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Altundemir S, Lashkarinia SS, Pekkan K, Uğuz AK. Interstitial flow, pressure and residual stress in the aging carotid artery model in FEBio. Biomech Model Mechanobiol 2024; 23:179-192. [PMID: 37668853 DOI: 10.1007/s10237-023-01766-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Accepted: 08/16/2023] [Indexed: 09/06/2023]
Abstract
Vascular smooth muscle cells (VSMCs) are subject to interstitial flow-induced shear stress, which is a critical parameter in cardiovascular disease progression. Transmural pressure loading and residual stresses alter the hydraulic conductivity of the arterial layers and modulate the interstitial fluid flux through the arterial wall. In this paper, a biphasic multilayer model of a common carotid artery (CCA) with anisotropic fiber-reinforced soft tissue and strain-dependent permeability is developed in FEBio software. After the verification of the numerical predictions, age-related arterial thickening and stiffening effects on arterial deformation and interstitial flow are computed under physiological geometry and physical parameters. We found that circumferential residual stress shifts outward in each layer and its gradient increases up to 6 times with aging. Internally pressurized CCA displays nonlinear deformation. In the aged artery, the circumferential stress becomes greater on the media layer (82-158 kPa) and lower on the intima and adventitia (19-23 kPa and 25-28 kPa, respectively). The radial compression of the intima reduces the total hydraulic conductivity by 48% in the young and 16% in the aged arterial walls. Consequently, the average radial interstitial flux increases with pressure by 14% in the young and 91% in the aged arteries. Accordingly, the flow shear stress experienced by the VSMCs becomes more significant for aged arteries, which may accelerate cardiovascular disease progression compared to young arteries.
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Affiliation(s)
- Sercan Altundemir
- Department of Chemical Engineering, Boğaziçi University, Istanbul, 34342, Turkey.
| | - S Samaneh Lashkarinia
- Department of Bioengineering, Imperial College London, London, SW7 2AZ, UK
- Department of Mechanical Engineering, Koç University, Istanbul, 34450, Turkey
| | - Kerem Pekkan
- Department of Mechanical Engineering, Koç University, Istanbul, 34450, Turkey
| | - A Kerem Uğuz
- Department of Chemical Engineering, Boğaziçi University, Istanbul, 34342, Turkey.
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2
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Katoh K. Effects of Mechanical Stress on Endothelial Cells In Situ and In Vitro. Int J Mol Sci 2023; 24:16518. [PMID: 38003708 PMCID: PMC10671803 DOI: 10.3390/ijms242216518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 11/14/2023] [Accepted: 11/15/2023] [Indexed: 11/26/2023] Open
Abstract
Endothelial cells lining blood vessels are essential for maintaining vascular homeostasis and mediate several pathological and physiological processes. Mechanical stresses generated by blood flow and other biomechanical factors significantly affect endothelial cell activity. Here, we review how mechanical stresses, both in situ and in vitro, affect endothelial cells. We review the basic principles underlying the cellular response to mechanical stresses. We also consider the implications of these findings for understanding the mechanisms of mechanotransducer and mechano-signal transduction systems by cytoskeletal components.
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Affiliation(s)
- Kazuo Katoh
- Laboratory of Human Anatomy and Cell Biology, Faculty of Health Sciences, Tsukuba University of Technology, Tsukuba 305-8521, Japan
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3
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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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4
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Zhao Y, Richardson K, Yang R, Bousraou Z, Lee YK, Fasciano S, Wang S. Notch signaling and fluid shear stress in regulating osteogenic differentiation. Front Bioeng Biotechnol 2022; 10:1007430. [PMID: 36277376 PMCID: PMC9581166 DOI: 10.3389/fbioe.2022.1007430] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 09/16/2022] [Indexed: 11/24/2022] Open
Abstract
Osteoporosis is a common bone and metabolic disease that is characterized by bone density loss and microstructural degeneration. Human bone marrow-derived mesenchymal stem cells (hMSCs) are multipotent progenitor cells with the potential to differentiate into various cell types, including osteoblasts, chondrocytes, and adipocytes, which have been utilized extensively in the field of bone tissue engineering and cell-based therapy. Although fluid shear stress plays an important role in bone osteogenic differentiation, the cellular and molecular mechanisms underlying this effect remain poorly understood. Here, a locked nucleic acid (LNA)/DNA nanobiosensor was exploited to monitor mRNA gene expression of hMSCs that were exposed to physiologically relevant fluid shear stress to examine the regulatory role of Notch signaling during osteogenic differentiation. First, the effects of fluid shear stress on cell viability, proliferation, morphology, and osteogenic differentiation were investigated and compared. Our results showed shear stress modulates hMSCs morphology and osteogenic differentiation depending on the applied shear and duration. By incorporating this LNA/DNA nanobiosensor and alkaline phosphatase (ALP) staining, we further investigated the role of Notch signaling in regulating osteogenic differentiation. Pharmacological treatment is applied to disrupt Notch signaling to investigate the mechanisms that govern shear stress induced osteogenic differentiation. Our experimental results provide convincing evidence supporting that physiologically relevant shear stress regulates osteogenic differentiation through Notch signaling. Inhibition of Notch signaling mediates the effects of shear stress on osteogenic differentiation, with reduced ALP enzyme activity and decreased Dll4 mRNA expression. In conclusion, our results will add new information concerning osteogenic differentiation of hMSCs under shear stress and the regulatory role of Notch signaling. Further studies may elucidate the mechanisms underlying the mechanosensitive role of Notch signaling in stem cell differentiation.
