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de Paula VF, Tardelli LP, Amaral SL. Dexamethasone-Induced Arterial Stiffening Is Attenuated by Training due to a Better Balance Between Aortic Collagen and Elastin Levels. Cardiovasc Drugs Ther 2024; 38:693-703. [PMID: 36795192 DOI: 10.1007/s10557-023-07438-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 02/02/2023] [Indexed: 02/17/2023]
Abstract
PURPOSE Although the cardioprotective benefits of exercise training are well known, the effects of training on dexamethasone (DEX)-induced arterial stiffness are still unclear. This study was aimed at investigating the mechanisms induced by training to prevent DEX-induced arterial stiffness. METHODS Wistar rats were allocated into 4 groups and submitted to combined training (aerobic and resistance exercises, on alternate days, 60% of maximal capacity, for 74 d) or were kept sedentary: sedentary control rats (SC), DEX-treated sedentary rats (DS), combined training control (CT), and DEX-treated trained rats (DT). During the last 14 d, rats were treated with DEX (50 μg/kg per body weight, per day, s.c.) or saline. RESULTS DEX increased PWV (+44% vs +5% m/s, for DS vs SC, p<0.001) and increased aortic COL 3 protein level (+75%) in DS. In addition, PWV was correlated with COL3 levels (r=0.682, p<0.0001). Aortic elastin and COL1 protein levels remained unchanged. On the other hand, the trained and treated groups showed lower PWV values (-27% m/s, p<0.001) vs DS and lower values of aortic and femoral COL3 compared with DS. CONCLUSION As DEX is widely used in several situations, the clinical relevance of this study is that the maintenance of good physical capacity throughout life can be crucial to alleviate some of its side effects, such as arterial stiffness.
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Affiliation(s)
- Vinicius F de Paula
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Rodovia Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil
- Department of Physical Education, São Paulo State University (UNESP), School of Sciences, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01, Bauru, SP, 17033-360, Brazil
| | - Lidieli P Tardelli
- Department of Physical Education, São Paulo State University (UNESP), School of Sciences, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01, Bauru, SP, 17033-360, Brazil
| | - Sandra L Amaral
- Joint Graduate Program in Physiological Sciences, PIPGCF UFSCar/UNESP, Rodovia Washington Luiz, km 235, São Carlos, SP, 13565-905, Brazil.
- Department of Physical Education, São Paulo State University (UNESP), School of Sciences, Av. Eng. Luiz Edmundo Carrijo Coube, 14-01, Bauru, SP, 17033-360, Brazil.
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Ma W, Liu Z, Zhu T, Wang L, Du J, Wang K, Xu C. Fabric-Enhanced Vascular Graft with Hierarchical Structure for Promoting the Regeneration of Vascular Tissue. Adv Healthc Mater 2024; 13:e2302676. [PMID: 38279911 DOI: 10.1002/adhm.202302676] [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: 08/14/2023] [Revised: 01/19/2024] [Indexed: 01/29/2024]
Abstract
Natural blood vessels have completed functions, including elasticity, compliance, and excellent antithrombotic properties because of their mature structure. To replace damaged blood vessels, vascular grafts should perform these functions by simulating the natural vascular structures. Although the structures of natural blood vessels are thoroughly explored, constructing a small-diameter vascular graft that matches the mechanical and biological properties of natural blood vessels remains a challenge. A hierarchical vascular graft is fabricated by Electrospinning, Braiding, and Thermally induced phase separation (EBT) processes, which could simulate the structure of natural blood vessels. The internal electrospun structure facilitates the adhesion of endothelial cells, thereby accelerating endothelialization. The intermediate PLGA fabric exhibits excellent mechanical properties, which allow it to maintain its shape during long-term transplantation and prevent graft expansion. The external macroporous structure is beneficial for cell growth and infiltration. Blood vessel remodeling aims to combine a structure that promotes tissue regeneration with anti-inflammatory materials. The results in vitro demonstrated that it EBT vascular graft (EBTVG) has matched the mechanical properties, reliable cytocompatibility, and the strongest endothelialization in situ. The results in vitro and replacement of the resected artery in vivo suggest that the EBTVG combines different structural advantages with biomechanical properties and reliable biocompatibility, significantly promoting the stabilization and regeneration of vascular endothelial cells and vascular smooth muscle cells, as well as stabilizing the blood microenvironment.
