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Wang Z, Yao C, Huang L, Liang J, Zhang X, Shi J, Wei W, Zhou J, Zhang Y, Wu G. Enhanced external counterpulsation improves dysfunction of forearm muscle caused by radial artery occlusion. Front Cardiovasc Med 2023; 10:1115494. [PMID: 36937941 PMCID: PMC10022471 DOI: 10.3389/fcvm.2023.1115494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Accepted: 02/14/2023] [Indexed: 03/06/2023] Open
Abstract
Objective This study aimed to investigate the therapeutic effect of enhanced external counterpulsation (EECP) on radial artery occlusion (RAO) through the oscillatory shear (OS) and pulsatile shear (PS) models of human umbilical vein endothelial cells (HUVECs) and RAO dog models. Methods We used high-throughput sequencing data GSE92506 in GEO database to conduct time-series analysis of functional molecules on OS intervened HUVECs, and then compared the different molecules and their functions between PS and OS. Additionally, we studied the effect of EECP on the radial artery hemodynamics in Labrador dogs through multi-channel physiological monitor. Finally, we studied the therapeutic effect of EECP on RAO at the histological level through Hematoxylin-Eosin staining, Masson staining, ATPase staining and immunofluorescence in nine Labrador dogs. Results With the extension of OS intervention, the cell cycle decreased, blood vessel endothelial cell proliferation and angiogenesis responses of HUVECs were down-regulated. By contrast, the inflammation and oxidative stress responses and the related pathways of anaerobic metabolism of HUVECs were up-regulated. Additionally, we found that compared with OS, PS can significantly up-regulate muscle synthesis, angiogenesis, and NO production related molecules. Meanwhile, PS can significantly down-regulate inflammation and oxidative stress related molecules. The invasive arterial pressure monitoring showed that 30Kpa EECP treatment could significantly increase the radial artery peak pressure (p = 0.030, 95%CI, 7.236-82.524). Masson staining showed that RAO significantly increased muscle interstitial fibrosis (p = 0.002, 95%CI, 0.748-2.128), and EECP treatment can reduce this change (p = 0.011, 95%CI, -1.676 to -0.296). ATPase staining showed that RAO significantly increased the area of type II muscle fibers (p = 0.004, 95%CI, 7.181-25.326), and EECP treatment could reduce this change (p = 0.001, 95%CI, -29.213 to -11.069). In addition, immunofluorescence showed that EECP increased angiogenesis in muscle tissue (p = 0.035, 95%CI, 0.024-0.528). Conclusion EECP improves interstitial fibrosis and hypoxia, and increases angiogenesis of muscle tissue around radial artery induced by RAO.
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Affiliation(s)
- Zhenyu Wang
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Chun Yao
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Lihan Huang
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Jianwen Liang
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Xiaocong Zhang
- Department of Cardiology, Foshan Fosun Chancheng Hospital, Foshan, Guangdong, China
| | - Jian Shi
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Wenbin Wei
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
| | - Jing Zhou
- Department of Cardiology, Affiliated Hospital of Yan’an University, Yan’an, Shaanxi, China
| | - Yahui Zhang
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
- School of Rehabilitation Sciences and Engineering, University of Health and Rehabilitation Sciences, Shandong, China
- Yahui Zhang,
| | - Guifu Wu
- Department of Cardiology, The Eighth Affiliated Hospital of Sun Yat-sen University, Shenzhen, Guangdong, China
- Guangdong Innovative Engineering and Technology Research Center for Assisted Circulation, Sun Yat-sen University, Shenzhen, Guangdong, China
- NHC Key Laboratory of Assisted Circulation, Sun Yat-sen University, Guangzhou, Guangdong, China
- *Correspondence: Guifu Wu,
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Panagiotou E, Millett KC, Atzberger PJ. Topological Methods for Polymeric Materials: Characterizing the Relationship Between Polymer Entanglement and Viscoelasticity. Polymers (Basel) 2019; 11:E437. [PMID: 30960421 PMCID: PMC6473770 DOI: 10.3390/polym11030437] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2019] [Revised: 02/12/2019] [Accepted: 02/26/2019] [Indexed: 12/31/2022] Open
Abstract
We develop topological methods for characterizing the relationship between polymer chain entanglement and bulk viscoelastic responses. We introduce generalized Linking Number and Writhe characteristics that are applicable to open linear chains. We investigate the rheology of polymeric chains entangled into weaves with varying topologies and levels of chain density. To investigate viscoelastic responses, we perform non-equilibrium molecular simulations over a range of frequencies using sheared Lees⁻Edwards boundary conditions. We show how our topological characteristics can be used to capture key features of the polymer entanglements related to the viscoelastic responses. We find there is a linear relation over a significant range of frequencies between the mean absolute Writhe W r and the Loss Tangent tan ( δ ) . We also find an approximate inverse linear relationship between the mean absolute Periodic Linking Number L K P and the Loss Tangent tan ( δ ) . Our results show some of the ways topological methods can be used to characterize chain entanglements to better understand the origins of mechanical responses in polymeric materials.
