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Sampietro M, Cassina V, Salerno D, Barbaglio F, Buglione E, Marrano CA, Campanile R, Scarfò L, Biedenweg D, Fregin B, Zamai M, Díaz Torres A, Labrador Cantarero V, Ghia P, Otto O, Mantegazza F, Caiolfa VR, Scielzo C. The Nanomechanical Properties of CLL Cells Are Linked to the Actin Cytoskeleton and Are a Potential Target of BTK Inhibitors. Hemasphere 2023; 7:e931. [PMID: 37492437 PMCID: PMC10365208 DOI: 10.1097/hs9.0000000000000931] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Accepted: 06/15/2023] [Indexed: 07/27/2023] Open
Abstract
Chronic lymphocytic leukemia (CLL) is an incurable disease characterized by an intense trafficking of the leukemic cells between the peripheral blood and lymphoid tissues. It is known that the ability of lymphocytes to recirculate strongly depends on their capability to rapidly rearrange their cytoskeleton and adapt to external cues; however, little is known about the differences occurring between CLL and healthy B cells during these processes. To investigate this point, we applied a single-cell optical (super resolution microscopy) and nanomechanical approaches (atomic force microscopy, real-time deformability cytometry) to both CLL and healthy B lymphocytes and compared their behavior. We demonstrated that CLL cells have a specific actomyosin complex organization and altered mechanical properties in comparison to their healthy counterpart. To evaluate the clinical relevance of our findings, we treated the cells in vitro with the Bruton's tyrosine kinase inhibitors and we found for the first time that the drug restores the CLL cells mechanical properties to a healthy phenotype and activates the actomyosin complex. We further validated these results in vivo on CLL cells isolated from patients undergoing ibrutinib treatment. Our results suggest that CLL cells' mechanical properties are linked to their actin cytoskeleton organization and might be involved in novel mechanisms of drug resistance, thus becoming a new potential therapeutic target aiming at the normalization of the mechanical fingerprints of the leukemic cells.
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Affiliation(s)
- Marta Sampietro
- School of Medicine and Surgery, BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Vedano al Lambro, Italy
- Unit of Malignant B cells biology and 3D modelling, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy
- Unit of Microscopy and Dynamic Imaging, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Valeria Cassina
- School of Medicine and Surgery, BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Vedano al Lambro, Italy
| | - Domenico Salerno
- School of Medicine and Surgery, BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Vedano al Lambro, Italy
| | - Federica Barbaglio
- Unit of Malignant B cells biology and 3D modelling, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Enrico Buglione
- School of Medicine and Surgery, BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Vedano al Lambro, Italy
| | - Claudia Adriana Marrano
- School of Medicine and Surgery, BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Vedano al Lambro, Italy
| | - Riccardo Campanile
- School of Medicine and Surgery, BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Vedano al Lambro, Italy
| | - Lydia Scarfò
- Unit B Cell Neoplasia, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy
- Università Vita-Salute San Raffaele, Milan, Italy
- Strategic Research Program on CLL, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Doreen Biedenweg
- Klinik für Innere Medizin B, Universitätsmedizin Greifswald, Fleischmannstr, Germany
| | - Bob Fregin
- Deutsches Zentrum für Herz-Kreislauf-Forschung e.V., Standort Greifswald, Universitätsmedizin Greifswald, Fleischmannstr, Germany
- Zentrum für Innovationskompetenz: Humorale Immunreaktionen bei kardiovaskulären Erkrankungen, Universität Greifswald, Fleischmannstr, Germany
- Institute of Physics, Universität Greifswald, Felix-Hausdorff-Strasse, Germany
| | - Moreno Zamai
- Unit of Microscopy and Dynamic Imaging, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Alfonsa Díaz Torres
- Unit of Microscopy and Dynamic Imaging, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Veronica Labrador Cantarero
- Unit of Microscopy and Dynamic Imaging, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Paolo Ghia
- Unit B Cell Neoplasia, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy
- Università Vita-Salute San Raffaele, Milan, Italy
- Strategic Research Program on CLL, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Oliver Otto
- Deutsches Zentrum für Herz-Kreislauf-Forschung e.V., Standort Greifswald, Universitätsmedizin Greifswald, Fleischmannstr, Germany
- Zentrum für Innovationskompetenz: Humorale Immunreaktionen bei kardiovaskulären Erkrankungen, Universität Greifswald, Fleischmannstr, Germany
- Institute of Physics, Universität Greifswald, Felix-Hausdorff-Strasse, Germany
| | - Francesco Mantegazza
- School of Medicine and Surgery, BioNanoMedicine Center NANOMIB, Università di Milano-Bicocca, Vedano al Lambro, Italy
| | - Valeria R. Caiolfa
- Unit of Microscopy and Dynamic Imaging, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
- Experimental Imaging Center, IRCCS Ospedale San Raffaele, Milan, Italy
| | - Cristina Scielzo
- Unit of Malignant B cells biology and 3D modelling, Division of Experimental Oncology, IRCCS Ospedale San Raffaele, Milan, Italy
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2
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Velasco V, Soucy P, Keynton R, Williams SJ. A microfluidic impedance platform for real-time, in vitro characterization of endothelial cells undergoing fluid shear stress. LAB ON A CHIP 2022; 22:4705-4716. [PMID: 36349980 DOI: 10.1039/d2lc00555g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
We introduce a microfluidic impedance platform to electrically monitor in real-time, endothelium monolayers undergoing fluid shear stress. Our platform incorporates sensing electrodes (SEs) that measure cell behavior and cell-free control electrodes that measure cell culture media resistance simultaneously but independently from SEs. We evaluated three different cellular subpopulations sizes through 50, 100, and 200 μm diameter SEs. We tested their utility in measuring the response of human umbilical vein endothelial cells (HUVECs) at static, constant (17.6 dyne per cm2), and stepped (23.7-35-58.1 dyne per cm2) shear stress conditions. For 14 hours, we collected the impedance spectra (100 Hz-1 MHz) of sheared cells. Using equivalent circuit models, we extracted monolayer permeability (RTER), cell membrane capacitance, and cell culture media resistance. Platform evaluation concluded that: (1) 50 μm SEs (∼2 cells) suffered interfacial capacitance and reduced cell measurement sensitivity, (2) 100 μm SEs (∼6 cells) was limited to measuring cell behavior only and cannot measure cell culture media resistance, and (3) 200 μm SEs (∼20 cells) detected cell behavior with accurate prediction of cell culture media resistance. Platform-based shear stress studies indicated a shear magnitude dependent increase in RTER at the onset of acute flow. Consecutive stepped shear conditions did not alter RTER in the same magnitude after shear has been applied. Finally, endpoint staining of VE-cadherin on the actual SEs and endpoint RTER measurements were greater for 23.7-35-58.1 dyne per cm2 than 17.6 dyne per cm2 shear conditions.
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Affiliation(s)
- Vanessa Velasco
- Stanford Genome Technology Center, Stanford University, 3165 Porter Drive, Palo Alto, CA 94304, USA
| | - Patricia Soucy
- Bioengineering Department, University of Louisville, 2301 S. Third St., Paul C. Lutz Hall, # 419, Louisville, KY 40292, USA
| | - Robert Keynton
- William States Lee College of Engineering, University of North Carolina, Charlotte, 28223, USA
| | - Stuart J Williams
- Mechanical Engineering Department, University of Louisville, 332 Eastern Pkwy, Sackett Hall, # 202A, Louisville, KY 40292, USA
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3
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Hoyle H, Stenger C, Przyborski S. Design considerations of benchtop fluid flow bioreactors for bio-engineered tissue equivalents in vitro. BIOMATERIALS AND BIOSYSTEMS 2022; 8:100063. [PMID: 36824373 PMCID: PMC9934498 DOI: 10.1016/j.bbiosy.2022.100063] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 07/08/2022] [Accepted: 08/30/2022] [Indexed: 10/14/2022] Open
Abstract
One of the major aims of bio-engineering tissue equivalents in vitro is to create physiologically relevant culture conditions to accurately recreate the cellular microenvironment. This often includes incorporation of factors such as the extracellular matrix, co-culture of multiple cell types and three-dimensional culture techniques. These advanced techniques can recapitulate some of the properties of tissue in vivo, however fluid flow is a key aspect that is often absent. Fluid flow can be introduced into cell and tissue culture using bioreactors, which are becoming increasingly common as we seek to produce increasingly accurate tissue models. Bespoke technology is continuously being developed to tailor systems for specific applications and to allow compatibility with a range of culture techniques. For effective perfusion of a tissue culture many parameters can be controlled, ranging from impacts of the fluid flow such as increased shear stress and mass transport, to potentially unwanted side effects such as temperature fluctuations. A thorough understanding of these properties and their implications on the culture model can aid with a more accurate interpretation of results. Improved and more complete characterisation of bioreactor properties will also lead to greater accuracy when reporting culture conditions in protocols, aiding experimental reproducibility, and allowing more precise comparison of results between different systems. In this review we provide an analysis of the different factors involved in the development of benchtop flow bioreactors and their potential biological impacts across a range of applications.
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Key Words
- 3D, three-dimensional
- ABS, acrylonitrile butadiene styrene
- ALI, air-liquid interface
- Bioreactors
- CFD, computational fluid dynamics
- Cell culture
- ECM, extracellular matrix
- FDM, fused deposition modelling
- Fluid flow
- PC, polycarbonate
- PET, polyethylene terephthalate
- PLA, polylactic acid
- PTFE, polytetrafluoroethylene
- SLA, stereolithography
- Tissue engineering
- UL, unstirred layer
- UV, ultraviolet light
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Affiliation(s)
- H.W. Hoyle
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, UK
| | - C.M.L. Stenger
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, UK
| | - S.A. Przyborski
- Department of Biosciences, Durham University, South Road, Durham DH1 3LE, UK,NETPark Incubator, Reprocell Europe Ltd., Thomas Wright Way, Sedgefield TS21 3FD, UK,Corresponding author at: Department of Biosciences, Durham University, South Road, Durham DH1 3LE, UK.
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4
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Pereiro I, Kartchenko AF, Lovchik RD, Kaigala GV. Simple add-on devices to enhance the efficacy of conventional surface immunoassays implemented on standard labware. Analyst 2022; 147:2040-2047. [DOI: 10.1039/d2an00214k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We propose microfluidic add-ons easily placed on standard assay labware such as microwells and slides to enhance the kinetics of immunoassays. The devices are compatible with mass production, well-established assay protocols and automated platforms.