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Affiliation(s)
- Wenxin Ma
- Multidisciplinary Centre for Advanced Materials, School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Rd., Shanghai, 201620, P. R. China
- School of Textiles and Fashion, Shanghai University of Engineering Science, 333 Longteng Rd., Shanghai, 201620, P. R. China
| | - Zhuo Liu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Fudan University, 138 Xueyuan Rd., Shanghai, 200032, P. R. China
| | - Tonghe Zhu
- Multidisciplinary Centre for Advanced Materials, School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Rd., Shanghai, 201620, P. R. China
| | - Liming Wang
- School of Textiles and Fashion, Shanghai University of Engineering Science, 333 Longteng Rd., Shanghai, 201620, P. R. China
| | - Juan Du
- Multidisciplinary Centre for Advanced Materials, School of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, 333 Longteng Rd., Shanghai, 201620, P. R. China
| | - Kun Wang
- Department of General Surgery, The First Affiliated Hospital of Shandong First Medical University & Shandong Provincial Qianfoshan Hospital, Key Laboratory of Metabolism and Gastrointestinal Tumors, the First Affiliated Hospital of Shandong First Medical University, Key Laboratory of Laparoscopic Technology, the First Affiliated Hospital of Shandong First Medical University, Shandong Medicine and Health Key Laboratory of General Surgery, 16766 Jingshi Rd., Jinan, 250014, P. R. China
| | - Chen Xu
- Department of Physiology and Pathophysiology, School of Basic Medical Sciences, Fudan University, 138 Xueyuan Rd., Shanghai, 200032, P. R. China
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3
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Cuspidi C, Facchetti R, Bombelli M, Seravalle G, Grassi G, Mancia G. New-onset aortic dilatation in the population: a quarter-century follow-up. Clin Res Cardiol 2023; 112:1529-1540. [PMID: 36028778 PMCID: PMC10584747 DOI: 10.1007/s00392-022-02086-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Accepted: 08/16/2022] [Indexed: 11/24/2022]
Abstract
BACKGROUND Aortic size tends to increase with aging but the extent of this dynamic process has not been evaluated in long-term longitudinal population-based studies. We investigated the incidence of new-onset aortic root (AR) dilatation and its principal correlates among middle-aged adults over a 25-year time period. METHODS A total of 471 participants with measurable echocardiographic parameters at baseline and after a 25-year follow-up were included in the analysis. Sex-specific upper limits of normality for absolute AR diameter, AR diameter indexed to body surface area (BSA) and to height were derived from healthy normotensive PAMELA participants. RESULTS New AR dilatation occurred in 7.4% (AR/BSA), 9.1% (AR/height) and 14.6% (absolute AR), respectively. According to the AR/height index, the risk of new dilation was similar in men and women. As for echocardiographic parameters, baseline AR diameter emerged as a key predictor of AR dilation, regardless of the diagnostic criteria and the 10-year change in LVMI was positively associated to new AR/height dilatation. No significant relationship was observed between baseline office and ambulatory systolic/diastolic blood pressure or their changes over time with incident AR dilatation. Baseline and the 25-year change in 24-h pulse pressure were negatively related to new AR dilatation. CONCLUSIONS The incidence of AR dilatation from mid to late adulthood occurs in a small but clinically relevant fraction of participants and is unaffected by both office and out-office BP. It is significant related to baseline AR diameter and to the 25-year change in LVMI. Our data suggest that echocardiography performed in middle-aged individuals of both sexes may identify those at increased risk of future AR dilatation; moreover, preventing LVH may reduce the risk of progressive AR enlargement.
