1
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Tachibana H, Minoura K, Omachi T, Nagao K, Ichikawa T, Kimura Y, Kono N, Shimanaka Y, Arai H, Ueda K, Kioka N. The plasma membrane of focal adhesions has a high content of cholesterol and phosphatidylcholine with saturated acyl chains. J Cell Sci 2023; 136:jcs260763. [PMID: 37470177 DOI: 10.1242/jcs.260763] [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: 11/02/2022] [Accepted: 07/12/2023] [Indexed: 07/21/2023] Open
Abstract
Cellular functions, such as differentiation and migration, are regulated by the extracellular microenvironment, including the extracellular matrix (ECM). Cells adhere to ECM through focal adhesions (FAs) and sense the surrounding microenvironments. Although FA proteins have been actively investigated, little is known about the lipids in the plasma membrane at FAs. In this study, we examine the lipid composition at FAs with imaging and biochemical approaches. Using the cholesterol-specific probe D4 with total internal reflection fluorescence microscopy and super-resolution microscopy, we show an enrichment of cholesterol at FAs simultaneously with FA assembly. Furthermore, we establish a method to isolate the lipid from FA-rich fractions, and biochemical quantification of the lipids reveals that there is a higher content of cholesterol and phosphatidylcholine with saturated fatty acid chains in the lipids of the FA-rich fraction than in either the plasma membrane fraction or the whole-cell membrane. These results demonstrate that plasma membrane at FAs has a locally distinct lipid composition compared to the bulk plasma membrane.
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Affiliation(s)
- Hiroshi Tachibana
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Kodai Minoura
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Tomohiro Omachi
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Kohjiro Nagao
- Department of Biophysical Chemistry, Kyoto Pharmaceutical University, Yamashina, Kyoto 607-8414, Japan
| | - Takafumi Ichikawa
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Yasuhisa Kimura
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
| | - Nozomu Kono
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Yuta Shimanaka
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Hiroyuki Arai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Kazumitsu Ueda
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo, Kyoto 606-8507, Japan
| | - Noriyuki Kioka
- Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo, Kyoto 606-8502, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo, Kyoto 606-8507, Japan
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2
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Sun LF, Yang YL, Wang MY, Zhao HS, Xiao TX, Li MX, Wang BB, Huang C, Ren PG, Zhang JV. Inhibition of Col6a5 Improve Lipid Metabolism Disorder in Dihydrotestosterone-Induced Hyperandrogenic Mice. Front Cell Dev Biol 2021; 9:669189. [PMID: 34109177 PMCID: PMC8181728 DOI: 10.3389/fcell.2021.669189] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 04/29/2021] [Indexed: 11/24/2022] Open
Abstract
Hyperandrogenism is a key pathological feature of polycystic ovarian syndrome (PCOS). Excess androgen can lead to PCOS-like cell hypertrophy in the ovaries and adipose tissue of rodents. Here, we established a dihydrotestosterone (DHT)-induced hyperandrogenic mouse model to analyze the differences in gene expression and signaling pathways of the ovaries and gonad fat pads of mice treated with or without DHT by RNA microarray analysis. From the results, we focused on the overlapping differentially expressed gene—Col6a5—and the major differentially enriched signaling pathway—lipid metabolism. We employed DHT-induced mouse ovarian stromal cell, adipogenic 3T3-L1 cell and hepatic cell line NCTC1469 models to investigate whether androgens directly mediate lipid accumulation and hypertrophy. We found that DHT increased lipid droplet accumulation in ovarian stromal cells and adipogenic 3T3-L1 cells but not NCTC1469 cells. DHT significantly altered stromal cell cholesterol metabolism and steroidogenesis, as indicated by changes in cholesterol levels and the expression of related genes, but these effects were not observed in 3T3-L1 cells. Moreover, Col6a5 expression was significantly increased in ovaries and gonadal fat pads of DHT-treated mice, and Col6a5 inhibition alleviated DHT-induced excess lipid accumulation and hypertrophy of ovarian stromal cells and adipogenic 3T3-L1 cells, even improved lipid metabolism in overnourished NCTC1469 cells. Our results indicate that Col6a5 plays important roles in the pathogenesis of DHT-induced lipid metabolism disorder and the hypertrophy of ovarian stromal cells and adipocytes.
