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Kornemann N, Klimeš F, Kern AL, Behrendt L, Voskrebenzev A, Gutberlet M, Wattjes MP, Wacker F, Vogel-Claussen J, Glandorf J. Cerebral microcirculatory pulse wave propagation and pulse wave amplitude mapping in retrospectively gated MRI. Sci Rep 2023; 13:21374. [PMID: 38049511 PMCID: PMC10696084 DOI: 10.1038/s41598-023-48439-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 11/27/2023] [Indexed: 12/06/2023] Open
Abstract
To analyze cerebral arteriovenous pulse propagation and to generate phase-resolved pulse amplitude maps from a fast gradient-echo sequence offering flow-related enhancement (FREE). Brain MRI was performed using a balanced steady-state free precession sequence at 3T followed by retrospective k-space gating. The time interval of the pulse wave between anterior-, middle- and posterior cerebral artery territories and the superior sagittal sinus were calculated and compared between and older and younger groups within 24 healthy volunteers. Pulse amplitude maps were generated and compared to pseudo-Continuous Arterial Spin Labeling (pCASL) MRI maps by voxel-wise Pearson correlation, Sørensen-Dice maps and in regards to signal contrast. The arteriovenous delays between all vascular territories and the superior sagittal sinus were significantly shorter in the older age group (11 individuals, ≥ 31 years) ranging between 169 ± 112 and 246 ± 299 ms versus 286 ± 244 to 419 ± 299 ms in the younger age group (13 individuals) (P ≤ 0.04). The voxel-wise pulse wave amplitude values and perfusion-weighted pCASL values correlated significantly (Pearson-r = 0.33, P < 0.01). Mean Dice overlaps of high (gray) and low (white matter) regions were 73 ± 3% and 59 ± 5%. No differences in image contrast were seen in the whole brain and the white matter, but significantly higher mean contrast of 0.73 ± 0.23% in cortical gray matter in FREE-MRI compared to 0.52 ± 0.12% in pCASL-MRI (P = 0.01). The dynamic information of flow-related enhancement allows analysis of the cerebral pulse wave propagation potentially providing information about the (micro)circulation on a regional level. However, the pulse wave amplitude reveals weaknesses in comparison to true perfusion-weighting and could rather be used to calculate a pulsatility index.
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Affiliation(s)
- Norman Kornemann
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Filip Klimeš
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Agilo Luitger Kern
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Lea Behrendt
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Andreas Voskrebenzev
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Marcel Gutberlet
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Mike P Wattjes
- Institute for Diagnostic and Interventional Neuroradiology, Hannover Medical School, Hannover, Germany
| | - Frank Wacker
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Jens Vogel-Claussen
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany
| | - Julian Glandorf
- Institute for Diagnostic and Interventional Radiology, Hannover Medical School, Hannover, Germany.
- Biomedical Research in End-Stage and Obstructive Lung Disease Hannover (BREATH), Member of the German Centre for Lung Research (DZL), Hannover, Germany.
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2
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Meli VS, Veerasubramanian PK, Downing TL, Wang W, Liu WF. Mechanosensation to inflammation: Roles for YAP/TAZ in innate immune cells. Sci Signal 2023; 16:eadc9656. [PMID: 37130167 PMCID: PMC10625748 DOI: 10.1126/scisignal.adc9656] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 04/14/2023] [Indexed: 05/04/2023]
Abstract
Innate immune cells are responsible for eliminating foreign infectious agents and cellular debris, and their ability to perceive, respond to, and integrate biochemical and mechanical cues from their microenvironment eventually determines their behavior. In response to tissue injury, pathogen invasion, or a biomaterial implant, immune cells activate many pathways to initiate inflammation in the tissue. In addition to common inflammatory pathways, studies have demonstrated the role of the mechanosensitive proteins and transcriptional coactivators YAP and TAZ (YAP/TAZ) in inflammation and immunity. We review our knowledge of YAP/TAZ in controlling inflammation and immunity in innate immune cells. Furthermore, we discuss the roles of YAP/TAZ in inflammatory diseases, wound healing, and tissue regeneration and how they integrate mechanical cues with biochemical signaling during disease progression. Last, we comment on possible approaches that can be exploited to harness the therapeutic potential of YAP/TAZ in inflammatory diseases.
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Affiliation(s)
- Vijaykumar S. Meli
- Department of Biomedical Engineering, University of California Irvine, CA 92697
- UCI Edwards Lifesciences Foundation Cardiovascular Innovation and Research Center, (CIRC), University of California Irvine, CA 92697
| | - Praveen Krishna Veerasubramanian
- Department of Biomedical Engineering, University of California Irvine, CA 92697
- UCI Edwards Lifesciences Foundation Cardiovascular Innovation and Research Center, (CIRC), University of California Irvine, CA 92697
| | - Timothy L. Downing
- Department of Biomedical Engineering, University of California Irvine, CA 92697
- UCI Edwards Lifesciences Foundation Cardiovascular Innovation and Research Center, (CIRC), University of California Irvine, CA 92697
- NSF-Simons Center for Multiscale Cell Fate Research, University of California Irvine, CA 92697
- Department of Microbiology and Molecular Genetics, University of California Irvine, CA 92697
| | - Wenqi Wang
- Department of Developmental and Cell Biology, University of California Irvine, CA 92697
| | - Wendy F. Liu
- Department of Biomedical Engineering, University of California Irvine, CA 92697
- UCI Edwards Lifesciences Foundation Cardiovascular Innovation and Research Center, (CIRC), University of California Irvine, CA 92697
- Department of Chemical and Biomolecular Engineering, University of California Irvine, CA 92697
- Department of Molecular Biology and Biochemistry, University of California Irvine, CA 92697
- Institute for Immunology, University of California Irvine, CA 92697
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3
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Lee M, Du H, Winer DA, Clemente-Casares X, Tsai S. Mechanosensing in macrophages and dendritic cells in steady-state and disease. Front Cell Dev Biol 2022; 10:1044729. [PMID: 36467420 PMCID: PMC9712790 DOI: 10.3389/fcell.2022.1044729] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Accepted: 11/01/2022] [Indexed: 11/18/2022] Open
Abstract
Macrophages and dendritic cells are myeloid cells that play critical roles in immune responses. Macrophages help to maintain homeostasis through tissue regeneration and the clearance of dead cells, but also mediate inflammatory processes against invading pathogens. As the most potent antigen-presenting cells, dendritic cells are important in connecting innate to adaptive immune responses via activation of T cells, and inducing tolerance under physiological conditions. While it is known that macrophages and dendritic cells respond to biochemical cues in the microenvironment, the role of extracellular mechanical stimuli is becoming increasingly apparent. Immune cell mechanotransduction is an emerging field, where accumulating evidence suggests a role for extracellular physical cues coming from tissue stiffness in promoting immune cell recruitment, activation, metabolism and inflammatory function. Additionally, many diseases such as pulmonary fibrosis, cardiovascular disease, cancer, and cirrhosis are associated with changes to the tissue biophysical environment. This review will discuss current knowledge about the effects of biophysical cues including matrix stiffness, topography, and mechanical forces on macrophage and dendritic cell behavior under steady-state and pathophysiological conditions. In addition, we will also provide insight on molecular mediators and signaling pathways important in macrophage and dendritic cell mechanotransduction.
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Affiliation(s)
- Megan Lee
- Department of Medical Microbiology and Immunology, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada
| | - Huixun Du
- Buck Institute for Research on Aging, Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, United States
| | - Daniel A. Winer
- Division of Cellular and Molecular Biology, Diabetes Research Group, Toronto General Hospital Research Institute (TGHRI), University Health Network, Toronto, ON, Canada
- Department of Immunology, University of Toronto, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Department of Pathology, University Health Network, Toronto, ON, Canada
- Buck Institute for Research on Aging, Novato, CA, United States
| | - Xavier Clemente-Casares
- Cancer Research Institute of Northern Alberta, University of Alberta, Edmonton, AB, Canada
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada
| | - Sue Tsai
- Cancer Research Institute of Northern Alberta, University of Alberta, Edmonton, AB, Canada
- Li Ka Shing Institute of Virology, University of Alberta, Edmonton, AB, Canada
- *Correspondence: Sue Tsai,
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4
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Genetic Factors for Coronary Heart Disease and Their Mechanisms: A Meta-Analysis and Comprehensive Review of Common Variants from Genome-Wide Association Studies. Diagnostics (Basel) 2022; 12:diagnostics12102561. [PMID: 36292250 PMCID: PMC9601486 DOI: 10.3390/diagnostics12102561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/18/2022] [Accepted: 10/20/2022] [Indexed: 11/17/2022] Open
Abstract
Genome-wide association studies (GWAS) have discovered 163 loci related to coronary heart disease (CHD). Most GWAS have emphasized pathways related to single-nucleotide polymorphisms (SNPs) that reached genome-wide significance in their reports, while identification of CHD pathways based on the combination of all published GWAS involving various ethnicities has yet to be performed. We conducted a systematic search for articles with comprehensive GWAS data in the GWAS Catalog and PubMed, followed by a meta-analysis of the top recurring SNPs from ≥2 different articles using random or fixed-effect models according to Cochran Q and I2 statistics, and pathway enrichment analysis. Meta-analyses showed significance for 265 of 309 recurring SNPs. Enrichment analysis returned 107 significant pathways, including lipoprotein and lipid metabolisms (rs7412, rs6511720, rs11591147, rs1412444, rs11172113, rs11057830, rs4299376), atherogenesis (rs7500448, rs6504218, rs3918226, rs7623687), shared cardiovascular pathways (rs72689147, rs1800449, rs7568458), diabetes-related pathways (rs200787930, rs12146487, rs6129767), hepatitis C virus infection/hepatocellular carcinoma (rs73045269/rs8108632, rs56062135, rs188378669, rs4845625, rs11838776), and miR-29b-3p pathways (rs116843064, rs11617955, rs146092501, rs11838776, rs73045269/rs8108632). In this meta-analysis, the identification of various genetic factors and their associated pathways associated with CHD denotes the complexity of the disease. This provides an opportunity for the future development of novel CHD genetic risk scores relevant to personalized and precision medicine.
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5
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Zarkasi KA, Abdul Murad NA, Ahmad N, Jamal R, Abdullah N. Coronary Heart Disease in Type 2 Diabetes Mellitus: Genetic Factors and Their Mechanisms, Gene-Gene, and Gene-Environment Interactions in the Asian Populations. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:647. [PMID: 35055468 PMCID: PMC8775550 DOI: 10.3390/ijerph19020647] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 02/04/2023]
Abstract
Asians are more susceptible to type 2 diabetes mellitus (T2D) and its coronary heart disease (CHD) complications than the Western populations, possibly due to genetic factors, higher degrees of obesity, insulin resistance, and endothelial dysfunction that could occur even in healthy individuals. The genetic factors and their mechanisms, along with gene-gene and gene-environment interactions associated with CHD in T2D Asians, are yet to be explored. Therefore, the objectives of this paper were to review the current evidence of genetic factors for CHD, summarize the proposed mechanisms of these genes and how they may associate with CHD risk, and review the gene-gene and gene-environment interactions in T2D Asians with CHD. The genetic factors can be grouped according to their involvement in the energy and lipoprotein metabolism, vascular and endothelial pathology, antioxidation, cell cycle regulation, DNA damage repair, hormonal regulation of glucose metabolism, as well as cytoskeletal function and intracellular transport. Meanwhile, interactions between single nucleotide polymorphisms (SNPs) from different genes, SNPs within a single gene, and genetic interaction with environmental factors including obesity, smoking habit, and hyperlipidemia could modify the gene's effect on the disease risk. Collectively, these factors illustrate the complexities of CHD in T2D, specifically among Asians.
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Affiliation(s)
- Khairul Anwar Zarkasi
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 56000, Malaysia; (K.A.Z.); (N.A.A.M.); (R.J.)
- Biochemistry Unit, Preclinical Department, Faculty of Medicine and Defence Health, Universiti Pertahanan Nasional Malaysia, Kuala Lumpur 57000, Malaysia
| | - Nor Azian Abdul Murad
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 56000, Malaysia; (K.A.Z.); (N.A.A.M.); (R.J.)
| | - Norfazilah Ahmad
- Epidemiology and Statistics Unit, Department of Community Health, Faculty of Medicine, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 56000, Malaysia;
| | - Rahman Jamal
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 56000, Malaysia; (K.A.Z.); (N.A.A.M.); (R.J.)
| | - Noraidatulakma Abdullah
- UKM Medical Molecular Biology Institute (UMBI), Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 56000, Malaysia; (K.A.Z.); (N.A.A.M.); (R.J.)