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Affiliation(s)
- Cesare Cuspidi
- Department of Medicine and Surgery, University of Milano-Bicocca and University Milano-Bicocca Milano, Milan, Italy.
| | - Rita Facchetti
- Department of Medicine and Surgery, University of Milano-Bicocca and University Milano-Bicocca Milano, Milan, Italy
| | - Michele Bombelli
- Department of Medicine and Surgery, University of Milano-Bicocca and University Milano-Bicocca Milano, Milan, Italy
| | | | - Guido Grassi
- Department of Medicine and Surgery, University of Milano-Bicocca and University Milano-Bicocca Milano, Milan, Italy
| | - Giuseppe Mancia
- Department of Medicine and Surgery, University of Milano-Bicocca and University Milano-Bicocca Milano, Milan, Italy
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Longtine AG, Venkatasubramanian R, Zigler MC, Lindquist AJ, Mahoney SA, Greenberg NT, VanDongen NS, Ludwig KR, Moreau KL, Seals DR, Clayton ZS. Female C57BL/6N mice are a viable model of aortic aging in women. Am J Physiol Heart Circ Physiol 2023; 324:H893-H904. [PMID: 37115626 PMCID: PMC10202480 DOI: 10.1152/ajpheart.00120.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 04/20/2023] [Accepted: 04/21/2023] [Indexed: 04/29/2023]
Abstract
The aorta stiffens with aging in both men and women, which predicts cardiovascular mortality. Aortic wall structural and extracellular matrix (ECM) remodeling, induced in part by chronic low-grade inflammation, contribute to aortic stiffening. Male mice are an established model of aortic aging. However, there is little information regarding whether female mice are an appropriate model of aortic aging in women, which we aimed to elucidate in the present study. We assessed two strains of mice and found that in C57BL/6N mice, in vivo aortic stiffness (pulse wave velocity, PWV) was higher with aging in both sexes, whereas in B6D2F1 mice, PWV was higher in old versus young male mice, but not in old versus young female mice. Because the age-related stiffening that occurs in men and women was reflected in male and female C57BL/6N mice, we examined the mechanisms of stiffening in this strain. In both sexes, aortic modulus of elasticity (pin myography) was lower in old mice, occurred in conjunction with and was related to higher plasma levels of the elastin-degrading enzyme matrix metalloproteinase-9 (MMP-9), and was accompanied by higher numbers of aortic elastin breaks and higher abundance of adventitial collagen-1. Plasma levels of the inflammatory cytokines interferon-γ, interleukin 6, and monocyte chemoattractant protein-1 were higher in both sexes of old mice. In conclusion, female C57BL/6N mice exhibit aortic stiffening, reduced modulus of elasticity and structural/ECM remodeling, and associated increases in MMP-9 and systemic inflammation with aging, and thus are an appropriate model of aortic aging in women.NEW & NOTEWORTHY Our study demonstrates that with aging, female C57BL/6N mice exhibit higher in vivo aortic stiffness, reduced modulus of elasticity, aortic wall structural and extracellular matrix remodeling, and elevations in systemic inflammation. These changes are largely reflective of those that occur with aging in women. Thus, female C57BL/6N mice are a viable model of human aortic aging and the utility of these animals should be considered in future biomedical investigations.
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Affiliation(s)
- Abigail G Longtine
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | | | - Melanie C Zigler
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Alexandra J Lindquist
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Sophia A Mahoney
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Nathan T Greenberg
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Nicholas S VanDongen
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Katelyn R Ludwig
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Kerrie L Moreau
- University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States
| | - Douglas R Seals
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
| | - Zachary S Clayton
- Department of Integrative Physiology, University of Colorado Boulder, Boulder, Colorado, United States
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5
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Ryffel CP, Eser P, Marcin T, Herrsche D, Brugger N, Trachsel LD, Wilhelm M. Young endurance training starting age in non-elite athletes is associated with higher proximal aortic distensibility. Open Heart 2022; 9:openhrt-2021-001771. [PMID: 35264414 PMCID: PMC8915284 DOI: 10.1136/openhrt-2021-001771] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 01/09/2022] [Indexed: 12/15/2022] Open
Abstract
Objective Decreased proximal aortic distensibility (AD) is known to significantly predict all-cause mortality and cardiovascular events among individuals without overt cardiovascular disease. This cross-sectional study investigated the association of endurance training (ET) parameters, namely, ET starting age, ET years and yearly ET volume with AD in non-elite endurance athletes. Methods Healthy, normotensive, male Caucasian participants of a 10-mile race were assessed with a 2D echocardiogram and comprehensive interview. Ascending aortic diameters were measured simultaneously with pulse pressure. Aortic strain, AD and aortic stiffness index were calculated. Predictors of AD were investigated among training parameters by linear regression models corrected for age, resting heart rate, stroke volume index and mean blood pressure. Results Ninety-two of 121 athletes (aged 42±8 years) had sufficient echocardiogram quality and were used for analysis. ET starting age (range 6–52 years) and years of ET (range 2–46 years) were highly collinear and used in two separate models for AD. Significant factors for AD were ET starting age, 10-mile race time and resting heart rate in model I, and age, years of ET, 10-mile race time and heart rate in model II (all p<0.01). Conclusions In our cohort of healthy, non-elite, middle-aged runners, AD was significantly higher in athletes with younger ET starting age or more years of ET (in the model adjusted for confounders). In the model with years of ET, age had a negative contribution to AD, suggesting that with older age, the benefit of more years of ET on AD decreased. Future studies assessing the effect of exercise training on arterial properties should include training starting age.