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Affiliation(s)
- Li-Feng Sun
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Ya-Li Yang
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,Shenzhen College of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen, China
| | - Mei-Yue Wang
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,Department of Clinical Pharmacy and Translational Medicine, School of Pharmacy and Biomedicine, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Hua-Shan Zhao
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,Department of Clinical Pharmacy and Translational Medicine, School of Pharmacy and Biomedicine, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Tian-Xia Xiao
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Meng-Xia Li
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Bao-Bei Wang
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Chen Huang
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,Department of Clinical Pharmacy and Translational Medicine, School of Pharmacy and Biomedicine, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Pei-Gen Ren
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,Department of Clinical Pharmacy and Translational Medicine, School of Pharmacy and Biomedicine, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
| | - Jian V Zhang
- Center for Energy Metabolism and Reproduction, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.,Department of Clinical Pharmacy and Translational Medicine, School of Pharmacy and Biomedicine, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
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3
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Momchilova A, Markovska T, Georgiev G, Pankov S, Staneva G, Petkova D, Krastev P, Pinkas A, Pankov R. Quercetin affects membrane lipids and apoptosis in three-dimensional fibroblast cultures. BIOTECHNOL BIOTEC EQ 2021. [DOI: 10.1080/13102818.2021.1939785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Albena Momchilova
- Department of Lipid-Protein Interactions, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Tania Markovska
- Department of Lipid-Protein Interactions, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Georgi Georgiev
- Department of Cytology, Histology and Embryology, Faculty of Biology, Sofia University, Sofia, Bulgaria
| | - Stefan Pankov
- Department of Lipid-Protein Interactions, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Galya Staneva
- Department of Lipid-Protein Interactions, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Diana Petkova
- Department of Lipid-Protein Interactions, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Sofia, Bulgaria
| | - Plamen Krastev
- Cardiology Clinic, University Hospital “St. Ekaterina”, Sofia, Bulgaria
| | - Adriana Pinkas
- Director STEP/CSTEP, Office of Continuing Education, Suffolk County Community College, Sayville, NY, USA
| | - Roumen Pankov
- Department of Cytology, Histology and Embryology, Faculty of Biology, Sofia University, Sofia, Bulgaria
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4
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Babel L, Kruse L, Bump S, Langhans M, Meckel T. Lipid-rafts remain stable even after ionizing radiation induced disintegration of β1 integrin containing focal adhesions. BMC Res Notes 2017; 10:697. [PMID: 29208031 PMCID: PMC5717827 DOI: 10.1186/s13104-017-3032-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/29/2017] [Indexed: 01/31/2023] Open
Abstract
Objective Adhesion of cells to the extracellular matrix is facilitated by integrin receptors. We recently found that a nanoscale organization of plasma membrane located integrins containing the β1 subunit is responsible for an enhanced radio-resistance in 3D cultured cells over cells grown in 2D. While ionizing radiation is known to have broad effects on the lipid composition of the plasma membrane and their organization in lipid-rafts, it is not clear whether the effects of ionizing radiation on the nanoscale clustering of integrins is lipid-raft dependent. Results Using single molecule microscopy we can show that β1 integrins colocalize with cholesterol in lipid-rafts. Ionizing radiation, as an extrinsic stressor, causes the separation of β1 integrins from cholesterol lipid raft suggesting that the effects of ionizing radiation on the clustering of β1 integrins are lipid-raft independent. Electronic supplementary material The online version of this article (10.1186/s13104-017-3032-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Laura Babel
- Membrane Dynamics, Department of Biology, Technische Universität Darmstadt, Schnittspahnstrasse 3, 64287, Darmstadt, Germany.,GRK 1657, Molecular and Cellular Responses to Ionizing Radiation, Technische Universität Darmstadt, Darmstadt, Germany
| | - Larissa Kruse
- Membrane Dynamics, Department of Biology, Technische Universität Darmstadt, Schnittspahnstrasse 3, 64287, Darmstadt, Germany
| | - Steven Bump
- Membrane Dynamics, Department of Biology, Technische Universität Darmstadt, Schnittspahnstrasse 3, 64287, Darmstadt, Germany
| | - Markus Langhans
- Membrane Dynamics, Department of Biology, Technische Universität Darmstadt, Schnittspahnstrasse 3, 64287, Darmstadt, Germany
| | - Tobias Meckel
- Membrane Dynamics, Department of Biology, Technische Universität Darmstadt, Schnittspahnstrasse 3, 64287, Darmstadt, Germany. .,GRK 1657, Molecular and Cellular Responses to Ionizing Radiation, Technische Universität Darmstadt, Darmstadt, Germany.
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5
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Kim J, Fukuto HS, Brown DA, Bliska JB, London E. Effects of host cell sterol composition upon internalization of Yersinia pseudotuberculosis and clustered β1 integrin. J Biol Chem 2017; 293:1466-1479. [PMID: 29197826 DOI: 10.1074/jbc.m117.811224] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 11/29/2017] [Indexed: 11/06/2022] Open
Abstract
Yersinia pseudotuberculosis is a foodborne pathogenic bacterium that causes acute gastrointestinal illness, but its mechanisms of infection are incompletely described. We examined how host cell sterol composition affected Y. pseudotuberculosis uptake. To do this, we depleted or substituted cholesterol in human MDA-MB-231 epithelial cells with various alternative sterols. Decreasing host cell cholesterol significantly reduced pathogen internalization. When host cell cholesterol was substituted with various sterols, only desmosterol and 7-dehydrocholesterol supported internalization. This specificity was not due to sterol dependence of bacterial attachment to host cells, which was similar with all sterols studied. Because a key step in Y. pseudotuberculosis internalization is interaction of the bacterial adhesins invasin and YadA with host cell β1 integrin, we compared the sterol dependence of wildtype Y. pseudotuberculosis internalization with that of Δinv, ΔyadA, and ΔinvΔyadA mutant strains. YadA deletion decreased bacterial adherence to host cells, whereas invasin deletion had no effect. Nevertheless, host cell sterol substitution had a similar effect on internalization of these bacterial deletion strains as on the wildtype bacteria. The ΔinvΔyadA double mutant adhered least to cells and so was not significantly internalized. The sterol structure dependence of Y. pseudotuberculosis internalization differed from that of endocytosis, as monitored using antibody-clustered β1 integrin and previous studies on other proteins, which had a more permissive sterol dependence. This study suggests that agents could be designed to interfere with internalization of Yersinia without disturbing endocytosis.
