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Markowska A, Markowski AR, Jarocka-Karpowicz I. The Importance of 6-Aminohexanoic Acid as a Hydrophobic, Flexible Structural Element. Int J Mol Sci 2021; 22:12122. [PMID: 34830000 PMCID: PMC8618066 DOI: 10.3390/ijms222212122] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 11/02/2021] [Accepted: 11/05/2021] [Indexed: 11/17/2022] Open
Abstract
6-aminohexanoic acid is an ω-amino acid with a hydrophobic, flexible structure. Although the ω-amino acid in question is mainly used clinically as an antifibrinolytic drug, other applications are also interesting and important. This synthetic lysine derivative, without an α-amino group, plays a significant role in chemical synthesis of modified peptides and in the polyamide synthetic fibers (nylon) industry. It is also often used as a linker in various biologically active structures. This review concentrates on the role of 6-aminohexanoic acid in the structure of various molecules.
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Affiliation(s)
- Agnieszka Markowska
- Department of Analytical Chemistry, Medical University of Bialystok, 15-089 Bialystok, Poland;
| | - Adam Roman Markowski
- Department of Internal Medicine and Gastroenterology, Polish Red Cross Memorial Municipal Hospital, 79 Henryk Sienkiewicz Street, 15-003 Bialystok, Poland;
| | - Iwona Jarocka-Karpowicz
- Department of Analytical Chemistry, Medical University of Bialystok, 15-089 Bialystok, Poland;
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2
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Karimi F, Thombare VJ, Hutton CA, O'Connor AJ, Qiao GG, Heath DE. Biomaterials functionalized with nanoclusters of integrin- and syndecan-binding ligands improve cell adhesion and mechanosensing under shear flow conditions. J Biomed Mater Res A 2020; 109:313-325. [PMID: 32490581 DOI: 10.1002/jbm.a.37024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 04/20/2020] [Accepted: 04/27/2020] [Indexed: 12/11/2022]
Abstract
We have engineered biomaterials that display nanoclusters of ligands that bind both integrin and syndecan-4 cell receptors. These surfaces regulate cell behaviors under static conditions including adhesion, spreading, actin stress fiber formation, and migration. The syndecan-4 receptors are also critical mediators of cellular mechanotransduction. In this contribution we assess whether this novel class of materials can regulate the response of cells to applied mechanical stimulation, using the shear stress imparted by laminar fluid flow as a model stimulus. Specifically, we assess endothelial cell detachment due to flow, cell alignment due to flow, and cell adhesion from the flowing fluid. A high degree of cell retention was observed on surfaces containing integrin-binding ligands or a mixed population of integrin- and syndecan-binding ligands. However, the presence of both ligand types was necessary for the cells to align in the direction of flow. These results imply that integrin engagement is necessary for adhesion strength, but engagement of both receptor types aids in appropriate mechanotransduction. Additionally, it was found that surfaces functionalized with both ligand types were able to scavenge a larger number of cells from flow, and to do so at a faster rate, compared to surfaces functionalized with only integrin- or syndecan-binding ligands. These results show that interfaces functionalized with both integrin- and syndecan-binding ligands regulate a significant range of biophysical cell behaviors in response to shear stress.