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Affiliation(s)
- Iago Pereiro
- IBM Research Europe – Zurich, Säumerstrasse 4, Rüschlikon, CH-8803, Switzerland
| | | | - Robert D. Lovchik
- IBM Research Europe – Zurich, Säumerstrasse 4, Rüschlikon, CH-8803, Switzerland
| | - Govind V. Kaigala
- IBM Research Europe – Zurich, Säumerstrasse 4, Rüschlikon, CH-8803, Switzerland
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5
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2D Projection Maps of WSS and OSI Reveal Distinct Spatiotemporal Changes in Hemodynamics in the Murine Aorta during Ageing and Atherosclerosis. Biomedicines 2021; 9:biomedicines9121856. [PMID: 34944672 PMCID: PMC8698968 DOI: 10.3390/biomedicines9121856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/24/2021] [Accepted: 12/02/2021] [Indexed: 11/17/2022] Open
Abstract
Growth, ageing and atherosclerotic plaque development alter the biomechanical forces acting on the vessel wall. However, monitoring the detailed local changes in wall shear stress (WSS) at distinct sites of the murine aortic arch over time has been challenging. Here, we studied the temporal and spatial changes in flow, WSS, oscillatory shear index (OSI) and elastic properties of healthy wildtype (WT, n = 5) and atherosclerotic apolipoprotein E-deficient (Apoe-/-, n = 6) mice during ageing and atherosclerosis using high-resolution 4D flow magnetic resonance imaging (MRI). Spatially resolved 2D projection maps of WSS and OSI of the complete aortic arch were generated, allowing the pixel-wise statistical analysis of inter- and intragroup hemodynamic changes over time and local correlations between WSS, pulse wave velocity (PWV), plaque and vessel wall characteristics. The study revealed converse differences of local hemodynamic profiles in healthy WT and atherosclerotic Apoe-/- mice, and we identified the circumferential WSS as potential marker of plaque size and composition in advanced atherosclerosis and the radial strain as a potential marker for vascular elasticity. Two-dimensional (2D) projection maps of WSS and OSI, including statistical analysis provide a powerful tool to monitor local aortic hemodynamics during ageing and atherosclerosis. The correlation of spatially resolved hemodynamics and plaque characteristics could significantly improve our understanding of the impact of hemodynamics on atherosclerosis, which may be key to understand plaque progression towards vulnerability.
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6
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Yang CY, Chang PY, Wu BS, Tarng DC, Lee OKS. Mechanical and chemical cues synergistically promote human venous smooth muscle cell osteogenesis through integrin β1-ERK1/2 signaling: A cell model of hemodialysis fistula calcification. FASEB J 2021; 35:e22042. [PMID: 34758125 DOI: 10.1096/fj.202101064rr] [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: 06/24/2021] [Revised: 10/25/2021] [Accepted: 10/29/2021] [Indexed: 11/11/2022]
Abstract
Arteriovenous fistula (AVF) is the vascular access of choice for renal replacement therapy. However, AVF is susceptible to calcification with a high prevalence of 40%-65% in chronic hemodialysis patients. Repeated needle puncture for hemodialysis cannulation results in intimal denudation of AVF. We hypothesized that exposure to blood shear stress in the medial layer promotes venous smooth muscle cell (SMC) osteogenesis. While previous studies of shear stress focused on arterial-type SMCs, SMCs isolated from the vein had not been investigated. This study established a venous cell model of AVF using the fluid shear device, combined with a high phosphate medium to mimic the uremic milieu. Osteogenic gene expression of venous SMCs upon mechanical and chemical cues was analyzed in addition to the activated cell signaling pathways. Our findings indicated that upon shear stress and high phosphate environment, mechanical stimulation (shear stress) had an additive effect in up-regulation of an early osteogenic marker, Runx2. We further identified that the integrin β1-ERK1/2 signaling pathway was responsible for the molecular basis of venous SMC osteogenesis upon shear stress exposure. Mitochondrial biogenesis also took part in the early stage of this venopathy pathogenesis, evident by the up-regulated mitochondrial transcription factor A and mitochondrial DNA polymerase γ in venous SMCs. In conclusion, synergistic effects of fluid shear stress and high phosphate induce venous SMC osteogenesis via the ERK1/2 pathway through activating the mechanosensing integrin β1 signaling. The present study identified a promising druggable target for reducing AVF calcification, which deserves further in vivo investigations.
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Affiliation(s)
- Chih-Yu Yang
- Institute of Clinical Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Faculty of Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Division of Nephrology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.,Center for Intelligent Drug Systems and Smart Bio-Devices (IDS2B), Ministry of Education, Taipei, Taiwan.,Stem Cell Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Pu-Yuan Chang
- Institute of Clinical Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Bo-Sheng Wu
- Institute of Clinical Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Faculty of Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan
| | - Der-Cherng Tarng
- Institute of Clinical Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Faculty of Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Division of Nephrology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.,Center for Intelligent Drug Systems and Smart Bio-Devices (IDS2B), Ministry of Education, Taipei, Taiwan
| | - Oscar Kuang-Sheng Lee
- Institute of Clinical Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Faculty of Medicine, School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Stem Cell Research Center, National Yang Ming Chiao Tung University, Taipei, Taiwan.,Department of Orthopedics, China Medical University Hospital, Taichung, Taiwan
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7
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Jensen LF, Bentzon JF, Albarrán-Juárez J. The Phenotypic Responses of Vascular Smooth Muscle Cells Exposed to Mechanical Cues. Cells 2021; 10:2209. [PMID: 34571858 PMCID: PMC8469800 DOI: 10.3390/cells10092209] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/17/2021] [Accepted: 08/23/2021] [Indexed: 12/12/2022] Open
Abstract
During the development of atherosclerosis and other vascular diseases, vascular smooth muscle cells (SMCs) located in the intima and media of blood vessels shift from a contractile state towards other phenotypes that differ substantially from differentiated SMCs. In addition, these cells acquire new functions, such as the production of alternative extracellular matrix (ECM) proteins and signal molecules. A similar shift in cell phenotype is observed when SMCs are removed from their native environment and placed in a culture, presumably due to the absence of the physiological signals that maintain and regulate the SMC phenotype in the vasculature. The far majority of studies describing SMC functions have been performed under standard culture conditions in which cells adhere to a rigid and static plastic plate. While these studies have contributed to discovering key molecular pathways regulating SMCs, they have a significant limitation: the ECM microenvironment and the mechanical forces transmitted through the matrix to SMCs are generally not considered. Here, we review and discuss the recent literature on how the mechanical forces and derived biochemical signals have been shown to modulate the vascular SMC phenotype and provide new perspectives about their importance.
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Affiliation(s)
- Lise Filt Jensen
- Atherosclerosis Research Unit, Department of Clinical Medicine, Aarhus University, 8200 Aarhus, Denmark; (L.F.J.); (J.F.B.)
| | - Jacob Fog Bentzon
- Atherosclerosis Research Unit, Department of Clinical Medicine, Aarhus University, 8200 Aarhus, Denmark; (L.F.J.); (J.F.B.)
- Experimental Pathology of Atherosclerosis Laboratory, Spanish National Center for Cardiovascular Research (CNIC), 28029 Madrid, Spain
- Steno Diabetes Center Aarhus, Department of Clinical Medicine, Aarhus University, 8200 Aarhus, Denmark
| | - Julian Albarrán-Juárez
- Atherosclerosis Research Unit, Department of Clinical Medicine, Aarhus University, 8200 Aarhus, Denmark; (L.F.J.); (J.F.B.)
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8
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Andelovic K, Winter P, Jakob PM, Bauer WR, Herold V, Zernecke A. Evaluation of Plaque Characteristics and Inflammation Using Magnetic Resonance Imaging. Biomedicines 2021; 9:185. [PMID: 33673124 PMCID: PMC7917750 DOI: 10.3390/biomedicines9020185] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 12/19/2022] Open
Abstract
Atherosclerosis is an inflammatory disease of large and medium-sized arteries, characterized by the growth of atherosclerotic lesions (plaques). These plaques often develop at inner curvatures of arteries, branchpoints, and bifurcations, where the endothelial wall shear stress is low and oscillatory. In conjunction with other processes such as lipid deposition, biomechanical factors lead to local vascular inflammation and plaque growth. There is also evidence that low and oscillatory shear stress contribute to arterial remodeling, entailing a loss in arterial elasticity and, therefore, an increased pulse-wave velocity. Although altered shear stress profiles, elasticity and inflammation are closely intertwined and critical for plaque growth, preclinical and clinical investigations for atherosclerosis mostly focus on the investigation of one of these parameters only due to the experimental limitations. However, cardiovascular magnetic resonance imaging (MRI) has been demonstrated to be a potent tool which can be used to provide insights into a large range of biological parameters in one experimental session. It enables the evaluation of the dynamic process of atherosclerotic lesion formation without the need for harmful radiation. Flow-sensitive MRI provides the assessment of hemodynamic parameters such as wall shear stress and pulse wave velocity which may replace invasive and radiation-based techniques for imaging of the vascular function and the characterization of early plaque development. In combination with inflammation imaging, the analyses and correlations of these parameters could not only significantly advance basic preclinical investigations of atherosclerotic lesion formation and progression, but also the diagnostic clinical evaluation for early identification of high-risk plaques, which are prone to rupture. In this review, we summarize the key applications of magnetic resonance imaging for the evaluation of plaque characteristics through flow sensitive and morphological measurements. The simultaneous measurements of functional and structural parameters will further preclinical research on atherosclerosis and has the potential to fundamentally improve the detection of inflammation and vulnerable plaques in patients.
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Affiliation(s)
- Kristina Andelovic
- Institute of Experimental Biomedicine, University Hospital Würzburg, 97080 Würzburg, Germany
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
| | - Patrick Winter
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
- Internal Medicine I, Cardiology, University Hospital Würzburg, 97080 Würzburg, Germany;
| | - Peter Michael Jakob
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
| | - Wolfgang Rudolf Bauer
- Internal Medicine I, Cardiology, University Hospital Würzburg, 97080 Würzburg, Germany;
| | - Volker Herold
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
| | - Alma Zernecke
- Institute of Experimental Biomedicine, University Hospital Würzburg, 97080 Würzburg, Germany
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9
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Jeong Y, Yao Y, Yim EKF. Current understanding of intimal hyperplasia and effect of compliance in synthetic small diameter vascular grafts. Biomater Sci 2020; 8:4383-4395. [PMID: 32643723 PMCID: PMC7452756 DOI: 10.1039/d0bm00226g] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Despite much effort, synthetic small diameter vascular grafts still face limited success due to vascular wall thickening known as intimal hyperplasia (IH). Compliance mismatch between graft and native vessels has been proposed to be one of a key mechanical factors of synthetic vascular grafts that could contribute to the formation of IH. While many methods have been developed to determine compliance both in vivo and in vitro, the effects of compliance mismatch still remain uncertain. This review aims to explain the biomechanical factors that are responsible for the formation and development of IH and their relationship with compliance mismatch. Furthermore, this review will address the current methods used to measure compliance both in vitro and in vivo. Lastly, current limitations in understanding the connection between the compliance of vascular grafts and the role it plays in the development and progression of IH will be discussed.