- Faculty of Health Sciences, Universiti Kebangsaan Malaysia (UKM), Kuala Lumpur 50300, Malaysia
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6
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Gruber EJ, Aygun AY, Leifer CA. Macrophage uptake of oxidized and acetylated low-density lipoproteins and generation of reactive oxygen species are regulated by linear stiffness of the growth surface. PLoS One 2021; 16:e0260756. [PMID: 34914760 PMCID: PMC8675690 DOI: 10.1371/journal.pone.0260756] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 11/16/2021] [Indexed: 01/18/2023] Open
Abstract
Macrophages are key players in the development of atherosclerosis: they scavenge lipid, transform into foam cells, and produce proinflammatory mediators. At the same time, the arterial wall undergoes profound changes in its mechanical properties. We recently showed that macrophage morphology and proinflammatory potential are regulated by the linear stiffness of the growth surface. Here we asked whether linear stiffness also regulates lipid uptake by macrophages. We cultured murine bone marrow-derived macrophages (BMMs) on polyacrylamide gels modeling stiffness of healthy (1kPa) and diseased (10-150kPa) blood vessels. In unprimed BMMs, increased linear stiffness increased uptake of oxidized (oxLDL) and acetylated (acLDL) low density lipoproteins and generation of reactive oxygen species, but did not alter phagocytosis of bacteria or silica particles. Macrophages adapted to stiff growth surfaces had increased mRNA and protein expression of two key lipoprotein receptors: CD36 and scavenger receptor b1. Regulation of the lipoprotein receptor, lectin-like receptor for ox-LDL, was more complex: mRNA expression decreased but surface protein expression increased with increased stiffness. Focal adhesion kinase was required for maximal uptake of oxLDL, but not of acLDL. Uptake of oxLDL and acLDL was independent of rho-associated coiled coil kinase. Through pharmacologic inhibition and genetic deletion, we found that transient receptor potential vanilloid 4 (TRPV4), a mechanosensitive ion channel, plays an inhibitory role in the uptake of acLDL, but not oxLDL. Together, these results implicate mechanical signaling in the uptake of acLDL and oxLDL, opening up the possibility of new pharmacologic targets to modulate lipid uptake by macrophages in vivo.
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Affiliation(s)
- Erika J. Gruber
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Ali Y. Aygun
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Cynthia A. Leifer
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- * E-mail:
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7
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2D Projection Maps of WSS and OSI Reveal Distinct Spatiotemporal Changes in Hemodynamics in the Murine Aorta during Ageing and Atherosclerosis. Biomedicines 2021; 9:biomedicines9121856. [PMID: 34944672 PMCID: PMC8698968 DOI: 10.3390/biomedicines9121856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/24/2021] [Accepted: 12/02/2021] [Indexed: 11/17/2022] Open
Abstract
Growth, ageing and atherosclerotic plaque development alter the biomechanical forces acting on the vessel wall. However, monitoring the detailed local changes in wall shear stress (WSS) at distinct sites of the murine aortic arch over time has been challenging. Here, we studied the temporal and spatial changes in flow, WSS, oscillatory shear index (OSI) and elastic properties of healthy wildtype (WT, n = 5) and atherosclerotic apolipoprotein E-deficient (Apoe-/-, n = 6) mice during ageing and atherosclerosis using high-resolution 4D flow magnetic resonance imaging (MRI). Spatially resolved 2D projection maps of WSS and OSI of the complete aortic arch were generated, allowing the pixel-wise statistical analysis of inter- and intragroup hemodynamic changes over time and local correlations between WSS, pulse wave velocity (PWV), plaque and vessel wall characteristics. The study revealed converse differences of local hemodynamic profiles in healthy WT and atherosclerotic Apoe-/- mice, and we identified the circumferential WSS as potential marker of plaque size and composition in advanced atherosclerosis and the radial strain as a potential marker for vascular elasticity. Two-dimensional (2D) projection maps of WSS and OSI, including statistical analysis provide a powerful tool to monitor local aortic hemodynamics during ageing and atherosclerosis. The correlation of spatially resolved hemodynamics and plaque characteristics could significantly improve our understanding of the impact of hemodynamics on atherosclerosis, which may be key to understand plaque progression towards vulnerability.
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8
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Ammanamanchi M, Maurer M, Hayenga HN. Inflammation Drives Stiffness Mediated Uptake of Lipoproteins in Primary Human Macrophages and Foam Cell Proliferation. Ann Biomed Eng 2021; 49:3425-3437. [PMID: 34734362 PMCID: PMC8678330 DOI: 10.1007/s10439-021-02881-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Accepted: 10/21/2021] [Indexed: 10/19/2022]
Abstract
Macrophage to foam cell transition and their accumulation in the arterial intima are the key events that trigger atherosclerosis, a multifactorial inflammatory disease. Previous studies have linked arterial stiffness and cardiovascular disease and have highlighted the use of arterial stiffness as a potential early-stage marker. Yet the relationship between arterial stiffness and atherosclerosis in terms of macrophage function is poorly understood. Thus, it is pertinent to understand the mechanobiology of macrophages to clarify their role in plaque advancement. We explore how substrate stiffness affects proliferation of macrophages and foam cells, traction forces exerted by macrophages and uptake of native and oxidized low-density lipoproteins. We demonstrate that stiffness influences foam cell proliferation under both naïve and inflammatory conditions. Naïve foam cells proliferated faster on the 4 kPa polyacrylamide gel and glass whereas under inflammatory conditions, maximum proliferation was recorded on glass. Macrophage and foam cell traction forces were positively correlated to the substrate stiffness. Furthermore, the influence of stiffness was demonstrated on the uptake of lipoproteins on macrophages treated with lipopolysaccharide + interferon gamma. Cells on softer 1 kPa substrates had a significantly higher uptake of low-density lipoproteins and oxidized low-density lipoproteins compared to stiffer substrates. The results herein indicate that macrophage function is modulated by stiffness and help better understand ways in which macrophages and foam cells could contribute to the development and progression of atherosclerotic plaque.
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Affiliation(s)
- Manasvini Ammanamanchi
- Department of Biomedical Engineering, University of Texas at Dallas, BSB 12.826, 800 W Campbell Road, Richardson, TX, 75080, USA
| | - Melanie Maurer
- Meinig School of Biomedical Engineering, Cornell University, Ithaca, NY, 14850, USA
| | - Heather N Hayenga
- Department of Biomedical Engineering, University of Texas at Dallas, BSB 12.826, 800 W Campbell Road, Richardson, TX, 75080, USA.
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9
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Yu H, Kang D, Whang M, Kim T, Kim J. A Microfluidic Model Artery for Studying the Mechanobiology of Endothelial Cells. Adv Healthc Mater 2021; 10:e2100508. [PMID: 34297476 DOI: 10.1002/adhm.202100508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 06/25/2021] [Indexed: 11/07/2022]
Abstract
Recent vascular mechanobiology studies find that endothelial cells (ECs) convert multiple mechanical forces into functional responses in a nonadditive way, suggesting that signaling pathways such as those regulating cytoskeleton may be shared among the processes of converting individual forces. However, previous in vitro EC-culture platforms are inherent with extraneous mechanical components, which may saturate or insufficiently activate the shared signaling pathways and accordingly, may misguide EC mechanobiological responses being investigated. Here, a more physiologically relevant model artery is reported that accurately reproduces most of the mechanical forces found in vivo, which can be individually varied in any combination to pathological levels to achieve diseased states. Arterial geometries of normal and diseased states are also realized. By mimicking mechanical microenvironments of early-stage atherosclerosis, it is demonstrated that the elevated levels of the different types of stress experienced by ECs strongly correlate with the disruption of barrier integrity, suggesting that boundaries of an initial lesion could be sites for efficient disease progression.
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Affiliation(s)
- Hyeonji Yu
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Dongwon Kang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Minji Whang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Taeyoung Kim
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 04107, Republic of Korea
| | - Jungwook Kim
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 04107, Republic of Korea
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10
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Zheng Y, Thelen BJ, Rajaram N, Krishnamurthy VN, Hamilton J, Funes-Lora MA, Morgan T, Yessayan L, Bishop B, Osborne N, Henke P, Shih AJ, Weitzel WF. Angioplasty Induced Changes in Dialysis Vascular Access Compliance. Ann Biomed Eng 2021; 49:2635-2645. [PMID: 34382112 DOI: 10.1007/s10439-021-02844-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/29/2021] [Indexed: 11/24/2022]
Abstract
Dialysis vascular access remains vitally important to maintain life and functional capacity with end stage renal disease. Angioplasty is an integral part of maintaining dialysis access function and patency. To understand the effect of angioplasty balloon dilation on vascular wall mechanics, we conducted a clinical study to evaluate the elastic modulus of the anastomosis in five subjects with anastomosis stenoses, before and after six angioplasty procedures, using B-mode ultrasound DICOM data. A novel and open source vascular ultrasound high-resolution speckle tracking software tool was used. The median lumen diameter increased from 3.4 to 5.5 mm after angioplasty. Meanwhile, the median elastic modulus of the 18 measurements at the anastomosis increased by 52.2%, from 2.24 × 103 to 3.41 × 103 mmHg. The results support our hypothesis that the structural changes induced in the vessel wall by balloon dilation lead to reduced vascular compliance and a higher elastic modulus of the vessel wall.
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Affiliation(s)
- Yihao Zheng
- Department of Mechanical Engineering, Worcester Polytechnic Institute, 100 Institute Rd, Worcester, MA, 01609, USA. .,VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.
| | - Brian J Thelen
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Department of Statistics, University of Michigan, Ann Arbor, MI, USA.,Michigan Tech Research Institute, Michigan Technological University, Ann Arbor, MI, USA
| | - Nirmala Rajaram
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Department of Psychiatry, University of Michigan, Ann Arbor, MI, USA
| | - Venkataramu N Krishnamurthy
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Departments of Radiology and Surgery, University of Michigan, Ann Arbor, MI, USA
| | - James Hamilton
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Emerge Now Inc., Los Angeles, CA, USA
| | | | | | - Lenar Yessayan
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | | | - Nickolas Osborne
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Peter Henke
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Albert J Shih
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, USA
| | - William F Weitzel
- VA Ann Arbor Healthcare System, Ann Arbor, MI, USA.,Department of Internal Medicine, University of Michigan, Ann Arbor, MI, USA
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11
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Winter P, Andelovic K, Kampf T, Hansmann J, Jakob PM, Bauer WR, Zernecke A, Herold V. Simultaneous measurements of 3D wall shear stress and pulse wave velocity in the murine aortic arch. J Cardiovasc Magn Reson 2021; 23:34. [PMID: 33731147 PMCID: PMC7972216 DOI: 10.1186/s12968-021-00725-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 02/03/2021] [Indexed: 11/16/2022] Open
Abstract
PURPOSE Wall shear stress (WSS) and pulse wave velocity (PWV) are important parameters to characterize blood flow in the vessel wall. Their quantification with flow-sensitive phase-contrast (PC) cardiovascular magnetic resonance (CMR), however, is time-consuming. Furthermore, the measurement of WSS requires high spatial resolution, whereas high temporal resolution is necessary for PWV measurements. For these reasons, PWV and WSS are challenging to measure in one CMR session, making it difficult to directly compare these parameters. By using a retrospective approach with a flexible reconstruction framework, we here aimed to simultaneously assess both PWV and WSS in the murine aortic arch from the same 4D flow measurement. METHODS Flow was measured in the aortic arch of 18-week-old wildtype (n = 5) and ApoE-/- mice (n = 5) with a self-navigated radial 4D-PC-CMR sequence. Retrospective data analysis was used to reconstruct the same dataset either at low spatial and high temporal resolution (PWV analysis) or high spatial and low temporal resolution (WSS analysis). To assess WSS, the aortic lumen was labeled by semi-automatically segmenting the reconstruction with high spatial resolution. WSS was determined from the spatial velocity gradients at the lumen surface. For calculation of the PWV, segmentation data was interpolated along the temporal dimension. Subsequently, PWV was quantified from the through-plane flow data using the multiple-points transit-time method. Reconstructions with varying frame rates and spatial resolutions were performed to investigate the influence of spatiotemporal resolution on the PWV and WSS quantification. RESULTS 4D flow measurements were conducted in an acquisition time of only 35 min. Increased peak flow and peak WSS values and lower errors in PWV estimation were observed in the reconstructions with high temporal resolution. Aortic PWV was significantly increased in ApoE-/- mice compared to the control group (1.7 ± 0.2 versus 2.6 ± 0.2 m/s, p < 0.001). Mean WSS magnitude values averaged over the aortic arch were (1.17 ± 0.07) N/m2 in wildtype mice and (1.27 ± 0.10) N/m2 in ApoE-/- mice. CONCLUSION The post processing algorithm using the flexible reconstruction framework developed in this study permitted quantification of global PWV and 3D-WSS in a single acquisition. The possibility to assess both parameters in only 35 min will markedly improve the analyses and information content of in vivo measurements.
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Affiliation(s)
- Patrick Winter
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074, Würzburg, Germany.
