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Mironov AA, Beznoussenko GV. Opinion: On the Way towards the New Paradigm of Atherosclerosis. Int J Mol Sci 2022; 23:ijms23042152. [PMID: 35216269 PMCID: PMC8879789 DOI: 10.3390/ijms23042152] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2021] [Revised: 02/11/2022] [Accepted: 02/11/2022] [Indexed: 02/07/2023] Open
Abstract
Atherosclerosis is a multicausal disease characterized by the formation of cholesterol-containing plaque in the pronounced intima nearest to the heart's elastic-type arteries that have high levels of blood circulation. Plaques are formed due to arterial pressure-induced damage to the endothelium in areas of turbulent blood flow. It is found in the majority of the Western population, including young people. This denies the monogenic mechanism of atherogenesis. In 1988, Orekhov et al. and Kawai et al. discovered that the presence of atherogenic (modified, including oxidized ones) LDLs is necessary for atherogenesis. On the basis of our discovery, suggesting that the overloading of enterocytes with lipids could lead to the formation of modified LDLs, we proposed a new hypothesis explaining the main factors of atherogenesis. Indeed, when endothelial cells are damaged and then pass through the G2 phase of their cell cycle they secrete proteins into their basement membrane. This leads to thickening of the basement membrane and increases its affinity to LDL especially for modified ones. When the enterocyte transcytosis pathway is overloaded with fat, very large chylomicrons are formed, which have few sialic acids, circulate in the blood for a long time, undergo oxidation, and can induce the production of autoantibodies. It is the sialic acids that shield the short forks of the polysaccharide chains to which autoantibodies are produced. Here, these data are evaluated from the point of view of our new model.
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Cellular Model of Atherogenesis Based on Pluripotent Vascular Wall Pericytes. Stem Cells Int 2016; 2016:7321404. [PMID: 26880986 PMCID: PMC4736424 DOI: 10.1155/2016/7321404] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2015] [Accepted: 12/09/2015] [Indexed: 12/27/2022] Open
Abstract
Pericytes are pluripotent cells that can be found in the vascular wall of both microvessels and large arteries and veins. They have distinct morphology with long branching processes and form numerous contacts with each other and with endothelial cells, organizing the vascular wall cells into a three-dimensional network. Accumulating evidence demonstrates that pericytes may play a key role in the pathogenesis of vascular disorders, including atherosclerosis. Macrovascular pericytes are able to accumulate lipids and contribute to growth and vascularization of the atherosclerotic plaque. Moreover, they participate in the local inflammatory process and thrombosis, which can lead to fatal consequences. At the same time, pericytes can represent a useful model for studying the atherosclerotic process and for the development of novel therapeutic approaches. In particular, they are suitable for testing various substances' potential for decreasing lipid accumulation induced by the incubation of cells with atherogenic low-density lipoprotein. In this review we will discuss the application of cellular models for studying atherosclerosis and provide several examples of successful application of these models to drug research.
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Cellular mechanisms of human atherosclerosis: Role of cell-to-cell communications in subendothelial cell functions. Tissue Cell 2015; 48:25-34. [PMID: 26747411 DOI: 10.1016/j.tice.2015.11.002] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Revised: 11/09/2015] [Accepted: 11/09/2015] [Indexed: 12/16/2022]
Abstract
The present study was undertaken in order to extend of our earlier work, focusing on the analysis of roles of cell-to-cell communications in the regulation of the subendothelial cell function. In present study, we have found that the expression of connexin43 (Cx43) is dramatically reduced in human atherosclerotic lesions, compared with undiseased intima. In atherosclerotic lesions, the number of so-called 'connexin plaques' was found to be lower in lipid-laden cells than in cells which were free from lipid inclusions. In primary cell culture, subendothelial intimal cells tended to create multicellular structures in the form of clusters. Cluster creation was accompanied by the formation of gap junctions between cells; the degree of gap junctional communication correlated with the density of cells in culture. We found that atherosclerosis-related processes such as DNA synthesis, protein synthesis and accumulation of intracellular cholesterol correlated with the degree of cell-to-cell communication. The relation of DNA and protein synthesis with cell-to-cell communication could be described as "bell-shaped". We further incubated cells, cultured from undiseased subendothelial intima, with various forms of modified LDL causing intracellular cholesterol accumulation. After the incubation of intimal cells with modified LDL, intercellular communication has "dropped" considerably. The findings indicate that intracellular lipid accumulation might be a reason for a decrease of the number of gap junctions. The findings also suggest that the disintegration of cellular network is associated with foam cell formation, the process known as a key event of atherogenesis.