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Affiliation(s)
- Christoph P Ryffel
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Prisca Eser
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Thimo Marcin
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Dario Herrsche
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.,Exercise Physiology Lab, Institute of Human Movement Sciences and Sport, ETH Zurich, Zurich, Switzerland
| | - Nicolas Brugger
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Lukas D Trachsel
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Matthias Wilhelm
- Department of Cardiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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6
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Logvinov SV, Naryzhnaya NV, Kurbatov BK, Gorbunov AS, Birulina YG, Maslov LL, Oeltgen PR. High carbohydrate high fat diet causes arterial hypertension and histological changes in the aortic wall in aged rats: The involvement of connective tissue growth factors and fibronectin. Exp Gerontol 2021; 154:111543. [PMID: 34455071 DOI: 10.1016/j.exger.2021.111543] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 08/23/2021] [Accepted: 08/23/2021] [Indexed: 10/20/2022]
Abstract
BACKGROUND Age and diabetes are risk factors for arterial hypertension. However, the relationship between age, connective tissue growth factors, vascular aging and arterial hypertension while on a the high-carbohydrate high-fat diet (HCHFD) remains poorly understood. PURPOSE To estimate the relationship between humoral factors, the morphological changes of aorta and impaired blood pressure regulation under the influence of age and a HCHFD. METHODS A study was carried out in male Wistar rats, which were divided into the following groups: 1st (n = 15) - naive young rats; 2nd (n = 15) - young rats, exposed to HCHFD; 3rd (n = 14) - naive old rats; 4th (n = 12) - old rats exposed to HCHFD. The age of old rats was 540 days, and young rats 150 days at the end of the diet. HCHFD contained proteins 16%, fats 21%, carbohydrates 46%, including 17% fructose, 0.125% cholesterol, 90 days. Blood pressure and body weight were measured weekly, carbohydrate metabolism, histological signs of changes in the aorta, serum transforming growth factor-β (TGF-β), connective tissue growth factor (CTGF), fibronectin, and endothelin-1 levels were determined one week after the onset of diet. RESULTS The severity of arterial hypertension and its histological signs in the aortic wall was found to be most pronounced in elderly rats kept on a HCHFD. In young rats kept on a HCHFD, arterial hypertension was transient. An increase in systolic blood pressure has a positive correlation with the degree of obesity, serum fibronectin, and endothelin-1 content, and impaired carbohydrate metabolism. The rise in diastolic blood pressure has a positive correlation with the serum CTGF, endothelin-1, fibronectin levels and aortic wall thickness, and impaired carbohydrate metabolism. A rise in the serum concentration of fibronectin was also associated with increased endothelin-1, TGFβ and CTGF serum levels. CONCLUSION This study indicated that an increase in blood pressure in old rats with a high-carbohydrate high-fat diet is due to a disturbance of a structure of the vascular wall, the release of fibronectin, which can occur under the influence of carbohydrate metabolism disorders, endothelin-1, TGFβ and CTGF.