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Affiliation(s)
- JiHyun Kim
- From the Departments of Biochemistry and Cell Biology and
| | - Hana S Fukuto
- Molecular Genetics and Microbiology and.,Center for Infectious Diseases, Stony Brook University, Stony Brook, New York 11794
| | | | - James B Bliska
- Molecular Genetics and Microbiology and.,Center for Infectious Diseases, Stony Brook University, Stony Brook, New York 11794
| | - Erwin London
- From the Departments of Biochemistry and Cell Biology and
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6
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Distinct ErbB2 receptor populations differentially interact with beta1 integrin in breast cancer cell models. PLoS One 2017; 12:e0174230. [PMID: 28306722 PMCID: PMC5357064 DOI: 10.1371/journal.pone.0174230] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 03/05/2017] [Indexed: 11/30/2022] Open
Abstract
ErbB2 is a member of the ErbB family of tyrosine kinase receptors that plays a major role in breast cancer progression. Located at the plasma membrane, ErbB2 forms large clusters in spite of the presence of growth factors. Beta1 integrin, membrane receptor of extracellular matrix proteins, regulates adhesion, migration and invasiveness of breast cancer cells. Physical interaction between beta1 integrin and ErbB2 has been suggested although published data are contradictory. The aim of the present work was to study the interaction between ErbB2 and beta1 integrin in different scenarios of expression and activation. We determined that beta1 integrin and ErbB2 colocalization is dependent on the expression level of both receptors exclusively in adherent cells. In suspension cells, lack of focal adhesions leave integrins free to diffuse on the plasma membrane and interact with ErbB2 even at low expression levels of both receptors. In adherent cells, high expression of beta1 integrin leaves unbound receptors outside focal complexes that diffuse within the plasma membrane and interact with ErbB2 membrane domains. Superresolution imaging showed the existence of two distinct populations of ErbB2: a major population located in large clusters and a minor population outside these structures. Upon ErbB2 overexpression, receptors outside large clusters can freely diffuse at the membrane and interact with integrins. These results reveal how expression levels of beta1 integrin and ErbB2 determine their frequency of colocalization and show that extracellular matrix proteins shape membrane clusters distribution, regulating ErbB2 and beta1 integrin activity in breast cancer cells.
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7
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Kalli AC, Rog T, Vattulainen I, Campbell ID, Sansom MSP. The Integrin Receptor in Biologically Relevant Bilayers: Insights from Molecular Dynamics Simulations. J Membr Biol 2016; 250:337-351. [PMID: 27465729 PMCID: PMC5579164 DOI: 10.1007/s00232-016-9908-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Accepted: 05/25/2016] [Indexed: 11/27/2022]
Abstract
Integrins are heterodimeric (αβ) cell surface receptors that are potential therapeutic targets for a number of diseases. Despite the existence of structural data for all parts of integrins, the structure of the complete integrin receptor is still not available. We have used available structural data to construct a model of the complete integrin receptor in complex with talin F2-F3 domain. It has been shown that the interactions of integrins with their lipid environment are crucial for their function but details of the integrin/lipid interactions remain elusive. In this study an integrin/talin complex was inserted in biologically relevant bilayers that resemble the cell plasma membrane containing zwitterionic and charged phospholipids, cholesterol and sphingolipids to study the dynamics of the integrin receptor and its effect on bilayer structure and dynamics. The results of this study demonstrate the dynamic nature of the integrin receptor and suggest that the presence of the integrin receptor alters the lipid organization between the two leaflets of the bilayer. In particular, our results suggest elevated density of cholesterol and of phosphatidylserine lipids around the integrin/talin complex and a slowing down of lipids in an annulus of ~30 Å around the protein due to interactions between the lipids and the integrin/talin F2-F3 complex. This may in part regulate the interactions of integrins with other related proteins or integrin clustering thus facilitating signal transduction across cell membranes.
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Affiliation(s)
- Antreas C Kalli
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK
| | - Tomasz Rog
- Department of Physics, Tampere University of Technology, P.O. Box 692, 33101, Tampere, Finland
| | - Ilpo Vattulainen
- Department of Physics, Tampere University of Technology, P.O. Box 692, 33101, Tampere, Finland
- MEMPHYS - Center for Biomembrane Physics, University of Southern Denmark, 5230, Odense M, Denmark
| | - Iain D Campbell
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK
| | - Mark S P Sansom
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU, UK.
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8
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Momchilova A, Petkova D, Staneva G, Markovska T, Pankov R, Skrobanska R, Nikolova-Karakashian M, Koumanov K. Resveratrol alters the lipid composition, metabolism and peroxide level in senescent rat hepatocytes. Chem Biol Interact 2013; 207:74-80. [PMID: 24183824 DOI: 10.1016/j.cbi.2013.10.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 09/20/2013] [Accepted: 10/18/2013] [Indexed: 01/27/2023]
Abstract
Investigations were performed on the influence of resveratrol on the lipid composition, metabolism, fatty acid and peroxide level in plasma membranes of hepatocytes, isolated from aged rats. Hepatocytes were chosen due to the central role of the liver in lipid metabolism and homeostasis. The obtained results showed that the level of sphingomyelin (SM) and phosphatidylserine (PS) was augmented in plasma membranes of resveratrol-treated senescent hepatocytes. The saturated/unsaturated fatty acids ratio of the two most abundant membrane phospholipids, phosphatidylcholine (PC) and phosphatidylethanolamine (PE), was decreased as a result of resveratrol treatment. The neutral sphingomyelinase was found to be responsible for the increase of SM and the decrease of ceramide in plasma membranes of resveratrol-treated senescent hepatocytes. Using labeled acetate as a precursor of lipid synthesis we demonstrated, that resveratrol treatment resulted in inhibition mainly of phospholipid synthesis, followed by fatty acids synthesis. Resveratrol induced reduction of specific membrane-associated markers of apoptosis such as localization of PS in the external plasma membrane monolayer and ceramide level. Finally, the content of lipid peroxides was investigated, because the unsaturated fatty acids, which were augmented as a result of resveratrol treatment, are an excellent target of oxidative attack. The results showed that the lipid peroxide level was significantly lower, ROS were slightly reduced and GSH was almost unchanged in resveratrol-treated hepatocytes. We suggest, that one possible biochemical mechanism, underlying the reported resveratrol-induced changes, is the partial inactivation of neutral sphingomyelinase, leading to increase of SM, the latter acting as a native membrane antioxidant. In conclusion, our studies indicate that resveratrol treatment induces beneficial alterations in the phospholipid and fatty acid composition, as well as in the ceramide and peroxide content in plasma membranes of senescent hepatocytes. Thus, the presented results imply that resveratrol could improve the functional activity of the membrane lipids in the aged liver by influencing specific membrane parameters, associated with the aging process.
