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Doggett TM, Alves NG, Yuan SY, Breslin JW. Sphingosine-1-Phosphate Treatment Can Ameliorate Microvascular Leakage Caused by Combined Alcohol Intoxication and Hemorrhagic Shock. Sci Rep 2017; 7:4078. [PMID: 28642485 PMCID: PMC5481382 DOI: 10.1038/s41598-017-04157-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 05/10/2017] [Indexed: 11/09/2022] Open
Abstract
Fluid resuscitation following hemorrhagic shock is often problematic, with development of prolonged hypotension and edema. In addition, many trauma patients are also intoxicated, which generally worsens outcomes. We directly investigated how alcohol intoxication impacts hemorrhagic shock and resuscitation-induced microvascular leakage using a rat model with intravital microscopic imaging. We also tested the hypothesis that an endothelial barrier-protective bioactive lipid, sphingosine-1-phosphate (S1P), could ameliorate the microvascular leakage following alcohol intoxication plus hemorrhagic shock and resuscitation. Our results show that alcohol intoxication exacerbated hemorrhagic shock and resuscitation-induced hypotension and microvascular leakage. We next found that S1P effectively could reverse alcohol-induced endothelial barrier dysfunction using both cultured endothelial cell monolayer and in vivo models. Lastly, we observed that S1P administration ameliorated hypotension and microvascular leakage following combined alcohol intoxication and hemorrhagic shock, in a dose-related manner. These findings suggest the viability of using agonists that can improve microvascular barrier function to ameliorate trauma-induced hypotension, offering a novel therapeutic opportunity for potentially improving clinical outcomes in patients with multi-hit injuries.
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Affiliation(s)
- Travis M Doggett
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Natascha G Alves
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Sarah Y Yuan
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, USA
| | - Jerome W Breslin
- Department of Molecular Pharmacology and Physiology, Morsani College of Medicine, University of South Florida, Tampa, FL, USA.
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152
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Ke B, Ke X, Wan X, Yang Y, Huang Y, Qin J, Hu C, Shi L. Astragalus polysaccharides attenuates TNF-α-induced insulin resistance via suppression of miR-721 and activation of PPAR-γ and PI3K/AKT in 3T3-L1 adipocytes. Am J Transl Res 2017; 9:2195-2206. [PMID: 28559971 PMCID: PMC5446503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 03/18/2017] [Indexed: 06/07/2023]
Abstract
Insulin resistance is associated with obesity and type 2 diabetes. The aim of this study was to explore the mechanism of how Astragalus Polysaccharides (APS) improves insulin resistance in 3T3-L1 adipocytes. A cell culture model of insulin resistance was established in mature 3T3-L1 adipocytes by treating them with TNF-α, high glucose and insulin. Glucose uptake levels were detected in each group. To determine the mechanism by which APS improves insulin resistance in 3T3-L1 adipocytes, qRT-PCR was used to detect the expression of miR-721, and Western blots were used to detect the expression or activity of PPAR-γ, PAKT, PI3K, AKT, and GLUT4. Immunostaining was used to detect the expression of GLUT4. We successfully madea model of insulin resistance in mature 3T3-L1 adipocytes. APS increased glucose uptake levels in insulin-resistant adipocytes in a dose- and time-dependent manner, and also increased insulin sensitivity. APS suppressed miR-721 with its target gene PPAR-γ in a dose-dependent manner. miR-721 or PPAR inhibitor T0070907 inhibited the expressions of PPAR-γ, pAKT, and GLUT4 and also reduced glucose accumulation. APS attenuated these miR-721- and PPAR-γ-induced changes. APS increased insulin sensitivity by attenuating the effects of miR-721. The PI3K inhibitor wortmannin reduced the APS-increased pAKT, glucose uptake, and GLUT4 levels, and also reduced those levels in the presence of insulin with or without APS. Taken together, our findings suggest that APS promotes glucose uptake and increases insulin sensitivity in 3T3-L1 adipocytes and may involve the miR-721-PPAR-γ-PI3K/AKT-GLUT4 signaling pathway. These might be new therapeutic targets for treating insulin resistance in obesity and diabetes.
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Affiliation(s)
- Bin Ke
- Department of Traditional Chinese Medicine, The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080, Guangdong, China
| | - Xiao Ke
- Department of Cardiology, Shenzhen Sun Yat-sen Cardiovascular HospitalShenzhen 518112, China
| | - Xuesi Wan
- Department of Endocrinology and Diabetes Center, The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080, Guangdong, China
| | - Yubin Yang
- Department of Traditional Chinese Medicine, The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080, Guangdong, China
| | - Yingjuan Huang
- Department of Traditional Chinese Medicine, The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080, Guangdong, China
| | - Jian Qin
- Department of Traditional Chinese Medicine, The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080, Guangdong, China
| | - Chengheng Hu
- Department of Cardiology, The First Affiliated Hospital of Sun Yat-sen UniversityGuangzhou 510080, Guangdong, China
| | - Lin Shi
- Department of Traditional Chinese Medicine, Zhujiang Hospital, Southern Medical UniversityGuangzhou 510280, Guangdong, China
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153
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Stenosis Hemodynamics Disrupt the Endothelial Cell Glycocalyx by MMP Activity Creating a Proinflammatory Environment. Ann Biomed Eng 2017; 45:2234-2243. [PMID: 28474270 DOI: 10.1007/s10439-017-1846-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 04/26/2017] [Indexed: 12/20/2022]
Abstract
Hemodynamic forces are known to be able to induce an inflammatory phenotype in endothelial cells (ECs). The EC glycocalyx (GCX) is a dynamic structure which is regulated in response to different stimuli and hypothesized as an important contributor to the mechanotransduction of wall shear stresses (WSS). In this work, we used a three dimensional in vitro EC culture model with a 50% asymmetric stenosis to investigate degradation of the GCX by increased matrix metalloproteinase (MMP) activity in regions of WSS gradients and how this degradation might create a proinflammatory environment. Experiments showed GCX degradation was observed in regions of WSSGs created by a 50% asymmetric stenosis. Furthermore, inhibition of MMP activity abolished this regional degradation. The integrity of the GCX altered EC morphological elongation to flow and leukocyte adhesion patterns. These results help strengthen the hypothesis that the EC GCX is involved in the mechanotransduction of hemodynamic forces and that the GCX is regulated by MMP activity in regions of WSSGs.
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154
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Fujino Y, Takeishi S, Nishida K, Okamoto K, Muguruma N, Kimura T, Kitamura S, Miyamoto H, Fujimoto A, Higashijima J, Shimada M, Rokutan K, Takayama T. Downregulation of microRNA-100/microRNA-125b is associated with lymph node metastasis in early colorectal cancer with submucosal invasion. Cancer Sci 2017; 108:390-397. [PMID: 28032929 PMCID: PMC5378282 DOI: 10.1111/cas.13152] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/21/2016] [Accepted: 12/25/2016] [Indexed: 12/20/2022] Open
Abstract
A majority of early colorectal cancers (CRCs) with submucosal invasion undergo surgical operation, despite a very low incidence of lymph node metastasis. Our study aimed to identify microRNAs (miRNAs) specifically responsible for lymph node metastasis in submucosal CRCs. MicroRNA microarray analysis revealed that miR‐100 and miR‐125b expression levels were significantly lower in CRC tissues with lymph node metastases than in those without metastases. These results were validated by quantitative real‐time PCR in a larger set of clinical samples. The transfection of a miR‐100 or miR‐125b inhibitor into colon cancer HCT116 cells significantly increased cell invasion, migration, and MMP activity. Conversely, overexpression of miR‐100 or miR‐125b mimics significantly attenuated all these activities but did not affect cell growth. To identify target mRNAs, we undertook a gene expression array analysis of miR‐100‐silenced HCT116 cells as well as negative control cells. The Ingenuity Pathway Analysis, TargetScan software analyses, and subsequent verification of mRNA expression by real‐time PCR identified mammalian target of rapamycin (mTOR) and insulin‐like growth factor 1 receptor (IGF1R) as direct, and Fas and X‐linked inhibitor‐of‐apoptosis protein (XIAP) as indirect candidate targets for miR‐100 involved in lymph node metastasis. Knockdown of each gene by siRNA significantly reduced the invasiveness of HCT116 cells. These data clearly show that downregulation of miR‐100 and miR‐125b is closely associated with lymph node metastasis in submucosal CRC through enhancement of invasion, motility, and MMP activity. In particular, miR‐100 may promote metastasis by upregulating mTOR, IGF1R, Fas, and XIAP as targets. Thus, miR‐100 and miR‐125b may be novel biomarkers for lymph node metastasis of early CRCs with submucosal invasion.
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Affiliation(s)
- Yasuteru Fujino
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Shunsaku Takeishi
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Kensei Nishida
- Department of Pathophysiology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Koichi Okamoto
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Naoki Muguruma
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Tetsuo Kimura
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Shinji Kitamura
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Hiroshi Miyamoto
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Akiko Fujimoto
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Jun Higashijima
- Department of Surgery, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Mitsuo Shimada
- Department of Surgery, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Kazuhito Rokutan
- Department of Pathophysiology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Tetsuji Takayama
- Department of Gastroenterology and Oncology, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
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155
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Lukasz A, Hillgruber C, Oberleithner H, Kusche-Vihrog K, Pavenstädt H, Rovas A, Hesse B, Goerge T, Kümpers P. Endothelial glycocalyx breakdown is mediated by angiopoietin-2. Cardiovasc Res 2017; 113:671-680. [PMID: 28453727 DOI: 10.1093/cvr/cvx023] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Accepted: 01/31/2017] [Indexed: 01/01/2023] Open
Abstract
AIMS The endothelial glycocalyx (eGC), a carbohydrate-rich layer lining the luminal surface of the endothelium, provides a first vasoprotective barrier against vascular leakage and adhesion in sepsis and vessel inflammation. Angiopoietin-2 (Angpt-2), an antagonist of the endothelium-stabilizing receptor Tie2 secreted by endothelial cells, promotes vascular permeability through cellular contraction and junctional disintegration. We hypothesized that Angpt-2 might also mediate the breakdown of the eGC. METHODS AND RESULTS Using confocal and atomic force microscopy, we show that exogenous Angpt-2 induces a rapid loss of the eGC in endothelial cells in vitro. Glycocalyx deterioration involves the specific loss of its main constituent heparan sulphate, paralleled by the secretion of the heparan sulphate-specific heparanase from late endosomal/lysosomal stores. Corresponding in vivo experiments revealed that exogenous Angpt-2 leads to heparanase-dependent eGC breakdown, which contributes to plasma leakage and leukocyte recruitment in vivo. CONCLUSION Our data indicate that eGC breakdown is mediated by Angpt-2 in a non-redundant manner.
