of-function experiments further confirmed that miR-126-5p prevented Ang II-induced ECM degradation, and reduced ADAMTS-4 expression in hASMCs. In summary, our work demonstrates that miR-126a-5p limits experimental AAA formation and reduces ADAMTS-4 expression in abdominal aortas.
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Affiliation(s)
- Lei Li
- Department of Vascular SurgeryThe Second Affiliated Hospital of Dalian Medical UniversityDalianChina
- Vascular Surgery Research LaboratoriesDivision of Vascular and Endovascular SurgeryBrigham and Women's HospitalHarvard Medical SchoolBostonMAUSA
| | - Wei Ma
- Department of AnatomyDalian Medical UniversityDalianChina
| | - Shuang Pan
- Department of PhysiologySchool of Basic MedicineJinzhou Medical UniversityJinzhouChina
| | - Yongqi Li
- Graduate School of Comprehensive Human SciencesUniversity of TsukubaTsukubaJapan
| | - Han Wang
- Department of Vascular SurgeryDalian University Affiliated Xinhua HospitalDalianChina
| | - Biao Wang
- Department of Biochemistry and Molecular BiologySchool of Life SciencesChina Medical UniversityShenyangChina
| | - Raouf A. Khalil
- Vascular Surgery Research LaboratoriesDivision of Vascular and Endovascular SurgeryBrigham and Women's HospitalHarvard Medical SchoolBostonMAUSA
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17
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Langton AK, Tsoureli-Nikita E, Merrick H, Zhao X, Antoniou C, Stratigos A, Akhtar R, Derby B, Sherratt MJ, Watson RE, Griffiths CE. The systemic influence of chronic smoking on skin structure and mechanical function. J Pathol 2020; 251:420-428. [PMID: 32472631 DOI: 10.1002/path.5476] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 05/15/2020] [Accepted: 05/20/2020] [Indexed: 12/21/2022]
Abstract
One of the major functions of human skin is to provide protection from the environment. Although we cannot entirely avoid, for example, sun exposure, it is likely that exposure to other environmental factors could affect cutaneous function. A number of studies have identified smoking as one such factor that leads to both facial wrinkle formation and a decline in skin function. In addition to the direct physical effects of tobacco smoke on skin, its inhalation has additional profound systemic effects for the smoker. The adverse effects on the respiratory and cardiovascular systems from smoking are well known. Central to the pathological changes associated with smoking is the elastic fibre, a key component of the extracellular matrices of lungs. In this study we examined the systemic effect of chronic smoking (>40 cigarettes/day; >5 years) on the histology of the cutaneous elastic fibre system, the nanostructure and mechanics of one of its key components, the fibrillin-rich microfibril, and the micromechanical stiffness of the dermis and epidermis. We show that photoprotected skin of chronic smokers exhibits significant remodelling of the elastic fibre network (both elastin and fibrillin-rich microfibrils) as compared to the skin of age- and sex-matched non-smokers. This remodelling is not associated with increased gelatinase activity (as identified by in situ zymography). Histological remodelling is accompanied by significant ultrastructural changes to extracted fibrillin-rich microfibrils. Finally, using scanning acoustic microscopy, we demonstrated that chronic smoking significantly increases the stiffness of both the dermis and the epidermis. Taken together, these data suggest an unappreciated systemic effect of chronic inhalation of tobacco smoke on the cutaneous elastic fibre network. Such changes may in part underlie the skin wrinkling and loss of skin elasticity associated with smoking. © 2020 The Authors. The Journal of Pathology published by John Wiley & Sons Ltd on behalf of Pathological Society of Great Britain and Ireland.
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Affiliation(s)
- Abigail K Langton
- Centre for Dermatology Research, The University of Manchester & Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK.,NIHR Manchester Biomedical Research Centre, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Evridiki Tsoureli-Nikita
- First Department of Dermatology, Andreas Syggros Hospital of Cutaneous & Venereal Diseases, Athens University Medical School, Athens, Greece
| | - Holly Merrick
- Centre for Dermatology Research, The University of Manchester & Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Xuegen Zhao
- School of Materials, The University of Manchester, Manchester, UK
| | - Christina Antoniou
- First Department of Dermatology, Andreas Syggros Hospital of Cutaneous & Venereal Diseases, Athens University Medical School, Athens, Greece
| | - Alexander Stratigos
- First Department of Dermatology, Andreas Syggros Hospital of Cutaneous & Venereal Diseases, Athens University Medical School, Athens, Greece
| | - Riaz Akhtar
- Department of Mechanical, Materials and Aerospace Engineering, School of Engineering, University of Liverpool, Liverpool, UK
| | - Brian Derby
- School of Materials, The University of Manchester, Manchester, UK
| | - Michael J Sherratt
- Division of Cell Matrix Biology & Regenerative Medicine, Manchester Academic Health Science Centre, The University of Manchester, Manchester, UK
| | - Rachel Eb Watson
- Centre for Dermatology Research, The University of Manchester & Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK.,NIHR Manchester Biomedical Research Centre, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
| | - Christopher Em Griffiths
- Centre for Dermatology Research, The University of Manchester & Salford Royal NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK.,NIHR Manchester Biomedical Research Centre, Manchester University NHS Foundation Trust, Manchester Academic Health Science Centre, Manchester, UK
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18
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Lane BA, Wang X, Lessner SM, Vyavahare NR, Eberth JF. Targeted Gold Nanoparticles as an Indicator of Mechanical Damage in an Elastase Model of Aortic Aneurysm. Ann Biomed Eng 2020; 48:2268-2278. [PMID: 32240423 DOI: 10.1007/s10439-020-02500-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Accepted: 03/27/2020] [Indexed: 12/23/2022]
Abstract
Elastin is a key structural protein and its pathological degradation deterministic in aortic aneurysm (AA) outcomes. Unfortunately, using current diagnostic and clinical surveillance techniques the integrity of the elastic fiber network can only be assessed invasively. To address this, we employed fragmented elastin-targeting gold nanoparticles (EL-AuNPs) as a diagnostic tool for the evaluation of unruptured AAs. Electron dense EL-AuNPs were visualized within AAs using micro-computed tomography (micro-CT) and the corresponding Gold-to-Tissue volume ratios quantified. The Gold-to-Tissue volume ratios correlated strongly with the concentration (0, 0.5, or 10 U/mL) of infused porcine pancreatic elastase and therefore the degree of elastin damage. Hyperspectral mapping confirmed the spatial targeting of the EL-AuNPs to the sites of damaged elastin. Nonparametric Spearman's rank correlation indicated that the micro-CT-based Gold-to-Tissue volume ratios had a strong correlation with loaded (ρ = 0.867, p-val = 0.015) and unloaded (ρ = 0.830, p-val = 0.005) vessel diameter, percent dilation (ρ = 0.976, p-val = 0.015), circumferential stress (ρ = 0.673, p-val = 0.007), loaded (ρ = - 0.673, p-val = 0.017) and unloaded (ρ = - 0.697, p-val = 0.031) wall thicknesses, circumferential stretch (ρ = - 0.7234, p-val = 0.018), and lumen area compliance (ρ = - 0.831, p-val = 0.003). Likewise, in terms of axial force and axial stress vs. stretch, the post-elastase vessels were stiffer. Collectively, these findings suggest that, when combined with CT imaging, EL-AuNPs can be used as a powerful tool in the non-destructive estimation of mechanical and geometric features of AAs.
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Affiliation(s)
- Brooks A Lane
- Biomedical Engineering Program, University of South Carolina, Columbia, SC, 29208, USA
| | - Xiaoying Wang
- Bioengineering Department, Clemson University, Clemson, SC, USA
| | - Susan M Lessner
- Biomedical Engineering Program, University of South Carolina, Columbia, SC, 29208, USA.,Cell Biology and Anatomy Department, University of South Carolina, Columbia, SC, USA
| | | | - John F Eberth
- Biomedical Engineering Program, University of South Carolina, Columbia, SC, 29208, USA. .,Cell Biology and Anatomy Department, University of South Carolina, Columbia, SC, USA.
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19
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Cavinato C, Badel P, Krasny W, Avril S, Morin C. Experimental Characterization of Adventitial Collagen Fiber Kinematics Using Second-Harmonic Generation Imaging Microscopy: Similarities and Differences Across Arteries, Species and Testing Conditions. MULTI-SCALE EXTRACELLULAR MATRIX MECHANICS AND MECHANOBIOLOGY 2020. [DOI: 10.1007/978-3-030-20182-1_5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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20
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Korenczuk CE, Dhume RY, Liao KK, Barocas VH. Ex Vivo Mechanical Tests and Multiscale Computational Modeling Highlight the Importance of Intramural Shear Stress in Ascending Thoracic Aortic Aneurysms. J Biomech Eng 2019; 141:121010. [PMID: 31633165 PMCID: PMC7104749 DOI: 10.1115/1.4045270] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 10/17/2019] [Indexed: 11/08/2022]
Abstract
Ascending thoracic aortic aneurysms (ATAAs) are anatomically complex in terms of architecture and geometry, and both complexities contribute to unpredictability of ATAA dissection and rupture in vivo. The goal of this work was to examine the mechanism of ATAA failure using a combination of detailed mechanical tests on human tissue and a multiscale computational model. We used (1) multiple, geometrically diverse, mechanical tests to characterize tissue properties; (2) a multiscale computational model to translate those results into a broadly usable form; and (3) a model-based computer simulation of the response of an ATAA to the stresses generated by the blood pressure. Mechanical tests were performed in uniaxial extension, biaxial extension, shear lap, and peel geometries. ATAA tissue was strongest in circumferential extension and weakest in shear, presumably because of the collagen and elastin in the arterial lamellae. A multiscale, fiber-based model using different fiber properties for collagen, elastin, and interlamellar connections was specified to match all of the experimental data with one parameter set. Finally, this model was used to simulate ATAA inflation using a realistic geometry. The predicted tissue failure occurred in regions of high stress, as expected; initial failure events involved almost entirely interlamellar connections, consistent with arterial dissection-the elastic lamellae remain intact, but the connections between them fail. The failure of the interlamellar connections, paired with the weakness of the tissue under shear loading, is suggestive that shear stress within the tissue may contribute to ATAA dissection.