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Affiliation(s)
- Albena Momchilova
- Department of Lipid-Protein Interactions in Biomembranes, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria.
| | - Diana Petkova
- Department of Lipid-Protein Interactions in Biomembranes, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria
| | - Galya Staneva
- Department of Lipid-Protein Interactions in Biomembranes, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria
| | - Tania Markovska
- Department of Lipid-Protein Interactions in Biomembranes, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria
| | - Roumen Pankov
- Department of Cytology, Histology and Embryology, Biological Faculty, Sofia University, 14, Dragan Cankov Str, 1164 Sofia, Bulgaria
| | - Ralica Skrobanska
- Department of Cytology, Histology and Embryology, Biological Faculty, Sofia University, 14, Dragan Cankov Str, 1164 Sofia, Bulgaria
| | | | - Kamen Koumanov
- Department of Lipid-Protein Interactions in Biomembranes, Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. Bl. 21, 1113 Sofia, Bulgaria
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9
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Wydro P, Flasiński M, Broniatowski M. Grazing Incidence X-ray Diffraction and Brewster Angle Microscopy studies on domain formation in phosphatidylethanolamine/cholesterol monolayers imitating the inner layer of human erythrocyte membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1828:1415-23. [DOI: 10.1016/j.bbamem.2013.01.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2012] [Revised: 01/21/2013] [Accepted: 01/30/2013] [Indexed: 11/26/2022]
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10
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Hussain N, Siegel A, Ge Y, Jordan R, Naumann C. Bilayer asymmetry influences integrin sequestering in raft-mimicking lipid mixtures. Biophys J 2013; 104:2212-21. [PMID: 23708361 PMCID: PMC3660629 DOI: 10.1016/j.bpj.2013.04.020] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Revised: 03/15/2013] [Accepted: 04/09/2013] [Indexed: 12/25/2022] Open
Abstract
There is growing recognition that lipid heterogeneities in cellular membranes play an important role in the distribution and functionality of membrane proteins. However, the detection and characterization of such heterogeneities at the cellular level remains challenging. Here we report on the poorly understood relationship between lipid bilayer asymmetry and membrane protein sequestering in raft-mimicking model membrane mixtures using a powerful experimental platform comprised of confocal spectroscopy XY-scan and photon-counting histogram analyses. This experimental approach is utilized to probe the domain-specific sequestering and oligomerization state of αvβ3 and α5β1 integrins in bilayers, which contain coexisting liquid-disordered/liquid-ordered (ld/lo) phase regions exclusively in the top leaflet of the bilayer (bottom leaflet contains ld phase). Comparison with previously reported integrin sequestering data in bilayer-spanning lo-ld phase separations demonstrates that bilayer asymmetry has a profound influence on αvβ3 and α5β1 sequestering behavior. For example, both integrins sequester preferentially to the lo phase in asymmetric bilayers, but to the ld phase in their symmetric counterparts. Furthermore, our data show that bilayer asymmetry significantly influences the role of native ligands in integrin sequestering.
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Affiliation(s)
- Noor F. Hussain
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indiana
| | - Amanda P. Siegel
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indiana
| | - Yifan Ge
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indiana
| | - Rainer Jordan
- Makromolekulare Chemie, Dresden University of Technology, Dresden, Germany
| | - Christoph A. Naumann
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University Indianapolis, Indiana
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11
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Okada Y, Ueyama K, Nishikawa JI, Semma M, Ichikawa A. Effect of 6-O-α-maltosyl-β cyclodextrin and its cholesterol inclusion complex on cellular cholesterol levels and ABCA1 and ABCG1 expression in mouse mastocytoma P-815 cells. Carbohydr Res 2012; 357:68-74. [DOI: 10.1016/j.carres.2012.04.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2012] [Revised: 04/26/2012] [Accepted: 04/29/2012] [Indexed: 01/25/2023]
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12
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Allosteric modulation of beta1 integrin function induces lung tissue repair. Adv Pharmacol Sci 2012; 2012:768720. [PMID: 22505883 PMCID: PMC3299389 DOI: 10.1155/2012/768720] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 10/21/2011] [Accepted: 10/31/2011] [Indexed: 12/04/2022] Open
Abstract
The cellular cytoskeleton, adhesion receptors, extracellular matrix composition, and their spatial distribution are together fundamental in a cell's balanced mechanical sensing of its environment. We show that, in lung injury, extracellular matrix-integrin interactions are altered and this leads to signalling alteration and mechanical missensing. The missensing, secondary to matrix alteration and cell surface receptor alterations, leads to increased cellular stiffness, injury, and death. We have identified a monoclonal antibody against β1 integrin which caused matrix remodelling and enhancement of cell survival. The antibody acts as an allosteric dual agonist/antagonist modulator of β1 integrin. Intriguingly, this antibody reversed both functional and structural tissue injury in an animal model of degenerative disease in lung.