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Affiliation(s)
- Alexander Lukasz
- Department of Medicine D, Division of General Internal Medicine, Nephrology, and Rheumatology, University Hospital Münster, Albert-Schweitzer-Campus 1, 48149 Münster, Germany
- Institute of Physiology II, University Hospital Münster, Robert-Koch-Straße 27b, 48149 Münster, Germany
| | - Carina Hillgruber
- Department of Dermatology, University Hospital Münster, Von-Esmarch-Straße 58, 48149 Münster, Germany
| | - Hans Oberleithner
- Institute of Physiology II, University Hospital Münster, Robert-Koch-Straße 27b, 48149 Münster, Germany
| | - Kristina Kusche-Vihrog
- Institute of Physiology II, University Hospital Münster, Robert-Koch-Straße 27b, 48149 Münster, Germany
| | - Hermann Pavenstädt
- Department of Medicine D, Division of General Internal Medicine, Nephrology, and Rheumatology, University Hospital Münster, Albert-Schweitzer-Campus 1, 48149 Münster, Germany
| | - Alexandros Rovas
- Department of Medicine D, Division of General Internal Medicine, Nephrology, and Rheumatology, University Hospital Münster, Albert-Schweitzer-Campus 1, 48149 Münster, Germany
| | - Bettina Hesse
- Department of Medicine D, Division of General Internal Medicine, Nephrology, and Rheumatology, University Hospital Münster, Albert-Schweitzer-Campus 1, 48149 Münster, Germany
- Institute of Physiology II, University Hospital Münster, Robert-Koch-Straße 27b, 48149 Münster, Germany
| | - Tobias Goerge
- Department of Dermatology, University Hospital Münster, Von-Esmarch-Straße 58, 48149 Münster, Germany
| | - Philipp Kümpers
- Department of Medicine D, Division of General Internal Medicine, Nephrology, and Rheumatology, University Hospital Münster, Albert-Schweitzer-Campus 1, 48149 Münster, Germany
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156
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Christoffersen C, Bartels ED, Aarup A, Nielsen LB, Pedersen TX. ApoB and apoM - New aspects of lipoprotein biology in uremia-induced atherosclerosis. Eur J Pharmacol 2017; 816:154-160. [PMID: 28351665 DOI: 10.1016/j.ejphar.2017.03.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2016] [Revised: 01/09/2017] [Accepted: 03/23/2017] [Indexed: 12/27/2022]
Abstract
Chronic kidney disease affects as much as 13% of the population, and is associated with a markedly increased risk of developing cardiovascular disease. One of the underlying reasons is accelerated development of atherosclerosis. This can be ascribed both to increased occurrence of traditional cardiovascular risk factors, and to risk factors that may be unique to patients with chronic kidney disease. The latter is reflected in the observation that the current treatment modalities, mainly directed against traditional risk factors, are insufficient to prevent cardiovascular disease in the patient with chronic kidney disease. This review discusses mechanisms accelerating uremic atherosclerosis with a specific focus on the putative roles of apolipoprotein(apo)s B and M that may be particularly important in patients with chronic kidney disease.
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Affiliation(s)
- Christina Christoffersen
- Department of Clinical Biochemistry, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Oe, Denmark; Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark.
| | - Emil D Bartels
- Department of Clinical Biochemistry, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Oe, Denmark.
| | - Annemarie Aarup
- Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark.
| | - Lars B Nielsen
- Department of Clinical Biochemistry, Rigshospitalet, Blegdamsvej 9, 2100 Copenhagen Oe, Denmark; Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark; Department of Clinical Medicine, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark.
| | - Tanja X Pedersen
- Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3B, 2200 Copenhagen N, Denmark.
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157
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Hsia K, Yang MJ, Chen WM, Yao CL, Lin CH, Loong CC, Huang YL, Lin YT, Lander AD, Lee H, Lu JH. Sphingosine-1-phosphate improves endothelialization with reduction of thrombosis in recellularized human umbilical vein graft by inhibiting syndecan-1 shedding in vitro. Acta Biomater 2017; 51:341-350. [PMID: 28110073 DOI: 10.1016/j.actbio.2017.01.050] [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] [Received: 10/13/2016] [Revised: 01/16/2017] [Accepted: 01/17/2017] [Indexed: 12/31/2022]
Abstract
Sphingosine-1-phosphate (S1P) has been known to promote endothelial cell (EC) proliferation and protect Syndecan-1 (SDC1) from shedding, thereby maintaining this antithrombotic signal. In the present study, we investigated the effect of S1P in the construction of a functional tissue-engineered blood vessel by using human endothelial cells and decellularized human umbilical vein (DHUV) scaffolds. Both human umbilical vein endothelial cells (HUVEC) and human cord blood derived endothelial progenitor cells (EPC) were seeded onto the scaffold with or without the S1P treatment. The efficacy of re-cellularization was determined by using the fluorescent marker CellTracker CMFDA and anti-CD31 immunostaining. The antithrombotic effect of S1P was examined by the anti-aggregation tests measuring platelet adherence and clotting time. Finally, we altered the expression of SDC1, a major glycocalyx protein on the endothelial cell surface, using MMP-7 digestion to explore its role using platelet adhesion tests in vitro. The result showed that S1P enhanced the attachment of HUVEC and EPC. Based on the anti-aggregation tests, S1P-treated HUVEC recellularized vessels when grafted showed reduced thrombus formation compared to controls. Our results also identified reduced SDC1 shedding from HUVEC responsible for inhibition of platelet adherence. However, no significant antithrombogenic effect of S1P was observed on EPC. In conclusion, S1P is an effective agent capable of decreasing thrombotic risk in engineered blood vessel grafts. STATEMENT OF SIGNIFICANCE Sphingosine-1phosphate (S1P) is a low molecular-weight phospholipid mediator that regulates diverse biological activities of endothelial cell, including survival, proliferation, cell barrier integrity, and also influences the development of the vascular system. Based on these characters, we the first time to use it as an additive during the process of a small caliber blood vessel construction by decellularized human umbilical vein and endothelial cell/endothelial progenitor. We further explored the function and mechanism of S1P in promoting revascularization and protection against thrombosis in this tissue engineered vascular grafts. The results showed that S1P could not only accelerate the generation but also reduce thrombus formation of small caliber blood vessel.
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158
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Zeng Y. Endothelial glycocalyx as a critical signalling platform integrating the extracellular haemodynamic forces and chemical signalling. J Cell Mol Med 2017; 21:1457-1462. [PMID: 28211170 PMCID: PMC5542909 DOI: 10.1111/jcmm.13081] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Accepted: 12/02/2016] [Indexed: 12/20/2022] Open
Abstract
The glycocalyx covers the human mammalian cells and plays important roles in stroke, inflammation and atherosclerosis. It has also been shown to be involved in endothelial mechanotransduction of shear stress. Shear stress induces the remodelling of the major component of the glycocalyx including glypican‐1, a cell membrane heparan sulphate proteoglycan. Other factors, such as sphingosine‐1‐phosphate (S1P), protect the glycocalyx against syndecan‐1 ectodomain shedding and induce the synthesis of heparan sulphate. In this study, we reviewed the role of shear stress and S1P in glycocalyx remodelling and revealed that the glycocalyx is a critical signalling platform, integrating the extracellular haemodynamic forces and chemical signalling, such as S1P, for determining the fate of endothelial cells and vascular diseases. This review integrated our current understanding of the structure and function of the glycocalyx and provided new insight into the role of the glycocalyx that might be helpful for investigating the underlying biological mechanisms in certain human diseases, such as atherosclerosis.
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Affiliation(s)
- Ye Zeng
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, China
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159
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Inhibition of Sphingosine-1-phosphate receptors in ischemia reperfusion injured autoimmunity-prone mice. Cell Immunol 2017; 311:63-70. [DOI: 10.1016/j.cellimm.2016.10.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2016] [Revised: 10/07/2016] [Accepted: 10/26/2016] [Indexed: 01/18/2023]
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160
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Glycocalyx Degradation Induces a Proinflammatory Phenotype and Increased Leukocyte Adhesion in Cultured Endothelial Cells under Flow. PLoS One 2016; 11:e0167576. [PMID: 27907146 PMCID: PMC5132265 DOI: 10.1371/journal.pone.0167576] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Accepted: 11/16/2016] [Indexed: 12/30/2022] Open
Abstract
Leukocyte adhesion to the endothelium is an early step in the pathogenesis of atherosclerosis. Effective adhesion requires the binding of leukocytes to their cognate receptors on the surface of endothelial cells. The glycocalyx covers the surface of endothelial cells and is important in the mechanotransduction of shear stress. This study aimed to identify the molecular mechanisms underlying the role of the glycocalyx in leukocyte adhesion under flow. We performed experiments using 3-D cell culture models, exposing human abdominal aortic endothelial cells to steady laminar shear stress (10 dynes/cm2 for 24 hours). We found that with the enzymatic degradation of the glycocalyx, endothelial cells developed a proinflammatory phenotype when exposed to uniform steady shear stress leading to an increase in leukocyte adhesion. Our results show an up-regulation of ICAM-1 with degradation compared to non-degraded controls (3-fold increase, p<0.05) and we attribute this effect to a de-regulation in NF-κB activity in response to flow. These results suggest that the glycocalyx is not solely a physical barrier to adhesion but rather plays an important role in governing the phenotype of endothelial cells, a key determinant in leukocyte adhesion. We provide evidence for how the destabilization of this structure may be an early and defining feature in the initiation of atherosclerosis.