- Medical Clinic and Policlinic I, University Hospital Wuerzburg, Oberdürrbacher Straße 6, 97080, Würzburg, Germany.
| | - Kristina Andelovic
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute of Experimental Biomedicine, University Hospital Würzburg, Josef-Schneider-Straße 2, 97080, Würzburg, Germany
| | - Thomas Kampf
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
- Department of Diagnostic and Interventional Neuroradiology, University Hospital Würzburg, Josef-Schneider-Straße 11, 97080, Würzburg, Germany
| | - Jan Hansmann
- Institute of Electrical Engineering, University of Applied Sciences Würzburg-Schweinfurt (FHWS), Ignaz-Schön-Straße 11, 97421, Schweinfurt, Germany
| | - Peter Michael Jakob
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Wolfgang Rudolf Bauer
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
- Institute of Experimental Biomedicine, University Hospital Würzburg, Josef-Schneider-Straße 2, 97080, Würzburg, Germany
| | - Alma Zernecke
- Institute of Experimental Biomedicine, University Hospital Würzburg, Josef-Schneider-Straße 2, 97080, Würzburg, Germany
| | - Volker Herold
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074, Würzburg, Germany
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Andelovic K, Winter P, Jakob PM, Bauer WR, Herold V, Zernecke A. Evaluation of Plaque Characteristics and Inflammation Using Magnetic Resonance Imaging. Biomedicines 2021; 9:185. [PMID: 33673124 PMCID: PMC7917750 DOI: 10.3390/biomedicines9020185] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 02/08/2021] [Accepted: 02/09/2021] [Indexed: 12/19/2022] Open
Abstract
Atherosclerosis is an inflammatory disease of large and medium-sized arteries, characterized by the growth of atherosclerotic lesions (plaques). These plaques often develop at inner curvatures of arteries, branchpoints, and bifurcations, where the endothelial wall shear stress is low and oscillatory. In conjunction with other processes such as lipid deposition, biomechanical factors lead to local vascular inflammation and plaque growth. There is also evidence that low and oscillatory shear stress contribute to arterial remodeling, entailing a loss in arterial elasticity and, therefore, an increased pulse-wave velocity. Although altered shear stress profiles, elasticity and inflammation are closely intertwined and critical for plaque growth, preclinical and clinical investigations for atherosclerosis mostly focus on the investigation of one of these parameters only due to the experimental limitations. However, cardiovascular magnetic resonance imaging (MRI) has been demonstrated to be a potent tool which can be used to provide insights into a large range of biological parameters in one experimental session. It enables the evaluation of the dynamic process of atherosclerotic lesion formation without the need for harmful radiation. Flow-sensitive MRI provides the assessment of hemodynamic parameters such as wall shear stress and pulse wave velocity which may replace invasive and radiation-based techniques for imaging of the vascular function and the characterization of early plaque development. In combination with inflammation imaging, the analyses and correlations of these parameters could not only significantly advance basic preclinical investigations of atherosclerotic lesion formation and progression, but also the diagnostic clinical evaluation for early identification of high-risk plaques, which are prone to rupture. In this review, we summarize the key applications of magnetic resonance imaging for the evaluation of plaque characteristics through flow sensitive and morphological measurements. The simultaneous measurements of functional and structural parameters will further preclinical research on atherosclerosis and has the potential to fundamentally improve the detection of inflammation and vulnerable plaques in patients.
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Affiliation(s)
- Kristina Andelovic
- Institute of Experimental Biomedicine, University Hospital Würzburg, 97080 Würzburg, Germany
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
| | - Patrick Winter
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
- Internal Medicine I, Cardiology, University Hospital Würzburg, 97080 Würzburg, Germany;
| | - Peter Michael Jakob
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
| | - Wolfgang Rudolf Bauer
- Internal Medicine I, Cardiology, University Hospital Würzburg, 97080 Würzburg, Germany;
| | - Volker Herold
- Experimental Physics V, University of Würzburg, 97074 Würzburg, Germany; (P.W.); (P.M.J.); (V.H.)
| | - Alma Zernecke
- Institute of Experimental Biomedicine, University Hospital Würzburg, 97080 Würzburg, Germany
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Chuang YC, Chang HM, Li CY, Cui Y, Lee CL, Chen CS. Reactive Oxygen Species and Inflammatory Responses of Macrophages to Substrates with Physiological Stiffness. ACS APPLIED MATERIALS & INTERFACES 2020; 12:48432-48441. [PMID: 33064443 DOI: 10.1021/acsami.0c16638] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Macrophages play essential roles in innate immunity and their functions can be activated by different signals at pathological sites. Concerning changes in the rigidity of the microenvironment as a disease progresses, the influence of stiffened substrates on macrophage physiology remains elusive. In this study, to evaluate the effect of stiffened substrates on macrophages, we used J774A.1 cells as the macrophage model to investigate its mechanoinflammation responses using engineered polymeric substrates with various physiological rigidities (approximately 0.6 to 100 kPa). Under lipopolysaccharide (LPS) and adenosine triphosphate (ATP) stress, approximately 4-fold higher cytoplasmic reactive oxygen species (ROS) were triggered in cells on the softer substrate, compared with cells on the stiff substrates. The enhanced ROS response was found to be regulated mainly by NADPH oxidase. Moreover, mitochondrial ROS (mtROS), a crucial intracellular ROS source, are produced in response to substrate rigidity. The results showed higher mtROS production when cells were grown on a soft substrate with LPS/ATP stimuli, and the mechano-mtROS alteration was eliminated by Rho kinase inhibitor Y-27632. We suggest that substrate rigidity can coincide with LPS/ATP in regulating the ROS generation of macrophages. As a result of the pivotal role of ROS in regulating inflammation, increased NLRP-3 inflammasome formation and higher NO secretion (an approximately 300% increase) were observed with macrophages grown on soft substrates. Although no substantial genomic distinction was identified in our experiments, based on the phenotypic and functional results, softer substrates prime macrophages toward the proinflammatory (M1)-like phenotype. In summary, this study demonstrated the mechanosensitive inflammatory response of macrophages and the alteration of ROS, as secondary inflammation signals, may contribute to the functional status of macrophages. These findings not only provide an alternative interpretation of the functional transitions of macrophages influenced by substrate rigidity but may also support the manipulation of the inflammatory responses of macrophages via physical microenvironment modifications.
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Affiliation(s)
- Yung-Chu Chuang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Hsaio-Ming Chang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 300044, Taiwan
- School of Engineering, University of California Merced, Merced, California 95343, United States
| | - Chia-Yang Li
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
- Department of Medical Research, Kaohsiung Medical University Hospital, Kaohsiung 80708, Taiwan
- Center for Infectious Disease and Cancer Research, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Yujia Cui
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 300044, Taiwan
| | | | - Chi-Shuo Chen
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 300044, Taiwan
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Riedl KA, Kampf T, Herold V, Behr VC, Bauer WR. Wall shear stress analysis using 17.6 Tesla MRI: A longitudinal study in ApoE-/- mice with histological analysis. PLoS One 2020; 15:e0238112. [PMID: 32857805 PMCID: PMC7454980 DOI: 10.1371/journal.pone.0238112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Accepted: 08/10/2020] [Indexed: 12/31/2022] Open
Abstract
This longitudinal study was performed to evaluate the feasibility of detecting the interaction between wall shear stress (WSS) and plaque development. 20 ApoE-/- mice were separated in 12 mice with Western Diet and 8 mice with Chow Diet. Magnetic resonance (MR) scans at 17.6 Tesla and histological analysis were performed after one week, eight and twelve weeks. All in vivo MR measurements were acquired using a flow sensitive phase contrast method for determining vectorial flow. Histological sections were stained with Hematoxylin and Eosin, Elastica van Gieson and CD68 staining. Data analysis was performed using Ensight and a Matlab-based “Flow Tool”. The body weight of ApoE-/- mice increased significantly over 12 weeks. WSS values increased in the Western Diet group over the time period; in contrast, in the Chow Diet group the values decreased from the first to the second measurement point. Western Diet mice showed small plaque formations with elastin fragmentations after 8 weeks and big plaque formations after 12 weeks; Chow Diet mice showed a few elastin fragmentations after 8 weeks and small plaque formations after 12 weeks. Favored by high-fat diet, plaque formation results in higher values of WSS. With wall shear stress being a known predictor for atherosclerotic plaque development, ultra highfield MRI can serve as a tool for studying the causes and beginnings of atherosclerosis.
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Affiliation(s)
- Katharina A. Riedl
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
- Department of Cardiology, University Heart & Vascular Center Hamburg, Hamburg, Germany
- * E-mail:
| | - Thomas Kampf
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
- Department of Diagnostic and Interventional Neuroradiology, University Hospital Würzburg, Würzburg, Germany
| | - Volker Herold
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
| | - Volker C. Behr
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
| | - Wolfgang R. Bauer
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
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Gruber EJ, Leifer CA. Molecular regulation of TLR signaling in health and disease: mechano-regulation of macrophages and TLR signaling. Innate Immun 2020; 26:15-25. [PMID: 31955624 PMCID: PMC6974875 DOI: 10.1177/1753425919838322] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Immune cells encounter tissues with vastly different biochemical and physical
characteristics. Much of the research emphasis has focused on the role of
cytokines and chemokines in regulating immune cell function, but the role of the
physical microenvironment has received considerably less attention. The tissue
mechanics, or stiffness, of healthy tissues varies dramatically from soft
adipose tissue and brain to stiff cartilage and bone. Tissue mechanics also
change due to fibrosis and with diseases such as atherosclerosis or cancer. The
process by which cells sense and respond to their physical microenvironment is
called mechanotransduction. Here we review mechanotransduction in
immunologically important diseases and how physical characteristics of tissues
regulate immune cell function, with a specific emphasis on mechanoregulation of
macrophages and TLR signaling.
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Affiliation(s)
- Erika J Gruber
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY, USA
| | - Cynthia A Leifer
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY, USA
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Winter P, Andelovic K, Kampf T, Gutjahr FT, Heidenreich J, Zernecke A, Bauer WR, Jakob PM, Herold V. Fast self-navigated wall shear stress measurements in the murine aortic arch using radial 4D-phase contrast cardiovascular magnetic resonance at 17.6 T. J Cardiovasc Magn Reson 2019; 21:64. [PMID: 31610777 PMCID: PMC6792269 DOI: 10.1186/s12968-019-0566-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Accepted: 07/23/2019] [Indexed: 11/10/2022] Open
Abstract
PURPOSE 4D flow cardiovascular magnetic resonance (CMR) and the assessment of wall shear stress (WSS) are non-invasive tools to study cardiovascular risks in vivo. Major limitations of conventional triggered methods are the long measurement times needed for high-resolution data sets and the necessity of stable electrocardiographic (ECG) triggering. In this work an ECG-free retrospectively synchronized method is presented that enables accelerated high-resolution measurements of 4D flow and WSS in the aortic arch of mice. METHODS 4D flow and WSS were measured in the aortic arch of 12-week-old wildtype C57BL/6 J mice (n = 7) with a radial 4D-phase-contrast (PC)-CMR sequence, which was validated in a flow phantom. Cardiac and respiratory motion signals were extracted from the radial CMR signal and were used for the reconstruction of 4D-flow data. Rigid motion correction and a first order B0 correction was used to improve the robustness of magnitude and velocity data. The aortic lumen was segmented semi-automatically. Temporally averaged and time-resolved WSS and oscillatory shear index (OSI) were calculated from the spatial velocity gradients at the lumen surface at 14 locations along the aortic arch. Reproducibility was tested in 3 animals and the influence of subsampling was investigated. RESULTS Volume flow, cross-sectional areas, WSS and the OSI were determined in a measurement time of only 32 min. Longitudinal and circumferential WSS and radial stress were assessed at 14 analysis planes along the aortic arch. The average longitudinal, circumferential and radial stress values were 1.52 ± 0.29 N/m2, 0.28 ± 0.24 N/m2 and - 0.21 ± 0.19 N/m2, respectively. Good reproducibility of WSS values was observed. CONCLUSION This work presents a robust measurement of 4D flow and WSS in mice without the need of ECG trigger signals. The retrospective approach provides fast flow quantification within 35 min and a flexible reconstruction framework.