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Affiliation(s)
- YeJin Jeong
- Department of Chemical engineering, University of Waterloo, 200 University Ave W, Waterloo, ON N2L 3G1, Canada.
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10
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Mohammad Mirzaei N, Fok PW. Simple model of atherosclerosis in cylindrical arteries: impact of anisotropic growth on Glagov remodeling. MATHEMATICAL MEDICINE AND BIOLOGY-A JOURNAL OF THE IMA 2020; 38:59-82. [PMID: 32814945 DOI: 10.1093/imammb/dqaa011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 07/08/2020] [Accepted: 07/21/2020] [Indexed: 01/14/2023]
Abstract
In 1987, Seymour Glagov observed that arteries went through a two-stage remodeling process as a result of plaque growth: first, a compensatory phase where the lumen area remains approximately constant and second, an encroachment phase where the lumen area decreases over time. In this paper, we investigate the effect of growth anisotropy on Glagov remodeling in five different cases: pure radial, pure circumferential, pure axial, isotropic and general anisotropic growth where the elements of the growth tensor are chosen to minimize the total energy. We suggest that the nature of anisotropy is inclined towards the growth direction that requires the least amount of energy. Our framework is the theory of morphoelasticity on an axisymmetric arterial domain. For each case, we explore their specific effect on the Glagov curves. For the latter two cases, we also provide the changes in collagen fiber orientation and length in the intima, media and adventitia. In addition, we compare the total energy produced by growth in radial, circumferential and axial direction and deduce that using a radially dominant anisotropic growth leads to lower strain energy than isotropic growth.
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Affiliation(s)
| | - Pak-Wing Fok
- Department of Mathematical Sciences, University of Delaware, Newark, DE 19716, USA
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11
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Pereiro I, Fomitcheva-Khartchenko A, Kaigala GV. Shake It or Shrink It: Mass Transport and Kinetics in Surface Bioassays Using Agitation and Microfluidics. Anal Chem 2020; 92:10187-10195. [PMID: 32515583 DOI: 10.1021/acs.analchem.0c01625] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Surface assays, such as ELISA and immunofluorescence, are nothing short of ubiquitous in biotechnology and medical diagnostics today. The development and optimization of these assays generally focuses on three aspects: immobilization chemistry, ligand-receptor interaction, and concentrations of ligands, buffers, and sample. A fourth aspect, the transport of the analyte to the surface, is more rarely delved into during assay design and analysis. Improving transport is generally limited to the agitation of reagents, a mode of flow generation inherently difficult to control, often resulting in inconsistent reaction kinetics. However, with assay optimization reaching theoretical limits, the role of transport becomes decisive. This perspective develops an intuitive and practical understanding of transport in conventional agitation systems and in microfluidics, the latter underpinning many new life science technologies. We give rules of thumb to guide the user on system behavior, such as advection regimes and shear stress, and derive estimates for relevant quantities that delimit assay parameters. Illustrative cases with examples of experimental results are used to clarify the role of fundamental concepts such as boundary and depletion layers, mass diffusivity, or surface tension.
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Affiliation(s)
- Iago Pereiro
- IBM Research-Europe, Säumerstrasse 4, Rüschlikon CH-8803, Switzerland
| | | | - Govind V Kaigala
- IBM Research-Europe, Säumerstrasse 4, Rüschlikon CH-8803, Switzerland
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12
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Hughes WE, Beyer AM, Gutterman DD. Vascular autophagy in health and disease. Basic Res Cardiol 2020; 115:41. [PMID: 32506214 DOI: 10.1007/s00395-020-0802-6] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 05/26/2020] [Indexed: 12/14/2022]
Abstract
Homeostasis is maintained within organisms through the physiological recycling process of autophagy, a catabolic process that is intricately involved in the mobilization of nutrients during starvation, recycling of cellular cargo, as well as initiation of cellular death pathways. Specific to the cardiovascular system, autophagy responds to both chemical (e.g. free radicals) and mechanical stressors (e.g. shear stress). It is imperative to note that autophagy is not a static process, and measurement of autophagic flux provides a more comprehensive investigation into the role of autophagy. The overarching themes emerging from decades of autophagy research are that basal levels of autophagic flux are critical, physiological stressors may increase or decrease autophagic flux, and more importantly, aberrant deviations from basal autophagy may elicit detrimental effects. Autophagy has predominantly been examined within cardiac or vascular smooth muscle tissue within the context of disease development and progression. Autophagic flux within the endothelium holds an important role in maintaining vascular function, demonstrated by the necessary role for intact autophagic flux for shear-induced release of nitric oxide however the underlying mechanisms have yet to be elucidated. Within this review, we theorize that autophagy itself does not solely control vascular homeostasis, rather, it works in concert with mitochondria, telomerase, and lipids to maintain physiological function. The primary emphasis of this review is on the role of autophagy within the human vasculature, and the integrative effects with physiological processes and diseases as they relate to the vascular structure and function.
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Affiliation(s)
- William E Hughes
- Department of Medicine, Cardiovascular Center, Medical College of Wisconsin, 8701 West Watertown Plank Road, Milwaukee, WI, 53213, USA.
| | - Andreas M Beyer
- Department of Medicine, Cardiovascular Center, Medical College of Wisconsin, 8701 West Watertown Plank Road, Milwaukee, WI, 53213, USA
| | - David D Gutterman
- Department of Medicine, Cardiovascular Center, Medical College of Wisconsin, 8701 West Watertown Plank Road, Milwaukee, WI, 53213, USA
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Warboys CM, Ghim M, Weinberg PD. Understanding mechanobiology in cultured endothelium: A review of the orbital shaker method. Atherosclerosis 2019; 285:170-177. [PMID: 31096159 PMCID: PMC6570700 DOI: 10.1016/j.atherosclerosis.2019.04.210] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 03/30/2019] [Accepted: 04/04/2019] [Indexed: 12/04/2022]
Abstract
A striking feature of atherosclerosis is its highly non-uniform distribution within the arterial tree. This has been attributed to variation in the haemodynamic wall shear stress (WSS) experienced by endothelial cells, but the WSS characteristics that are important and the mechanisms by which they lead to disease remain subjects of intensive investigation despite decades of research. In vivo evidence suggests that multidirectional WSS is highly atherogenic. This possibility is increasingly being studied by culturing endothelial cells in wells that are swirled on an orbital shaker. The method is simple and cost effective, has high throughput and permits chronic exposure, but interpretation of the results can be difficult because the fluid mechanics are complex; hitherto, their description has largely been restricted to the engineering literature. Here we review the findings of such studies, which indicate that putatively atherogenic flow characteristics occur at the centre of the well whilst atheroprotective ones occur towards the edge, and we describe simple mathematical methods for choosing experimental variables that avoid resonance, wave breaking and uncovering of the cells. We additionally summarise a large number of studies showing that endothelium cultured at the centre of the well expresses more pro-inflammatory and fewer homeostatic genes, has higher permeability, proliferation, apoptosis and senescence, and shows more endothelial-to-mesenchymal transition than endothelium at the edge. This simple method, when correctly interpreted, has the potential to greatly increase our understanding of the homeostatic and pathogenic mechanobiology of endothelial cells and may help identify new therapeutic targets in vascular disease.
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Affiliation(s)
| | - Mean Ghim
- Department of Bioengineering, Imperial College London, UK
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Vatankhah E, Prabhakaran MP, Ramakrishna S. Biomimetic microenvironment complexity to redress the balance between biodegradation and de novo matrix synthesis during early phase of vascular tissue engineering. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 81:39-47. [DOI: 10.1016/j.msec.2017.06.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 05/29/2017] [Accepted: 06/28/2017] [Indexed: 01/12/2023]
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Thomas JMD, Chakraborty A, Berson RE, Shakeri M, Sharp MK. Validation of a CFD model of an orbiting culture dish with PIV and analytical solutions. AIChE J 2017. [DOI: 10.1002/aic.15762] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | - Amlan Chakraborty
- Dept. of Chemical EngineeringUniversity of LouisvilleLouisville KY40292
| | - R. Eric Berson
- Dept. of Chemical EngineeringUniversity of LouisvilleLouisville KY40292
| | - Mostafa Shakeri
- Dept. of Mechanical EngineeringUniversity of LouisvilleLouisville KY40292
| | - M. Keith Sharp
- Dept. of Mechanical EngineeringUniversity of LouisvilleLouisville KY40292
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Guo FX, Hu YW, Zheng L, Wang Q. Shear Stress in Autophagy and Its Possible Mechanisms in the Process of Atherosclerosis. DNA Cell Biol 2017; 36:335-346. [PMID: 28287831 DOI: 10.1089/dna.2017.3649] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Autophagy can eliminate harmful components and maintain cellular homeostasis in response to a series of extracellular insults in eukaryotes. More and more studies show that autophagy plays vital roles in the development of atherosclerosis. Atherosclerosis is a multifactorial disease and shear stress acts as a key role in its process. Understanding the role of shear stress in autophagy may offer insight into atherosclerosis therapies, especially emerging targeted therapy. In this article, we retrospect related studies to summarize the present comprehension of the association between autophagy and atherosclerosis onset and progression.
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Affiliation(s)
- Feng-Xia Guo
- Laboratory Medicine Center, Nanfang Hospital, Southern Medical University , Guangzhou, China
| | - Yan-Wei Hu
- Laboratory Medicine Center, Nanfang Hospital, Southern Medical University , Guangzhou, China
| | - Lei Zheng
- Laboratory Medicine Center, Nanfang Hospital, Southern Medical University , Guangzhou, China
| | - Qian Wang
- Laboratory Medicine Center, Nanfang Hospital, Southern Medical University , Guangzhou, China
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Klein B, Destephens A, Dumeny L, Hu Q, He Y, O'Malley K, Jiang Z, Tran-Son-Tay R, Berceli S. Hemodynamic Influence on Smooth Muscle Cell Kinetics and Phenotype During Early Vein Graft Adaptation. Ann Biomed Eng 2016; 45:644-655. [PMID: 27624660 DOI: 10.1007/s10439-016-1725-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Accepted: 09/02/2016] [Indexed: 10/21/2022]
Abstract
Pathologic vascular adaptation following local injury is the primary driver for accelerated intimal hyperplasia and an occlusive phenotype. Smooth muscle cell (SMC) proliferation within the wall, and migration into the developing intima, is a major component of this remodeling response. The primary objective in the current study was to investigate the effect of the local biomechanical forces on early vein graft adaptation, specifically focusing on the spatial and temporal response of SMC proliferation and conversion from a contractile to synthetic architecture. Taking advantage of the differential adaptation that occurs during exposure to divergent flow environments, vein grafts were implanted in rabbits to create two distinct flow environments and harvested at times ranging from 2 h to 28 days. Using an algorithm for the virtual reconstruction of unfixed, histologic specimens, immunohistochemical tracking of DNA synthesis, and high-throughput transcriptional analysis, the spatial and temporal changes in graft morphology, cell proliferation, and SMC phenotype were catalogued. Notable findings include a burst of cell proliferation at 7 days post-implantation, which was significantly augmented by exposure to a reduced flow environment. Compared to the adjacent media, proliferation rates were 3-fold greater in the intima, and a specific spatial distribution of these proliferating cells was identified, with a major peak in the sub-endothelial region and a second peak centering on the internal elastic lamina. Genomic markers of a contractile SMC phenotype were reduced as early as 2 h post-implantation and reached a nadir at 7 days. Network analysis of upstream regulatory pathways identified GATA6 and KLF5 as important transcription factors that regulate this shift in SMC phenotype.