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Ivanova EA, Bobryshev YV, Orekhov AN. Intimal pericytes as the second line of immune defence in atherosclerosis. World J Cardiol 2015; 7:583-93. [PMID: 26516412 PMCID: PMC4620069 DOI: 10.4330/wjc.v7.i10.583] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 08/31/2015] [Accepted: 09/07/2015] [Indexed: 02/06/2023] Open
Abstract
Inflammation plays an essential role in the development of atherosclerosis. The initiation and growth of atherosclerotic plaques is accompanied by recruitment of inflammatory and precursor cells from the bloodstream and their differentiation towards pro-inflammatory phenotypes. This process is orchestrated by the production of a number of pro-inflammatory cytokines and chemokines. Human arterial intima consists of structurally distinct leaflets, with a proteoglycan-rich layer lying immediately below the endothelial lining. Recent studies reveal the important role of stellate pericyte-like cells (intimal pericytes) populating the proteoglycan-rich layer in the development of atherosclerosis. During the pathologic process, intimal pericytes may participate in the recruitment of inflammatory cells by producing signalling molecules and play a role in the antigen presentation. Intimal pericytes are also involved in lipid accumulation and the formation of foam cells. This review focuses on the role of pericyte-like cells in the development of atherosclerotic lesions.
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Affiliation(s)
- Ekaterina A Ivanova
- Ekaterina A Ivanova, Department of Development and Regeneration, Biomedical Sciences Group, KU Leuve, Leuven, Belgium
| | - Yuri V Bobryshev
- Ekaterina A Ivanova, Department of Development and Regeneration, Biomedical Sciences Group, KU Leuve, Leuven, Belgium
| | - Alexander N Orekhov
- Ekaterina A Ivanova, Department of Development and Regeneration, Biomedical Sciences Group, KU Leuve, Leuven, Belgium
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Orekhov AN, Bobryshev YV, Chistiakov DA. The complexity of cell composition of the intima of large arteries: focus on pericyte-like cells. Cardiovasc Res 2014; 103:438-51. [PMID: 25016615 DOI: 10.1093/cvr/cvu168] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Pericytes, which are also known as Rouget cells or perivascular cells, are considered to represent a likely distinct pool of vascular cells that are extremely branched and located mostly in the periphery of the vascular system. The family of pericytes is a heterogeneous cell population that includes pericytes and pericyte-like cells. Accumulated data indicate that networks of pericyte-like cells exist in normal non-atherosclerotic intima, and that pericyte-like cells can be involved in the development of atherosclerotic lesions from the very early stages of disease. The pathogenic role of arterial pericytes and pericyte-like cells also might be important in advanced and complicated atherosclerotic lesions via realizing mechanisms of vascular remodelling, ectopic ossification, intraplaque neovascularization, and probably thrombosis.