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Affiliation(s)
- Patrick Winter
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
- Medical Clinic and Policlinic I, University Wuerzburg, Oberdürrbacher Straße 6, 97080 Würzburg, Germany
| | - Kristina Andelovic
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
- Medical Clinic and Policlinic I, University Wuerzburg, Oberdürrbacher Straße 6, 97080 Würzburg, Germany
- Institute for Experimental Biomedicine, University Hospital Würzburg, Josef-Schneider-Straße 2, 97080 Würzburg, Germany
| | - Thomas Kampf
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
- Diagnostic and Interventional Neuroradiology, University Hospital Würzburg, Josef-Schneider-Straße 11, 97080 Würzburg, Germany
| | | | - Julius Heidenreich
- Medical Clinic and Policlinic I, University Wuerzburg, Oberdürrbacher Straße 6, 97080 Würzburg, Germany
| | - Alma Zernecke
- Institute for Experimental Biomedicine, University Hospital Würzburg, Josef-Schneider-Straße 2, 97080 Würzburg, Germany
| | - Wolfgang Rudolf Bauer
- Medical Clinic and Policlinic I, University Wuerzburg, Oberdürrbacher Straße 6, 97080 Würzburg, Germany
| | - Peter Michael Jakob
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Volker Herold
- Experimental Physiks V, University of Würzburg, Am Hubland, 97074 Würzburg, Germany
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Gruber E, Heyward C, Cameron J, Leifer C. Toll-like receptor signaling in macrophages is regulated by extracellular substrate stiffness and Rho-associated coiled-coil kinase (ROCK1/2). Int Immunol 2019; 30:267-278. [PMID: 29800294 DOI: 10.1093/intimm/dxy027] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 04/04/2018] [Indexed: 02/07/2023] Open
Abstract
Macrophages participate in immunity, tissue repair and tissue homeostasis. Activation of Toll-like receptors (TLRs) by conserved exogenous or endogenous structures initiates signaling cascades that result in the release of cytokines such as tumor necrosis factor α (TNFα). Extracellular substrate stiffness is known to regulate functions of non-immune cells through a process called mechanotransduction, yet less is known about how physical cues affect macrophage function or TLR signaling. To investigate this question, we cultured murine primary bone marrow-derived macrophages (BMMs) and RAW264.7 cells on fibronectin-coated polyacrylamide (PA) gels of defined stiffnesses (1, 20 and 150 kPa) that approximate the physical properties of physiologic tissues. BMMs on all gels were smaller and more circular than those on rigid glass. Macrophages on intermediate stiffness 20 kPa PA gels were slightly larger and less circular than those on either 1 or 150 kPa. Secretion of the pro-inflammatory cytokine, TNFα, in response to stimulation of TLR4 and TLR9 was increased in macrophages grown on soft gels versus more rigid gels, particularly for BMMs. Inhibition of the rho-associated coiled-coil kinase 1/2 (ROCK1/2), key mediators in cell contractility and mechanotransduction, enhanced release of TNFα in response to stimulation of TLR4. ROCK1/2 inhibition enhanced phosphorylation of the TLR downstream signaling molecules, p38, ERK1/2 and NFκB. Our data indicate that physical cues from the extracellular environment regulate macrophage morphology and TLR signaling. These findings have important implications in the regulation of macrophage function in diseased tissues and offer a novel pharmacological target for the manipulation of macrophage function in vivo.
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Affiliation(s)
- Erika Gruber
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA
| | - Christa Heyward
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA
| | - Jody Cameron
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA
| | - Cynthia Leifer
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, USA
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Peper ES, Strijkers GJ, Gazzola K, Potters WV, Motaal AG, Luirink IK, Hutten BA, Wiegman A, van Ooij P, van den Born BJH, Nederveen AJ, Coolen BF. Regional assessment of carotid artery pulse wave velocity using compressed sensing accelerated high temporal resolution 2D CINE phase contrast cardiovascular magnetic resonance. J Cardiovasc Magn Reson 2018; 20:86. [PMID: 30567566 PMCID: PMC6300923 DOI: 10.1186/s12968-018-0499-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 10/23/2018] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND Cardiovascular magnetic resonance (CMR) allows for non-invasive assessment of arterial stiffness by means of measuring pulse wave velocity (PWV). PWV can be calculated from the time shift between two time-resolved flow curves acquired at two locations within an arterial segment. These flow curves can be derived from two-dimensional CINE phase contrast CMR (2D CINE PC CMR). While CMR-derived PWV measurements have proven to be accurate for the aorta, this is more challenging for smaller arteries such as the carotids due to the need for both high spatial and temporal resolution. In this work, we present a novel method that combines retrospectively gated 2D CINE PC CMR, high temporal binning of data and compressed sensing (CS) reconstruction to accomplish a temporal resolution of 4 ms. This enables accurate flow measurements and assessment of PWV in regional carotid artery segments. METHODS Retrospectively gated 2D CINE PC CMR data acquired in the carotid artery was binned into cardiac frames of 4 ms length, resulting in an incoherently undersampled ky-t-space with a mean undersampling factor of 5. The images were reconstructed by a non-linear CS reconstruction using total variation over time as a sparsifying transform. PWV values were calculated from flow curves by using foot-to-foot and cross-correlation methods. Our method was validated against ultrasound measurements in a flow phantom setup representing the carotid artery. Additionally, PWV values of two groups of 23 young (30 ± 3 years, 12 [52%] women) and 10 elderly (62 ± 10 years, 5 [50%] women) healthy subjects were compared using the Wilcoxon rank-sum test. RESULTS Our proposed method produced very similar flow curves as those measured using ultrasound at 1 ms temporal resolution. Reliable PWV estimation proved possible for transit times down to 7.5 ms. Furthermore, significant differences in PWV values between healthy young and elderly subjects were found (4.7 ± 1.0 m/s and 7.9 ± 2.4 m/s, respectively; p < 0.001) in accordance with literature. CONCLUSIONS Retrospectively gated 2D CINE PC CMR with CS allows for high spatiotemporal resolution flow measurements and accurate regional carotid artery PWV calculations. We foresee this technique will be valuable in protocols investigating early development of carotid atherosclerosis.
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Affiliation(s)
- Eva S Peper
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Gustav J Strijkers
- Department of Biomedical Engineering and Physics, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Katja Gazzola
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Wouter V Potters
- Department of Neurology, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | | | - Ilse K Luirink
- Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
- Department of Pediatrics Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Barbara A Hutten
- Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Albert Wiegman
- Department of Pediatrics Emma Children's Hospital, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Pim van Ooij
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Bert-Jan H van den Born
- Department of Vascular Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Aart J Nederveen
- Department of Radiology and Nuclear Medicine, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Bram F Coolen
- Department of Biomedical Engineering and Physics, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands.
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Pan FS, Xu M, Yu L, Luo J, Li MY, Liang JY, Zheng YL, Xie XY. Relationship between carotid intima-media thickness and carotid artery stiffness assessed by ultrafast ultrasound imaging in patients with type 2 diabetes. Eur J Radiol 2018; 111:34-40. [PMID: 30691662 DOI: 10.1016/j.ejrad.2018.12.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 12/03/2018] [Accepted: 12/13/2018] [Indexed: 01/21/2023]
Abstract
OBJECTIVES To evaluate the relationship between carotid stiffness and carotid intima-media thickness (CIMT) in patients with type 2 diabetes (T2DM). MATERIALS AND METHODS Carotid properties were evaluated in 317 consecutive subjects (98 volunteers for controls, 105 patients with normal CIMT for T2DM group 1, and 114 patients with thickened CIMT for T2DM group 2). The CIMT and carotid pulse wave velocity at the beginning (PWV-BS) and at the end of systole (PWV-ES) were measured. RESULTS Apart from PWV-BS in T2DM group 1, CIMT and PWV-ES were significant higher in patients groups than those of in controls. In multiple regression analysis, diabetes was independently associated with PWV-ES and not with PWV-BS. Moreover, when adjusting for baseline covariates, only PWV-ES (odds ratio = 4.27, P < 0.001) distinguished carotid in T2DM group 1 from that of controls. Concerning the relationship between log(CIMT) and PWV-ES, when adjusting for baseline covariates, the association were still significant in controls and T2DM group 1, whereas it was no longer present in T2DM group 2 (P = 0.091). Additionally, the slope (β) after adjustment for the PWV-ES to log(CIMT) was significantly steeper in T2DM group 1 than that of in controls (β= 8.35 vs. 3.31, P < 0.01). CONCLUSIONS The PWV-ES seem to be a better biomarker candidate than PWV-BS to assess the carotid stiffness in diabetic patients. Compared with controls, diabetic patients showed more advanced functional changes than morphological changes despite normal CIMT, whereas the relationship trend was not present when thickened CIMT emerged.
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Affiliation(s)
- Fu-Shun Pan
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
| | - Ming Xu
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
| | - Liang Yu
- Department of Vascular and Thyroid Surgery, The First Affiliated Hospital of Sun Yat-sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
| | - Jia Luo
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
| | - Man-Ying Li
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
| | - Jin-Yu Liang
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
| | - Yan-Ling Zheng
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
| | - Xiao-Yan Xie
- Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, the First Affiliated Hospital, Sun Yat-Sen University, 58 Zhongshan Road 2, Guangzhou, 510080, PR China.
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Aydoğan Y, Altay M, Ünsal O, Kaplanoğlu V, Çağır Y, Yıldız C, Beyan E, Ramadan SU. An assessment of the relationship between thyroid nodule characteristics, insulin resistance and arterial stiffness in euthyroid nodular goiter. Endocrine 2018; 62:440-447. [PMID: 30084100 DOI: 10.1007/s12020-018-1701-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 07/26/2018] [Indexed: 10/28/2022]
Abstract
OBJECTIVES Publications suggesting that thyroid nodule might be associated with insulin resistance and metabolic syndrome are quite interesting. There is a need for studies assessing the relationship between nodule presence and cardiovascular risk in individuals with non-functioning nodular goiter. The purpose of the present study is to reveal whether or not insulin resistance, nodule presence, and nodule stiffness affect arterial stiffness, which is a reliable and valid cardiovascular risk indicator, in individuals with euthyroid nodular goiter using the pulse wave analysis (PWA). MATERIALS AND METHODS 50 patients with euthyroid nodular goiter and 50 healthy volunteers were included in the study. All participants were examined by B-mode thyroid ultrasound, and the participants in the nodular goiter group were also examined by strain elastography (SE). The strain index of nodules was calculated according to the Rago scoring. Also, fasting plasma glucose (FPG) and insulin levels were measured, and HOMA-IR. Arterial stiffness measurements of the participants were performed using a PWA device which employs a cuff-based oscillometric method from the brachial artery. RESULTS PWV was found to be significantly higher in the euthyroid nodular goiter group (p < 0.001). PWV was found to be positively correlated with FPG and waist circumference. Fasting plasma glucose was found to be higher in the group with nodular goiter (p = 0.03). However, no difference was found between the groups in terms of HOMA-IR and insulin level. HOMA-IR was not correlated with thyroid volume, nodule volume, and nodule count. Also, HOMA-IR was not correlated with strain index value and PWA data. CONCLUSION We found that PWV was significantly higher in patients with euthyroid nodular goiter. This result suggests that these patients may be at risk for cardiovascular disease.
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Affiliation(s)
| | - Mustafa Altay
- Department of Endocrinology, Keçiören Training and Research Hospital, Ankara, Turkey
| | - Oktay Ünsal
- Department of Nefrology, Uludağ University Medical Faculty Hospital, Bursa, Turkey
| | - Veysel Kaplanoğlu
- Department of Radiology, Keçiören Training ad Research Hospital, Ankara, Turkey
| | - Yavuz Çağır
- Çankırı Çerkeş State Hospital, Çankırı, Turkey
| | - Canan Yıldız
- Aydın Didim State Hospital, Aydın, Didim, Turkey
| | - Esin Beyan
- Department of Internal Medicine, Keçiören Training and Research Hospital, Ankara, Turkey
| | - Selma Uysal Ramadan
- Deparment of Radiology, Keçiören Training and Research Hospital, Ankara, Turkey
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21
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Lim HY, Lim SY, Tan CK, Thiam CH, Goh CC, Carbajo D, Chew SHS, See P, Chakarov S, Wang XN, Lim LH, Johnson LA, Lum J, Fong CY, Bongso A, Biswas A, Goh C, Evrard M, Yeo KP, Basu R, Wang JK, Tan Y, Jain R, Tikoo S, Choong C, Weninger W, Poidinger M, Stanley RE, Collin M, Tan NS, Ng LG, Jackson DG, Ginhoux F, Angeli V. Hyaluronan Receptor LYVE-1-Expressing Macrophages Maintain Arterial Tone through Hyaluronan-Mediated Regulation of Smooth Muscle Cell Collagen. Immunity 2018; 49:326-341.e7. [PMID: 30054204 DOI: 10.1016/j.immuni.2018.06.008] [Citation(s) in RCA: 185] [Impact Index Per Article: 30.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2017] [Revised: 04/01/2018] [Accepted: 06/15/2018] [Indexed: 02/06/2023]
Abstract
The maintenance of appropriate arterial tone is critically important for normal physiological arterial function. However, the cellular and molecular mechanisms remain poorly defined. Here, we have shown that in the mouse aorta, resident macrophages prevented arterial stiffness and collagen deposition in the steady state. Using phenotyping, transcriptional profiling, and targeted deletion of Csf1r, we have demonstrated that these macrophages-which are a feature of blood vessels invested with smooth muscle cells (SMCs) in both mouse and human tissues-expressed the hyaluronan (HA) receptor LYVE-l. Furthermore, we have shown they possessed the unique ability to modulate collagen expression in SMCs by matrix metalloproteinase MMP-9-dependent proteolysis through engagement of LYVE-1 with the HA pericellular matrix of SMCs. Our study has unveiled a hitherto unknown homeostatic contribution of arterial LYVE-1+ macrophages through the control of collagen production by SMCs and has identified a function of LYVE-1 in leukocytes.
