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Chandurkar MK, Mittal N, Royer-Weeden SP, Lehmann SD, Rho Y, Han SJ. Low Shear in Short-Term Impacts Endothelial Cell Traction and Alignment in Long-Term. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2023.09.20.558732. [PMID: 37790318 PMCID: PMC10542130 DOI: 10.1101/2023.09.20.558732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Within the vascular system, endothelial cells (ECs) are exposed to fluid shear stress (FSS), a mechanical force exerted by blood flow that is critical for regulating cellular tension and maintaining vascular homeostasis. The way ECs react to FSS varies significantly; while high, laminar FSS supports vasodilation and suppresses inflammation, low or disturbed FSS can lead to endothelial dysfunction and increase the risk of cardiovascular diseases. Yet, the adaptation of ECs to dynamically varying FSS remains poorly understood. This study focuses on the dynamic responses of ECs to brief periods of low FSS, examining its impact on endothelial traction-a measure of cellular tension that plays a crucial role in how endothelial cells respond to mechanical stimuli. By integrating traction force microscopy (TFM) with a custom-built flow chamber, we analyzed how human umbilical vein endothelial cells (HUVECs) adjust their traction in response to shifts from low to high shear stress. We discovered that initial exposure to low FSS prompts a marked increase in traction force, which continues to rise over 10 hours before slowly decreasing. In contrast, immediate exposure to high FSS causes a quick spike in traction followed by a swift reduction, revealing distinct patterns of traction behavior under different shear conditions. Importantly, the direction of traction forces and the resulting cellular alignment under these conditions indicate that the initial shear experience dictates long-term endothelial behavior. Our findings shed light on the critical influence of short-lived low-shear stress experiences in shaping endothelial function, indicating that early exposure to low FSS results in enduring changes in endothelial contractility and alignment, with significant consequences for vascular health and the development of cardiovascular diseases.
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Affiliation(s)
- Mohanish K. Chandurkar
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
| | - Nikhil Mittal
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
| | - Shaina P. Royer-Weeden
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
| | - Steven D. Lehmann
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
| | - Yeonwoo Rho
- Department of Mathematical Sciences, Michigan Technological University, Houghton, MI 49931
| | - Sangyoon J. Han
- Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931
- Health Research Institute, Michigan Technological University, Houghton, MI 49931
- Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, Houghton, MI 49931
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Wang X, Shen Y, Shang M, Liu X, Munn LL. Endothelial mechanobiology in atherosclerosis. Cardiovasc Res 2023; 119:1656-1675. [PMID: 37163659 PMCID: PMC10325702 DOI: 10.1093/cvr/cvad076] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 02/11/2023] [Accepted: 02/21/2023] [Indexed: 05/12/2023] Open
Abstract
Cardiovascular disease (CVD) is a serious health challenge, causing more deaths worldwide than cancer. The vascular endothelium, which forms the inner lining of blood vessels, plays a central role in maintaining vascular integrity and homeostasis and is in direct contact with the blood flow. Research over the past century has shown that mechanical perturbations of the vascular wall contribute to the formation and progression of atherosclerosis. While the straight part of the artery is exposed to sustained laminar flow and physiological high shear stress, flow near branch points or in curved vessels can exhibit 'disturbed' flow. Clinical studies as well as carefully controlled in vitro analyses have confirmed that these regions of disturbed flow, which can include low shear stress, recirculation, oscillation, or lateral flow, are preferential sites of atherosclerotic lesion formation. Because of their critical role in blood flow homeostasis, vascular endothelial cells (ECs) have mechanosensory mechanisms that allow them to react rapidly to changes in mechanical forces, and to execute context-specific adaptive responses to modulate EC functions. This review summarizes the current understanding of endothelial mechanobiology, which can guide the identification of new therapeutic targets to slow or reverse the progression of atherosclerosis.
