Biomechanics and Modeling in Mechanobiology最新文献

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Risk evaluation of adverse aortic events in patients with non-circular aortic annulus after transcatheter aortic valve implantation: a numerical study 经导管主动脉瓣植入术后非环形主动脉环患者主动脉不良事件的风险评估:一项数值研究
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-05-08 DOI: 10.1007/s10237-023-01725-2
Jun Wen, Qi Gao, Jingnan Chen, Xinya Li, Kaiyue Zhang, Gang He, Min Dai, Pan Song
{"title":"Risk evaluation of adverse aortic events in patients with non-circular aortic annulus after transcatheter aortic valve implantation: a numerical study","authors":"Jun Wen,&nbsp;Qi Gao,&nbsp;Jingnan Chen,&nbsp;Xinya Li,&nbsp;Kaiyue Zhang,&nbsp;Gang He,&nbsp;Min Dai,&nbsp;Pan Song","doi":"10.1007/s10237-023-01725-2","DOIUrl":"10.1007/s10237-023-01725-2","url":null,"abstract":"<div><p>Transcatheter aortic valve implantation (TAVI) is a micro-invasive surgery used to treat patients with aortic stenosis (AS) efficiently. However, the uneven valve expansion can cause a non-circular annulus, which is one of the main factors leading to complications after TAVI. As a preliminary work, the main purpose of this study was to evaluate the risk of adverse aortic events in patients with a non-circular aortic annulus after TAVI. This study numerically investigated the distribution of four wall shear stress (WSS)-based indicators and three helicity-based indicators in eight patient-specific aortas with different annulus including circular, type I elliptical and type II elliptical shapes. Both elliptical annulus features can significantly enhance the intensity of the helicity (<i>h</i>2) in the ascending aorta (<i>p</i>?&lt;?0.001). However, for the type I elliptical annulus, the spiral flow structure was changed into low-velocity and disturbed flow pattern close to the inner side of the aortic arch. For the type II elliptical annulus, the spiral flow remained but became skewed in distribution. The elliptical annulus feature could increase the general level WSS-based indicators, especially in the ascending aorta. However, due to the disturbance of spiral flow or second helical flow in ascending aortas, areas with low TAWSS accompanied by high oscillatory shear index (OSI) and cross flow index (CFI) were observed in all the ascending aortas with non-circular annulus. The elliptical annulus feature can change the hemodynamic environment in the aortic arch, especially in the ascending aorta. Although both elliptical annulus features enhanced the strength of helicity, the uniform distribution of the helical flow was disturbed, especially in the ascending aorta, indicating the potential risk of adverse aortic events may increase. Therefore, for the patients without paravalvular leak but elliptical annulus shape after TAVI treatment, surgeons may be needed to consider further dilatation to make the non-circular annulus become circular.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 4","pages":"1379 - 1394"},"PeriodicalIF":3.5,"publicationDate":"2023-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4356600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Biomechanical and transcriptional evidence that smooth muscle cell death drives an osteochondrogenic phenotype and severe proximal vascular disease in progeria 生物力学和转录证据表明,平滑肌细胞死亡驱动骨质增生表型和早衰患者的严重近端血管疾病
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-05-07 DOI: 10.1007/s10237-023-01722-5
Sae-Il Murtada, Yuki Kawamura, Cristina Cavinato, Molly Wang, Abhay B. Ramachandra, Bart Spronck, David S. Li, George Tellides, Jay D. Humphrey
{"title":"Biomechanical and transcriptional evidence that smooth muscle cell death drives an osteochondrogenic phenotype and severe proximal vascular disease in progeria","authors":"Sae-Il Murtada,&nbsp;Yuki Kawamura,&nbsp;Cristina Cavinato,&nbsp;Molly Wang,&nbsp;Abhay B. Ramachandra,&nbsp;Bart Spronck,&nbsp;David S. Li,&nbsp;George Tellides,&nbsp;Jay D. Humphrey","doi":"10.1007/s10237-023-01722-5","DOIUrl":"10.1007/s10237-023-01722-5","url":null,"abstract":"<div><p>Hutchinson–Gilford Progeria Syndrome results in rapid aging and severe cardiovascular sequelae that accelerate near end-of-life. We found a progressive disease process in proximal elastic arteries that was less evident in distal muscular arteries. Changes