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Affiliation(s)
- Yuwen Zhao
- Department of Chemistry, Chemical and Biomedical Engineering, University of New Haven, West Haven, CT, United States
- Department of Bioengineering, Lehigh University, Bethlehem, PA, United States
| | - Kiarra Richardson
- Department of Chemistry, Chemical and Biomedical Engineering, University of New Haven, West Haven, CT, United States
- Department of Biomedical Engineering, Duke University, Durham, NC, United States
| | - Rui Yang
- Department of Chemistry, Chemical and Biomedical Engineering, University of New Haven, West Haven, CT, United States
- Department of Biomedical Engineering, University of Connecticut, Storrs, CT, United States
| | - Zoe Bousraou
- Department of Chemistry, Chemical and Biomedical Engineering, University of New Haven, West Haven, CT, United States
| | - Yoo Kyoung Lee
- Department of Chemistry, Chemical and Biomedical Engineering, University of New Haven, West Haven, CT, United States
| | - Samantha Fasciano
- Department of Cellular and Molecular Biology, University of New Haven, West Haven, CT, United States
| | - Shue Wang
- Department of Chemistry, Chemical and Biomedical Engineering, University of New Haven, West Haven, CT, United States
- *Correspondence: Shue Wang,
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5
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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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6
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Meng F, Cheng H, Qian J, Dai X, Huang Y, Fan Y. In vitro fluidic systems: Applying shear stress on endothelial cells. MEDICINE IN NOVEL TECHNOLOGY AND DEVICES 2022. [DOI: 10.1016/j.medntd.2022.100143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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7
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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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8
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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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9
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Hosseini V, Mallone A, Nasrollahi F, Ostrovidov S, Nasiri R, Mahmoodi M, Haghniaz R, Baidya A, Salek MM, Darabi MA, Orive G, Shamloo A, Dokmeci MR, Ahadian S, Khademhosseini A. Healthy and diseased in vitro models of vascular systems. LAB ON A CHIP 2021; 21:641-659. [PMID: 33507199 DOI: 10.1039/d0lc00464b] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Irregular hemodynamics affects the progression of various vascular diseases, such atherosclerosis or aneurysms. Despite the extensive hemodynamics studies on animal models, the inter-species differences between humans and animals hamper the translation of such findings. Recent advances in vascular tissue engineering and the suitability of in vitro models for interim analysis have increased the use of in vitro human vascular tissue models. Although the effect of flow on endothelial cell (EC) pathophysiology and EC-flow interactions have been vastly studied in two-dimensional systems, they cannot be used to understand the effect of other micro- and macro-environmental parameters associated with vessel wall diseases. To generate an ideal in vitro model of the vascular system, essential criteria should be included: 1) the presence of smooth muscle cells or perivascular cells underneath an EC monolayer, 2) an elastic mechanical response of tissue to pulsatile flow pressure, 3) flow conditions that accurately mimic the hemodynamics of diseases, and 4) geometrical features required for pathophysiological flow. In this paper, we review currently available in vitro models that include flow dynamics and discuss studies that have tried to address the criteria mentioned above. Finally, we critically review in vitro fluidic models of atherosclerosis, aneurysm, and thrombosis.
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Affiliation(s)
- Vahid Hosseini
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Terasaki Institute for Biomedical Innovation, Los Angeles, CA 90024, USA.
| | - Anna Mallone
- Institute of Regenerative Medicine, University of Zurich, Zurich CH-8952, Switzerland
| | - Fatemeh Nasrollahi
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Terasaki Institute for Biomedical Innovation, Los Angeles, CA 90024, USA.
| | - Serge Ostrovidov
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and Department of Radiological Sciences, University of California-Los Angeles, CA 90095, USA
| | - Rohollah Nasiri
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Department of Mechanical Engineering, Sharif University of Technology, Tehran 1136511155, Iran
| | - Mahboobeh Mahmoodi
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Department of Biomedical Engineering, Yazd Branch, Islamic Azad University, Yazd 8915813135, Iran
| | - Reihaneh Haghniaz
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Terasaki Institute for Biomedical Innovation, Los Angeles, CA 90024, USA.
| | - Avijit Baidya
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA
| | - M Mehdi Salek
- School of Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA
| | - Mohammad Ali Darabi
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Terasaki Institute for Biomedical Innovation, Los Angeles, CA 90024, USA.
| | - Gorka Orive
- NanoBioCel Group, Laboratory of Pharmaceutics, School of Pharmacy, University of the Basque Country UPV/EHU, Paseo de la Universidad 7, Vitoria-Gasteiz 01006, Spain and Biomedical Research Networking Centre in Bioengineering, Biomaterials, and Nanomedicine (CIBER-BBN), Vitoria-Gasteiz 01007, Spain
| | - Amir Shamloo
- Department of Mechanical Engineering, Sharif University of Technology, Tehran 1136511155, Iran
| | - Mehmet R Dokmeci
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Terasaki Institute for Biomedical Innovation, Los Angeles, CA 90024, USA.
| | - Samad Ahadian
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Terasaki Institute for Biomedical Innovation, Los Angeles, CA 90024, USA.
| | - Ali Khademhosseini
- Center for Minimally Invasive Therapeutics (C-MIT), University of California-Los Angeles, CA 90095, USA and California NanoSystems Institute and Department of Bioengineering, University of California-Los Angeles, CA 90095, USA and Terasaki Institute for Biomedical Innovation, Los Angeles, CA 90024, USA.
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10
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Chen J, Zhou Y, Liu S, Li C. Biomechanical signal communication in vascular smooth muscle cells. J Cell Commun Signal 2020; 14:357-376. [PMID: 32780323 DOI: 10.1007/s12079-020-00576-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Accepted: 08/04/2020] [Indexed: 12/13/2022] Open
Abstract
Biomechanical stresses are closely associated with cardiovascular development and diseases. In vivo, vascular smooth muscle cells are constantly stimulated by biomechanical factors caused by increased blood pressure leading to the non-specific activation of cell transmembrane proteins. Thus, various intracellular signal molecules are simultaneously activated via signaling cascades, which are closely related to alterations in the differentiation, phenotype, inflammation, migration, pyroptosis, calcification, proliferation, and apoptosis of vascular smooth muscle cells. Meanwhile, mechanical stress-induced miRNAs and epigenetics modification on vascular smooth muscle cells play critical roles as well. Eventually, the overall pathophysiology of the cells is altered, resulting in the development of many major clinical diseases, including hypertension, atherosclerosis, grafted venous atherosclerosis, and aneurysm, among others. In this paper, important advances in mechanical signal communication in vascular smooth muscle cells are reviewed.
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Affiliation(s)
- Jingbo Chen
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Yan Zhou
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China
| | - Shuying Liu
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China.
| | - Chaohong Li
- Department of Histology and Embryology, Zhongshan School of Medicine, Sun Yat-sen University, Guangzhou, Guangdong, China.