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Affiliation(s)
- Xiaoli Wang
- Institute of Biomedical Engineering, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
- Department of Cardiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310020, China
| | - Yang Shen
- Institute of Biomedical Engineering, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Min Shang
- Department of Cardiology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang 310020, China
| | - Xiaoheng Liu
- Institute of Biomedical Engineering, West China School of Basic Medical Sciences & Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, China
| | - Lance L Munn
- Steele Laboratories, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114, USA
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3
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Santana Nunez D, Malik AB, Lee Q, Ahn SJ, Coctecon-Murillo A, Lazarko D, Levitan I, Mehta D, Komarova YA. Piezo1 induces endothelial responses to shear stress via soluble adenylyl Cyclase-IP 3R2 circuit. iScience 2023; 26:106661. [PMID: 37168565 PMCID: PMC10164902 DOI: 10.1016/j.isci.2023.106661] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 01/30/2023] [Accepted: 04/07/2023] [Indexed: 05/13/2023] Open
Abstract
Endothelial cells (ECs) continuously sense and adapt to changes in shear stress generated by blood flow. Here, we show that the activation of the mechanosensitive channel Piezo1 by defined shear forces induces Ca2+ entry into the endoplasmic reticulum (ER) via the ER Ca2+ ATPase pump. This entry is followed by inositol trisphosphate receptor 2 (IP3R2)-elicited ER Ca2+ release into the cytosol. The mechanism of ER Ca2+ release involves the generation of cAMP by soluble adenylyl cyclase (sAC), leading to IP3R2-evoked Ca2+ gating. Depleting sAC or IP3R2 prevents ER Ca2+ release and blocks EC alignment in the direction of flow. Overexpression of constitutively active Akt1 restores the shear-induced alignment of ECs lacking Piezo1 or IP3R2, as well as the flow-induced vasodilation in endothelial restricted Piezo1 knockout mice. These studies describe an unknown Piezo1-cAMP-IP3R2 circuit as an essential mechanism activating Akt signaling and inducing adaptive changes in ECs to laminar flow.
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Affiliation(s)
- Dianicha Santana Nunez
- Department of Pharmacology and Regenerative Medicine, the Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL, USA
| | - Asrar B. Malik
- Department of Pharmacology and Regenerative Medicine, the Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL, USA
| | - Quinn Lee
- Department of Pharmacology and Regenerative Medicine, the Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL, USA
| | - Sang Joon Ahn
- Department of Medicine, University of Illinois College of Medicine, Chicago, IL, USA
| | - Arnold Coctecon-Murillo
- Department of Pharmacology and Regenerative Medicine, the Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL, USA
| | - Dana Lazarko
- Department of Medicine, University of Illinois College of Medicine, Chicago, IL, USA
| | - Irena Levitan
- Department of Medicine, University of Illinois College of Medicine, Chicago, IL, USA
| | - Dolly Mehta
- Department of Pharmacology and Regenerative Medicine, the Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL, USA
| | - Yulia A. Komarova
- Department of Pharmacology and Regenerative Medicine, the Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, IL, USA
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Davis MJ, Earley S, Li YS, Chien S. Vascular mechanotransduction. Physiol Rev 2023; 103:1247-1421. [PMID: 36603156 PMCID: PMC9942936 DOI: 10.1152/physrev.00053.2021] [Citation(s) in RCA: 45] [Impact Index Per Article: 45.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 09/26/2022] [Accepted: 10/04/2022] [Indexed: 01/07/2023] Open
Abstract
This review aims to survey the current state of mechanotransduction in vascular smooth muscle cells (VSMCs) and endothelial cells (ECs), including their sensing of mechanical stimuli and transduction of mechanical signals that result in the acute functional modulation and longer-term transcriptomic and epigenetic regulation of blood vessels. The mechanosensors discussed include ion channels, plasma membrane-associated structures and receptors, and junction proteins. The mechanosignaling pathways presented include the cytoskeleton, integrins, extracellular matrix, and intracellular signaling molecules. These are followed by discussions on mechanical regulation of transcriptome and epigenetics, relevance of mechanotransduction to health and disease, and interactions between VSMCs and ECs. Throughout this review, we offer suggestions for specific topics that require further understanding. In the closing section on conclusions and perspectives, we summarize what is known and point out the need to treat the vasculature as a system, including not only VSMCs and ECs but also the extracellular matrix and other types of cells such as resident macrophages and pericytes, so that we can fully understand the physiology and pathophysiology of the blood vessel as a whole, thus enhancing the comprehension, diagnosis, treatment, and prevention of vascular diseases.