in aortic structure and function were then associated with changes in transcriptomics assessed via both bulk and single cell RNA sequencing, which suggested a novel sequence of progressive aortic disease: adverse extracellular matrix remodeling followed by mechanical stress-induced smooth muscle cell death, leading a subset of remnant smooth muscle cells to an osteochondrogenic phenotype that results in an accumulation of proteoglycans that thickens the aortic wall and increases pulse wave velocity, with late calcification exacerbating these effects. Increased central artery pulse wave velocity is known to drive left ventricular diastolic dysfunction, the primary diagnosis in progeria children. It appears that mechanical stresses above ~?80?kPa initiate this progressive aortic disease process, explaining why elastic lamellar structures that are organized early in development under low wall stresses appear to be nearly normal whereas other medial constituents worsen progressively in adulthood. Mitigating early mechanical stress-driven smooth muscle cell loss/phenotypic modulation promises to have important cardiovascular implications in progeria patients.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 4","pages":"1333 - 1347"},"PeriodicalIF":3.5,"publicationDate":"2023-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01722-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4312989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The analytical solution to the migration of an epithelial monolayer with a circular spreading front and its implications in the gap closure process 具有圆形扩散前沿的上皮单层迁移的解析解及其在间隙闭合过程中的意义
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-05-07 DOI: 10.1007/s10237-023-01723-4
Tiankai Zhao, Hongyan Yuan
{"title":"The analytical solution to the migration of an epithelial monolayer with a circular spreading front and its implications in the gap closure process","authors":"Tiankai Zhao,&nbsp;Hongyan Yuan","doi":"10.1007/s10237-023-01723-4","DOIUrl":"10.1007/s10237-023-01723-4","url":null,"abstract":"<div><p>The coordinated behaviors of epithelial cells are widely observed in tissue development, such as re-epithelialization, tumor growth, and morphogenesis. In these processes, cells either migrate collectively or organize themselves into specific structures to serve certain purposes. In this work, we study a spreading epithelial monolayer whose migrating front encloses a circular gap in the monolayer center. Such tissue is usually used to mimic the wound healing process in vitro. We model the epithelial sheet as a layer of active viscous polar fluid. With an axisymmetric assumption, the model can be analytically solved under two special conditions, suggesting two possible spreading modes for the epithelial monolayer. Based on these two sets of analytical solutions, we assess the velocity of the spreading front affected by the gap size, the active intercellular contractility, and the purse-string contraction acting on the spreading edge. Several critical values exist in the model parameters for the initiation of the gap closure process, and the purse-string contraction plays a vital role in governing the gap closure kinetics. Finally, the instability of the morphology of the spreading front was studied. Numerical calculations show how the perturbated velocities and the growth rates vary with respect to different model parameters.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 4","pages":"1349 - 1363"},"PeriodicalIF":3.5,"publicationDate":"2023-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01723-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4312984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of myocardial sheetlet sliding on left ventricular function 心肌薄片滑动对左心室功能的影响
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-05-06 DOI: 10.1007/s10237-023-01721-6
Yu Zheng, Wei Xuan Chan, Sonia Nielles-Vallespin, Andrew D. Scott, Pedro F. Ferreira, Hwa Liang Leo, Choon Hwai Yap