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Affiliation(s)
- Alexander N Orekhov
- Institute for Atherosclerosis Research, Skolkovo Innovative Center, Moscow, Russia
| | - Yuri V Bobryshev
- Institute for Atherosclerosis Research, Skolkovo Innovative Center, Moscow, Russia Faculty of Medicine, School of Medical Sciences, University of New South Wales, Kensington, Sydney, NSW 2052, Australia
| | - Dimitry A Chistiakov
- Department of Medical Nanobiotechnology, Pirogov Russian State Medical University, Moscow, Russia
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6
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Orekhov AN, Tertov VV, Pivovarova EM. The effects of antihypertensive agents on atherosclerosis-related parameters of human aorta intimal cells. Cardiology 2000; 89:111-8. [PMID: 9524011 DOI: 10.1159/000006765] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Four antihypertensive agents - amlodipine, verapamil, propranolol and perindoprilat - were studied in human cell cultures. Antiatherogenic activity was investigated using uninvolved human aortic smooth muscle intima cells and atherogenic serum obtained from patients with coronary atherosclerosis. Amlodipine and verapamil significantly inhibited serum-induced increases in cholesterol content, cell-proliferative activity and protein synthesis in the cultured cells. Propranolol increased all three parameters, while perindoprilat had no effects. In addition, amlodipine and verapamil significantly lowered the intracellular cholesterol content of smooth muscle cells derived from atherosclerotic plaque and inhibited cell proliferation and protein synthesis. Propranolol increased all of these parameters, while perindoprilat produced no effects. The antiatherogenic and antiatherosclerotic actions of verapamil and amlodipine were confirmed in an ex vivo model. These studies demonstrated a beneficial antiatherosclerotic effect of amlodipine that was greater than that of verapamil. Perindoprilat had a neutral effect on atherosclerotic parameters, while the action of propranolol appeared to be potentially detrimental.
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Affiliation(s)
- A N Orekhov
- Institute of Experimental Cardiology, Cardiology Research Center, Moscow, Russia
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Rolfe BE, Muddiman JD, Smith NJ, Campbell GR, Campbell JH. ICAM-1 expression by vascular smooth muscle cells is phenotype-dependent. Atherosclerosis 2000; 149:99-110. [PMID: 10704620 DOI: 10.1016/s0021-9150(99)00322-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Atherosclerosis is an inflammatory disease characterised by increased expression of adhesion molecules for leukocytes on both the surface of dysfunctional endothelium and on smooth muscle cells (SMC) within the lesion. It is also characterised by altered SMC phenotypic expression, indicated by a decreased volume fraction of myofilaments (V(v)myo) [1,2] and changes in gene expression [3]. The present study used an in vitro model to investigate, by immunofluorescence staining and flow cytometry, the influence of phenotype on vascular SMC expression of the adhesion molecule for leukocytes, intracellular adhesion molecule-1 (ICAM-1), and the regulatory mechanisms involved in this process. Smooth muscle cells with a high V(v)myo, freshly isolated from rat aortic media, expressed little or no ICAM-1 and this could not be induced by interleukin-1beta (IL-1beta). As SMC modulated phenotype, indicated by decreasing V(v)myo over the first 5 days of culture, there was a concomitant increase in ICAM-1 expression. At day 9 of primary culture, when SMC cultures had returned to the high V(v)myo phenotype, ICAM-1 expression was markedly lower. However, these cells retained the capacity to express ICAM-1 in response to IL-1beta. After several passages in culture, cells (with a low V(v)myo) constitutively expressed ICAM-1, with levels further up-regulated in response to IL-1beta. These changes in ICAM-1 expression were not related to proliferative state, since similar results were obtained with growth arrested SMC. Investigation of signalling pathways involved in regulating ICAM-1 expression by primary vascular SMC suggested a complex regulatory mechanism. Activation of adenyl cyclase (with forskolin) caused a significant increase in cells expressing ICAM-1. Treatment with inhibitors of protein kinase C (chelerythrine chloride), protein tyrosine kinase (genistein), or the transcription factor NF-kappaB (PDTC) had no significant effect on IL-1-induced ICAM-1 expression. However, in the presence of serum, both genistein and PDTC caused a significant increase in basal expression. The results indicate that ICAM-1 expression by SMC is phenotype-dependent, with expression evident only after cells have modulated to a low V(v)myo phenotype. They also indicate the existence of complex regulatory mechanisms, possibly involving the SMC cytoskeleton.