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Affiliation(s)
- Michael J Davis
- Department of Medical Pharmacology and Physiology, University of Missouri, Columbia, Missouri
| | - Scott Earley
- Department of Pharmacology, University of Nevada, Reno, Nevada
| | - Yi-Shuan Li
- Department of Bioengineering, University of California, San Diego, California
- Institute of Engineering in Medicine, University of California, San Diego, California
| | - Shu Chien
- Department of Bioengineering, University of California, San Diego, California
- Institute of Engineering in Medicine, University of California, San Diego, California
- Department of Medicine, University of California, San Diego, California
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Wang L, Wang B, Jia L, Yu H, Wang Z, Wei F, Jiang A. Shear stress leads to the dysfunction of endothelial cells through the Cav-1-mediated KLF2/eNOS/ERK signaling pathway under physiological conditions. Open Life Sci 2023; 18:20220587. [PMID: 37077343 PMCID: PMC10106974 DOI: 10.1515/biol-2022-0587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2022] [Revised: 02/07/2023] [Accepted: 02/28/2023] [Indexed: 04/21/2023] Open
Abstract
To investigate the mechanism of shear stress on endothelial cell dysfunction for providing a theoretical basis for the reduction of arteriovenous fistula dysfunction. The in vitro parallel plate flow chamber was used to form different forces and shear stress to mimic the hemodynamic changes in human umbilical vein endothelial cells, and the expression and distribution of krüppel-like factor 2 (KLF2), caveolin-1 (Cav-1), p-extracellular regulated protein kinase (p-ERK), and endothelial nitric oxide synthase (eNOS) were detected by immunofluorescence and real-time quantitative polymerase chain reaction. With the prolongation of the shear stress action time, the expression of KLF2 and eNOS increased gradually, while the expression of Cav-1 and p-ERK decreased gradually. In addition, after cells were exposed to oscillatory shear stress (OSS) and low shear stress, the expression of KLF2, Cav-1, and eNOS decreased and the expression of p-ERK increased. The expression of KLF2 increased gradually with the prolongation of action time, but it was still obviously lower than that of high shear stress. Following the block of Cav-1 expression by methyl β-cyclodextrin, eNOS expression decreased, and KLF2 and p-ERK expression increased. OSS may lead to endothelial cell dysfunction by Cav-1-mediated KLF2/eNOS/ERK signaling pathway.
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Affiliation(s)
- Lihua Wang
- Department of Kidney Disease and Blood Purification Centre, 2nd Hospital of Tianjin Medical University, 23rd, Pingjiang Road, Hexi District, Tianjin300211, China
| | - Bingyue Wang
- Blood Purification Center of Tianjin Third Central Hospital, Tianjin300170, China
| | - Lan Jia
- Department of Kidney Disease and Blood Purification Centre, 2nd Hospital of Tianjin Medical University, 23rd, Pingjiang Road, Hexi District, Tianjin300211, China
| | - Haibo Yu
- Department of Kidney Disease and Blood Purification Centre, 2nd Hospital of Tianjin Medical University, 23rd, Pingjiang Road, Hexi District, Tianjin300211, China
| | - Zhe Wang
- Department of Kidney Disease and Blood Purification Centre, 2nd Hospital of Tianjin Medical University, 23rd, Pingjiang Road, Hexi District, Tianjin300211, China
| | - Fang Wei
- Department of Kidney Disease and Blood Purification Centre, 2nd Hospital of Tianjin Medical University, 23rd, Pingjiang Road, Hexi District, Tianjin300211, China
| | - Aili Jiang
- Department of Kidney Disease and Blood Purification Centre, 2nd Hospital of Tianjin Medical University, 23rd, Pingjiang Road, Hexi District, Tianjin300211, China
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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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Park H, Furtado J, Poulet M, Chung M, Yun S, Lee S, Sessa WC, Franco CA, Schwartz MA, Eichmann A. Defective Flow-Migration Coupling Causes Arteriovenous Malformations in Hereditary Hemorrhagic Telangiectasia. Circulation 2021; 144:805-822. [PMID: 34182767 PMCID: PMC8429266 DOI: 10.1161/circulationaha.120.053047] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