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13
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Siegel A, Kimble-Hill A, Garg S, Jordan R, Naumann C. Native ligands change integrin sequestering but not oligomerization in raft-mimicking lipid mixtures. Biophys J 2011; 101:1642-50. [PMID: 21961590 PMCID: PMC3183796 DOI: 10.1016/j.bpj.2011.08.040] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Revised: 08/17/2011] [Accepted: 08/30/2011] [Indexed: 11/16/2022] Open
Abstract
Distinct lipid environments, including lipid rafts, are increasingly recognized as a crucial factor affecting membrane protein function in plasma membranes. Unfortunately, an understanding of their role in membrane protein activation and oligomerization has remained elusive due to the challenge of characterizing these often small and transient plasma membrane heterogeneities in live cells. To address this difficulty, we present an experimental model membrane platform based on polymer-supported lipid bilayers containing stable raft-mimicking domains (type I) and homogeneous cholesterol-lipid mixtures (type II) into which transmembrane proteins are incorporated (α(v)β(3) and α(5)β(1) integrins). These flexible lipid platforms enable the use of confocal fluorescence spectroscopy, including the photon counting histogram method, in tandem with epifluorescence microscopy to quantitatively probe the effect of the binding of native ligands from the extracellular matrix ligands (vitronectin and fibronectin for α(v)β(3) and α(5)β(1), respectively) on domain-specific protein sequestration and on protein oligomerization state. We found that both α(v)β(3) and α(5)β(1) sequester preferentially to nonraft domains in the absence of extracellular matrix ligands, but upon ligand addition, α(v)β(3) sequesters strongly into raft-like domains and α(5)β(1) loses preference for either raft-like or nonraft-like domains. A corresponding photon counting histogram analysis showed that integrins exist predominantly in a monomeric state. No change was detected in oligomerization state upon ligand binding in either type I or type II bilayers, but a moderate increase in oligomerization state was observed for increasing concentrations of cholesterol. The combined findings suggest a mechanism in which changes in integrin sequestering are caused by ligand-induced changes in integrin conformation and/or dynamics that affect integrin-lipid interactions without altering the integrin oligomerization state.
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Affiliation(s)
- Amanda P. Siegel
- Department of Chemistry and Chemical Biology, Indiana University Purdue University, Indianapolis, Indiana
| | - Ann Kimble-Hill
- Department of Chemistry and Chemical Biology, Indiana University Purdue University, Indianapolis, Indiana
| | - Sumit Garg
- Department of Chemistry and Chemical Biology, Indiana University Purdue University, Indianapolis, Indiana
| | - Rainer Jordan
- Department Chemie, Technische Universität Dresden, Dresden, Germany
| | - Christoph A. Naumann
- Department of Chemistry and Chemical Biology, Indiana University Purdue University, Indianapolis, Indiana
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14
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Armstrong DL, Markovitch O, Zidovetzki R, Lancet D. Replication of simulated prebiotic amphiphile vesicles controlled by experimental lipid physicochemical properties. Phys Biol 2011; 8:066001. [PMID: 21946049 DOI: 10.1088/1478-3975/8/6/066001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We present a new embodiment of the graded autocatalysis replication domain (GARD) for the growth, replication and evolution of lipid vesicles based on a semi-empirical foundation using experimentally measured kinetic values of selected extant lipid species. Extensive simulations using this formalism elucidated the details of the dependence of the replication and properties of the vesicles on the physicochemical properties and concentrations of the lipids, both in the environment and in the vesicle. As expected, the overall concentration and number of amphiphilic components strongly affect average replication time. Furthermore, variations in acyl chain length and unsaturation of vesicles also influence replication rate, as do the relative concentrations of individual lipid types. Understanding of the dependence of replication rates on physicochemical parameters opens a new direction in the study of prebiotic vesicles and lays the groundwork for future studies involving the competition between lipid vesicles for available amphiphilic monomers.
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Affiliation(s)
- Don L Armstrong
- Department of Cell Biology and Neuroscience, University of California, Riverside, USA.
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15
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Structural organization of plasma membrane lipids isolated from cells cultured as a monolayer and in tissue-like conditions. J Colloid Interface Sci 2011; 359:202-9. [PMID: 21507411 DOI: 10.1016/j.jcis.2011.03.085] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2011] [Revised: 03/28/2011] [Accepted: 03/29/2011] [Indexed: 11/20/2022]
Abstract
Complementary biophysical approaches were used to study the structural organization of plasma membrane lipids obtained from fibroblasts cultured as two-dimensional (2D) monolayer and in tissue-like three-dimensional (3D) conditions. Fluorescence microscopy experiments demonstrated different domain patterns for 2D and 3D plasma membrane lipid extracts. ESR demonstrated that 3D lipid extract is characterized with lower order parameter than 2D in the deep hydrophobic core of the lipid bilayer. Higher cholesterol and sphingomyelin content in 3D extract, known to increase the order in the glycerophospholipid matrix, was not able to compensate higher fatty acid polyunsaturation of the phospholipids. The interfacial region of the bilayer was probed by the fluorescent probe Laurdan. A higher general polarization value for 3D extract was measured. It is assigned to the increased content of sphingomyelin, cholesterol, phosphatidylethanolamine and phosphatidylserine in the 3D membranes. These results demonstrate that cells cultured under different conditions exhibit compositional heterogeneity of the constituent lipids which determine different structural organization of the membranes.