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Affiliation(s)
- Christopher E. Korenczuk
- Department of Biomedical Engineering, University of Minnesota,7-105 Nils Hasselmo Hall, 312 Church Street SE, Minneapolis, MN 55455e-mail:
| | - Rohit Y. Dhume
- Department of Mechanical Engineering, University of Minnesota,7-105 Nils Hasselmo Hall, 312 Church Street SE, Minneapolis, MN 55455e-mail:
| | - Kenneth K. Liao
- Department of Surgery, University of Minnesota,420 Delaware Street SE, MMC 207, Minneapolis, MN 55455e-mail:
| | - Victor H. Barocas
- Department of Biomedical Engineering, University of Minnesota,7-105 Nils Hasselmo Hall, 312 Church Street SE, Minneapolis, MN 55455e-mail:
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21
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Sherifova S, Holzapfel GA. Biomechanics of aortic wall failure with a focus on dissection and aneurysm: A review. Acta Biomater 2019; 99:1-17. [PMID: 31419563 PMCID: PMC6851434 DOI: 10.1016/j.actbio.2019.08.017] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 08/05/2019] [Accepted: 08/08/2019] [Indexed: 12/12/2022]
Abstract
Aortic dissections and aortic aneurysms are fatal events characterized by structural changes to the aortic wall. The maximum diameter criterion, typically used for aneurysm rupture risk estimations, has been challenged by more sophisticated biomechanically motivated models in the past. Although these models are very helpful for the clinicians in decision-making, they do not attempt to capture material failure. Following a short overview of the microstructure of the aorta, we analyze the failure mechanisms involved in the dissection and rupture by considering also traumatic rupture. We continue with a literature review of experimental studies relevant to quantify tissue strength. More specifically, we summarize more extensively uniaxial tensile, bulge inflation and peeling tests, and we also specify trouser, direct tension and in-plane shear tests. Finally we analyze biomechanically motivated models to predict rupture risk. Based on the findings of the reviewed studies and the rather large variations in tissue strength, we propose that an appropriate material failure criterion for aortic tissues should also reflect the microstructure in order to be effective. STATEMENT OF SIGNIFICANCE: Aortic dissections and aortic aneurysms are fatal events characterized by structural changes to the aortic wall. Despite the advances in medical, biomedical and biomechanical research, the mortality rates of aneurysms and dissections remain high. The present review article summarizes experimental studies that quantify the aortic wall strength and it discusses biomechanically motivated models to predict rupture risk. We identified contradictory observations and a large variation within and between data sets, which may be due to biological variations, different sample sizes, differences in experimental protocols, etc. Based on the findings of the reviewed literature and the rather large variations in tissue strength, it is proposed that an appropriate criterion for aortic failure should also reflect the microstructure.
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Affiliation(s)
- Selda Sherifova
- Institute of Biomechanics, Graz University of Technology, Stremayrgasse 16/2, 8010 Graz, Austria
| | - Gerhard A Holzapfel
- Institute of Biomechanics, Graz University of Technology, Stremayrgasse 16/2, 8010 Graz, Austria; Department of Structural Engineering, Norwegian Institute of Science and Technology (NTNU), 7491 Trondheim, Norway.
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22
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Gu BH, Sprouse ML, Madison MC, Hong MJ, Yuan X, Tung HY, Landers CT, Song LZ, Corry DB, Bettini M, Kheradmand F. A Novel Animal Model of Emphysema Induced by Anti-Elastin Autoimmunity. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2019; 203:349-359. [PMID: 31182478 PMCID: PMC6688643 DOI: 10.4049/jimmunol.1900113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 05/13/2019] [Indexed: 12/21/2022]
Abstract
Loss of immune tolerance to self-antigens can promote chronic inflammation and disrupt the normal function of multiple organs, including the lungs. Degradation of elastin, a highly insoluble protein and a significant component of the lung structural matrix, generates proinflammatory molecules. Elastin fragments (EFs) have been detected in the serum of smokers with emphysema, and elastin-specific T cells have also been detected in the peripheral blood of smokers with emphysema. However, an animal model that could recapitulate T cell-specific autoimmune responses by initiating and sustaining inflammation in the lungs is lacking. In this study, we report an animal model of autoimmune emphysema mediated by the loss of tolerance to elastin. Mice immunized with a combination of human EFs plus rat EFs but not mouse EFs showed increased infiltration of innate and adaptive immune cells to the lungs and developed emphysema. We cloned and expanded mouse elastin-specific CD4+ T cells from the lung and spleen of immunized mice. Finally, we identified TCR sequences from the autoreactive T cell clones, suggesting possible pathogenic TCRs that can cause loss of immune tolerance against elastin. This new autoimmune model of emphysema provides a useful tool to examine the immunological factors that promote loss of immune tolerance to self.
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Affiliation(s)
- Bon-Hee Gu
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
| | - Maran L Sprouse
- Section of Diabetes and Endocrinology, Department of Pediatrics, McNair Medical Institute, Baylor College of Medicine, Texas Children's Hospital, Houston, TX 77030
| | - Matthew C Madison
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
| | - Monica J Hong
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
| | - Xiaoyi Yuan
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
| | - Hui-Ying Tung
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
| | - Cameron T Landers
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
| | - Li-Zhen Song
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
| | - David B Corry
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030
- Center for Translational Research in Inflammatory Diseases, Michael E. DeBakey VA Medical Center, Houston, TX 77030
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030; and
- Biology of Inflammation Center, Baylor College of Medicine, Houston, TX 77030
| | - Maria Bettini
- Section of Diabetes and Endocrinology, Department of Pediatrics, McNair Medical Institute, Baylor College of Medicine, Texas Children's Hospital, Houston, TX 77030;
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030; and
- Biology of Inflammation Center, Baylor College of Medicine, Houston, TX 77030
| | - Farrah Kheradmand
- Department of Medicine, Pulmonary and Critical Care, Baylor College of Medicine, Houston, TX 77030;
- Center for Translational Research in Inflammatory Diseases, Michael E. DeBakey VA Medical Center, Houston, TX 77030
- Department of Pathology and Immunology, Baylor College of Medicine, Houston, TX 77030; and
- Biology of Inflammation Center, Baylor College of Medicine, Houston, TX 77030
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23
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Contributions of Glycosaminoglycans to Collagen Fiber Recruitment in Constitutive Modeling of Arterial Mechanics. J Biomech 2018; 82:211-219. [PMID: 30415914 DOI: 10.1016/j.jbiomech.2018.10.031] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 10/20/2018] [Accepted: 10/23/2018] [Indexed: 01/08/2023]
Abstract
The contribution of glycosaminoglycans (GAGs) to the biological and mechanical functions of biological tissue has emerged as an important area of research. GAGs provide structural basis for the organization and assembly of extracellular matrix (ECM). The mechanics of tissue with low GAG content can be indirectly affected by the interaction of GAGs with collagen fibers, which have long been known to be one of the primary contributors to soft tissue mechanics. Our earlier study showed that enzymatic GAG depletion results in straighter collagen fibers that are recruited at lower levels of stretch, and a corresponding shift in earlier arterial stiffening (Mattson et al., 2016). In this study, the effect of GAGs on collagen fiber recruitment was studied through a structure-based constitutive model. The model incorporates structural information, such as fiber orientation distribution, content, and recruitment of medial elastin, medial collagen, and adventitial collagen fibers. The model was first used to study planar biaxial tensile stress-stretch behavior of porcine descending thoracic aorta. Changes in elastin and collagen fiber orientation distribution, and collagen fiber recruitment were then incorporated into the model in order to predict the stress-stretch behavior of GAG depleted tissue. Our study shows that incorporating early collagen fiber recruitment into the model predicts the stress-stretch response of GAG depleted tissue reasonably well (rms = 0.141); considering further changes of fiber orientation distribution does not improve the predicting capability (rms = 0.149). Our study suggests an important role of GAGs in arterial mechanics that should be considered in developing constitutive models.
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24
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Wiernicki I, Parafiniuk M, Kolasa-Wołosiuk A, Gutowska I, Kazimierczak A, Clark J, Baranowska-Bosiacka I, Szumilowicz P, Gutowski P. Relationship between aortic wall oxidative stress/proteolytic enzyme expression and intraluminal thrombus thickness indicates a novel pathomechanism in the progression of human abdominal aortic aneurysm. FASEB J 2018; 33:885-895. [PMID: 30351992 DOI: 10.1096/fj.201800633r] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The possibility that oxidative stress promotes degradation of the extracellular matrix and a relationship between intraluminal thrombus (ILT) thickness and proteolytic activity within the abdominal aortic aneurysm (AAA) wall has been suggested. In the present study, the hypothesis that thin ILT is correlated with an increase in oxidative stress-related enzymes and matrix metalloproteinase-9 (MMP-9) expression within the human AAA wall was investigated. We also studied the antioxidant activity of superoxide dismutases, catalase, glutathione peroxidase, glutathione reductase, and thioredoxin within the full-thickness AAA wall and through fluoroimmunohistochemical staining of catalase and MMP-9 expression within the inner and outer media, in relation to ILT thickness. Reactive oxygen species control the degradation and remodeling of the extracellular matrix by up-regulating proteolytic enzymes, such as MMPs. Results showed that oxidative stress and proteolytic enzyme expression were simultaneously, significantly higher within thin thrombus (≤10 mm)-covered aneurysm wall when compared with the wall covered by thick thrombus (≥25 mm). These findings provide the first demonstration, to our knowledge, of a causative link between oxidative stress instigating proteolytic enzyme expression at the tissue level and human AAA development. Presence of a thin circumferential thrombus should always be considered as a risk factor for the greatest increase in aneurysm growth rate and rupture, giving an indication for surgery timing.-Wiernicki, I., Parafiniuk, M., Kolasa-Wołosiuk, A., Gutowska, I., Kazimierczak, A., Clark, J., Baranowska-Bosiacka, I., Szumilowicz, P., Gutowski, P. Relationship between aortic wall oxidative stress/proteolytic enzyme expression and intraluminal thrombus thickness indicates a novel pathomechanism in the progression of human abdominal aortic aneurysm.