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161
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Abstract
Sepsis affects practically all aspects of endothelial cell (EC) function and is thought to be the key factor in the progression from sepsis to organ failure. Endothelial functions affected by sepsis include vasoregulation, barrier function, inflammation, and hemostasis. These are among other mechanisms often mediated by glycocalyx shedding, such as abnormal nitric oxide metabolism, up-regulation of reactive oxygen species generation due to down-regulation of endothelial-associated antioxidant defenses, transcellular communication, proteases, exposure of adhesion molecules, and activation of tissue factor. This review covers current insight in EC-associated hemostatic responses to sepsis and the EC response to inflammation. The endothelial cell lining is highly heterogeneous between different organ systems and consequently also in its response to sepsis. In this context, we discuss the response of the endothelial cell lining to sepsis in the kidney, liver, and lung. Finally, we discuss evidence as to whether the EC response to sepsis is adaptive or maladaptive. This study is a result of an Acute Dialysis Quality Initiative XIV Sepsis Workgroup meeting held in Bogota, Columbia, between October 12 and 15, 2014.
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162
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Musso G, Cassader M, Cohney S, De Michieli F, Pinach S, Saba F, Gambino R. Fatty Liver and Chronic Kidney Disease: Novel Mechanistic Insights and Therapeutic Opportunities. Diabetes Care 2016; 39:1830-45. [PMID: 27660122 DOI: 10.2337/dc15-1182] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 07/10/2016] [Indexed: 02/03/2023]
Abstract
Chronic kidney disease (CKD) is a risk factor for end-stage renal disease (ESRD) and cardiovascular disease (CVD). ESRD or CVD develop in a substantial proportion of patients with CKD receiving standard-of-care therapy, and mortality in CKD remains unchanged. These data suggest that key pathogenetic mechanisms underlying CKD progression go unaffected by current treatments. Growing evidence suggests that nonalcoholic fatty liver disease (NAFLD) and CKD share common pathogenetic mechanisms and potential therapeutic targets. Common nutritional conditions predisposing to both NAFLD and CKD include excessive fructose intake and vitamin D deficiency. Modulation of nuclear transcription factors regulating key pathways of lipid metabolism, inflammation, and fibrosis, including peroxisome proliferator-activated receptors and farnesoid X receptor, is advancing to stage III clinical development. The relevance of epigenetic regulation in the pathogenesis of NAFLD and CKD is also emerging, and modulation of microRNA21 is a promising therapeutic target. Although single antioxidant supplementation has yielded variable results, modulation of key effectors of redox regulation and molecular sensors of intracellular energy, nutrient, or oxygen status show promising preclinical results. Other emerging therapeutic approaches target key mediators of inflammation, such as chemokines; fibrogenesis, such as galectin-3; or gut dysfunction through gut microbiota manipulation and incretin-based therapies. Furthermore, NAFLD per se affects CKD through lipoprotein metabolism and hepatokine secretion, and conversely, targeting the renal tubule by sodium-glucose cotransporter 2 inhibitors can improve both CKD and NAFLD. Implications for the treatment of NAFLD and CKD are discussed in light of this new therapeutic armamentarium.
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Affiliation(s)
- Giovanni Musso
- Humanitas Gradenigo Hospital, University of Turin, Turin, Italy
| | - Maurizio Cassader
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Solomon Cohney
- Department of Nephrology, Western & Royal Melbourne Hospitals, Melbourne, VIC, Australia
| | - Franco De Michieli
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Silvia Pinach
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Francesca Saba
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Roberto Gambino
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
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163
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Post EH, Kellum JA, Bellomo R, Vincent JL. Renal perfusion in sepsis: from macro- to microcirculation. Kidney Int 2016; 91:45-60. [PMID: 27692561 DOI: 10.1016/j.kint.2016.07.032] [Citation(s) in RCA: 115] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Revised: 07/01/2016] [Accepted: 07/07/2016] [Indexed: 12/16/2022]
Abstract
The pathogenesis of sepsis-associated acute kidney injury is complex and likely involves perfusion alterations, a dysregulated inflammatory response, and bioenergetic derangements. Although global renal hypoperfusion has been the main target of therapeutic interventions, its role in the development of renal dysfunction in sepsis is controversial. The implications of renal hypoperfusion during sepsis probably extend beyond a simple decrease in glomerular filtration pressure, and targeting microvascular perfusion deficits to maintain tubular epithelial integrity and function may be equally important. In this review, we provide an overview of macro- and microcirculatory dysfunction in experimental and clinical sepsis and discuss relationships with kidney oxygenation, metabolism, inflammation, and function.
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Affiliation(s)
- Emiel Hendrik Post
- Department of Intensive Care, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium
| | - John A Kellum
- Center for Critical Care Nephrology, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Rinaldo Bellomo
- Centre for Integrated Critical Care, School of Medicine, The University of Melbourne, Parkville, Melbourne, Australia
| | - Jean-Louis Vincent
- Department of Intensive Care, Erasme University Hospital, Université Libre de Bruxelles, Brussels, Belgium.
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164
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Abstract
SIGNIFICANCE Forces are important in the cardiovascular system, acting as regulators of vascular physiology and pathology. Residing at the blood vessel interface, cells (endothelial cell, EC) are constantly exposed to vascular forces, including shear stress. Shear stress is the frictional force exerted by blood flow, and its patterns differ based on vessel geometry and type. These patterns range from uniform laminar flow to nonuniform disturbed flow. Although ECs sense and differentially respond to flow patterns unique to their microenvironment, the mechanisms underlying endothelial mechanosensing remain incompletely understood. RECENT ADVANCES A large body of work suggests that ECs possess many mechanosensors that decorate their apical, junctional, and basal surfaces. These potential mechanosensors sense blood flow, translating physical force into biochemical signaling events. CRITICAL ISSUES Understanding the mechanisms by which proposed mechanosensors sense and respond to shear stress requires an integrative approach. It is also critical to understand the role of these mechanosensors not only during embryonic development but also in the different vascular beds in the adult. Possible cross talk and integration of mechanosensing via the various mechanosensors remain a challenge. FUTURE DIRECTIONS Determination of the hierarchy of endothelial mechanosensors is critical for future work, as is determination of the extent to which mechanosensors work together to achieve force-dependent signaling. The role and primary sensors of shear stress during development also remain an open question. Finally, integrative approaches must be used to determine absolute mechanosensory function of potential mechanosensors. Antioxid. Redox Signal. 25, 373-388.
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Affiliation(s)
- Chris Givens
- 1 Department of Cell Biology and Physiology, University of North Carolina-Chapel Hill , Chapel Hill, North Carolina
| | - Ellie Tzima
- 1 Department of Cell Biology and Physiology, University of North Carolina-Chapel Hill , Chapel Hill, North Carolina.,2 Cardiovascular Medicine, Wellcome Trust Centre for Human Genetics , Oxford, United Kingdom
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165
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Lim NSJ, Sham A, Chee SML, Chan C, Raghunath M. Combination of ciclopirox olamine and sphingosine-1-phosphate as granulation enhancer in diabetic wounds. Wound Repair Regen 2016; 24:795-809. [DOI: 10.1111/wrr.12463] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 07/05/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Natalie Sheng Jie Lim
- Institute of Medical Biology, Biomedical Research Council, Agency for Science, Technology and Research, (A*STAR)
- Department of Biomedical Engineering; National University of Singapore
- NUS Tissue Engineering Programme; Life Sciences Institute, National University of Singapore
| | - Adeline Sham
- Institute of Medical Biology, Biomedical Research Council, Agency for Science, Technology and Research, (A*STAR)
- Department of Biomedical Engineering; National University of Singapore
- NUS Tissue Engineering Programme; Life Sciences Institute, National University of Singapore
| | - Stella Min Ling Chee
- Institute of Medical Biology, Biomedical Research Council, Agency for Science, Technology and Research, (A*STAR)
- Department of Biomedical Engineering; National University of Singapore
- NUS Tissue Engineering Programme; Life Sciences Institute, National University of Singapore
| | - Casey Chan
- Department of Biomedical Engineering; National University of Singapore
- Department of Orthopedic Surgery; Yong Loo Ling School of Medicine, National University of Singapore; Singapore
| | - Michael Raghunath
- Institute of Medical Biology, Biomedical Research Council, Agency for Science, Technology and Research, (A*STAR)
- Department of Biomedical Engineering; National University of Singapore
- NUS Tissue Engineering Programme; Life Sciences Institute, National University of Singapore
- Department of Biochemistry; Yong Loo Ling School of Medicine, National University of Singapore
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166
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Cancel LM, Ebong EE, Mensah S, Hirschberg C, Tarbell JM. Endothelial glycocalyx, apoptosis and inflammation in an atherosclerotic mouse model. Atherosclerosis 2016; 252:136-146. [PMID: 27529818 DOI: 10.1016/j.atherosclerosis.2016.07.930] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 07/20/2016] [Accepted: 07/28/2016] [Indexed: 02/05/2023]
Abstract
BACKGROUND AND AIMS Previous experiments suggest that both increased endothelial cell apoptosis and endothelial surface glycocalyx shedding could play a role in the endothelial dysfunction and inflammation of athero-prone regions of the vasculature. We sought to elucidate the possibly synergistic mechanisms by which endothelial cell apoptosis and glycocalyx shedding promote atherogenesis. METHODS 4- to 6-week old male C57Bl/6 apolipoprotein E knockout (ApoE(-/-)) mice were fed a Western diet for 10 weeks and developed plaques in their brachiocephalic arteries. RESULTS Glycocalyx coverage and thickness were significantly reduced over the plaque region compared to the non-plaque region (coverage plaque: 71 ± 23%, non-plaque: 97 ± 3%, p = 0.02; thickness plaque: 0.85 ± 0.15 μm, non-plaque: 1.2 ± 0.21 μm, p = 0.006). Values in the non-plaque region were not different from those found in wild type mice fed a normal diet (coverage WT: 92 ± 3%, p = 0.7 vs. non-plaque ApoE(-/-), thickness WT: 1.1 ± 0.06 μm, p = 0.2 vs. non-plaque ApoE(-/-)). Endothelial cell apoptosis was significantly increased in ApoE(-/-) mice compared to wild type mice (ApoE(-/-):64.3 ± 33.0, WT: 1.1 ± 0.5 TUNEL-pos/cm, p = 2 × 10(-7)). The number of apoptotic endothelial cells per unit length was 2 times higher in the plaque region than in the non-plaque region of the same vessel (p = 3 × 10(-5)). Increased expression of matrix metalloproteinase 9 co-localized with glycocalyx shedding and plaque buildup. CONCLUSIONS Our results suggest that, in concert with endothelial apoptosis that increases lipid permeability, glycocalyx shedding initiated by inflammation facilitates monocyte adhesion and macrophage infiltration that promote lipid retention and the development of atherosclerotic plaques.