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Affiliation(s)
- Sergey V Logvinov
- Cardiology Research Institute, Tomsk National Research Medical Center, The Russian Academy of Sciences, 634012 Tomsk, Russia; Siberian State Medical University, Tomsk, Russia
| | - Natalia V Naryzhnaya
- Cardiology Research Institute, Tomsk National Research Medical Center, The Russian Academy of Sciences, 634012 Tomsk, Russia.
| | - Boris K Kurbatov
- Cardiology Research Institute, Tomsk National Research Medical Center, The Russian Academy of Sciences, 634012 Tomsk, Russia
| | - Alexander S Gorbunov
- Cardiology Research Institute, Tomsk National Research Medical Center, The Russian Academy of Sciences, 634012 Tomsk, Russia
| | | | - Leonid L Maslov
- Cardiology Research Institute, Tomsk National Research Medical Center, The Russian Academy of Sciences, 634012 Tomsk, Russia
| | - Peter R Oeltgen
- Department of Pathology, University of Kentucky College of Medicine, Lexington, KY, USA
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GRAMIGNA VERA, FRAGOMENI GIONATA, FONTANELLA CHIARAGIULIA, STEFANINI CESARE, CARNIEL EMANUELELUIGI. A COUPLED EXPERIMENTAL AND NUMERICAL APPROACH TO CHARACTERIZE THE ANISOTROPIC MECHANICAL BEHAVIOR OF AORTIC TISSUES. J MECH MED BIOL 2020. [DOI: 10.1142/s021951942050027x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Nowadays, the investigation of aortic wall biomechanics is a fundamental tool in clinical research and vascular prosthesis design. This study aims at analyzing the biomechanical behavior of aortic tissues using a coupled experimental and computational approach. Considering the typical fiber-reinforced configuration of aortic tissues, uni-axial tensile tests along six different loading directions were performed on specimens from pig aorta. Starting from the obtained experimental data, a suitable constitutive framework was defined and a methodology for the identification of the constitutive parameters was developed using the inverse analysis of mechanical tests. Transversal stretch versus loading stretch and nominal stress versus loading stretch curves were evaluated, showing the anisotropic and nonlinear mechanical behavior determined by tissue conformation with fibers distributed along preferential directions. In detail, experimental data showed different mechanical responses between longitudinal and circumferential directions, with a greater tissue stiffness along the longitudinal one. The reliability of the developed constitutive framework was evaluated by the comparison between experimental data and model results. The mentioned analysis can be considered as a useful tool for the development of reliable computational models, which allow a better understanding of the pathophysiology of cardiovascular diseases and can be applied for a proper planning of surgical procedures.
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Affiliation(s)
- VERA GRAMIGNA
- Neuroscience Research Center, Magna Graecia University, Viale Europa, 88100 Catanzaro, Italy
| | - GIONATA FRAGOMENI
- Medical and Surgical Sciences, Magna Graecia University, Viale Europa, 88100 Catanzaro, Italy
| | - CHIARA GIULIA FONTANELLA
- Department of Industrial Engineering, Centre for Mechanics of Biological Materials, University of Padova, Via Venezia 1, Padova I-35131, Italy
| | - CESARE STEFANINI
- The BioRobotics Institute, Scuola Superiore Sant’Anna, Viale Rinaldo Piaggio 34, Pontedera (Pisa) I-56025, Italy
- Healthcare Engineering Innovation Center, Khalifa University, Abu Dhabi, UAE
| | - EMANUELE LUIGI CARNIEL
- Department of Industrial Engineering, Centre for Mechanics of Biological Materials, University of Padova, Via Venezia 1, Padova I-35131, Italy
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8
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Prata MP, Jaldin RG, Lourenção PLTDA, Sobreira ML, Yoshida RDA, Terra SA, Viero RM, Yoshida WB. Acute aortic wall injury caused by aortic cross-clamping: morphological and biomechanical study of the aorta in a swine model of three aortic surgery approaches. J Vasc Bras 2020; 19:e20190025. [PMID: 32499823 PMCID: PMC7244208 DOI: 10.1590/1677-5449.190025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Background Aortic cross-clamping and balloon occlusion of the aorta could lead to damage to the aorta wall. Objective The aim of this study was to investigate changes to the aorta wall related to the method used to interrupt flow (clamping or balloon) in the different techniques available for aortic surgery. Methods Experiments were performed on 40 female pigs, weighing 25-30kg, which were randomly allocated to 4 study groups: S (n=10), no intervention (sham group); C (n=10), midline transperitoneal laparotomy for infrarenal abdominal aortic access with 60 min of cross-clamping; L (n=10), laparoscopic infrarenal abdominal aortic surgery with 60 min of cross-clamping; EV (n=10), remote proximal aortic control with transfemoral arterial insertion of aortic occlusion balloon catheter, inflated to provide continued aortic occlusion for 60min. After euthanasia, the aortas were removed and cross-sectioned to obtain histological specimens for light microscopic and morphometric analyses. The remaining longitudinal segments were stretched to rupture and mechanical parameters were determined. Results We observed a reduction in the yield point of the abdominal aorta, decrease in stiffness and in failure load in the aortic cross-clamping groups (C and L) compared with the EV group. Conclusions Aortic cross-clamping during open or laparoscopic surgery can affect the mechanical properties of the aorta leading to decrease in resistance of the aorta wall, without structural changes in aorta wall histology.