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Affiliation(s)
- Benjamin Klein
- Malcom Randall VA Medical Center, Gainesville, FL, USA.,Department of Surgery, University of Florida, Box 100128, Gainesville, FL, 32610-0128, USA
| | - Anthony Destephens
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA
| | - Leanne Dumeny
- Malcom Randall VA Medical Center, Gainesville, FL, USA.,Department of Surgery, University of Florida, Box 100128, Gainesville, FL, 32610-0128, USA
| | - Qiongyao Hu
- Malcom Randall VA Medical Center, Gainesville, FL, USA.,Department of Surgery, University of Florida, Box 100128, Gainesville, FL, 32610-0128, USA
| | - Yong He
- Malcom Randall VA Medical Center, Gainesville, FL, USA.,Department of Surgery, University of Florida, Box 100128, Gainesville, FL, 32610-0128, USA
| | - Kerri O'Malley
- Malcom Randall VA Medical Center, Gainesville, FL, USA.,Department of Surgery, University of Florida, Box 100128, Gainesville, FL, 32610-0128, USA
| | - Zhihua Jiang
- Malcom Randall VA Medical Center, Gainesville, FL, USA.,Department of Surgery, University of Florida, Box 100128, Gainesville, FL, 32610-0128, USA
| | - Roger Tran-Son-Tay
- Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA.,Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA
| | - Scott Berceli
- Malcom Randall VA Medical Center, Gainesville, FL, USA. .,Department of Surgery, University of Florida, Box 100128, Gainesville, FL, 32610-0128, USA. .,Department of Biomedical Engineering, University of Florida, Gainesville, FL, USA.
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Velasco V, Gruenthal M, Zusstone E, Thomas JMD, Berson RE, Keynton RS, Williams SJ. An orbital shear platform for real-time, in vitro endothelium characterization. Biotechnol Bioeng 2016; 113:1336-44. [PMID: 26615057 DOI: 10.1002/bit.25893] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2015] [Revised: 10/29/2015] [Accepted: 11/24/2015] [Indexed: 01/13/2023]
Abstract
Electrical impedance techniques have been used to characterize endothelium morphology, permeability, and motility in vitro. However, these impedance platforms have been limited to either static endothelium studies and/or induced laminar fluid flow at a constant, single shear stress value. In this work, we present a microfabricated impedance sensor for real-time, in vitro characterization of human umbilical vein endothelial cells (HUVECs) undergoing oscillatory hydrodynamic shear. Oscillatory shear was applied with an orbital shaker and the electrical impedance was measured by a microfabricated impedance chip with discrete electrodes positioned at radial locations of 0, 2.5, 5.0, 7.5, 10.0, and 12.5 mm from the center of the chip. Depending on their radial position within the circular orbital platform, HUVECs were exposed to shear values ranging between 0.6 and 6.71 dyne/cm(2) (according to numerical simulations) for 22 h. Impedance spectra were fit to an equivalent circuit model and the trans-endothelial resistance and monolayer's capacitance were extracted. Results demonstrated that, compared to measurements acquired before the onset of shear, cells at the center of the platform that experienced low steady shear stress (∼2.2 dyne/cm(2) ) had an average change in trans-endothelial resistance of 6.99 ± 4.06% and 1.78 ± 2.40% change in cell capacitance after 22 hours of shear exposure; cells near the periphery of the well (r = 12.5 mm) experienced transient shears (2.5-6.7 dyne/cm(2) ) and exhibited a greater change in trans-endothelial resistance (24.2 ± 10.8%) and cell capacitance (4.57 ± 5.39%). This study, demonstrates that the orbital shear platform provides a simple system that can capture and quantify the real-time cellular morphology as a result of induced shear stress. The orbital shear platform presented in this work, compared to traditional laminar platforms, subjects cells to more physiologically relevant oscillatory shear as well as exposes the sample to several shear values simultaneously. Biotechnol. Bioeng. 2016;113: 1336-1344. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Vanessa Velasco
- Department of Mechanical Engineering, University of Louisville, Louisville, 40292, Kentucky
| | - Mark Gruenthal
- Department of Mechanical Engineering, University of Louisville, Louisville, 40292, Kentucky
| | - Esther Zusstone
- School of Nursing, University of Louisville, Louisville, Kentucky
| | - Jonathan M D Thomas
- Department of Chemical Engineering, University of Louisville, Louisville, Kentucky
| | - R Eric Berson
- Department of Chemical Engineering, University of Louisville, Louisville, Kentucky
| | - Robert S Keynton
- Department of Bioengineering, University of Louisville, Louisville, Kentucky
| | - Stuart J Williams
- Department of Mechanical Engineering, University of Louisville, Louisville, 40292, Kentucky.
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Kim H, Yang KH, Cho H, Gwak G, Park SC, Kim JI, Yun SS, Moon IS. Different Effects of Orbital Shear Stress on Vascular Endothelial Cells: Comparison with the Results of In Vivo Study with Rats. Vasc Specialist Int 2015. [PMID: 26217642 PMCID: PMC4508651 DOI: 10.5758/vsi.2015.31.2.33] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Purpose: An attempt was made to characterize the orbital shear stress by comparing the effects of orbital shear stress on vascular endothelial cells (ECs) with the results of animal experiments. Materials and Methods: In the laboratory study, cultured ECs of well were distinguished by center and periphery then exposed to orbital shear stress using an orbital shaker. In the animal study, arteriovenous (AV) fistulas were made at the right femoral arteries of Sprague-Dawley rats to increase the effect of the laminar flow. The condition of the stenosis was given on the left femoral arteries. The protein expression of inducible nitric oxide synthase (iNOS) and Akt phosphorylation were observed and compared. Results: Under orbital shear stress, ECs showed an increase in iNOS protein expression and phosphorylation of Akt but most of the protein expressions derived from the periphery. When compared to the animal study, the increased expression of iNOS protein and phosphorylation of Akt were observed in the sample of AV fistula conditions and the iNOS protein expression was decreased in the stenosis conditions. Conclusion: Orbital shear stress did not show the characteristics of a pure turbulent shear force. By comparing the observation with the morphological changes of vascular ECs and site-specific protein expression on the results of animal experiments, uniform directional lamina shear stress forces were expressed at the periphery.
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Affiliation(s)
- Hyosoo Kim
- Department of Surgery, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Keun Ho Yang
- Department of Surgery, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Hyunjin Cho
- Department of Surgery, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Geumhee Gwak
- Department of Surgery, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Korea
| | - Sun Cheol Park
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Ji Il Kim
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Sang Seob Yun
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - In Sung Moon
- Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Chistiakov DA, Orekhov AN, Bobryshev YV. Vascular smooth muscle cell in atherosclerosis. Acta Physiol (Oxf) 2015; 214:33-50. [PMID: 25677529 DOI: 10.1111/apha.12466] [Citation(s) in RCA: 290] [Impact Index Per Article: 32.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 02/02/2015] [Accepted: 02/09/2015] [Indexed: 12/30/2022]
Abstract
Vascular smooth muscle cells (VSMCs) exhibit phenotypic and functional plasticity in order to respond to vascular injury. In case of the vessel damage, VSMCs are able to switch from the quiescent 'contractile' phenotype to the 'proinflammatory' phenotype. This change is accompanied by decrease in expression of smooth muscle (SM)-specific markers responsible for SM contraction and production of proinflammatory mediators that modulate induction of proliferation and chemotaxis. Indeed, activated VSMCs could efficiently proliferate and migrate contributing to the vascular wall repair. However, in chronic inflammation that occurs in atherosclerosis, arterial VSMCs become aberrantly regulated and this leads to increased VSMC dedifferentiation and extracellular matrix formation in plaque areas. Proatherosclerotic switch in VSMC phenotype is a complex and multistep mechanism that may be induced by a variety of proinflammatory stimuli and hemodynamic alterations. Disturbances in hemodynamic forces could initiate the proinflammatory switch in VSMC phenotype even in pre-clinical stages of atherosclerosis. Proinflammatory signals play a crucial role in further dedifferentiation of VSMCs in affected vessels and propagation of pathological vascular remodelling.
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Affiliation(s)
- D. A. Chistiakov
- Research Center for Children's Health; Moscow Russia
- The Mount Sinai Community Clinical Oncology Program; Mount Sinai Comprehensive Cancer Center; Mount Sinai Medical Center; Miami Beach FL USA
| | - A. N. Orekhov
- Institute for Atherosclerosis; Skolkovo Innovative Center; Moscow Russia
- Laboratory of Angiopathology; Institute of General Pathology and Pathophysiology; Russian Academy of Sciences; Moscow Russia
- Department of Biophysics; Biological Faculty; Moscow State University; Moscow Russia
| | - Y. V. Bobryshev
- Institute for Atherosclerosis; Skolkovo Innovative Center; Moscow Russia
- Faculty of Medicine; School of Medical Sciences; University of New South Wales; Kensington Sydney NSW Australia
- School of Medicine; University of Western Sydney; Campbelltown NSW Australia
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Aryaei A, Jayasuriya AC. The effect of oscillatory mechanical stimulation on osteoblast attachment and proliferation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 52:129-34. [PMID: 25953549 DOI: 10.1016/j.msec.2015.03.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Revised: 02/26/2015] [Accepted: 03/20/2015] [Indexed: 10/23/2022]
Abstract
The aim of this paper is to investigate the effect of the magnitude and duration of oscillatory mechanical stimulation on osteoblast attachment and proliferation as well as the time gap between seeding and applying the stimulation. Cells were exposed to three levels of speed at two different conditions. For the first group, mechanical shear stress was applied after 20 min of cell seeding. For the second group there was no time gap between cell seeding and applying mechanical stimulation. The total area subjected to shear stress was divided into three parts and for each part a comparative study was conducted at defined time points. Our results showed that both shear stress magnitude and the time gap between cell seeding and applying shear stress, are important in further cell proliferation and attachment. The effect of shear stress was not significant at lower speeds for both groups at earlier time points. However, a higher percentage of area was covered by cells at later time points under shear stress. In addition, the time gap can also improve osteoblast attachment. For the best rate of cell attachment and proliferation, the magnitude of shear stress and time gap should be optimized. The results of this paper can be utilized to improve cell attachment and proliferation in bioreactors.