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Affiliation(s)
- B E Rolfe
- Department of Anatomical Sciences, Centre for Research in Vascular Biology, University of Queensland, Brisbane, Australia.
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Andreeva ER, Pugach IM, Orekhov AN. Subendothelial smooth muscle cells of human aorta express macrophage antigen in situ and in vitro. Atherosclerosis 1997; 135:19-27. [PMID: 9395269 DOI: 10.1016/s0021-9150(97)00136-6] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Cells bearing a smooth muscle cell marker--alpha-actin and a macrophage marker--CD68 antigen were immunocytochemically identified on 'en face' preparations of human aortic intima. Cells, expressing smooth muscle alpha-actin, macrophage CD68 antigen and both markers, i.e. smooth muscle cells possessing the macrophage antigen, were identified both in grossly normal aortic areas and in atherosclerotic lesions (fatty streaks and atherosclerotic plaques). CD68-positive smooth muscle cells were most common in the lipid-rich areas: fatty streaks and atherosclerotic plaque shoulders. Cells expressing smooth muscle alpha-actin and CD68 were also revealed in primary cultures prepared from grossly normal and atherosclerotic intima. Cells expressing both antigens were found in all examined cultures. The proportion of these cells in cultures from grossly normal areas and atherosclerotic plaques was similar: 14.5 +/- 4.1 and 14.6 +/- 4.8%, respectively. Cultures from fatty streaks had a higher content of cells expressing both antigens: 25.1 +/- 7.0%. Modified low density lipoprotein-induced intracellular lipid accumulation in cells cultured from grossly normal intima led to a three-fold increase in the number of cells sharing alpha-actin and CD68 antigen. Accumulation of latex beads by phagocytosis had a similar effect. It was suggested that in atherosclerotic lesions intracellular lipid accumulation and other stimulators of phagocytosis may provoke the expression of macrophage-associated antigen CD68 in settled cells of the subendothelial intima of human aorta.
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MESH Headings
- Adult
- Antigens, CD/biosynthesis
- Antigens, Differentiation, Myelomonocytic/biosynthesis
- Aorta/cytology
- Aorta/immunology
- Aorta/metabolism
- Brain/cytology
- Brain/immunology
- Brain/metabolism
- Cells, Cultured
- Fibroblasts/immunology
- Fibroblasts/metabolism
- Humans
- Intracellular Fluid/immunology
- Intracellular Fluid/metabolism
- Macrophages/immunology
- Macrophages/metabolism
- Male
- Middle Aged
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/immunology
- Muscle, Smooth, Vascular/metabolism
- Phagocytosis
- Skin/immunology
- Skin/metabolism
- Tunica Intima/cytology
- Tunica Intima/metabolism
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Affiliation(s)
- E R Andreeva
- Institute of Experimental Cardiology, Cardiology Research Center, Moscow, Russia
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9
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Orekhov AN, Tertov VV. In vitro effect of garlic powder extract on lipid content in normal and atherosclerotic human aortic cells. Lipids 1997; 32:1055-60. [PMID: 9358431 DOI: 10.1007/s11745-997-0136-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
In the present study, the mechanism of the in vitro effect of garlic powder extract (GPE) on lipid content of cultured human aortic cells was investigated. The addition of GPE abolished atherogenic blood serum-induced accumulation of free cholesterol, triglycerides, and cholesteryl esters in smooth muscle cells derived from uninvolved (normal) intima. In cells isolated from atherosclerotic plaque, GPE lowered these lipids. GPE inhibited lipid synthesis both in normal and atherosclerotic cells. It inhibited acyl-CoA:cholesterol acyltransferase activity that participates in the cholesteryl ester formation and stimulated cholesteryl ester hydrolase that degrades cholesteryl esters. This may explain the lipid reduction caused by GPE in atherosclerotic cells. GPE inhibited the uptake of modified low density lipoprotein and degradation of lipoprotein-derived cholesteryl esters, thus considerably reducing the intracellular accumulation of cholesteryl esters. This suggests the mechanism responsible for the prevention of lipid accumulation in aortic cells caused by atherogenic blood serum.