BACKGROUND Activin receptor-like kinase 1 (ALK1) is an endothelial transmembrane serine threonine kinase receptor for BMP family ligands that plays a critical role in cardiovascular development and pathology. Loss-of-function mutations in the ALK1 gene cause type 2 hereditary hemorrhagic telangiectasia, a devastating disorder that leads to arteriovenous malformations. Here, we show that ALK1 controls endothelial cell polarization against the direction of blood flow and flow-induced endothelial migration from veins through capillaries into arterioles. METHODS Using Cre lines that recombine in different subsets of arterial, capillary-venous, or endothelial tip cells, we show that capillary-venous Alk1 deletion was sufficient to induce arteriovenous malformation formation in the postnatal retina. RESULTS ALK1 deletion impaired capillary-venous endothelial cell polarization against the direction of blood flow in vivo and in vitro. Mechanistically, ALK1-deficient cells exhibited increased integrin signaling interaction with vascular endothelial growth factor receptor 2, which enhanced downstream YAP/TAZ nuclear translocation. Pharmacologic inhibition of integrin or YAP/TAZ signaling rescued flow migration coupling and prevented vascular malformations in Alk1-deficient mice. CONCLUSIONS Our study reveals ALK1 as an essential driver of flow-induced endothelial cell migration and identifies loss of flow-migration coupling as a driver of arteriovenous malformation formation in hereditary hemorrhagic telangiectasia disease. Integrin-YAP/TAZ signaling blockers are new potential targets to prevent vascular malformations in patients with hereditary hemorrhagic telangiectasia.
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Affiliation(s)
- Hyojin Park
- Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven CT, USA
| | - Jessica Furtado
- Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven CT, USA
| | - Mathilde Poulet
- Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven CT, USA
| | - Minhwan Chung
- Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven CT, USA
| | - Sanguk Yun
- Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven CT, USA
| | - Sungwoon Lee
- Yale University School of Medicine, Department of Pharmacology, New Haven CT, USA
| | - William C Sessa
- Yale University School of Medicine, Department of Pharmacology, New Haven CT, USA
| | - Claudio A Franco
- Instituto de Medicina Molecular João Lobo Antunes, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
- Instituto de Histologia e Biologia do Desenvolvimento, Faculdade de Medicina, Universidade de Lisboa, Lisboa, Portugal
| | - Martin A Schwartz
- Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven CT, USA
- Yale University School of Medicine, Departments of Cell Biology and Biomedical Engineering, New Haven CT, USA
| | - Anne Eichmann
- Cardiovascular Research Center, Department of Internal Medicine, Yale University School of Medicine, New Haven CT, USA
- Yale University School of Medicine, Department of Molecular and Cellular Physiology, New Haven, CT, USA
- Université de Paris, PARCC, INSERM, F-75006 Paris, France
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8
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β2AR-dependent signaling contributes to in-vivo reendothelialization capacity of endothelial progenitor cells by shear stress. J Hypertens 2020; 38:82-94. [DOI: 10.1097/hjh.0000000000002203] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Li F, Duan J, Zhao M, Huang S, Mu F, Su J, Liu K, Pan Y, Lu X, Li J, Wei P, Xi M, Wen A. A network pharmacology approach to reveal the protective mechanism of Salvia miltiorrhiza-Dalbergia odorifera coupled-herbs on coronary heart disease. Sci Rep 2019; 9:19343. [PMID: 31852981 PMCID: PMC6920415 DOI: 10.1038/s41598-019-56050-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 12/06/2019] [Indexed: 12/12/2022] Open
Abstract
Salvia miltiorrhiza-Dalbergia odorifera coupled-herbs (SMDOCH) has been used to treat coronary heart disease (CHD) for thousands of years, but its unclear bioactive components and mechanisms greatly limit its clinical application. In this study, for the first time, we used network pharmacology to elucidate the mechanisms of action of SMDOCH on CHD. We collected 270 SMDOCH-related targets from 74 bioactive components and 375 CHD-related targets, with 58 overlapping common targets. Next, we performed enrichment analysis for common-target network and protein-protein interaction (PPI) network. The results showed that SMDOCH affected CHD mainly through 10 significant signaling pathways in three biological processes: 'vascular endothelial function regulation', 'inflammatory response', and 'lipid metabolism'. Six pathways belonged to the 'vascular endothelial function regulation' model, which primarily regulated hormone (renin, angiotensin, oestrogen) activity, and included three key upstream pathways that influence vascular endothelial function, namely KEGG:04933, KEGG:05418, and KEGG:04066. Three pathways, namely KEGG:04668, KEGG:04064, and KEGG:04620, belonged to the 'inflammatory response' model. One pathway (KEGG:04920) belonged to the 'lipid metabolism' model. To some extent, this study revealed the potential bioactive components and pharmacological mechanisms of SMDOCH on CHD, and provided a new direction for the development of new drugs for the treatment of CHD.