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Affiliation(s)
- Marcela Polachini Prata
- Universidade Estadual Paulista - UNESP, Faculdade de Medicina de Botucatu, São Paulo, SP, Brasil
| | - Rodrigo Gibin Jaldin
- Universidade Estadual Paulista - UNESP, Faculdade de Medicina de Botucatu, São Paulo, SP, Brasil
| | | | - Marcone Lima Sobreira
- Universidade Estadual Paulista - UNESP, Faculdade de Medicina de Botucatu, São Paulo, SP, Brasil
| | | | - Simone Antunes Terra
- Universidade Estadual Paulista - UNESP, Faculdade de Medicina de Botucatu, São Paulo, SP, Brasil
| | - Rosa Marlene Viero
- Universidade Estadual Paulista - UNESP, Faculdade de Medicina de Botucatu, São Paulo, SP, Brasil
| | - Winston Bonetti Yoshida
- Universidade Estadual Paulista - UNESP, Faculdade de Medicina de Botucatu, São Paulo, SP, Brasil
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9
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Concannon J, Dockery P, Black A, Sultan S, Hynes N, McHugh PE, Moerman KM, McGarry JP. Quantification of the regional bioarchitecture in the human aorta. J Anat 2020; 236:142-155. [PMID: 31512228 PMCID: PMC6904601 DOI: 10.1111/joa.13076] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/26/2019] [Indexed: 12/14/2022] Open
Abstract
Regional variance in human aortic bioarchitecture responsible for the elasticity of the vessel is poorly understood. The current study quantifies the elements responsible for aortic compliance, namely, elastin, collagen and smooth muscle cells, using histological and stereological techniques on human tissue with a focus on regional heterogeneity. Using donated cadaveric tissue, a series of samples were excised between the proximal ascending aorta and the distal abdominal aorta, for five cadavers, each of which underwent various staining procedures to enhance specific constituents of the wall. Using polarised light microscopy techniques, the orientation of collagen fibres was studied for each location and each tunical layer of the aorta. Significant transmural and longitudinal heterogeneity in collagen fibre orientations were uncovered throughout the vessel. It is shown that a von Mises mixture model is required accurately to fit the complex collagen fibre distributions that exist along the aorta. Additionally, collagen and smooth muscle cell density was observed to increase with increasing distance from the heart, whereas elastin density decreased. Evidence clearly demonstrates that the aorta is a highly heterogeneous vessel which cannot be simplistically represented by a single compliance value. The quantification and fitting of the regional aortic bioarchitectural data, although not without its limitations, including mean cohort age of 77.6 years, facilitates the development of next-generation finite element models that can potentially simulate the influence of regional aortic composition and microstructure on vessel biomechanics.