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Affiliation(s)
- Ireneusz Wiernicki
- Department of Vascular Surgery and Angiology, Pomeranian Medical University, Szczecin, Poland
| | - Miroslaw Parafiniuk
- Department of Forensic Medicine, Pomeranian Medical University, Szczecin, Poland
| | | | - Izabela Gutowska
- Department of Biochemistry and Human Nutrition, Pomeranian Medical University, Szczecin, Poland
| | - Arkadiusz Kazimierczak
- Department of Vascular Surgery and Angiology, Pomeranian Medical University, Szczecin, Poland
| | - Jeremy Clark
- Department of Clinical and Molecular Biochemistry, Faculty of Laboratory Diagnostics and Molecular Medicine, Pomeranian Medical University, Szczecin, Poland
| | - Irena Baranowska-Bosiacka
- Department of Biochemistry and Medical Chemistry, Faculty of Laboratory Diagnostics and Molecular Medicine, Pomeranian Medical University, Szczecin, Poland
| | - Pawel Szumilowicz
- Department of Vascular Surgery and Angiology, Pomeranian Medical University, Szczecin, Poland
| | - Piotr Gutowski
- Department of Vascular Surgery and Angiology, Pomeranian Medical University, Szczecin, Poland
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25
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Cocciolone AJ, Hawes JZ, Staiculescu MC, Johnson EO, Murshed M, Wagenseil JE. Elastin, arterial mechanics, and cardiovascular disease. Am J Physiol Heart Circ Physiol 2018; 315:H189-H205. [PMID: 29631368 DOI: 10.1152/ajpheart.00087.2018] [Citation(s) in RCA: 154] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Large, elastic arteries are composed of cells and a specialized extracellular matrix that provides reversible elasticity and strength. Elastin is the matrix protein responsible for this reversible elasticity that reduces the workload on the heart and dampens pulsatile flow in distal arteries. Here, we summarize the elastin protein biochemistry, self-association behavior, cross-linking process, and multistep elastic fiber assembly that provide large arteries with their unique mechanical properties. We present measures of passive arterial mechanics that depend on elastic fiber amounts and integrity such as the Windkessel effect, structural and material stiffness, and energy storage. We discuss supravalvular aortic stenosis and autosomal dominant cutis laxa-1, which are genetic disorders caused by mutations in the elastin gene. We present mouse models of supravalvular aortic stenosis, autosomal dominant cutis laxa-1, and graded elastin amounts that have been invaluable for understanding the role of elastin in arterial mechanics and cardiovascular disease. We summarize acquired diseases associated with elastic fiber defects, including hypertension and arterial stiffness, diabetes, obesity, atherosclerosis, calcification, and aneurysms and dissections. We mention animal models that have helped delineate the role of elastic fiber defects in these acquired diseases. We briefly summarize challenges and recent advances in generating functional elastic fibers in tissue-engineered arteries. We conclude with suggestions for future research and opportunities for therapeutic intervention in genetic and acquired elastinopathies.
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Affiliation(s)
- Austin J Cocciolone
- Department of Biomedical Engineering, Washington University , St. Louis, Missouri
| | - Jie Z Hawes
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Marius C Staiculescu
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Elizabeth O Johnson
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Monzur Murshed
- Faculty of Dentistry, Department of Medicine, and Shriners Hospital for Children, McGill University , Montreal, Quebec , Canada
| | - Jessica E Wagenseil
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
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26
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Janssen R, Piscaer I, Wouters EFM. Inhalation therapy for repairing damaged elastin fibers and decelerating elastinolysis in chronic obstructive pulmonary disease. Expert Rev Respir Med 2018; 12:349-360. [DOI: 10.1080/17476348.2018.1460206] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Rob Janssen
- Department of Pulmonary Medicine, Canisius-Wilhelmina Hospital, Nijmegen, Netherlands
| | - Ianthe Piscaer
- Department of Respiratory Medicine, Maastricht University Medical Centre, Maastricht, Netherlands
| | - Emiel FM. Wouters
- Department of Research and Education, Center of Expertise for Chronic Organ Failure(CIRO), Horn, Netherlands
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27
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Li J, Huynh P, Dai A, Wu T, Tu Y, Chow B, Kiriazis H, Du XJ, Bach LA, Wilkinson-Berka JL, Biros E, Walker P, Nataatmadja M, West M, Golledge J, Allen TJ, Cooper ME, Chai Z. Diabetes Reduces Severity of Aortic Aneurysms Depending on the Presence of Cell Division Autoantigen 1 (CDA1). Diabetes 2018; 67:755-768. [PMID: 29311219 DOI: 10.2337/db17-0134] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 01/01/2018] [Indexed: 11/13/2022]
Abstract
Diabetes is a negative risk factor for aortic aneurysm, but the underlying explanation for this phenomenon is unknown. We have previously demonstrated that cell division autoantigen 1 (CDA1), which enhances transforming growth factor-β signaling, is upregulated in diabetes. We hypothesized that CDA1 plays a key role in conferring the protective effect of diabetes against aortic aneurysms. Male wild-type, CDA1 knockout (KO), apolipoprotein E (ApoE) KO, and CDA1/ApoE double-KO (dKO) mice were rendered diabetic. Whereas aneurysms were not observed in diabetic ApoE KO and wild-type mice, 40% of diabetic dKO mice developed aortic aneurysms. These aneurysms were associated with attenuated aortic transforming growth factor-β signaling, reduced expression of various collagens, and increased aortic macrophage infiltration and matrix metalloproteinase 12 expression. In the well-characterized model of angiotensin II-induced aneurysm formation, concomitant diabetes reduced fatal aortic rupture and attenuated suprarenal aortic expansion, changes not seen in dKO mice. Furthermore, aortic CDA1 expression was downregulated ∼70% within biopsies from human abdominal aortic aneurysms. The identification that diabetes is associated with upregulation of vascular CDA1 and that CDA1 deletion in diabetic mice promotes aneurysm formation provides evidence that CDA1 plays a role in diabetes to reduce susceptibility to aneurysm formation.
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Affiliation(s)
- Jiaze Li
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Department of Immunology, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Pacific Huynh
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Department of Immunology, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Aozhi Dai
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Tieqiao Wu
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Yugang Tu
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Bryna Chow
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Helen Kiriazis
- Experimental Cardiology Laboratory, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Xiao-Jun Du
- Experimental Cardiology Laboratory, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Leon A Bach
- Department of Medicine, Central Clinical School, Monash University, Melbourne, Australia
- Department of Endocrinology and Diabetes, Alfred Hospital, Melbourne, Australia
| | | | - Erik Biros
- Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, James Cook University, Townsville, Australia
| | | | - Maria Nataatmadja
- Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, James Cook University, Townsville, Australia
- University of Queensland, Brisbane, Australia
| | - Malcolm West
- Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, James Cook University, Townsville, Australia
- University of Queensland, Brisbane, Australia
| | - Jonathan Golledge
- Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, James Cook University, Townsville, Australia
- University of Queensland, Brisbane, Australia
- Department of Vascular and Endovascular Surgery, Townsville Hospital, Townsville, Australia
| | - Terri J Allen
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Mark E Cooper
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Department of Immunology, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
| | - Zhonglin Chai
- Department of Diabetes, Central Clinical School, Monash University, Melbourne, Australia
- Department of Immunology, Central Clinical School, Monash University, Melbourne, Australia
- Diabetes Division, Baker IDI Heart and Diabetes Institute, Melbourne, Australia
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28
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Rudarakanchana N, Jenkins MP. Hybrid and total endovascular repair of the aortic arch. Br J Surg 2018; 105:315-327. [DOI: 10.1002/bjs.10713] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 09/04/2017] [Indexed: 01/12/2023]
Abstract
Abstract
Background
Recent advances in endovascular technology have enabled minimally invasive repair of the aortic arch, with specifically designed stent-grafts. This article reviews hybrid and total endovascular repair in the management of aortic arch pathology.
Methods
Studies relating to aortic arch management were identified using MEDLINE and Embase, focusing on endovascular repair.
Results
Hybrid arch repair is associated with an early mortality rate of some 12 per cent, and carries significant risk of stroke (up to 15 per cent), paraplegia (up to 6 per cent), retrograde dissection (up to 6·5 per cent) and proximal endoleak (6 per cent). Despite patients being of overall higher perioperative risk, hybrid repair has morbidity and early mortality rates comparable to those of open arch replacement. However, rates of freedom from aortic rupture or reintervention are significantly lower in the longer term, owing to the incidence of endoleak. Total endovascular arch repair may be achieved by the use of parallel stents or in situ fenestration in the emergency setting, or use of custom-made devices (scalloped, fenestrated or branched stent-grafts) in the elective setting. Reports of these relatively novel technologies suggest acceptable short-term outcomes, but long-term data are still awaited.
Conclusion
Repair of aortic arch pathology presents a formidable challenge for endovascular technology. Open aortic arch repair remains the standard in younger, fitter patients, but endovascular technology and experience continue to evolve with encouraging early outcomes and expanding indications.