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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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Evans NR, Tarkin JM, Chowdhury MM, Le EPV, Coughlin PA, Rudd JHF, Warburton EA. Dual-Tracer Positron-Emission Tomography for Identification of Culprit Carotid Plaques and Pathophysiology In Vivo. Circ Cardiovasc Imaging 2020; 13:e009539. [PMID: 32164454 DOI: 10.1161/circimaging.119.009539] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Inflammation and microcalcification are interrelated processes contributing to atherosclerotic plaque vulnerability. Positron-emission tomography can quantify these processes in vivo. This study investigates (1) 18F-fluorodeoxyglucose (FDG) and 18F-sodium fluoride (NaF) uptake in culprit versus nonculprit carotid atheroma, (2) spatial distributions of uptake, and (3) how macrocalcification affects this relationship. METHODS Individuals with acute ischemic stroke with ipsilateral carotid stenosis of ≥50% underwent FDG-positron-emission tomography and NaF-positron-emission tomography. Tracer uptake was quantified using maximum tissue-to-background ratios (TBRmax) and macrocalcification quantified using Agatston scoring. RESULTS In 26 individuals, median most diseased segment TBRmax (interquartile range) was higher in culprit than in nonculprit atheroma for both FDG (2.08 [0.52] versus 1.89 [0.40]; P<0.001) and NaF (2.68 [0.63] versus 2.39 [1.02]; P<0.001). However, whole vessel TBRmax was higher in culprit arteries for FDG (1.92 [0.41] versus 1.71 [0.31]; P<0.001) but not NaF (1.85 [0.28] versus 1.79 [0.60]; P=0.10). NaF uptake was concentrated at carotid bifurcations, while FDG was distributed evenly throughout arteries. Correlations between FDG and NaF TBRmax differed between bifurcations with low macrocalcification (rs=0.38; P<0.001) versus high macrocalcification (rs=0.59; P<0.001). CONCLUSIONS This is the first study to demonstrate increased uptake of both FDG and NaF in culprit carotid plaques, with discrete distributions of pathophysiology influencing vulnerability in vivo. These findings have implications for our understanding of the natural history of the disease and for the clinical assessment and management of carotid atherosclerosis.
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Affiliation(s)
- Nicholas R Evans
- Department of Clinical Neurosciences (N.R.E., E.A.W.), University of Cambridge, Cambridge, United Kingdom.,Department of Medicine (N.R.E., J.M.T., E.P.V.L., J.H.F.R.), University of Cambridge, Cambridge, United Kingdom
| | - Jason M Tarkin
- Department of Medicine (N.R.E., J.M.T., E.P.V.L., J.H.F.R.), University of Cambridge, Cambridge, United Kingdom
| | - Mohammed M Chowdhury
- Division of Vascular Surgery (M.M.C., P.A.C.), University of Cambridge, Cambridge, United Kingdom
| | - Elizabeth P V Le
- Department of Medicine (N.R.E., J.M.T., E.P.V.L., J.H.F.R.), University of Cambridge, Cambridge, United Kingdom
| | - Patrick A Coughlin
- Division of Vascular Surgery (M.M.C., P.A.C.), University of Cambridge, Cambridge, United Kingdom
| | - James H F Rudd
- Department of Medicine (N.R.E., J.M.T., E.P.V.L., J.H.F.R.), University of Cambridge, Cambridge, United Kingdom
| | - Elizabeth A Warburton
- Department of Clinical Neurosciences (N.R.E., E.A.W.), University of Cambridge, Cambridge, United Kingdom
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Ran K, Yang Z, Zhao Y, Wang X. Transmural pressure drives proliferation of human arterial smooth muscle cells via mechanism associated with NADPH oxidase and Survivin. Microvasc Res 2019; 126:103905. [DOI: 10.1016/j.mvr.2019.103905] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 06/12/2019] [Accepted: 07/05/2019] [Indexed: 10/26/2022]
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Sugita S, Kato M, Wataru F, Nakamura M. Three-dimensional analysis of the thoracic aorta microscopic deformation during intraluminal pressurization. Biomech Model Mechanobiol 2019; 19:147-157. [PMID: 31297645 PMCID: PMC7005079 DOI: 10.1007/s10237-019-01201-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 07/06/2019] [Indexed: 12/16/2022]
Abstract
The aorta is composed of various constituents with different mechanical properties. This heterogeneous structure implies non-uniform deformation in the aorta, which could affect local cell functions. The present study investigates 3D strains of the aorta at a cell scale induced by intraluminal pressurization. After resected mouse, thoracic aortas were stretched to their in vivo length, and the aortas were pressurized at 15, 40, 80, 120, and 160 mmHg. Images of autofluorescent light of elastin were captured under a two-photon microscope. From the movement of markers in elastic laminas (ELs) created by photo-bleaching, 3D strains (εθθ, εzz, εrr, εrθ, εrz, εθz) between two neighboring ELs in the circumferential (θ), longitudinal (z), and radial (r) directions with reference to the dimensions at 15 mmHg were calculated. The results demonstrated that the average of shear strain εrθ was almost 0 in a physiological pressure range (from 80 to 120 mmHg) with an absolute value |εrθ| changing approximately by 5%. This indicates that ELs experience radial–circumferential shear at the cell scale, but not at the whole tissue scale. The normal strains in the circumferential εθθ and longitudinal direction εzz were positive but that in the radial direction εrr was almost 0, which demonstrates that aortic tissue is not an incompressible material. The first principal direction in the radial–circumferential plane was 29° ± 13° from the circumferential direction. We show that the aorta is not simply stretched in the circumferential direction during pressurization and that cells in the aorta undergo complex deformations by nature.