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Affiliation(s)
- Limary M Cancel
- Department of Biomedical Engineering, The City College of New York, New York, NY, USA.
| | - Eno E Ebong
- Department of Biomedical Engineering, The City College of New York, New York, NY, USA; Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Solomon Mensah
- Department of Biomedical Engineering, The City College of New York, New York, NY, USA
| | - Carly Hirschberg
- Graduate Division Summer Undergraduate Research Program, Albert Einstein College of Medicine, Bronx, NY, USA
| | - John M Tarbell
- Department of Biomedical Engineering, The City College of New York, New York, NY, USA.
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167
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Musso G, Cassader M, Cohney S, Pinach S, Saba F, Gambino R. Emerging Liver-Kidney Interactions in Nonalcoholic Fatty Liver Disease. Trends Mol Med 2016; 21:645-662. [PMID: 26432021 DOI: 10.1016/j.molmed.2015.08.005] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Revised: 08/07/2015] [Accepted: 08/16/2015] [Indexed: 12/12/2022]
Abstract
Mounting evidence connects non-alcoholic fatty liver disease (NAFLD) to chronic kidney disease (CKD). We review emerging mechanistic links between NAFLD and CKD, including altered activation of angiotensin converting enzyme (ACE)-2, nutrient/energy sensors sirtuin-1 and AMP-activated kinase, as well as impaired antioxidant defense mediated by nuclear factor erythroid 2-related factor-2 (Nrf2). Dietary fructose excess may also contribute to NAFLD and CKD. NAFLD affects renal injury through lipoprotein dysmetabolism and altered secretion of the hepatokines fibroblast growth factor-21, fetuin-A, insulin-like growth factor-1, and syndecan-1. CKD may mutually aggravate NAFLD and associated metabolic disturbances through altered intestinal barrier function and microbiota composition, the accumulation of uremic toxic metabolites, and alterations in pre-receptor glucocorticoid metabolism. We conclude by discussing the implications of these findings for the treatment of NAFLD and CKD.
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Affiliation(s)
| | - Maurizio Cassader
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Solomon Cohney
- Department of Nephrology, Royal Melbourne and Western Hospital, Victoria, University of Melbourne, Melbourne, Australia
| | - Silvia Pinach
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Francesca Saba
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
| | - Roberto Gambino
- Department of Medical Sciences, San Giovanni Battista Hospital, University of Turin, Turin, Italy
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168
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Abstract
Cells are covered by a surface layer of glycans that is referred to as the 'glycocalyx'. In this review, we focus on the role of the glycocalyx in vascular diseases (atherosclerosis, stroke, hypertension, kidney disease and sepsis) and cancer. The glycocalyx and its principal glycosaminoglycans [heparan sulphate (HS) and hyaluronic acid (HA)] and core proteins (syndecans and glypicans) are degraded in vascular diseases, leading to a breakdown of the vascular permeability barrier, enhanced access of leucocytes to the arterial intima that propagate inflammation and alteration of endothelial mechanotransduction mechanisms that protect against disease. By contrast, the glycocalyx on cancer cells is generally robust, promoting integrin clustering and growth factor signalling, and mechanotransduction of interstitial flow shear stress that is elevated in tumours to upregulate matrix metalloproteinase release which enhances cell motility and metastasis. HS and HA are consistently elevated on cancer cells and are associated with tumour growth and metastasis. Later, we will review the agents that might be used to enhance or protect the glycocalyx to combat vascular disease, as well as a different set of compounds that can degrade the cancer cell glycocalyx to suppress cell growth and metastasis. It is clear that what is beneficial for either vascular disease or cancer will not be so for the other. The overarching conclusions are that (i) the importance of the glycocalyx in human medicine is only beginning to be recognized, and (ii) more detailed studies of glycocalyx involvement in vascular diseases and cancer will lead to novel treatment modalities.
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Affiliation(s)
- J M Tarbell
- Department of Biomedical Engineering, The City College of New York, New York, NY, USA
| | - L M Cancel
- Department of Biomedical Engineering, The City College of New York, New York, NY, USA
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169
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Abstract
Human serum albumin (HSA) is the predominant product of hepatic protein synthesis and one of the more abundant plasma proteins. HSA is a monomeric multidomain macromolecule, representing the main determinant of plasma oncotic pressure and the main modulator of fluid distribution between body compartments. HSA displays an essential role in maintaining the integrity of the vascular barrier. HSA is the most important antioxidant capacity of human plasma, in addition to its ability to protect the body from the harmful effects of heavy metals such as iron and copper and reduce their ability to produce reactive oxygen radicals. HSA is the main depot for nitric oxide (NO) transport in the blood. HSA represents the main carrier for fatty acids, affects pharmacokinetics of many drugs, and provides the metabolic modification of some drugs and displays pseudo-enzymatic properties. HSA has been widely used successfully for more than 50 years in many settings of perioperative medicine including hypovolemia, shock, burns, surgical blood loss, sepsis, and acute respiratory distress syndrome (ARDS). Recently, the use of HSA has shown a promising neuroprotective effect in patients with subarachnoid hemorrhage. The most recent evidence-based functions and uses of HSA in the perioperative period are reviewed in this chapter.
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Affiliation(s)
- Ehab Farag
- grid.254293.b0000000404350569Cleveland Clinic Lerner College of Medicine Director of Clinical Research Staff Anesthesiologist General Anesthesia and Outcomes Research Cleveland Clinic, Cleveland, Ohio USA
| | - Andrea Kurz
- grid.254293.b0000000404350569Cleveland Clinic Lerner College of Medicine Chairman of General Anesthesia Cleveland Clinic, Cleveland, Ohio USA
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170
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Insights into the molecular roles of heparan sulfate proteoglycans (HSPGs—syndecans) in autocrine and paracrine growth factor signaling in the pathogenesis of Hodgkin’s lymphoma. Tumour Biol 2016; 37:11573-11588. [DOI: 10.1007/s13277-016-5118-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 06/09/2016] [Indexed: 12/25/2022] Open
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171
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Cao YL, Duan Y, Zhu LX, Zhan YN, Min SX, Jin AM. TGF-β1, in association with the increased expression of connective tissue growth factor, induce the hypertrophy of the ligamentum flavum through the p38 MAPK pathway. Int J Mol Med 2016; 38:391-8. [PMID: 27279555 PMCID: PMC4935458 DOI: 10.3892/ijmm.2016.2631] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 05/26/2016] [Indexed: 01/15/2023] Open
Abstract
Hypertrophy of the ligamentum flavum (LF) is one of the key pathomechanisms of lumbar spinal stenosis (LSS). Transforming growth factor (TGF)-β1 is abundantly expressed in hypertrophied degenerative LF tissues from LSS. However, the molecular mechanisms underling the association between TGF-β1 and LF hypertrophy have not yet been fully elucidated. In this study, we investigated the important role of the mitogen-activated protein kinase (MAPK) pathway in the pathogenesis of LSS by analyzing the expression of connective tissue growth factor (CTGF) and extracellular matrix (ECM) components (collagen I and collagen III) in TGF-β1-treated LF cells. Cell growth assay revealed that TGF-β1, in association with CTGF, enhanced the the proliferation of LF cells, and we found that TGF-β1 also elevated CTGF expression and subsequently enhanced the mRNA expression of collagen I and collagen III. The increased mRNA expression levels of CTGF, collagen I and collagen III were abolished by p38 inhibitors. Both immunofluorescence imaging and western blot analysis of p38 and p-p38 revealed the increased expression and phosphorylation of p38. Silencing the expression of p38 by siRNA in LF cells decreased the protein expression of p38, p-p38 and CTGF, as well as the mRNA expression of CTGF, collagen I and collagen III. Taken together, our findings indicate that TGF-β1, in association with the increased expression of CTGF, contribute to the homeostasis of the ECM and to the hypertrophy of LF through the p38 MAPK pathway.
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Affiliation(s)
- Yan-Lin Cao
- Department of Orthopaedic Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China
| | - Yang Duan
- Department of Orthopaedic Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China
| | - Li-Xin Zhu
- Department of Orthopaedic Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China
| | - Ye-Nan Zhan
- Department of Neurosurgery, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China
| | - Shao-Xiong Min
- Department of Orthopaedic Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China
| | - An-Min Jin
- Department of Orthopaedic Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China
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172
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Zeng YE, Yao XH, Yan ZP, Liu JX, Liu XH. Potential signaling pathway involved in sphingosine-1-phosphate-induced epithelial-mesenchymal transition in cancer. Oncol Lett 2016; 12:379-382. [PMID: 27347154 DOI: 10.3892/ol.2016.4661] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Accepted: 05/24/2016] [Indexed: 12/19/2022] Open
Abstract
The developmental process of epithelial-mesenchymal transition (EMT) occurs when epithelial cells acquire invasive mesenchymal cell characteristics, and the activation of this process has been indicated to be involved in tumor progression. EMT could be induced by growth factors, cytokines and matrix metalloproteinases (MMPs). sphingosine-1-phosphate (S1P) is a biologically-active lipid that plays an important role in cancer metastasis. S1P also contributes to the activation of EMT. However, the mechanism underlying S1P-induced EMT is unclear. Increased evidence has demonstrated that the cell surface glycocalyx is closed associated with S1P and plays an important role in tumor progression, suggesting that S1P-induced EMT could be Snail-MMP signaling-dependent. Thus, we hypothesize that an S1P-glycocalyx-Snail-MMP signaling axis mediates S1P-induced EMT. This is an essential step towards improved understanding of the underlying mechanism involved in S1P-regulted EMT, and the development of novel diagnostic and anticancer therapeutic strategies.