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16
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Brouwers JF, Boerke A, Silva PFN, Garcia-Gil N, van Gestel RA, Helms JB, van de Lest CHA, Gadella BM. Mass spectrometric detection of cholesterol oxidation in bovine sperm. Biol Reprod 2011; 85:128-36. [PMID: 21415139 DOI: 10.1095/biolreprod.111.091207] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
Abstract
We report on the presence and formation of cholesterol oxidation products (oxysterols) in bovine sperm. Although cholesterol is the most abundant molecule in the membrane of mammalian cells and is easily oxidized, this is the first report on cholesterol oxidation in sperm membranes as investigated by state-of-the-art liquid chromatographic and mass spectrometric methods. First, oxysterols are already present in fresh semen samples, showing that lipid peroxidation is part of normal sperm physiology. After chromatographic separation (by high-performance liquid chromatography), the detected oxysterol species were identified with atmospheric pressure chemical ionization mass spectrometry in multiple-reaction-monitoring mode that enabled detection in a broad and linear concentration range (0.05-100 pmol for each oxysterol species detected). Second, exposure of living sperm cells to oxidative stress does not result in the same level and composition of oxysterol species compared with oxidative stress imposed on reconstituted vesicles from protein-free sperm lipid extracts. This suggests that living sperm cells protect themselves against elevated oxysterol formation. Third, sperm capacitation induces the formation of oxysterols, and these formed oxysterols are almost completely depleted from the sperm surface by albumin. Fourth, and most importantly, capacitation after freezing/thawing of sperm fails to induce both the formation of oxysterols and the subsequent albumin-dependent depletion of oxysterols from the sperm surface. The possible physiological relevance of capacitation-dependent oxysterol formation and depletion at the sperm surface as well as the omission of this after freezing/thawing semen is discussed.
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Affiliation(s)
- Jos F Brouwers
- Department of Biochemistry and Cell Biology, Faculty of Veterinary Medicine, Utrecht University, Utrecht, The Netherlands
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17
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Brown XQ, Bartolak-Suki E, Williams C, Walker ML, Weaver VM, Wong JY. Effect of substrate stiffness and PDGF on the behavior of vascular smooth muscle cells: implications for atherosclerosis. J Cell Physiol 2010; 225:115-22. [PMID: 20648629 DOI: 10.1002/jcp.22202] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Vascular disease, such as atherosclerosis, is accompanied by changes in the mechanical properties of the vessel wall. Although altered mechanics is thought to contribute to disease progression, the molecular mechanisms whereby vessel wall stiffening could promote vascular occlusive disease remain unclear. It is well known that platelet-derived growth factor (PDGF) is a major stimulus for the abnormal migration and proliferation of vascular smooth muscle cells (VSMCs) and contributes critically to vascular disease. Here we used engineered substrates with tunable mechanical properties to explore the effect of tissue stiffness on PDGF signaling in VSMCs as a potential mechanism whereby vessel wall stiffening could promote vascular disease. We found that substrate stiffness significantly enhanced PDGFR activity and VSMC proliferation. After ligand binding, PDGFR followed distinct routes of activation in cells cultured on stiff versus soft substrates, as demonstrated by differences in its intensity and duration of activation, sensitivity to cholesterol extracting agent, and plasma membrane localization. Our results suggest that stiffening of the vessel wall could actively promote pathogenesis of vascular disease by enhancing PDGFR signaling to drive VSMC growth and survival.
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Affiliation(s)
- Xin Q Brown
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts 02215, USA
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18
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Rojo L, Sjöberg MK, Hernández P, Zambrano C, Maccioni RB. Roles of cholesterol and lipids in the etiopathogenesis of Alzheimer's disease. J Biomed Biotechnol 2010; 2006:73976. [PMID: 17047312 PMCID: PMC1559932 DOI: 10.1155/jbb/2006/73976] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Alzheimer's disease is the principal cause of dementia throughout the world and the fourth cause of death in developed economies.This brain disorder is characterized by the formation of brain protein aggregates, namely, the paired helical filaments and senile plaques. Oxidative stress during life, neuroinflamamtion, and alterations in neuron-glia interaction patterns have been also involved in the etiopathogenesis of this disease. In recent years, cumulative evidence has been gained on the involvement of alteration in neuronal lipoproteins activity, as well as on the role of cholesterol and other lipids in the pathogenesis of this neurodegenerative disorder. In this review, we analyze the links between changes in cholesterol homeostasis, and the changes of lipids of major importance for neuronal activity and Alheimer's disease. The investigation on the fine molecular mechanisms underlying the lipids influence in the etiopathogenesis of Alzheimer's disease may shed light into its treatment and medical management.
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Affiliation(s)
- Leonel Rojo
- Laboratory of Cellular and Molecular Biology and Neurosciences, Millennium Institute for Advanced Studies in
Cell Biology and Biotechnology (CBB), Millennium Building, Las Encinas 3370, Ñuñoa, Santiago, Chile
- Department of Chemistry, Arturo Prat University, avenue Arturo Prat 2120, Iquique, Chile
| | - Marcela K. Sjöberg
- Laboratory of Cellular and Molecular Biology and Neurosciences, Millennium Institute for Advanced Studies in
Cell Biology and Biotechnology (CBB), Millennium Building, Las Encinas 3370, Ñuñoa, Santiago, Chile
- Department of Neurological Sciences, Faculty of Medicine, University of Chile, Salvador 486, 750-0922 Providencia,
Santiago, Chile
| | - Paula Hernández
- Laboratory of Cellular and Molecular Biology and Neurosciences, Millennium Institute for Advanced Studies in
Cell Biology and Biotechnology (CBB), Millennium Building, Las Encinas 3370, Ñuñoa, Santiago, Chile
- Department of Neurological Sciences, Faculty of Medicine, University of Chile, Salvador 486, 750-0922 Providencia,
Santiago, Chile
| | - Cristian Zambrano
- Laboratory of Cellular and Molecular Biology and Neurosciences, Millennium Institute for Advanced Studies in
Cell Biology and Biotechnology (CBB), Millennium Building, Las Encinas 3370, Ñuñoa, Santiago, Chile
- Department of Neurological Sciences, Faculty of Medicine, University of Chile, Salvador 486, 750-0922 Providencia,
Santiago, Chile
| | - Ricardo B. Maccioni
- Laboratory of Cellular and Molecular Biology and Neurosciences, Millennium Institute for Advanced Studies in
Cell Biology and Biotechnology (CBB), Millennium Building, Las Encinas 3370, Ñuñoa, Santiago, Chile
- Department of Neurological Sciences, Faculty of Medicine, University of Chile, Salvador 486, 750-0922 Providencia,
Santiago, Chile
- *Ricardo B. Maccioni:
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19
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Alterations in the content and physiological role of sphingomyelin in plasma membranes of cells cultured in three-dimensional matrix. Mol Cell Biochem 2010; 340:215-22. [DOI: 10.1007/s11010-010-0420-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2009] [Accepted: 02/10/2010] [Indexed: 10/19/2022]
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20
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Ferri N, Roncalli E, Arnaboldi L, Fenu S, Andrukhova O, Aharinejad S, Camera M, Tremoli E, Corsini A. Fibrillar Collagen Inhibits Cholesterol Biosynthesis in Human Aortic Smooth Muscle Cells. Arterioscler Thromb Vasc Biol 2009; 29:1631-7. [DOI: 10.1161/atvbaha.109.187807] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Objective—
Integrin-mediated cell adhesion to type I fibrillar collagen regulates gene and protein expression, whereas little is known of its effect on lipid metabolism. In the present study, we examined the effect of type I fibrillar collagen on cholesterol biosynthesis in human aortic smooth muscle cells (SMCs).
Methods and Results—
SMCs were cultured on either fibrillar or monomer collagen for 48 hours and [
14
C]-acetate incorporation into cholesterol was evaluated. Fibrillar collagen reduced by 72.9±2.6% cholesterol biosynthesis without affecting cellular cholesterol levels. Fibrillar collagen also reduced 3-hydroxy-3-methylglutaryl coenzyme A reductase (HMG-CoA) promoter activity (−72.6±7.3%), mRNA (−58.7±6.4%), protein levels (−35.5±8.5%), and enzyme activity (−37.7±2.2%). Intracellular levels of the active form of sterol regulatory element binding proteins (SREBP) 1a was decreased by 60.7±21.7% in SMCs cultured on fibrillar collagen, whereas SREBP2 was not significantly affected (+12.1±7.1%). The overexpression of the active form of SREBP1a rescued the downregulation of fibrillar collagen on HMG-CoA reductase levels. Blocking antibody to α2 integrin partially reversed the downregulation of HMG-CoA reductase mRNA expression. Finally, fibrillar collagen led to an intracellular accumulation of unprenylated Ras.
Conclusions—
Our study demonstrated that α2β1 integrin interaction with fibrillar collagen affected the expression of HMG-CoA reductase, which led to the inhibition of cholesterol biosynthesis in human SMCs.
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Affiliation(s)
- Nicola Ferri
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Elisa Roncalli
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Lorenzo Arnaboldi
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Simone Fenu
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Olena Andrukhova
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Seyedhossein Aharinejad
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Marina Camera
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Elena Tremoli
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
| | - Alberto Corsini
- From the Department of Pharmacological Sciences (N.F., E.R., L.A., M.C., E.T., A.C.), University of Milan, Italy; Axxam (S.F.), San Raffaele Biomedical Science Park, Milan, Italy; the Department of Anatomy and Cell Biology (O.A., S.A.), Vienna Medical University, Austria; and Monzino Cardiology Center IRCCS (M.C., E.T.), Milan, Italy
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21
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Park EK, Park MJ, Lee SH, Li YC, Kim J, Lee JS, Lee JW, Ye SK, Park JW, Kim CW, Park BK, Kim YN. Cholesterol depletion induces anoikis-like apoptosis via FAK down-regulation and caveolae internalization. J Pathol 2009; 218:337-49. [PMID: 19288501 DOI: 10.1002/path.2531] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Caveolae (lipid rafts), microdomains of the plasma membrane, are known to contain various signalling molecules and consequently are involved in the regulation of many biological functions. To investigate the role of the caveolae in cell survival and adhesion, we disrupted the caveolae by depletion of cholesterol, a major lipid component of the caveolae, with methyl-beta cyclodextrin (MbetaCD) treatment of A431 cells. We found that cholesterol depletion induced an anoikis-like cell death involving actin reorganization, resulting in a decrease in cell spreading and an increase in cell detachment, which was reversed by cholesterol addition. Disruption of caveolae led to the down-regulation of FAK, Src activation, tyrosine phosphorylation of caveolin-1 and mobilization of caveolae markers, GM1 and caveolin-1, from the cell surface to the cytoplasm, which were also recovered by cholesterol addition. The expression of dominant-active FAK was able to delay caveolae internalization and apoptosis and attenuated Akt inactivation by MbetaCD, whereas dominant-negative FAK expression resulted in enhanced apoptosis. Moreover, FAK down-regulation by si-RNA resulted in Akt inactivation and thus increased cell death by MbetaCD treatment. Our results suggest that the cholesterol content and/or surface levels of the caveolae affect the activity of FAK, which in turn regulates caveolae internalization and cell survival.