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Affiliation(s)
- Shukei Sugita
- Biomechanics Laboratory, Department of Electrical and Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan.
| | - Masaya Kato
- Biomechanics Laboratory, Department of Electrical and Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
| | - Fukui Wataru
- Biomechanics Laboratory, Department of Electrical and Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
| | - Masanori Nakamura
- Biomechanics Laboratory, Department of Electrical and Mechanical Engineering, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya, 466-8555, Japan
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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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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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Valdivieso P, Toigo M, Hoppeler H, Flück M. T/T homozygosity of the tenascin-C gene polymorphism rs2104772 negatively influences exercise-induced angiogenesis. PLoS One 2017; 12:e0174864. [PMID: 28384286 PMCID: PMC5383042 DOI: 10.1371/journal.pone.0174864] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 03/16/2017] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Mechanical stress, including blood pressure related factors, up-regulate expression of the pro-angiogenic extracellular matrix protein tenascin-C in skeletal muscle. We hypothesized that increased capillarization of skeletal muscle with the repeated augmentation in perfusion during endurance training is associated with blood vessel-related expression of tenascin-C and would be affected by the single-nucleotide polymorphism (SNP) rs2104772, which characterizes the non-synonymous exchange of thymidine (T)-to-adenosine (A) in the amino acid codon 1677 of tenascin-C. METHODS Sixty-one healthy, untrained, male white participants of Swiss descent performed thirty 30-min bouts of endurance exercise on consecutive weekdays using a cycling ergometer. Genotype and training interactions were called significant at Bonferroni-corrected p-value of 5% (repeated measures ANOVA). RESULTS Endurance training increased capillary-to-fiber-ratio (+11%), capillary density (+7%), and mitochondrial volume density (+30%) in m. vastus lateralis. Tenascin-C protein expression in this muscle was confined to arterioles and venules (80% of cases) and increased after training in A-allele carriers. Prior to training, volume densities of subsarcolemmal and myofibrillar mitochondria in m. vastus lateralis muscle were 49% and 18%, respectively, higher in A/A homozygotes relative to T-nucleotide carriers (A/T and T/T). Training specifically increased capillary-to-fiber ratio in A-nucleotide carriers but not in T/T homozygotes. Genotype specific regulation of angiogenesis was reflected by the expression response of 8 angiogenesis-associated transcripts after exercise, and confirmed by training-induced alterations of the shear stress related factors, vimentin and VEGF A. CONCLUSION Our findings provide evidence for a negative influence of T/T homozygosity in rs2104772 on capillary remodeling with endurance exercise.
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Affiliation(s)
- Paola Valdivieso
- Laboratory for Muscle Plasticity, Department of Orthopedics, University of Zurich, Balgrist Campus, Zurich, Switzerland
| | - Marco Toigo
- Laboratory for Muscle Plasticity, Department of Orthopedics, University of Zurich, Balgrist Campus, Zurich, Switzerland
| | - Hans Hoppeler
- Institute of Anatomy, University of Berne, Berne, Switzerland
| | - Martin Flück
- Laboratory for Muscle Plasticity, Department of Orthopedics, University of Zurich, Balgrist Campus, Zurich, Switzerland
- Institute of Anatomy, University of Berne, Berne, Switzerland
- * E-mail:
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Gao H, Cheng Y, Zong L, Huang L, Qiao C, Li W, Gong B, Hu J, Liu H, Wang X, Zhao C. Aspirin attenuates monocrotaline-induced pulmonary arterial hypertension in rats by suppressing the ERK/MAPK pathway. Clin Exp Hypertens 2017; 39:34-41. [PMID: 28055284 DOI: 10.1080/10641963.2016.1210620] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This study aimed to investigate the therapeutic effects of aspirin (ASA) and its potential mechanisms of action in monocrotaline (MCT)-induced pulmonary arterial hypertension (PAH) in rats. PAH was induced in a rat model by a single intraperitoneal (IP) injection of MCT. Saline was injected in a control group. Two weeks following MCT injection, right ventricular systolic pressure (RVSP) and systolic blood pressure (SBP) were measured in six rats from each group to confirm establishment of a PAH model. The remaining MCT-treated rats were randomly allocated to receive IP injection of saline, ASA, or ERK1/2 inhibitor PD98059. Four weeks following treatment, RVSP was measured and all rats were sacrificed for histological study. There was no significant difference in SBP in any group two weeks following MCT administration. Nonetheless RVSP was significantly increased in the MCT group compared with the control group. At 6 weeks, ASA treatment remarkably attenuated MCT-induced increased RVSP, RV hypertrophy, and pulmonary artery remodeling compared with the MCT group. The density of pulmonary capillaries in ASA-treated rats was also dramatically increased. Treatment with ASA significantly inhibited the increased p-ERK1/2 and restored the impaired endothelial nitric oxide synthase (eNOS) in MCT-treated rats. This study demonstrated that ASA distinctively attenuates MCT-induced PAH by inhibition of the ERK1/2 signaling pathway.
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Affiliation(s)
- Hua Gao
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Yuqing Cheng
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Liguo Zong
- b Department of Intensive Care Unit , Zaozhuang Municipal Hospital , Zaozhuang , Shandong , P.R. China
| | - Linian Huang
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Chenchen Qiao
- c Department of Cardiology , First Municipal Hospital of Bengbu , Bengbu , Anhui , P.R. China
| | - Wei Li
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Beilei Gong
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Junfeng Hu
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Haitao Liu
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Xiaojing Wang
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. China
| | - Chengling Zhao
- a Department of Respiration , First Affiliated Hospital of Bengbu Medical College, Anhui Clinical and Preclinical Key Laboratory of Respiratory Disease , Bengbu , Anhui , P.R. 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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20
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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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Maurel B, Sarraf C, Bakir F, Chai F, Maton M, Sobocinski J, Hertault A, Blanchemain N, Haulon S, Lermusiaux P. A New Hemodynamic Ex Vivo Model for Medical Devices Assessment. Ann Vasc Surg 2015; 29:1648-55. [PMID: 26254604 DOI: 10.1016/j.avsg.2015.06.066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2014] [Revised: 06/01/2015] [Accepted: 06/07/2015] [Indexed: 10/23/2022]
Abstract
BACKGROUND In-stent restenosis (ISR) remains a major public health concern associated with an increased morbidity, mortality, and health-related costs. Drug-eluting stents (DES) have reduced ISR, but generate healing-related issues or hypersensitivity reactions, leading to an increased risk of late acute stent thrombosis. Assessments of new DES are based on animal models or in vitro release systems, which have several limitations. The role of flow and shear stress on endothelial cell and ISR has also been emphasized. The aim of this work was to design and first evaluate an original bioreactor, replicating ex vivo hemodynamic and biological conditions similar to human conditions, to further evaluate new DES. METHODS This bioreactor was designed to study up to 6 stented arteries connected in bypass, immersed in a culture box, in which circulated a physiological systolo-diastolic resistive flow. Two centrifugal pumps drove the flow. The main pump generated pulsating flows by modulation of rotation velocity, and the second pump worked at constant rotation velocity, ensuring the counter pressure levels and backflows. The flow rate, the velocity profile, the arterial pressure, and the resistance of the flow were adjustable. The bioreactor was placed in an incubator to reproduce a biological environment. RESULTS A first feasibility experience was performed over a 24-day period. Three rat aortic thoracic arteries were placed into the bioreactor, immersed in cell culture medium changed every 3 days, and with a circulating systolic and diastolic flux during the entire experimentation. There was no infection and no leak. At the end of the experimentation, a morphometric analysis was performed confirming the viability of the arteries. CONCLUSIONS We designed and patented an original hemodynamic ex vivo model to further study new DES, as well as a wide range of vascular diseases and medical devices. This bioreactor will allow characterization of the velocity field and drug transfers within a stented artery with new functionalized DES, with experimental means not available in vivo. Another major benefit will be the reduction of animal experimentation and the opportunity to test new DES or other vascular therapeutics in human tissues (human infrapopliteal or coronary arteries collected during human donation).
