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Rubina KA, Semina EV, Kalinina NI, Sysoeva VY, Balatskiy AV, Tkachuk VA. Revisiting the multiple roles of T-cadherin in health and disease. Eur J Cell Biol 2021; 100:151183. [PMID: 34798557 DOI: 10.1016/j.ejcb.2021.151183] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 11/08/2021] [Accepted: 11/08/2021] [Indexed: 01/02/2023] Open
Abstract
As a non-canonical member of cadherin superfamily, T-cadherin was initially described as a molecule involved in homophilic recognition in the nervous and vascular systems. The ensuing decades clearly demonstrated that T-cadherin is a remarkably multifunctional molecule. It was validated as a bona fide receptor for both: LDL exerting adverse atherogenic action and adiponectin mediating many protective metabolic and cardiovascular effects. Motivated by the latest progress and accumulated data unmasking important roles of T-cadherin in blood vessel function and tissue regeneration, here we revisit the original function of T-cadherin as a guidance receptor for the growing axons and blood vessels, consider the recent data on T-cadherin-induced exosomes' biogenesis and their role in myocardial regeneration and revascularization. The review expands upon T-cadherin contribution to mesenchymal stem/stromal cell compartment in adipose tissue. We also dwell upon T-cadherin polymorphisms (SNP) and their possible therapeutic applications. Furthermore, we scrutinize the molecular hub of insulin and adiponectin receptors (AdipoR1 and AdipoR2) conveying signals to their downstream targets in quest for defining a putative place of T-cadherin in this molecular circuitry.
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Affiliation(s)
- K A Rubina
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia.
| | - E V Semina
- Institute of Experimental Cardiology, National Cardiology Research Center of the Ministry of Health of the Russian Federation, 121552 Moscow, Russia
| | - N I Kalinina
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia
| | - V Yu Sysoeva
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia
| | - A V Balatskiy
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia
| | - V A Tkachuk
- Faculty of Medicine, Lomonosov Moscow State University, 119192 Moscow, Russia; Institute of Experimental Cardiology, National Cardiology Research Center of the Ministry of Health of the Russian Federation, 121552 Moscow, Russia
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T-Cadherin and the Ratio of Its Ligands as Predictors of Carotid Atherosclerosis: A Pilot Study. Biomedicines 2021; 9:biomedicines9101398. [PMID: 34680515 PMCID: PMC8533356 DOI: 10.3390/biomedicines9101398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/29/2021] [Accepted: 10/01/2021] [Indexed: 12/27/2022] Open
Abstract
In the cardiovascular system, atherogenic low-density lipoproteins (LDL) and the protective hormone adiponectin bind to the same receptor, T-cadherin. In this study, we tested the hypothesis that the ratio of circulating LDL to high-molecular weight (HMW) adiponectin could predict the development of atherosclerosis. Using enzyme-linked immunosorbent assay, we measured the level of circulating HMW adiponectin in the blood of donors together with ultrasound measuring of intima-media thickness (IMT) of carotid arteries. Single-nucleotide polymorphisms in the T-cadherin gene were identified using polymerase chain reaction. We found that carotid artery IMT is inversely correlated with the level of HMW in male subjects. We also found that the G allele of rs12444338 SNP in the T-cadherin gene correlates with a lower level of circulating T-cadherin and thinner IMT and therefore could be considered as an atheroprotective genotype. Despite our data, we could not provide direct evidence for the initial study hypothesis. However, we did uncover an important correlation between circulating T-cadherin and thinner carotid IMT.