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Affiliation(s)
- N. Rudarakanchana
- Department of Vascular Surgery, Royal Free Hospital, Royal Free London NHS Foundation Trust, London, UK
| | - M. P. Jenkins
- Department of Vascular Surgery, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK
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29
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Boese AC, Kim SC, Yin KJ, Lee JP, Hamblin MH. Sex differences in vascular physiology and pathophysiology: estrogen and androgen signaling in health and disease. Am J Physiol Heart Circ Physiol 2017. [PMID: 28626075 DOI: 10.1152/ajpheart.00217.2016] [Citation(s) in RCA: 127] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Sex differences between women and men are often overlooked and underappreciated when studying the cardiovascular system. It has been long assumed that men and women are physiologically similar, and this notion has resulted in women being clinically evaluated and treated for cardiovascular pathophysiological complications as men. Currently, there is increased recognition of fundamental sex differences in cardiovascular function, anatomy, cell signaling, and pathophysiology. The National Institutes of Health have enacted guidelines expressly to gain knowledge about ways the sexes differ in both normal function and diseases at the various research levels (molecular, cellular, tissue, and organ system). Greater understanding of these sex differences will be used to steer future directions in the biomedical sciences and translational and clinical research. This review describes sex-based differences in the physiology and pathophysiology of the vasculature, with a special emphasis on sex steroid receptor (estrogen and androgen receptor) signaling and their potential impact on vascular function in health and diseases (e.g., atherosclerosis, hypertension, peripheral artery disease, abdominal aortic aneurysms, cerebral aneurysms, and stroke).
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Affiliation(s)
- Austin C Boese
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana
| | - Seong C Kim
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana
| | - Ke-Jie Yin
- Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Jean-Pyo Lee
- Department of Neurology, Tulane University School of Medicine, New Orleans, Louisiana; and.,Center for Stem Cell Research and Regenerative Medicine, New Orleans, Louisiana
| | - Milton H Hamblin
- Department of Pharmacology, Tulane University School of Medicine, New Orleans, Louisiana;
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30
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Robinson KG, Scott RA, Hesek AM, Woodford EJ, Amir W, Planchon TA, Kiick KL, Akins RE. Reduced arterial elasticity due to surgical skeletonization is ameliorated by abluminal PEG hydrogel. Bioeng Transl Med 2017; 2:222-232. [PMID: 28932820 PMCID: PMC5579730 DOI: 10.1002/btm2.10060] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2016] [Revised: 02/15/2017] [Accepted: 03/06/2017] [Indexed: 12/17/2022] Open
Abstract
Arteries for bypass grafting are harvested either with neighboring tissue attached or as skeletonized vessels that are free of surrounding tissue. There are significant benefits to skeletonization, but reports suggest that skeletonized vessels may develop structural defects and are at risk for atherosclerosis. We investigated the specific short‐term effects of skeletonization on carotid artery biomechanics and microanatomy in a rabbit model. Six carotid arteries were surgically skeletonized. To support healing, three of these received polyethylene glycol hydrogel injected along their exterior surfaces. M‐mode ultrasonography was used to track circumferential cyclic strain in the skeletonized, hydrogel‐treated, and contralateral vessels. On day 21, the arteries were harvested, and vessel structure was assessed by histology, immunofluorescence microscopy, two‐photon elastin autofluorescence, and second harmonic generation (SHG) microscopy. Intimal‐medial thickness appeared unaffected by skeletonization, but the SHG signals indicated significant changes in collagen turnover in the adventitia. Skeletonized arteries also exhibited significantly decreased radial compliance (circumferential cyclic strain dropped ∼30%) and decreased numbers of elastic laminae (9.1 ± 2.0 to 2.3 ± 1.4). Hydrogel treatment protected against these effects with treated vessels maintaining normal mechanical properties. These results indicate that arterial skeletonization triggers immediate effects on vessel remodeling and reduced vessel compliance resulting in specific tissue alterations within 21 days, but that these effects can be attenuated by the placement of hydrogel on the exterior surface of the skeletonized vessel.
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Affiliation(s)
- Karyn G Robinson
- Nemours - Alfred I. duPont Hospital for Children Wilmington DE1 9803
| | - Rebecca A Scott
- Nemours - Alfred I. duPont Hospital for Children Wilmington DE1 9803.,Dept. of Materials Science & Engineering University of Delaware Newark DE 19716
| | - Anne M Hesek
- Nemours - Alfred I. duPont Hospital for Children Wilmington DE1 9803
| | - Edward J Woodford
- Nemours - Alfred I. duPont Hospital for Children Wilmington DE1 9803
| | - Wafa Amir
- Dept. of Physics and Engineering, Optical Science Center for Applied Research Delaware State University Dover DE 19901
| | - Thomas A Planchon
- Dept. of Physics and Engineering, Optical Science Center for Applied Research Delaware State University Dover DE 19901
| | - Kristi L Kiick
- Nemours - Alfred I. duPont Hospital for Children Wilmington DE1 9803.,Dept. of Materials Science & Engineering University of Delaware Newark DE 19716.,Dept. of Biomedical Engineering University of Delaware Newark DE 19716
| | - Robert E Akins
- Nemours - Alfred I. duPont Hospital for Children Wilmington DE1 9803.,Dept. of Materials Science & Engineering University of Delaware Newark DE 19716.,Dept. of Biomedical Engineering University of Delaware Newark DE 19716
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31
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Sénémaud J, Caligiuri G, Etienne H, Delbosc S, Michel JB, Coscas R. Translational Relevance and Recent Advances of Animal Models of Abdominal Aortic Aneurysm. Arterioscler Thromb Vasc Biol 2017; 37:401-410. [DOI: 10.1161/atvbaha.116.308534] [Citation(s) in RCA: 102] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Accepted: 12/21/2016] [Indexed: 01/11/2023]
Abstract
Human abdominal aortic aneurysm (AAA) pathophysiology is not yet completely understood. In conductance arteries, the insoluble extracellular matrix, synthesized by vascular smooth muscle cells, assumes the function of withstanding the intraluminal arterial blood pressure. Progressive loss of this function through extracellular matrix proteolysis is a main feature of AAAs. As most patients are now treated via endovascular approaches, surgical AAA specimens have become rare. Animal models provide valuable complementary insights into AAA pathophysiology. Current experimental AAA models involve induction of intraluminal dilation (nondissecting AAAs) or a contained intramural rupture (dissecting models). Although the ideal model should reproduce the histological characteristics and natural history of the human disease, none of the currently available animal models perfectly do so. Experimental models try to represent the main pathophysiological determinants of AAAs: genetic or acquired defects in extracellular matrix, loss of vascular smooth muscle cells, and innate or adaptive immune response. Nevertheless, most models are characterized by aneurysmal stabilization and healing after a few weeks because of cessation of the initial stimulus. Recent studies have focused on ways to optimize existing models to allow continuous aneurysmal growth. This review aims to discuss the relevance and recent advances of current animal AAA models.
Visual Overview—
An online visual overview is available for this article.