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Affiliation(s)
- Blandine Maurel
- Aortic Centre, Department of Vascular Surgery, CHRU Lille, Lille, France; INSERM U1008, Groupe Recherche Biomatériaux, University of Lille, Lille, France.
| | | | - Farid Bakir
- Laboratoire DynFluid, Arts et Métiers ParisTech, Paris, France
| | - Feng Chai
- INSERM U1008, Groupe Recherche Biomatériaux, University of Lille, Lille, France
| | - Mickael Maton
- INSERM U1008, Groupe Recherche Biomatériaux, University of Lille, Lille, France
| | - Jonathan Sobocinski
- Aortic Centre, Department of Vascular Surgery, CHRU Lille, Lille, France; INSERM U1008, Groupe Recherche Biomatériaux, University of Lille, Lille, France
| | - Adrien Hertault
- Aortic Centre, Department of Vascular Surgery, CHRU Lille, Lille, France; INSERM U1008, Groupe Recherche Biomatériaux, University of Lille, Lille, France
| | - Nicolas Blanchemain
- INSERM U1008, Groupe Recherche Biomatériaux, University of Lille, Lille, France
| | - Stephan Haulon
- Aortic Centre, Department of Vascular Surgery, CHRU Lille, Lille, France; INSERM U1008, Groupe Recherche Biomatériaux, University of Lille, Lille, France
| | - Patrick Lermusiaux
- Department of Vascular Surgery, Groupement Hospitalier Edouard Herriot, CHU Lyon, Faculté de médecine Lyon 1, Université Claude Bernard Lyon 1, Lyon, France
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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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23
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Yang F, Zhao JF, Shou QY, Huang XJ, Chen G, Yang KB, Zhang SG, Lv BD, Fu HY. Phenotypic modulation of corpus cavernosum smooth muscle cells in a rat model of cavernous neurectomy. PLoS One 2014; 9:e105186. [PMID: 25127037 PMCID: PMC4134279 DOI: 10.1371/journal.pone.0105186] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2014] [Accepted: 07/17/2014] [Indexed: 02/02/2023] Open
Abstract
Background Patients undergoing radical prostatectomy (RP) are at high risk for erectile dysfunction (ED) due to potential cavernous nerve (CN) damage during surgery. Penile hypoxia after RP is thought to significantly contribute to ED pathogenesis. Aim We previously showed that corpora cavernosum smooth muscle cells (CCSMCs) undergo phenotypic modulation under hypoxic conditions in vitro. Here, we studied such changes in an in vivo post-RP ED model by investigating CCSMCs in bilateral cavernous neurectomy (BCN) rats. Methods Sprague-Dawley rats underwent sham (n = 12) or BCN (n = 12) surgery. After 12 weeks, they were injected with apomorphine to determine erectile function. The penile tissues were harvested and assessed for fibrosis using Masson trichrome staining and for molecular markers of phenotypic modulation using immunohistochemistry and western blotting. CCSMC morphological structure was evaluated by hematoxylin-eosin (H&E) staining and transmission electron microscopy (TEM). Results Erectile function was significantly lower in BCN rats than in sham rats. BCN increased hypoxia-inducible factor-1α and collagen protein expression in corpora cavernous tissue. H&E staining and TEM showed that CCSMCs in BCN rats underwent hypertrophy and showed rough endoplasmic reticulum formation. The expression of CCSMC phenotypic markers, such as smooth muscle α-actin, smooth muscle myosin heavy chain, and desmin, was markedly lower, whereas vimentin protein expression was significantly higher in BCN rats than in control rats. Conclusions CCSMCs undergo phenotype modulation in rats with cavernous neurectomy. The results have unveiled physiological transformations that occur at the cellular and molecular levels and have helped characterize CN injury–induced ED.