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3
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Sharonov GV, Balatskaya MN, Tkachuk VA. Glycosylphosphatidylinositol-anchored proteins as regulators of cortical cytoskeleton. BIOCHEMISTRY (MOSCOW) 2016; 81:636-50. [DOI: 10.1134/s0006297916060110] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Balatskaya MN, Balatskii AV, Sharonov GV, Tkachuk VA. T-cadherin as a novel receptor regulating metabolism in the blood vessel and heart cells: from structure to function. J EVOL BIOCHEM PHYS+ 2016. [DOI: 10.1134/s0022093016020010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Pyle AL, Atkinson JB, Pozzi A, Reese J, Eckes B, Davidson JM, Crimmins DL, Young PP. Regulation of the atheroma-enriched protein, SPRR3, in vascular smooth muscle cells through cyclic strain is dependent on integrin alpha1beta1/collagen interaction. THE AMERICAN JOURNAL OF PATHOLOGY 2008; 173:1577-88. [PMID: 18832573 DOI: 10.2353/ajpath.2008.080042] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Atherosclerotic plaques express high levels of small proline-rich repeat protein (SPRR3), a previously characterized component of the cornified cell envelope of stratified epithelia, where it is believed to play a role in cellular adaptation to biomechanical stress. We investigated the physiological signals and underlying mechanism(s) that regulate atheroma-enriched SPRR3 expression in vascular smooth muscle cells (VSMCs). We showed that SPRR3 is expressed by VSMCs in both human and mouse atheromas. In cultured arterial VSMCs, mechanical cyclic strain, but neither shear stress nor lipid loading induced SPRR3 expression. Furthermore, this upregulation of SPRR3 expression was dependent on VSMC adherence to type I collagen. To link the mechanoregulation of SPRR3 to specific collagen/integrin interactions, we used blocking antibodies against either integrin alpha1 or alpha2 subunits and VSMCs from mice that lack specific collagen receptors. Our results showed a dependence on the alpha1beta1 integrin for SPRR3 expression induced by cyclic strain. Furthermore, we showed that integrin alpha1 but not alpha2 subunits were expressed on VSMCs within mouse lesions but not in normal arteries. Therefore, we identified the enrichment of the mechanical strain-regulated protein SPRR3 in VSMCs of both human and mouse atherosclerotic lesions whose expression is dependent on the collagen-binding integrin alpha1beta1 on VSMCs. These data suggest that SPRR3 may play a role in VSMC adaptation to local biomechanical stress within the plaque microenvironment.
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Affiliation(s)
- Amy L Pyle
- Vanderbilt University Medical Center, Department of Pathology, Nashville, TN 37232, USA
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6
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da Cunha V, Martin-McNulty B, Vincelette J, Zhang L, Rutledge JC, Wilson DW, Vergona R, Sullivan ME, Wang YX. Interaction between mild hypercholesterolemia, HDL-cholesterol levels, and angiotensin II in intimal hyperplasia in mice. J Lipid Res 2006; 47:476-83. [PMID: 16371646 DOI: 10.1194/jlr.m500341-jlr200] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Two month old C57BL/6 mice were placed on three different diets: 1) normal diet (NC; 0.025% cholesterol), 2) hypercholesterolemic Western-type diet (HC-W; 0.2% cholesterol), and 3) hypercholesterolemic Paigen-type diet (HC-P; 1.25% cholesterol plus 0.5% cholic acid). At 6 months of age, the animals underwent ligation of the left carotid artery and were randomly assigned to vehicle (PBS, subcutaneous) or angiotensin II (Ang II; 1.4 mg/kg/day, subcutaneous) treatment for 4 weeks. Low density lipoprotein-cholesterol levels were similarly increased in both HC diets (NC, 4 +/- 3 mg/dl; HC-W, 123 +/- 17 mg/dl; HC-P, 160 +/- 14 mg/dl). However, the levels of high density lipoprotein-cholesterol (HDL-C) were reduced only in animals fed the HC-P diet (NC, 82 +/- 6 mg/dl; HC-W, 79 +/- 7 mg/dl; HC-P, 58 +/- 7 mg/dl). In Ang II-treated mice, carotid artery ligation induced intimal smooth muscle cell proliferation to a similar extent in NC- and HP-W-fed animals. However, a significantly larger intimal area developed in ligated vessels from Ang II-treated mice fed the HC-P diet (3.6-fold higher than in Ang II-treated NC mice). Together, these results show the accelerating effect of mild hypercholesterolemia, reduced HDL-C levels, and Ang II on intimal hyperplasia after carotid artery ligation in mice.