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Affiliation(s)
- Fatemeh Karimi
- Department of Biomedical Engineering, Particulate Fluids Processing Centre, University of Melbourne, Parkville, Victoria, Australia.,Polymer Science Group, Department of Chemical Engineering, Particulate Fluid Processing Centre, University of Melbourne, Parkville, Victoria, Australia.,Graduate School of Biomedical Engineering, University of New South Wales, Sydney, Australia
| | - Varsha Jagannath Thombare
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Victoria, Australia
| | - Craig A Hutton
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Victoria, Australia
| | - Andrea J O'Connor
- Department of Biomedical Engineering, Particulate Fluids Processing Centre, University of Melbourne, Parkville, Victoria, Australia
| | - Greg G Qiao
- Polymer Science Group, Department of Chemical Engineering, Particulate Fluid Processing Centre, University of Melbourne, Parkville, Victoria, Australia
| | - Daniel E Heath
- Department of Biomedical Engineering, Particulate Fluids Processing Centre, University of Melbourne, Parkville, Victoria, Australia
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3
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Liao J, Wu S, Li K, Fan Y, Dunne N, Li X. Peptide‐modified bone repair materials: Factors influencing osteogenic activity. J Biomed Mater Res A 2019; 107:1491-1512. [DOI: 10.1002/jbm.a.36663] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 01/29/2019] [Accepted: 02/14/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Jie Liao
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of EducationSchool of Biological Science and Medical Engineering, Beihang University Beijing 100083 China
| | - Shuai Wu
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of EducationSchool of Biological Science and Medical Engineering, Beihang University Beijing 100083 China
| | - Kun Li
- State Key Laboratory of Powder MetallurgyCentral South University Changsha 410083 China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of EducationSchool of Biological Science and Medical Engineering, Beihang University Beijing 100083 China
- Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University Beijing 100083 China
| | - Nicholas Dunne
- Centre for Medical Engineering ResearchSchool of Mechanical and Manufacturing Engineering, Dublin City University Stokes Building, Collins Avenue, Dublin 9 Ireland
| | - Xiaoming Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of EducationSchool of Biological Science and Medical Engineering, Beihang University Beijing 100083 China
- Beijing Advanced Innovation Center for Biomedical EngineeringBeihang University Beijing 100083 China
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4
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Zapp C, Minsky BB, Boehm H. Tuning RGD Motif and Hyaluronan Density to Study Integrin Binding. Front Physiol 2018; 9:1022. [PMID: 30131707 PMCID: PMC6090076 DOI: 10.3389/fphys.2018.01022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Accepted: 07/10/2018] [Indexed: 01/25/2023] Open
Abstract
Well-controlled surfaces with immobilized substrates enable novel approaches to investigate specific aspects of biological processes related to cell adhesion or motility. A subset of integrins, cellular transmembrane glycoproteins, recognize the evolutionarily conserved tripeptide sequence RGD, and anchor cells to their surrounding proteins as well as mediate bidirectional signaling. In this study, the main question was how co-presentation of hyaluronan (HA), an essential component of the extracellular matrix (ECM), and the RGD motif affect integrin binding. We report a method to prepare self-assembled monolayers on gold surfaces, co-presenting the cell adhesive RGD motif and small HA molecules, to investigate integrin containing proteoliposome binding. This technique enables an independent adjustment of the RGD motif and HA density while maintaining a passivating background: Layer formation and subsequent interactions with αIIbβ3 integrins, which are reconstituted in liposomes, was monitored by label-free quartz crystal microbalance with dissipation monitoring (QCM-D). Exceeding a critical RGD motif density of 40% results in enhanced binding of proteoliposomes. Co-presentation studies with varying HA and constant RGD motif density demonstrate that marginal amounts of HA are sufficient to prevent integrin binding. These findings are of specific importance in relation to cancer cell microenvironments, which show highly enriched HA in the surrounding ECM to reduce adhesion properties.
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Affiliation(s)
- Cornelia Zapp
- Department of Cellular Biophysics, Max Planck Institute for Medical Research, Heidelberg, Germany.,Physical Chemistry, Heidelberg University, Heidelberg, Germany
| | - Burcu B Minsky
- Department of Cellular Biophysics, Max Planck Institute for Medical Research, Heidelberg, Germany
| | - Heike Boehm
- Department of Cellular Biophysics, Max Planck Institute for Medical Research, Heidelberg, Germany.,Physical Chemistry, Heidelberg University, Heidelberg, Germany
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5
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Liang Y, Li S, Wang X, Zhang Y, Sun Y, Wang Y, Wang X, He B, Dai W, Zhang H, Wang X, Zhang Q. A comparative study of the antitumor efficacy of peptide-doxorubicin conjugates with different linkers. J Control Release 2018; 275:129-141. [DOI: 10.1016/j.jconrel.2018.01.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 01/06/2018] [Accepted: 01/30/2018] [Indexed: 12/12/2022]
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6
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Frutos S, Jordan JB, Bio MM, Muir TW, Thiel OR, Vila-Perelló M. Access to site-specific Fc-cRGD peptide conjugates through streamlined expressed protein ligation. Org Biomol Chem 2018; 14:9549-9553. [PMID: 27722696 DOI: 10.1039/c6ob01833e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An ideal drug should be highly effective, non-toxic and be delivered by a convenient and painless single dose. We are still far from such optimal treatment but peptides, with their high target selectivity and low toxicity profiles, provide a very attractive platform from which to strive towards it. One of the major limitations of peptide drugs is their high clearance rates, which limit dosage regimen options. Conjugation to antibody Fc domains is a viable strategy to improve peptide stability by increasing their hydrodynamic radius and hijacking the Fc recycling pathway. We report the use of a split-intein based semi-synthetic approach to site-specifically conjugate a synthetic integrin binding peptide to an Fc domain. The strategy described here allows conjugating synthetic peptides to Fc domains, which is not possible via genetic methods, fully maintaining the ability of both the Fc domain and the bioactive peptide to interact with their binding partners.