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Affiliation(s)
- Fei Li
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.,Department of Pharmacy, The Hospital of 92012 Troops, PLA Navy, Zhoushan, Zhejiang, 316000, China
| | - Jialin Duan
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Meina Zhao
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.,College of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang, Shaanxi, 712046, China
| | - Shaojie Huang
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Fei Mu
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Jing Su
- College of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang, Shaanxi, 712046, China
| | - Kedi Liu
- College of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang, Shaanxi, 712046, China
| | - Yang Pan
- Department of Chinese Materia Medical and Natural Medicines, School of Pharmacy, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China
| | - Xinming Lu
- YouYi Clinical Laboratories of Shaanxi, Xi'an, Shaanxi, 710032, China
| | - Jing Li
- YouYi Clinical Laboratories of Shaanxi, Xi'an, Shaanxi, 710032, China
| | - Peifeng Wei
- College of Pharmacy, Shaanxi University of Chinese Medicine, Xianyang, Shaanxi, 712046, China.
| | - Miaomiao Xi
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China. .,TANK Medicinal Biology Institute of Xi'an, Xi'an, Shaanxi, 710032, China.
| | - Aidong Wen
- Department of Pharmacy, Xijing Hospital, Fourth Military Medical University, Xi'an, Shaanxi, 710032, China.
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10
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Dela Paz NG, Frangos JA. Rapid flow-induced activation of Gα q/11 is independent of Piezo1 activation. Am J Physiol Cell Physiol 2019; 316:C741-C752. [PMID: 30811222 PMCID: PMC6580164 DOI: 10.1152/ajpcell.00215.2018] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 02/08/2019] [Accepted: 02/25/2019] [Indexed: 12/22/2022]
Abstract
Endothelial cell (EC) mechanochemical transduction is the process by which mechanical stimuli are sensed by ECs and transduced into biochemical signals and ultimately into physiological responses. Identifying the mechanosensor/mechanochemical transducer(s) and describing the mechanism(s) by which they receive and transmit the signals has remained a central focus within the field. The heterotrimeric G protein, Gαq/11, is proposed to be part of a macromolecular complex together with PECAM-1 at EC junctions and may constitute the mechanochemical transducer as it is rapidly activated within seconds of flow onset. The mechanically activated cation channel Piezo1 has recently been implicated due to its involvement in mediating early responses, such as calcium and ATP release. Here, we investigate the role of Piezo1 in rapid shear stress-induced Gαq/11 activation. We show that flow-induced dissociation of Gαq/11 from PECAM-1 in ECs at 15 s is abrogated by BIM-46187, a selective inhibitor of Gαq/11 activation, suggesting that Gαq/11 activation is required for PECAM-1/Gαq/11 dissociation. Although siRNA knockdown of Piezo1 caused a dramatic decrease in PECAM-1/Gαq/11 association in the basal condition, it had no effect on flow-induced dissociation. Interestingly, siRNA knockdown of Piezo1 caused a marked decrease in PECAM-1 expression. Additionally, selective blockade of Piezo1 with ion channel inhibitors had no effect on flow-induced PECAM-1/Gαq/11 dissociations. Lastly, flow onset caused increased association of Gβ1 with Piezo1 as well as with the p101 subunit of phosphoinositide 3-kinase, which were both blocked by the Gβγ inhibitor gallein. Together, our results indicate that flow-induced activation of Piezo1 is not upstream of G protein activation.