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Affiliation(s)
- Valdeci da Cunha
- Department of Pharmacology, Berlex Bioscience, Richmond, CA, USA.
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7
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John S, Schmieder RE. Impaired endothelial function in arterial hypertension and hypercholesterolemia: potential mechanisms and differences. J Hypertens 2000; 18:363-74. [PMID: 10779084 DOI: 10.1097/00004872-200018040-00002] [Citation(s) in RCA: 126] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
This review focuses on the role of impaired endothelial function for the development of atherosclerosis in human arterial hypertension and hypercholesterolemia in vivo. Potential mechanisms underlying impaired endothelial function and decreased bioavailability of nitric oxide under these clinical conditions are discussed and potential differences in these mechanisms between arterial hypertension and hypercholesterolemia are outlined. It further addresses therapeutic strategies aiming to improve the bioavailability of nitric oxide in these patients. The overall conclusion is that the bioavailability of nitric oxide is probably impaired not by a single defect, but by various mechanisms affecting nitric oxide synthesis as well as nitric oxide breakdown. In both diseases, increased superoxide anion production and oxidative stress represents a major mechanism. However, potential differences in the underlying mechanisms of superoxide production or nitric oxide synthesis are evident between arterial hypertension and hypercholesterolemia. Decreased bioavailability of nitric oxide does not only impair endothelium-dependent vasodilation, but also activates other mechanisms that play an important role in the pathogenesis of atherosclerosis. Thus, therapeutic strategies should aim to restore bioavailability of nitric oxide, which has been demonstrated for lipid-lowering therapy in hypercholesterolemia. The mechanisms by which nitric oxide bioavailability can be improved by any drug therapy remain to be elucidated and may provide further insights into the mechanisms that are involved in impaired endothelial function and atherogenesis.
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Affiliation(s)
- S John
- Department of Medicine IV, University of Erlangen-Nürnberg, Klinikum Nürnberg-Süd, Nürnberg, Germany
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John S, Delles C, Klingbeil AU, Jacobi J, Schlaich MP, Schmieder RE. Low-density lipoprotein-cholesterol determines vascular responsiveness to angiotensin II in normocholesterolaemic humans. J Hypertens 1999; 17:1933-9. [PMID: 10703892 DOI: 10.1097/00004872-199917121-00024] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE Both LDL-cholesterol and angiotensin II have been shown to increase the risk for and severity of cardiovascular disease. In hypercholesterolaemia, experimental studies have demonstrated an increased angiotensin type 1 (AT1) receptor expression on vascular smooth muscle cells and an increased vascular responsiveness to vasopressors has been documented in humans. We investigated in a normocholesterolaemic young population whether vascular responsiveness to angiotensin II (Ang II) infusion depends on LDL-cholesterol serum levels in the systemic and renal circulation. DESIGN AND METHODS Changes in systolic and diastolic blood pressure (deltaBP) to Ang II infusion (0.5 and 3.0 ng/kg per min) were investigated in 103 normocholesterolaemic (LDL-cholesterol < 160 mg/dl) young white men (26+/-3 years; 24 h BP: 128+/-10/75+/-7 mmHg) without cardiovascular disease. According to their LDL-cholesterol levels, participants were classified into tertiles (lower tertile < 85 mg/dl, middle tertile 85-111 mg/dl, upper tertile > 111 mg/dl). RESULTS Blood pressure (BP) responses to Ang II infusion 3.0 ng/kg per min were enhanced in the group with the highest LDL-cholesterol levels (delta systolic BP: +12.8+/-6.7, +13.2+/-8.6, +17.9+/-9.6, P < 0.02; delta diastolic BP: +11.1+/-5.8, +11.5+/-6.5, +16.5+/-8.3, P < 0.01, for the lower, middle and upper tertiles, respectively). This holds true when baseline BP was taken into account as a confounding covariable (P < 0.015). BP responses to Ang II infusion were related to LDL-cholesterol serum levels (delta systolic BP: r = 0.26, P = 0.01; delta diastolic BP: r = 0.32, P = 0.001). In multiple stepwise regression analysis, LDL-cholesterol emerged as the strongest determinant of vascular responsiveness to Ang II (delta systolic BP: P < 0.01; delta diastolic BP: P < 0.001). CONCLUSION In young male subjects, responsiveness to Ang II is determined by the LDL-cholesterol serum level even in the normal range of LDL-cholesterol, thereby potentially contributing to the cardiovascular risk of LDL-cholesterol even within the so-called normal range.