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Affiliation(s)
- Ashkan Aryaei
- Department of Mechanical Engineering, College of Engineering, University of Toledo, Toledo, OH 43606, USA
| | - Ambalangodage C Jayasuriya
- Department of Orthopaedic Surgery, College of Medicine and Life Sciences, University of Toledo, Toledo, OH 43614, USA.
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Tarbell JM, Shi ZD, Dunn J, Jo H. Fluid Mechanics, Arterial Disease, and Gene Expression. ANNUAL REVIEW OF FLUID MECHANICS 2014; 46:591-614. [PMID: 25360054 PMCID: PMC4211638 DOI: 10.1146/annurev-fluid-010313-141309] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
This review places modern research developments in vascular mechanobiology in the context of hemodynamic phenomena in the cardiovascular system and the discrete localization of vascular disease. The modern origins of this field are traced, beginning in the 1960s when associations between flow characteristics, particularly blood flow-induced wall shear stress, and the localization of atherosclerotic plaques were uncovered, and continuing to fluid shear stress effects on the vascular lining endothelial) cells (ECs), including their effects on EC morphology, biochemical production, and gene expression. The earliest single-gene studies and genome-wide analyses are considered. The final section moves from the ECs lining the vessel wall to the smooth muscle cells and fibroblasts within the wall that are fluid me chanically activated by interstitial flow that imposes shear stresses on their surfaces comparable with those of flowing blood on EC surfaces. Interstitial flow stimulates biochemical production and gene expression, much like blood flow on ECs.
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Affiliation(s)
- John M Tarbell
- Department of Biomedical Engineering, The City College of New York, New York, NY 10031
| | - Zhong-Dong Shi
- Developmental Biology Program, Sloan-Kettering Institute, New York, NY 10065
| | - Jessilyn Dunn
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30322
| | - Hanjoong Jo
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30322
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Qiu J, Zheng Y, Hu J, Liao D, Gregersen H, Deng X, Fan Y, Wang G. Biomechanical regulation of vascular smooth muscle cell functions: from in vitro to in vivo understanding. J R Soc Interface 2013; 11:20130852. [PMID: 24152813 DOI: 10.1098/rsif.2013.0852] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Vascular smooth muscle cells (VSMCs) have critical functions in vascular diseases. Haemodynamic factors are important regulators of VSMC functions in vascular pathophysiology. VSMCs are physiologically active in the three-dimensional matrix and interact with the shear stress sensor of endothelial cells (ECs). The purpose of this review is to illustrate how haemodynamic factors regulate VSMC functions under two-dimensional conditions in vitro or three-dimensional co-culture conditions in vivo. Recent advances show that high shear stress induces VSMC apoptosis through endothelial-released nitric oxide and low shear stress upregulates VSMC proliferation and migration through platelet-derived growth factor released by ECs. This differential regulation emphasizes the need to construct more actual environments for future research on vascular diseases (such as atherosclerosis and hypertension) and cardiovascular tissue engineering.
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Affiliation(s)
- Juhui Qiu
- Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Chongqing Engineering Laboratory in Vascular Implants, College of Bioengineering, Chongqing University, , Chongqing 400044, People's Republic of China
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Seneviratne A, Hulsmans M, Holvoet P, Monaco C. Biomechanical factors and macrophages in plaque stability. Cardiovasc Res 2013; 99:284-93. [DOI: 10.1093/cvr/cvt097] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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Involvement of large conductance Ca2+-activated K+ channel in laminar shear stress-induced inhibition of vascular smooth muscle cell proliferation. Pflugers Arch 2012. [DOI: 10.1007/s00424-012-1182-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Extracellular matrix and the mechanics of large artery development. Biomech Model Mechanobiol 2012; 11:1169-86. [PMID: 22584609 DOI: 10.1007/s10237-012-0405-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 05/02/2012] [Indexed: 10/28/2022]
Abstract
The large, elastic arteries, as their name suggests, provide elastic distention and recoil during the cardiac cycle in vertebrate animals. The arteries are distended from the pressure of ejecting blood during the active contraction of the left ventricle (LV) during systole and recoil to their original dimensions during relaxation of the LV during diastole. The cyclic distension occurs with minimal energy loss, due to the elastic properties of one of the major structural extracellular matrix (ECM) components, elastin. The maximum distension is limited to prevent damage to the artery by another major ECM component, collagen. The mix of ECM components in the wall largely determines the passive mechanical behavior of the arteries and the subsequent load on the heart during systole. While much research has focused on initial artery formation, there has been less attention on the continuing development of the artery to produce the mature composite wall complete with endothelial cells (ECs), smooth muscle cells (SMCs), and the necessary mix of ECM components for proper cardiovascular function. This review focuses on the physiology of large artery development, including SMC differentiation and ECM production. The effects of hemodynamic forces and ECM deposition on the evolving arterial structure and function are discussed. Human diseases and mouse models with genetic mutations in ECM proteins that affect large artery development are summarized. A review of constitutive models and growth and remodeling theories is presented, along with future directions to improve understanding of ECM and the mechanics of large artery development.
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Wu T, Chen L, Wei T, Wang Y, Xu F, Wang K. Effect of cyclic hydrodynamic pressure-induced proliferation of human bladder smooth muscle through Ras-related C3 botulinum toxin substrate 1, mitogen-activated protein kinase kinase 1/2 and extracellular regulated protein kinases 1/2. Int J Urol 2012; 19:867-74. [PMID: 22574733 DOI: 10.1111/j.1442-2042.2012.03043.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVES To examine the role of Ras-related C3 botulinum toxin substrate 1, mitogen-activated protein kinase kinase 1/2 and extracellular regulated protein kinases 1/2 in the cyclic hydrodynamic pressure-induced proliferation of human bladder smooth muscle cells. METHODS Human bladder smooth muscle cells were exposed to cyclic hydrodynamic pressures in vitro with defined parameters (static, 100 cmH(2) O, 200 cmH(2) O and 300 cmH(2) O pressure) for 24 h. The proliferation of cells was assessed by flow cytometry. Ras-related C3 botulinum toxin substrate 1, mitogen-activated protein kinase kinase 1/2 and extracellular regulated protein kinases 1/2 messenger ribonucleic acid, and protein expression was analyzed by real-time polymerase chain reaction and Western blot. Specificity of the Rac1 was determined with real-time polymerase chain reaction and Western blot technique with small interfering ribonucleic acid transfection and Rac1 inhibitor (NSC23766). RESULTS The proliferation of human bladder smooth muscle cells was increased. Ras-related C3 botulinum toxin substrate 1, mitogen-activated protein kinase kinase 1/2 and extracellular regulated protein kinases 1/2 were activated by 200 and 300 cmH(2) O cyclic hydrodynamic pressure compared with static and 100 cmH(2) O pressure. The "knockdown" of activation of Rac1 using target small interfering ribonucleic acid transfection and Rac1 inhibitor (NSC23766) decreased proliferation of human bladder smooth muscle cells, and downregulated mitogen-activated protein kinase kinase 1/2, extracellular regulated protein kinases 1/2. CONCLUSION The Rac1 pathway is activated in mechanotransduction and regulation of human bladder smooth muscle cell proliferation in response to cyclic hydrodynamic pressure.
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Affiliation(s)
- Tao Wu
- Department of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
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ten Freyhaus H, Dumitrescu D, Berghausen E, Vantler M, Caglayan E, Rosenkranz S. Imatinib mesylate for the treatment of pulmonary arterial hypertension. Expert Opin Investig Drugs 2011; 21:119-34. [PMID: 22074410 DOI: 10.1517/13543784.2012.632408] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Despite recent advances, pulmonary arterial hypertension (PAH) remains a devastating disease which harbors a poor prognosis. Novel therapeutic approaches directly targeting pulmonary vascular remodeling are warranted. AREAS COVERED This review delineates the current limitations in the management of PAH and focuses on a novel, anti-proliferative therapeutic concept. It will help readers understand the mechanisms of receptor tyrosine kinase signaling, with a special focus on platelet-derived growth factor (PDGF) receptors and their role in the pathobiology of PAH. Furthermore, it provides a comprehensive summary regarding the rationale, efficacy and safety of the tyrosine kinase inhibitor imatinib mesylate , which potently inhibits the PDGF receptor, as an additional treatment option in PAH. EXPERT OPINION PDGF is a potent mitogen for pulmonary vascular smooth muscle cells and represents an important mediator of pulmonary vascular remodeling. Imatinib mesylate, a compound that inhibits the Bcr-Abl kinase and was developed for the treatment of chronic myeloid leukemia, also targets PDGF receptors. Both experimental and clinical data indicate that it reverses the vascular remodeling process even when it is fully established. Results from Phase II and III clinical trials suggest potent and prolonged efficacy in patients with severe PAH (i.e., pulmonary vascular resistance > 800 dynes*s*cm(-5)). Future studies should evaluate the long-term clinical efficacy and safety of imatinib, including patients with less impaired hemodynamics. Based on the current knowledge, this compound is likely to become an additional treatment option for patients with PAH and has the potential to at least partially correct the pathology of the disease.
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Affiliation(s)
- Henrik ten Freyhaus
- Klinik III für Innere Medizin, Center for Molecular Medicine Cologne, Universität zu Köln, Kerpener Str. 62, 50924 Köln, Germany
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Chakraborty A, Chakraborty S, Jala VR, Haribabu B, Sharp MK, Berson RE. Effects of biaxial oscillatory shear stress on endothelial cell proliferation and morphology. Biotechnol Bioeng 2011; 109:695-707. [PMID: 22012789 DOI: 10.1002/bit.24352] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2010] [Revised: 10/04/2011] [Accepted: 10/10/2011] [Indexed: 01/31/2023]
Abstract
Wall shear stress (WSS) on anchored cells affects their responses, including cell proliferation and morphology. In this study, the effects of the directionality of pulsatile WSS on endothelial cell proliferation and morphology were investigated for cells grown in a Petri dish orbiting on a shaker platform. Time and location dependent WSS was determined by computational fluid dynamics (CFD). At low orbital speed (50 rpm), WSS was shown to be uniform (0-1 dyne/cm(2)) across the bottom of the dish, while at higher orbital speed (100 and 150 rpm), WSS remained fairly uniform near the center and fluctuated significantly (0-9 dyne/cm(2)) near the side walls of the dish. Since WSS on the bottom of the dish is two-dimensional, a new directional oscillatory shear index (DOSI) was developed to quantify the directionality of oscillating shear. DOSI approached zero for biaxial oscillatory shear of equal magnitudes near the center and approached one for uniaxial pulsatile shear near the wall, where large tangential WSS dominated a much smaller radial component. Near the center (low DOSI), more, smaller and less elongated cells grew, whereas larger cells with greater elongation were observed in the more uniaxial oscillatory shear (high DOSI) near the periphery of the dish. Further, cells aligned with the direction of the largest component of shear but were randomly oriented in low magnitude biaxial shear. Statistical analyses of the individual and interacting effects of multiple factors (DOSI, shear magnitudes and orbital speeds) showed that DOSI significantly affected all the responses, indicating that directionality is an important determinant of cellular responses.