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Affiliation(s)
| | - John A Frangos
- La Jolla Bioengineering Institute , La Jolla, California
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11
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Chitragari G, Shalaby SY, Sumpio BJ, Kurita J, Sumpio BE. Regulation of Yes-Associated Protein by Laminar Flow. Ann Vasc Surg 2018; 52:183-191. [DOI: 10.1016/j.avsg.2018.03.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 01/17/2018] [Accepted: 03/15/2018] [Indexed: 01/29/2023]
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12
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Vaseghi Maghvan P, Rezaei-Tavirani M, Zali H, Nikzamir A, Abdi S, Khodadoostan M, Asadzadeh-Aghdaei H. Network analysis of common genes related to esophageal, gastric, and colon cancers. GASTROENTEROLOGY AND HEPATOLOGY FROM BED TO BENCH 2017; 10:295-302. [PMID: 29379595 PMCID: PMC5758738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
AIM The aim of this study was to provide a biomarker panel for esophageal, gastric and colorectal cancers. It can help introducing some diagnostic biomarkers for these diseases. BACKGROUND Gastrointestinal cancers (GICs) including esophageal, gastric and colorectal cancers are the most common cancers in the world which are usually diagnosed in the final stages and due to heterogeneity of these diseases, the treatments usually are not successful. For this reason, many studies have been conducted to discover predictive biomarkers. METHODS In the present study, 507 genes related to esophageal, gastric and colon cancers were extracted.. The network was constructed by Cytoscape software (version 3.4.0). Then a main component of the network was analyzed considering centrality parameters including degree, betweenness, closeness and stress. Three clusters of the protein network accompanied with their seed nodes were determined by MCODE application in Cytoscape software. Furthermore, Gene Ontology (GO) analysis of the key genes in combination to the seed nodes was performed. RESULTS The network of 17 common differential expressed genes in three esophageal, gastric and colon adenocarcinomas including 1730 nodes and 9188 edges were constructed. Eight crucial genes were determined. Three Clusters of the network were analyzed by GO analysis. CONCLUSION The analyses of common genes of the three cancers showed that there are some common crucial genes including TP53, EGFR, MYC, AKT1, CDKN2A, CCND1 and HSP90AA1 which are tightly related to gastrointestinal cancers and can be predictive biomarkers for these cancers.
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Affiliation(s)
- Padina Vaseghi Maghvan
- Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mostafa Rezaei-Tavirani
- Proteomics Research Center, Faculty of Paramedical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hakimeh Zali
- Proteomics Research Center, Department of Tissue engineering and Applied Cell, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Abdolrahim Nikzamir
- Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Saeed Abdi
- Gastroenterology and Liver Diseases Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mahsa Khodadoostan
- Department of Gastroenterology and Hepatology, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Hamid Asadzadeh-Aghdaei
- Basic and Molecular Epidemiology of Gastrointestinal Disorders Research Center, Research Institute for Gastroenterology and Liver Diseases, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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13
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Xu H, Li Z, Guo Y, Peng X, Qin J. Probing the response of lung tumor cells to inflammatory microvascular endothelial cells on fluidic microdevice. Electrophoresis 2016; 38:311-319. [DOI: 10.1002/elps.201600278] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 08/31/2016] [Accepted: 08/31/2016] [Indexed: 01/14/2023]
Affiliation(s)
- Hui Xu
- State Key Laboratory of Fine Chemicals; Dalian University of Technology; Dalian P. R. China
- Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian P. R. China
| | - Zhongyu Li
- State Key Laboratory of Fine Chemicals; Dalian University of Technology; Dalian P. R. China
- Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian P. R. China