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Affiliation(s)
- Y E Zeng
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Xing-Hong Yao
- State Key Laboratory of Oncology in South China, Department of Radiation Oncology, Sun Yat-Sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China
| | - Zhi-Ping Yan
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Jing-Xia Liu
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
| | - Xiao-Heng Liu
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, Sichuan 610041, P.R. China
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173
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Torres Filho IP, Torres LN, Salgado C, Dubick MA. Plasma syndecan-1 and heparan sulfate correlate with microvascular glycocalyx degradation in hemorrhaged rats after different resuscitation fluids. Am J Physiol Heart Circ Physiol 2016; 310:H1468-78. [DOI: 10.1152/ajpheart.00006.2016] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 03/31/2016] [Indexed: 01/24/2023]
Abstract
The endothelial glycocalyx plays an essential role in many physiological functions and is damaged after hemorrhage. Fluid resuscitation may further change the glycocalyx after an initial hemorrhage-induced degradation. Plasma levels of syndecan-1 and heparan sulfate have been used as indirect markers for glycocalyx degradation, but the extent to which these measures are representative of the events in the microcirculation is unknown. Using hemorrhage and a wide range of resuscitation fluids, we studied quantitatively the relationship between plasma biomarkers and changes in microvascular parameters, including glycocalyx thickness. Rats were bled 40% of total blood volume and resuscitated with seven different fluids (fresh whole blood, blood products, and crystalloids). Intravital microscopy was used to estimate glycocalyx thickness in >270 postcapillary venules from 58 cremaster preparations in 9 animal groups; other microvascular parameters were measured using noninvasive techniques. Systemic physiological parameters and blood chemistry were simultaneously collected. Changes in glycocalyx thickness were negatively correlated with changes in plasma levels of syndecan-1 ( r = −0.937) and heparan sulfate ( r = −0.864). Changes in microvascular permeability were positively correlated with changes in both plasma biomarkers ( r = 0.8, P < 0.05). Syndecan-1 and heparan sulfate were also positively correlated ( r = 0.7, P < 0.05). Except for diameter and permeability, changes in local microcirculatory parameters (red blood cell velocity, blood flow, and wall shear rate) did not correlate with plasma biomarkers or glycocalyx thickness changes. This work provides a quantitative framework supporting plasma syndecan-1 and heparan sulfate as valuable clinical biomarkers of glycocalyx shedding that may be useful in guiding resuscitation strategies following hemorrhage.
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Affiliation(s)
- Ivo P. Torres Filho
- Damage Control Resuscitation, US Army Institute of Surgical Research, Fort Sam Houston, Texas
| | - Luciana N. Torres
- Damage Control Resuscitation, US Army Institute of Surgical Research, Fort Sam Houston, Texas
| | - Christi Salgado
- Damage Control Resuscitation, US Army Institute of Surgical Research, Fort Sam Houston, Texas
| | - Michael A. Dubick
- Damage Control Resuscitation, US Army Institute of Surgical Research, Fort Sam Houston, Texas
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174
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Schött U, Solomon C, Fries D, Bentzer P. The endothelial glycocalyx and its disruption, protection and regeneration: a narrative review. Scand J Trauma Resusc Emerg Med 2016; 24:48. [PMID: 27068016 PMCID: PMC4828893 DOI: 10.1186/s13049-016-0239-y] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Accepted: 04/06/2016] [Indexed: 12/31/2022] Open
Abstract
The glycocalyx is a carbohydrate-rich layer that lines the luminal side of the vascular endothelium. Its soluble components exist in a dynamic equilibrium with the bloodstream and play an important role in maintaining endothelial layer integrity. However, the glycocalyx can be easily damaged and is extremely vulnerable to insults from a variety of sources, including inflammation, trauma, haemorrhagic shock, hypovolemia and ischaemia-reperfusion. Damage to the glycocalyx commonly precedes further damage to the vascular endothelium. Preclinical research has identified a number of different factors capable of protecting or regenerating the glycocalyx. Initial investigations suggest that plasma may convey protective and regenerative effects. However, it remains unclear which exact components or properties of plasma are responsible for this protective effect. Studies have reported protective effects for several plasma proteins individually, including antithrombin, orosomucoid and albumin; the latter of which may be of particular interest, due to the high levels of albumin present in plasma. A further possibility is that plasma is simply a better intravascular volume expander than other resuscitation fluids. It has also been proposed that the protective effects are mediated indirectly via plasma resuscitation-induced changes in gene expression. Further work is needed to determine the importance of specific plasma proteins or other factors for glycocalyx protection, particularly in a clinical setting.
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Affiliation(s)
- Ulf Schött
- Department of Clinical Sciences Lund, Medical Faculty, University of Lund, Lund, Sweden. .,Department of Intensive and Perioperative Care, Skane University Hospital, Lund, Sweden.
| | - Cristina Solomon
- Department of Anesthesiology, Perioperative Medicine and General Intensive Care, Paracelsus Medical University, Salzburg, Austria.,CSL Behring, Marburg, Germany
| | - Dietmar Fries
- Department of Surgical and General Critical Care Medicine, Medical University Innsbruck, Innsbruck, Austria
| | - Peter Bentzer
- Department of Clinical Sciences Lund, Medical Faculty, University of Lund, Lund, Sweden.,Department of Intensive and Perioperative Care, Skane University Hospital, Lund, Sweden
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175
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Colbert JF, Schmidt EP. Endothelial and Microcirculatory Function and Dysfunction in Sepsis. Clin Chest Med 2016; 37:263-75. [PMID: 27229643 DOI: 10.1016/j.ccm.2016.01.009] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The microcirculation is a series of arterioles, capillaries, and venules that performs essential functions of oxygen and nutrient delivery, customized to the unique physiologic needs of the supplied organ. The homeostatic microcirculatory response to infection can become harmful if overactive and/or dysregulated. Pathologic microcirculatory dysfunction can be directly visualized by intravital microscopy or indirectly measured via detection of circulating biomarkers. Although several treatments have been shown to protect the microcirculation during sepsis, they have not improved patient outcomes when applied indiscriminately. Future outcomes-oriented studies are needed to test sepsis therapeutics when personalized to a patient's microcirculatory dysfunction.
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Affiliation(s)
- James F Colbert
- Division of Infectious Diseases, Department of Medicine, University of Colorado School of Medicine, 12700 E. 19th Avenue, Aurora, CO 80045, USA
| | - Eric P Schmidt
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, Denver Health Medical Center, University of Colorado School of Medicine, 12700 E. 19th Avenue, Aurora, CO 80045, USA.
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176
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Nelson A, Statkevicius S, Schött U, Johansson PI, Bentzer P. Effects of fresh frozen plasma, Ringer's acetate and albumin on plasma volume and on circulating glycocalyx components following haemorrhagic shock in rats. Intensive Care Med Exp 2016; 4:6. [PMID: 26940500 PMCID: PMC4777969 DOI: 10.1186/s40635-016-0080-7] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Accepted: 02/26/2016] [Indexed: 12/18/2022] Open
Abstract
Background Early use of fresh frozen plasma (FFP) in haemorrhagic shock is associated with improved outcome. This effect may partly be due to protection of the endothelial glycocalyx and/or secondary to a superior efficacy of FFP as a plasma volume expander compared to crystalloids. The objective of the present study was to investigate if protection of the glycocalyx by FFP can be demonstrated when potential differences in plasma volume (PV) following resuscitation are accounted for. Methods Rats were subjected to a volume-controlled haemorrhage (30 ml/kg). At 2.5 h after haemorrhage, animals were randomized to resuscitation with FFP (37.5 ml/kg), albumin (30 ml/kg) or Ringer’s acetate (RA) (135 ml/kg, 4.5 times the bleed volume). PV was measured 2 h after completion of resuscitation using 125I-albumin and effects on endothelial glycocalyx were evaluated by measuring circulating heparan sulphate and syndecan-1. Hemodynamic effects of resuscitation were evaluated by measuring lactate and mean arterial pressure (MAP). Results Resuscitation with FFP or albumin resulted in plasma volume expansion equalling the blood loss (to 55 ± 5 ml/kg and 54 ± 4 ml/kg (mean ± S.D.), respectively), whereas plasma volume expansion in RA group was lower (to 42 ± 7 ml/kg). Plasma concentration of heparan sulphate was lower in the FFP and albumin groups than in the RA group at 2 h after resuscitation. After correcting for differences in plasma volume, no significant difference in circulating amount of heparan sulphate was detected between the FFP and albumin groups (2879 ± 1075 μg/kg and 3318 ± 1814 μg/kg, respectively, P = 0.4) and the RA group (3731 ± 777 μg/kg). No differences between the groups in plasma concentration or amount of circulating syndecan-1 were detected after resuscitation. After resuscitation, MAP was higher in the FFP and albumin groups than in the RA group. Lactate did not differ between the FFP and RA groups after resuscitation. Conclusions Improved outcome in trauma by FFP could in part be explained by better plasma volume expansion compared to crystalloids. The decrease in plasma concentration of markers of glycocalyx degradation after resuscitation with FFP are largely secondary to differences in plasma volume and may not accurately reflect effects of FFP on the glycocalyx.