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Affiliation(s)
- Fan Yang
- Department of Urology, The Second Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, China
| | - Jian F. Zhao
- Department of Urology, The Second Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, China
| | - Qi Y. Shou
- Laboratory Animal Research Center, Zhejiang Chinese Medical University, Hangzhou, China
| | - Xiao J. Huang
- Department of Urology, The Second Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, China
| | - Gang Chen
- Department of Urology, The Second Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, China
| | - Ke B. Yang
- Department of Urology, The Second Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, China
| | - Shi G. Zhang
- Department of Urology, The Second Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, China
| | - Bo D. Lv
- Department of Urology, The Second Affiliated Hospital, Zhejiang Chinese Medical University, Hangzhou, China
- Andrology Laboratory on Integration of Chinese and Western Medicine, Zhejiang provincial Key Laboratory of Traditional Chinese Medicine, Hangzhou, China
- * E-mail: (BDL); (HYF)
| | - Hui Y. Fu
- Central Laboratory, The Second Clinical Medical College, Zhejiang Chinese Medical University, Hangzhou, China
- Andrology Laboratory on Integration of Chinese and Western Medicine, Zhejiang provincial Key Laboratory of Traditional Chinese Medicine, Hangzhou, China
- * E-mail: (BDL); (HYF)
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Synergistic effects of orbital shear stress on in vitro growth and osteogenic differentiation of human alveolar bone-derived mesenchymal stem cells. BIOMED RESEARCH INTERNATIONAL 2014; 2014:316803. [PMID: 24575406 PMCID: PMC3914586 DOI: 10.1155/2014/316803] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 07/18/2013] [Accepted: 09/30/2013] [Indexed: 11/17/2022]
Abstract
Cellular behavior is dependent on a variety of physical cues required for normal tissue function. In order to mimic native tissue environments, human alveolar bone-derived mesenchymal stem cells (hABMSCs) were exposed to orbital shear stress (OSS) in a low-speed orbital shaker. The synergistic effects of OSS on proliferation and differentiation of hABMSCs were investigated. In particular, we induced the osteoblastic differentiation of hABMSCs cultured in the absence of OM by exposing hABMSCs to OSS (0.86-1.51 dyne/cm(2)). Activation of Cx43 was associated with exposure of hABMSCs to OSS. The viability of cells stimulated for 10, 30, 60, 120, and 180 min/day increased by approximately 10% compared with that of control. The OSS groups with stimulation of 10, 30, and 60 min/day had more intense mineralized nodules compared with the control group. In quantification of vascular endothelial growth factor (VEGF) and bone morphogenetic protein-2 (BMP-2) protein, VEGF protein levels under stimulation for 10, 60, and 180 min/day and BMP-2 levels under stimulation for 60, 120, and 180 min/day were significantly different compared with those of the control. In conclusion, the results indicated that exposing hABMSCs to OSS enhanced their differentiation and maturation.
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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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Van der Heiden K, Gijsen FJH, Narracott A, Hsiao S, Halliday I, Gunn J, Wentzel JJ, Evans PC. The effects of stenting on shear stress: relevance to endothelial injury and repair. Cardiovasc Res 2013; 99:269-75. [PMID: 23592806 DOI: 10.1093/cvr/cvt090] [Citation(s) in RCA: 91] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Stent deployment following balloon angioplasty is used routinely to treat coronary artery disease. These interventions cause damage and loss of endothelial cells (EC), and thus promote in-stent thrombosis and restenosis. Injured arteries are repaired (intrinsically) by locally derived EC and by circulating endothelial progenitor cells which migrate and proliferate to re-populate denuded regions. However, re-endothelialization is not always complete and often dysfunctional. Moreover, the molecular and biomechanical mechanisms that control EC repair and function in stented segments are poorly understood. Here, we propose that stents modify endothelial repair processes, in part, by altering fluid shear stress, a mechanical force that influences EC migration and proliferation. A more detailed understanding of the biomechanical processes that control endothelial healing would provide a platform for the development of novel therapeutic approaches to minimize damage and promote vascular repair in stented arteries.
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Affiliation(s)
- Kim Van der Heiden
- Biomedical Engineering, Department Cardiology, ErasmusMC, Rotterdam, The Netherlands
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Ramanathan D, Temkin N, Kim LJ, Ghodke B, Sekhar LN. Cerebral bypasses for complex aneurysms and tumors: long-term results and graft management strategies. Neurosurgery 2012; 70:1442-57; discussion 1457. [PMID: 22278357 DOI: 10.1227/neu.0b013e31824c046f] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Various techniques of cerebral bypasses are used to treat aneurysms and tumors. OBJECTIVE To study long-term clinical and radiological outcome of various bypass types and to analyze techniques used in the management of long-term graft problems. METHODS A consecutive series of patients who underwent revascularization during a 5-year period were analyzed for indications, graft patency, and neurological outcomes. Potential risk factors for bypass problems and the management of bypass stenosis were studied. RESULTS A total of 80 patients (69 with aneurysms and 11 with tumors) underwent 88 bypasses (59 extracranial-to-intracranial [EC-IC] bypasses [10 low flow, 49 high flow], 9 intracranial-to-intracranial [IC-IC] bypasses [3 long, 6 short], and 20 local bypasses), with mean radiological follow-up of 32 months (range, 1-53 months). At late follow-up, 5 of 9 (56%) IC-IC (5 short, 0 long grafts), 8 of 9 (90%) EC-IC low-flow, 44 of 48 (92%) EC-IC high-flow, and all local bypasses were patent. Four patients with EC-IC high-flow bypass occlusions were asymptomatic, but transient ischemic attacks were noted in 3 of 6 patients with graft stenosis. None of the risk factors evaluated were significantly predictive of EC-IC graft occlusions or stenosis. EC-IC HF graft stenoses were permanently corrected by microsurgery (n = 4) or endovascular surgery (n = 1). CONCLUSION The EC-IC and local bypasses have higher long-term patency rates (91% and 100%) compared with IC-IC bypasses (66%, 0% long graft). Some EC-IC bypasses may occlude asymptomatically (9%) or develop graft stenosis (13%) over the long term. Microsurgical and endovascular surgical techniques have been developed to treat graft stenosis.
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Affiliation(s)
- Dinesh Ramanathan
- Department of Neurological Surgery, University of Washington, Seattle, Washington 98104, USA
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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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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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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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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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Beamish JA, He P, Kottke-Marchant K, Marchant RE. Molecular regulation of contractile smooth muscle cell phenotype: implications for vascular tissue engineering. TISSUE ENGINEERING PART B-REVIEWS 2011; 16:467-91. [PMID: 20334504 DOI: 10.1089/ten.teb.2009.0630] [Citation(s) in RCA: 282] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The molecular regulation of smooth muscle cell (SMC) behavior is reviewed, with particular emphasis on stimuli that promote the contractile phenotype. SMCs can shift reversibly along a continuum from a quiescent, contractile phenotype to a synthetic phenotype, which is characterized by proliferation and extracellular matrix (ECM) synthesis. This phenotypic plasticity can be harnessed for tissue engineering. Cultured synthetic SMCs have been used to engineer smooth muscle tissues with organized ECM and cell populations. However, returning SMCs to a contractile phenotype remains a key challenge. This review will integrate recent work on how soluble signaling factors, ECM, mechanical stimulation, and other cells contribute to the regulation of contractile SMC phenotype. The signal transduction pathways and mechanisms of gene expression induced by these stimuli are beginning to be elucidated and provide useful information for the quantitative analysis of SMC phenotype in engineered tissues. Progress in the development of tissue-engineered scaffold systems that implement biochemical, mechanical, or novel polymer fabrication approaches to promote contractile phenotype will also be reviewed. The application of an improved molecular understanding of SMC biology will facilitate the design of more potent cell-instructive scaffold systems to regulate SMC behavior.