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Affiliation(s)
- S Frutos
- ProteoDesign S.L., Baldiri Reixac 10-12, 08028 Barcelona, Spain.
| | - J B Jordan
- Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320, USA.
| | - M M Bio
- Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320, USA.
| | - T W Muir
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - O R Thiel
- Amgen Inc., One Amgen Center Drive, Thousand Oaks, CA 91320, USA.
| | - M Vila-Perelló
- ProteoDesign S.L., Baldiri Reixac 10-12, 08028 Barcelona, Spain.
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7
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Das K, Nimushakavi S, Chaudhuri A, Das PK. An Integrin-Targeting RGDK-Tagged Nanocarrier: Anticancer Efficacy of Loaded Curcumin. ChemMedChem 2017; 12:738-750. [DOI: 10.1002/cmdc.201700085] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 04/10/2017] [Indexed: 02/02/2023]
Affiliation(s)
- Krishnendu Das
- Department of Biological Chemistry; Indian Association for the Cultivation of Science; Jadavpur Kolkata 700032 India
| | - Sahithi Nimushakavi
- Biomaterials Group; CSIR - Indian Institute of Chemical Technology; Hyderabad 500007 India
| | - Arabinda Chaudhuri
- Biomaterials Group; CSIR - Indian Institute of Chemical Technology; Hyderabad 500007 India
| | - Prasanta Kumar Das
- Department of Biological Chemistry; Indian Association for the Cultivation of Science; Jadavpur Kolkata 700032 India
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8
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Sackmann E, Smith AS. Physics of cell adhesion: some lessons from cell-mimetic systems. SOFT MATTER 2014; 10:1644-59. [PMID: 24651316 PMCID: PMC4028615 DOI: 10.1039/c3sm51910d] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Cell adhesion is a paradigm of the ubiquitous interplay of cell signalling, modulation of material properties and biological functions of cells. It is controlled by competition of short range attractive forces, medium range repellant forces and the elastic stresses associated with local and global deformation of the composite cell envelopes. We review the basic physical rules governing the physics of cell adhesion learned by studying cell-mimetic systems and demonstrate the importance of these rules in the context of cellular systems. We review how adhesion induced micro-domains couple to the intracellular actin and microtubule networks allowing cells to generate strong forces with a minimum of attractive cell adhesion molecules (CAMs) and to manipulate other cells through filopodia over micrometer distances. The adhesion strength can be adapted to external force fluctuations within seconds by varying the density of attractive and repellant CAMs through exocytosis and endocytosis or protease-mediated dismantling of the CAM-cytoskeleton link. Adhesion domains form local end global biochemical reaction centres enabling the control of enzymes. Actin-microtubule crosstalk at adhesion foci facilitates the mechanical stabilization of polarized cell shapes. Axon growth in tissue is guided by attractive and repulsive clues controlled by antagonistic signalling pathways.
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Affiliation(s)
- Erich Sackmann
- Physics Department Technical University Munich, Germany
- Department of Physics, Ludwig-Maximillian University, Munich, Germany
| | - Ana-Sunčana Smith
- Institute for Theoretical Physics, Friedrich Alexander University Erlangen-Nürnberg, Erlangen, Germany
- Institute Rud̷er Bošković, Zagreb, Croatia.
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9
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Welsh DJ, Posocco P, Pricl S, Smith DK. Self-assembled multivalent RGD-peptide arrays – morphological control and integrin binding. Org Biomol Chem 2013; 11:3177-86. [DOI: 10.1039/c3ob00034f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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10
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Barnard A, Smith DK. Selbstorganisierte Multivalenz: dynamische Ligandenanordnungen für hochaffine Bindungen. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200076] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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11
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Barnard A, Smith DK. Self-assembled multivalency: dynamic ligand arrays for high-affinity binding. Angew Chem Int Ed Engl 2012; 51:6572-81. [PMID: 22689381 DOI: 10.1002/anie.201200076] [Citation(s) in RCA: 146] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Indexed: 12/12/2022]
Abstract
Multivalency is a powerful strategy for achieving high-affinity molecular recognition in biological systems. Recently, attention has begun to focus on using self-assembly rather than covalent scaffold synthesis to organize multiple ligands. This approach has a number of advantages, including ease of synthesis/assembly, tunability of nanostructure morphology and ligands, potential to incorporate multiple active units, and the responsive nature of self-assembly. We suggest that self-assembled multivalency is a strategy of fundamental importance in the design of synthetic nanosystems to intervene in biological pathways and has potential applications in nanomedicine.