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Affiliation(s)
- Amlan Chakraborty
- Department of Chemical Engineering, Earnst Hall 106, University of Louisville, Louisville, Kentucky 40292, USA
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Analysis of Fluid Flow and Wall Shear Stress Patterns Inside Partially Filled Agitated Culture Well Plates. Ann Biomed Eng 2011; 40:707-28. [DOI: 10.1007/s10439-011-0444-9] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2011] [Accepted: 10/10/2011] [Indexed: 11/26/2022]
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Chan DD, Van Dyke WS, Bahls M, Connell SD, Critser P, Kelleher JE, Kramer MA, Pearce SM, Sharma S, Neu CP. Mechanostasis in apoptosis and medicine. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2011; 106:517-24. [PMID: 21846479 DOI: 10.1016/j.pbiomolbio.2011.08.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2011] [Accepted: 08/02/2011] [Indexed: 10/17/2022]
Abstract
Mechanostasis describes a complex and dynamic process where cells maintain equilibrium in response to mechanical forces. Normal physiological loading modes and magnitudes contribute to cell proliferation, tissue growth, differentiation and development. However, cell responses to abnormal forces include compensatory apoptotic mechanisms that may contribute to the development of tissue disease and pathological conditions. Mechanotransduction mechanisms tightly regulate the cell response through discrete signaling pathways. Here, we provide an overview of links between pro- and anti-apoptotic signaling and mechanotransduction signaling pathways, and identify potential clinical applications for treatments of disease by exploiting mechanically-linked apoptotic pathways.
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Affiliation(s)
- D D Chan
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907, USA
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Kim DH, Heo SJ, Kim SH, Shin JW, Park SH, Shin JW. Shear stress magnitude is critical in regulating the differentiation of mesenchymal stem cells even with endothelial growth medium. Biotechnol Lett 2011; 33:2351-9. [DOI: 10.1007/s10529-011-0706-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Accepted: 07/12/2011] [Indexed: 01/10/2023]
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Fluid flow mechanotransduction in vascular smooth muscle cells and fibroblasts. Ann Biomed Eng 2011; 39:1608-19. [PMID: 21479754 DOI: 10.1007/s10439-011-0309-2] [Citation(s) in RCA: 164] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 04/04/2011] [Indexed: 12/29/2022]
Abstract
Understanding how vascular wall endothelial cells (ECs), smooth muscle cells (SMCs), and fibroblasts (FBs) sense and transduce the stimuli of hemodynamic forces (shear stress, cyclic strain, and hydrostatic pressure) into intracellular biochemical signals is critical to prevent vascular disease development and progression. ECs lining the vessel lumen directly sense alterations in blood flow shear stress and then communicate with medial SMCs and adventitial FBs to regulate vessel function and disease. Shear stress mechanotransduction in ECs has been extensively studied and reviewed. In the case of endothelial damage, blood flow shear stress may directly act on the superficial layer of SMCs and transmural interstitial flow may be elevated on medial SMCs and adventitial FBs. Therefore, it is also important to investigate direct shear effects on vascular SMCs as well as FBs. The work published in the last two decades has shown that shear stress and interstitial flow have significant influences on vascular SMCs and FBs. This review summarizes work that considered direct shear effects on SMCs and FBs and provides the first comprehensive overview of the underlying mechanisms that modulate SMC secretion, alignment, contraction, proliferation, apoptosis, differentiation, and migration in response to 2-dimensional (2D) laminar, pulsatile, and oscillating flow shear stresses and 3D interstitial flow. A mechanistic model of flow sensing by SMCs is also provided to elucidate possible mechanotransduction pathways through surface glycocalyx, integrins, membrane receptors, ion channels, and primary cilia. Understanding flow-mediated mechanotransduction in SMCs and FBs and the interplay with ECs should be helpful in exploring strategies to prevent flow-initiated atherosclerosis and neointima formation and has implications in vascular tissue engineering.
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Newcomer SC, Thijssen DHJ, Green DJ. Effects of exercise on endothelium and endothelium/smooth muscle cross talk: role of exercise-induced hemodynamics. J Appl Physiol (1985) 2011; 111:311-20. [PMID: 21436465 DOI: 10.1152/japplphysiol.00033.2011] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Physical activity, exercise training, and fitness are associated with decreased cardiovascular risk. In the context that a risk factor "gap" exists in the explanation for the beneficial effects of exercise on cardiovascular disease, it has recently been proposed that exercise generates hemodynamic stimuli which exert direct effects on the vasculature that are antiatherogenic. In this review we briefly introduce some of the in vitro and in vivo evidence relating exercise hemodynamic modulation and vascular adaptation. In vitro data clearly demonstrate the importance of shear stress as a potential mechanism underlying vascular adaptations associated with exercise. Supporting this is in vivo human data demonstrating that exercise-mediated shear stress induces localized impacts on arterial function and diameter. Emerging evidence suggests that exercise-related changes in hemodynamic stimuli other than shear stress may also be associated with arterial remodeling. Taken together, in vitro and in vivo data strongly imply that hemodynamic influences combine to orchestrate a response to exercise and training that regulates wall stress and peripheral vascular resistance and contributes to the antiatherogenic impacts of physical activity, fitness, and training.
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Affiliation(s)
- S C Newcomer
- Department of Health and Kinesiology, Purdue University, West Lafayette, IN 47907, USA.
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Rochier A, Nixon A, Yamashita N, Abe R, Abe R, Madri JA, Sumpio BE. Laminar shear, but not orbital shear, has a synergistic effect with thrombin stimulation on tissue factor expression in human umbilical vein endothelial cells. J Vasc Surg 2011; 54:480-8. [PMID: 21367569 DOI: 10.1016/j.jvs.2011.01.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Revised: 12/27/2010] [Accepted: 01/06/2011] [Indexed: 11/26/2022]
Abstract
INTRODUCTION High levels of tissue factor (TF) have been associated with atherosclerotic plaques. The specific pathways linked to TF expression in endothelial cells (ECs) have not been well defined. This study compared TF expression in human umbilical vein ECs (HUVECs) exposed to laminar shear stress (LSS) using a parallel flow chamber and to orbital shear stress (OSS) using an orbital shaker. We also compared the effects of thrombin (TH) stimulation of ECs exposed to different shear forces on the expression of TF and investigated the role that second messengers, p38 and extracellular signal-regulated kinase 1 and 2 (ERK1/2), had in the EC response. METHODS HUVECs were subjected to 2, 4, or 6 hours of LSS or OSS in the presence or absence of 4 U/mL of TH. Western blot analysis of ERK1/2 and p38 activation and polymerase chain reaction analysis of TF in the presence of inhibitors to these second messengers was performed in HUVECs subjected to OSS or LSS in the presence or absence of TH. RESULTS TF expression was increased and peaked at 2 hours in all HUVECs exposed to LSS or TH. Stimulation of static HUVECs with TH resulted in an increase in TF expression of 5.68 ± 1.58-, 3.80 ± 1.21-, and 2.54 ± 0.38-fold at 2, 4, and 6 hours, respectively (n = 6 experiments). In the absence of TH, HUVECs exposed to LSS demonstrated a 9.51 ± 0.62-, 7.31 ± 1.43-, and 4.39 ± 1.32-fold increase in TF expression at 2, 4, and 6 hours, respectively (n = 6 experiments). TF was increased significantly more when exposed to LSS in the presence of TH (18.85 ± 1.43-, 15.05 ± 0.95-, and 8.91 ± 1.06-fold increases at 2, 4, and 6 hours, respectively [n = 6 experiments], P < .01). Between-group analysis showed a significant difference between groups (P < .001). OSS did not significantly increase TF expression in the presence or absence of TH. ERK1/2 and p38 activation was increased in LSS and LSS + TH but not in OSS or OSS + TH (n = 3 experiments). CONCLUSION LSS and TH independently increased TF expression, but OSS did not. LSS + TH stimulation showed a synergistic effect, which suggests that these mechanical and chemical stimuli work through different pathways or that an intracellular interaction between TH and LSS may be present that does not occur in OSS.
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Affiliation(s)
- Adrienne Rochier
- Department of Vascular Surgery, Yale University School of Medicine, New Haven, CT, USA
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Thomas JMD, Chakraborty A, Sharp MK, Berson RE. Spatial and temporal resolution of shear in an orbiting petri dish. Biotechnol Prog 2011; 27:460-5. [DOI: 10.1002/btpr.507] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2009] [Revised: 07/09/2010] [Indexed: 11/08/2022]
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Shi ZD, Abraham G, Tarbell JM. Shear stress modulation of smooth muscle cell marker genes in 2-D and 3-D depends on mechanotransduction by heparan sulfate proteoglycans and ERK1/2. PLoS One 2010; 5:e12196. [PMID: 20808940 PMCID: PMC2922372 DOI: 10.1371/journal.pone.0012196] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2010] [Accepted: 07/25/2010] [Indexed: 01/31/2023] Open
Abstract
Background During vascular injury, vascular smooth muscle cells (SMCs) and fibroblasts/myofibroblasts (FBs/MFBs) are exposed to altered luminal blood flow or transmural interstitial flow. We investigate the effects of these two types of fluid flows on the phenotypes of SMCs and MFBs and the underlying mechanotransduction mechanisms. Methodology/Principal Findings Exposure to 8 dyn/cm2 laminar flow shear stress (2-dimensional, 2-D) for 15 h significantly reduced expression of α-smooth muscle actin (α-SMA), smooth muscle protein 22 (SM22), SM myosin heavy chain (SM-MHC), smoothelin, and calponin. Cells suspended in collagen gels were exposed to interstitial flow (1 cmH2O, ∼0.05 dyn/cm2, 3-D), and after 6 h of exposure, expression of SM-MHC, smoothelin, and calponin were significantly reduced, while expression of α-SMA and SM22 were markedly enhanced. PD98059 (an ERK1/2 inhibitor) and heparinase III (an enzyme to cleave heparan sulfate) significantly blocked the effects of laminar flow on gene expression, and also reversed the effects of interstitial flow on SM-MHC, smoothelin, and calponin, but enhanced interstitial flow-induced expression of α-SMA and SM22. SMCs and MFBs have similar responses to fluid flow. Silencing ERK1/2 completely blocked the effects of both laminar flow and interstitial flow on SMC marker gene expression. Western blotting showed that both types of flows induced ERK1/2 activation that was inhibited by disruption of heparan sulfate proteoglycans (HSPGs). Conclusions/Significance The results suggest that HSPG-mediated ERK1/2 activation is an important mechanotransduction pathway modulating SMC marker gene expression when SMCs and MFBs are exposed to flow. Fluid flow may be involved in vascular remodeling and lesion formation by affecting phenotypes of vascular wall cells. This study has implications in understanding the flow-related mechanobiology in vascular lesion formation, tumor cell invasion, and stem cell differentiation.