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Affiliation(s)
- Jeffrey A Beamish
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7207, USA
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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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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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Luo DX, Cheng J, Xiong Y, Li J, Xia C, Xu C, Wang C, Zhu B, Hu Z, Liao DF. Static pressure drives proliferation of vascular smooth muscle cells via caveolin-1/ERK1/2 pathway. Biochem Biophys Res Commun 2010; 391:1693-7. [DOI: 10.1016/j.bbrc.2009.12.132] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2009] [Accepted: 12/23/2009] [Indexed: 10/20/2022]
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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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Pyle AL, Atkinson JB, Pozzi A, Reese J, Eckes B, Davidson JM, Crimmins DL, Young PP. Regulation of the atheroma-enriched protein, SPRR3, in vascular smooth muscle cells through cyclic strain is dependent on integrin alpha1beta1/collagen interaction. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 173:1577-88. [PMID: 18832573 DOI: 10.2353/ajpath.2008.080042] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Atherosclerotic plaques express high levels of small proline-rich repeat protein (SPRR3), a previously characterized component of the cornified cell envelope of stratified epithelia, where it is believed to play a role in cellular adaptation to biomechanical stress. We investigated the physiological signals and underlying mechanism(s) that regulate atheroma-enriched SPRR3 expression in vascular smooth muscle cells (VSMCs). We showed that SPRR3 is expressed by VSMCs in both human and mouse atheromas. In cultured arterial VSMCs, mechanical cyclic strain, but neither shear stress nor lipid loading induced SPRR3 expression. Furthermore, this upregulation of SPRR3 expression was dependent on VSMC adherence to type I collagen. To link the mechanoregulation of SPRR3 to specific collagen/integrin interactions, we used blocking antibodies against either integrin alpha1 or alpha2 subunits and VSMCs from mice that lack specific collagen receptors. Our results showed a dependence on the alpha1beta1 integrin for SPRR3 expression induced by cyclic strain. Furthermore, we showed that integrin alpha1 but not alpha2 subunits were expressed on VSMCs within mouse lesions but not in normal arteries. Therefore, we identified the enrichment of the mechanical strain-regulated protein SPRR3 in VSMCs of both human and mouse atherosclerotic lesions whose expression is dependent on the collagen-binding integrin alpha1beta1 on VSMCs. These data suggest that SPRR3 may play a role in VSMC adaptation to local biomechanical stress within the plaque microenvironment.
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Affiliation(s)
- Amy L Pyle
- Vanderbilt University Medical Center, Department of Pathology, Nashville, TN 37232, USA
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Rotating versus perfusion bioreactor for the culture of engineered vascular constructs based on hyaluronic acid. Biotechnol Bioeng 2008; 100:988-97. [DOI: 10.1002/bit.21828] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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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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Prokazova NV, Samovilova NN, Golovanova NK, Gracheva EV, Korotaeva AA, Andreeva ER. Lipid second messengers and cell signaling in vascular wall. BIOCHEMISTRY (MOSCOW) 2007; 72:797-808. [PMID: 17922637 DOI: 10.1134/s0006297907080019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Agonists of cellular receptors, such as receptor tyrosine kinases, G protein-coupled receptors, cytokine receptors, etc., activate phospholipases (C(gamma), C(beta), A(2), D), sphingomyelinase, and phosphatidylinositol-3-kinase. This produces active lipid metabolites, some of which are second messengers: inositol trisphosphate, diacylglycerides, ceramide, and phosphatidylinositol 3,4,5-trisphosphate. These universal mechanisms are involved in signal transduction to maintain blood vessel functions: regulation of vasodilation and vasoconstriction, mechanical stress resistance, and anticoagulant properties of the vessel lumen surface. Different signaling pathways realized through lipid second messengers interact to one another and modulate intracellular events. In early stages of atherogenesis, namely, accumulation of low density lipoproteins in the vascular wall, cascades of pro-atherogenic signal transduction are triggered through lipid second messengers. This leads to atherosclerosis, the general immuno-inflammatory disease of the vascular system.
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Affiliation(s)
- N V Prokazova
- Institute of Experimental Cardiology, Russian Cardiology Research Center, Moscow, 121552, Russia.
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Muto A, Fitzgerald TN, Pimiento JM, Maloney S, Teso D, Paszkowiak JJ, Westvik TS, Kudo FA, Nishibe T, Dardik A. Smooth muscle cell signal transduction: implications of vascular biology for vascular surgeons. J Vasc Surg 2007; 45 Suppl A:A15-24. [PMID: 17544020 PMCID: PMC1939976 DOI: 10.1016/j.jvs.2007.02.061] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Accepted: 02/17/2007] [Indexed: 12/31/2022]
Abstract
Vascular smooth muscle cells exhibit varied responses after vessel injury and surgical interventions, including phenotypic switching, migration, proliferation, protein synthesis, and apoptosis. Although the source of the smooth muscle cells that accumulate in the vascular wall is controversial, possibly reflecting migration from the adventitia, from the circulating blood, or in situ differentiation, the intracellular signal transduction pathways that control these processes are being defined. Some of these pathways include the Ras-mitogen-activated protein kinase, phosphatidylinositol 3-kinase-Akt, Rho, death receptor-caspase, and nitric oxide pathways. Signal transduction pathways provide amplification, redundancy, and control points within the cell and culminate in biologic responses. We review some of the signaling pathways activated within smooth muscle cells that contribute to smooth muscle cell heterogeneity and development of pathology such as restenosis and neointimal hyperplasia.