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Affiliation(s)
- Anna Barnard
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
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12
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Welsh DJ, Smith DK. Comparing dendritic and self-assembly strategies to multivalency—RGD peptide–integrin interactions. Org Biomol Chem 2011; 9:4795-801. [DOI: 10.1039/c1ob05241a] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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13
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The use of RGDGWK-lipopeptide to selectively deliver genes to mouse tumor vasculature and its complexation with p53 to inhibit tumor growth. Biomaterials 2010; 31:1787-97. [DOI: 10.1016/j.biomaterials.2009.10.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2009] [Accepted: 10/09/2009] [Indexed: 11/21/2022]
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14
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Sandrin L, Coche-Guérente L, Bernstein A, Basit H, Labbé P, Dumy P, Boturyn D. Cell adhesion through clustered ligand on fluid supported lipid bilayers. Org Biomol Chem 2010; 8:1531-4. [DOI: 10.1039/b924523e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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15
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Liu Y, Wang W, Wang J, Wang Y, Yuan Z, Tang S, Liu M, Tang H. Blood compatibility evaluation of poly(D,L-lactide-co-beta-malic acid) modified with the GRGDS sequence. Colloids Surf B Biointerfaces 2009; 75:370-6. [PMID: 19811897 DOI: 10.1016/j.colsurfb.2009.09.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2009] [Revised: 08/16/2009] [Accepted: 09/13/2009] [Indexed: 10/20/2022]
Abstract
Endothelialization is an ideal approach to improve the blood compatibility of synthetic polymers. However, cell detachment is inevitable under shear flow conditions. Therefore, the issue of blood compatibility needs to be addressed for both the bare and the endothelialized polymer. RGD-containing polymer P-GS5 was synthesized by modification of poly(D,L-lactide-co-beta-malic acid) (PLMA) with the peptide GRGDS. The compositions, molecular weights and hydrophilicities of poly(D,L-lactide) (PDLLA), PLMA, and P-GS5 were characterized by nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), gel-permeation chromatography (GPC) and water contact angle measurements, respectively. The blood compatibilities of the bare and the endothelialized polymers were evaluated by clotting time and platelet adhesion tests. The results showed that the coagulation pathways were not influenced before and after cell culture; the bare P-GS5 attracted less platelet adhesion and induced lower pseudopodia extension compared with PDLLA and PLMA, and the platelet adhesion on P-GS5 was almost completely eliminated after cell seeding. The results suggest that P-GS5 could be a potentially useful material in vascular tissue engineering.
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Affiliation(s)
- Yuan Liu
- Key Laboratory of Functional Polymer Materials, Ministry of Education, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China
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16
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Streicher P, Nassoy P, Bärmann M, Dif A, Marchi-Artzner V, Brochard-Wyart F, Spatz J, Bassereau P. Integrin reconstituted in GUVs: a biomimetic system to study initial steps of cell spreading. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:2291-300. [PMID: 19665445 DOI: 10.1016/j.bbamem.2009.07.025] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2009] [Revised: 07/10/2009] [Accepted: 07/27/2009] [Indexed: 10/20/2022]
Abstract
A novel in vitro membrane system mimicking the first steps of integrin-mediated cell spreading has been developed and characterized. We have reconstituted the transmembrane alpha(IIb)beta(3) integrin into giant unilamellar vesicles (GUVs). The reconstitution process has been validated by analyzing protein incorporation and biological activity by checking the specific interaction of GUVs containing integrin with quantum dots (QD) or surfaces coated with the integrin receptor tri-peptide RGD.(1) The spreading dynamics of integrin-functionalized GUVs onto fibrinogen-coated surfaces has been monitored by Reflection Interference Contrast Microscopy (RICM). Our results are quantitatively consistent with a theoretical model based on a dewetting process coupled to binder diffusion and provide a comprehensive description of the following sequence: i) nucleation and growth of adhesive patches coupled to the diffusion of the adhesive proteins to these adhesive zones ii) fusion of patches and formation of an adhesive ring iii) complete spreading of the GUV by dewetting of the central liquid film from the border to form an adhesive circular patch that is not significantly enriched in integrins, as compared to the unbound membrane. This finding is consistent with the recognized role of the actin cytoskeleton in stabilizing focal complexes and focal adhesions in a cell-extracellular matrix contact. These very large unilamellar integrin-containing vesicles provide a unique artificial system, which could be further developed towards realistic cell mimic and used to study the complexity of integrin-mediated cell spreading.