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Affiliation(s)
- Hwee Ying Lim
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Sheau Yng Lim
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Chek Kun Tan
- School of Biological Sciences, Nanyang Technological University, Nanyang, Singapore 637551, Singapore
| | - Chung Hwee Thiam
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Chi Ching Goh
- Singapore Immunology Network, A(∗)STAR, Singapore 138648, Singapore
| | - Daniel Carbajo
- Singapore Immunology Network, A(∗)STAR, Singapore 138648, Singapore
| | - Samantha Hui Shang Chew
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Peter See
- Singapore Immunology Network, A(∗)STAR, Singapore 138648, Singapore
| | | | - Xiao Nong Wang
- Institute of Cellular Medicine, Newcastle University, Newcastle NE2 4HH, UK
| | - Li Hui Lim
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Louise A Johnson
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliff Hospital, Oxford OX3 9DS, UK
| | - Josephine Lum
- Singapore Immunology Network, A(∗)STAR, Singapore 138648, Singapore
| | - Chui Yee Fong
- Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, Singapore 119074, Singapore
| | - Ariff Bongso
- Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, Singapore 119074, Singapore
| | - Arijit Biswas
- Department of Obstetrics and Gynaecology, Yong Loo Lin School of Medicine, National University Health System, National University of Singapore, Singapore 119074, Singapore
| | - Chern Goh
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | | | - Kim Pin Yeo
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
| | - Ranu Basu
- Department of Development and Molecular Biology, Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Jun Kit Wang
- School of Material Science and Engineering, Nanyang Technological University, Singapore 639977, Singapore
| | - Yingrou Tan
- Singapore Immunology Network, A(∗)STAR, Singapore 138648, Singapore
| | - Rohit Jain
- The Centenary Institute, Newtown, NSW 2050, Australia
| | - Shweta Tikoo
- The Centenary Institute, Newtown, NSW 2050, Australia
| | - Cleo Choong
- School of Material Science and Engineering, Nanyang Technological University, Singapore 639977, Singapore
| | | | | | - Richard E Stanley
- Department of Development and Molecular Biology, Albert Einstein College of Medicine, New York, NY 10461, USA
| | - Matthew Collin
- Institute of Cellular Medicine, Newcastle University, Newcastle NE2 4HH, UK
| | - Nguan Soon Tan
- School of Biological Sciences, Nanyang Technological University, Nanyang, Singapore 637551, Singapore; Institute of Molecular and Cell Biology, A(∗)STAR, Singapore 138673, Singapore; KK Women's and Children Hospital, Singapore 229899, Singapore
| | - Lai Guan Ng
- Singapore Immunology Network, A(∗)STAR, Singapore 138648, Singapore
| | - David G Jackson
- MRC Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliff Hospital, Oxford OX3 9DS, UK
| | - Florent Ginhoux
- Singapore Immunology Network, A(∗)STAR, Singapore 138648, Singapore
| | - Véronique Angeli
- Department of Microbiology & Immunology, Immunology Programme, Life Science Institute, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore.
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22
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Okamoto T, Takagi Y, Kawamoto E, Park EJ, Usuda H, Wada K, Shimaoka M. Reduced substrate stiffness promotes M2-like macrophage activation and enhances peroxisome proliferator-activated receptor γ expression. Exp Cell Res 2018; 367:264-273. [PMID: 29627321 DOI: 10.1016/j.yexcr.2018.04.005] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Revised: 03/30/2018] [Accepted: 04/04/2018] [Indexed: 01/22/2023]
Abstract
The increased stiffness of the extracellular microenvironment observed in cancer and atherosclerosis is thought to regulate the activation of tissue-resident immune cells. However, it remains to be determined whether such substrate stiffness affects macrophage activation phenotypes. Here, we have studied the impact of substrate stiffness on in vitro activation phenotypes of the human monocyte cell line THP-1. THP-1 cells were activated while being cultured on 1%, 4%, 10% agarose gel (soft substrate) or on a plastic plate (stiff substrate). We have shown that a soft, versus a stiff, substrate attenuates the pro-inflammatory activity of M1 promoting-activated THP-1 cells. In addition, we have found that M1-related marker expression and phagocytic activity was lower in THP-1 cells activated on a soft substrate compared to cells on stiff substrates. THP-1 cells alternatively activated on soft substrates showed enhanced M2-like phenotypes. We have found that peroxisome proliferator-activated receptor γ (PPARγ) expression was up-regulated in THP-1 cells activated on a soft substrate. We have shown that the PPARγ antagonist GW9662 partially suppresses M2-like activation of THP-1 cells activated on a soft substrate. Substrate stiffness is, therefore, an important factor in regulating the balance of the pro-inflammatory M1 and anti-inflammatory M2 activation phenotypes.
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Affiliation(s)
- Takayuki Okamoto
- Department of Pharmacology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo-city, Shimane 693-8501, Japan; Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan.
| | - Yoshimi Takagi
- Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan
| | - Eiji Kawamoto
- Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan; Emergency and Critical Care Center, Mie University Hospital, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan
| | - Eun Jeong Park
- Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan
| | - Haruki Usuda
- Department of Pharmacology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo-city, Shimane 693-8501, Japan
| | - Koichiro Wada
- Department of Pharmacology, Faculty of Medicine, Shimane University, 89-1 Enya-cho, Izumo-city, Shimane 693-8501, Japan
| | - Motomu Shimaoka
- Department of Molecular Pathobiology and Cell Adhesion Biology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu-city, Mie 514-8507, Japan.
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23
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Herold V, Herz S, Winter P, Gutjahr FT, Andelovic K, Bauer WR, Jakob PM. Assessment of local pulse wave velocity distribution in mice using k-t BLAST PC-CMR with semi-automatic area segmentation. J Cardiovasc Magn Reson 2017; 19:77. [PMID: 29037199 PMCID: PMC5641989 DOI: 10.1186/s12968-017-0382-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Accepted: 08/22/2017] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Local aortic pulse wave velocity (PWV) is a measure for vascular stiffness and has a predictive value for cardiovascular events. Ultra high field CMR scanners allow the quantification of local PWV in mice, however these systems are yet unable to monitor the distribution of local elasticities. METHODS In the present study we provide a new accelerated method to quantify local aortic PWV in mice with phase-contrast cardiovascular magnetic resonance imaging (PC-CMR) at 17.6 T. Based on a k-t BLAST (Broad-use Linear Acquisition Speed-up Technique) undersampling scheme, total measurement time could be reduced by a factor of 6. The fast data acquisition enables to quantify the local PWV at several locations along the aortic blood vessel based on the evaluation of local temporal changes in blood flow and vessel cross sectional area. To speed up post processing and to eliminate operator bias, we introduce a new semi-automatic segmentation algorithm to quantify cross-sectional areas of the aortic vessel. The new methods were applied in 10 eight-month-old mice (4 C57BL/6J-mice and 6 ApoE (-/-)-mice) at 12 adjacent locations along the abdominal aorta. RESULTS Accelerated data acquisition and semi-automatic post-processing delivered reliable measures for the local PWV, similiar to those obtained with full data sampling and manual segmentation. No statistically significant differences of the mean values could be detected for the different measurement approaches. Mean PWV values were elevated for the ApoE (-/-)-group compared to the C57BL/6J-group (3.5 ± 0.7 m/s vs. 2.2 ± 0.4 m/s, p < 0.01). A more heterogeneous PWV-distribution in the ApoE (-/-)-animals could be observed compared to the C57BL/6J-mice, representing the local character of lesion development in atherosclerosis. CONCLUSION In the present work, we showed that k-t BLAST PC-MRI enables the measurement of the local PWV distribution in the mouse aorta. The semi-automatic segmentation method based on PC-CMR data allowed rapid determination of local PWV. The findings of this study demonstrate the ability of the proposed methods to non-invasively quantify the spatial variations in local PWV along the aorta of ApoE (-/-)-mice as a relevant model of atherosclerosis.
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Affiliation(s)
- Volker Herold
- Department of Experimental Physics, University of Würzburg, Am Hubland, Würzburg, 97074 Germany
| | - Stefan Herz
- Comprehensive Heart Failure Center/Deutsches Zentrum für Herzinsuffizienz, University of Würzburg, Würzburg, Germany
| | - Patrick Winter
- Department of Experimental Physics, University of Würzburg, Am Hubland, Würzburg, 97074 Germany
| | - Fabian Tobias Gutjahr
- Department of Experimental Physics, University of Würzburg, Am Hubland, Würzburg, 97074 Germany
| | - Kristina Andelovic
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
| | | | - Peter Michael Jakob
- Department of Experimental Physics, University of Würzburg, Am Hubland, Würzburg, 97074 Germany
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24
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Lacolley P, Regnault V, Segers P, Laurent S. Vascular Smooth Muscle Cells and Arterial Stiffening: Relevance in Development, Aging, and Disease. Physiol Rev 2017; 97:1555-1617. [DOI: 10.1152/physrev.00003.2017] [Citation(s) in RCA: 332] [Impact Index Per Article: 47.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2017] [Revised: 05/15/2017] [Accepted: 05/26/2017] [Indexed: 12/18/2022] Open
Abstract
The cushioning function of large arteries encompasses distension during systole and recoil during diastole which transforms pulsatile flow into a steady flow in the microcirculation. Arterial stiffness, the inverse of distensibility, has been implicated in various etiologies of chronic common and monogenic cardiovascular diseases and is a major cause of morbidity and mortality globally. The first components that contribute to arterial stiffening are extracellular matrix (ECM) proteins that support the mechanical load, while the second important components are vascular smooth muscle cells (VSMCs), which not only regulate actomyosin interactions for contraction but mediate also mechanotransduction in cell-ECM homeostasis. Eventually, VSMC plasticity and signaling in both conductance and resistance arteries are highly relevant to the physiology of normal and early vascular aging. This review summarizes current concepts of central pressure and tensile pulsatile circumferential stress as key mechanical determinants of arterial wall remodeling, cell-ECM interactions depending mainly on the architecture of cytoskeletal proteins and focal adhesion, the large/small arteries cross-talk that gives rise to target organ damage, and inflammatory pathways leading to calcification or atherosclerosis. We further speculate on the contribution of cellular stiffness along the arterial tree to vascular wall stiffness. In addition, this review provides the latest advances in the identification of gene variants affecting arterial stiffening. Now that important hemodynamic and molecular mechanisms of arterial stiffness have been elucidated, and the complex interplay between ECM, cells, and sensors identified, further research should study their potential to halt or to reverse the development of arterial stiffness.
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Affiliation(s)
- Patrick Lacolley
- INSERM, U1116, Vandœuvre-lès-Nancy, France; Université de Lorraine, Nancy, France; IBiTech-bioMMeda, Department of Electronics and Information Systems, Ghent University, Gent, Belgium; Department of Pharmacology, European Georges Pompidou Hospital, Assistance Publique Hôpitaux de Paris, France; PARCC INSERM, UMR 970, Paris, France; and University Paris Descartes, Paris, France
| | - Véronique Regnault
- INSERM, U1116, Vandœuvre-lès-Nancy, France; Université de Lorraine, Nancy, France; IBiTech-bioMMeda, Department of Electronics and Information Systems, Ghent University, Gent, Belgium; Department of Pharmacology, European Georges Pompidou Hospital, Assistance Publique Hôpitaux de Paris, France; PARCC INSERM, UMR 970, Paris, France; and University Paris Descartes, Paris, France
| | - Patrick Segers
- INSERM, U1116, Vandœuvre-lès-Nancy, France; Université de Lorraine, Nancy, France; IBiTech-bioMMeda, Department of Electronics and Information Systems, Ghent University, Gent, Belgium; Department of Pharmacology, European Georges Pompidou Hospital, Assistance Publique Hôpitaux de Paris, France; PARCC INSERM, UMR 970, Paris, France; and University Paris Descartes, Paris, France
| | - Stéphane Laurent
- INSERM, U1116, Vandœuvre-lès-Nancy, France; Université de Lorraine, Nancy, France; IBiTech-bioMMeda, Department of Electronics and Information Systems, Ghent University, Gent, Belgium; Department of Pharmacology, European Georges Pompidou Hospital, Assistance Publique Hôpitaux de Paris, France; PARCC INSERM, UMR 970, Paris, France; and University Paris Descartes, Paris, France
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25
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Kim CW, Pokutta-Paskaleva A, Kumar S, Timmins LH, Morris AD, Kang DW, Dalal S, Chadid T, Kuo KM, Raykin J, Li H, Yanagisawa H, Gleason RL, Jo H, Brewster LP. Disturbed Flow Promotes Arterial Stiffening Through Thrombospondin-1. Circulation 2017; 136:1217-1232. [PMID: 28778947 DOI: 10.1161/circulationaha.116.026361] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 07/26/2017] [Indexed: 12/18/2022]
Abstract
BACKGROUND Arterial stiffness and wall shear stress are powerful determinants of cardiovascular health, and arterial stiffness is associated with increased cardiovascular mortality. Low and oscillatory wall shear stress, termed disturbed flow (d-flow), promotes atherosclerotic arterial remodeling, but the relationship between d-flow and arterial stiffness is not well understood. The objective of this study was to define the role of d-flow on arterial stiffening and discover the relevant signaling pathways by which d-flow stiffens arteries. METHODS D-flow was induced in the carotid arteries of young and old mice of both sexes. Arterial stiffness was quantified ex vivo with cylindrical biaxial mechanical testing and in vivo from duplex ultrasound and compared with unmanipulated carotid arteries from 80-week-old mice. Gene expression and pathway analysis was performed on endothelial cell-enriched RNA and validated by immunohistochemistry. In vitro testing of signaling pathways was performed under oscillatory and laminar wall shear stress conditions. Human arteries from regions of d-flow and stable flow were tested ex vivo to validate critical results from the animal model. RESULTS D-flow induced arterial stiffening through collagen deposition after partial carotid ligation, and the degree of stiffening was similar to that of unmanipulated carotid arteries from 80-week-old mice. Intimal gene pathway analyses identified transforming growth factor-β pathways as having a prominent role in this stiffened arterial response, but this was attributable to thrombospondin-1 (TSP-1) stimulation of profibrotic genes and not changes to transforming growth factor-β. In vitro and in vivo testing under d-flow conditions identified a possible role for TSP-1 activation of transforming growth factor-β in the upregulation of these genes. TSP-1 knockout animals had significantly less arterial stiffening in response to d-flow than wild-type carotid arteries. Human arteries exposed to d-flow had similar increases TSP-1 and collagen gene expression as seen in our model. CONCLUSIONS TSP-1 has a critical role in shear-mediated arterial stiffening that is mediated in part through TSP-1's activation of the profibrotic signaling pathways of transforming growth factor-β. Molecular targets in this pathway may lead to novel therapies to limit arterial stiffening and the progression of disease in arteries exposed to d-flow.