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Affiliation(s)
- A N Orekhov
- Institute of Experimental Cardiology, Russian Academy of Medical Sciences, Moscow, Russia
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10
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Affiliation(s)
- H S Kruth
- Section of Experimental Atherosclerosis, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
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11
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Bobryshev YV, Lord RS. Langhans cells of human arterial intima: uniform by stellate appearance but different by nature. Tissue Cell 1996; 28:177-94. [PMID: 8650671 DOI: 10.1016/s0040-8166(96)80006-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The stellate cells in human arterial intima known as Langhans cells were investigated. Arterial specimens were obtained during carotid endarterectomy and aortic reconstruction and included atherosclerotic lesions as well as areas of the adjacent normal appearing arterial wall. Following immunohistochemical and electron microscopic analysis, most of the stellate cells were found to inhabit the elastic-hyperplastic layer of the intima in the normal arterial wall but in atherosclerotic lesions, stellate cells were distributed throughout all intimal layers. Immunohistochemical examination revealed that different types of intimal cells, including smooth muscle cells (HHF-35; smooth muscle alpha-actin +) and vascular dendritic cells (CD1a+, S-100+), exhibited a typical stellate appearance but the cell processes of macrophages (HAM56+, CD68+) were too short for macrophages to be considered as stellate. No other intimal cells formed processes which could be detected under immunohistochemical examination. In atherosclerotic lesions, some smooth muscle cells transforming to foam cells retained their stellate shape. Smooth muscle cells interacted with each other through gap junctions while other intimal cells including vascular dendritic cells contacted each other without forming any specialized structures. We conclude that Langhans cells comprise two histological types of intimal cells, namely, smooth muscle cells and vascular dendritic cells.
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Affiliation(s)
- Y V Bobryshev
- Surgical Professorial Unit, St. Vincent's Hospital, University of New South Wales, Sydney, Darlinghurst, Australia
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12
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Andreeva ER, Serebryakov VN, Orekhov AN. Gap junctional communication in primary culture of cells derived from human aortic intima. Tissue Cell 1995; 27:591-7. [PMID: 7491628 DOI: 10.1016/s0040-8166(05)80069-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Intercellular communication via gap junctions plays an important role in the regulation and homeostasis. The presence of gap junctions and the efficiency of their function directly correlates with the degree of cell differentiation in a tissue. In the present study, gap junctional communication has been investigated in a primary culture of highly differentiated mesenchymal cells (subendothelial smooth muscle cells isolated from grossly normal and atherosclerotic areas of human aorta) and in poorly differentiated cells of mesenchymal origin (adult human skin fibroblasts as well as skin fibroblasts and aortic smooth muscle cells, derived from human fetus). The fluorescent dye transfer technique was used in this study. In cell cultures isolated from grossly normal and atherosclerotic aorta, the number of cells coupled via gap junctions increased with cell density and reached a plateau at a cell density of 50 to 70 cells/mm2. In cultures of normal aortic cells the number of coupled cells was 23.0 +/- 4.1 per injected cell and was significantly higher than in cultures of atherosclerotic cells (16.4 +/- 2.1, p < 0.05). Gap junctional communication between cells loaded with lipid inclusions was 2.4-fold lower than between cells free of excess intracellular lipids. In cultures of human skin fibroblasts the rate of intercellular communication was lower than in cultures of normal aortic cells and was comparable to that in cultures of atherosclerotic cells. There was practically no cell-to-cell communication in cultures of fetal cells. It is hypothesized that the reduced gap junctional communication in atherosclerotic human aorta is associated with the alterations in the degree of smooth muscle cell differentiation and impairs the function of the intima in atherosclerosis.