{"title":"Effects of myocardial sheetlet sliding on left ventricular function","authors":"Yu Zheng,&nbsp;Wei Xuan Chan,&nbsp;Sonia Nielles-Vallespin,&nbsp;Andrew D. Scott,&nbsp;Pedro F. Ferreira,&nbsp;Hwa Liang Leo,&nbsp;Choon Hwai Yap","doi":"10.1007/s10237-023-01721-6","DOIUrl":"10.1007/s10237-023-01721-6","url":null,"abstract":"<div><p>Left ventricle myocardium has a complex micro-architecture, which was revealed to consist of myocyte bundles arranged in a series of laminar sheetlets. Recent imaging studies demonstrated that these sheetlets re-orientated and likely slided over each other during the deformations between systole and diastole, and that sheetlet dynamics were altered during cardiomyopathy. However, the biomechanical effect of sheetlet sliding is not well-understood, which is the focus here. We conducted finite element simulations of the left ventricle (LV) coupled with a windkessel lumped parameter model to study sheetlet sliding, based on cardiac MRI of a healthy human subject, and modifications to account for hypertrophic and dilated geometric changes during cardiomyopathy remodeling. We modeled sheetlet sliding as a reduced shear stiffness in the sheet-normal direction and observed that (1) the diastolic sheetlet orientations must depart from alignment with the LV wall plane in order for sheetlet sliding to have an effect on cardiac function, that (2) sheetlet sliding modestly aided cardiac function of the healthy and dilated hearts, in terms of ejection fraction, stroke volume, and systolic pressure generation, but its effects were amplified during hypertrophic cardiomyopathy and diminished during dilated cardiomyopathy due to both sheetlet angle configuration and geometry, and that (3) where sheetlet sliding aided cardiac function, it increased tissue stresses, particularly in the myofibre direction. We speculate that sheetlet sliding is a tissue architectural adaptation to allow easier deformations of the LV walls so that LV wall stiffness will not hinder function, and to provide a balance between function and tissue stresses. A limitation here is that sheetlet sliding is modeled as a simple reduction in shear stiffness, without consideration of micro-scale sheetlet mechanics and dynamics.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 4","pages":"1313 - 1332"},"PeriodicalIF":3.5,"publicationDate":"2023-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01721-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4265799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of growth-induced, mechanical stress in solid tumors and spatial association with extracellular matrix content 实体瘤生长诱导的机械应力及其与细胞外基质含量的空间相关性评价
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-05-02 DOI: 10.1007/s10237-023-01716-3
Andreas G. Hadjigeorgiou, Triantafyllos Stylianopoulos
{"title":"Evaluation of growth-induced, mechanical stress in solid tumors and spatial association with extracellular matrix content","authors":"Andreas G. Hadjigeorgiou,&nbsp;Triantafyllos Stylianopoulos","doi":"10.1007/s10237-023-01716-3","DOIUrl":"10.1007/s10237-023-01716-3","url":null,"abstract":"<div><p>Mechanical stresses in solid tumors play an important role in tumor progression and treatment efficacy but their quantification is under-investigated. Here, we developed an experimental and computational approach to calculate growth-induced, residual stresses and applied it to the breast (4T1), pancreatic (PAN02), and fibrosarcoma (MCA205) tumor models. Following resection, tumors are embedded in agarose gels and cuts are made in two perpendicular directions to release residual stress. With the use of image processing, the detailed bulging displacement profile is measured and finite elements models of the bulging geometry are developed for the quantification of the stress levels. The mechanical properties of the tumors are measured in vivo prior to resection with shear wave elastography. We find that the average magnitude of residual stresses ranges from 3.31 to 10.88 kPa, and they are non-uniformly distributed within the tissue due to the heterogeneity of the tumor microenvironment. Interestingly, we demonstrate that a second cut can still release a significant amount of stresses. We further find a strong association of spatial hyaluronan and collagen content with the spatial profile of stress for the MCA205 and PAN02 tumors and a partial association for the 4T1. Interestingly the colocalization of hyaluronan and collagen content had a stronger association with the spatial profile of stress for MCA205, PAN02, and 4T1. Finally, measurements of the elastic modulus with shear wave elastography show a nonlinear correlation with tumor volume for the more fibrotic MCA205 and 4T1 tumors. Overall, our results provide insights for a better understanding of the mechanical behavior of tumors.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 5","pages":"1625 - 1643"},"PeriodicalIF":3.5,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41079830","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Constituent-based quasi-linear viscoelasticity: a revised quasi-linear modelling framework to capture nonlinear viscoelasticity in arteries 基于成分的拟线性粘弹性:一个用于捕捉动脉非线性粘弹性的修正的拟线性建模框架