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Affiliation(s)
- Chan Woo Kim
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Anastassia Pokutta-Paskaleva
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Sandeep Kumar
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Lucas H Timmins
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Andrew D Morris
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Dong-Won Kang
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Sidd Dalal
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Tatiana Chadid
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Katie M Kuo
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Julia Raykin
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Haiyan Li
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Hiromi Yanagisawa
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Rudolph L Gleason
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.)
| | - Hanjoong Jo
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.).
| | - Luke P Brewster
- From Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta (C.W.K., A.P.-P., S.K., D.-W.K., J.R., R.L.G., H.J., L.P.B.); Department of Microbiology, College of Medicine, Inha University, Incheon, Republic of Korea (C.W.K.); Department of Surgery, Emory University, Atlanta, GA (A.P.-P., A.D.M., T.C., K.M.K., H.L., L.P.B.); Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA (L.H.T.); Department of Bioengineering, University of Utah, Salt Lake City (L.H.T.); Mercer University School of Medicine, Macon, GA (S.D.); Life Science Center, Tsukuba Advanced Research Alliance, University of Tsukuba, Ibaraki, Japan (H.Y.); George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta (R.L.G.); Surgical and Research Services, Atlanta VA Medical Center, Decatur, GA (L.P.B.); and Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta (L.P.B.).
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26
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Wu YL, Lo CW. Diverse application of MRI for mouse phenotyping. Birth Defects Res 2017; 109:758-770. [PMID: 28544650 DOI: 10.1002/bdr2.1051] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 04/15/2017] [Indexed: 02/01/2023]
Abstract
Small animal models, particularly mouse models, of human diseases are becoming an indispensable tool for biomedical research. Studies in animal models have provided important insights into the etiology of diseases and accelerated the development of therapeutic strategies. Detailed phenotypic characterization is essential, both for the development of such animal models and mechanistic studies into disease pathogenesis and testing the efficacy of experimental therapeutics. MRI is a versatile and noninvasive imaging modality with excellent penetration depth, tissue coverage, and soft tissue contrast. MRI, being a multi-modal imaging modality, together with proven imaging protocols and availability of good contrast agents, is ideally suited for phenotyping mutant mouse models. Here we describe the applications of MRI for phenotyping structural birth defects involving the brain, heart, and kidney in mice. The versatility of MRI and its ease of use are well suited to meet the rapidly increasing demands for mouse phenotyping in the coming age of functional genomics. Birth Defects Research 109:758-770, 2017. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Yijen L Wu
- Department of Developmental Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.,Rangos Research Center Animal Imaging Core, Children's Hospital of Pittsburgh, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Cecilia W Lo
- Department of Developmental Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
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27
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Bar A, Olkowicz M, Tyrankiewicz U, Kus E, Jasinski K, Smolenski RT, Skorka T, Chlopicki S. Functional and Biochemical Endothelial Profiling In Vivo in a Murine Model of Endothelial Dysfunction; Comparison of Effects of 1-Methylnicotinamide and Angiotensin-converting Enzyme Inhibitor. Front Pharmacol 2017; 8:183. [PMID: 28443021 PMCID: PMC5385379 DOI: 10.3389/fphar.2017.00183] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Accepted: 03/21/2017] [Indexed: 12/20/2022] Open
Abstract
Although it is known that 1-methylnicotinamide (MNA) displays vasoprotective activity in mice, as yet the effect of MNA on endothelial function has not been demonstrated in vivo. Here, using magnetic resonance imaging (MRI) we profile the effects of MNA on endothelial phenotype in mice with atherosclerosis (ApoE/LDLR-/-) in vivo, in comparison to angiotensin (Ang) -converting enzyme (ACE) inhibitor (perindopril), with known vasoprotective activity. On a biochemical level, we analyzed whether MNA- or perindopril-induced improvement in endothelial function results in changes in ACE/Ang II-ACE2/Ang-(1–7) balance, and L-arginine/asymmetric dimethylarginine (ADMA) ratio. Endothelial function and permeability were evaluated in the brachiocephalic artery (BCA) in 4-month-old ApoE/LDLR-/- mice that were non-treated or treated for 1 month or 2 months with either MNA (100 mg/kg/day) or perindopril (10 mg/kg/day). The 3D IntraGate®FLASH sequence was used for evaluation of BCA volume changes following acetylcholine (Ach) administration, and for relaxation time (T1) mapping around BCA to assess endothelial permeability using an intravascular contrast agent. Activity of ACE/Ang II and ACE2/Ang-(1–7) pathways as well as metabolites of L-arginine/ADMA pathway were measured using liquid chromatography/mass spectrometry-based methods. In non-treated 6-month-old ApoE/LDLR-/- mice, Ach induced a vasoconstriction in BCA that amounted to –7.2%. 2-month treatment with either MNA or perindopril resulted in the reversal of impaired Ach-induced response to vasodilatation (4.5 and 5.5%, respectively) and a decrease in endothelial permeability (by about 60% for MNA-, as well as perindopril-treated mice). Improvement of endothelial function by MNA and perindopril was in both cases associated with the activation of ACE2/Ang-(1–7) and the inhibition of ACE/Ang II axes as evidenced by an approximately twofold increase in Ang-(1–9) and Ang-(1–7) and a proportional decrease in Ang II and its active metabolites. Finally, MNA and perindopril treatment resulted in an increase in L-arginine/ADMA ratio by 107% (MNA) and 140% (perindopril), as compared to non-treated mice. Functional and biochemical endothelial profiling in ApoE/LDLR-/- mice in vivo revealed that 2-month treatment with MNA (100 mg/kg/day) displayed a similar profile of vasoprotective effect as 2-month treatment with perindopril (10 mg/kg/day): i.e., the improvement in endothelial function that was associated with the beneficial changes in ACE/Ang II-ACE2/Ang (1–7) balance and in L-arginine/ADMA ratio in plasma.
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Affiliation(s)
- Anna Bar
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian UniversityKrakow, Poland.,Chair of Pharmacology, Jagiellonian University Medical CollegeKrakow, Poland
| | - Mariola Olkowicz
- Department of Biochemistry, Medical University of GdanskGdansk, Poland.,Department of Biotechnology and Food Microbiology, Poznan University of Life SciencesPoznan, Poland
| | - Urszula Tyrankiewicz
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian UniversityKrakow, Poland
| | - Edyta Kus
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian UniversityKrakow, Poland
| | - Krzysztof Jasinski
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics Polish Academy of SciencesKrakow, Poland
| | | | - Tomasz Skorka
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics Polish Academy of SciencesKrakow, Poland
| | - Stefan Chlopicki
- Jagiellonian Centre for Experimental Therapeutics, Jagiellonian UniversityKrakow, Poland.,Chair of Pharmacology, Jagiellonian University Medical CollegeKrakow, Poland
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28
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Gotschy A, Bauer WR, Winter P, Nordbeck P, Rommel E, Jakob PM, Herold V. Local versus global aortic pulse wave velocity in early atherosclerosis: An animal study in ApoE-/--mice using ultrahigh field MRI. PLoS One 2017; 12:e0171603. [PMID: 28207773 PMCID: PMC5313136 DOI: 10.1371/journal.pone.0171603] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Accepted: 01/23/2017] [Indexed: 11/25/2022] Open
Abstract
Increased aortic stiffness is known to be associated with atherosclerosis and has a predictive value for cardiovascular events. This study aims to investigate the local distribution of early arterial stiffening due to initial atherosclerotic lesions. Therefore, global and local pulse wave velocity (PWV) were measured in ApoE-/- and wild type (WT) mice using ultrahigh field MRI. For quantification of global aortic stiffness, a new multi-point transit-time (TT) method was implemented and validated to determine the global PWV in the murine aorta. Local aortic stiffness was measured by assessing the local PWV in the upper abdominal aorta, using the flow/area (QA) method. Significant differences between age matched ApoE-/- and WT mice were determined for global and local PWV measurements (global PWV: ApoE-/-: 2.7±0.2m/s vs WT: 2.1±0.2m/s, P<0.03; local PWV: ApoE-/-: 2.9±0.2m/s vs WT: 2.2±0.2m/s, P<0.03). Within the WT mouse group, the global PWV correlated well with the local PWV in the upper abdominal aorta (R2 = 0.75, P<0.01), implying a widely uniform arterial elasticity. In ApoE-/- animals, however, no significant correlation between individual local and global PWV was present (R2 = 0.07, P = 0.53), implying a heterogeneous distribution of vascular stiffening in early atherosclerosis. The assessment of global PWV using the new multi-point TT measurement technique was validated against a pressure wire measurement in a vessel phantom and showed excellent agreement. The experimental results demonstrate that vascular stiffening caused by early atherosclerosis is unequally distributed over the length of large vessels. This finding implies that assessing heterogeneity of arterial stiffness by multiple local measurements of PWV might be more sensitive than global PWV to identify early atherosclerotic lesions.
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Affiliation(s)
- Alexander Gotschy
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
- Department of Cardiology, University Heart Center, University Hospital Zurich, Zurich, Switzerland
- Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland
- * E-mail:
| | - Wolfgang R. Bauer
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Center / Deutsches Zentrum für Herzinsuffizienz, University of Würzburg, Würzburg, Germany
| | - Patrick Winter
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
| | - Peter Nordbeck
- Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Center / Deutsches Zentrum für Herzinsuffizienz, University of Würzburg, Würzburg, Germany
| | - Eberhard Rommel
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
| | - Peter M. Jakob
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
- Comprehensive Heart Failure Center / Deutsches Zentrum für Herzinsuffizienz, University of Würzburg, Würzburg, Germany
| | - Volker Herold
- Department of Experimental Physics V, University of Würzburg, Würzburg, Germany
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Shang S, Chen Z, Zhao Y, Yang S, Xing D. Simultaneous imaging of atherosclerotic plaque composition and structure with dual-mode photoacoustic and optical coherence tomography. OPTICS EXPRESS 2017; 25:530-539. [PMID: 28157944 DOI: 10.1364/oe.25.000530] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The composition of plaque is a major determinant of coronary-related clinical syndromes. By combining photoacoustic tomography (PAT) and optical coherence tomography (OCT), the optical absorption and scattering properties of vascular plaque can be revealed and subsequently used to distinguish the plaque composition and structure. The feasibility and capacity of the dual-mode PAT-OCT technique for resolving vascular plaque was first testified by plaque composition mimicking experiment. PAT obtained lipid information due to optical absorption differences, while owing to scattering differences, OCT achieved imaging of collagen. Furthermore, by combining PAT and OCT, the morphological characteristic and scattering difference of normal and lipid-rich plaque in the ex vivo rabbit aorta was distinguished simultaneously. The experiments demonstrated that the combined PAT and OCT technique is a potential feasible method for detecting the composition and structure of lipid core and fibrous cap in atherosclerosis.
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30
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Dai E, Dong L, Zhang Z, Li L, Zhang H, Zhao X, Wang J, Yuan C, Guo H. Technical Note: Measurement of common carotid artery lumen dynamics using black-blood MR cine imaging. Med Phys 2017; 44:1105-1112. [PMID: 28100004 DOI: 10.1002/mp.12114] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 10/24/2016] [Accepted: 01/08/2017] [Indexed: 11/11/2022] Open
Abstract
PURPOSE To demonstrate the feasibility of measuring the common carotid artery (CCA) lumen dynamics using a black-blood cine (BB-cine) imaging method. METHODS Motion-sensitized driven-equilibrium (MSDE) prepared spoiled gradient sequence was used for the BB-cine imaging. CCAs of eleven healthy volunteers were studied using this method. Lumen dynamics, including lumen area evolution waveforms and distension values, were measured and evaluated by comparing this method with bright-blood cine (BrB-cine) imaging. RESULTS Compared with the BrB-cine images, flow artifacts were effectively suppressed in the BB-cine images. BrB-cine images generally show larger lumen areas than BB-cine images. The lumen area waveforms and distension measurements from BB-cine imaging showed smaller variances among different subjects than BrB-cine imaging. CONCLUSIONS The proposed BB-cine imaging technique can suppress the flow artifacts effectively and reduce the partial volume effects from the vessel wall. This might allow more accurate lumen dynamics measurements than traditional BrB-cine imaging, which may further be valuable for investigating biomechanical and functional properties of the cardiovascular system.