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Affiliation(s)
- Axel Nelson
- Department of Clinical Sciences, Section of Anaesthesiology and Intensive Care, Lund University and Skane University Hospital, Lund, Sweden.
| | - Svajunas Statkevicius
- Department of Clinical Sciences, Section of Anaesthesiology and Intensive Care, Lund University and Skane University Hospital, Lund, Sweden.
| | - Ulf Schött
- Department of Clinical Sciences, Section of Anaesthesiology and Intensive Care, Lund University and Skane University Hospital, Lund, Sweden.
| | - Pär I Johansson
- Section for Transfusion Medicine, Capital Region Blood Bank, Rigshospitalet, Copenhagen, Denmark. .,Department of Surgery, University of Texas Health Medical School, Houston, TX, USA.
| | - Peter Bentzer
- Department of Anesthesia and Intensive Care, Helsingborg Hospital, Helsingborg and Lund University, Lund, SE-251 87, Sweden.
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177
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Wong YL, Lautenschläger I, Zitta K, Schildhauer C, Parczany K, Röcken C, Steinfath M, Weiler N, Albrecht M. Adverse effects of hydroxyethyl starch (HES 130/0.4) on intestinal barrier integrity and metabolic function are abrogated by supplementation with Albumin. J Transl Med 2016; 14:60. [PMID: 26920368 PMCID: PMC4769564 DOI: 10.1186/s12967-016-0810-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 02/07/2016] [Indexed: 12/29/2022] Open
Abstract
Background Volume resuscitation with hydroxyethyl starch (HES) is controversially discussed and we recently showed that HES perfusion impairs endothelial and epithelial intestinal barrier integrity. Here we investigated whether Albumin containing HES solutions are superior to HES alone in maintaining intestinal barrier function. Methods An isolated perfused model of the mouse small intestine was used to investigate the effects of: (i) 3 % Albumin (Alb), (ii) 3 % HES or (iii) 1.5 % HES/1.5 % Albumin (HES/Alb). Intestinal morphology, cell damage, metabolic functions, fluid shifts and endothelial/epithelial barrier permeability were evaluated. Potentially involved signaling mechanisms (Erk1/2, Akt and Stat5 phosphorylation) were screened. Results HES induced histomorphological damage (p < 0.01 vs. Alb), by trend elevated the amount of luminal intestinal fatty acid binding protein and reduced galactose uptake (p < 0.001 vs. Alb). Luminal and lymphatic flow rates were increased (p < 0.001 vs. Alb), while vascular flow was decreased (p < 0.001 vs. Alb) during HES perfusion. HES also increased the vascular to luminal FITC-dextran transfer (p < 0.001 vs. Alb), pointing towards a fluid shift from the vascular to the luminal and lymphatic compartments during HES perfusion. Addition of Alb (HES/Alb) reversed all adverse effects of HES (p < 0.05 vs. HES), restored barrier integrity (p < 0.05 vs. HES) and improved metabolic function of the intestine (p < 0.001 vs. HES; p < 0.05 vs. Alb). Mechanistically, HES/Alb perfusion resulted in an increased phosphorylation of Erk1/2 and Akt kinases (p < 0.001 vs. HES), while Stat5 remained unchanged. Conclusions Albumin supplementation abrogates the adverse effects of HES in the intestine and underlying mechanism may function via phosphorylation of Erk1/2 and Akt. Albumin containing HES solutions are superior to HES alone and may improve the suitability of HES in the clinic. Electronic supplementary material The online version of this article (doi:10.1186/s12967-016-0810-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yuk Lung Wong
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
| | - Ingmar Lautenschläger
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
| | - Karina Zitta
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
| | - Christin Schildhauer
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
| | - Kerstin Parczany
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
| | - Christoph Röcken
- Department of Pathology, Christian-Albrechts-University, Kiel, Germany.
| | - Markus Steinfath
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
| | - Norbert Weiler
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
| | - Martin Albrecht
- Department of Anesthesiology and Intensive Care Medicine, University Medical Center Schleswig-Holstein, Schwanenweg 21, 24105, Kiel, Germany.
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178
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Sims CR, Nguyen TC, Mayeux PR. Could Biomarkers Direct Therapy for the Septic Patient? J Pharmacol Exp Ther 2016; 357:228-39. [PMID: 26857961 DOI: 10.1124/jpet.115.230797] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 02/05/2016] [Indexed: 01/25/2023] Open
Abstract
Sepsis is a serious medical condition caused by a severe systemic inflammatory response to a bacterial, fungal, or viral infection that most commonly affects neonates and the elderly. Advances in understanding the pathophysiology of sepsis have resulted in guidelines for care that have helped reduce the risk of dying from sepsis for both children and older adults. Still, over the past three decades, a large number of clinical trials have been undertaken to evaluate pharmacological agents for sepsis. Unfortunately, all of these trials have failed, with the use of some agents even shown to be harmful. One key issue in these trials was the heterogeneity of the patient population that participated. What has emerged is the need to target therapeutic interventions to the specific patient's underlying pathophysiological processes, rather than looking for a universal therapy that would be effective in a "typical" septic patient, who does not exist. This review supports the concept that identification of the right biomarkers that can direct therapy and provide timely feedback on its effectiveness will enable critical care physicians to decrease mortality of patients with sepsis and improve the quality of life of survivors.
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Affiliation(s)
- Clark R Sims
- Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, Arkansas (C.R.S., P.R.M.); and Department of Pediatrics, Section of Critical Care Medicine, Baylor College of Medicine/Texas Children's Hospital, Houston, Texas (T.C.N.)
| | - Trung C Nguyen
- Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, Arkansas (C.R.S., P.R.M.); and Department of Pediatrics, Section of Critical Care Medicine, Baylor College of Medicine/Texas Children's Hospital, Houston, Texas (T.C.N.)
| | - Philip R Mayeux
- Department of Pharmacology and Toxicology, University of Arkansas for Medical Sciences, Little Rock, Arkansas (C.R.S., P.R.M.); and Department of Pediatrics, Section of Critical Care Medicine, Baylor College of Medicine/Texas Children's Hospital, Houston, Texas (T.C.N.)
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179
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Yan Z, Liu J, Xie L, Liu X, Zeng Y. Role of heparan sulfate in mediating CXCL8-induced endothelial cell migration. PeerJ 2016; 4:e1669. [PMID: 26870616 PMCID: PMC4748698 DOI: 10.7717/peerj.1669] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 01/18/2016] [Indexed: 02/05/2023] Open
Abstract
CXCL8 (Interleukin-8, IL-8) plays an important role in angiogenesis and wound healing by prompting endothelial cell migration. It has been suggested that heparan sulfate (HS) could provide binding sites on endothelial cells to retain and activate highly diffusible cytokines and inflammatory chemokines. In the present study, we aimed to test the hypothesis that HS is essential for enhancement of endothelial cell migration by CXCL8, and to explore the underlying mechanism by detecting the changes in expression and activity of Rho GTPases and in the organization of actin cytoskeleton after enzymatic removal of HS on human umbilical vein endothelial cells (HUVECs) by using heparinase III. Our results revealed that the wound healing induced by CXCL8 was greatly attenuated by removal of HS. The CXCL8-upregulated Rho GTPases including Cdc42, Rac1, and RhoA, and CXCL8-increased Rac1/Rho activity were suppressed by removal of HS. The polymerization and polarization of actin cytoskeleton, and the increasing of stress fibers induced by CXCL8 were also abolished by heparinase III. Taken together, our results demonstrated an essential role of HS in mediating CXCL8-induced endothelial cell migration, and highlighted the biological importance of the interaction between CXCL8 and heparan sulfate in wound healing.
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Affiliation(s)
- Zhiping Yan
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, China
| | - Jingxia Liu
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, China
| | - Linshen Xie
- West China School of Public Health, No. 4 West China Hospital, Sichuan University, China
| | - Xiaoheng Liu
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, China
| | - Ye Zeng
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, China
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180
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Zafrani L, Ince C. Microcirculation in Acute and Chronic Kidney Diseases. Am J Kidney Dis 2015; 66:1083-94. [DOI: 10.1053/j.ajkd.2015.06.019] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 06/15/2015] [Indexed: 01/20/2023]
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181
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Curry FRE, Clark JF, Adamson RH. Microperfusion Technique to Investigate Regulation of Microvessel Permeability in Rat Mesentery. J Vis Exp 2015. [PMID: 26436435 DOI: 10.3791/53210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
Experiments to measure the permeability properties of individually perfused microvessels provide a bridge between investigation of molecular and cellular mechanisms regulating vascular permeability in cultured endothelial cell monolayers and the functional exchange properties of whole microvascular beds. A method to cannulate and perfuse venular microvessels of rat mesentery and measure the hydraulic conductivity of the microvessel wall is described. The main equipment needed includes an intravital microscope with a large modified stage that supports micromanipulators to position three different microtools: (1) a beveled glass micropipette to cannulate and perfuse the microvessel; (2) a glass micro-occluder to transiently block perfusion and enable measurement of transvascular water flow movement at a measured hydrostatic pressure, and (3) a blunt glass rod to stabilize the mesenteric tissue at the site of cannulation. The modified Landis micro-occlusion technique uses red cells suspended in the artificial perfusate as markers of transvascular fluid movement, and also enables repeated measurements of these flows as experimental conditions are changed and hydrostatic and colloid osmotic pressure difference across the microvessels are carefully controlled. Measurements of hydraulic conductivity first using a control perfusate, then after re-cannulation of the same microvessel with the test perfusates enable paired comparisons of the microvessel response under these well-controlled conditions. Attempts to extend the method to microvessels in the mesentery of mice with genetic modifications expected to modify vascular permeability were severely limited because of the absence of long straight and unbranched microvessels in the mouse mesentery, but the recent availability of the rats with similar genetic modifications using the CRISPR/Cas9 technology is expected to open new areas of investigation where the methods described herein can be applied.