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-05-02 DOI: 10.1007/s10237-023-01711-8
Alessandro Giudici, Koen W. F. van der Laan, Myrthe M. van der Bruggen, Shaiv Parikh, Eline Berends, Sébastien Foulquier, Tammo Delhaas, Koen D. Reesink, Bart Spronck
{"title":"Constituent-based quasi-linear viscoelasticity: a revised quasi-linear modelling framework to capture nonlinear viscoelasticity in arteries","authors":"Alessandro Giudici,&nbsp;Koen W. F. van der Laan,&nbsp;Myrthe M. van der Bruggen,&nbsp;Shaiv Parikh,&nbsp;Eline Berends,&nbsp;Sébastien Foulquier,&nbsp;Tammo Delhaas,&nbsp;Koen D. Reesink,&nbsp;Bart Spronck","doi":"10.1007/s10237-023-01711-8","DOIUrl":"10.1007/s10237-023-01711-8","url":null,"abstract":"<div><p>Arteries exhibit fully nonlinear viscoelastic behaviours (i.e. both elastically and viscously nonlinear). While elastically nonlinear arterial models are well established, effective mathematical descriptions of nonlinear <i>visco</i>elasticity are lacking. Quasi-linear viscoelasticity (QLV) offers a convenient way to mathematically describe viscoelasticity, but its viscous linearity assumption is unsuitable for whole-wall vascular applications. Conversely, application of fully nonlinear viscoelastic models, involving deformation-dependent viscous parameters, to experimental data is impractical and often reduces to identifying specific solutions for each tested loading condition. The present study aims to address this limitation: By applying QLV theory at the wall <i>constituent</i> rather than at the <i>whole-wall</i> level, the deformation-dependent relative contribution of the constituents allows to capture nonlinear viscoelasticity with a unique set of deformation-independent model parameters. Five murine common carotid arteries were subjected to a protocol of quasi-static and harmonic, pseudo-physiological biaxial loading conditions to characterise their viscoelastic behaviour. The arterial wall was modelled as a constrained mixture of an isotropic elastin matrix and four families of collagen fibres. Constituent-based QLV was implemented by assigning different relaxation functions to collagen- and elastin-borne parts of the wall stress. Nonlinearity in viscoelasticity was assessed via the pressure dependency of the dynamic-to-quasi-static stiffness ratio. The experimentally measured ratio increased with pressure, from 1.03 <span>(pm)</span> 0.03 (mean <span>(pm)</span> standard deviation) at 80–40 mmHg to 1.58 <span>(pm)</span> 0.22 at 160–120 mmHg. Constituent-based QLV captured well this trend by attributing the wall viscosity predominantly to collagen fibres, whose recruitment starts at physiological pressures. In conclusion, constituent-based QLV offers a practical and effective solution to model arterial viscoelasticity.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 5","pages":"1607 - 1623"},"PeriodicalIF":3.5,"publicationDate":"2023-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01711-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41079829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
In silico experiments of intimal hyperplasia development: disendothelization in an axisymmetric idealized artery 内膜增生发育的硅片实验:轴对称理想化动脉的去内皮化
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-04-28 DOI: 10.1007/s10237-023-01720-7
Jérôme Jansen, Xavier Escriva, Fabien Godeferd, Patrick Feugier