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Affiliation(s)
- S John
- Department of Medicine IV, University of Erlangen-Nürnberg, Klinikum Nürnberg-Süd, Germany
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9
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Guevara JG, Kang D, Moore JP. Nucleic acid-binding properties of low-density lipoproteins: LDL as a natural gene vector. JOURNAL OF PROTEIN CHEMISTRY 1999; 18:845-57. [PMID: 10839621 DOI: 10.1023/a:1020627212272] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The role of apo B-100 as a transcription factor is indicated by the presence of regions in its primary structure that are similar to the DNA-binding domains of the transcription factors ISGF3gamma, STATs, IRFs, and SREBPs as well as by the presence of 11 RNA-binding KH domains. The Apo B-100 sequence also contains numerous bipartite nuclear localization sequences (NLS). A modified gel shift assay was used to show binding of highly purified preparations of human LDLs to fragmented genomic DNA, plasmid DNA, synthetic oligonucleotides (ISRE, 5'-GGGAAACCGAAACTG and E/C, E-box motif and CCAAT, adipocyte-specific genes promoter site), and total RNA from human liver. LDL was observed to bind preferentially to plasmid DNA containing the hCMV IE2 promoter region. In experiments using human liver total RNA, RNA for five different genes was recovered from LDL and VLDL bands. Gene transfection experiments using human skin fibroblast cells were used to study the gene transfer capacity of LDL. Cells transfected with a pEGFP-N1 plasmid DNA and LDL expressed functional GFP, as indicated by fluorescence, at approximately 3 hrs after transfection. Our results strongly support an alternative role for apo B-100, in toto or perhaps as functional fragments, in the control of gene expression and as gene transfer vector.
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Affiliation(s)
- J G Guevara
- Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA
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10
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Hernández-Perera O, Pérez-Sala D, Navarro-Antolín J, Sánchez-Pascuala R, Hernández G, Díaz C, Lamas S. Effects of the 3-hydroxy-3-methylglutaryl-CoA reductase inhibitors, atorvastatin and simvastatin, on the expression of endothelin-1 and endothelial nitric oxide synthase in vascular endothelial cells. J Clin Invest 1998; 101:2711-9. [PMID: 9637705 PMCID: PMC508862 DOI: 10.1172/jci1500] [Citation(s) in RCA: 532] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Endothelial dysfunction associated with atherosclerosis has been attributed to alterations in the L-arginine-nitric oxide (NO)-cGMP pathway or to an excess of endothelin-1 (ET-1). The 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) have been shown to ameliorate endothelial function. However, the physiological basis of this observation is largely unknown. We investigated the effects of Atorvastatin and Simvastatin on the pre-proET-1 mRNA expression and ET-1 synthesis and on the endothelial NO synthase (eNOS) transcript and protein levels in bovine aortic endothelial cells. These agents inhibited pre-proET-1 mRNA expression in a concentration- and time-dependent fashion (60-70% maximum inhibition) and reduced immunoreactive ET-1 levels (25-50%). This inhibitory effect was maintained in the presence of oxidized LDL (1-50 microg/ml). No significant modification of pre-proET-1 mRNA half-life was observed. In addition, mevalonate, but not cholesterol, reversed the statin-mediated decrease of pre-proET-1 mRNA levels. eNOS mRNA expression was reduced by oxidized LDL in a dose-dependent fashion (up to 57% inhibition), whereas native LDL had no effect. Statins were able to prevent the inhibitory action exerted by oxidized LDL on eNOS mRNA and protein levels. Hence, these drugs might influence vascular tone by modulating the expression of endothelial vasoactive factors.
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Affiliation(s)
- O Hernández-Perera
- Centro de Investigaciones Biológicas, Instituto Reina Sofía de Investigaciones Nefrológicas, Consejo Superior de Investigaciones Científicas, 28006 Madrid, Spain
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11
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Allen S, Khan S, Al-Mohanna F, Batten P, Yacoub M. Native low density lipoprotein-induced calcium transients trigger VCAM-1 and E-selectin expression in cultured human vascular endothelial cells. J Clin Invest 1998; 101:1064-75. [PMID: 9486977 PMCID: PMC508658 DOI: 10.1172/jci445] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Low density lipoprotein (LDL) interactions with the endothelium are thought to play a major role in the development of atherosclerosis. The mechanism(s) involved are not fully understood, although several lines of evidence support the idea that oxidation of LDL increases its atherogenicity. In this study we report for the first time that native LDL (n-LDL) binding to the LDL receptor (100-700 mug/ml) triggers a rise in intracellular calcium which acts as a second messenger to induce vascular cell adhesion molecule-1 (VCAM-1) expression in human coronary artery (HCAEC) and pig aortic endothelial cells (PAEC) and VCAM-1 and E-selectin expression in human aortic (HAEC) endothelial cells. Preincubation of HCAEC with a monoclonal antibody (IgGC7) to the classical LDL receptor or pretreatment with pertussis toxin blocked the n-LDL-induced calcium transients. Preincubation of each of the endothelial cell lines with the calcium chelator 1,-2-bis(o-aminophenoxy)ethane-N,N,N', N'-tetraacetic acetomethyl ester (BAPTA/AM) prevented the expression of VCAM-1 and E-selectin. The increase in VCAM-1 by n-LDL results in increased monocyte binding to HCAEC which can be attenuated by inhibiting the intracellular calcium rise or by blocking the VCAM-1 binding sites. These studies in human and pig endothelial cells link calcium signaling conferred by n-LDL to mechanisms controlling the expression of endothelial cell adhesion molecules involved in atherogenesis.
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MESH Headings
- Animals
- Antibodies, Blocking/immunology
- Arteriosclerosis/metabolism
- Calcium/metabolism
- Cell Adhesion
- Cells, Cultured
- Chelating Agents/pharmacology
- E-Selectin/immunology
- E-Selectin/metabolism
- Egtazic Acid/analogs & derivatives
- Egtazic Acid/pharmacology
- Endothelium, Vascular/metabolism
- Flow Cytometry
- Fluorescent Antibody Technique, Indirect
- Humans
- Lipoproteins, HDL/metabolism
- Lipoproteins, LDL/immunology
- Lipoproteins, LDL/metabolism
- Lipoproteins, VLDL/metabolism
- Microscopy, Confocal
- Monocytes/metabolism
- Oxidation-Reduction
- Pertussis Toxin
- Protein Kinase C/pharmacology
- Receptors, LDL/metabolism
- Signal Transduction
- Swine
- Vascular Cell Adhesion Molecule-1/immunology
- Vascular Cell Adhesion Molecule-1/metabolism
- Virulence Factors, Bordetella/pharmacology
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Affiliation(s)
- S Allen
- Department of Cardiothoracic Surgery, Imperial College of Science, Technology and Medicine, Harefield Hospital, Harefield, Middlesex, UB9 6JH United Kingdom
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Han J, Hajjar DP, Febbraio M, Nicholson AC. Native and modified low density lipoproteins increase the functional expression of the macrophage class B scavenger receptor, CD36. J Biol Chem 1997; 272:21654-9. [PMID: 9261189 DOI: 10.1074/jbc.272.34.21654] [Citation(s) in RCA: 206] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The uptake of oxidized low density lipoprotein (OxLDL) by macrophages is a key event implicated in the initiation and development of atherosclerotic lesions. Two macrophage surface receptors, CD36 (a class B scavenger receptor) and the macrophage scavenger receptor (a class A scavenger receptor), have been identified as the major receptors that bind and internalize OxLDL. Expression of CD36 in monocyte/macrophages in tissue culture is dependent both on the differentiation state as well as exposure to soluble mediators (cytokines and growth factors). The regulatory mechanisms of this receptor in vivo are undetermined as is the role of lipoproteins themselves in modulating CD36 expression. We studied the effect of lipoproteins, native LDL and modified LDL (acetylated LDL (AcLDL) and OxLDL) on the expression of CD36 in J774 cells, a murine macrophage cell line. Exposure to lipoproteins resulted in a marked induction of CD36 mRNA expression (4-8-fold). Time course studies showed that maximum induction was observed 2 h after treatment with AcLDL and at 4 h with LDL and OxLDL. Increased expression of CD36 mRNA persisted for 24 h with each treatment group. Induction of CD36 mRNA expression was paralleled by an increase in CD36 protein as determined by Western blot with the greatest induction by OxLDL (4-fold). In the presence of actinomycin D, treatment of macrophages with LDL, AcLDL, or OxLDL did not affect CD36 mRNA stability, implying that CD36 mRNA was transcriptionally regulated by lipoproteins. To determine the mechanism(s) by which lipoproteins increased expression of CD36 we evaluated the effects of lipoprotein components on CD36 mRNA expression. ApoB 100 increased CD36 mRNA expression significantly, whereas phospholipid/cholesterol liposomes had less effect. Incubation of macrophages with bovine serum albumin or HDL reduced expression of CD36 mRNA in a dose-dependent manner. Finally, to evaluate the in vivo relevance of the induction of CD36 mRNA expression by lipoproteins, peritoneal macrophages were isolated from mice following intraperitoneal injection of lipoproteins. Macrophage expression of CD36 mRNA was significantly increased by LDL, AcLDL, or OxLDL in relation to mice infused with phosphate-buffered saline, with OxLDL causing the greatest induction (8-fold). This is the first demonstration that exposure to free and esterified lipids augments functional expression of the class B scavenger receptor, CD36. These data imply that lipoproteins can further contribute to foam cell development in atherosclerosis by up-regulating a major OxLDL receptor.
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MESH Headings
- Animals
- Arteriosclerosis
- CD36 Antigens/genetics
- CD36 Antigens/metabolism
- Cell Line
- Gene Expression Regulation/drug effects
- Lipoproteins, HDL/pharmacology
- Lipoproteins, LDL/pharmacology
- Macrophages, Peritoneal/metabolism
- Membrane Proteins
- Mice
- Mice, Inbred C57BL
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Receptors, Immunologic/metabolism
- Receptors, LDL/metabolism
- Receptors, Lipoprotein
- Receptors, Scavenger
- Scavenger Receptors, Class A
- Scavenger Receptors, Class B
- Serum Albumin, Bovine/pharmacology
- Up-Regulation
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Affiliation(s)
- J Han
- Department of Pathology, Cornell University Medical College, New York, New York 10021, USA
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Nazih-Sanderson F, Lestavel S, Nion S, Rouy D, Denefle P, Fruchart JC, Clavey V, Delbart C. HDL3 binds to glycosylphosphatidylinositol-anchored proteins to activate signalling pathways. BIOCHIMICA ET BIOPHYSICA ACTA 1997; 1358:103-12. [PMID: 9296527 DOI: 10.1016/s0167-4889(97)00055-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Previous studies have indicated that in HepG2 cells HDL3-signalling involves glycosylphosphatidylinositol (GPI) anchored proteins. HDL3-binding to HepG2 cells was found to be enhanced by cellular preincubation with PI-PLC inhibitors and sensitive to a cellular preincubation with exogenous PI-PLC, suggesting that HDL3 binds directly on GPI-anchored proteins to initiate signaling. Moreover HDL3-binding was found to be partly inhibited by antibodies against the HDL-binding protein (AbHBP). HDL3, when binding to HepG2 cells, promoted the release in the culture medium of a 110 kDa protein that binds AbHBP, while a cellular preincubation with antibodies against the inositol-phosphoglycan (IPG) moiety of GPI-anchor (AbIPG), used to block lipolytic cleavage of the GPI-anchor, inhibits HDL3-induced release of the 110 kDa protein in the culture medium. In [3H]-PC prelabeled HepG2 cells, AbHBP were found to stimulate PC-hydrolysis and DAG generation within 5 min as did HDL3 stimulation. Cellular preincubation with AbIPG was found to inhibit only the HDL3-signal and not the AbHBP-signal, while a prior cellular pretreatment with PI-PLC from Bacillus cereus was found to inhibit the HDL3-and AbHBP-signal. Moreover cellular preincubation with AbHBP for 1 h at 37 degrees C was found to inhibit HDL3-signalling pathways. Our results suggest that in HepG2 cells a 110 kDa protein, which could be HBP, can be anchored to the membrane via GPI, and can function in HDL3-signalling pathways as binding sites.
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Herembert T, Gogusev J, Zhu DL, Drueke TB, Marche P. Control of vascular smooth-muscle cell growth by macrophage-colony-stimulating factor. Biochem J 1997; 325 ( Pt 1):123-8. [PMID: 9224637 PMCID: PMC1218536 DOI: 10.1042/bj3250123] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Since in several vascular diseases abnormal vascular smooth-muscle cell (VSMC) proliferation is often associated with the presence of macrophages, we examined whether macrophage-colony-stimulating factor (M-CSF) might play a role in the control of VSMC growth. VSMCs were isolated from rat aorta and maintained in culture. Using a bioassay, a macrophage-colony-stimulating activity was detected in the serum-free supernatant of VSMCs, which could be inhibited by the addition of specific anti-M-CSF antibodies. The presence of M-CSF receptor protein and of M-CSF and M-CSF receptor gene transcripts was demonstrated by immunocytochemistry, using a specific anti-c-Fms antibody and Northern blot analysis respectively. [3H]Thymidine incorporation was measured following the addition to quiescent VSMCs of various dilutions of L929 cell supernatant (as a source of M-CSF) or of recombinant M-CSF. Both exogenous M-CSF and serum-free VSMC conditioned medium promoted DNA synthesis in a concentration-dependent manner, and this effect could be abrogated by the presence of a specific anti-M-CSF antibody. Under similar experimental conditions, L929 cell supernatant modulated proto-oncogene expression, as assessed by Northern blot analysis of c-fos, c-myc, egr-1 and junB. It was further demonstrated that M-CSF could act in synergy with thrombin, platelet-derived growth factor or basic fibroblast growth factor in promoting VSMC DNA synthesis. These results support the hypothesis that M-CSF affects the growth of cultured rat VSMCs through paracrine/autocrine mechanisms. Its effects at both the macrophage and the VSMC level confer to M-CSF a central role in the development of vascular lesions that occurs during atherosclerotic progression.
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MESH Headings
- Actins/biosynthesis
- Animals
- Aorta, Thoracic/cytology
- Aorta, Thoracic/drug effects
- Aorta, Thoracic/physiology
- Cell Division/drug effects
- Cells, Cultured
- Culture Media, Conditioned
- L Cells
- Macrophage Colony-Stimulating Factor/biosynthesis
- Macrophage Colony-Stimulating Factor/pharmacology
- Macrophage Colony-Stimulating Factor/physiology
- Mice
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/physiology
- Platelet-Derived Growth Factor/pharmacology
- RNA, Messenger/biosynthesis
- Rats
- Rats, Inbred WKY
- Receptor, Macrophage Colony-Stimulating Factor/biosynthesis
- Thrombin/pharmacology
- Thymidine/metabolism
- Transcription, Genetic
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Affiliation(s)
- T Herembert
- Université René Descartes and Department of Pharmacology, CNRS URA 1482, CHU Necker, 156 rue de Vaugirard, 75015 Paris, France
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Nazih-Sanderson F, Pinchon G, Nion S, Fruchart JC, Delbart C. HDL3-signalling in HepG2 cells involves glycosyl-phosphatidylinositol-anchored proteins. BIOCHIMICA ET BIOPHYSICA ACTA 1997; 1346:45-60. [PMID: 9187302 DOI: 10.1016/s0005-2760(97)00017-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
In [3H]phosphatidylcholine (PC) prelabelled HepG2 cells, HDL3 stimulates a biphasic increase in 1.2-diacylglycerol (DAG). The early phase is mediated in part by a phospholipase C which is inhibited by 10 microM D 609, RHC-80267 or U-73122 and less by 100 microM propranolol. A phospholipase D is more likely involved in the late phase, as the DAG peak lags behind phosphatidic acid rise and is blocked by 100 microM propranolol. Cellular preincubation with 200 microg/ml antibodies against the inositolphosphoglycan (IPG) moiety of the GPI-anchor (Ab(IPG)), or depletion in GPI-anchored proteins by cellular pretreatment with 0.5 U/ml PI-PLC, 1 mM insulin and 2 HU/ml streptolysin-O, or depletion in membrane cholesterol content by filipin (5 microg/ml), digitonin (5 microg/ml) and cholesterol oxidase (0.5 U/ml) decreases the HDL3-signal, suggesting the involvement of a lipolytic cleavage of GPI-anchored proteins. Inhibition of proteases by 1 mM leupeptin/PMSF improves the response time to HDL3, with a DAG peak at 2-3 min. In the presence of protease-inhibitors, HDL3 releases in the culture medium several proteins with a residual IPG that binds Ab(IPG) after SDS-PAGE analysis and immunoblotting. HDL3-signalling pathways comprise tyrosine kinases, as preincubation with 100 microg/ml genistein or tyrphostin inhibits the HDL3-signal. HDL3 activates PC hydrolysis through a multistep pathway involving the cleavage of GPI-anchored proteins.
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Guevara J, Walch ET, Epstein HF, Sparrow JT, Gotto AM, Valentinova NV. Evidence that apoB-100 of low-density lipoproteins is a novel Src-related protein kinase. JOURNAL OF PROTEIN CHEMISTRY 1995; 14:627-31. [PMID: 8561859 DOI: 10.1007/bf01886889] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Protein-tyrosine kinases of signal transduction pathways occur and function intracellularly. In contrast, the low-density lipoprotein (LDL) particle circulates in plasma, where its function is to solubilize and transport lipid. Recently, several reports showed that LDL may have a role in signal transduction. We have identified a region in the apoB-100 primary structure which shows similarity to Src-homology-1 (SH1) domains, the kinase region of protein-tyrosine kinases. Results obtained in protein kinase assays of highly purified LDL showed that only the apoB-100 was phosphorylated, suggesting that apoB-100 has the capacity to undergo autophosphorylation like known protein-tyrosine kinases. Phosphorylation was not observed for any other apolipoprotein in LDL or for any component of high-density lipoprotein and lipoprotein [a]. Our results suggest that apoB-100 may be a novel and functional member of the src protein kinase family.
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Affiliation(s)
- J Guevara
- Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA
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