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Affiliation(s)
- Jean Sénémaud
- From the UMR 1148, Inserm-Paris7 - Denis Diderot University, Xavier Bichat Hospital, Paris, France (J.S., G.C., H.E., S.D., J.-B.M., R.C.); UMR 1173, Inserm-Paris11 - Faculty of Health Sciences Simone Veil, Versailles Saint-Quentin-en-Yvelines University, Paris-Saclay University, Montigny-le-Bretonneux, France (R.C.); Department of Vascular Surgery, Ambroise Paré University Hospital, AP-HP, Boulogne-Billancourt, France (R.C.); and UMR 1018, Inserm-Paris11 - CESP, Versailles Saint-Quentin-en-Yvelines
| | - Giuseppina Caligiuri
- From the UMR 1148, Inserm-Paris7 - Denis Diderot University, Xavier Bichat Hospital, Paris, France (J.S., G.C., H.E., S.D., J.-B.M., R.C.); UMR 1173, Inserm-Paris11 - Faculty of Health Sciences Simone Veil, Versailles Saint-Quentin-en-Yvelines University, Paris-Saclay University, Montigny-le-Bretonneux, France (R.C.); Department of Vascular Surgery, Ambroise Paré University Hospital, AP-HP, Boulogne-Billancourt, France (R.C.); and UMR 1018, Inserm-Paris11 - CESP, Versailles Saint-Quentin-en-Yvelines
| | - Harry Etienne
- From the UMR 1148, Inserm-Paris7 - Denis Diderot University, Xavier Bichat Hospital, Paris, France (J.S., G.C., H.E., S.D., J.-B.M., R.C.); UMR 1173, Inserm-Paris11 - Faculty of Health Sciences Simone Veil, Versailles Saint-Quentin-en-Yvelines University, Paris-Saclay University, Montigny-le-Bretonneux, France (R.C.); Department of Vascular Surgery, Ambroise Paré University Hospital, AP-HP, Boulogne-Billancourt, France (R.C.); and UMR 1018, Inserm-Paris11 - CESP, Versailles Saint-Quentin-en-Yvelines
| | - Sandrine Delbosc
- From the UMR 1148, Inserm-Paris7 - Denis Diderot University, Xavier Bichat Hospital, Paris, France (J.S., G.C., H.E., S.D., J.-B.M., R.C.); UMR 1173, Inserm-Paris11 - Faculty of Health Sciences Simone Veil, Versailles Saint-Quentin-en-Yvelines University, Paris-Saclay University, Montigny-le-Bretonneux, France (R.C.); Department of Vascular Surgery, Ambroise Paré University Hospital, AP-HP, Boulogne-Billancourt, France (R.C.); and UMR 1018, Inserm-Paris11 - CESP, Versailles Saint-Quentin-en-Yvelines
| | - Jean-Baptiste Michel
- From the UMR 1148, Inserm-Paris7 - Denis Diderot University, Xavier Bichat Hospital, Paris, France (J.S., G.C., H.E., S.D., J.-B.M., R.C.); UMR 1173, Inserm-Paris11 - Faculty of Health Sciences Simone Veil, Versailles Saint-Quentin-en-Yvelines University, Paris-Saclay University, Montigny-le-Bretonneux, France (R.C.); Department of Vascular Surgery, Ambroise Paré University Hospital, AP-HP, Boulogne-Billancourt, France (R.C.); and UMR 1018, Inserm-Paris11 - CESP, Versailles Saint-Quentin-en-Yvelines
| | - Raphaël Coscas
- From the UMR 1148, Inserm-Paris7 - Denis Diderot University, Xavier Bichat Hospital, Paris, France (J.S., G.C., H.E., S.D., J.-B.M., R.C.); UMR 1173, Inserm-Paris11 - Faculty of Health Sciences Simone Veil, Versailles Saint-Quentin-en-Yvelines University, Paris-Saclay University, Montigny-le-Bretonneux, France (R.C.); Department of Vascular Surgery, Ambroise Paré University Hospital, AP-HP, Boulogne-Billancourt, France (R.C.); and UMR 1018, Inserm-Paris11 - CESP, Versailles Saint-Quentin-en-Yvelines
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Pancheri FQ, Peattie RA, Reddy ND, Ahamed T, Lin W, Ouellette TD, Iafrati MD, Luis Dorfmann A. Histology and Biaxial Mechanical Behavior of Abdominal Aortic Aneurysm Tissue Samples. J Biomech Eng 2017; 139:2588203. [DOI: 10.1115/1.4035261] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Indexed: 12/20/2022]
Abstract
Abdominal aortic aneurysms (AAAs) represent permanent, localized dilations of the abdominal aorta that can be life-threatening if progressing to rupture. Evaluation of risk of rupture depends on understanding the mechanical behavior of patient AAA walls. In this project, a series of patient AAA wall tissue samples have been evaluated through a combined anamnestic, mechanical, and histopathologic approach. Mechanical properties of the samples have been characterized using a novel, strain-controlled, planar biaxial testing protocol emulating the in vivo deformation of the aorta. Histologically, the tissue ultrastructure was highly disrupted. All samples showed pronounced mechanical stiffening with stretch and were notably anisotropic, with greater stiffness in the circumferential than the axial direction. However, there were significant intrapatient variations in wall stiffness and stress. In biaxial tests in which the longitudinal stretch was held constant at 1.1 as the circumferential stretch was extended to 1.1, the maximum average circumferential stress was 330 ± 70 kPa, while the maximum average axial stress was 190 ± 30 kPa. A constitutive model considering the wall as anisotropic with two preferred directions fit the measured data well. No statistically significant differences in tissue mechanical properties were found based on patient gender, age, maximum bulge diameter, height, weight, body mass index, or smoking history. Although a larger patient cohort is merited to confirm these conclusions, the project provides new insight into the relationships between patient natural history, histopathology, and mechanical behavior that may be useful in the development of accurate methods for rupture risk evaluation.
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Affiliation(s)
| | - Robert A. Peattie
- Department of Surgery, Tufts Medical Center, Boston, MA 02111 e-mail:
| | - Nithin D. Reddy
- Department of Surgery, Tufts Medical Center, Boston, MA 02111
| | - Touhid Ahamed
- Department of Civil and Environmental Engineering, Tufts University, Medford, MA 02155
| | - Wenjian Lin
- Department of Civil and Environmental Engineering, Tufts University, Medford, MA 02155
| | | | - Mark D. Iafrati
- Department of Surgery, Tufts Medical Center, Boston, MA 02111
| | - A. Luis Dorfmann
- Department of Civil and Environmental Engineering, Tufts University, Medford, MA 02155; Department of Biomedical Engineering, Tufts University, Medford, MA 02155
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Samy AK, Finlay F, MacBain G. Elastase and Collagenase Activities in the Wall of the Abdominal Aortic Aneurysm. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/153857449402800502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Some patients with arteriosclerosis of the abdominal aorta develop occlusive lesions (group O) while others develop aneurysmal dilatation (group A). Defects in the tissue organization, possibly secondary to a familial factor, are demonstrated by enzyme imbalance in the aortic wall. The authors report their own experience in comparing elastase and collagenase activ ities between the two groups. Tissue from the aortic wall of 24 consecutive patients undergoing surgery for either aneurysmal (8 patients) or occlusive aortic disease (16 patients) was subjected to suitable biochemical assays. Four samples from group O were excluded because of low tissue weight and/or zero protein content. Aortic wall elastase was found to be significantly higher in group A than in group O. When expressed in nmol/gram tissue, the median elastase content in group A was 8.211 (range: 3.4078-14.2049) compared with 3.049 (range: 0-5.6359 of group O (P = 0.0030). This difference was still significant if it was expressed in nmol/gram protein, the comparable figures being 2.303 (range: 0.616-5.171) and 0.559 (0-1.345) respectively (P = 0.0018). On the other hand the authors were unable to confirm previous findings suggesting a variation in collagenase levels between the two groups either by using additive substrate (P = 0.3348) or by using endogenous substrate (P = 0.2170). This suggest that collagenase may not be implicated in the development of aneurysmal dilatation. Alternatively it may be tightly bound or inhibited in the aortic tissue protein matrix in such a way as to make measurement of its activity difficult, while still contributing to the pathological process. More refined techniques of detecting colla genase may therefore be required.
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Affiliation(s)
- Ahmed K. Samy
- Department of Surgery Garrick Hospital Edinburgh Road Stranraer Wigtownshire, DG9 7HQ, Scotland
| | - Frank Finlay
- Department of Surgery Garrick Hospital Edinburgh Road Stranraer Wigtownshire, DG9 7HQ, Scotland
| | - Gordon MacBain
- Department of Surgery Garrick Hospital Edinburgh Road Stranraer Wigtownshire, DG9 7HQ, Scotland
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Lehnert B, Wadouh F, Dwenger A. Aortic Enzyme Activity in Symptomatic and Asymptomatic Atherosclerotic Aneurysms. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/153857449102500805] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In the present study, the role of advanced atherosclerosis in increased aortic protease content was evaluated. Forty samples of normal and atherosclerotic aortas and of infrarenal aneurysms were assayed for collagenase and elastase. Both enzymes proved to have similar activity in normal and atherosclerotic tissue, whereas aneurysms revealed significantly elevated protease content. Preoperative symptoms increased the elastase activity: 6.58 ± 1.58 mU/g were extracted from symptomatic aneurysms in comparison with 2.51 ± 0.57 mU/g from asymptomatic aneurysms. Showed a high correlation (r = 0.96; p<0.01) with the erythrocyte sedimentation rate (ESR) preoperatively. The data suggest that advanced atherosclerosis in aneurysm samples does not enhance the proteolysis of the aortic wall. Thus, the greater protease amount found in infrarenal aortic specimens may be linked to a more rapid fiber metabolism as compared with the thoracic aorta. High elastase content, detect ed in symptomatic infrarenal aneurysms, seems to be correlated with accelerat ed ESR.
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Affiliation(s)
- Bernd Lehnert
- Hannover Medical School, Surgical Center, Division of Thoracic and Cardiovascular Surgery
| | | | - Alexander Dwenger
- Hannover Medical School, Department of Clinical Biochemistry, Hannover, Germany
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Prevention of abdominal aortic aneurysm progression by oral administration of green tea polyphenol in a rat model. J Vasc Surg 2016; 65:1803-1812.e2. [PMID: 27473778 DOI: 10.1016/j.jvs.2016.06.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 06/05/2016] [Indexed: 01/23/2023]
Abstract
OBJECTIVE Inflammation-mediated elastin destruction in the aortic medial layer is related to progression of abdominal aortic aneurysm (AAA). Epigallocatechin-3-gallate (EGCG), a major component of green tea polyphenols, reportedly increases elastin synthesis in vitro and may possess anti-inflammatory effects. We used a rat model to investigate whether EGCG could prevent AAA progression. METHODS AAA was induced with administration of intraluminal elastase and extraluminal CaCl2 in male rats. Rats were randomly divided into a control group (n = 30) and an EGCG group (n = 30). In the EGCG group, an EGCG solution (20 mg/d) was administered orally to each rat from 2 weeks before AAA induction and continued 4 weeks beyond induction. RESULTS The abdominal aortic diameter was significantly smaller in the EGCG group than in the control group on day 28 (2.9 ± 0.2 vs 2.3 ± 0.1 mm; P < .0001). The medial layer wall thickness and elastin content were significantly greater in the EGCG group than in the control group on day 28 (68.4 ± 13.6 vs 46.7 ± 13.4 μm [P < .001] and 20.3 ± 4.6 vs 9.5 ± 3.6% [P < .0001], respectively). Gene expression levels of tropoelastin and lysyl oxidase were significantly higher in the EGCG group immediately before AAA induction, indicating promoted elastoregeneration by EGCG administration (tropoelastin: 0.59 ± 0.36 control vs 1.24 ± 0.36 EGCG [P < .05], lysyl oxidase: 0.77 ± 0.45 control vs 1.34 ± 0.4 EGCG [P < .05]) (fold increase). Gene expression levels of inflammatory cytokines, including tumor necrosis factor-α and interleukin-1β, were significantly downregulated in the EGCG group (1.82 ± 0.71 vs 0.97 ± 0.59 [P < .05] and 3.91 ± 3.24 vs 0.89 ± 0.59 [P < .05], respectively). On day 7, gene expression levels and gelatinolytic activity of matrix metalloproteinase 9 were significantly lower in the EGCG group (1.41 ± 0.86 vs 0.51 ± 0.42 [P < .05] and 1.00 ± 0.17 vs 0.29 ± 0.12 [P < .0001], respectively), whereas gene expression levels of tissue inhibitors of metalloproteinase-1 were significantly higher in the EGCG group (0.96 ± 0.11 vs 1.14 ± 0.09; P < .05). CONCLUSIONS EGCG attenuated AAA progression in a rat model by preserving the aortic thickness and elastin content of the medial layer through regeneration of elastin, as mediated by anti-inflammatory effects, and subsequent reduction of matrix metalloproteinase activity.