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Affiliation(s)
- Zhong-Dong Shi
- Department of Biomedical Engineering, The City College of New York, The City University of New York (CUNY), New York, New York, United States of America
- * E-mail: (ZDS); (JMT)
| | - Giya Abraham
- Department of Biomedical Engineering, The City College of New York, The City University of New York (CUNY), New York, New York, United States of America
| | - John M. Tarbell
- Department of Biomedical Engineering, The City College of New York, The City University of New York (CUNY), New York, New York, United States of America
- * E-mail: (ZDS); (JMT)
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Lam H, Brink P, Qin YX. Skeletal nutrient vascular adaptation induced by external oscillatory intramedullary fluid pressure intervention. J Orthop Surg Res 2010; 5:18. [PMID: 20222973 PMCID: PMC2845561 DOI: 10.1186/1749-799x-5-18] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2009] [Accepted: 03/11/2010] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Interstitial fluid flow induced by loading has demonstrated to be an important mediator for regulating bone mass and morphology. It is shown that the fluid movement generated by the intramedullary pressure (ImP) provides a source for pressure gradient in bone. Such dynamic ImP may alter the blood flow within nutrient vessel adjacent to bone and directly connected to the marrow cavity, further initiating nutrient vessel adaptation. It is hypothesized that oscillatory ImP can mediate the blood flow in the skeletal nutrient vessels and trigger vasculature remodeling. The objective of this study was then to evaluate the vasculature remodeling induced by dynamic ImP stimulation as a function of ImP frequency. METHODS Using an avian model, dynamics physiological fluid ImP (70 mmHg, peak-peak) was applied in the marrow cavity of the left ulna at either 3 Hz or 30 Hz, 10 minutes/day, 5 days/week for 3 or 4 weeks. The histomorphometric measurements of the principal nutrient arteries were done to quantify the arterial wall area, lumen area, wall thickness, and smooth muscle cell layer numbers for comparison. RESULTS The preliminary results indicated that the acute cyclic ImP stimuli can significantly enlarge the nutrient arterial wall area up to 50%, wall thickness up to 20%, and smooth muscle cell layer numbers up to 37%. In addition, 3-week of acute stimulation was sufficient to alter the arterial structural properties, i.e., increase of arterial wall area, whereas 4-week of loading showed only minimal changes regardless of the loading frequency. CONCLUSIONS These data indicate a potential mechanism in the interrelationship between vasculature adaptation and applied ImP alteration. Acute ImP could possibly initiate the remodeling in the bone nutrient vasculature, which may ultimately alter blood supply to bone.
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Affiliation(s)
- Hoyan Lam
- Department of Biomedical Engineering, Stony Brook University, Bioengineering Building Stony Brook, NY 11794, USA
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Shear stress activates Akt during vascular smooth muscle cell reorientation. Biotechnol Appl Biochem 2010; 55:85-90. [PMID: 20055757 DOI: 10.1042/ba20090258] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Vascular intervention procedures can lead to endothelial damage and expose the underlying VSMCs (vascular smooth muscle cells) to shear stress. Although shear stress has been implicated in the proliferation and migration of VSMCs, the molecular mechanism(s) underlying these events are not well understood. In the present study, we examined the effect of shear stress on VSMC reorientation and the activation of Akt (also called protein kinase B) pathway signalling. Cells were subjected to a shear of 9.8 dynes/cm2 (1 dyne=10-5 N) for 0 min, 5 min, 15 min, 30 min, 1 h, 4 h and 24 h. Shear stress caused the VSMCs to realign at an angle that was approximately 45 degrees relative to the shear force vector after 24 h. Immunoblotting demonstrated that the phosphorylations of Akt and Akt-related signalling proteins [mTOR (mammalian target of rapamycin), PTEN (phosphatase and tensin homologue deleted on chromosome 10) and p70S6k (p70 S6-kinase)] were increased after shear stimulation. These results indicate that the activation of the Akt pathway signalling is closely correlated with shear-induced VSMC reorientation.
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Keung AJ, Healy KE, Kumar S, Schaffer DV. Biophysics and dynamics of natural and engineered stem cell microenvironments. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2010; 2:49-64. [DOI: 10.1002/wsbm.46] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Albert J. Keung
- Department of Chemical Engineering, University of California, Berkeley, CA, USA
| | - Kevin E. Healy
- Department of Bioengineering, Department of Materials Science and Engineering, University of California, Berkeley, CA, USA
| | - Sanjay Kumar
- Department of Bioengineering, University of California, Berkeley, CA, USA
| | - David V. Schaffer
- Department of Chemical Engineering, Department of Bioengineering, The Helen Wills Neuroscience Institute, University of California, Berkeley, CA, USA
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Increased synthetic phenotype behavior of smooth muscle cells in response to in vitro balloon angioplasty injury model. Ann Vasc Surg 2009; 24:116-26. [PMID: 19781909 DOI: 10.1016/j.avsg.2009.07.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 06/17/2009] [Accepted: 07/12/2009] [Indexed: 11/20/2022]
Abstract
Restenosis remains a common problem following balloon angioplasty, and it has been speculated that changes in the mechanical environment due to endovascular interventions are correlated with shifts in smooth muscle cell (SMC) phenotype. In order to study SMC response to forces similar to those exerted during balloon angioplasty, an in vitro concurrent shear and tensile forces simulator has been developed. After 24 hr of exposure to cyclic tension (5%) and shear (0.1-0.5 dynes/cm(2)) following simulated angioplasty injury (12% stretch), rat aortic SMCs exhibited significant synthetic behavior. These responses included increased cell proliferation, apoptosis, and cell hypertrophy compared to cells exposed to strain alone. While all SMCs exposed to dynamic stimuli (strain, strain+balloon injury, strain+balloon injury+shear) demonstrated a decrease in contractile protein expression, the injury group also exhibited significantly greater expression of the synthetic marker vimentin. These in vitro findings agree with in vivo events following balloon angioplasty and present a refined dynamic model to be implemented for better understanding of SMC activation and prevention of responses through pharmacological treatment.
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Berson RE, Purcell MR, Sharp MK. Computationally Determined Shear on Cells Grown in Orbiting Culture Dishes. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2008; 614:189-98. [DOI: 10.1007/978-0-387-74911-2_22] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Fitzgerald TN, Shepherd BR, Asada H, Teso D, Muto A, Fancher T, Pimiento JM, Maloney SP, Dardik A. Laminar shear stress stimulates vascular smooth muscle cell apoptosis via the Akt pathway. J Cell Physiol 2008; 216:389-95. [DOI: 10.1002/jcp.21404] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Wang H, Yan S, Chai H, Riha GM, Li M, Yao Q, Chen C. Shear stress induces endothelial transdifferentiation from mouse smooth muscle cells. Biochem Biophys Res Commun 2006; 346:860-5. [PMID: 16793021 DOI: 10.1016/j.bbrc.2006.05.196] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2006] [Accepted: 05/30/2006] [Indexed: 10/24/2022]
Abstract
Smooth muscle cells (SMCs) under shear stress may alter their gene expression patterns to adapt to a new hemodynamic environment. Their plasticity may play an important role in vascular development, healing, and remodeling as well as vascular lesion formation under abnormal environmental conditions. A mouse vascular SMC line (P53LMACO1) cultured under shear stress significantly increased the mRNA levels of endothelial cell markers including Platelet-endothelial cell adhesion molecule-1 (PECAM-1), von Willebrand factor (vWF), and VE-cadherin, while significantly decreasing the mRNA levels of SMC markers including alpha-smooth muscle actin (alpha-SMA), calponin-1, smooth muscle myosin heavy chain (SMMHC), and transgelin as compared to static control cells. Protein levels of PECAM-1 and vWF were significantly increased, while protein levels of alpha-SMA were substantially decreased in the shear stress-cultured cells. In addition, shear stress-cultured cells showed an enhanced capability to form capillary-like structures on Matrigel. Thus, shear stress may promote endothelial cell transdifferentiation from SMCs.
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Affiliation(s)
- Hao Wang
- Molecular Surgeon Research Center, Division of Vascular Surgery and Endovascular Therapy, Michael E. DeBakey Department of Surgery, Baylor College of Medicine, Houston, Texas, USA
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Nishimura K, Li W, Hoshino Y, Kadohama T, Asada H, Ohgi S, Sumpio BE. Role of AKT in cyclic strain-induced endothelial cell proliferation and survival. Am J Physiol Cell Physiol 2006; 290:C812-21. [PMID: 16469863 DOI: 10.1152/ajpcell.00347.2005] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Endothelial cells (ECs) are exposed to repetitive cyclic strain (CS) in vivo by the beating heart. The aim of this study was to assess the influence of CS amplitude and/or frequency on EC proliferation and survival and to determine the role of AKT in CS-induced EC proliferation and survival. Cultured bovine aortic ECs were exposed to 10% strain at a frequency of 60 (60 cpm-10%) or 100 (100 cpm-10%) cycles/min or 15.6% strain at a frequency of 60 cycles/min (60 cpm-15.6%). AKT, glycogen synthase kinase (GSK)-3β, BAD, and cleaved caspase-3 were activated by CS in ECs. Increasing the magnitude or frequency of strain resulted in an earlier phosphorylation of GSK-3β, although the magnitude of phosphorylation was similar. After CS at 60 cpm-10% for 24 h, the number of nontransfected ECs was significantly increased by 8.5% ( P < 0.05). We found that the number of apoptotic ECs was slightly decreased with exposure to CS. ECs transfected with kinase-dead AKT (KA179) as well as plasmids containing a point mutation in the pleckstrin homology domain of AKT (RC25) not only prevented AKT, GSK-3β, and BAD phosphorylation but also inhibited the CS-induced increase in cell number as well as the CS-induced protection against apoptosis (both P < 0.05). The ratio of 5′-bromo-2′-deoxyuridine-positive cells was increased when ECs transfected with RC25 and KA179 as well as nontransfected ECs and ECs transfected with Lipofectamine 2000 were exposed to CS. We conclude that AKT is important in enhancing the survival of ECs exposed to CS but is not involved in EC proliferation.