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Affiliation(s)
- Pia Streicher
- Institut Curie, Centre de Recherche, Université Pierre et Marie Curie, F-75248 Paris, France
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17
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Pramanik D, Majeti BK, Mondal G, Karmali PP, Sistla R, Ramprasad OG, Srinivas G, Pande G, Chaudhuri A. Lipopeptide with a RGDK tetrapeptide sequence can selectively target genes to proangiogenic alpha5beta1 integrin receptor and mouse tumor vasculature. J Med Chem 2009; 51:7298-302. [PMID: 18956861 DOI: 10.1021/jm800915y] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Integrins, the major class of alphabeta heterodimeric transmembrane glycoprotein receptors, play crucial roles in mediating tumor angiogenesis. Genetic ablation experiments combined with use of antibodies/peptide ligands for blocking either alpha(5) or beta(1) integrins have convincingly demonstrated alpha(5)beta(1) integrin to be unquestionably proangiogenic among the 24 known integrin receptors. Herein, we report on a novel RGDK-lipopeptide 1 that targets selectively alpha(5)beta(1) integrin and is capable of targeting genes to mouse tumor vasculatures.
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Affiliation(s)
- Dipankar Pramanik
- Division of Lipid Science and Technology, Pharmacology Division, Indian Institute of Chemical Technology, Hyderabad 500607, India
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18
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Battistini L, Burreddu P, Carta P, Rassu G, Auzzas L, Curti C, Zanardi F, Manzoni L, Araldi EMV, Scolastico C, Casiraghi G. 4-Aminoproline-based arginine-glycine-aspartate integrin binders with exposed ligation points: practical in-solution synthesis, conjugation and binding affinity evaluation. Org Biomol Chem 2009; 7:4924-35. [DOI: 10.1039/b914836a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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19
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Tutus M, Rossetti FF, Schneck E, Fragneto G, Förster F, Richter R, Nawroth T, Tanaka M. Orientation-Selective Incorporation of Transmembrane F0F1ATP Synthase Complex fromMicrococcus luteusin Polymer-Supported Membranes. Macromol Biosci 2008; 8:1034-43. [DOI: 10.1002/mabi.200800128] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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20
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Schubert T, Bärmann M, Rusp M, Gränzer W, Tanaka M. Diffusion of glycosylphosphatidylinositol (GPI)-anchored bovine prion protein (PrPc) in supported lipid membranes studied by single-molecule and complementary ensemble methods. J Memb Sci 2008. [DOI: 10.1016/j.memsci.2007.10.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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21
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Smith AS, Sengupta K, Goennenwein S, Seifert U, Sackmann E. Force-induced growth of adhesion domains is controlled by receptor mobility. Proc Natl Acad Sci U S A 2008; 105:6906-11. [PMID: 18463289 PMCID: PMC2383988 DOI: 10.1073/pnas.0801706105] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2007] [Indexed: 01/08/2023] Open
Abstract
In living cells, adhesion structures have the astonishing ability to grow and strengthen under force. Despite the rising evidence of the importance of this phenomenon, little is known about the underlying mechanism. Here, we show that force-induced adhesion-strengthening can occur purely because of the thermodynamic response to the elastic deformation of the membrane, even in the absence of the actively regulated cytoskeleton of the cell, which was hitherto deemed necessary. We impose pN-forces on two fluid membranes, locally pre-adhered by RGD-integrin binding. One of the binding partners is always mobile whereas the mobility of the other can be switched on or off. Immediate passive strengthening of adhesion structures occurs in both cases. When both binding partners are mobile, strengthening is aided by lateral movement of intact bonds as a transient response to force-induced membrane-deformation. By extending our microinterferometric technique to the suboptical regime, we show that the adhesion, as well as the resistance to force-induced de-adhesion, is greatly enhanced when both, rather than only one, of the binding partners are mobile. We formulate a theory that explains our observations by linking the macroscopic shape deformation with the microscopic formation of bonds, which further elucidates the importance of receptor mobility. We propose this fast passive response to be the first-recognition that triggers signaling events leading to mechanosensing in living cells.