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Affiliation(s)
- Eleni Panagiotou
- Department of Mathematics and SimCenter, University of Tennessee at Chattanooga, Chattanooga, TN 37403, USA.
| | - Kenneth C Millett
- Department of Mathematics, University of California Santa Barbara, Santa Barbara, CA 93106-3080, USA.
| | - Paul J Atzberger
- Department of Mathematics and Department of Mechanical Engineering, University of California Santa Barbara, Santa Barbara, CA 93106-3080, USA.
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Somani YB, Moore DJ, Kim DJ, Gonzales JU, Barlow MA, Elavsky S, Proctor DN. Retrograde and oscillatory shear increase across the menopause transition. Physiol Rep 2019; 7:e13965. [PMID: 30604931 PMCID: PMC6317059 DOI: 10.14814/phy2.13965] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2018] [Accepted: 11/26/2018] [Indexed: 12/29/2022] Open
Abstract
Declines in endothelial function can take place rapidly across the menopause transition, placing women at heightened risk for atherosclerosis. Disturbed patterns of conduit artery shear, characterized by greater oscillatory and retrograde shear, are associated with endothelial dysfunction but have yet to be described across menopause. Healthy women, who were not on hormone therapy or contraceptives, were classified into early perimenopausal, late perimenopausal, and early postmenopausal stage. Resting antegrade, retrograde, and oscillatory shear were calculated from blood velocity and diameter measured in the brachial and common femoral artery using Doppler ultrasound. Serum was collected for measurements of estradiol, follicle-stimulating hormone (FSH), and luteinizing hormone. After adjusting for age, brachial artery oscillatory shear was significantly higher in early postmenopausal women (n = 15, 0.17 ± 0.08 a.u.) than both early (n = 12, 0.08 ± 0.05 a.u., P < 0.05) and late (n = 8, 0.08 ± 0.04 a.u) perimenopausal women, and retrograde shear was significantly greater in early postmenopausal versus early perimenopausal women (-19.47 ± 12.97 vs. -9.62 ± 6.11 sec-1 , both P < 0.05). Femoral artery oscillatory and retrograde shear were greater, respectively, in early postmenopausal women (n = 15, 0.19 ± 0.08 a.u.; -13.57 ± 5.82 sec-1 ) than early perimenopausal women (n = 14, 0.11 ± 0.08 a.u.; -8.13 ± 4.43 sec-1 , P < 0.05). Further, Pearson correlation analyses revealed significant associations between FSH and both retrograde and oscillatory shear, respectively, in the brachial (r = -0.40, P = 0.03; r = 0.43, P = 0.02) and common femoral artery (r = -0.45, P = 0.01; r = 0.56, P = 0.001). These results suggest menopause, and its associated changes in reproductive hormones, adversely influences conduit arterial shear rate patterns to greater oscillatory and retrograde shear rates.
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Affiliation(s)
- Yasina B. Somani
- Department of KinesiologyPenn State UniversityUniversity ParkPennsylvania
| | | | | | | | | | | | - David N. Proctor
- Department of KinesiologyPenn State UniversityUniversity ParkPennsylvania
- Penn State College of MedicineHersheyPennsylvania
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Wilson MA, Baljon ARC. Microstructural Origins of Nonlinear Response in Associating Polymers under Oscillatory Shear. Polymers (Basel) 2017; 9:E556. [PMID: 30965862 PMCID: PMC6418794 DOI: 10.3390/polym9110556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2017] [Revised: 10/22/2017] [Accepted: 10/24/2017] [Indexed: 11/21/2022] Open
Abstract
The response of associating polymers with oscillatory shear is studied through large-scale simulations. A hybrid molecular dynamics (MD), Monte Carlo (MC) algorithm is employed. Polymer chains are modeled as a coarse-grained bead-spring system. Functionalized end groups, at both ends of the polymer chains, can form reversible bonds according to MC rules. Stress-strain curves show nonlinearities indicated by a non-ellipsoidal shape. We consider two types of nonlinearities. Type I occurs at a strain amplitude much larger than one, type II at a frequency at which the elastic storage modulus dominates the viscous loss modulus. In this last case, the network topology resembles that of the system at rest. The reversible bonds are broken and chains stretch when the system moves away from the zero-strain position. For type I, the chains relax and the number of reversible bonds peaks when the system is near an extreme of the motion. During the movement to the other extreme of the cycle, first a stress overshoot occurs, then a yield accompanied by shear-banding. Finally, the network restructures. Interestingly, the system periodically restores bonds between the same associating groups. Even though major restructuring occurs, the system remembers previous network topologies.