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Affiliation(s)
- Erpeng Dai
- Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Li Dong
- Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Beijing, 100029, China
| | - Zhe Zhang
- Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Lyu Li
- Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Hui Zhang
- Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Xihai Zhao
- Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
| | - Jinnan Wang
- Clinical Sites Research Program, Philips Research North America, Briarcliff Manor, NY, 10510, USA
| | - Chun Yuan
- Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China.,Department of Radiology, University of Washington, Seattle, WA, 98109, USA
| | - Hua Guo
- Center for Biomedical Imaging Research, Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, 100084, China
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31
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Noninvasive measurement of regional pulse wave velocity in human ascending aorta with ultrasound imaging. J Hypertens 2016; 34:2026-37. [DOI: 10.1097/hjh.0000000000001060] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Tat J, Psaromiligkos IN, Daskalopoulou SS. Carotid Atherosclerotic Plaque Alters the Direction of Longitudinal Motion in the Artery Wall. ULTRASOUND IN MEDICINE & BIOLOGY 2016; 42:2114-2122. [PMID: 27260245 DOI: 10.1016/j.ultrasmedbio.2016.04.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Revised: 04/21/2016] [Accepted: 04/25/2016] [Indexed: 06/05/2023]
Abstract
Longitudinal motion of the artery, a cyclical, bidirectional movement of the wall in the long axis of the artery, has recently gained interest in the characterization of artery function. The aim of this study was to evaluate longitudinal motion in patients with internal carotid atherosclerotic plaques. Speckle tracking ultrasound was used to assess common carotid artery wall motion in 12 patients with carotid plaque causing either moderate (50%-79%) or severe (80%-99%) stenosis based on the North American Carotid Endarterectomy Trial, and 23 healthy participants. Although healthy individuals were found to have a retrograde wall motion pattern, a distinct anterograde pattern was noted with plaque presence. Importantly, patients with severe plaque stenosis had greater anterograde motion (0.53 ± 0.36 mm) than those with moderate stenosis (0.17 ± 0.15 mm) (p < 0.05), likely owing to high wall shear stresses associated with greater peak systolic velocities at the site of stenosis (severe: 342.0 ± 99.4 cm/s, moderate: 177.5 ± 31.2 cm/s, p < 0.01). There were no differences in peak systolic velocities at plaque-free segments between plaque groups (severe: 80.2 ± 24.8 cm/s, moderate: 92.7 ± 23.0 cm/s). Blood flow at stenotic areas better predicted motion than plaque-free segments. We conclude that the presence of carotid plaque can have significant influence on longitudinal motion, with significantly greater anterograde displacements with increased stenosis. Future studies are needed to further investigate carotid artery wall mechanics.
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Affiliation(s)
- Jimmy Tat
- Department of Medicine, McGill University, Montreal, Quebec, Canada
| | - Ioannis N Psaromiligkos
- Department of Electrical and Computer Engineering, McGill University, Montreal, Quebec, Canada
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33
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Bar A, Skórka T, Jasiński K, Sternak M, Bartel Ż, Tyrankiewicz U, Chlopicki S. Retrospectively gated MRI for in vivo assessment of endothelium-dependent vasodilatation and endothelial permeability in murine models of endothelial dysfunction. NMR IN BIOMEDICINE 2016; 29:1088-97. [PMID: 27348596 DOI: 10.1002/nbm.3567] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 04/17/2016] [Accepted: 05/11/2016] [Indexed: 05/28/2023]
Abstract
Endothelial dysfunction is linked to impaired endothelial-dependent vasodilatation and permeability changes. Here, we quantify both of these phenomena associated with endothelial dysfunction by MRI in vivo in mice. Endothelial function was evaluated in the brachiocephalic artery (BCA) and left carotid artery (LCA) in ApoE/LDLR(-/-) and high-fat diet (HFD)-fed mice as compared with control mice (C57BL/6J). The 3D IntraGate® FLASH sequence was used for evaluation of changes in vessels' cross-sectional area (CSA) and volume following acetylcholine (Ach) administration. Evaluation of endothelial permeability after administration of contrast agent (Galbumin, BioPAL) was based on the variable flip angle method for the assessment of parameters based on the relaxation time (T1 ) value. In order to confirm the involvement of nitric oxide (NO) in response to Ach, L-NAME-treated mice were also analyzed. To confirm that endothelial permeability changes accompany the impairment of Ach-dependent vasodilatation, permeability changes were analyzed in isolated, perfused carotid artery. In C57BL/6J mice, Ach-induced vasodilatation led to an approximately 25% increase in CSA in both vessels, which was temporarily dissociated from the effect of Ach on heart rate. In ApoE/LDLR(-/-) or HFD-fed mice Ach induced a paradoxical vasoconstriction that amounted to approximately 30% and 50% decreases in CSA of BCA and LCA respectively. In ApoE/LDLR(-/-) and HFD-fed mice endothelial permeability in BCA was also increased (fall in T1 by about 25%). In L-NAME-treated mice Ach-induced vasodilatation in BCA was lost. In isolated, perfused artery from ApoE/LDLR(-/-) mice endothelial permeability was increased. MRI-based assessment of endothelium-dependent vasodilatation induced by Ach and endothelial permeability using a retrospectively self-gated 3D gradient-echo sequence (IntraGate® FLASH) enables the reliable detection of systemic endothelial dysfunction in mice and provides an important tool for the experimental pharmacology of the endothelium in murine models of diseases in vivo. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Anna Bar
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Kraków, Poland
- Chair of Pharmacology, Jagiellonian University Medical College, Kraków, Poland
| | - Tomasz Skórka
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
| | - Krzysztof Jasiński
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
| | - Magdalena Sternak
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Kraków, Poland
| | - Żaneta Bartel
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
| | - Urszula Tyrankiewicz
- Department of Magnetic Resonance Imaging, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
| | - Stefan Chlopicki
- Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Kraków, Poland
- Chair of Pharmacology, Jagiellonian University Medical College, Kraków, Poland
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Huang C, Su Y, Zhang H, Qian LX, Luo J. Comparison of Different Pulse Waveforms for Local Pulse Wave Velocity Measurement in Healthy and Hypertensive Common Carotid Arteries in Vivo. ULTRASOUND IN MEDICINE & BIOLOGY 2016; 42:1111-1123. [PMID: 26924694 DOI: 10.1016/j.ultrasmedbio.2015.12.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Revised: 12/12/2015] [Accepted: 12/28/2015] [Indexed: 06/05/2023]
Abstract
Pulse wave velocity (PWV), a measurement of arterial stiffness, can be estimated locally by determining the time delay of the pulse waveforms for a known distance as measured in an ultrasound image. Our aim was to compare three ultrasound-based methods for estimation of local PWV based on the measurement of diameter distension waveforms, displacement waveforms of the anterior wall and displacement waveforms of the posterior wall, respectively, in human common carotid arteries in vivo. The local PWVs at both systolic foot (PWVsf) and dicrotic notch (PWVdn) were estimated from ultrasound radiofrequency data of 25 healthy and 24 hypertensive patients for each method. PWV estimation using the distension waveform method was found to have the highest precision in both groups. Both PWVsf and PWVdn were significantly higher in the hypertensive group compared with the healthy group using the distension waveform method (PWVsf: 6.08 ± 1.70 m/s vs. 4.75 ± 0.92 m/s, p = 0.000014; PWVdn: 7.83 ± 2.26 m/s vs. 5.21 ± 0.95 m/s, p < 0.000001), whereas there was no significant difference at a significance level of 0.01 between the two groups when the anterior or posterior wall waveform method was used. Thus, the difference in arterial stiffness between the two groups could be discriminated well by the distension waveform method. The local PWV estimated using distension waveforms might be a promising index for arterial stiffness characterization and hypertension management.
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Affiliation(s)
- Chengwu Huang
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China; Center for Biomedical Imaging Research, Tsinghua University, Beijing, China
| | - Yuan Su
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Hong Zhang
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Lin-Xue Qian
- Department of Ultrasound, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Jianwen Luo
- Department of Biomedical Engineering, School of Medicine, Tsinghua University, Beijing, China; Center for Biomedical Imaging Research, Tsinghua University, Beijing, China.
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Previtera ML, Sengupta A. Substrate Stiffness Regulates Proinflammatory Mediator Production through TLR4 Activity in Macrophages. PLoS One 2015; 10:e0145813. [PMID: 26710072 PMCID: PMC4692401 DOI: 10.1371/journal.pone.0145813] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 12/09/2015] [Indexed: 01/06/2023] Open
Abstract
Clinical data show that disease adversely affects tissue elasticity or stiffness. While macrophage activity plays a critical role in driving disease pathology, there are limited data available on the effects of tissue stiffness on macrophage activity. In this study, the effects of substrate stiffness on inflammatory mediator production by macrophages were investigated. Bone marrow-derived macrophages were grown on polyacrylamide gels that mimicked the stiffness of a variety of soft biological tissues. Overall, macrophages grown on soft substrates produced less proinflammatory mediators than macrophages grown on stiff substrates when the endotoxin LPS was added to media. In addition, the pathways involved in stiffness-regulated proinflammation were investigated. The TLR4 signaling pathway was examined by evaluating TLR4, p-NF-κB p65, MyD88, and p-IκBα expression as well as p-NF-κB p65 translocation. Expression and translocation of the various signaling molecules were higher in macrophages grown on stiff substrates than on soft substrates. Furthermore, TLR4 knockout experiments showed that TLR4 activity enhanced proinflammation on stiff substrates. In conclusion, these results suggest that proinflammatory mediator production initiated by TLR4 is mechanically regulated in macrophages.
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Affiliation(s)
- Michelle L. Previtera
- JFK Neuroscience Institute, JFK Medical Center, 65 James Street, Edison, New Jersey, 08820, United States of America
- Department of Neuroscience, Seton Hall University, 400 South Orange Avenue, South Orange, New Jersey, 07079, United States of America
| | - Amitabha Sengupta
- JFK Neuroscience Institute, JFK Medical Center, 65 James Street, Edison, New Jersey, 08820, United States of America
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Effect of Diet and Age on Arterial Stiffening Due to Atherosclerosis in ApoE(-/-) Mice. Ann Biomed Eng 2015; 44:2202-17. [PMID: 26502169 DOI: 10.1007/s10439-015-1486-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 10/13/2015] [Indexed: 01/20/2023]
Abstract
This work analyzes the progressive stiffening of the aorta due to atherosclerosis development of both ApoE(-/-) and C57BL/6J mice fed on a Western (n = 5) and a normal (n = 5) chow diet for the ApoE(-/-) group and on a normal chow diet (n = 5) for the C57BL/6J group. Sets of 5 animals from the three groups were killed after 10, 20, 30 and 40 weeks on their respective diets (corresponding to 17, 27, 37 and 47 weeks of age). Mechanical properties (inflation test and axial residual stress measurements) and histological properties were compared for both strains, ApoE(-/-) on the hyper-lipidic diet and both ApoE(-/-) and C57BL/6J on the normal diet, after the same period and after different periods of diet. The results indicated that the aorta stiffness in the ApoE(-/-) and C57BL/6J mice under normal diet remained approximately constant irrespective of their age. However, the arterial stiffness in the ApoE(-/-) on the hyper-lipidic diet increased over time. Statistical differences were found between the group after 10 weeks and the groups after 30 and 40 weeks of a hyper-lipidic diet. Comparing the hyper-lipidic and normal diet mice, statistical differences were also found between both diets in all cases after 40 weeks of diet, frequently after 30 weeks, and in some cases after 20 weeks. The early stages of lesion corresponded to the first 2 weeks of diet. Advanced lesions were found at 30 weeks and, finally, the aorta was completely damaged after 40 weeks of diet. In conclusion, we found substantial changes in the mechanical properties of the aorta walls of the ApoE(-/-) mice fed with the hyper-lipidic diet compared to the normal chow diet groups for both the ApoE(-/-) and C57BL/6J groups. These findings could serve as a reference for the study of changes in the arterial wall properties in cases of atherosclerosis.
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Zhang N, Chen J, Yin M, Glaser KJ, Xu L, Ehman RL. Quantification of regional aortic stiffness using MR elastography: A phantom and ex-vivo porcine aorta study. Magn Reson Imaging 2015; 34:91-6. [PMID: 26597836 DOI: 10.1016/j.mri.2015.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 09/19/2015] [Accepted: 10/18/2015] [Indexed: 02/06/2023]
Abstract
MR Elastography (MRE) is a noninvasive technique for measuring tissue stiffness that has been used to assess the average stiffness of the abdominal aorta. The utility of aortic MRE would be improved if it could provide information about local variations in aortic stiffness. We hypothesize that regional variations in aortic stiffness can also be measured with MRE and the purpose of this work was to demonstrate that MRE can measure regional stiffness variations in a vascular phantom and in ex vivo porcine aortas. A vascular phantom was fabricated, containing two silicone tubes embedded in gel. A segment of one of the tubes was modified to increase its stiffness. MRE was performed on the phantom with a continuous flow of water through the tubes. The stiffness distribution along the modified tube was measured and compared to the reference tube. MRE was also performed in porcine aortas embedded in gel with segments treated with saline or formalin for 4 days. The stiffness difference between saline- and formalin-treated aortic segments was measured by MRE and mechanical tests. A positive correlation was found between the regional stiffnesses measured by MRE and mechanical tests. The results indicate that MRE can be used to evaluate the local stiffness distribution in silicone tubes and ex vivo porcine aortas. It may therefore be possible to apply MRE to measure regional stiffness variations of the aorta in vivo.