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Affiliation(s)
- Ana-Suncana Smith
- II. Institut für Theoretische Physik II, Universität Stuttgart, Pfaffenwaldring 57/III, D-70550 Stuttgart, Germany.
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22
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Lieleg O, López-García M, Semmrich C, Auernheimer J, Kessler H, Bausch AR. Specific integrin labeling in living cells using functionalized nanocrystals. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2007; 3:1560-5. [PMID: 17705315 DOI: 10.1002/smll.200700148] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We present an integrin labeling method using functionalized quantum dots (QDs). Cyclic Arg-Gly-Asp (RGD) peptides and a biotin-streptavidin linkage are used to specifically couple individual QDs to integrins of living cells. The spacer distance between the RGD sequence and the QD surface is a crucial parameter to ensure specific binding to individual alpha(v)beta(3) integrins of osteoblast cells. Despite blinking, the position of single QDs is tracked with nanometer precision and localized diffusive behavior is observed. We show that blinking events do not prevent the acquisition of quantitative parameters from the QD trajectories.
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Affiliation(s)
- Oliver Lieleg
- Lehrstuhl für Biophysik E22, Technische Universität München, Garching, Germany
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23
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Purrucker O, Gönnenwein S, Förtig A, Jordan R, Rusp M, Bärmann M, Moroder L, Sackmann E, Tanaka M. Polymer-tethered membranes as quantitative models for the study of integrin-mediated cell adhesion. SOFT MATTER 2007; 3:333-336. [PMID: 32900149 DOI: 10.1039/b612069e] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Here we report a remarkable enhancement in the adhesion strength of transmembrane cell receptors, human platelet integrin, in a new class of supported lipid membranes, which are separated from the solid substrates by linear polymer spacers. The amphiphilic polymer tether consists of linear hydrophilic poly(2-oxazoline) chains of defined length (degree of polymerization n = 104, MW/Mn = 1.30), whose chain termini are functionalized with the tri-functional silane surface coupling group and hydrophobic n-alkyl chains as membrane anchors (lipopolymers). As a model of test cells, giant lipid vesicles were functionalized with synthetic ligand molecules containing the RGD sequence, and the free energy of adhesion Δgad between the integrin-doped tethered membrane and the vesicle was measured using a micro-interferometry technique. It has been demonstrated that the adhesion function of integrin receptors in these polymer-tethered membranes is 30 times stronger than those incorporated into membranes directly deposited onto solid substrates (solid-supported membranes). The obtained results demonstrate that linear lipopolymer spacers provide a fluid and non-denaturing environment for the incorporated cell receptors and allow quantitative modelling of cell adhesion processes.
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Affiliation(s)
- Oliver Purrucker
- Lehrstuhl für Biophysik E22, Technische Universität München, 85748, Garching, Germany
| | - Stefanie Gönnenwein
- Lehrstuhl für Biophysik E22, Technische Universität München, 85748, Garching, Germany
| | - Anton Förtig
- Lehrstuhl für Makromolekulare Stoffe, Department Chemie, Technische Universität München, 85748, Garching, Germany.
| | - Rainer Jordan
- Lehrstuhl für Makromolekulare Stoffe, Department Chemie, Technische Universität München, 85748, Garching, Germany. and Department of Chemistry, Chemical Engineering and Materials Science, Polytechnic University, Brooklyn, NY 11201, USA
| | - Monika Rusp
- Lehrstuhl für Biophysik E22, Technische Universität München, 85748, Garching, Germany
| | - Michael Bärmann
- Lehrstuhl für Biophysik E22, Technische Universität München, 85748, Garching, Germany
| | - Luis Moroder
- Max-Planck-Institut für Biochemie, 82152, Martinsried, Germany
| | - Erich Sackmann
- Lehrstuhl für Biophysik E22, Technische Universität München, 85748, Garching, Germany
| | - Motomu Tanaka
- Lehrstuhl für Biophysik E22, Technische Universität München, 85748, Garching, Germany and Lehrstuhl für Biophysikalische Chemie, Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120, