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Lubrano V, Balzan S, Papa A. LOX-1 variants modulate the severity of cardiovascular disease: state of the art and future directions. Mol Cell Biochem 2024; 479:2245-2254. [PMID: 37789136 DOI: 10.1007/s11010-023-04859-0] [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: 06/30/2023] [Accepted: 09/12/2023] [Indexed: 10/05/2023]
Abstract
Atherosclerosis is one of the major causes of cerebral infarction and many other ischemic cardio-cerebrovascular diseases. Although large randomized clinical trials have highlighted the impressive benefits of lipid-lowering therapies, the 50-70% of patients who have achieved their lipid-lowering goal remain at high cardiovascular disease risk. For this reason, there is a need to investigate other markers of atherosclerosis progression. LOX-1 is a scavenger receptor that accepts oxidized low-density lipoproteins as major ligand and internalizes it by endocytosis favoring its retention in subendothelial layer and triggering a wide variety of proatherogenic events. However, other factors such as cytokines, shear stress, and advanced glycation end-products can upregulate LOX-1. LOX-1 is encoded by the OLR1 gene, located in the p12.3-p13 region of chromosome 12. OLR1 gene has different isoforms induced by splicing, or single-nucleotide polymorphisms (SNPs). According to some authors, the expression of these isoforms induces a different effect on atherosclerosis and cardiovascular disease. In particular, LOXIN, an isoform lacking part of the functional domain, exerts an important role in atherosclerosis protection. In other cases, studies on SNPs showed an association with more severe forms, like in the case of 3'UTR polymorphisms. The knowledge of these variants can give rise to the development of new preventive therapies and can lead to the identification of subjects at greater risk of cardiovascular event. In this review, we reported the state of the art regarding SNPs with known effects on OLR1 splicing and how LOX-1 variants modulate the severity of cardiovascular disease.
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Affiliation(s)
- Valter Lubrano
- Fondazione CNR/Regione Toscana G. Monasterio, Via Moruzzi 1, 56124, Pisa, Italy.
| | - Silvana Balzan
- Institute of Clinical Physiology, CNR, Via Moruzzi 1, 56124, Pisa, Italy
| | - Angela Papa
- Fondazione CNR/Regione Toscana G. Monasterio, Via Moruzzi 1, 56124, Pisa, Italy
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2
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Akkuş M, Solak H. Elevated levels of oxLDL and LOX-1: Implications for schizophrenia pathophysiology. J Psychiatr Res 2024; 177:140-146. [PMID: 39013288 DOI: 10.1016/j.jpsychires.2024.07.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 06/21/2024] [Accepted: 07/10/2024] [Indexed: 07/18/2024]
Abstract
Inflammation and oxidative stress are both considered to be factors in the etiopathogenesis of schizophrenia. LOX-1 (lectin-like oxidized low-density lipoprotein receptor-1) and ox-LDL (oxidized low-density lipoprotein) have been reported to be active in neuroinflammation pathways in which they are involved in oxidative stress and inflammation. However, its relationship with schizophrenia is unclear. This study aimed to assess the potential connection between serum ox-LDL and LOX-1 levels in schizophrenia patients, their unaffected first-degree relatives, and healthy controls. The study comprised 63 schizophrenia patients, 57 first-degree relatives, and 63 healthy controls who were age, gender, and BMI-matched. Serum ox-LDL and LOX-1 levels were measured. PANSS was used to assess the severity of the disease. Levels of both ox-LDL and LOX-1 were markedly elevated in individuals diagnosed with schizophrenia when compared to both their relatives and a control group. While ox-LDL levels were significantly higher in relatives of patients compared to controls, there was no significant difference between relatives of patients and control groups for LOX-1 levels. Significant correlations were observed between PANNS general and total and ox-LDL levels and PANNS negative and LOX-1 levels. The relationship between ox-LDL and LOX-1 and schizophrenia is quite limited in the literature and is a new field of study. Future studies are needed to evaluate their role in etiopathogenesis.
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Affiliation(s)
- Merve Akkuş
- Department of Psychiatry, Kütahya Health Sciences University, Faculty of Medicine, Vefa Alayunt Street, 43100, Kutahya Province, Kütahya, Turkey.
| | - Hatice Solak
- Department of Physiology, Faculty of Medicine, Kütahya Health Science University, Evliya Çelebi Campus, Tavşanlı Road 10th Km, 43100, Kutahya Province, Kütahya, Turkey.
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3
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Lefèbre J, Falk T, Ning Y, Rademacher C. Secondary Sites of the C-type Lectin-Like Fold. Chemistry 2024; 30:e202400660. [PMID: 38527187 DOI: 10.1002/chem.202400660] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2024] [Revised: 03/23/2024] [Accepted: 03/25/2024] [Indexed: 03/27/2024]
Abstract
C-type lectins are a large superfamily of proteins involved in a multitude of biological processes. In particular, their involvement in immunity and homeostasis has rendered them attractive targets for diverse therapeutic interventions. They share a characteristic C-type lectin-like domain whose adaptability enables them to bind a broad spectrum of ligands beyond the originally defined canonical Ca2+-dependent carbohydrate binding. Together with variable domain architecture and high-level conformational plasticity, this enables C-type lectins to meet diverse functional demands. Secondary sites provide another layer of regulation and are often intricately linked to functional diversity. Located remote from the canonical primary binding site, secondary sites can accommodate ligands with other physicochemical properties and alter protein dynamics, thus enhancing selectivity and enabling fine-tuning of the biological response. In this review, we outline the structural determinants allowing C-type lectins to perform a large variety of tasks and to accommodate the ligands associated with it. Using the six well-characterized Ca2+-dependent and Ca2+-independent C-type lectin receptors DC-SIGN, langerin, MGL, dectin-1, CLEC-2 and NKG2D as examples, we focus on the characteristics of non-canonical interactions and secondary sites and their potential use in drug discovery endeavors.
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Affiliation(s)
- Jonathan Lefèbre
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
- Vienna Doctoral School of Pharmaceutical, Nutritional and Sport, Sciences, University of Vienna, Vienna, Austria
- Department of Microbiology, Immunology and Genetics, University of Vienna, Max F. Perutz Labs, Vienna, Austria
| | - Torben Falk
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
- Vienna Doctoral School of Pharmaceutical, Nutritional and Sport, Sciences, University of Vienna, Vienna, Austria
- Department of Microbiology, Immunology and Genetics, University of Vienna, Max F. Perutz Labs, Vienna, Austria
| | - Yunzhan Ning
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
- Vienna Doctoral School of Pharmaceutical, Nutritional and Sport, Sciences, University of Vienna, Vienna, Austria
- Department of Microbiology, Immunology and Genetics, University of Vienna, Max F. Perutz Labs, Vienna, Austria
| | - Christoph Rademacher
- Department of Pharmaceutical Sciences, University of Vienna, Vienna, Austria
- Department of Microbiology, Immunology and Genetics, University of Vienna, Max F. Perutz Labs, Vienna, Austria
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4
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Munno M, Mallia A, Greco A, Modafferi G, Banfi C, Eligini S. Radical Oxygen Species, Oxidized Low-Density Lipoproteins, and Lectin-like Oxidized Low-Density Lipoprotein Receptor 1: A Vicious Circle in Atherosclerotic Process. Antioxidants (Basel) 2024; 13:583. [PMID: 38790688 PMCID: PMC11118168 DOI: 10.3390/antiox13050583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 05/06/2024] [Accepted: 05/07/2024] [Indexed: 05/26/2024] Open
Abstract
Atherosclerosis is a complex condition that involves the accumulation of lipids and subsequent plaque formation in the arterial intima. There are various stimuli, cellular receptors, and pathways involved in this process, but oxidative modifications of low-density lipoprotein (ox-LDL) are particularly important in the onset and progression of atherosclerosis. Ox-LDLs promote foam-cell formation, activate proinflammatory pathways, and induce smooth-muscle-cell migration, apoptosis, and cell death. One of the major receptors for ox-LDL is LOX-1, which is upregulated in several cardiovascular diseases, including atherosclerosis. LOX-1 activation in endothelial cells promotes endothelial dysfunction and induces pro-atherogenic signaling, leading to plaque formation. The binding of ox-LDLs to LOX-1 increases the generation of reactive oxygen species (ROS), which can induce LOX-1 expression and oxidize LDLs, contributing to ox-LDL generation and further upregulating LOX-1 expression. This creates a vicious circle that is amplified in pathological conditions characterized by high plasma levels of LDLs. Although LOX-1 has harmful effects, the clinical significance of inhibiting this protein remains unclear. Further studies both in vitro and in vivo are needed to determine whether LOX-1 inhibition could be a potential therapeutic target to counteract the atherosclerotic process.
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Affiliation(s)
- Marco Munno
- Unit of Functional Proteomics, Metabolomics and Network Analysis, Centro Cardiologico Monzino, 20138 Milan, Italy; (M.M.); (A.M.); (A.G.); (G.M.); (S.E.)
| | - Alice Mallia
- Unit of Functional Proteomics, Metabolomics and Network Analysis, Centro Cardiologico Monzino, 20138 Milan, Italy; (M.M.); (A.M.); (A.G.); (G.M.); (S.E.)
- Dipartimento di Biologia e Biotecnologie “Lazzaro Spallanzani”, Università di Pavia, 27100 Pavia, Italy
| | - Arianna Greco
- Unit of Functional Proteomics, Metabolomics and Network Analysis, Centro Cardiologico Monzino, 20138 Milan, Italy; (M.M.); (A.M.); (A.G.); (G.M.); (S.E.)
| | - Gloria Modafferi
- Unit of Functional Proteomics, Metabolomics and Network Analysis, Centro Cardiologico Monzino, 20138 Milan, Italy; (M.M.); (A.M.); (A.G.); (G.M.); (S.E.)
| | - Cristina Banfi
- Unit of Functional Proteomics, Metabolomics and Network Analysis, Centro Cardiologico Monzino, 20138 Milan, Italy; (M.M.); (A.M.); (A.G.); (G.M.); (S.E.)
| | - Sonia Eligini
- Unit of Functional Proteomics, Metabolomics and Network Analysis, Centro Cardiologico Monzino, 20138 Milan, Italy; (M.M.); (A.M.); (A.G.); (G.M.); (S.E.)
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5
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Tang H, Xiao Y, Qian L, Wang Z, Lu M, Yao N, Zhou T, Tian F, Cao L, Zheng P, Dong X. Mechanistic insights into the C-type lectin receptor CLEC12A-mediated immune recognition of monosodium urate crystal. J Biol Chem 2024; 300:105765. [PMID: 38367667 PMCID: PMC10959670 DOI: 10.1016/j.jbc.2024.105765] [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: 10/20/2023] [Revised: 02/06/2024] [Accepted: 02/13/2024] [Indexed: 02/19/2024] Open
Abstract
CLEC12A, a member of the C-type lectin receptor family involved in immune homeostasis, recognizes MSU crystals released from dying cells. However, the molecular mechanism underlying the CLEC12A-mediated recognition of MSU crystals remains unclear. Herein, we reported the crystal structure of the human CLEC12A-C-type lectin-like domain (CTLD) and identified a unique "basic patch" site on CLEC12A-CTLD that is necessary for the binding of MSU crystals. Meanwhile, we determined the interaction strength between CLEC12A-CTLD and MSU crystals using single-molecule force spectroscopy. Furthermore, we found that CLEC12A clusters at the cell membrane and seems to serve as an internalizing receptor of MSU crystals. Altogether, these findings provide mechanistic insights for understanding the molecular mechanisms underlying the interplay between CLEC12A and MSU crystals.
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Affiliation(s)
- Hua Tang
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, School of Life Sciences, Nanjing University, Nanjing, China; Engineering Research Center of Protein and Peptide Medicine, Ministry of Education, Nanjing, China.
| | - Yuelong Xiao
- State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, China
| | - Lei Qian
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, School of Life Sciences, Nanjing University, Nanjing, China
| | - Zibin Wang
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, School of Life Sciences, Nanjing University, Nanjing, China
| | - Ming Lu
- Westlake laboratory, Westlake University, Hangzhou, Zhejiang, China
| | - Nan Yao
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, School of Life Sciences, Nanjing University, Nanjing, China
| | - Ting Zhou
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, School of Life Sciences, Nanjing University, Nanjing, China
| | - Fang Tian
- State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, China
| | - Longxing Cao
- Westlake laboratory, Westlake University, Hangzhou, Zhejiang, China
| | - Peng Zheng
- State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu, China.
| | - Xianchi Dong
- State Key Laboratory of Pharmaceutical Biotechnology, Department of Biochemistry, School of Life Sciences, Nanjing University, Nanjing, China; Engineering Research Center of Protein and Peptide Medicine, Ministry of Education, Nanjing, China; Institute of Artificial Intelligence Biomedicine, Nanjing University, Nanjing, China.
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6
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Borges TJ, Lima K, Murshid A, Lape IT, Zhao Y, Rigo MM, Lang BJ, Siddiqui SS, Hui E, Riella LV, Bonorino C, Calderwood SK. Innate extracellular Hsp70 inflammatory properties are mediated by the interaction of Siglec-E and LOX-1 receptors. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.12.01.569623. [PMID: 38106019 PMCID: PMC10723335 DOI: 10.1101/2023.12.01.569623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
Innate immune responses to cell damage-associated molecular patterns induce a controlled degree of inflammation, ideally avoiding the promotion of intense unwanted inflammatory adverse events. When released by damaged cells, Hsp70 can stimulate different responses that range from immune activation to immune suppression. The effects of Hsp70 are mediated through innate receptors expressed primarily by myeloid cells, such as dendritic cells (DCs). The regulatory innate receptors that bind to extracellular mouse Hsp70 (mHsp70) are not fully characterized, and neither are their potential interactions with activating innate receptors. Here, we describe that extracellular mHsp70 interacts with a receptor complex formed by inhibitory Siglec-E and activating LOX-1 on DCs. We also find that this interaction takes place within lipid microdomains, and Siglec-E acts as a negative regulator of LOX-1-mediated innate activation upon mHsp70 or oxidized LDL binding. Thus, HSP70 can both bind to and modulate the interaction of inhibitory and activating innate receptors on the cell surface. These findings add another dimension of regulatory mechanism to how self-molecules contribute to dampening of exacerbated inflammatory responses.
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7
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Birts CN, Wilton DC. Could anionic LDL be a ligand for RAGE and TREM2 in addition to LOX-1 and thus exacerbate lung disease and dementia? Biochim Biophys Acta Mol Basis Dis 2023; 1869:166837. [PMID: 37544530 DOI: 10.1016/j.bbadis.2023.166837] [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: 05/05/2023] [Revised: 07/14/2023] [Accepted: 07/31/2023] [Indexed: 08/08/2023]
Abstract
We recently highlighted the potential of protein glycation to generate anionic (electronegative) surfaces. We hypothesised that these anionic proteins are perceived by the innate immune system as arising from infection or damaged cell components, producing an inflammatory response within the lung involving the receptor RAGE. We now review two other pathologies linked to the innate immune response, cardiovascular disease and dementia that involve receptors LOX-1 and TREM2 respectively. Remarkable similarities in properties between RAGE, LOX-1 and TREM2 suggest that electronegative LDL may act as a pathogenic anionic ligand for all three receptors and exacerbate lung inflammation and dementia.
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Affiliation(s)
- Charles N Birts
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK; Antibody and Vaccine Group, Centre for Cancer Immunology, School of Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton SO16 6YD, UK; Institute for Life Sciences, University of Southampton, Southampton SO17 1BJ, UK.
| | - David C Wilton
- School of Biological Sciences, Faculty of Environmental and Life Sciences, University of Southampton, Southampton SO17 1BJ, UK
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8
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Roper BWR, Tiede C, Abdul-Zani I, Cuthbert GA, Jade D, Al-Aufi A, Critchley WR, Saikia Q, Homer-Vanniasinkam S, Sawamura T, McPherson MJ, Harrison MA, Tomlinson DC, Ponnambalam S. "Affimer" synthetic protein scaffolds block oxidized LDL binding to the LOX-1 scavenger receptor and inhibit ERK1/2 activation. J Biol Chem 2023; 299:105325. [PMID: 37805141 PMCID: PMC10641530 DOI: 10.1016/j.jbc.2023.105325] [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: 01/20/2023] [Revised: 09/11/2023] [Accepted: 09/21/2023] [Indexed: 10/09/2023] Open
Abstract
In multicellular organisms, a variety of lipid-protein particles control the systemic flow of triacylglycerides, cholesterol, and fatty acids between cells in different tissues. The chemical modification by oxidation of these particles can trigger pathological responses, mediated by a group of membrane proteins termed scavenger receptors. The lectin-like oxidized low-density lipoprotein (LOX-1) scavenger receptor binds to oxidized low-density lipoprotein (oxLDL) and mediates both signaling and trafficking outcomes. Here, we identified five synthetic proteins termed Affimers from a phage display library, each capable of binding recombinant LOX-1 extracellular (oxLDL-binding) domain with high specificity. These Affimers, based on a phytocystatin scaffold with loop regions of variable sequence, were able to bind to the plasma membrane of HEK293T cells exclusively when human LOX-1 was expressed. Binding and uptake of fluorescently labeled oxLDL by the LOX-1-expressing cell model was inhibited with subnanomolar potency by all 5 Affimers. ERK1/2 activation, stimulated by oxLDL binding to LOX-1, was also significantly inhibited (p < 0.01) by preincubation with LOX-1-specific Affimers, but these Affimers had no direct agonistic effect. Molecular modeling indicated that the LOX-1-specific Affimers bound predominantly via their variable loop regions to the surface of the LOX-1 lectin-like domain that contains a distinctive arrangement of arginine residues previously implicated in oxLDL binding, involving interactions with both subunits of the native, stable scavenger receptor homodimer. These data provide a new class of synthetic tools to probe and potentially modulate the oxLDL/LOX-1 interaction that plays an important role in vascular disease.
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Affiliation(s)
- Barnaby W R Roper
- School of Molecular & Cellular Biology, University of Leeds, Leeds, UK
| | - Christian Tiede
- School of Molecular & Cellular Biology, University of Leeds, Leeds, UK
| | - Izma Abdul-Zani
- School of Molecular & Cellular Biology, University of Leeds, Leeds, UK
| | - Gary A Cuthbert
- School of Molecular & Cellular Biology, University of Leeds, Leeds, UK; Leeds Vascular Institute, Leeds General Infirmary, Leeds, UK
| | - Dhananjay Jade
- School of Biomedical Sciences, University of Leeds, Leeds, UK
| | - Ahmed Al-Aufi
- School of Molecular & Cellular Biology, University of Leeds, Leeds, UK; Leeds Vascular Institute, Leeds General Infirmary, Leeds, UK
| | | | - Queen Saikia
- School of Molecular & Cellular Biology, University of Leeds, Leeds, UK
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9
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Takeda S, Hamamuki A, Ushirogata K, Takasuka TE. Binding properties of recombinant LDL receptor and LOX-1 receptor to LDL measured using bio-layer interferometry and atomic force microscopy. Biophys Chem 2023; 300:107069. [PMID: 37385179 DOI: 10.1016/j.bpc.2023.107069] [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: 02/13/2023] [Revised: 05/26/2023] [Accepted: 06/09/2023] [Indexed: 07/01/2023]
Abstract
Oxidation of low-density lipoproteins (LDLs) triggers a recognition by scavenger receptors such as lectin-like oxidized LDL receptor-1 (LOX-1) and is related to inflammation and cardiovascular diseases. Although LDLs that are recognized by LOX-1 can be risk-related LDLs, conventional LDL detection methods using commercially available recombinant receptors remain undeveloped. Using a bio-layer interferometry (BLI), we investigated the binding of recombinant LOX-1 (reLOX-1) and LDL receptors to the oxidized LDLs. The recombinant LDL receptor preferably bound minimally modified LDLs, while the reLOX-1 recognized extensively oxidized LDLs. An inversed response of the BLI was observed during the binding in the case of reLOX-1. AFM study showed that the extensively oxidized LDLs and aggregates of LDLs were observed on the surface, supporting the results. Altogether, a combined use of these recombinant receptors and the BLI method is useful in detecting high-risk LDLs such as oxidized LDLs and modified LDLs.
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Affiliation(s)
- Seiji Takeda
- Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 15-4-1, Maeda 7-Jo, Teine-ku, Sapporo, Hokkaido 006-8585, Japan.
| | - Ao Hamamuki
- Faculty of Pharmaceutical Sciences, Hokkaido University of Science, 15-4-1, Maeda 7-Jo, Teine-ku, Sapporo, Hokkaido 006-8585, Japan
| | - Kanako Ushirogata
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Kita 9, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0809, Japan
| | - Taichi E Takasuka
- Research Faculty of Agriculture, Hokkaido University, Sapporo, Kita 9, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0809, Japan; Global Station for Food, Land and Water Resources, Hokkaido University, Sapporo, Kita 9, Nishi 9, Kita-ku, Sapporo, Hokkaido 060-0809, Japan
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10
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METABOLITE PROFILING, HYPOLIPIDEMIC, and ANTI-ATHEROSCLEROSIS ACTIVITY of MIXED VEGETABLE FERMENTATION EXTRACT. Saudi Pharm J 2023; 31:639-654. [PMID: 37181140 PMCID: PMC10172600 DOI: 10.1016/j.jsps.2023.03.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 03/01/2023] [Indexed: 03/11/2023] Open
Abstract
Although positive association between fermented vegetables intake with the risk of coronary heart disease (CHD) has increased attention nowadays, the metabolite profiling and the mechanism of action are still elusive. This study designed to investigate the secondary metabolites, hypolipidemic, and anti-atherogenic effect of mixed vegetable fermentation extract (MVFE). The metabolite screening of the MVFE was assessed using the Liquid Chromatography Tandem Mass Spectrophotometer (LC-MS/MS) method. The result of LC-MS/MS was used as ligands to inhibit the binding of oxidized LDL (oxLDL) and Cluster Differentiation 36 (CD36), Scavenger Receptor A1 (SRA1), Lectin-type oxidized LDL receptor 1 (LOX1). This work was performed with molecular docking using Discovery Studio 2021, PyRx 0.9, and Autodock Vina 4.2 followed by analyzing Network Pharmacology, Protein Protein Interaction (PPI) using Cytoscape 3.9.1 and String 2.0.0. Finally, the clinical effect of MVFE was evaluated using in vivo study. Twenty rabbits were assigned to normal, negative control, and MVFE group that were fed with standard diet, high fat diet (HFD), HFD supplemented with MVFE 100, 200 mg/kg BW, respectively. The serum level of Total Cholesterol (TC) and Low-Density Lipoprotein (LDL-c) were detected at the end of week 4. The LC-MS/MS analysis identified 17 compounds categorized as peptides, fatty acids, polysaccharides, nucleoside, flavonoids, flavanols, and phenolic compounds. Based on the docking study, more negative binding affinity was observed in the interaction between metabolites with the scavenger receptors (SR) than simvastatin. The number of nodes and edges based on Network Pharmacology analysis were 268 and 482, respectively. The PPI network showed that MVFE metabolites exerts its athero-protective effect by modulating various cellular processes including inflammation, improvement of endothelial function, and modulation of lipid metabolism. Blood TC and LDL-c concentrations in the negative control (458.82 ± 82.03; 191.87 ± 92.16 mg/dL) were higher significantly compared to the normal group (87.03 ± 29.27; 43.33 ± 5.75 mg/dL). The MVFE administration decreased the TC (100, 200 mg/kg BW MVFE: 269.96 ± 85.34; 130.17 ± 45.02 mg/dL) and LDL-c level (100, 200 mg/kg BW MVFE = 87.24 ± 22.85; 41.82 ± 11.08 mg/dL) dose-dependently (p < 0,001). The secondary metabolites derived from fermented mixed vegetables extract might be developed as a potential strategy to prevent CHD by targeting the multiple pathways in atherosclerosis.
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11
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Borges TJ, Murshid A, Theriault J, Calderwood SK. Molecular Chaperone Receptors: An Update. Methods Mol Biol 2023; 2693:193-208. [PMID: 37540436 DOI: 10.1007/978-1-0716-3342-7_15] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
Extracellular heat shock proteins (HSP) play important roles in cell signaling and immunity. Many of these effects are mediated by surface receptors expressed on a wide range of cell types, including immune cells. We have investigated the nature of such proteins by cloning candidate receptors into cells (CHO-K1) with the rare property of being null for HSP binding. Using this approach, we have discovered that mammalian and eukaryotic Hsp70 binds avidly to at least three classes of receptor including: (1) c-type lectin receptors (CLR), (2) scavenger receptors (SR) and (3) lectins. However, the structural nature of the receptor-ligand interactions is not currently clear. Hsp70 can bind to LOX-1 (a member of both the CLR and SR), with the c-type lectin binding domain (CTLD), to the SR family members SREC-I and FEEL-1/CLEVER-1/STABILIN-1, which by contrast have arrays of EGF-like repeats in their extracellular domains as well. In this chapter, we will discuss: (1) methods for the discovery of HSP receptors, (2) approaches to the study of individual receptors in cells that contain multiple such receptors and (3) methods for investigating HSP receptor function in vivo.
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Affiliation(s)
- Thiago J Borges
- Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Ayesha Murshid
- Molecular and Cellular Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Jimmy Theriault
- Molecular and Cellular Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Stuart K Calderwood
- Molecular and Cellular Radiation Oncology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
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12
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Tomar A, Sahoo S, Aathi M, Kuila S, Khan MA, Ravi GRR, Jeyaraman J, Mehta JL, Varughese KI, Arockiasamy A. Exploring the druggability of oxidized low-density lipoprotein (ox-LDL) receptor, LOX-1, a proatherogenic drug target involved in atherosclerosis. Biochem Biophys Res Commun 2022; 623:59-65. [PMID: 35872543 DOI: 10.1016/j.bbrc.2022.07.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 07/10/2022] [Indexed: 11/16/2022]
Abstract
Lectin-like oxidized low-density lipoprotein (ox-LDL) receptor 1 (LOX-1) is a vital scavenger receptor involved in ox-LDL binding, internalization, and subsequent proatherogenic signaling leading to cellular dysfunction and atherosclerotic plaque formation. Existing data suggest that modulation of ox-LDL - LOX-1 interaction can prevent or slow down atherosclerosis. Therefore, we utilized computational methods such as multi-solvent simulation and characterized two top-ranked druggable sites. Using systematic molecular docking followed by atomistic molecular dynamics simulation, we have identified and shortlisted small molecules from the NCI library that target two key binding sites. We demonstrate, using surface plasmon resonance (SPR), that four of the shortlisted molecules bind one-on-one to the purified C-terminal domain (CTLD) of LOX-1 receptor with high affinity (KD), ranging from 4.9 nM to 20.1 μM. Further, we performed WaterMap analysis to understand the role of individual water molecules in small molecule binding and the LOX-1-ligand complex stability. Our data clearly show that LOX-1 is druggable with small molecules. Our study provides strategies to identify novel inhibitors to attenuate ox-LDL - LOX-1 interaction.
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Affiliation(s)
- Akanksha Tomar
- Membrane Protein Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Sibasis Sahoo
- Membrane Protein Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Muthusankar Aathi
- Membrane Protein Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Shobhan Kuila
- Membrane Protein Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Mohd Azeem Khan
- Membrane Protein Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India
| | - Guru Raj Rao Ravi
- Structural Biology and Bio-Computing Laboratory, Department of Bioinformatics, Science Block, Alagappa University, Karaikudi, Tamil Nadu, 630004, India
| | - Jeyakanthan Jeyaraman
- Structural Biology and Bio-Computing Laboratory, Department of Bioinformatics, Science Block, Alagappa University, Karaikudi, Tamil Nadu, 630004, India
| | - Jawahar L Mehta
- Division of Cardiology, University of Arkansas for Medical Sciences and the VA Medical Center, Little Rock, AR, 72205, USA
| | - Kottayil I Varughese
- Department of Physiology and Cell Biology, University of Arkansas for Medical Sciences, Little Rock, AR, 72205, USA
| | - Arulandu Arockiasamy
- Membrane Protein Biology Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, New Delhi, 110067, India.
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13
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The structural basis of effective LOX-1 inhibition. Future Med Chem 2022; 14:731-743. [PMID: 35466695 DOI: 10.4155/fmc-2022-0011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Along with other scavenger receptors, splice variants of LOX-1 play an important role in modulating numerous subcellular mechanisms such as normal cell development, differentiation and growth in response to physiological stimuli. Thus, LOX-1 activity is a key regulator in determining the severity of many genetic, metabolic, cardiovascular, renal, and neurodegenerative diseases and/or cancer. Increased expression of LOX-1 precipitates pathological disorders during the aging process. Therefore, it becomes important to develop novel LOX-1 inhibitors based on its ligand binding polarity and/or affinity and disrupt the uptake of its ligand: oxidized low-density lipoproteins (ox-LDL). In this review, we shed light on the presently studied and developed novel LOX-1 inhibitors that may have potential for treatment of diseases characterized by LOX-1 activation.
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14
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Willment JA. Fc-conjugated C-type lectin receptors: Tools for understanding host-pathogen interactions. Mol Microbiol 2021; 117:632-660. [PMID: 34709692 DOI: 10.1111/mmi.14837] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 10/25/2021] [Indexed: 12/24/2022]
Abstract
The use of soluble fusion proteins of pattern recognition receptors (PRRs) used in the detection of exogenous and endogenous ligands has helped resolve the roles of PRRs in the innate immune response to pathogens, how they shape the adaptive immune response, and function in maintaining homeostasis. Using the immunoglobulin (Ig) crystallizable fragment (Fc) domain as a fusion partner, the PRR fusion proteins are soluble, stable, easily purified, have increased affinity due to the Fc homodimerization properties, and consequently have been used in a wide range of applications such as flow cytometry, screening of protein and glycan arrays, and immunofluorescent microscopy. This review will predominantly focus on the recognition of pathogens by the cell membrane-expressed glycan-binding proteins of the C-type lectin receptor (CLR) subgroup of PRRs. PRRs bind to conserved pathogen-associated molecular patterns (PAMPs), such as glycans, usually located within or on the outer surface of the pathogen. Significantly, many glycans structures are identical on both host and pathogen (e.g. the Lewis (Le) X glycan), allowing the use of Fc CLR fusion proteins with known endogenous and/or exogenous ligands as tools to identify pathogen structures that are able to interact with the immune system. Screens of highly purified pathogen-derived cell wall components have enabled identification of many unique PAMP structures recognized by CLRs. This review highlights studies using Fc CLR fusion proteins, with emphasis on the PAMPs found in fungi, bacteria, viruses, and parasites. The structure and unique features of the different CLR families is presented using examples from a broad range of microbes whenever possible.
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Affiliation(s)
- Janet A Willment
- Medical Research Council Centre for Medical Mycology, University of Exeter, Exeter, UK
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15
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Akhmedov A, Sawamura T, Chen CH, Kraler S, Vdovenko D, Lüscher TF. Lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1): a crucial driver of atherosclerotic cardiovascular disease. Eur Heart J 2021; 42:1797-1807. [PMID: 36282110 DOI: 10.1093/eurheartj/ehaa770] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/18/2020] [Accepted: 09/07/2020] [Indexed: 12/16/2022] Open
Abstract
Cardiovascular diseases (CVDs), specifically lipid-driven atherosclerotic CVDs, remain the number one cause of death worldwide. The lectin-like oxidized low-density lipoprotein (LDL) receptor-1 (LOX-1), a scavenger receptor that promotes endothelial dysfunction by inducing pro-atherogenic signalling and plaque formation via the endothelial uptake of oxidized LDL (oxLDL) and electronegative LDL, contributes to the initiation, progression, and destabilization of atheromatous plaques, eventually leading to the development of myocardial infarction and certain forms of stroke. In addition to its expression in endothelial cells, LOX-1 is expressed in macrophages, cardiomyocytes, fibroblasts, dendritic cells, lymphocytes, and neutrophils, further implicating this receptor in multiple aspects of atherosclerotic plaque formation. LOX-1 holds promise as a novel diagnostic and therapeutic target for certain CVDs; therefore, understanding the molecular structure and function of LOX-1 is of critical importance. In this review, we highlight the latest scientific findings related to LOX-1, its ligands, and their roles in the broad spectrum of CVDs. We describe recent findings from basic research, delineate their translational value, and discuss the potential of LOX-1 as a novel target for the prevention, diagnosis, and treatment of related CVDs.
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Affiliation(s)
- Alexander Akhmedov
- Center for Molecular Cardiology, University of Zurich, Wagistreet 12, Schlieren 8952, Switzerland
| | - Tatsuya Sawamura
- Department of Molecular Pathophysiology, Shinshu University School of Medicine, Shinshu University 3-1-1, Asahi, Matsumoto 390-8621, Japan
| | - Chu-Huang Chen
- Vascular and Medical Research, Texas Heart Institute, 6770 Bertner Avenue, Houston, TX 77030, USA
| | - Simon Kraler
- Center for Molecular Cardiology, University of Zurich, Wagistreet 12, Schlieren 8952, Switzerland
| | - Daria Vdovenko
- Center for Molecular Cardiology, University of Zurich, Wagistreet 12, Schlieren 8952, Switzerland
| | - Thomas F Lüscher
- Center for Molecular Cardiology, University of Zurich, Wagistreet 12, Schlieren 8952, Switzerland.,Royal Brompton and Harefield Hospitals, Sydney Street, London SW3 6NP, UK.,National Heart and Lung Institute, Imperial College, Dovehause Street, London SW3 6LY, UK
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16
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Hashimoto K, Akagi M. The role of oxidation of low-density lipids in pathogenesis of osteoarthritis: A narrative review. J Int Med Res 2021; 48:300060520931609. [PMID: 32552129 PMCID: PMC7303502 DOI: 10.1177/0300060520931609] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Osteoarthritis (OA) is a chronic joint disorder that causes degeneration of
cartilage, synovial inflammation, and formation of osteophytes. Aging, obesity,
and sex are considered the main risk factors of OA. Recent studies have
suggested that metabolic syndrome (MetS) disorders, such as hypertension,
hyperlipidemia, diabetes mellitus, and obesity, may be involved in the
pathogenesis and progression of OA. MetS disorders are common diseases that also
result in atherosclerosis. Researchers believe that OA and atherosclerosis have
underlying similar molecular mechanisms because the prevalence of both diseases
increases with age. Oxidation of low-density lipoprotein (ox-LDL) is believed to
play a role in the pathogenesis of atherosclerosis. Recent reports have shown
that ox-LDL and low-density lipoprotein receptor 1 (LOX-1) are involved in the
pathogenesis of OA. The purpose of this narrative review is to summarize the
current understanding of the role of the LOX-1/ox-LDL system in the pathogenesis
of OA and to reveal common underlying molecular pathways that are shared by MetS
in OA and the LOX-1/ox-LDL system.
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Affiliation(s)
- Kazuhiko Hashimoto
- Department of Orthopaedic Surgery, Kindai University Hospital, Osaka-Sayama City, Osaka, Japan
| | - Masao Akagi
- Department of Orthopaedic Surgery, Kindai University Hospital, Osaka-Sayama City, Osaka, Japan
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17
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Di L, Maiseyeu A. Low-density lipoprotein nanomedicines: mechanisms of targeting, biology, and theranostic potential. Drug Deliv 2021; 28:408-421. [PMID: 33594923 PMCID: PMC7894439 DOI: 10.1080/10717544.2021.1886199] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Native nanostructured lipoproteins such as low- and high-density lipoproteins (LDL and HDL) are powerful tools for the targeted delivery of drugs and imaging agents. While the cellular recognition of well-known HDL-based carriers occurs via interactions with an HDL receptor, the selective delivery and uptake of LDL particles by target cells are more complex. The most well-known mode of LDL-based delivery is via the interaction between apolipoprotein B (Apo-B) - the main protein of LDL - and the low-density lipoprotein receptor (LDLR). LDLR is expressed in the liver, adipocytes, and macrophages, and thus selectively delivers LDL carriers to these cells and tissues. Moreover, the elevated expression of LDLR in tumor cells indicates a role for LDL in the targeted delivery of chemotherapy drugs. In addition, chronic inflammation associated with hypercholesterolemia (i.e., high levels of endogenous LDL) can be abated by LDL carriers, which outcompete the deleterious oxidized LDL for uptake by macrophages. In this case, synthetic LDL nanocarriers act as 'eat-me' signals and exploit mechanisms of native LDL uptake for targeted drug delivery and imaging. Lastly, recent studies have shown that the delivery of LDL-based nanocarriers to macrophages via fluid-phase pinocytosis is a promising tool for atherosclerosis imaging. Hence, the present review summarizes the use of natural and synthetic LDL-based carriers for drug delivery and imaging and discusses various mechanisms of targeting.
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Affiliation(s)
- Lin Di
- Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Clevehand, OH, USA
| | - Andrei Maiseyeu
- Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Clevehand, OH, USA
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18
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Raposo CD, Canelas AB, Barros MT. Human Lectins, Their Carbohydrate Affinities and Where to Find Them. Biomolecules 2021; 11:188. [PMID: 33572889 PMCID: PMC7911577 DOI: 10.3390/biom11020188] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 01/02/2021] [Accepted: 01/26/2021] [Indexed: 12/20/2022] Open
Abstract
Lectins are a class of proteins responsible for several biological roles such as cell-cell interactions, signaling pathways, and several innate immune responses against pathogens. Since lectins are able to bind to carbohydrates, they can be a viable target for targeted drug delivery systems. In fact, several lectins were approved by Food and Drug Administration for that purpose. Information about specific carbohydrate recognition by lectin receptors was gathered herein, plus the specific organs where those lectins can be found within the human body.
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Affiliation(s)
- Cláudia D. Raposo
- LAQV-Requimte, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal;
| | - André B. Canelas
- Glanbia-AgriChemWhey, Lisheen Mine, Killoran, Moyne, E41 R622 Tipperary, Ireland;
| | - M. Teresa Barros
- LAQV-Requimte, Department of Chemistry, NOVA School of Science and Technology, Universidade NOVA de Lisboa, 2829-516 Caparica, Portugal;
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19
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Mentrup T, Cabrera-Cabrera F, Schröder B. Proteolytic Regulation of the Lectin-Like Oxidized Lipoprotein Receptor LOX-1. Front Cardiovasc Med 2021; 7:594441. [PMID: 33553253 PMCID: PMC7856673 DOI: 10.3389/fcvm.2020.594441] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 12/21/2020] [Indexed: 11/13/2022] Open
Abstract
The lectin-like oxidized-LDL (oxLDL) receptor LOX-1, which is broadly expressed in vascular cells, represents a key mediator of endothelial activation and dysfunction in atherosclerotic plaque development. Being a member of the C-type lectin receptor family, LOX-1 can bind different ligands, with oxLDL being the best characterized. LOX-1 mediates oxLDL uptake into vascular cells and by this means can promote foam cell formation. In addition, LOX-1 triggers multiple signaling pathways, which ultimately induce a pro-atherogenic and pro-fibrotic transcriptional program. However, the molecular mechanisms underlying this signal transduction remain incompletely understood. In this regard, proteolysis has recently emerged as a regulatory mechanism of LOX-1 function. Different proteolytic cleavages within the LOX-1 protein can initiate its turnover and control the cellular levels of this receptor. Thereby, cleavage products with individual biological functions and/or medical significance are produced. Ectodomain shedding leads to the release of a soluble form of the receptor (sLOX1) which has been suggested to have diagnostic potential as a biomarker. Removal of the ectodomain leaves behind a membrane-bound N-terminal fragment (NTF), which despite being devoid of the ligand-binding domain is actively involved in signal transduction. Degradation of this LOX-1 NTF, which represents an athero-protective mechanism, critically depends on the aspartyl intramembrane proteases Signal peptide peptidase-like 2a and b (SPPL2a/b). Here, we present an overview of the biology of LOX-1 focusing on how proteolytic cleavages directly modulate the function of this receptor and, what kind of pathophysiological implications this has in cardiovascular disease.
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Affiliation(s)
| | | | - Bernd Schröder
- Institute for Physiological Chemistry, Technische Universität Dresden, Dresden, Germany
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20
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Barreto J, Karathanasis SK, Remaley A, Sposito AC. Role of LOX-1 (Lectin-Like Oxidized Low-Density Lipoprotein Receptor 1) as a Cardiovascular Risk Predictor: Mechanistic Insight and Potential Clinical Use. Arterioscler Thromb Vasc Biol 2020; 41:153-166. [PMID: 33176449 DOI: 10.1161/atvbaha.120.315421] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Atherosclerosis, the underlying cause of cardiovascular disease (CVD), is a worldwide cause of morbidity and mortality. Reducing ApoB-containing lipoproteins-chiefly, LDL (low-density lipoprotein)-has been the main strategy for reducing CVD risk. Although supported by large randomized clinical trials, the persistence of residual cardiovascular risk after effective LDL reduction has sparked an intense search for other novel CVD biomarkers and therapeutic targets. Recently, Lox-1 (lectin-type oxidized LDL receptor 1), an innate immune scavenger receptor, has emerged as a promising target for early diagnosis and cardiovascular risk prediction and is also being considered as a treatment target. Lox-1 was first described as a 50 kDa transmembrane protein in endothelial cells responsible for oxLDL (oxidized LDL) recognition, triggering downstream pathways that intensify atherosclerosis via endothelial dysfunction, oxLDL uptake, and apoptosis. Lox-1 is also expressed in platelets, where it enhances platelet activation, adhesion to endothelial cells, and ADP-mediated aggregation, thereby favoring thrombus formation. Lox-1 was also identified in cardiomyocytes, where it was implicated in the development of cardiac fibrosis and myocyte apoptosis, the main determinants of cardiac recovery following an ischemic insult. Together, these findings have revealed that Lox-1 is implicated in all the main steps of atherosclerosis and has encouraged the development of immunoassays for measurement of sLox-1 (serum levels of soluble Lox-1) to be used as a potential CVD biomarker. Finally, the recent development of synthetic Lox-1 inhibitors and neutralizing antibodies with promising results in animal models has made Lox-1 a target for drug development. In this review, we discuss the main findings regarding the role of Lox-1 in the development, diagnosis, and therapeutic strategies for CVD prevention and treatment.
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Affiliation(s)
- Joaquim Barreto
- Atherosclerosis and Vascular Biology Lab (Atherolab), Clinical Research Center, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Brazil (J.B., A.C.S.)
| | - Sotirios K Karathanasis
- National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD (S.K.K., A.R.)
- NeoProgen, Baltimore, MD (S.K.K.)
| | - Alan Remaley
- National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD (S.K.K., A.R.)
| | - Andrei C Sposito
- Atherosclerosis and Vascular Biology Lab (Atherolab), Clinical Research Center, Faculty of Medical Sciences, State University of Campinas (UNICAMP), Brazil (J.B., A.C.S.)
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21
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Vinod V, Pushkaran AC, Kumar A, Mohan CG, Biswas R. Interaction mechanism of Mycobacterium tuberculosis GroEL2 protein with macrophage Lectin-like, oxidized low-density lipoprotein receptor-1: An integrated computational and experimental study. Biochim Biophys Acta Gen Subj 2020; 1865:129758. [PMID: 33031906 DOI: 10.1016/j.bbagen.2020.129758] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 09/30/2020] [Accepted: 10/01/2020] [Indexed: 11/18/2022]
Abstract
BACKGROUND Bacterial surface proteins act as potential adhesins or invasins. The GroEL is a signal peptide-free surface expressed protein that aids adhesion in Escherichia coli by binding to LOX-1 receptor of the host cells. Mycobacterium tuberculosis (Mtb) expresses GroEL2 protein, having high level sequence identity with E. coli GroEL. This study investigates the interaction mechanism of GroEL2 protein of Mtb with LOX-1 of macrophages using integrated computational and experimental approach. METHODS Mtb GroEL2 protein was purified as histidine tagged protein using Ni-NTA chromatography. Confocal and scanning electron microscopies were used to study the uptake of GroEL2 coated fluorescent latex beads through the LOX-1 receptor in RAW264.7 macrophage cell line. Docking studies were performed to understand the interaction between the GroEL2 and LOX-1 proteins. Polyinosinic acid (PIA) was used as a LOX-1 inhibitor in both in silico and in vitro experiments. RESULTS GroEL2 protein coating enhances uptake of latex beads into macrophages through LOX-1 receptor. LOX-1 inhibitor PIA decreased the uptake of GroEL2 coated latex beads. GroEL2 interacts with the key ligand binding regions of the LOX-1 receptor, such as the basic spine and the saddle hydrophobic patch. PIA molecule destabilized the LOX-1-GroEL2 docked complex. CONCLUSION Surface associated GroEL2 protein of Mtb is a potential ligand for macrophage LOX-1 receptor. Interaction between GroEL2 and LOX-1 receptor may be utilized by Mtb to gain its intracellular access. GENERAL SIGNIFICANCE Surface associated GroEL2 of Mtb may bind to the macrophage LOX-1 receptor, enabling the internalization of the bacteria and progression of the infection.
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Affiliation(s)
- Vivek Vinod
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences and Research Center (AIMS), Amrita Vishwa Vidyapeetham, Kochi 682041, Kerala, India
| | - Anju Choorakottayil Pushkaran
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences and Research Center (AIMS), Amrita Vishwa Vidyapeetham, Kochi 682041, Kerala, India
| | - Anil Kumar
- Department of Microbiology, Amrita Institute of Medical Sciences and Research Center, Amrita Vishwa Vidyapeetham, Kochi 682041, Kerala, India
| | - Chethampadi Gopi Mohan
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences and Research Center (AIMS), Amrita Vishwa Vidyapeetham, Kochi 682041, Kerala, India..
| | - Raja Biswas
- Center for Nanosciences and Molecular Medicine, Amrita Institute of Medical Sciences and Research Center (AIMS), Amrita Vishwa Vidyapeetham, Kochi 682041, Kerala, India..
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22
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Bagchi AK, Surendran A, Malik A, Jassal DS, Ravandi A, Singal PK. IL-10 attenuates OxPCs-mediated lipid metabolic responses in ischemia reperfusion injury. Sci Rep 2020; 10:12120. [PMID: 32694752 PMCID: PMC7374703 DOI: 10.1038/s41598-020-68995-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Accepted: 01/03/2020] [Indexed: 12/12/2022] Open
Abstract
Oxidized phospholipids (OxPLs) promote inflammation as well as low density lipoprotein (LDL) uptake in a variety of physiological and pathological states. Given the anti-inflammatory role of the cytokine IL-10, we investigated its modulatory effect on the production of oxidized phosphatidylcholines (OxPCs) as well as lipid metabolic responses in global myocardial ischemia/reperfusion (I/R) injury. Increased OxPCs levels, by 1-Palmitoyl-2-(5-oxovaleryl)-sn-glycero-3-phosphocholine (POVPC), promoted oxidative stress (OS) and cell death. OxPCs-mediated-OS, resulted in oxidized low-density lipoprotein receptor 1 (LOX-1) activation and upregulated the expression of toll-like receptor 2 (TLR2). IL-10-induced increase in proprotein convertase subtilisin/kexin type 9 (PCSK9) negatively regulated LOX-1 as well as TLR2 inflammatory responses. Under stress conditions, phosphorylation of sterol regulatory element binding protein 1c (SREBP 1c) was prevented by IL-10. The latter also prevented the generation of OxPCs and reduced their ratio (OxPCs/PCs) during injury. LOX-1 activation also promoted SREBP1c-mediated TGF-βRII expression which was inhibited by IL-10. Both fragmented and non-fragmented OxPCs were elevated during I/R and this effect was attenuated by IL-10. The largest impact (two–threefold change at log2) was on PAzPC, (1-palmitoyl-2-azelaoyl-sn-glycero-3-phosphocholine)—a fragmented OxPC. Thus it appears that among different OxPCs, IL-10 significantly reduces a single molecule (PAzPC)-mediated lipid metabolic responses in cardiomyocytes thereby mitigating inflammation and cell death.
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Affiliation(s)
- Ashim K Bagchi
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada.,Department of Physiology and Pathophysiology, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada
| | - Arun Surendran
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada.,Department of Physiology and Pathophysiology, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada
| | - Akshi Malik
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada.,Department of Physiology and Pathophysiology, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada
| | - Davinder S Jassal
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada.,Section of Cardiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada
| | - Amir Ravandi
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada.,Section of Cardiology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Canada
| | - Pawan K Singal
- Institute of Cardiovascular Sciences, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada. .,Department of Physiology and Pathophysiology, St. Boniface Hospital Albrechtsen Research Centre, 351 Tache Ave. Room R3022, Winnipeg, MB, R2H 2A6, Canada.
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23
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A small-molecule inhibitor of lectin-like oxidized LDL receptor-1 acts by stabilizing an inactive receptor tetramer state. Commun Chem 2020; 3:75. [PMID: 36703453 PMCID: PMC9814544 DOI: 10.1038/s42004-020-0321-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Accepted: 05/15/2020] [Indexed: 01/29/2023] Open
Abstract
The C-type lectin family member lectin-like oxidized LDL receptor-1 (LOX-1) has been object of intensive research. Its modulation may offer a broad spectrum of therapeutic interventions ranging from cardiovascular diseases to cancer. LOX-1 mediates uptake of oxLDL by vascular cells and plays an important role in the initiation of endothelial dysfunction and its progression to atherosclerosis. So far only a few compounds targeting oxLDL-LOX-1 interaction are reported with a limited level of characterization. Here we describe the identification and characterization of BI-0115, a selective small molecule inhibitor of LOX-1 that blocks cellular uptake of oxLDL. Identified by a high throughput screening campaign, biophysical analysis shows that BI-0115 binding triggers receptor inhibition by formation of dimers of the homodimeric ligand binding domain. The structure of LOX-1 bound to BI-0115 shows that inter-ligand interactions at the receptor interfaces are key to the formation of the receptor tetramer thereby blocking oxLDL binding.
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24
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Liang YQ, Kakino A, Matsuzaka Y, Mashimo T, Isono M, Akamatsu T, Shimizu H, Tajima M, Kaneko T, Li L, Takeuchi F, Sawamura T, Kato N. LOX-1 (Lectin-Like Oxidized Low-Density Lipoprotein Receptor-1) Deletion Has Protective Effects on Stroke in the Genetic Background of Stroke-Prone Spontaneously Hypertensive Rat. Stroke 2020; 51:1835-1843. [PMID: 32397936 DOI: 10.1161/strokeaha.120.029421] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Background and Purpose- oxLDL (oxidized low-density lipoprotein) has been known for its potential to induce endothelial dysfunction and used as a major serological marker of oxidative stress. Recently, LOX-1 (lectin-like oxidized low-density lipoprotein receptor-1), a lectin-like receptor for oxLDL, has attracted attention in studies of neuronal apoptosis and stroke. We aim to investigate the impact of LOX-1-deficiency on spontaneous hypertension-related brain damage in the present study. Methods- We generated a LOX-1 deficient strain on the genetic background of stroke-prone spontaneously hypertensive rat (SHRSP), an animal model of severe hypertension and spontaneous stroke. In this new disease model with stroke-proneness, we monitored the occurrence of brain abnormalities with and without salt loading by multiple procedures including T2 weighted magnetic resonance imaging and also explored circulatory miRNAs as diagnostic biomarkers for cerebral ischemic injury by microarray analysis. Results- Both T2 weighted magnetic resonance imaging abnormalities and physiological parameter changes could be detected at significantly delayed timing in LOX-1 knockout rats compared with wild-type SHRSP, in either case of normal rat chow and salt loading (P<0.005 in all instances; n=11-20 for SHRSP and n=13-23 for LOX-1 knockout rats). There were no significant differences in the form of magnetic resonance imaging findings between the strains. A number of miRNAs expressed in the normal rat plasma, including rno-miR-150-5p and rno-miR-320-3p, showed significant changes after spontaneous brain damage in SHRSP, whereas the corresponding changes were modest or almost unnoticeable in LOX-1 knockout rats. There appeared to be the lessening of correlation of postischemic miRNA alterations between the injured brain tissue and plasma in LOX-1 knockout rats. Conclusions- Our data show that deficiency of LOX-1 has a protective effect on spontaneous brain damage in a newly generated LOX-1-deficient strain of SHRSP. Further, our analysis of miRNAs as biomarkers for ischemic brain damage supports a potential involvement of LOX-1 in blood brain barrier disruption after cerebral ischemia. Visual Overview- An online visual overview is available for this article.
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Affiliation(s)
- Yi-Qiang Liang
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine
| | - Akemi Kakino
- Department of Molecular Pathophysiology, Shinshu University School of Medicine (A.K., T.S.).,Institute for Biomedical Sciences, Shinshu University (A.K., T.S.)
| | - Yasunari Matsuzaka
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine
| | - Tomoji Mashimo
- Institute of Medical Science, The University of Tokyo (T.M.).,Institute of Experimental Animal Sciences Graduate School of Medicine, Osaka University (T.M.)
| | - Masato Isono
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine
| | - Tomohisa Akamatsu
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine.,Department of Pediatrics (T.A.), National Center for Global Health and Medicine
| | - Hana Shimizu
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine
| | - Michiko Tajima
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine
| | - Takehito Kaneko
- Graduate School of Science and Engineering, Iwate University (T.K.)
| | - Lei Li
- Department of Vascular Physiology, National Cerebral and Cardiovascular Center (L.L.)
| | - Fumihiko Takeuchi
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine
| | - Tatsuya Sawamura
- Department of Molecular Pathophysiology, Shinshu University School of Medicine (A.K., T.S.).,Institute for Biomedical Sciences, Shinshu University (A.K., T.S.)
| | - Norihiro Kato
- From the Department of Gene Diagnostics and Therapeutics (Y.-Q.L., Y.M., M.I., T.A., H.S., M.T., F.T., N.K.), National Center for Global Health and Medicine
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25
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Nakashima-Nakasuga C, Hazama S, Suzuki N, Nakagami Y, Xu M, Yoshida S, Tomochika S, Fujiwara N, Matsukuma S, Matsui H, Tokumitsu Y, Kanekiyo S, Shindo Y, Maeda N, Tsunedomi R, Iida M, Takeda S, Yoshino S, Ueno T, Hamamoto Y, Ogihara H, Hoshii Y, Nagano H. Serum LOX-1 is a novel prognostic biomarker of colorectal cancer. Int J Clin Oncol 2020; 25:1308-1317. [PMID: 32277394 DOI: 10.1007/s10147-020-01673-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Accepted: 03/30/2020] [Indexed: 02/07/2023]
Abstract
BACKGROUND Colorectal cancer is the third most common cancer worldwide. If biomarkers can be identified in liquid biopsy, diagnosis and treatment can be optimized even when cancerous tissues are not available. The purpose of this study was to identify proteins from liquid biopsy that would be useful as markers of poor prognosis. METHODS First, we comprehensively analyzed serum proteins to identify potential biomarkers and focused on serum lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1). The relationship between LOX-1 and the prognosis of patients with colorectal cancer has not been reported. Next, we validated this marker using serum samples from 238 patients with colorectal cancer by ELISA and 100 tissue samples by immunohistochemical staining. RESULTS The optimal cut-off value of serum LOX-1 was 538.7 pg/mL according to time-dependent receiver operating characteristics curve analysis. The overall survival of patients with high levels of serum LOX-1 was significantly poorer than that of individuals with low levels of LOX-1 in the training and test datasets. In multivariate analysis for overall survival, serum LOX-1 was an independent prognostic factor identified in liquid biopsy (hazard ratio = 1.729, p = 0.027). The prognosis of patients with high LOX-1 expression in tumor tissues was significantly poorer than that of individuals with low expression (p =0.047 ). Additionally, inflammatory factors such as white blood cell count, C-reactive protein level, neutrophil/lymphocyte ratio, and monocyte/lymphocyte ratio were significantly higher in the group with high serum LOX-1 levels. CONCLUSIONS Serum LOX-1 might be a useful biomarker of poor prognosis in colorectal cancer.
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Affiliation(s)
- Chiyo Nakashima-Nakasuga
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Shoichi Hazama
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan.,Department of Translational Research and Developmental Therapeutics against Cancer, Yamaguchi University School of Medicine, Ube, Japan
| | - Nobuaki Suzuki
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Yuki Nakagami
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan.,Department of Translational Research and Developmental Therapeutics against Cancer, Yamaguchi University School of Medicine, Ube, Japan
| | - Ming Xu
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Shin Yoshida
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Shinobu Tomochika
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Nobuyuki Fujiwara
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Satoshi Matsukuma
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Hiroto Matsui
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Yukio Tokumitsu
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Shinsuke Kanekiyo
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Yoshitaro Shindo
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Noriko Maeda
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Ryouichi Tsunedomi
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Michihisa Iida
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | - Shigeru Takeda
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan
| | | | - Tomio Ueno
- Department of Gastroenterological Surgery, Kawasaki Medical School, Kurashiki, Japan
| | - Yoshihiko Hamamoto
- Division of Electrical, Electronic and Information Engineering, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube, Japan
| | - Hiroyuki Ogihara
- Division of Electrical, Electronic and Information Engineering, Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Ube, Japan
| | - Yoshinobu Hoshii
- Department of Diagnostic Pathology, Yamaguchi University Hospital, Ube, Japan
| | - Hiroaki Nagano
- Department of Gastroenterological, Breast and Endocrine Surgery, Yamaguchi University Graduate School of Medicine, 1-1-1 Minami-Kogushi, Ube, Yamaguchi, 755-8505, Japan.
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26
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Murshid A, Borges TJ, Bonorino C, Lang BJ, Calderwood SK. Immunological Outcomes Mediated Upon Binding of Heat Shock Proteins to Scavenger Receptors SCARF1 and LOX-1, and Endocytosis by Mononuclear Phagocytes. Front Immunol 2020; 10:3035. [PMID: 31998315 PMCID: PMC6968791 DOI: 10.3389/fimmu.2019.03035] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 12/11/2019] [Indexed: 01/06/2023] Open
Abstract
Heat shock proteins (HSP) are a highly abundant class of molecular chaperones that can be released into the extracellular milieu and influence the immune response. HSP release can occur when cells undergo necrosis and exude their contents. However, HSPs are also secreted from intact cells, either in free form or in lipid vesicles including exosomes to react with receptors on adjacent cells. Target cells are able recognize extracellular HSPs through cell surface receptors. These include scavenger receptors (SR) such as class E member oxidized low-density lipoprotein receptor-1 (LOX-1, aka OLR1, Clec8A, and SR-E1) and scavenger receptor class F member 1 (SCARF1, aka SREC1). Both receptors are expressed by dendritic cells (DC) and macrophages. These receptors can bind HSPs coupled to client binding proteins and deliver the chaperone substrate to the pathways of antigen processing in cells. SR are able to facilitate the delivery of client proteins to the proteasome, leading to antigen processing and presentation, and stimulation of adaptive immunity. HSPs may also may be involved in innate immunity through activation of inflammatory signaling pathways in a mechanism dependent on SR and toll-like receptor 4 (TLR4) on DC and macrophages. We will discuss the pathways by which HSPs can facilitate uptake of protein antigens and the receptors that regulate the ensuing immune response.
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Affiliation(s)
- Ayesha Murshid
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States
| | - Thiago J Borges
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States.,Renal Division, Schuster Family Transplantation Research Center, Harvard Medical School and Brigham and Women's Hospital, Boston, MA, United States
| | - Cristina Bonorino
- Laboratório de Immunoterapia, Departmento de Ciências Básicas da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre, Porto Alegre, Brazil.,Department of Surgery, School of Medicine, University of California, San Diego, San Diego, CA, United States
| | - Benjamin J Lang
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States
| | - Stuart K Calderwood
- Department of Radiation Oncology, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, United States
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27
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Tsilingiri K, de la Fuente H, Relaño M, Sánchez-Díaz R, Rodríguez C, Crespo J, Sánchez-Cabo F, Dopazo A, Alonso-Lebrero JL, Vara A, Vázquez J, Casasnovas JM, Alfonso F, Ibáñez B, Fuster V, Martínez-González J, Martín P, Sánchez-Madrid F. Oxidized Low-Density Lipoprotein Receptor in Lymphocytes Prevents Atherosclerosis and Predicts Subclinical Disease. Circulation 2019; 139:243-255. [PMID: 30586697 DOI: 10.1161/circulationaha.118.034326] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Although the role of Th17 and regulatory T cells in the progression of atherosclerosis has been highlighted in recent years, their molecular mediators remain elusive. We aimed to evaluate the association between the CD69 receptor, a regulator of Th17/regulatory T cell immunity, and atherosclerosis development in animal models and in patients with subclinical disease. METHODS Low-density lipoprotein receptor-deficient chimeric mice expressing or not expressing CD69 on either myeloid or lymphoid cells were subjected to a high fat diet. In vitro functional assays with human T cells were performed to decipher the mechanism of the observed phenotypes. Expression of CD69 and NR4A nuclear receptors was evaluated by reverse transcription-polymerase chain reaction in 305 male participants of the PESA study (Progression of Early Subclinical Atherosclerosis) with extensive (n=128) or focal (n=55) subclinical atherosclerosis and without disease (n=122). RESULTS After a high fat diet, mice lacking CD69 on lymphoid cells developed large atheroma plaque along with an increased Th17/regulatory T cell ratio in blood. Oxidized low-density lipoprotein was shown to bind specifically and functionally to CD69 on human T lymphocytes, inhibiting the development of Th17 cells through the activation of NR4A nuclear receptors. Participants of the PESA study with evidence of subclinical atherosclerosis displayed a significant CD69 and NR4A1 mRNA downregulation in peripheral blood leukocytes compared with participants without disease. The expression of CD69 remained associated with the risk of subclinical atherosclerosis in an adjusted multivariable logistic regression model (odds ratio, 0.62; 95% CI, 0.40-0.94; P=0.006) after adjustment for traditional risk factors, the expression of NR4A1, the level of oxidized low-density lipoprotein, and the counts of different leucocyte subsets. CONCLUSIONS CD69 depletion from the lymphoid compartment promotes a Th17/regulatory T cell imbalance and exacerbates the development of atherosclerosis. CD69 binding to oxidized low-density lipoprotein on T cells induces the expression of anti-inflammatory transcription factors. Data from a cohort of the PESA study with subclinical atherosclerosis indicate that CD69 expression in PBLs inversely correlates with the presence of disease. The expression of CD69 remained an independent predictor of subclinical atherosclerosis after adjustment for traditional risk factors.
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Affiliation(s)
- Katerina Tsilingiri
- Vascular Pathophysiology Area (K.T., M.R., R.S.-D., V.F., P.M., F.S.-M.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Hortensia de la Fuente
- Department of Immunology (H.d.L.F., J.L.A.-L., A.V., F.S.-M.), Instituto de Investigación Sanitaria Hospital de la Princesa, IIS-IP, Madrid, Spain.,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
| | - Marta Relaño
- Vascular Pathophysiology Area (K.T., M.R., R.S.-D., V.F., P.M., F.S.-M.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Raquel Sánchez-Díaz
- Vascular Pathophysiology Area (K.T., M.R., R.S.-D., V.F., P.M., F.S.-M.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
| | - Cristina Rodríguez
- Institut de Recerca del Hospital de la Santa Creu i Sant Pau-Programa ICCC, IIB-Sant Pau, Barcelona, Spain (C.R., J.C.).,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
| | - Javier Crespo
- Institut de Recerca del Hospital de la Santa Creu i Sant Pau-Programa ICCC, IIB-Sant Pau, Barcelona, Spain (C.R., J.C.).,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
| | - Fátima Sánchez-Cabo
- Bioinformatics Unit (F.S.-C.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - Ana Dopazo
- Genomics Unit (A.D.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | - José L Alonso-Lebrero
- Department of Immunology (H.d.L.F., J.L.A.-L., A.V., F.S.-M.), Instituto de Investigación Sanitaria Hospital de la Princesa, IIS-IP, Madrid, Spain
| | - Alicia Vara
- Department of Immunology (H.d.L.F., J.L.A.-L., A.V., F.S.-M.), Instituto de Investigación Sanitaria Hospital de la Princesa, IIS-IP, Madrid, Spain
| | - Jesús Vázquez
- Proteomics Unit (J.V.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain
| | | | - Fernando Alfonso
- Department of Cardiology (F.A.), Instituto de Investigación Sanitaria Hospital de la Princesa, IIS-IP, Madrid, Spain
| | - Borja Ibáñez
- Myocardial Pathophysiology Area (B.I.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,IIS-Fundación Jiménez Díaz University Hospital, Madrid, Spain (B.I.).,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
| | - Valentín Fuster
- Vascular Pathophysiology Area (K.T., M.R., R.S.-D., V.F., P.M., F.S.-M.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, NY (V.F.)
| | - José Martínez-González
- Instituto de Investigaciones Biomédicas de Barcelona, IIB-Sant Pau, Spain (J.M.-G.).,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
| | - Pilar Martín
- Vascular Pathophysiology Area (K.T., M.R., R.S.-D., V.F., P.M., F.S.-M.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
| | - Francisco Sánchez-Madrid
- Vascular Pathophysiology Area (K.T., M.R., R.S.-D., V.F., P.M., F.S.-M.), Centro Nacional de Investigaciones Cardiovasculares Carlos III, Madrid, Spain.,Department of Immunology (H.d.L.F., J.L.A.-L., A.V., F.S.-M.), Instituto de Investigación Sanitaria Hospital de la Princesa, IIS-IP, Madrid, Spain.,CIBER de Enfermedades Cardiovasculares, Madrid, Spain (H.d.L.F., R.S.-D., C.R., J.V., B.I., J.M.-G, P.M., F.S.-M.)
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Itabe H, Kato R, Sawada N, Obama T, Yamamoto M. The Significance of Oxidized Low-Density Lipoprotein in Body Fluids as a Marker Related to Diseased Conditions. Curr Med Chem 2019. [PMID: 29521196 DOI: 10.2174/0929867325666180307114855] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Oxidatively modified low-density lipoprotein (oxLDL) is known to be involved in various diseases, including cardiovascular diseases. The presence of oxLDL in the human circulatory system and in atherosclerotic lesions has been demonstrated using monoclonal antibodies. Studies have shown the significance of circulating oxLDL in various systemic diseases, including acute myocardial infarction and diabetic mellitus. Several different enzyme-linked immunosorbent assay (ELISA) procedures to measure oxLDL were utilized. Evidence has been accumulating that reveals changes in oxLDL levels under certain pathological conditions. Since oxLDL concentration tends to correlate with low-density lipoprotein (LDL)-cholesterol, the ratio of ox-LDL and LDL rather than oxLDL concentration alone has also been focused. In addition to circulating plasma, LDL and oxLDL are found in gingival crevicular fluid (GCF), where the ratio of oxLDL to LDL in GCF is much higher than in plasma. LDL and oxLDL levels in GCF show an increase in diabetic patients and periodontal patients, suggesting that GCF might be useful in examining systemic conditions. GCF oxLDL increased when the teeth were affected by periodontitis. It is likely that oxLDL levels in plasma and GCF could reflect oxidative stress and transfer efficacy in the circulatory system.
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Affiliation(s)
- Hiroyuki Itabe
- Division of Biological Chemistry, Department of Molecular Biology, Showa University School of Pharmacy, Tokyo, Japan
| | - Rina Kato
- Division of Biological Chemistry, Department of Molecular Biology, Showa University School of Pharmacy, Tokyo, Japan
| | - Naoko Sawada
- Division of Biological Chemistry, Department of Molecular Biology, Showa University School of Pharmacy, Tokyo, Japan
| | - Takashi Obama
- Division of Biological Chemistry, Department of Molecular Biology, Showa University School of Pharmacy, Tokyo, Japan
| | - Matsuo Yamamoto
- Department of Periodontology, Showa University School of Dentistry, Tokyo, Japan
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29
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Raniolo S, Croce S, Thomsen RP, Okholm AH, Unida V, Iacovelli F, Manetto A, Kjems J, Desideri A, Biocca S. Cellular uptake of covalent and non-covalent DNA nanostructures with different sizes and geometries. NANOSCALE 2019; 11:10808-10818. [PMID: 31134260 DOI: 10.1039/c9nr02006c] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
DNA nanostructures with different sizes and shapes, assembled through either covalent or non-covalent bonds, namely tetrahedral and octahedral nanocages, rod-shaped chainmails, square box and rectangular DNA origami structures, were compared for their stability in serum, cell surface binding, internalization efficiency, and intracellular degradation rate. For cell internalization a specific cell system, highly expressing the scavenger receptor LOX-1 was used. The results indicate that LOX-1 binds and internalizes a broad family of DNA structures of different sizes that, however, have a different fate and lifetime inside the cells. Covalently linked tetrahedra, octahedra or chainmails are intact inside cells for up to 18 hours whilst the same DNA nanostructures without covalent bonds along with square box and rectangular origami are rapidly degraded. These data suggest that non-covalently linked structures may be useful for fast drug release whilst the covalently-linked structures could be appropriate vehicles for slow release of molecules.
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Affiliation(s)
- Sofia Raniolo
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier 1, 00133, Roma, Italy.
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30
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DOPG small unilamellar vesicles function as nano-carriers targeting the clustered lectin-like oxidized LDL receptor (LOX-1) on the cell surface. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2019.03.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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31
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Çoner A, Aydınalp A, Müderrisoğlu H. Evaluation of hs-CRP and sLOX-1 Levels in Moderate-to-High Risk Acute Coronary Syndromes. Endocr Metab Immune Disord Drug Targets 2019; 20:96-103. [PMID: 30961517 DOI: 10.2174/1871530319666190408145905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 03/02/2019] [Accepted: 03/05/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVE Risk stratification and prompt treatment are essential for the management of acute coronary syndromes (ACS) and prediction of future prognosis. Subclinical vascular inflammation and novel biomarkers play an important role in the clinical evaluation of ACS patients. METHODS We enrolled patients who were admitted to emergency service with unstable angina or non- ST segment elevated ACS (NSTE-ACS) in the study population. Coronary artery disease (CAD) complexity was determined via evaluation of angiographical views and peripheral venous blood samples were collected to measure highly sensitive C-reactive protein (hs-CRP) and soluble form of Lectin-like OxLDL receptor-1 (sLOX-1) levels. RESULTS A total of 40 patients were enrolled in the study population, mean age was 65.1±13.8 years and male gender percentage was 52.5%. Twenty-nine of patients had NSTE-ACS and 11 patients had unstable angina presentation. The modified Gensini scores were higher for patients with elevated hs- CRP and sLOX-1 levels. CONCLUSION Vascular inflammation displays the onset of ACS and it is related to more complex CAD in these patients. An increase in sLOX-1 expression is closely related to anatomical complexity of CAD in ACS.
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Affiliation(s)
- Ali Çoner
- Department of Cardiology, Başkent University Hospital Alanya Application and Research Center, Alanya/Antalya, Turkey
| | - Alp Aydınalp
- Department of Cardiology, Başkent University Faculty of Medicine, Ankara, Turkey
| | - Haldun Müderrisoğlu
- Department of Cardiology, Başkent University Faculty of Medicine, Ankara, Turkey
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Takemura Y, Okamoto M, Hasegawa M, Hatanaka K, Kubota S. Protamine may have anti-atherogenic potential by inhibiting the binding of oxidized-low density lipoprotein to LOX-1. Biosci Biotechnol Biochem 2019; 83:1094-1101. [PMID: 30871430 DOI: 10.1080/09168451.2019.1588096] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Oxidized low-density lipoprotein (ox-LDL) leads to atherosclerosis via lectin-like oxidized lipoprotein receptor-1 (LOX-1), one of the major receptor for ox-LDL. Inhibition of the binding of ox-LDL to LOX-1 decreases the proinflammatory and atherosclerotic events. The aim of the present study was to investigate whether protamine, a polybasic nuclear protein, interferes the binding of ox-LDL to LOX-1. Using sandwich ELISA with newly generated antibody, we measured the blocking effect of protamine on the binding of ox-LDL to LOX-1. Protamine dose-dependently inhibited the binding of ox-LDL to LOX-1. DiI-labeled ox-LDL uptake assay in two types of cultured human endothelial cells was performed with fluorescence microplate reader. Activation of extracellular-signal-regulated kinase (ERK)1/2 by ox-LDL was analyzed by immunoblotting. We found that protamine suppressed uptake of ox-LDL in endothelial cells and inhibited ERK1/2 activation by ox-LDL. These results suggest that protamine may possess anti-atherogenic potential by inhibiting ox-LDL binding to LOX-1 through electrostatic interactions.
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Affiliation(s)
- Yukitoshi Takemura
- a Institute of Industrial Science , The University of Tokyo , Tokyo , Japan.,b Department of Pharmaceutical Sciences , Teikyo Heisei University , Tokyo , Japan
| | - Masaki Okamoto
- b Department of Pharmaceutical Sciences , Teikyo Heisei University , Tokyo , Japan
| | - Makoto Hasegawa
- b Department of Pharmaceutical Sciences , Teikyo Heisei University , Tokyo , Japan
| | - Kenichi Hatanaka
- a Institute of Industrial Science , The University of Tokyo , Tokyo , Japan
| | - Shunichiro Kubota
- b Department of Pharmaceutical Sciences , Teikyo Heisei University , Tokyo , Japan.,c Department of Life Sciences , Graduate School of Arts and Sciences, The University of Tokyo , Tokyo , Japan
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Kumari S, Achazi K, Dey P, Haag R, Dernedde J. Design and Synthesis of PEG-Oligoglycerol Sulfates as Multivalent Inhibitors for the Scavenger Receptor LOX-1. Biomacromolecules 2019; 20:1157-1166. [PMID: 30642176 DOI: 10.1021/acs.biomac.8b01416] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) is a cell surface scavenger receptor. The protein is involved in binding and internalization of oxidized low-density lipoprotein (oxLDL), which leads under pathophysiological circumstances to plaque formation in arteries and initiation of atherosclerosis. A structural feature of LOX-1 relevant to oxLDL binding is the "basic spine" motif consisting of linearly aligned arginine residues stretched over the dimer surface. Inhibition of LOX-1 can be done by blocking these positively charged motifs. Here we report on the design, synthesis, and evaluation of a series of novel LOX-1 inhibitors having different numbers of sulfates and polyethylene glycerol (PEG) spacer. Two molecules, compounds 6b and 6d, showed binding affinity in the low nM range, i.e. 45.8 and 47.4 nM, respectively. The in vitro biological studies reveal that these molecules were also able to block the interaction of LOX-1 with its cognate ligands oxLDL, aged RBC, and bacteria.
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Affiliation(s)
- Shalini Kumari
- Institute for Chemistry and Biochemistry, Freie Universität Berlin , Takustr. 3 , 14195 Berlin , Germany
| | - Katharina Achazi
- Institute for Chemistry and Biochemistry, Freie Universität Berlin , Takustr. 3 , 14195 Berlin , Germany
| | - Pradip Dey
- Institute for Chemistry and Biochemistry, Freie Universität Berlin , Takustr. 3 , 14195 Berlin , Germany
| | - Rainer Haag
- Institute for Chemistry and Biochemistry, Freie Universität Berlin , Takustr. 3 , 14195 Berlin , Germany
| | - Jens Dernedde
- Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Charité-Universitätsmedizin Berlin , Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Augustenburger Platz 1 , 13353 Berlin , Germany
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Raniolo S, Vindigni G, Unida V, Ottaviani A, Romano E, Desideri A, Biocca S. Entry, fate and degradation of DNA nanocages in mammalian cells: a matter of receptors. NANOSCALE 2018; 10:12078-12086. [PMID: 29911715 DOI: 10.1039/c8nr02411a] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
DNA has been used to build nanostructures with potential biomedical applications. However, their use is limited by the lack of information on the mechanism of entry, intracellular fate and degradation rate of nanostructures inside cells. We generated octahedral DNA nanocages functionalized with folic acid and investigated the cellular uptake mediated by two distinctive internalization pathways, using two cellular systems expressing the oxidized low-density lipoprotein receptor-1 (LOX-1) and the α isoform of the folate receptor (αFR), respectively. Here, we report that DNA nanocages are very efficiently and selectively internalized by both receptors with an efficiency at least 30 times higher than that observed in cells not expressing the receptors. When internalized by LOX-1, nanocages traffic to lysosomes within 4 hours and are rapidly degraded. When the uptake is mediated by αFR, DNA nanocages are highly stable (>48 hours) and accumulate inside cells in a time-dependent way. These data demonstrate that the selection of the cellular receptor is crucial for targeting specific sub-cellular compartments and for modulating the DNA nanocage intracellular half-life, indicating that vitamin-mediated uptake may constitute a protected pathway for intracellular drug delivery.
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Affiliation(s)
- Sofia Raniolo
- Department of Systems Medicine, University of Rome Tor Vergata, Via Montpellier 1, 00133, Rome, Italy.
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Abstract
Esophageal cancer-related gene 4 (Ecrg4) encodes a hormone-like peptide that is believed to be involved in a variety of physiological phenomena, including tumour suppression. Recent progress in the study of Ecrg4 has shown that Ecrg4 is a proinflammatory factor and induces the expression of several cytokines and chemokines in macrophages/microglia. However, the detailed molecular mechanisms of Ecrg4 signalling, especially the Ecrg4 receptors, remain poorly understood. Here, using retrovirus-mediated expression cloning, we identified lectin-like oxidised low-density lipoprotein receptor-1 (LOX-1) as a membrane protein that binds amino acid residues 71–132 of Ecrg4 (Ecrg4(71–132)). Moreover, in addition to LOX-1, several scavenger receptors, such as Scarf1, Cd36 and Stabilin-1, facilitated the efficient internalisation of Ecrg4(71–132) into cells. A broad competitive inhibitor of scavenger receptors, polyinosinic acid, reduced both the binding of Ecrg4(71–132) and the activation of NF-κB in microglia. This activation was dependent on MyD88, an adaptor protein that recruits signalling proteins to Toll-like receptors (TLRs), with the consequent induction of various immune responses. These data suggest that multiple scavenger receptors recognise Ecrg4(71–132) and transduce its signals, together with TLRs, in microglia.
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Foss CA, Sanchez-Bautista J, Jain SK. Imaging Macrophage-associated Inflammation. Semin Nucl Med 2018; 48:242-245. [PMID: 29626941 DOI: 10.1053/j.semnuclmed.2017.12.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Macrophages belong to the mononuclear phagocyte system comprising closely related cells of bone marrow origin. Activated macrophages are critical in several diseases such as tuberculosis, sarcoidosis, Crohn's disease, and atherosclerosis. Noninvasive imaging techniques that can specifically image activated macrophages could therefore help in differentiating various forms of inflammatory diseases and to monitor therapeutic responses.
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Affiliation(s)
- Catherine A Foss
- Russell H. Morgan Department of Radiology and Radiological Sciences, Johns Hopkins University School of Medicine, Baltimore, MD; Center for Infection and Inflammation Imaging Research, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Julian Sanchez-Bautista
- Center for Infection and Inflammation Imaging Research, Johns Hopkins University School of Medicine, Baltimore, MD; Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Sanjay K Jain
- Center for Infection and Inflammation Imaging Research, Johns Hopkins University School of Medicine, Baltimore, MD; Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD.
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Murdocca M, Mango R, Pucci S, Biocca S, Testa B, Capuano R, Paolesse R, Sanchez M, Orlandi A, di Natale C, Novelli G, Sangiuolo F. The lectin-like oxidized LDL receptor-1: a new potential molecular target in colorectal cancer. Oncotarget 2018; 7:14765-80. [PMID: 26895376 PMCID: PMC4924750 DOI: 10.18632/oncotarget.7430] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Accepted: 01/29/2016] [Indexed: 01/01/2023] Open
Abstract
The identification of new biomarkers and targets for tailored therapy in human colorectal cancer (CRC) onset and progression is an interesting challenge. CRC tissue produces an excess of ox-LDL, suggesting a close correlation between lipid dysfunction and malignant transformation. Lectin-like oxidized LDL receptor-1 (LOX-1) is involved in several mechanisms closely linked to tumorigenesis. Here we report a tumor specific LOX-1 overexpression in human colon cancers: LOX-1 results strongly increased in the 72% of carcinomas (P<0.001), and strongly overexpressed in 90% of highly aggressive and metastatic tumours (P<0.001), as compared to normal mucosa. Moreover LOX-1 results modulated since the early stage of the disease (adenomas vs normal mucosa; P<0.001) suggesting an involvement in tumor insurgence and progression. The in vitro knockdown of LOX-1 in DLD-1 and HCT-8 colon cancer cells by siRNA and anti-LOX-1 antibody triggers to an impaired proliferation rate and affects the maintenance of cell growth and tumorigenicity. The wound-healing assay reveals an evident impairment in closing the scratch. Lastly knockdown of LOX-1 delineates a specific pattern of volatile compounds characterized by the presence of a butyrate derivative, suggesting a potential role of LOX-1 in tumor-specific epigenetic regulation in neoplastic cells. The role of LOX-1 as a novel biomarker and molecular target represents a concrete opportunity to improve current therapeutic strategies for CRC. In addition, the innovative application of a technology focused to the identification of LOX-1 driven volatiles specific to colorectal cancer provides a promising diagnostic tool for CRC screening and for monitoring the response to therapy.
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Affiliation(s)
- Michela Murdocca
- Department of Biomedicine and Prevention, Tor Vergata University, Rome, Italy
| | - Ruggiero Mango
- Department of Emergency and Critical Care, Section of Cardiology, Policlinic of Tor Vergata, Rome, Italy
| | - Sabina Pucci
- Department of Biomedicine and Prevention, Tor Vergata University, Rome, Italy
| | - Silvia Biocca
- Department of Systems Medicine, Tor Vergata University, Rome, Italy
| | - Barbara Testa
- Department of Biomedicine and Prevention, Tor Vergata University, Rome, Italy
| | - Rosamaria Capuano
- Department of Electronic Engineering, Tor Vergata University, Rome, Italy
| | - Roberto Paolesse
- Department of Chemical Science and Technology, Tor Vergata University, Rome, Italy
| | - Massimo Sanchez
- Department of Cell Biology and Neurosciences, Istituto Superiore di Sanità, Rome, Italy
| | - Augusto Orlandi
- Department of Biomedicine and Prevention, Tor Vergata University, Rome, Italy
| | - Corrado di Natale
- Department of Electronic Engineering, Tor Vergata University, Rome, Italy
| | - Giuseppe Novelli
- Department of Biomedicine and Prevention, Tor Vergata University, Rome, Italy
| | - Federica Sangiuolo
- Department of Biomedicine and Prevention, Tor Vergata University, Rome, Italy
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PRR Function of Innate Immune Receptors in Recognition of Bacteria or Bacterial Ligands. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1112:255-280. [DOI: 10.1007/978-981-13-3065-0_18] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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39
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Abstract
Extracellular heat shock proteins (HSP) play important roles in cell signaling and immunity. Many of these effects are mediated by surface receptors expressed on a wide range of cell types. We have investigated the nature of such proteins by cloning candidate receptors into cells (CHO-K1) with the rare property of being null for HSP binding. Using this approach we have discovered that Hsp70 binds avidly to at least two classes of receptors including: (1) c-type lectin receptors (CLR) and (2) scavenger receptors (SR). However, the structural nature of the receptor-ligand interactions is not clear at this time. Hsp70 can bind to LOX-1 (a member of both the CLR and SR), with the c-type lectin binding domain (CTLD) as well as the SR family members SREC-I and FEEL-1/CLEVER-1/STABILIN-1, which by contrast have arrays of EGF-like repeats in their extracellular domains. In this chapter we will discuss: (1) methods for discovery of HSP receptors, (2) approaches to the study of individual receptors in cells that contain multiple such receptors, and (3) methods for investigating HSP receptor function in vivo.
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40
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Hofmann A, Brunssen C, Morawietz H. Contribution of lectin-like oxidized low-density lipoprotein receptor-1 and LOX-1 modulating compounds to vascular diseases. Vascul Pharmacol 2017; 107:S1537-1891(17)30171-4. [PMID: 29056472 DOI: 10.1016/j.vph.2017.10.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 09/29/2017] [Accepted: 10/11/2017] [Indexed: 12/31/2022]
Abstract
The lectin-like oxidized low-density lipoprotein receptor-1 (LOX-1) is the major receptor for binding and uptake of oxidized low-density lipoprotein (oxLDL) in endothelial cells. LOX-1 is also expressed in macrophages, smooth muscle cells and platelets. Following internalization of oxLDL, LOX-1 initiates a vicious cycle from activation of pro-inflammatory signaling pathways, thus promoting an increased reactive oxygen species formation and secretion of pro-inflammatory cytokines. LOX-1 plays a pivotal role in the development of endothelial dysfunction, foam cell and advanced lesions formation as well as in myocardial ischemia. Furthermore, it is known that LOX-1 plays a pivotal role in mitochondrial DNA damage, vascular cell apoptosis, and autophagy. A large number of studies provide evidence of a LOX-1's role in endothelial dysfunction, hypertension, diabetes, and obesity. In addition, novel insights into LOX-1 ligands and the activated signaling pathways have been gained. Recent studies have shown an interaction of LOX-1 with microRNA's, thus providing novel tools to regulate LOX-1 function. Because LOX-1 is increased in atherosclerotic plaques and contributes to endothelial dysfunction, several compounds were tested in vivo and in vitro to modulate the LOX-1 expression in therapeutic approaches.
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Affiliation(s)
- Anja Hofmann
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital and Medical Faculty Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany
| | - Coy Brunssen
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital and Medical Faculty Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany
| | - Henning Morawietz
- Division of Vascular Endothelium and Microcirculation, Department of Medicine III, University Hospital and Medical Faculty Carl Gustav Carus Dresden, Technische Universität Dresden, Dresden, Germany.
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41
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Arjuman A, Chandra NC. LOX-1: A potential target for therapy in atherosclerosis; an in vitro study. Int J Biochem Cell Biol 2017; 91:65-80. [DOI: 10.1016/j.biocel.2017.08.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Revised: 08/21/2017] [Accepted: 08/23/2017] [Indexed: 01/16/2023]
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42
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Iacovelli F, Tucci FG, Macari G, Falconi M. Multiple molecular dynamics simulations of human LOX-1 and Trp150Ala mutant reveal the structural determinants causing the full deactivation of the receptor. Proteins 2017; 85:1902-1912. [DOI: 10.1002/prot.25344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 06/21/2017] [Accepted: 06/23/2017] [Indexed: 11/06/2022]
Affiliation(s)
| | | | - Gabriele Macari
- Department of Biology; University of Rome “Tor Vergata”; Rome Italy
| | - Mattia Falconi
- Department of Biology; University of Rome “Tor Vergata”; Rome Italy
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43
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Jouy F, Lohmann N, Wandel E, Ruiz-Gómez G, Pisabarro MT, Beck-Sickinger AG, Schnabelrauch M, Möller S, Simon JC, Kalkhof S, von Bergen M, Franz S. Sulfated hyaluronan attenuates inflammatory signaling pathways in macrophages involving induction of antioxidants. Proteomics 2017; 17:e1700082. [PMID: 28337837 DOI: 10.1002/pmic.201700082] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 03/22/2017] [Indexed: 01/08/2023]
Abstract
It is well recognized that high molecular weight hyaluronan (H-HA) exerts potent anti-inflammatory effects while its fragmentation into low molecular weight HA (L-HA) is discussed to promote inflammation. Chemical modification of HA with sulfate groups has been shown to foster its anti-inflammatory activity which seems to be maintained in sulfated low molecular weight HA derivatives (sL-HA). However, the molecular mechanisms by which sL-HA produces its anti-inflammatory activity are not understood. In this study, we used global quantitative proteomics combined with targeted analysis of key proteins to characterize the effect of sL-HA on fully differentiated human inflammatory macrophages (iMФ). Culture of iMФ with sL-HA did not affect cell viability but resulted in a reduced pro-inflammatory cytokine response of iMФ after activation indicating a profound counter-regulation of their initial inflammatory phenotype. Rapid internalization of sL-HA involving CD44 and scavenger receptors was observed. Furthermore, an upregulation of the antioxidants SOD2 and SOD3 was found while no oxidative stress was induced. Consequently, activity of transcription factors for inflammatory gene expression was downregulated in iMФ with sL-HA after activation whereas anti-inflammatory proteins were induced. This study proves anti-inflammatory properties of sL-HA and provides information on its regulatory mode of action on iMФ.
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Affiliation(s)
- Florent Jouy
- Department of Molecular Systems Biology, UFZ, Helmholtz-Centre for Environmental Research, Leipzig, Germany
| | - Nadine Lohmann
- Department of Dermatology, Venerology and Allergology, Leipzig University, Leipzig, Germany
| | - Elke Wandel
- Department of Dermatology, Venerology and Allergology, Leipzig University, Leipzig, Germany
| | | | | | | | | | | | - Jan C Simon
- Department of Dermatology, Venerology and Allergology, Leipzig University, Leipzig, Germany
| | - Stefan Kalkhof
- Department of Molecular Systems Biology, UFZ, Helmholtz-Centre for Environmental Research, Leipzig, Germany
- Department of Bioanalytics, University of Applied Sciences and Arts of Coburg, Coburg, Germany
| | - Martin von Bergen
- Department of Molecular Systems Biology, UFZ, Helmholtz-Centre for Environmental Research, Leipzig, Germany
- Department of Chemistry and Bioscience, Aalborg University, Aalborg, Denmark
- Institute of Biochemistry, Faculty of Biosciences, Pharmacy and Psychology, University of Leipzig, Leipzig, Germany
| | - Sandra Franz
- Department of Dermatology, Venerology and Allergology, Leipzig University, Leipzig, Germany
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Li J, Xiu Z, Wang R, Yu C, Chi Y, Qin J, Fu C, Matsuura E, Liu Q. The lipid moiety 7-ketocholesteryl-9-carboxynonanoate mediates binding interaction of oxLDL to LOX-1 and upregulates ABCA1 expression through PPARγ. Life Sci 2017; 177:27-40. [DOI: 10.1016/j.lfs.2017.03.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 03/18/2017] [Accepted: 03/31/2017] [Indexed: 12/20/2022]
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45
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Gentile F, Arcaro A, Pizzimenti S, Daga M, Cetrangolo GP, Dianzani C, Lepore A, Graf M, Ames PRJ, Barrera G. DNA damage by lipid peroxidation products: implications in cancer, inflammation and autoimmunity. AIMS GENETICS 2017; 4:103-137. [PMID: 31435505 PMCID: PMC6690246 DOI: 10.3934/genet.2017.2.103] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 04/12/2017] [Indexed: 12/19/2022]
Abstract
Oxidative stress and lipid peroxidation (LPO) induced by inflammation, excess metal storage and excess caloric intake cause generalized DNA damage, producing genotoxic and mutagenic effects. The consequent deregulation of cell homeostasis is implicated in the pathogenesis of a number of malignancies and degenerative diseases. Reactive aldehydes produced by LPO, such as malondialdehyde, acrolein, crotonaldehyde and 4-hydroxy-2-nonenal, react with DNA bases, generating promutagenic exocyclic DNA adducts, which likely contribute to the mutagenic and carcinogenic effects associated with oxidative stress-induced LPO. However, reactive aldehydes, when added to tumor cells, can exert an anticancerous effect. They act, analogously to other chemotherapeutic drugs, by forming DNA adducts and, in this way, they drive the tumor cells toward apoptosis. The aldehyde-DNA adducts, which can be observed during inflammation, play an important role by inducing epigenetic changes which, in turn, can modulate the inflammatory process. The pathogenic role of the adducts formed by the products of LPO with biological macromolecules in the breaking of immunological tolerance to self antigens and in the development of autoimmunity has been supported by a wealth of evidence. The instrumental role of the adducts of reactive LPO products with self protein antigens in the sensitization of autoreactive cells to the respective unmodified proteins and in the intermolecular spreading of the autoimmune responses to aldehyde-modified and native DNA is well documented. In contrast, further investigation is required in order to establish whether the formation of adducts of LPO products with DNA might incite substantial immune responsivity and might be instrumental for the spreading of the immunological responses from aldehyde-modified DNA to native DNA and similarly modified, unmodified and/or structurally analogous self protein antigens, thus leading to autoimmunity.
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Affiliation(s)
- Fabrizio Gentile
- Department of Medicine and Health Sciences “V. Tiberio”, University of Molise, Campobasso, Italy
| | - Alessia Arcaro
- Department of Medicine and Health Sciences “V. Tiberio”, University of Molise, Campobasso, Italy
| | - Stefania Pizzimenti
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | - Martina Daga
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
| | | | - Chiara Dianzani
- Department of Drug Science and Technology, University of Torino, Torino, Italy
| | - Alessio Lepore
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | - Maria Graf
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Naples, Italy
| | - Paul R. J. Ames
- CEDOC, NOVA Medical School, Universidade NOVA de Lisboa, Lisboa, Portugal, and Department of Haematology, Dumfries Royal Infirmary, Dumfries, Scotland, UK
| | - Giuseppina Barrera
- Department of Clinical and Biological Sciences, University of Torino, Torino, Italy
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46
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Chistiakov DA, Melnichenko AA, Orekhov AN, Bobryshev YV. How do macrophages sense modified low-density lipoproteins? Int J Cardiol 2017; 230:232-240. [DOI: 10.1016/j.ijcard.2016.12.164] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Revised: 12/19/2016] [Accepted: 12/25/2016] [Indexed: 01/18/2023]
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47
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Tiwari A, Avashthi H, Jha R, Srivastava A, Kumar Garg V, Wasudev Ramteke P, Kumar A. Insights using the molecular model of Lipoxygenase from Finger millet (Eleusine coracana (L.)). Bioinformation 2017; 12:156-164. [PMID: 28149050 PMCID: PMC5267959 DOI: 10.6026/97320630012156] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2016] [Revised: 05/17/2016] [Accepted: 05/18/2016] [Indexed: 11/23/2022] Open
Abstract
Lipoxygenase-1 (LOX-1) protein provides defense against pests and pathogens and its presence have been positively correlated with plant
resistance against pathogens. Linoleate is a known substrate of lipoxygenase and it induces necrosis leading to the accumulation of
isoflavonoid phytoalexins in plant leaves. Therefore, it is of interest to study the structural features of LOX-1 from Finger millet. However,
the structure ofLOX-1 from Finger millet is not yet known. A homology model of LOX-1 from Finger millet is described. Domain
architecture study suggested the presence of two domains namely PLAT (Phospho Lipid Acyl Transferase) and lipoxygenase. Molecular
docking models of linoleate with lipoxygenase from finger millet, rice and sorghum are reported. The features of docked models showed
that finger millet have higher pathogen resistance in comparison to other cereal crops. This data is useful for the molecular cloning of fulllength
LOX-1 gene for validating its role in improving plant defense against pathogen infection and for various other biological processes.
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Affiliation(s)
- Apoorv Tiwari
- Department of Molecular Biology & Genetic Engineering, CBSH, G. B. Pant University of Agriculture & Technology, Pantnagar-263145,Uttarakhand, Bharat (India).,Department of Computational Biology & Bioinformatics, JSBB, Sam Higginbottom Institute of Agriculture,Technology and Sciences, Allahabad-211007, Uttar Pradesh, Bharat (India)
| | - Himanshu Avashthi
- Department of Molecular Biology & Genetic Engineering, CBSH, G. B. Pant University of Agriculture & Technology, Pantnagar-263145,Uttarakhand, Bharat (India).,Department of Computational Biology & Bioinformatics, JSBB, Sam Higginbottom Institute of Agriculture,Technology and Sciences, Allahabad-211007, Uttar Pradesh, Bharat (India)
| | - Richa Jha
- Uttaranchal Institute of Technology, Uttaranchal University, Arcadia Grant, Dehradun-248007, Uttarakhand Bharat (India)
| | - Ambuj Srivastava
- Department of Biotechnology, Indian Institute of Technology Madras, Chennai-600036, Tamil Nadu, Bharat (India)
| | - Vijay Kumar Garg
- Department of Molecular Biology & Genetic Engineering, CBSH, G. B. Pant University of Agriculture & Technology, Pantnagar-263145,Uttarakhand, Bharat (India).,Department of Computational Biology & Bioinformatics, JSBB, Sam Higginbottom Institute of Agriculture,Technology and Sciences, Allahabad-211007, Uttar Pradesh, Bharat (India)
| | - Pramod Wasudev Ramteke
- Department of Biological Science, School of Basic Science, Sam Higginbottom Institute of Agriculture, Technology and Sciences, Allahabad-211007, Uttar Pradesh, Bharat (India)
| | - Anil Kumar
- Department of Molecular Biology & Genetic Engineering, CBSH, G. B. Pant University of Agriculture & Technology, Pantnagar-263145,Uttarakhand, Bharat (India)
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48
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LOX-1 and Its Splice Variants: A New Challenge for Atherosclerosis and Cancer-Targeted Therapies. Int J Mol Sci 2017; 18:ijms18020290. [PMID: 28146073 PMCID: PMC5343826 DOI: 10.3390/ijms18020290] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 01/15/2017] [Accepted: 01/23/2017] [Indexed: 12/13/2022] Open
Abstract
Alternative splicing (AS) is a process in which precursor messenger RNA (pre-mRNA) splicing sites are differentially selected to diversify the protein isoform population. Changes in AS patterns have an essential role in normal development, differentiation and response to physiological stimuli. It is documented that AS can generate both “risk” and “protective” splice variants that can contribute to the pathogenesis of several diseases including atherosclerosis. The main endothelial receptor for oxidized low-density lipoprotein (ox-LDLs) is LOX-1 receptor protein encoded by the OLR1 gene. When OLR1 undergoes AS events, it generates three variants: OLR1, OLR1D4 and LOXIN. The latter lacks exon 5 and two-thirds of the functional domain. Literature data demonstrate a protective role of LOXIN in pathologies correlated with LOX-1 overexpression such as atherosclerosis and tumors. In this review, we summarize recent developments in understanding of OLR1 AS while also highlighting data warranting further investigation of this process as a novel therapeutic target.
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Johannes L, Wunder C, Shafaq-Zadah M. Glycolipids and Lectins in Endocytic Uptake Processes. J Mol Biol 2016; 428:S0022-2836(16)30453-3. [PMID: 27984039 DOI: 10.1016/j.jmb.2016.10.027] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 10/24/2016] [Accepted: 10/24/2016] [Indexed: 01/04/2023]
Abstract
A host of endocytic processes has been described at the plasma membrane of eukaryotic cells. Their categorization has most commonly referenced cytosolic machinery, of which the clathrin coat has occupied a preponderant position. In what concerns intra-membrane constituents, the focus of interest has been on phosphatidylinositol lipids and their capacity to orchestrate endocytic events on the cytosolic leaflet of the membrane. The contribution of extracellular determinants to the construction of endocytic pits has received much less attention, depite the fact that (glyco)sphingolipids are exoplasmic leaflet fabric of membrane domains, termed rafts, whose contributions to predominantly clathrin-independent internalization processes is well recognized. Furthermore, sugar modifications on extracellular domains of proteins, and sugar-binding proteins, termed lectins, have also been linked to the uptake of endocytic cargoes at the plasma membrane. In this review, we first summarize these contributions by extracellular determinants to the endocytic process. We thus propose a molecular hypothesis - termed the GL-Lect hypothesis - on how GlycoLipids and Lectins drive the formation of compositional nanoenvrionments from which the endocytic uptake of glycosylated cargo proteins is operated via clathrin-independent carriers. Finally, we position this hypothesis within the global context of endocytic pathway proposals that have emerged in recent years.
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Affiliation(s)
- Ludger Johannes
- Institut Curie, PSL Research University, Chemical Biology of Membranes and Therapeutic Delivery unit, INSERM, U 1143, CNRS, UMR 3666, 26 rue d'Ulm, 75248 Paris Cedex 05, France.
| | - Christian Wunder
- Institut Curie, PSL Research University, Chemical Biology of Membranes and Therapeutic Delivery unit, INSERM, U 1143, CNRS, UMR 3666, 26 rue d'Ulm, 75248 Paris Cedex 05, France
| | - Massiullah Shafaq-Zadah
- Institut Curie, PSL Research University, Chemical Biology of Membranes and Therapeutic Delivery unit, INSERM, U 1143, CNRS, UMR 3666, 26 rue d'Ulm, 75248 Paris Cedex 05, France
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Kumano-Kuramochi M, Fujimura T, Komba S, Maeda-Yamamoto M, Machida S. Screening, expression, and characterization of an anti-human oxidized low-density lipoprotein single-chain variable fragment. J Biosci Bioeng 2016; 122:287-93. [DOI: 10.1016/j.jbiosc.2016.02.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 02/15/2016] [Accepted: 02/29/2016] [Indexed: 12/25/2022]
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