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Affiliation(s)
- E R Andreeva
- Institute of Experimental Cardiology, Cardiology Research Center, Moscow, Russia
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13
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Mukhin DN, Chao FF, Kruth HS. Glycosphingolipid accumulation in the aortic wall is another feature of human atherosclerosis. Arterioscler Thromb Vasc Biol 1995; 15:1607-15. [PMID: 7583534 DOI: 10.1161/01.atv.15.10.1607] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
High accumulation of lipids is a typical feature of an atherosclerotic lesion. We have previously identified the chemical structure of the major glycosphingolipids (GSLs) of human aorta; however, quantification of the absolute concentration of GSLs was not carried out. In the present study, for the first time we have performed a quantitative comparative analysis of GSL composition in the media and two sublayers of the intima taken from normal regions, fatty streaks, and atherosclerotic plaques of the human aorta. The intimal tissue containing fatty streaks and atherosclerotic plaques accumulated GSLs, predominantly glucosylceramide (GlcCer), lactosylceramide (LacCer), and ganglioside GM3. GSL levels in plaques were highest: GlcCer was 18- and 8-fold, LacCer was 8- and 7-fold, and GM3 was 2.5- and 12-fold higher than in musculoelastic and elastic-hyperplastic intimal layers of normal regions, respectively. We did not observe a significant increase in other GSLs. An increase in the content of gangliosides GD3 and GD1a was detected in the media underlying atherosclerotic lesions. On the basis of an analysis of the ratio of GlcCer, LacCer, and GM3 accumulated in the tissue and cells of the elastic-hyperplastic layer of intima, we have concluded that the accumulation of the above-mentioned GSLs occurs mainly in the extracellular space of the intima. In this study, we have also demonstrated that extracellular lipid liposomes, which appear in the early stages of atherogenesis, are one locus of GSL accumulation in the extracellular space of the intima.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- D N Mukhin
- Institute of Experimental Cardiology, Russian Academy of Medical Sciences, Moscow, Russia
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14
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Affiliation(s)
- S M Schwartz
- Department of Pathology, University of Washington, Seattle 98195-7335, USA
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15
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Immunocytochemical study of the localization of scavenger receptor in human aortic smooth-muscle cells. Bull Exp Biol Med 1995. [DOI: 10.1007/bf02445969] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Mironov AA, Rekhter MD, Kolpakov VA, Andreeva ER, Polishchuk RS, Bannykh SI, Filippov SV, Peretjatko LP, Kulida LV, Orekhov AN. Heterogeneity of smooth muscle cells in embryonic human aorta. Tissue Cell 1995; 27:31-8. [PMID: 7740535 DOI: 10.1016/s0040-8166(95)80006-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Cellular composition of aortas from 5- to 12-week and 18- to 28-week-old human embryos were investigated using immunocytochemistry, scanning and transmission electron microscopy. The aorta of the 5- to 12-week-old embryos consisted of three sublayers differing in cellular composition. The inner sublayer adjacent to the endothelium contained round and ovoid cells with synthetic phenotype. In the intermediate sublayer, spindle-like cells ultrastructurally similar to smooth muscle cells were found. Cells of the outer sublayer resembled fibroblasts or poorly differentiated mesenchymal cells. There were not definite morphological borders between sublayers. In the 18- to 28-week-old embryo aorta the intima was separated from media by internal elastic lamina. Intimal and innermost medial cells had predominately stellate shape and synthetic phenotype. The outer part of media contained spindle-like cells that had well developed contractile structures. Both the 5- to 12-week-old and the 18- to 28-week-old embryo aortic cells were positively stained for alpha-actin and myosin and negatively stained for macrophage antigens. Thus, the majority of embryo aortic cells appeared smooth muscle cells, however there was a regional difference in shape and synthetic state of these cells.
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