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Affiliation(s)
- Fitz-Roy E Curry
- Department of Physiology & Membrane Biology, University of California Davis
| | - Joyce F Clark
- Department of Physiology & Membrane Biology, University of California Davis
| | - Roger H Adamson
- Department of Physiology & Membrane Biology, University of California Davis;
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182
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Zeng Y, Liu XH, Tarbell J, Fu B. Sphingosine 1-phosphate induced synthesis of glycocalyx on endothelial cells. Exp Cell Res 2015; 339:90-5. [PMID: 26364737 DOI: 10.1016/j.yexcr.2015.08.013] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Revised: 08/15/2015] [Accepted: 08/20/2015] [Indexed: 01/14/2023]
Abstract
Sphingosine 1-phosphate (S1P) protects glycocalyx against shedding, playing important roles in endothelial functions. We previously found that glycocalyx on endothelial cells (ECs) was shed after plasma protein depletion. In the present study, we investigated the role of S1P on the recovery of glycocalyx, and tested whether it is mediated by phosphoinositide 3-kinase (PI3K) pathway. After depletion of plasma protein, ECs were treated with S1P for another 6h. And then, the major components of glycocalyx including syndecan-1 with attached heparan sulfate (HS) and chondroitin sulfate (CS) on endothelial cells were detected using confocal fluorescence microscopy. Role of PI3K in the S1P-induced synthesis of glycocalyx was confirmed by using the PI3K inhibitor (LY294002). Syndecan-1 with attached HS and CS were degraded with duration of plasma protein depletion. S1P induced recovery of syndecan-1 with attached HS and CS. The PI3K inhibitor LY294002 abolished the effect of S1P on recovery of glycocalyx. Thus, S1P induced synthesis of glycocalyx on endothelial cells and it is mediated by PI3K pathway.
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Affiliation(s)
- Ye Zeng
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, China.
| | - Xiao-Heng Liu
- Institute of Biomedical Engineering, School of Preclinical and Forensic Medicine, Sichuan University, China
| | - John Tarbell
- Department of Biomedical Engineering, The City College of New York, United States of America
| | - Bingmei Fu
- Department of Biomedical Engineering, The City College of New York, United States of America
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183
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Binder BYK, Williams PA, Silva EA, Leach JK. Lysophosphatidic Acid and Sphingosine-1-Phosphate: A Concise Review of Biological Function and Applications for Tissue Engineering. TISSUE ENGINEERING PART B-REVIEWS 2015; 21:531-42. [PMID: 26035484 DOI: 10.1089/ten.teb.2015.0107] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The presentation and controlled release of bioactive signals to direct cellular growth and differentiation represents a widely used strategy in tissue engineering. Historically, work in this field has primarily focused on the delivery of large cytokines and growth factors, which can be costly to manufacture and difficult to deliver in a sustained manner. There has been a marked increase over the past decade in the pursuit of lipid mediators due to their wide range of effects over multiple cell types, low cost, and ease of scale-up. Lysophosphatidic acid (LPA) and sphingosine-1-phosphate (S1P) are two bioactive lysophospholipids (LPLs) that have gained attention for use as pharmacological agents in tissue engineering applications. While these lipids can have similar effects on cellular response, they possess distinct chemical backbones, mechanisms of synthesis and degradation, and signaling pathways using a discrete set of G-protein-coupled receptors (GPCRs). LPA and S1P predominantly act extracellularly on their GPCRs and can directly regulate cell survival, differentiation, cytokine secretion, proliferation, and migration--each of the important functions that must be considered in regenerative medicine. In addition to these potent physiological functions, these LPLs play pivotal roles in a number of pathophysiological processes. To capitalize on the promise of these molecules in tissue engineering, these lipids have been incorporated into biomaterials for in vivo delivery. Here, we survey the effects of LPA and S1P on both cellular- and tissue-level phenotypes, with an eye toward regulating stem/progenitor cell growth and differentiation. In particular, we examine work that has translational applications for cell-based tissue engineering strategies in promoting cell survival, bone and cartilage engineering, and therapeutic angiogenesis.
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Affiliation(s)
- Bernard Y K Binder
- 1 Department of Biomedical Engineering, University of California , Davis, Davis, California
| | - Priscilla A Williams
- 1 Department of Biomedical Engineering, University of California , Davis, Davis, California
| | - Eduardo A Silva
- 1 Department of Biomedical Engineering, University of California , Davis, Davis, California
| | - J Kent Leach
- 1 Department of Biomedical Engineering, University of California , Davis, Davis, California.,2 Department of Orthopaedic Surgery, School of Medicine, University of California , Davis, Sacramento, California
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184
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Abstract
Syndecans are multifunctional heparan sulfate proteoglycans (HSPGs) with roles in cell adhesion, migration, receptor trafficking and growth-factor interactions and signalling. Studies using syndecan null animals have revealed limited roles for syndecans during development; however, under conditions of challenge or insult, several phenotypes have emerged. Angiogenesis is an important process both in development and in wound healing, but also in pathologies such as cancer and chronic inflammatory conditions. In the present paper, we summarize the main studies elucidating the role of syndecans in angiogenesis and their potential as novel therapeutic targets.
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185
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Becker BF, Jacob M, Leipert S, Salmon AHJ, Chappell D. Degradation of the endothelial glycocalyx in clinical settings: searching for the sheddases. Br J Clin Pharmacol 2015; 80:389-402. [PMID: 25778676 DOI: 10.1111/bcp.12629] [Citation(s) in RCA: 286] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 02/10/2015] [Accepted: 03/11/2015] [Indexed: 12/11/2022] Open
Abstract
The endothelial glycocalyx has a profound influence at the vascular wall on the transmission of shear stress, on the maintenance of a selective permeability barrier and a low hydraulic conductivity, and on attenuating firm adhesion of blood leukocytes and platelets. Major constituents of the glycocalyx, including syndecans, heparan sulphates and hyaluronan, are shed from the endothelial surface under various acute and chronic clinical conditions, the best characterized being ischaemia and hypoxia, sepsis and inflammation, atherosclerosis, diabetes, renal disease and haemorrhagic viral infections. Damage has also been detected by in vivo microscopic techniques. Matrix metalloproteases may shed syndecans and heparanase, released from activated mast cells, cleaves heparan sulphates from core proteins. According to new data, not only hyaluronidase but also the serine proteases thrombin, elastase, proteinase 3 and plasminogen, as well as cathepsin B lead to loss of hyaluronan from the endothelial surface layer, suggesting a wide array of potentially destructive conditions. Appropriately, pharmacological agents such as inhibitors of inflammation, antithrombin and inhibitors of metalloproteases display potential to attenuate shedding of the glycocalyx in various experimental models. Also, plasma components, especially albumin, stabilize the glycocalyx and contribute to the endothelial surface layer. Though symptoms of the above listed diseases and conditions correlate with sequelae expected from disturbance of the endothelial glycocalyx (oedema, inflammation, leukocyte and platelet adhesion, low reflow), therapeutic studies to prove a causal connection have yet to be designed. With respect to studies on humans, some clinical evidence exists for benefits from application of sulodexide, a preparation delivering precursors of the glycocalyx constituent heparan sulphate. At present, the simplest option for protecting the glycocalyx seems to be to ensure an adequate level of albumin. However, also in this case, definite proof of causality needs to be delivered.
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Affiliation(s)
- Bernhard F Becker
- Walter-Brendel Centre of Experimental Medicine, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Matthias Jacob
- Department of Anaesthesiology, Hospital St Elisabeth, Straubing, Germany
| | - Stephanie Leipert
- Walter-Brendel Centre of Experimental Medicine, Ludwig-Maximilians-University Munich, Munich, Germany
| | - Andrew H J Salmon
- Bristol Renal, School of Physiology and Pharmacology, University of Bristol, Bristol, UK
| | - Daniel Chappell
- Department of Anaesthesiology, University Hospital Munich, Munich, Germany
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186
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Marki A, Esko JD, Pries AR, Ley K. Role of the endothelial surface layer in neutrophil recruitment. J Leukoc Biol 2015; 98:503-15. [PMID: 25979432 DOI: 10.1189/jlb.3mr0115-011r] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2015] [Accepted: 03/25/2015] [Indexed: 12/15/2022] Open
Abstract
Neutrophil recruitment in most tissues is limited to postcapillary venules, where E- and P-selectins are inducibly expressed by venular endothelial cells. These molecules support neutrophil rolling via binding of PSGL-1 and other ligands on neutrophils. Selectins extend ≤ 38 nm above the endothelial plasma membrane, and PSGL-1 extends to 50 nm above the neutrophil plasma membrane. However, endothelial cells are covered with an ESL composed of glycosaminoglycans that is ≥ 500 nm thick and has measurable resistance against compression. The neutrophil surface is also covered with a surface layer. These surface layers would be expected to completely shield adhesion molecules; thus, neutrophils should not be able to roll and adhere. However, in the cremaster muscle and in many other models investigated using intravital microscopy, neutrophils clearly roll, and their rolling is easily and quickly induced. This conundrum was thought to be resolved by the observation that the induction of selectins is accompanied by ESL shedding; however, ESL shedding only partially reduces the ESL thickness (to 200 nm) and thus is insufficient to expose adhesion molecules. In addition to its antiadhesive functions, the ESL also presents neutrophil arrest-inducing chemokines. ESL heparan sulfate can also bind L-selectin expressed by the neutrophils, which contributes to rolling and arrest. We conclude that ESL has both proadhesive and antiadhesive functions. However, most previous studies considered either only the proadhesive or only the antiadhesive effects of the ESL. An integrated model for the role of the ESL in neutrophil rolling, arrest, and transmigration is needed.