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Affiliation(s)
- Eun-Kyung Park
- National Cancer Centre, Madu 1-dong, Ilsan-gu Goyang-si, Gyeonggi-do, Korea
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22
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Jordanova A, Stefanova N, Staneva G, Pankov R, Momchilova A, Lalchev Z. Surface Properties and Behavior of Lipid Extracts from Plasma Membranes of Cells Cultured as Monolayer and in Tissue-Like Conditions. Cell Biochem Biophys 2009; 54:47-55. [DOI: 10.1007/s12013-009-9050-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2009] [Accepted: 05/18/2009] [Indexed: 11/29/2022]
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23
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Transmembrane cholesterol migration in planar lipid membranes measured with Vibrio cholerae cytolysin as molecular tool. Biochimie 2009; 91:620-3. [DOI: 10.1016/j.biochi.2009.03.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Accepted: 03/12/2009] [Indexed: 01/12/2023]
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24
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Vassilieva EV, Gerner-Smidt K, Ivanov AI, Nusrat A. Lipid rafts mediate internalization of beta1-integrin in migrating intestinal epithelial cells. Am J Physiol Gastrointest Liver Physiol 2008; 295:G965-76. [PMID: 18755811 PMCID: PMC2584823 DOI: 10.1152/ajpgi.00082.2008] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Intestinal mucosal inflammation is associated with epithelial wounds that rapidly reseal by migration of intestinal epithelial cells (IECs). Cell migration involves cycles of cell-matrix adhesion/deadhesion that is mediated by dynamic turnover (assembly and disassembly) of integrin-based focal adhesions. Integrin endocytosis appears to be critical for deadhesion of motile cells. However, mechanisms of integrin internalization during remodeling of focal adhesions of migrating IECs are not understood. This study was designed to define the endocytic pathway that mediates internalization of beta(1)-integrin in migrating model IECs. We observed that, in SK-CO15 and T84 colonic epithelial cells, beta(1)-integrin is internalized in a dynamin-dependent manner. Pharmacological inhibition of clathrin-mediated endocytosis or macropinocytosis and small-interfering RNA (siRNA)-mediated knock down of clathrin did not prevent beta(1)-integrin internalization. However, beta(1)-integrin internalization was inhibited following cholesterol extraction and after overexpression of lipid raft protein, caveolin-1. Furthermore, internalized beta(1)-integrin colocalized with the lipid rafts marker cholera toxin, and siRNA-mediated knockdown of caveolin-1 and flotillin-1/2 increased beta(1)-integrin endocytosis. Our data suggest that, in migrating IEC, beta(1)-integrin is internalized via a dynamin-dependent lipid raft-mediated pathway. Such endocytosis is likely to be important for disassembly of integrin-based cell-matrix adhesions and therefore in regulating IEC migration and wound closure.
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Affiliation(s)
- Elena V. Vassilieva
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Kirsten Gerner-Smidt
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Andrei I. Ivanov
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
| | - Asma Nusrat
- Epithelial Pathobiology Research Unit, Department of Pathology and Laboratory Medicine, Emory University, Atlanta, Georgia; and Gastroenterology and Hepatology Division, Department of Medicine, The University of Rochester School of Medicine and Dentistry, Rochester, New York
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25
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Krasilnikov OV, Merzlyak PG, Lima VLM, Zitzer AO, Valeva A, Yuldasheva LN. Pore formation by Vibrio cholerae cytolysin requires cholesterol in both monolayers of the target membrane. Biochimie 2007; 89:271-7. [PMID: 17303303 DOI: 10.1016/j.biochi.2006.12.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2006] [Accepted: 12/18/2006] [Indexed: 11/19/2022]
Abstract
Vibrio cholerae cytolysin (VCC) forms oligomeric transmembrane pores in cholesterol-rich membranes. To better understand this process, we used planar bilayer membranes. In symmetric membranes, the rate of the channel formation by VCC has a superlinear dependency on the cholesterol membrane fraction. Thus, more than one cholesterol molecule can facilitate VCC-pore formation. In asymmetric membranes, the rate of pore formation is limited by the leaflet with the lower cholesterol content. Methyl-beta-cyclodextrin, which removes cholesterol from membranes, rapidly inhibits VCC pore formation, even when it is added to the side opposite that of VCC addition. The results suggest that cholesterol in both membrane leaflets aid VCC-pore formation and that either leaflet can function as a kinetic bottleneck with respect to the rate of pore-formation.
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Affiliation(s)
- Oleg V Krasilnikov
- Laboratory of Membrane Biophysics, Department of Biophysics and Radiobiology, Federal University of Pernambuco, Av. prof. Moraes Rego, S/N, 50670-901 Recife, PE, Brazil.
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26
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Pankov R, Markovska T, Antonov P, Ivanova L, Momchilova A. The plasma membrane lipid composition affects fusion between cells and model membranes. Chem Biol Interact 2006; 164:167-73. [PMID: 17098217 DOI: 10.1016/j.cbi.2006.09.010] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2006] [Revised: 09/20/2006] [Accepted: 09/26/2006] [Indexed: 10/23/2022]
Abstract
Investigations were carried out on the effect of plasma membrane lipid modifications on the fusogenic capacity of control and ras-transformed fibroblasts. The plasma membrane lipid composition was modified by treatment of cells with exogenous phospholipases C and D, sphingomyelinase and cyclodextrin. The used enzymes hydrolyzed definite membrane lipids thus inducing specific modifications of the lipid composition while cyclodextrin treatment reduced significantly the level of cholesterol. The cells with modified membranes were used for assessment of their fusogenic capacity with model membranes with a constant lipid composition. Treatment with phospholipases C and D stimulated the fusogenic potential of both cell lines whereas the specific reduction of either sphingomyelin or cholesterol induced the opposite effect. The results showed that all modifications of the plasma membrane lipid composition affected the fusogenic capacity irrespective of the initial differences in the membrane lipid composition of the two cell lines. These results support the notion that the lipid composition plays a significant role in the processes of membrane-membrane fusion. This role could be either direct or through modulation of the activity of specific proteins which regulate membrane fusion.
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Affiliation(s)
- Roumen Pankov
- Department of Cytology, Histology and Embryology, Biological Faculty, Sofia University, Sofia, Bulgaria.
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