| | - Yaqiong Guo
- Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian P. R. China
| | - Xiaojun Peng
- State Key Laboratory of Fine Chemicals; Dalian University of Technology; Dalian P. R. China
| | - Jianhua Qin
- Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian P. R. China
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Design and Evaluation of a Novel Subatmospheric Pressure Bioreactor for the Preconditioning of Tissue-Engineered Vascular Constructs. Int J Artif Organs 2016; 39:77-83. [DOI: 10.5301/ijao.5000475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/06/2016] [Indexed: 11/20/2022]
Abstract
Purpose The pre-conditioning of tissue-engineered vascular scaffolds with mechanical stimuli is being recognised as an essential step in producing a functional vascular construct. In this study we design and evaluate a novel bioreactor, which exerts a mechanical strain on developing vascular scaffolds via subatmospheric pressure. Methods We design and construct a bioreactor, which exerts subatmospheric pressure via a vacuum assisted closure unit. Vascular scaffolds seeded with human umbilical endothelial cells were evaluated for structural integrity, microbial contamination, cellular viability, von Willebrand factor (VWF) production, cell proliferation and morphology under a range of subatmospheric pressures (75-200mmHg). Results The bioreactor produced sustained subatmospheric pressures, which exerted a mechanical strain on the vascular scaffold. No microbial contamination was found during the study. The structural integrity of the vascular construct was maintained. There was no difference in cellular viability between control or subatmospheric pressure groups (p = 0.817). Cells continued to produce VWF under a range of subatmospheric pressures. Cells subjected to subatmospheric pressures of 125mmHg and 200mmHg exhibited higher levels of growth than cells in atmospheric pressure at 24 (p≤0.016) and 48 hour (p≤0.001). Negative pressure affected cellular morphology, which were more organised, elongated and expanded when exposed to subatmospheric pressure. Conclusions We have constructed and validated a novel subatmospheric bioreactor. The bioreactor maintained a continuous subatmospheric pressure to the vascular scaffolds in a stable, sterile and constant environment. The bioreactor exerted a strain on the vascular sheets, which was shown to alter cellular morphology and enhance cellular proliferation.
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Wang S, Iring A, Strilic B, Albarrán Juárez J, Kaur H, Troidl K, Tonack S, Burbiel JC, Müller CE, Fleming I, Lundberg JO, Wettschureck N, Offermanns S. P2Y₂ and Gq/G₁₁ control blood pressure by mediating endothelial mechanotransduction. J Clin Invest 2015; 125:3077-86. [PMID: 26168216 DOI: 10.1172/jci81067] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Accepted: 05/28/2015] [Indexed: 12/17/2022] Open
Abstract
Elevated blood pressure is a key risk factor for developing cardiovascular diseases. Blood pressure is largely determined by vasodilatory mediators, such as nitric oxide (NO), that are released from the endothelium in response to fluid shear stress exerted by the flowing blood. Previous work has identified several mechanotransduction signaling processes that are involved in fluid shear stress-induced endothelial effects, but how fluid shear stress initiates the response is poorly understood. Here, we evaluated human and bovine endothelial cells and found that the purinergic receptor P2Y2 and the G proteins Gq/G11 mediate fluid shear stress-induced endothelial responses, including [Ca2+]i transients, activation of the endothelial NO synthase (eNOS), phosphorylation of PECAM-1 and VEGFR-2, as well as activation of SRC and AKT. In response to fluid shear stress, endothelial cells released ATP, which activates the purinergic P2Y2 receptor. Mice with induced endothelium-specific P2Y2 or Gq/G11 deficiency lacked flow-induced vasodilation and developed hypertension that was accompanied by reduced eNOS activation. Together, our data identify P2Y2 and Gq/G11 as a critical endothelial mechanosignaling pathway that is upstream of previously described mechanotransduction processes and demonstrate that P2Y2 and Gq/G11 are required for basal endothelial NO formation, vascular tone, and blood pressure.