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Affiliation(s)
- Mark A Wilson
- Computational Materials and Data Science, Sandia National Laboratories, Albuquerque, NM 87123, USA.
| | - Arlette R C Baljon
- Department of Physics, San Diego State University, San Diego, CA 92182, USA.
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Abstract
The cell monolayer rheology technique consists of a commercial rotational rheometer that probes the mechanical properties of a monolayer of isolated cells. So far we have described properties of an entire monolayer. In this short communication, we show that we can deduce average single cell properties. Results are in very good agreement with earlier work on single cell mechanics. Our approach provides a mean of 105-106 adherent cells within a single experiment. This makes the results very reproducible. We extend our work on cell adhesion strength and deduce cell adhesion forces of fibroblast cells on fibronectin coated glass substrates.
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Affiliation(s)
- Mathias Sander
- Biological Experimental Physics, Department of Physics FR 7.2, Saarland University, Germany
| | - Julia Flesch
- Biological Experimental Physics, Department of Physics FR 7.2, Saarland University, Germany
| | - Albrecht Ott
- Biological Experimental Physics, Department of Physics FR 7.2, Saarland University, Germany
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Pavlovskaya GE, Meersmann T. Spatial Mapping of Flow-Induced Molecular Alignment in a Noncrystalline Biopolymer Fluid Using Double Quantum Filtered (DQF) (23)Na MRI. J Phys Chem Lett 2014; 5:2632-2636. [PMID: 26277955 DOI: 10.1021/jz501075j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Flow-induced molecular alignment was observed experimentally in a non-liquid-crystalline bioplymeric fluid during developed tubular flow. The fluid was comprised of rigid rods of the polysaccharide xanthan and exhibited shear-thinning behavior. Without a requirement for optical transparency or the need for an added tracer, (23)Na magic angle (MA) double quantum filtered (DQF) magnetic resonance imaging (MRI) enabled the mapping of the anisotropic molecular arrangement under flow conditions. A regional net molecular alignment was found in areas of high shear values in the vicinity of the tube wall. Furthermore, the xanthan molecules resumed random orientations after the cessation of flow. The observed flow-induced molecular alignment was correlated with the rheological properties of the fluid. The work demonstrates the ability of (23)Na MA DQF magnetic resonance to provide a valuable molecular-mechanical link.
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Affiliation(s)
- Galina E Pavlovskaya
- Sir Peter Mansfield Magnetic Resonance Centre, School of Medicine, University of Nottingham, Nottingham NG2 7RD, United Kingdom
| | - Thomas Meersmann
- Sir Peter Mansfield Magnetic Resonance Centre, School of Medicine, University of Nottingham, Nottingham NG2 7RD, United Kingdom
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Marin T, Gongol B, Chen Z, Woo B, Subramaniam S, Chien S, Shyy JYJ. Mechanosensitive microRNAs-role in endothelial responses to shear stress and redox state. Free Radic Biol Med 2013; 64:61-8. [PMID: 23727269 PMCID: PMC3762952 DOI: 10.1016/j.freeradbiomed.2013.05.034] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/01/2012] [Revised: 05/22/2013] [Accepted: 05/23/2013] [Indexed: 12/22/2022]
Abstract
Endothelial functions are highly regulated by imposed shear stress in vivo. The characteristics of shear stress determine mechanotransduction events that regulate phenotypic outcomes including redox and inflammatory states. Recent data indicate that microRNAs (miRs) in vascular endothelial cells play an essential role in shear stress-regulated endothelial responses. More specifically, atheroprotective pulsatile flow (PS) induces miRs that inhibit mediators of oxidative stress and inflammation while promoting those involved in maintaining vascular homeostasis. Conversely, oscillatory flow (OS) elicits the opposing networks. This is exemplified by the PS-responsive transcription factor Krüppel-like factor 2 (KLF2), which regulates miR expression but is also regulated by OS-sensitive miRs to ultimately regulate the oxidative and inflammatory state of the endothelium. In this review, we outline important findings demonstrating the multifaceted roles of shear stress-regulated miRs in endothelial redox and inflammatory balance. Furthermore, we discuss the use of algorithms in deciphering signaling networks differentially regulated by PS and OS.
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Affiliation(s)
- Traci Marin
- Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
| | - Brendan Gongol
- Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
| | - Zhen Chen
- Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093
| | - Brian Woo
- Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
| | - Shankar Subramaniam
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093
| | - Shu Chien
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093
| | - John Y-J Shyy
- Biomedical Sciences, School of Medicine, University of California, Riverside, Riverside, CA 92521
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093
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