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Martufi G, Lindquist Liljeqvist M, Sakalihasan N, Panuccio G, Hultgren R, Roy J, Gasser TC. Local Diameter, Wall Stress, and Thrombus Thickness Influence the Local Growth of Abdominal Aortic Aneurysms. J Endovasc Ther 2016; 23:957-966. [DOI: 10.1177/1526602816657086] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Purpose: To investigate the influence of the local diameter, the intraluminal thrombus (ILT) thickness, and wall stress on the local growth rate of abdominal aortic aneurysms. Methods: The infrarenal aortas of 90 asymptomatic abdominal aortic aneurysm (AAA) patients (mean age 70 years; 77 men) were retrospectively reconstructed from at least 2 computed tomography angiography scans (median follow-up of 1 year) and biomechanically analyzed with the finite element method. Each individual AAA model was automatically sliced orthogonally to the lumen centerline and represented by 100 cross sections with corresponding diameters, ILT thicknesses, and wall stresses. The data were grouped according to these parameters for comparison of differences among the variables. Results: Diameter growth was continuously distributed over the entire aneurysm sac, reaching absolute and relative median peaks of 3.06 mm/y and 7.3%/y, respectively. The local growth rate was dependent on the local baseline diameter, the local ILT thickness, and for wall segments not covered by ILT, also on the local wall stress level (all p<0.001). For wall segments that were covered by a thick ILT layer, wall stress did not affect the growth rate (p=0.08). Conclusion: Diameter is not only a strong global predictor but also a local predictor of aneurysm growth. In addition, and independent of the diameter, the ILT thickness and wall stress (for the ILT-free wall) also influence the local growth rate. The high stress sensitivity of nondilated aortic walls suggests that wall stress peaks could initiate AAA formation. In contrast, local diameters and ILT thicknesses determine AAA growth for dilated and ILT-covered aortic walls.
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Affiliation(s)
- Giampaolo Martufi
- Department of Civil Engineering, University of Calgary, Alberta, Canada
- Department of Solid Mechanics, Royal Institute of Technology, Stockholm, Sweden
| | | | - Natzi Sakalihasan
- Department of Cardiovascular Surgery, University Hospital of Liege, Belgium
| | - Giuseppe Panuccio
- Division of Vascular and Endovascular Surgery, University of Perugia, Hospital S. M. Misericordia, Perugia, Italy
- Clinic for Vascular and Endovascular Surgery, Münster University Hospital, Münster, Germany
| | - Rebecka Hultgren
- Department of Vascular Surgery, Karolinska University Hospital, Stockholm, Sweden
| | - Joy Roy
- Department of Vascular Surgery, Karolinska University Hospital, Stockholm, Sweden
| | - T. Christian Gasser
- Department of Solid Mechanics, Royal Institute of Technology, Stockholm, Sweden
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Ding R, McGuinness CL, Burnand KG, Sullivan E, Smith A. Matrix Metalloproteinases in the Aneurysm Wall of Patients Treated with Low-Dose Doxycycline. Vascular 2016; 13:290-7. [PMID: 16288704 DOI: 10.1258/rsmvasc.13.5.290] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The purpose of this study was to determine the effect of low-dose doxycycline on matrix metalloproteinase (MMP) and tissue inhibitor of metalloproteinase (TIMP)-1 expression in the wall of abdominal aortic aneurysms. A double-blind, randomized study was conducted of patients treated with doxycycline (100 mg/d orally) or placebo for 1 month prior to surgery. MMP-2, -3, and -9 (zymogen and activity); MMP-1, -2, -3, -7, -9, -11, -12, and -14; and TIMP-1 (messenger ribonucleic acid [mRNA]) were measured in the aneurysm wall. No differences were found between the treatment and placebo groups in zymogen levels of MMP-2, -3, or -9 or in the free or total activities of MMP-2 and -9. Treatment with doxycycline also had no effect on the concentration of any mRNA measured. No relationship was found between the number of tablets taken and MMP or TIMP protein, mRNA, or activity levels in the aneurysm wall. Low-dose doxycycline treatment does not alter the expression or activity of metalloproteinases or their inhibitor, TIMP-1, in the aneurysm wall.
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Affiliation(s)
- Ren Ding
- Academic Department of Surgery, King's College, St Thomas' Campus, London, UK
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Carrell TWG, Burnand KG, Booth NA, Humphries J, Smith A. Intraluminal Thrombus Enhances Proteolysis in Abdominal Aortic Aneurysms. Vascular 2016; 14:9-16. [PMID: 16849017 DOI: 10.2310/6670.2006.00008] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This study examined whether intraluminal thrombus in abdominal aortic aneurysms (AAAs) is a source of fibrinolytic activity and proteolysis that could weaken the aneurysm wall. Plasmin, tissue plasminogen activator (tPA), and urokinase plasminogen activator (uPA) activity, plasminogen activator inhibitor 1 (PAI-1), and α2-antiplasmin (α2AP) antigen were measured in the AAA wall and juxtamural and luminal aspects of intraluminal thrombus in 18 patients. The aneurysm wall contained 100-fold higher tPA activity (1.06 ± 0.34 [standard error of measurement] U/mg soluble protein) compared with juxtamural thrombus (JMT) (0.011 ± 0.001 ) and luminal thrombus (LT) (0.01 ± 0.001) ( p < .00001) and over 6-fold higher uPA activity (29.3 ± 3.4 IU/mg compared with the JMT (4.3 ± 2.4, p = .00024) and LT (7.9 ± 1.76, p = .0005). The LT had significantly lower levels of PAI-1 (1.26 ± 0.34 ng/mg) than the AAA wall (2.08 ± 0.51, p = .04) and the JMT (3.94 ± 0.85, p = .007). The levels of α2AP in the wall (19.4 ± 3.1 ng/mg) were lower than in the JMT or LT (43.0 ± 7.9 ng/mg, p = .013, and 47.6 ± 6.0 ng/mg, p = .002, respectively). There was no significant difference, however, in plasmin activity among the AAA wall, JMT, and LT. There were significant amounts of latent gelatinase B (matrix metalloproteinase [MMP]-9) in the AAA, JMT, and LT. Mean levels of activated MMP-9 activity were similar in the AAA, JMT, and LT. Plasmin activation of MMPs at the interface between intraluminal thrombus and the aneurysm wall may enhance proteolysis and accelerate aneurysm expansion.
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Affiliation(s)
- Tom W G Carrell
- Academic Department of Surgery, King's College London, St Thomas' Hospital, London, United Kingdom.
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Shirasu T, Koyama H, Miura Y, Hoshina K, Kataoka K, Watanabe T. Nanoparticles Effectively Target Rapamycin Delivery to Sites of Experimental Aortic Aneurysm in Rats. PLoS One 2016; 11:e0157813. [PMID: 27336852 PMCID: PMC4919101 DOI: 10.1371/journal.pone.0157813] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Accepted: 06/06/2016] [Indexed: 11/19/2022] Open
Abstract
Several drugs targeting the pathogenesis of aortic aneurysm have shown efficacy in model systems but not in clinical trials, potentially owing to the lack of targeted drug delivery. Here, we designed a novel drug delivery system using nanoparticles to target the disrupted aortic aneurysm micro-structure. We generated poly(ethylene glycol)-shelled nanoparticles incorporating rapamycin that exhibited uniform diameter and long-term stability. When injected intravenously into a rat model in which abdominal aortic aneurysm (AAA) had been induced by infusing elastase, labeled rapamycin nanoparticles specifically accumulated in the AAA. Microscopic analysis revealed that rapamycin nanoparticles were mainly distributed in the media and adventitia where the wall structures were damaged. Co-localization of rapamycin nanoparticles with macrophages was also noted. Rapamycin nanoparticles injected during the process of AAA formation evinced significant suppression of AAA formation and mural inflammation at 7 days after elastase infusion, as compared with rapamycin treatment alone. Correspondingly, the activities of matrix metalloproteinases and the expression of inflammatory cytokines were significantly suppressed by rapamycin nanoparticle treatment. Our findings suggest that the nanoparticle-based delivery system achieves specific delivery of rapamycin to the rat AAA and might contribute to establishing a drug therapy approach targeting aortic aneurysm.