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MESH Headings
- Animals
- Apoptosis
- Bone Marrow Cells/metabolism
- Cell Differentiation
- Cell Movement
- Cell Proliferation
- Constriction, Pathologic/metabolism
- Constriction, Pathologic/pathology
- Extracellular Matrix/metabolism
- Humans
- Hyperplasia/metabolism
- Hyperplasia/pathology
- Muscle, Smooth, Vascular/injuries
- Muscle, Smooth, Vascular/metabolism
- Muscle, Smooth, Vascular/pathology
- Muscle, Smooth, Vascular/physiopathology
- Muscle, Smooth, Vascular/surgery
- Myocytes, Smooth Muscle/metabolism
- Myocytes, Smooth Muscle/pathology
- Phenotype
- Protein Kinases/metabolism
- Signal Transduction
- Stem Cells/metabolism
- Vascular Surgical Procedures/adverse effects
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Affiliation(s)
- Akihito Muto
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, CT, USA
| | - Tamara N Fitzgerald
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, CT, USA
| | - Jose M Pimiento
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, CT, USA
- Saint Mary’s Hospital, Waterbury, CT, USA
| | - Stephen Maloney
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, CT, USA
- Saint Mary’s Hospital, Waterbury, CT, USA
| | - Desarom Teso
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Saint Mary’s Hospital, Waterbury, CT, USA
| | - Jacek J Paszkowiak
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Saint Mary’s Hospital, Waterbury, CT, USA
| | - Tormod S Westvik
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, CT, USA
| | - Fabio A Kudo
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, CT, USA
| | | | - Alan Dardik
- Department of Surgery, Yale University School of Medicine, New Haven, CT, USA
- Department of Interdepartmental Program in Vascular Biology and Transplantation, Yale University School of Medicine, New Haven, CT, USA
- VA Connecticut Healthcare System, West Haven, CT, USA
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Zhou W, Dasgupta C, Negash S, Raj JU. Modulation of pulmonary vascular smooth muscle cell phenotype in hypoxia: role of cGMP-dependent protein kinase. Am J Physiol Lung Cell Mol Physiol 2007; 292:L1459-66. [PMID: 17322285 DOI: 10.1152/ajplung.00143.2006] [Citation(s) in RCA: 42] [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] Open
Abstract
Chronic hypoxia triggers pulmonary vascular remodeling, which is associated with a modulation of the vascular smooth muscle cell (SMC) phenotype from a contractile, differentiated to a synthetic, dedifferentiated state. We previously reported that acute hypoxia represses cGMP-dependent protein kinase (PKG) expression in ovine fetal pulmonary venous SMCs (FPVSMCs). Therefore, we tested if altered expression of PKG could explain SMC phenotype modulation after exposure to hypoxia. Hypoxia-induced reduction in PKG protein expression strongly correlated with the repressed expression of SMC phenotype markers, myosin heavy chain (MHC), calponin, vimentin, alpha-smooth muscle actin (alphaSMA), and thrombospondin (TSP), indicating that hypoxic exposure of SMC induced phenotype modulation to dedifferentiated state, and PKG may be involved in SMC phenotype modulation. PKG-specific small interfering RNA (siRNA) transfection in FPVSMCs significantly attenuated calponin, vimentin, and MHC expression, with no effect on alphaSMA and TSP. Treatment with 30 microM Drosophila Antennapedia (DT-3), a membrane-permeable peptide inhibitor of PKG, attenuated the expression of TSP, MHC, alphaSMA, vimentin, and calponin. The results from PKG siRNA and DT-3 studies indicate that hypoxia-induced reduction in protein expression was also similarly impacted by PKG inhibition. Overexpression of PKG in FPVSMCs by transfection with a full-length PKG construct tagged with green fluorescent fusion protein (PKG-GFP) reversed the effect of hypoxia on the expression of SMC phenotype marker proteins. These results suggest that PKG could be one of the determinants for the expression of SMC phenotype marker proteins and may be involved in the maintenance of the differentiated phenotype in pulmonary vascular SMCs in hypoxia.
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Affiliation(s)
- Weilin Zhou
- Division of Neonatology, Harbor-UCLA Medical Center, Los Angeles Biomedical Research Institute at Harbor-UCLA, 1124 West Carson St., Torrance, CA 90502, USA.
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Preis M, Cohen T, Sarnatzki Y, Ben Yosef Y, Schneiderman J, Gluzman Z, Koren B, Lewis BS, Shaul Y, Flugelman MY. Effects of fibulin-5 on attachment, adhesion, and proliferation of primary human endothelial cells. Biochem Biophys Res Commun 2006; 348:1024-33. [PMID: 16904068 DOI: 10.1016/j.bbrc.2006.07.156] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2006] [Accepted: 07/24/2006] [Indexed: 11/25/2022]
Abstract
BACKGROUND Fibulin-5 is a novel extracellular protein that is thought to act as a bridging peptide between elastin fibers and cell surface integrins in blood vessel wall. Fibulin-5 binding to endothelial cell (EC) surface integrins may effect cell proliferation and cell attachment to extracellular matrix (ECM) or to artificial surfaces. In this paper, we describe the effects of fibulin-5 on attachment, adhesion, and proliferation of primary human EC. After demonstrating that fibulin-5 over-expression inhibited EC proliferation, we tested the hypothesis that co-expression of fibulin-5 and VEGF165 will lead to unique EC phenotype that will exhibit increased adherence properties and retain its proliferation capacity. METHODS AND RESULTS Fibulin-5 and VEGF165 gene transfer to primary human saphenous vein endothelial cells was accomplished using retroviral vectors encoding the two genes. Transgene expression was verified using immunohistochemistry, Western blotting, and ELISA. Fibulin 5 over-expression tended to improve immediate EC attachment (30 min after seeding) and improved significantly adhesion (>40%) under shear stress tested 24h after EC seeding. The effects of fibulin-5 and VEGF165 on EC proliferation in the presence or absence of basic FGF were also tested. EC expressing fibulin-5 had reduced proliferation while VEGF165 co-expression ameliorated this effect. CONCLUSION Fibulin-5 improved EC attachment to artificial surfaces. Dual transfer of fibulin-5 and VEGF165 resulted in EC phenotype with increased adhesion and improved proliferation. This unique EC phenotype can be useful for tissue engineering on endovascular prostheses.
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Affiliation(s)
- M Preis
- Department of Cardiovascular Medicine, Lady Davis Carmel Medical Center, 7 Michal Street, Haifa 34632, Israel
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