{"title":"In silico experiments of intimal hyperplasia development: disendothelization in an axisymmetric idealized artery","authors":"Jérôme Jansen,&nbsp;Xavier Escriva,&nbsp;Fabien Godeferd,&nbsp;Patrick Feugier","doi":"10.1007/s10237-023-01720-7","DOIUrl":"10.1007/s10237-023-01720-7","url":null,"abstract":"<div><p>We use in silico experiments to study the role of the hemodynamics and of the type of disendothelization on the physiopathology of intimal hyperplasia. We apply a multiscale bio-chemo-mechanical model of intimal hyperplasia on an idealized axisymmetric artery that suffers two kinds of disendothelizations. The model predicts the spatio-temporal evolution of the lesions development, initially localized at the site of damages, and after few days displaced downstream of the damaged zones, these two stages being observed whatever the kind of damage. Considering macroscopic quantities, the model sensitivity to pathology-protective and pathology-promoting zones is qualitatively consistent with experimental findings. The simulated pathological evolutions demonstrate the central role of two parameters: (a) the initial damage shape on the morphology of the incipient stenosis, and (b) the local wall shear stresses on the overall spatio-temporal dynamics of the lesion.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 4","pages":"1289 - 1311"},"PeriodicalIF":3.5,"publicationDate":"2023-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01720-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5064004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Mechanobiology of the relocation of proteins in advecting cells: in vitro experiments, multi-physics modeling, and simulations 蛋白质在平流细胞中重新定位的机械生物学:体外实验,多物理场建模和模拟
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-04-17 DOI: 10.1007/s10237-023-01717-2
M. Serpelloni, M. Arricca, C. Ravelli, E. Grillo, S. Mitola, A. Salvadori
{"title":"Mechanobiology of the relocation of proteins in advecting cells: in vitro experiments, multi-physics modeling, and simulations","authors":"M. Serpelloni,&nbsp;M. Arricca,&nbsp;C. Ravelli,&nbsp;E. Grillo,&nbsp;S. Mitola,&nbsp;A. Salvadori","doi":"10.1007/s10237-023-01717-2","DOIUrl":"10.1007/s10237-023-01717-2","url":null,"abstract":"<div><p>Cell motility—a cellular behavior of paramount relevance in embryonic development, immunological response, metastasis, or angiogenesis—demands a mechanical deformation of the cell membrane and influences the surface motion of molecules and their biochemical interactions. In this work, we develop a fully coupled multi-physics model able to capture and predict the protein flow on endothelial advecting plasma membranes. The model has been validated against co-designed in vitro experiments. The complete picture of the receptor dynamics has been understood, and limiting factors have been identified together with the laws that regulate receptor polarization. This computational approach might be insightful in the prediction of endothelial cell behavior in different tumoral environments, circumventing the time-consuming and expensive empirical characterization of each tumor.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 4","pages":"1267 - 1287"},"PeriodicalIF":3.5,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01717-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4667068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Computational study of biomechanical drivers of renal cystogenesis 肾囊形成生物力学驱动因素的计算研究
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-04-06 DOI: 10.1007/s10237-023-01704-7
Gerard A. Ateshian, Katherine A. Spack, James C. Hone, Evren U. Azeloglu, G. Luca Gusella
{"title":"Computational study of biomechanical drivers of renal cystogenesis","authors":"Gerard A. Ateshian,&nbsp;Katherine A. Spack,&nbsp;James C. Hone,&nbsp;Evren U. Azeloglu,&nbsp;G. Luca Gusella","doi":"10.1007/s10237-023-01704-7","DOIUrl":"10.1007/s10237-023-01704-7","url":null,"abstract":"<div><p>Renal cystogenesis is the pathological hallmark of autosomal dominant polycystic kidney disease, caused by <i>PKD1</i> and <i>PKD2</i> mutations. The formation of renal cysts is a common manifestation in ciliopathies, a group of syndromic disorders caused by mutation of proteins involved in the assembly and function of the primary cilium. Cystogenesis is caused by the derailment of the renal tubular architecture and tissue deformation that eventually leads to the impairment of kidney function. However, the biomechanical imbalance of cytoskeletal forces that are altered in cells with <i>Pkd1</i> mutations has never been investigated, and its nature and extent remain