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Affiliation(s)
- Nan Zhang
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester 55905, MN, USA; Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Chaoyang District Anzhen Road 2nd, Beijing 100029, China
| | - Jun Chen
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester 55905, MN, USA.
| | - Meng Yin
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester 55905, MN, USA
| | - Kevin J Glaser
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester 55905, MN, USA
| | - Lei Xu
- Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, Chaoyang District Anzhen Road 2nd, Beijing 100029, China.
| | - Richard L Ehman
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester 55905, MN, USA
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Bakermans AJ, Abdurrachim D, Moonen RPM, Motaal AG, Prompers JJ, Strijkers GJ, Vandoorne K, Nicolay K. Small animal cardiovascular MR imaging and spectroscopy. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2015; 88-89:1-47. [PMID: 26282195 DOI: 10.1016/j.pnmrs.2015.03.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 03/09/2015] [Accepted: 03/09/2015] [Indexed: 06/04/2023]
Abstract
The use of MR imaging and spectroscopy for studying cardiovascular disease processes in small animals has increased tremendously over the past decade. This is the result of the remarkable advances in MR technologies and the increased availability of genetically modified mice. MR techniques provide a window on the entire timeline of cardiovascular disease development, ranging from subtle early changes in myocardial metabolism that often mark disease onset to severe myocardial dysfunction associated with end-stage heart failure. MR imaging and spectroscopy techniques play an important role in basic cardiovascular research and in cardiovascular disease diagnosis and therapy follow-up. This is due to the broad range of functional, structural and metabolic parameters that can be quantified by MR under in vivo conditions non-invasively. This review describes the spectrum of MR techniques that are employed in small animal cardiovascular disease research and how the technological challenges resulting from the small dimensions of heart and blood vessels as well as high heart and respiratory rates, particularly in mice, are tackled.
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Affiliation(s)
- Adrianus J Bakermans
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands; Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Desiree Abdurrachim
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Rik P M Moonen
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Abdallah G Motaal
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands; Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Jeanine J Prompers
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Gustav J Strijkers
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands; Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Katrien Vandoorne
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands
| | - Klaas Nicolay
- Biomedical NMR, Department of Biomedical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands.
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Tat J, Au JS, Keir PJ, MacDonald MJ. Reduced common carotid artery longitudinal wall motion and intramural shear strain in individuals with elevated cardiovascular disease risk using speckle tracking. Clin Physiol Funct Imaging 2015; 37:106-116. [PMID: 26183827 DOI: 10.1111/cpf.12270] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 05/21/2015] [Indexed: 11/26/2022]
Abstract
Longitudinal motion of the intima-media and adventitia layers of the common carotid artery (CCA) wall were assessed with ultrasound speckle tracking in seven individuals with spinal cord injury (SCI), who are considered at increased risk of cardiovascular disease, and in seven able-bodied participants. CCA longitudinal wall displacement and intramural shear strain were compared to traditional markers of arterial health, including CCA stiffness and intima-media thickness (IMT). For each cardiac cycle, longitudinal CCA wall motion was characterized by bidirectional movement patterns containing motion retrograde to blood flow during systole, followed by antegrade motion during diastole. Relative displacement of the intima-media versus the adventitia was used to calculate longitudinal intramural shear strain and provided insight to local arterial wall properties. The retrograde intramural shear strain was smaller in individuals with SCI by 60·2% (P<0·05) compared to able-bodied participants, showing smaller peak displacements in both the intima-media (P<0·05) and adventitia (P<0·05). In the antegrade direction, there were no group differences in either longitudinal displacements or shear strain. The group differences observed in the retrograde wall motion phase were greater than those observed for CCA stiffness or IMT and were found to be independent of both indices, indicating indices of the retrograde phase intramural shear strain may be a novel and sensitive marker of vascular health. Our findings demonstrate that assessment of longitudinal arterial wall shear strain may provide valuable insight into vascular structure and function and may hold potential for the early detection of cardiovascular disease.
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Affiliation(s)
- Jimmy Tat
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - Jason S Au
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
| | - Peter J Keir
- Department of Kinesiology, McMaster University, Hamilton, ON, Canada
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Morgan JT, Raghunathan VK, Chang YR, Murphy CJ, Russell P. The intrinsic stiffness of human trabecular meshwork cells increases with senescence. Oncotarget 2015; 6:15362-74. [PMID: 25915531 PMCID: PMC4558157 DOI: 10.18632/oncotarget.3798] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Accepted: 03/20/2015] [Indexed: 12/26/2022] Open
Abstract
Dysfunction of the human trabecular meshwork (HTM) plays a central role in the age-associated disease glaucoma, a leading cause of irreversible blindness. The etiology remains poorly understood but cellular senescence, increased stiffness of the tissue, and the expression of Wnt antagonists such as secreted frizzled related protein-1 (SFRP1) have been implicated. However, it is not known if senescence is causally linked to either stiffness or SFRP1 expression. In this study, we utilized in vitro HTM senescence to determine the effect on cellular stiffening and SFRP1 expression. Stiffness of cultured cells was measured using atomic force microscopy and the morphology of the cytoskeleton was determined using immunofluorescent analysis. SFRP1 expression was measured using qPCR and immunofluorescent analysis. Senescent cell stiffness increased 1.88±0.14 or 2.57±0.14 fold in the presence or absence of serum, respectively. This was accompanied by increased vimentin expression, stress fiber formation, and SFRP1 expression. In aggregate, these data demonstrate that senescence may be a causal factor in HTM stiffening and elevated SFRP1 expression, and contribute towards disease progression. These findings provide insight into the etiology of glaucoma and, more broadly, suggest a causal link between senescence and altered tissue biomechanics in aging-associated diseases.
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Affiliation(s)
- Joshua T. Morgan
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Vijay Krishna Raghunathan
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Yow-Ren Chang
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
| | - Christopher J. Murphy
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
- Department of Ophthalmology &; Vision Science, School of Medicine, University of California, Davis, CA, USA
| | - Paul Russell
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA, USA
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Bar A, Skorka T, Jasinski K, Chlopicki S. MRI-based assessment of endothelial function in mice in vivo. Pharmacol Rep 2015; 67:765-70. [PMID: 26321279 DOI: 10.1016/j.pharep.2015.05.007] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Revised: 05/08/2015] [Accepted: 05/13/2015] [Indexed: 12/28/2022]
Abstract
While a healthy endothelium serves to maintain vascular haemostasis, a malfunctioning endothelium leads to various cardiovascular diseases, including atherothrombosis. Endothelial dysfunction is characterized by increased vascular permeability, impaired endothelium-dependent responses and various pro-inflammatory and pro-thrombotic changes in endothelial phenotype, all of which could provide the basis for an in vivo diagnosis of endothelial dysfunction. In the present review, we briefly summarize the magnetic resonance imaging (MRI)-based methods available for assessing endothelial function in animal models, especially in mice. These methods are aimed to assess biochemical phenotype using molecular imaging, endothelium-dependent responses or changes in endothelial permeability. All these approaches provide a complementary insight into the endothelial dysfunction in vivo and may offer a unique opportunity to study endothelium-based mechanisms of diseases and endothelial response to treatment.
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Affiliation(s)
- Anna Bar
- Department of MRI, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland; Department of Experimental Pharmacology, Jagiellonian University Medical College, Kraków, Poland
| | - Tomasz Skorka
- Department of MRI, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland.
| | - Krzysztof Jasinski
- Department of MRI, Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, Poland
| | - Stefan Chlopicki
- Department of Experimental Pharmacology, Jagiellonian University Medical College, Kraków, Poland; Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Kraków, Poland
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Wolkow PP, Kosiniak-Kamysz W, Osmenda G, Wilk G, Bujak-Gizycka B, Ignacak A, Kanitkar M, Walus-Miarka M, Harrison DG, Korbut R, Malecki MT, Guzik TJ. GTP cyclohydrolase I gene polymorphisms are associated with endothelial dysfunction and oxidative stress in patients with type 2 diabetes mellitus. PLoS One 2014; 9:e108587. [PMID: 25369080 PMCID: PMC4219671 DOI: 10.1371/journal.pone.0108587] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Accepted: 08/22/2014] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND The genetic background of atherosclerosis in type 2 diabetes mellitus (T2DM) is complex and poorly understood. Studying genetic components of intermediate phenotypes, such as endothelial dysfunction and oxidative stress, may aid in identifying novel genetic components for atherosclerosis in diabetic patients. METHODS Five polymorphisms forming two haplotype blocks within the GTP cyclohydrolase 1 gene, encoding a rate limiting enzyme in tetrahydrobiopterin synthesis, were studied in the context of flow and nitroglycerin mediated dilation (FMD and NMD), intima-media thickness (IMT), and plasma concentrations of von Willebrand factor (vWF) and malondialdehyde (MDA). RESULTS Rs841 was associated with FMD (p = 0.01), while polymorphisms Rs10483639, Rs841, Rs3783641 (which form a single haplotype) were associated with both MDA (p = 0.012, p = 0.0015 and p = 0.003, respectively) and vWF concentrations (p = 0.016, p = 0.03 and p = 0.045, respectively). In addition, polymorphism Rs8007267 was also associated with MDA (p = 0.006). Haplotype analysis confirmed the association of both haplotypes with studied variables. CONCLUSIONS Genetic variation of the GCH1 gene is associated with endothelial dysfunction and oxidative stress in T2DM patients.
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Affiliation(s)
- Pawel P. Wolkow
- Centre for Medical Genomics OMICRON, Jagiellonian University Medical College, Krakow, Poland
- Department of Pharmacology, Jagiellonian University Medical College, Krakow, Poland
| | - Wladyslaw Kosiniak-Kamysz
- Department of Internal and Agricultural Medicine, Jagiellonian University Medical College, Krakow, Poland
| | - Grzegorz Osmenda
- Department of Internal and Agricultural Medicine, Jagiellonian University Medical College, Krakow, Poland
| | - Grzegorz Wilk
- Department of Internal and Agricultural Medicine, Jagiellonian University Medical College, Krakow, Poland
| | - Beata Bujak-Gizycka
- Centre for Medical Genomics OMICRON, Jagiellonian University Medical College, Krakow, Poland
- Department of Pharmacology, Jagiellonian University Medical College, Krakow, Poland
| | - Adam Ignacak
- Department of Internal and Agricultural Medicine, Jagiellonian University Medical College, Krakow, Poland
| | - Mihir Kanitkar
- Department of Clinical Pharmacology, Vanderbilt University, Nashville, TN, United States of America
| | | | - David G. Harrison
- Department of Clinical Pharmacology, Vanderbilt University, Nashville, TN, United States of America
| | - Ryszard Korbut
- Department of Pharmacology, Jagiellonian University Medical College, Krakow, Poland
| | - Maciej T. Malecki
- Department of Metabolic Diseases, Jagiellonian University Medical College, Krakow, Poland
- University Hospital, Krakow, Poland
| | - Tomasz J. Guzik
- Department of Internal and Agricultural Medicine, Jagiellonian University Medical College, Krakow, Poland
- Institute of Cardiovascular and Medical Sciences, University of Glasgow, Glasgow, United Kingdom
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Resveratrol prevents high fat/sucrose diet-induced central arterial wall inflammation and stiffening in nonhuman primates. Cell Metab 2014; 20:183-90. [PMID: 24882067 PMCID: PMC4254394 DOI: 10.1016/j.cmet.2014.04.018] [Citation(s) in RCA: 158] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Revised: 01/21/2014] [Accepted: 04/17/2014] [Indexed: 02/01/2023]
Abstract
Central arterial wall stiffening, driven by a chronic inflammatory milieu, accompanies arterial diseases, the leading cause of cardiovascular (CV) morbidity and mortality in Western society. An increase in central arterial wall stiffening, measured as an increase in aortic pulse wave velocity (PWV), is a major risk factor for clinical CV disease events. However, no specific therapies to reduce PWV are presently available. In rhesus monkeys, a 2 year diet high in fat and sucrose (HFS) increases not only body weight and cholesterol, but also induces prominent central arterial wall stiffening and increases PWV and inflammation. The observed loss of endothelial cell integrity, lipid and macrophage infiltration, and calcification of the arterial wall were driven by genomic and proteomic signatures of oxidative stress and inflammation. Resveratrol prevented the HFS-induced arterial wall inflammation and the accompanying increase in PWV. Dietary resveratrol may hold promise as a therapy to ameliorate increases in PWV.
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