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Affiliation(s)
- Kengo Nishimura
- Department of Surgery, Section of Vascular Surgery, Yale University School of Medicine, 333 Cedar St., FMB 137, New Haven, CT 06520-8062, USA
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Cheng L, Gu X, Sanderson JE, Wang X, Lee K, Yao X, Liu H, Cheung WL, Li M. A new function of a previously isolated compound that stimulates activation and differentiation of myogenic precursor cells leading to efficient myofiber regeneration and muscle repair. Int J Biochem Cell Biol 2006; 38:1123-33. [PMID: 16431151 DOI: 10.1016/j.biocel.2005.12.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2005] [Revised: 12/01/2005] [Accepted: 12/08/2005] [Indexed: 11/19/2022]
Abstract
Muscle repair following severe injury is slow and incomplete due to the limited regenerative capacity of muscles comprising the function. In this study, one pure compound structurally corresponding to triterpenoid, which can directly induce the activation, proliferation and maturation of quiescent satellite cells into myocytes in vitro, was isolated from Geum japonicum. The potential effect of this compound on myogenesis was further tested in repair of severe muscle injury. It was found that this compound could significantly stimulate the regenerative potential of the damaged muscle resulting in regeneration of myotubes and myotube bundles time-dependently replacing the damaged muscle tissues. This compound-mediated active regeneration of new myofibers repairing damaged muscles was probably due to its direct action on activation and proliferation of quiescent myogenic precursor cells and enhancement of their maturation into regenerating myotubes, as was demonstrated in our primary myogenic precursor cells culture experiments. The up-regulated expression of endogenous phospho-Akt1 in compound-treated myogenic precursor cells may also contribute to the process of myofiber regeneration and muscle repair probably via promoting myogenic cell survival capacity.
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Affiliation(s)
- Lei Cheng
- Department of Medicine and Therapeutics, 9th Floor, Clinical Building, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, NT, Hong Kong
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Kudo FA, Warycha B, Juran PJ, Asada H, Teso D, Aziz F, Frattini J, Sumpio BE, Nishibe T, Cha C, Dardik A. Differential responsiveness of early- and late-passage endothelial cells to shear stress. Am J Surg 2005; 190:763-9. [PMID: 16226955 DOI: 10.1016/j.amjsurg.2005.07.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2005] [Revised: 07/15/2005] [Accepted: 07/15/2005] [Indexed: 11/27/2022]
Abstract
BACKGROUND The incidence of vascular disease increases with age. Because atherosclerosis and neointimal hyperplasia colocalize in areas of disturbed shear stress, the effects of orbital shear stress (SS) on endothelial cell proliferation, protein kinase B (Akt) activation, and functional activity were analyzed using a senescence model. METHODS Early- (p3 to 7) and late- (p28 to 32) passage bovine aortic endothelial cells were exposed to orbital SS (210 rpm) or static conditions (0 to 5 days). Cell proliferation was directly counted and confirmed with proliferating cell nuclear antigen reactivity. Phosphorylated and total Akt were assessed with Western blotting. Endothelial cell-induced smooth muscle cell migration was assessed with a Boyden chamber. RESULTS Late-passage endothelial cells demonstrated no increase in orbital SS stimulated proliferation compared with early-passage cells (P = .42). Late-passage endothelial cells demonstrated decreased Akt phosphorylation in response to SS compared with early passage cells (n = 6, P = .01). Late-passage cells induced 26% less smooth muscle cell migration than early-passage cells (n = 3, P = .03). CONCLUSIONS Late-passage endothelial cells demonstrate decreased proliferation, Akt phosphorylation, and secretion of smooth muscle cell chemoattractants in response to orbital SS compared with early passage cells. These results suggest that late-passage endothelial cells respond to SS differently than early-passage cells and confirm the utility of the in vitro senescence model.
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Affiliation(s)
- Fabio A Kudo
- Department of Surgery, Yale University School of Medicine, Boyer Center for Molecular Medicine, 295 Congress Ave., New Haven, CT 06519, USA
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Gambillara V, Montorzi G, Haziza-Pigeon C, Stergiopulos N, Silacci P. Arterial Wall Response to ex vivo Exposure to Oscillatory Shear Stress. J Vasc Res 2005; 42:535-44. [PMID: 16179795 DOI: 10.1159/000088343] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2005] [Accepted: 08/04/2005] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The aim of this study was to analyze the arterial wall response to plaque-prone hemodynamic environments, known to occur mainly in areas of arterial trees such as bifurcations and branching points. In these areas, the vasculature is exposed to cyclically reversing flow that induces an endothelial dysfunction predisposing thus arteries to local development of atherosclerotic plaques. METHODS We used an ex vivo perfusion system that allows culturing arterial segments under different hemodynamic conditions. Porcine carotid arteries were exposed for 3 days to unidirectional high and low shear stress (6 +/- 3 and 0.3 +/- 0.1 dyn/cm(2)) as well as to oscillatory shear stress (0.3 +/- 3 dyn/cm(2)). This latter condition mimics the hemodynamics present at plaque-prone areas. At the end of the perfusion, the influence of different flow patterns on arterial metabolism was assessed in terms of matrix turnover as well as of smooth muscle cell function, differentiation and migration. RESULTS Our results show that after 3 days of perfusion none of the applied conditions influence smooth muscle cell phenotype retaining their full contraction capacity. However, an increase in the expression level of matrix metalloproteinase-2 and -9, as well as a decrease in plasminogen activator inhibitor-1 expression were observed in arteries exposed to oscillatory shear stress when compared to arteries exposed to unidirectional shear stress. CONCLUSION These observations suggest that plaque-prone hemodynamic environment triggers a vascular wall remodelling process and promotes changes in arterial wall metabolism, with important implication in atherogenesis.
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Affiliation(s)
- Veronica Gambillara
- Laboratory of Hemodynamics and Cardiovascular Technology, Swiss Federal Institute of Technology, Lausanne, Switzerland.
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Asada H, Paszkowiak J, Teso D, Alvi K, Thorisson A, Frattini JC, Kudo FA, Sumpio BE, Dardik A. Sustained orbital shear stress stimulates smooth muscle cell proliferation via the extracellular signal-regulated protein kinase 1/2 pathway. J Vasc Surg 2005; 42:772-80. [PMID: 16242567 DOI: 10.1016/j.jvs.2005.05.046] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2005] [Accepted: 05/25/2005] [Indexed: 01/12/2023]
Abstract
OBJECTIVE Nonlaminar shear stress stimulates smooth muscle cell (SMC) proliferation and migration in vivo, especially after an endothelial-denuding injury. To determine whether sustained shear stress directly stimulates SMC proliferation in vitro, the effect of orbital shear stress on SMC proliferation, phenotype, and extracellular signal-regulated protein kinase 1/2 (ERK1/2) phosphorylation was examined. METHODS Bovine SMCs were exposed to orbital shear stress (210 rpm) for up to 10 days, with and without the ERK1/2 upstream pathway inhibitor PD98059 (10 microM) or the p38 pathway inhibitor SB203580 (10 microM). Proliferation was directly counted and assessed with proliferation cell nuclear antigen. Western blotting was used to assess activation of SMC ERK1/2 and SMC phenotype markers. RESULTS SMCs exposed to sustained orbital shear stress (10 days) had 75% increased proliferation after 10 days compared with static conditions. Expression of markers of the contractile phenotype (alpha-actin, calponin) was decreased, and markers of the synthetic phenotype (vimentin, beta-actin) were increased. ERK1/2 was phosphorylated in the presence of orbital shear stress, and orbital shear-stress-stimulated SMC proliferation was inhibited in the presence of PD98059 but sustained in the presence of SB203580. Orbital shear-stress-induced changes in SMC phenotype were also inhibited in the presence of PD98059. CONCLUSION Orbital shear stress directly stimulates SMC proliferation in long-term culture in vitro and is mediated, at least partially, by the ERK1/2 pathway. The ERK1/2 pathway may also mediate the orbital shear-stress-stimulated switch from SMC contractile to synthetic phenotype. These results suggest that shear-stress-stimulated SMC proliferation after vascular injury is mediated by a pathway amenable to pharmacologic manipulation.
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Affiliation(s)
- Hidenori Asada
- Section of Vascular Surgery, Yale University School of Medicine, New Haven, Conn 06519, USA
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Dardik A, Yamashita A, Aziz F, Asada H, Sumpio BE. Shear stress-stimulated endothelial cells induce smooth muscle cell chemotaxis via platelet-derived growth factor-BB and interleukin-1alpha. J Vasc Surg 2005; 41:321-31. [PMID: 15768016 DOI: 10.1016/j.jvs.2004.11.016] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Vascular smooth muscle cell (SMC) migration is critical to the development of atherosclerosis and neointimal hyperplasia. Hemodynamic forces such as shear stress and cyclic strain stimulate endothelial cell signal-transduction pathways, resulting in the secretion of several factors, including SMC chemoattractants such as platelet-derived growth factor (PDGF). We hypothesized that mechanical forces stimulate endothelial cells to secrete SMC chemoattractants to induce migration via the mitogen-activated protein kinase (MAPK) pathway. METHODS Bovine aortic endothelial cells were exposed to shear stress, cyclic strain, or static conditions for 16 hours. The resulting conditioned medium was used as a SMC chemoattractant in a Boyden chamber. Activation of SMC extracellular signal-regulated protein kinase 1/2 (ERK1/2) was assessed by Western blot analysis. Pathways were inhibited with anti-PDGF-BB or anti-interleukin-1alpha (IL-1alpha) antibodies, or the ERK1/2 upstream pathway inhibitor PD98059. RESULTS Conditioned medium from endothelial cells exposed to shear stress corresponding to arterial levels of shear stress stimulated SMC migration but lower levels of shear stress or cyclic strain did not. Both PDGF-BB and IL-1alpha were secreted into the conditioned medium by endothelial cells stimulated with shear stress. Both PDGF-BB and IL-1alpha stimulated SMC chemotaxis but were not synergistic, and both stimulated SMC ERK1/2 phosphorylation. Inhibition of PDGF-BB or IL-1alpha inhibited SMC chemotaxis and ERK1/2 phosphorylation. CONCLUSION Shear stress stimulates endothelial cells to secrete several SMC chemoattractants, including PDGF-BB and IL-1alpha; both PDGF-BB and IL-1alpha stimulate SMC chemotaxis via the ERK1/2 signal-transduction pathway. These results suggest that the response to vascular injury may have a common pathway amenable to pharmacologic manipulation. CLINICAL RELEVANCE One difficulty in the pharmacologic treatment of atherosclerosis or neointimal hyperplasia leading to restenosis is the multiplicity of activated pathways and thus potential treatment targets. This study demonstrates that shear stress, a hemodynamic force that may be a biologically relevant stimulus to induce vascular pathology, stimulates endothelial cells to secrete PDGF-BB and IL-1alpha. Both of these mediators stimulate the SMC ERK1/2 pathway to induce migration, a critical event in the pathogenesis of atherosclerosis and neointimal hyperplasia. Therefore, this study suggests a relevant common target pathway in SMC that is amenable to manipulation for clinical treatment.
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Affiliation(s)
- Alan Dardik
- Section of Vascular Surgery, Yale University School of Medicine, New Haven, CT 06519, USA.
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