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Davis CA, Zambrano S, Anumolu P, Allen ACB, Sonoqui L, Moreno MR. Device-Based In Vitro Techniques for Mechanical Stimulation of Vascular Cells: A Review. J Biomech Eng 2015; 137:040801. [DOI: 10.1115/1.4029016] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 11/07/2014] [Indexed: 01/19/2023]
Abstract
The most common cause of death in the developed world is cardiovascular disease. For decades, this has provided a powerful motivation to study the effects of mechanical forces on vascular cells in a controlled setting, since these cells have been implicated in the development of disease. Early efforts in the 1970 s included the first use of a parallel-plate flow system to apply shear stress to endothelial cells (ECs) and the development of uniaxial substrate stretching techniques (Krueger et al., 1971, “An in Vitro Study of Flow Response by Cells,” J. Biomech., 4(1), pp. 31–36 and Meikle et al., 1979, “Rabbit Cranial Sutures in Vitro: A New Experimental Model for Studying the Response of Fibrous Joints to Mechanical Stress,” Calcif. Tissue Int., 28(2), pp. 13–144). Since then, a multitude of in vitro devices have been designed and developed for mechanical stimulation of vascular cells and tissues in an effort to better understand their response to in vivo physiologic mechanical conditions. This article reviews the functional attributes of mechanical bioreactors developed in the 21st century, including their major advantages and disadvantages. Each of these systems has been categorized in terms of their primary loading modality: fluid shear stress (FSS), substrate distention, combined distention and fluid shear, or other applied forces. The goal of this article is to provide researchers with a survey of useful methodologies that can be adapted to studies in this area, and to clarify future possibilities for improved research methods.
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Affiliation(s)
- Caleb A. Davis
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120 e-mail:
| | - Steve Zambrano
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120 e-mail:
| | - Pratima Anumolu
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120 e-mail:
| | - Alicia C. B. Allen
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712-1801 e-mail:
| | - Leonardo Sonoqui
- Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3120 e-mail:
| | - Michael R. Moreno
- Department of Mechanical Engineering, Department of Biomedical Engineering, Texas A&M University, College Station, TX 77843-3123 e-mail:
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dela Paz NG, Melchior B, Shayo FY, Frangos JA. Heparan sulfates mediate the interaction between platelet endothelial cell adhesion molecule-1 (PECAM-1) and the Gαq/11 subunits of heterotrimeric G proteins. J Biol Chem 2014; 289:7413-24. [PMID: 24497640 DOI: 10.1074/jbc.m113.542514] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The endothelial cell-cell junction has emerged as a major cell signaling structure that responds to shear stress by eliciting the activation of signaling pathways. Platelet endothelial cell adhesion molecule-1 (PECAM-1) and heterotrimeric G protein subunits Gαq and 11 (Gαq/11) are junctional proteins that have been independently proposed as mechanosensors. Our previous findings suggest that they form a mechanosensitive junctional complex that discriminates between different flow profiles. The nature of the PECAM-1·Gαq/11 interaction is still unclear although it is likely an indirect association. Here, we investigated the role of heparan sulfates (HS) in mediating this interaction and in regulating downstream signaling in response to flow. Co-immunoprecipitation studies show that PECAM-1·Gαq/11 binding is dramatically decreased by competitive inhibition with heparin, pharmacological inhibition with the HS antagonist surfen, and enzymatic removal of HS chains with heparinase III treatment as well as by site-directed mutagenesis of basic residues within the extracellular domain of PECAM-1. Using an in situ proximity ligation assay, we show that endogenous PECAM-1·Gαq/11 interactions in endothelial cells are disrupted by both competitive inhibition and HS degradation. Furthermore, we identified the heparan sulfate proteoglycan syndecan-1 in complexes with PECAM-1 that are rapidly decreased in response to flow. Finally, we demonstrate that flow-induced Akt activation is attenuated in endothelial cells in which PECAM-1 was knocked down and reconstituted with a binding mutant. Taken together, our results indicate that the PECAM-1·Gαq/11 mechanosensitive complex contains an endogenous heparan sulfate proteoglycan with HS chains that is critical for junctional complex assembly and regulating the flow response.
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