unknown. In this computational study, we explored the feasibility of various biomechanical drivers of renal cystogenesis by examining several hypothetical mechanisms that may promote morphogenetic markers of cystogenesis. Our objective was to provide physics-based guidance for our formulation of hypotheses and our design of experimental studies investigating the role of biomechanical disequilibrium in cystogenesis. We employed the finite element method to explore the role of (1) wild-type versus mutant cell elastic modulus; (2) contractile stress magnitude in mutant cells; (3) localization and orientation of contractile stress in mutant cells; and (4) sequence of cell contraction and cell proliferation. Our objective was to identify the factors that produce the characteristic tubular cystic growth. Results showed that cystogenesis occurred only when mutant cells contracted along the apical-basal axis, followed or accompanied by cell proliferation, as long as mutant cells had comparable or lower elastic modulus than wild-type cells, with their contractile stresses being significantly greater than their modulus. Results of these simulations allow us to focus future in vitro and in vivo experimental studies on these factors, helping us formulate physics-based hypotheses for renal tubule cystogenesis.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 4","pages":"1113 - 1127"},"PeriodicalIF":3.5,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01704-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4238099","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Patient-specific computational simulations of wound healing following midline laparotomy closure 中线剖腹术后伤口愈合的患者特异性计算模拟
IF 3.5 3区 医学
Biomechanics and Modeling in Mechanobiology Pub Date : 2023-04-06 DOI: 10.1007/s10237-023-01708-3
Ali Akbar Karkhaneh Yousefi, Baptiste Pierrat, Anicet Le Ruyet, Stéphane Avril
{"title":"Patient-specific computational simulations of wound healing following midline laparotomy closure","authors":"Ali Akbar Karkhaneh Yousefi,&nbsp;Baptiste Pierrat,&nbsp;Anicet Le Ruyet,&nbsp;Stéphane Avril","doi":"10.1007/s10237-023-01708-3","DOIUrl":"10.1007/s10237-023-01708-3","url":null,"abstract":"<div><p>In the current study, we developed a new computational methodology to simulate wound healing in soft tissues. We assumed that the injured tissue recovers partially its mechanical strength and stiffness by gradually increasing the volume fraction of collagen fibers. Following the principles of the constrained mixture theory, we assumed that new collagen fibers are deposited at homeostatic tension while the already existing tissue undergoes a permanent deformation due to the effects of remodeling. The model was implemented in the finite-element software Abaqus<sup>®</sup> through a VUMAT subroutine and applied to a complex and realistic case: simulating wound healing following midline laparotomy closure. The incidence of incisional hernia is still quite significant clinically, and our goal was to investigate different conditions hampering the success of these procedures. We simulated wound healing over periods of 6 months on a patient-specific geometry. One of the outcomes of the finite-element simulations was the width of the wound tissue, which was found to be clinically correlated with the development of incisional hernia after midline laparotomy closure. We studied the impact of different suturing modalities and the effects of situations inducing increased intra-abdominal pressure or its intermittent variations such as coughing. Eventually, the results showed that the main risks of developing an incisional hernia mostly depend on the elastic strains reached in the wound tissue after degradation of the suturing wires. Despite the need for clinical validation, these results are promising for establishing a digital twin of wound healing in midline laparotomy incision.</p></div>","PeriodicalId":489,"journal":{"name":"Biomechanics and Modeling in Mechanobiology","volume":"22 5","pages":"1589 - 1605"},"PeriodicalIF":3.5,"publicationDate":"2023-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10237-023-01708-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41079738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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