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Affiliation(s)
- Takuro Shirasu
- Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Koyama
- Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Translational Research Center, The University of Tokyo Hospital, Tokyo, Japan
- Department of Vascular Surgery, Saitama Medical Center, Saitama Medical University, Saitama, Japan
- * E-mail:
| | - Yutaka Miura
- Departments of Materials Engineering and Bioengineering, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan
- Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Katsuyuki Hoshina
- Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Kazunori Kataoka
- Departments of Materials Engineering and Bioengineering, Graduate School of Engineering, The University of Tokyo, Tokyo, Japan
- Center for Disease Biology and Integrative Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Toshiaki Watanabe
- Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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Rabinovich RA, Miller BE, Wrobel K, Ranjit K, Williams MC, Drost E, Edwards LD, Lomas DA, Rennard SI, Agustí A, Tal-Singer R, Vestbo J, Wouters EFM, John M, van Beek EJR, Murchison JT, Bolton CE, MacNee W, Huang JTJ. Circulating desmosine levels do not predict emphysema progression but are associated with cardiovascular risk and mortality in COPD. Eur Respir J 2016; 47:1365-73. [PMID: 27009168 DOI: 10.1183/13993003.01824-2015] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 01/16/2016] [Indexed: 11/05/2022]
Abstract
Elastin degradation is a key feature of emphysema and may have a role in the pathogenesis of atherosclerosis associated with chronic obstructive pulmonary disease (COPD). Circulating desmosine is a specific biomarker of elastin degradation. We investigated the association between plasma desmosine (pDES) and emphysema severity/progression, coronary artery calcium score (CACS) and mortality.pDES was measured in 1177 COPD patients and 110 healthy control subjects from two independent cohorts. Emphysema was assessed on chest computed tomography scans. Aortic arterial stiffness was measured as the aortic-femoral pulse wave velocity.pDES was elevated in patients with cardiovascular disease (p<0.005) and correlated with age (rho=0.39, p<0.0005), CACS (rho=0.19, p<0.0005) modified Medical Research Council dyspnoea score (rho=0.15, p<0.0005), 6-min walking distance (rho=-0.17, p<0.0005) and body mass index, airflow obstruction, dyspnoea, exercise capacity index (rho=0.10, p<0.01), but not with emphysema, emphysema progression or forced expiratory volume in 1 s decline. pDES predicted all-cause mortality independently of several confounding factors (p<0.005). In an independent cohort of 186 patients with COPD and 110 control subjects, pDES levels were higher in COPD patients with cardiovascular disease and correlated with arterial stiffness (p<0.05).In COPD, excess elastin degradation relates to cardiovascular comorbidities, atherosclerosis, arterial stiffness, systemic inflammation and mortality, but not to emphysema or emphysema progression. pDES is a good biomarker of cardiovascular risk and mortality in COPD.
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Affiliation(s)
- Roberto A Rabinovich
- Edinburgh Lung and the Environment Group Initiative (ELEGI), Centre for Inflammation and Research, Queens' Medical Research Institute, Edinburgh, UK
| | - Bruce E Miller
- Respiratory Therapy Area Unit, GSK, King of Prussia, PA, USA
| | - Karolina Wrobel
- Medical Research Institute, School of Medicine, University of Dundee, Dundee, UK
| | - Kareshma Ranjit
- Edinburgh Lung and the Environment Group Initiative (ELEGI), Centre for Inflammation and Research, Queens' Medical Research Institute, Edinburgh, UK
| | | | - Ellen Drost
- Edinburgh Lung and the Environment Group Initiative (ELEGI), Centre for Inflammation and Research, Queens' Medical Research Institute, Edinburgh, UK
| | | | - David A Lomas
- Faculty of Medical Sciences, University College London, London, UK
| | - Stephen I Rennard
- Division of Pulmonary, Critical Care, Sleep and Allergy, University of Nebraska, Omaha, NE, USA Clinical Discovery Unit, AstraZeneca, Cambridge, UK
| | - Alvar Agustí
- Servei de Pneumologia, Thorax Institute, Hospital Clinic, IDIBAPS, Universitat de Barcelona and CIBER Enfermedades Respiratorias (CIBERES), Barcelona, Spain
| | - Ruth Tal-Singer
- Respiratory Therapy Area Unit, GSK, King of Prussia, PA, USA
| | - Jørgen Vestbo
- Centre for Respiratory Medicine and Allergy, Manchester Academic Health Science Centre, University Hospital South Manchester NHS Foundation Trust, Manchester, UK
| | - Emiel F M Wouters
- Dept of Respiratory Medicine, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Michelle John
- Nottingham Respiratory Research Unit, School of Medicine, University of Nottingham, Nottingham, UK
| | - Edwin J R van Beek
- Clinical Research Imaging Centre, Queens Medical Research Institute, Edinburgh, UK
| | | | - Charlotte E Bolton
- Nottingham Respiratory Research Unit, School of Medicine, University of Nottingham, Nottingham, UK
| | - William MacNee
- Edinburgh Lung and the Environment Group Initiative (ELEGI), Centre for Inflammation and Research, Queens' Medical Research Institute, Edinburgh, UK
| | - Jeffrey T J Huang
- Medical Research Institute, School of Medicine, University of Dundee, Dundee, UK
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Sultan S, Hynes N, Kavanagh EP, Diethrich EB. How does the multilayer flow modulator work? The science behind the technical innovation. J Endovasc Ther 2015; 21:814-21. [PMID: 25453884 DOI: 10.1583/14-4858.1] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Sherif Sultan
- 1 Western Vascular Institute and the Department of Vascular and Endovascular Surgery, University College Hospital Galway, Ireland
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Effect of glucose on the biomechanical function of arterial elastin. J Mech Behav Biomed Mater 2015; 49:244-54. [PMID: 26042769 DOI: 10.1016/j.jmbbm.2015.04.025] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 04/16/2015] [Accepted: 04/27/2015] [Indexed: 01/15/2023]
Abstract
Elastin is essential to provide elastic support for blood vessels. As a remarkably long-lived protein, elastin can suffer from cumulative effects of exposure to biochemical damages, which can greatly compromise its biomechanical properties. Non-enzymatic glycation is one of the main mechanisms of aging and its effect is magnified in diabetic patients. The purpose of this study is to investigate the effects of glucose on mechanical properties of isolated porcine aortic elastin. Elastin samples were incubated in 2 M glucose solution and were allowed to equilibrate for 4, 7, 14, 21 or 28 days at 37 °C. Equibiaxial tensile tests were performed to study the changes of elastic properties of elastin due to glycation. Significant decreases in tissue dimension were observed after 7 days glucose incubation. Elastin samples treated for 14, 21 or 28 days demonstrate a significant increase in hysteresis in the stress-stretch curves, indicating a greater energy loss due to glucose treatment. Both the longitudinal and the circumferential directions show significant increases in tangent modulus with glucose treatment, however only significant increases are observed after 7 days for the circumferential direction. An eight-chain statistical mechanics based microstructural model was used to study the hyperelastic and orthotropic behavior of the glucose-treated elastin and the material parameters were estimated using a nonlinear least squares method. Material parameters in the model were related to elastin density and fiber orientation, and, hence, the possible microstructural changes in glucose-treated elastin. Estimated material parameters show a general increasing trend in elastin density per unit volume with glucose incubation. The simulation results also indicate that more elastic fibers are aligned in the longitudinal and circumferential directions, rather than in the radial direction.
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Schräder CU, Heinz A, Majovsky P, Schmelzer CEH. Fingerprinting desmosine-containing elastin peptides. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2015; 26:762-773. [PMID: 25604393 DOI: 10.1007/s13361-014-1075-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 11/21/2014] [Accepted: 12/17/2014] [Indexed: 06/04/2023]
Abstract
Elastin is a vital protein of the extracellular matrix of jawed vertebrates and provides elasticity to numerous tissues. It is secreted in the form of its soluble precursor tropoelastin, which is subsequently cross-linked in the course of the elastic fiber assembly. The process involves the formation of the two tetrafunctional amino acids desmosine (DES) and isodesmosine (IDES), which are unique to elastin. The resulting high degree of cross-linking confers remarkable properties, including mechanical integrity, insolubility, and long-term stability to the protein. These characteristics hinder the structural elucidation of mature elastin. However, MS(2) data of linear and cross-linked peptides released by proteolysis can provide indirect insights into the structure of elastin. In this study, we performed energy-resolved collision-induced dissociation experiments of DES, IDES, their derivatives, and DES-/IDES-containing peptides to determine characteristic product ions. It was found that all investigated compounds yielded the same product ion clusters at elevated collision energies. Elemental composition determination using the exact masses of these ions revealed molecular formulas of the type CxHyN, suggesting that the pyridinium core of DES/IDES remains intact even at relatively high collision energies. The finding of these specific product ions enabled the development of a similarity-based scoring algorithm that was successfully applied on LC-MS/MS data of bovine elastin digests for the identification of DES-/IDES-cross-linked peptides. This approach facilitates the straightforward investigation of native cross-links in elastin.
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Affiliation(s)
- Christoph U Schräder
- Institute of Pharmacy, Faculty of Natural Sciences I, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
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Krishna SM, Seto SW, Jose RJ, Biros E, Moran CS, Wang Y, Clancy P, Golledge J. A peptide antagonist of thrombospondin-1 promotes abdominal aortic aneurysm progression in the angiotensin II-infused apolipoprotein-E-deficient mouse. Arterioscler Thromb Vasc Biol 2015; 35:389-98. [PMID: 25524772 DOI: 10.1161/atvbaha.114.304732] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
OBJECTIVE Interaction of the activating sequence in thrombospondin-1 (TSP-1) with the conserved sequence (leucine-serine-lysine-leucine [LSKL]) in the latency-associated peptide region of latent transforming growth factor (TGF)-β complex is important in regulating TGF-β1 activity. We aimed to assess the effect of blocking peptide LSKL on the progression of pre-established abdominal aortic aneurysm in angiotensin II-infused apolipoprotein E-deficient (ApoE(-/-)) mice. APPROACH AND RESULTS Abdominal aortic aneurysm was established in 3-month-old male ApoE(-/-) mice with subcutaneous infusion of angiotensin II for 28 days. After this, mice received LSKL peptide or control SLLK (serine-leucine-leucine-lysine) peptide (4 mg/kg) via daily intraperitoneal injection for an additional 2 weeks. Administration of LSKL peptide promoted larger suprarenal aortic diameter, as determined by ultrasound and morphometric analysis, and stimulated more severe atherosclerosis within the aortic arch. In addition, mice receiving LSKL peptide exhibited elevated circulating proinflammatory cytokine levels and greater inflammatory cells within the suprarenal aorta compared with controls. Mice receiving LSKL peptide showed low plasma TGF-β1 activity and low levels of aortic tissue phosphorylated to total Smad2/3. Aortic gene expression of TGF-β receptor 1 (TGFBRI) and receptor 2 (TGFBRII), but not TGF-β1 and thrombospondin-1, were lower in mice receiving LSKL peptide than controls. LSKL peptide administration was associated with greater aortic elastin fragmentation and lower expression and activity of the TGF-β1-target gene lysyl oxidase like 1 (LOXL1). CONCLUSIONS Attenuation of thrombospondin-1-directed activation of TGF-β1 promotes abdominal aortic aneurysm and atherosclerosis progression in the angiotensin II-infused ApoE(-/-) mouse model.