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Affiliation(s)
- Alex Marki
- *Division of Inflammation Biology, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California, USA; and Department of Physiology and Center for Cardiovascular Research, Charite, Berlin, Germany
| | - Jeffrey D Esko
- *Division of Inflammation Biology, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California, USA; and Department of Physiology and Center for Cardiovascular Research, Charite, Berlin, Germany
| | - Axel R Pries
- *Division of Inflammation Biology, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California, USA; and Department of Physiology and Center for Cardiovascular Research, Charite, Berlin, Germany
| | - Klaus Ley
- *Division of Inflammation Biology, La Jolla Institute for Allergy and Immunology, La Jolla, California, USA; Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, California, USA; and Department of Physiology and Center for Cardiovascular Research, Charite, Berlin, Germany
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187
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Golden MH. Nutritional and other types of oedema, albumin, complex carbohydrates and the interstitium - a response to Malcolm Coulthard's hypothesis: Oedema in kwashiorkor is caused by hypo-albuminaemia. Paediatr Int Child Health 2015; 35:90-109. [PMID: 25844980 DOI: 10.1179/2046905515y.0000000010] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The various types of oedema in man are considered in relation to Starling's hypothesis of fluid movement from capillaries, with the main emphasis on nutritional oedema and the nephrotic syndrome in children. It is concluded that each condition has sufficient anomalous findings to render Starling's hypothesis untenable. The finding that the endothelial glycocalyx is key to control of fluid movement from and into the capillaries calls for complete revision of our understanding of oedema formation. The factors so far known to affect the function of the glycocalyx are reviewed. As these depend upon sulphated proteoglycans and other glycosaminoglycans, the argument is advanced that the same abnormalities will extend to the interstitial space and that kwashiorkor is fundamentally related to a defect in sulphur metabolism which can explain all the clinical features of the condition, including the formation of oedema.
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Key Words
- Albumin,
- Aldosterone,
- Angiotensin,
- Beriberi,
- Edema,
- Epidemic dropsy,
- Famine oedema,
- Glycocalyx,
- Glycosaminoglycans,
- Heart failure,
- Hunger oedema,
- Kwashiorkor,
- Malnutrition,
- Nephrotic syndrome,
- Oedema,
- Potassium deficiency,
- Pre-eclampsia,
- Protein-energy malnutrition,
- Proteoglycans,
- Renin,
- Salt,
- Severe acute malnutrition
- Vitamin E deficiency,
- War oedema,
- Water,
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188
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189
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Wang Z, Sims CR, Patil NK, Gokden N, Mayeux PR. Pharmacologic targeting of sphingosine-1-phosphate receptor 1 improves the renal microcirculation during sepsis in the mouse. J Pharmacol Exp Ther 2014; 352:61-6. [PMID: 25355645 DOI: 10.1124/jpet.114.219394] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Microvascular failure is hallmark of sepsis in humans and is recognized as a strong predictor of mortality. In the mouse subjected to cecal ligation and puncture (CLP) to induce a clinically relevant sepsis, renal microvascular permeability increases and peritubular capillary perfusion declines rapidly in the kidney leading to acute kidney injury (AKI). Sphingosine-1-phosphate (S1P) is a key regulator of microvascular endothelial function. To investigate the role of S1P in the development of microvascular permeability and peritubular capillary hypoperfusion in the kidney during CLP-induced AKI, we used a pharmacologic approach and a clinically relevant delayed dosing paradigm. Evans blue dye was used to measure renal microvascular permeability and intravital video microscopy was used to quantitate renal cortical capillary perfusion. The S1P receptor 1 (S1P1) agonist SEW2871 [5-[4-phenyl-5-(trifluoromethyl)-2-thienyl]-3-[3-(trifluoromethyl)phenyl]-1,2,4-oxadiazole] and S1P2 antagonist JTE-013 [N-(2,6-dichloro-4-pyridinyl)-2-[1,3-dimethyl-4-(1-methylethyl)-1H-pyrazolo[3,4-b]pyridin-6-yl]-hydrazinecarboxamide] were administered at the time of CLP and produced a dose-dependent but partial reduction in renal microvascular permeability at 6 hours after CLP. However, neither agent improved capillary perfusion at 6 hours. With delayed administration at 6 hours after CLP, only SEW2871 reversed microvascular permeability when measured at 18 hours. Importantly, SEW2871 also restored capillary perfusion and improved renal function. These data suggest that S1P1 and S1P2 do not regulate the early decline in renal capillary perfusion. However, later in the course of sepsis, pharmacologic stimulation of S1P1, even when delaying therapy until after injury has occurred, improves capillary and renal function, suggesting this approach should be evaluated as an adjunct therapy during sepsis.
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Affiliation(s)
- Zhen Wang
- Department of Pharmacology and Toxicology (Z.W., C.R.S., N.K.P., P.R.M.) and Department of Pathology (N.G.), University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Clark R Sims
- Department of Pharmacology and Toxicology (Z.W., C.R.S., N.K.P., P.R.M.) and Department of Pathology (N.G.), University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Naeem K Patil
- Department of Pharmacology and Toxicology (Z.W., C.R.S., N.K.P., P.R.M.) and Department of Pathology (N.G.), University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Neriman Gokden
- Department of Pharmacology and Toxicology (Z.W., C.R.S., N.K.P., P.R.M.) and Department of Pathology (N.G.), University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Philip R Mayeux
- Department of Pharmacology and Toxicology (Z.W., C.R.S., N.K.P., P.R.M.) and Department of Pathology (N.G.), University of Arkansas for Medical Sciences, Little Rock, Arkansas
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190
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Blaho VA, Hla T. An update on the biology of sphingosine 1-phosphate receptors. J Lipid Res 2014; 55:1596-608. [PMID: 24459205 PMCID: PMC4109755 DOI: 10.1194/jlr.r046300] [Citation(s) in RCA: 381] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 01/09/2014] [Indexed: 02/07/2023] Open
Abstract
Sphingosine 1-phosphate (S1P) is a membrane-derived lysophospholipid that acts primarily as an ex-tracellular signaling molecule. Signals initiated by S1P are transduced by five G protein-coupled receptors, named S1P1-5 Cellular and temporal expression of the S1P receptors (S1PRs) determine their specific roles in various organ systems, but they are particularly critical for regulation of the cardiovascular, immune, and nervous systems, with the most well-known contributions of S1PR signaling being modulation of vascular barrier function, vascular tone, and regulation of lymphocyte trafficking. However, our knowledge of S1PR biology is rapidly increasing as they become attractive therapeutic targets in several diseases, such as chronic inflammatory pathologies, autoimmunity, and cancer. Understanding how the S1PRs regulate interactions between biological systems will allow for greater efficacy in this novel therapeutic strategy as well as characterization of complex physiological networks. Because of the rapidly expanding body of research, this review will focus on the most recent advances in S1PRs.
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Affiliation(s)
- Victoria A. Blaho
- Center for Vascular Biology, Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY 10065
| | - Timothy Hla
- Center for Vascular Biology, Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY 10065
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191
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Abstract
Mammals are endowed with a complex set of mechanisms that sense mechanical forces imparted by blood flow to endothelial cells (ECs), smooth muscle cells, and circulating blood cells to elicit biochemical responses through a process referred to as mechanotransduction. These biochemical responses are critical for a host of other responses, including regulation of blood pressure, control of vascular permeability for maintaining adequate perfusion of tissues, and control of leukocyte recruitment during immunosurveillance and inflammation. This review focuses on the role of the endothelial surface proteoglycan/glycoprotein layer-the glycocalyx (GCX)-that lines all blood vessel walls and is an agent in mechanotransduction and the modulation of blood cell interactions with the EC surface. We first discuss the biochemical composition and ultrastructure of the GCX, highlighting recent developments that reveal gaps in our understanding of the relationship between composition and spatial organization. We then consider the roles of the GCX in mechanotransduction and in vascular permeability control and review the prominent interaction of plasma-borne sphingosine-1 phosphate (S1P), which has been shown to regulate both the composition of the GCX and the endothelial junctions. Finally, we consider the association of GCX degradation with inflammation and vascular disease and end with a final section on future research directions.
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Affiliation(s)
- John M Tarbell
- Department of Biomedical Engineering, The City College of the City University of New York, New York, NY 10031
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192
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Adamson RH, Clark JF, Radeva M, Kheirolomoom A, Ferrara KW, Curry FE. Albumin modulates S1P delivery from red blood cells in perfused microvessels: mechanism of the protein effect. Am J Physiol Heart Circ Physiol 2014; 306:H1011-7. [PMID: 24531813 DOI: 10.1152/ajpheart.00829.2013] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Removal of plasma proteins from perfusates increases vascular permeability. The common interpretation of the action of albumin is that it forms part of the permeability barrier by electrostatic binding to the endothelial glycocalyx. We tested the alternate hypothesis that removal of perfusate albumin in rat venular microvessels decreased the availability of sphingosine-1-phosphate (S1P), which is normally carried in plasma bound to albumin and lipoproteins and is required to maintain stable baseline endothelial barriers (Am J Physiol Heart Circ Physiol 303: H825-H834, 2012). Red blood cells (RBCs) are a primary source of S1P in the normal circulation. We compared apparent albumin permeability coefficients [solute permeability (Ps)] measured using perfusates containing albumin (10 mg/ml, control) and conditioned by 20-min exposure to rat RBCs with Ps when test perfusates were in RBC-conditioned protein-free Ringer solution. The control perfusate S1P concentration (439 ± 46 nM) was near the normal plasma value at 37 °C and established a stable baseline Ps (0.9 ± 0.4 × 10(-6) cm/s). Ringer solution perfusate contained 52 ± 8 nM S1P and increased Ps more than 10-fold (16.1 ± 3.9 × 10(-6) cm/s). Consistent with albumin-dependent transport of S1P from RBCs, S1P concentrations in RBC-conditioned solutions decreased as albumin concentration, hematocrit, and temperature decreased. Protein-free Ringer solution perfusates that used liposomes instead of RBCs as flow markers failed to maintain normal permeability, reproducing the "albumin effect" in these mammalian microvessels. We conclude that the albumin effect depends on the action of albumin to facilitate the release and transport of S1P from RBCs that normally provide a significant amount of S1P to the endothelium.
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Affiliation(s)
- R H Adamson
- Department of Physiology and Membrane Biology, University of California, Davis, California; and
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