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Affiliation(s)
- J. Concannon
- Biomedical EngineeringNational University of Ireland GalwayGalwayIreland
| | - P. Dockery
- Anatomy, School of MedicineNational University of Ireland GalwayGalwayIreland
| | - A. Black
- Anatomy, School of MedicineNational University of Ireland GalwayGalwayIreland
| | - S. Sultan
- Department of Vascular and Endovascular SurgeryNational University of Ireland GalwayGalwayIreland
| | - N. Hynes
- Department of Vascular and Endovascular SurgeryNational University of Ireland GalwayGalwayIreland
| | - P. E. McHugh
- Biomedical EngineeringNational University of Ireland GalwayGalwayIreland
| | - K. M. Moerman
- Biomedical EngineeringNational University of Ireland GalwayGalwayIreland
- Biomechatronics, Media LabMassachusetts Institute of TechnologyCambridgeMAUSA
| | - J. P. McGarry
- Biomedical EngineeringNational University of Ireland GalwayGalwayIreland
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10
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Fhayli W, Boëté Q, Harki O, Briançon-Marjollet A, Jacob MP, Faury G. Rise and fall of elastic fibers from development to aging. Consequences on arterial structure-function and therapeutical perspectives. Matrix Biol 2019; 84:41-56. [PMID: 31493460 DOI: 10.1016/j.matbio.2019.08.005] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 08/03/2019] [Accepted: 08/26/2019] [Indexed: 12/12/2022]
Abstract
In the arteries of vertebrates, evolution has given rise to resilient macromolecular structures, elastin and elastic fibers, capable of sustaining an elevated blood pressure and smoothening the discontinuous blood flow and pressure generated by the heart. Elastic fibers are produced only during development and childhood, before being progressively degraded by mechanical stress and enzymatic activities during adulthood and aging. During this period, arterial elastic fiber calcification and loading of lipids also occur, all of these events conducting to arteriosclerosis. This leads to a progressive dysfunction of the large elastic arteries inducing elevated blood pressure as well as altered hemodynamics and organ perfusion, which induce more global malfunctions of the body during normal aging. Additionally, some arterial conditions occur more frequently with advancing age, such as atherosclerosis or aneurysms, which are called age-related diseases or pathological aging. The physiological or pathological degradation of elastic fibers and function of elastic arteries seemed to be rather inevitable over time. However, during the recent years, different molecules - including several ATP-dependent potassium channel openers, such as minoxidil - have been shown to re-induce elastin production and elastic fiber assembly, leading to improvements in the arterial structure and function or in organ perfusion. This review summarizes the changes in the arterial elastic fibers and structure from development until aging, and presents some of the potential pharmacotherapies leading to elastic fiber neosynthesis and arterial function improvement.
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Affiliation(s)
- Wassim Fhayli
- Univ. Grenoble Alpes, Inserm U1042, CHU Grenoble Alpes, HP2, 38000 Grenoble, France
| | - Quentin Boëté
- Univ. Grenoble Alpes, Inserm U1042, CHU Grenoble Alpes, HP2, 38000 Grenoble, France
| | - Olfa Harki
- Univ. Grenoble Alpes, Inserm U1042, CHU Grenoble Alpes, HP2, 38000 Grenoble, France
| | | | - Marie-Paule Jacob
- INSERM, U1148, and Hopital Bichat-Claude Bernard, 46 rue Henri Huchard, 75877 Paris, France
| | - Gilles Faury
- Univ. Grenoble Alpes, Inserm U1042, CHU Grenoble Alpes, HP2, 38000 Grenoble, France.
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Wang M, Monticone RE, McGraw KR. Proinflammatory Arterial Stiffness Syndrome: A Signature of Large Arterial Aging. J Vasc Res 2018; 55:210-223. [PMID: 30071538 PMCID: PMC6174095 DOI: 10.1159/000490244] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 05/21/2018] [Indexed: 12/11/2022] Open
Abstract
Age-associated structural and functional remodeling of the arterial wall produces a productive environment for the initiation and progression of hypertension and atherosclerosis. Chronic aging stress induces low-grade proinflammatory signaling and causes cellular proinflammation in arterial walls, which triggers the structural phenotypic shifts characterized by endothelial dysfunction, diffuse intimal-medial thickening, and arterial stiffening. Microscopically, aged arteries exhibit an increase in arterial cell senescence, proliferation, invasion, matrix deposition, elastin fragmentation, calcification, and amyloidosis. These characteristic cellular and matrix alterations not only develop with aging but can also be induced in young animals under experimental proinflammatory stimulation. Interestingly, these changes can also be attenuated in old animals by reducing low-grade inflammatory signaling. Thus, mitigating age-associated proinflammation and arterial phenotype shifts is a potential approach to retard arterial aging and prevent the epidemic of hypertension and atherosclerosis in the elderly.
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