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MESH Headings
- Amino Acid Oxidoreductases/metabolism
- Angiotensin II
- Animals
- Aorta/drug effects
- Aorta/metabolism
- Aorta/pathology
- Aortic Aneurysm, Abdominal/blood
- Aortic Aneurysm, Abdominal/chemically induced
- Aortic Aneurysm, Abdominal/genetics
- Aortic Aneurysm, Abdominal/pathology
- Apolipoproteins E/deficiency
- Apolipoproteins E/genetics
- Atherosclerosis/blood
- Atherosclerosis/chemically induced
- Atherosclerosis/genetics
- Atherosclerosis/pathology
- Cytokines/blood
- Disease Models, Animal
- Disease Progression
- Elastin/metabolism
- Inflammation Mediators/blood
- Injections, Intraperitoneal
- Male
- Mice, Knockout
- Peptides/administration & dosage
- Peptides/toxicity
- Phosphorylation
- Protein Serine-Threonine Kinases/metabolism
- Receptor, Transforming Growth Factor-beta Type I
- Receptor, Transforming Growth Factor-beta Type II
- Receptors, Transforming Growth Factor beta/metabolism
- Smad2 Protein/metabolism
- Smad3 Protein/metabolism
- Thrombospondin 1/antagonists & inhibitors
- Thrombospondin 1/metabolism
- Time Factors
- Transforming Growth Factor beta1/blood
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Affiliation(s)
- Smriti M Krishna
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.)
| | - Sai Wang Seto
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.)
| | - Roby J Jose
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.)
| | - Erik Biros
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.)
| | - Corey S Moran
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.)
| | - Yutang Wang
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.)
| | - Paula Clancy
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.)
| | - Jonathan Golledge
- From the Vascular Biology Unit, Queensland Research Centre for Peripheral Vascular Disease, College of Medicine and Dentistry, James Cook University, Townsville, Queensland, Australia (S.M.K., S.W.S., R.J.J., E.B., C.S.M., Y.W., P.C., J.G.); and Department of Vascular and Endovascular Surgery, The Townsville Hospital, Townsville, Queensland, Australia (J.G.).
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Abstract
Up to half of all aortic dissections and ruptures in women younger than 40 years are associated with pregnancy. In pregnancy, women with aortic disease such as arteritis and aortitis are at significant risk of aneurysmal formation and dissection with potential for catastrophic outcomes. Pregnancy places predisposed women at an increased risk of dissection due to physiological and hormonal changes that occur, particularly those with connective tissue disorders, genetic syndromes, congenital heart disease, and other heritable and acquired conditions involving the aorta. Thus, preconception counseling and preparation are advised to determine which patients may cautiously pursue pregnancy, to optimize medical management prior to conception (antihypertensive medications and anticoagulants in the setting of mechanical valves), to identify women in whom aortic root repair should occur prior to pregnancy, and lastly, those in whom pregnancy is contraindicated. Additionally, discussion of the heritable nature of many aortic conditions and associated syndromes is indicated. Preconception and genetic counseling, management by a multidisciplinary team, along with close echocardiographic surveillance and medical management, are recommended if precursors of dissection are identified.
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Affiliation(s)
- Dorothy A Smok
- Division of Maternal Fetal Medicine, Department of Obstetrics and Gynecology, Columbia University Medical Center, 622 West 168th St, PH-16, New York, NY 10032.
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Cheheltani R, McGoverin CM, Rao J, Vorp DA, Kiani MF, Pleshko N. Fourier transform infrared spectroscopy to quantify collagen and elastin in an in vitro model of extracellular matrix degradation in aorta. Analyst 2014; 139:3039-47. [PMID: 24761431 PMCID: PMC4096121 DOI: 10.1039/c3an02371k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Extracellular matrix (ECM) is a key component and regulator of many biological tissues including aorta. Several aortic pathologies are associated with significant changes in the composition of the matrix, especially in the content, quality and type of aortic structural proteins, collagen and elastin. The purpose of this study was to develop an infrared spectroscopic methodology that is comparable to biochemical assays to quantify collagen and elastin in aorta. Enzymatically degraded porcine aorta samples were used as a model of ECM degradation in abdominal aortic aneurysm (AAA). After enzymatic treatment, Fourier transform infrared (FTIR) spectra of the aortic tissue were acquired by an infrared fiber optic probe (IFOP) and FTIR imaging spectroscopy (FT-IRIS). Collagen and elastin content were quantified biochemically and partial least squares (PLS) models were developed to predict collagen and elastin content in aorta based on FTIR spectra. PLS models developed from FT-IRIS spectra were able to predict elastin and collagen content of the samples with strong correlations (RMSE of validation = 8.4% and 11.1% of the range respectively), and IFOP spectra were successfully used to predict elastin content (RMSE = 11.3% of the range). The PLS regression coefficients from the FT-IRIS models were used to map collagen and elastin in tissue sections of degraded porcine aortic tissue as well as a human AAA biopsy tissue, creating a similar map of each component compared to histology. These results support further application of FTIR spectroscopic techniques for evaluation of AAA tissues.
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Affiliation(s)
- Rabee Cheheltani
- Department of Mechanical Engineering, Temple University, Philadelphia, PA 19122, USA
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Parastatidis I, Weiss D, Joseph G, Taylor WR. Overexpression of catalase in vascular smooth muscle cells prevents the formation of abdominal aortic aneurysms. Arterioscler Thromb Vasc Biol 2013; 33:2389-96. [PMID: 23950141 DOI: 10.1161/atvbaha.113.302175] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVE Elevated levels of oxidative stress have been reported in abdominal aortic aneurysms (AAA), but which reactive oxygen species promotes the development of AAA remains unclear. Here, we investigate the effect of hydrogen peroxide (H2O2)-degrading enzyme catalase on the formation of AAA. APPROACH AND RESULTS AAA were induced with the application of calcium chloride (CaCl2) on mouse infrarenal aortas. The administration of PEG-catalase, but not saline, attenuated the loss of tunica media and protected against AAA formation (0.91 ± 0.1 versus 0.76 ± 0.09 mm). Similarly, in a transgenic mouse model, catalase overexpression in the vascular smooth muscle cells preserved the thickness of tunica media and inhibited aortic dilatation by 50% (0.85 ± 0.14 versus 0.57 ± 0.08 mm). Further studies showed that injury with CaCl2 decreased catalase expression and activity in the aortic wall. Pharmacological administration or genetic overexpression of catalase restored catalase activity and subsequently decreased matrix metalloproteinase activity. In addition, a profound reduction in inflammatory markers and vascular smooth muscle cell apoptosis was evident in aortas of catalase-overexpressing mice. Interestingly, as opposed to infusion of PEG-catalase, chronic overexpression of catalase in vascular smooth muscle cells did not alter the total aortic H2O2 levels. CONCLUSIONS The data suggest that a reduction in aortic wall catalase activity can predispose to AAA formation. Restoration of catalase activity in the vascular wall enhances aortic vascular smooth muscle cell survival and prevents AAA formation primarily through modulation of matrix metalloproteinase activity.
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Affiliation(s)
- Ioannis Parastatidis
- From the Department of Medicine, Cardiology Division, Emory University School of Medicine, Atlanta, GA (I.P., D.W., G.J., W.R.T.); Cardiology Division, Atlanta Veterans Affairs Medical Center, Atlanta, GA (W.R.T.); and Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA (W.R.T.)
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50
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Tsamis A, Krawiec JT, Vorp DA. Elastin and collagen fibre microstructure of the human aorta in ageing and disease: a review. J R Soc Interface 2013; 10:20121004. [PMID: 23536538 PMCID: PMC3645409 DOI: 10.1098/rsif.2012.1004] [Citation(s) in RCA: 292] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Accepted: 03/06/2013] [Indexed: 12/28/2022] Open
Abstract
Aortic disease is a significant cause of death in developed countries. The most common forms of aortic disease are aneurysm, dissection, atherosclerotic occlusion and ageing-induced stiffening. The microstructure of the aortic tissue has been studied with great interest, because alteration of the quantity and/or architecture of the connective fibres (elastin and collagen) within the aortic wall, which directly imparts elasticity and strength, can lead to the mechanical and functional changes associated with these conditions. This review article summarizes the state of the art with respect to characterization of connective fibre microstructure in the wall of the human aorta in ageing and disease, with emphasis on the ascending thoracic aorta and abdominal aorta where the most common forms of aortic disease tend to occur.
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Affiliation(s)
- Alkiviadis Tsamis
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Vascular Remodeling and Regeneration, University of Pittsburgh, Pittsburgh, PA, USA
- Vascular Bioengineering Laboratory, 300 Center for Bioengineering, 300 Technology Drive, Pittsburgh, PA 15213, USA
| | - Jeffrey T. Krawiec
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Vascular Remodeling and Regeneration, University of Pittsburgh, Pittsburgh, PA, USA
- Vascular Bioengineering Laboratory, 300 Center for Bioengineering, 300 Technology Drive, Pittsburgh, PA 15213, USA
| | - David A. Vorp
- Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Cardiothoracic Surgery, University of Pittsburgh, Pittsburgh, PA, USA
- Department of Surgery, University of Pittsburgh, Pittsburgh, PA, USA
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, PA, USA
- Center for Vascular Remodeling and Regeneration, University of Pittsburgh, Pittsburgh, PA, USA
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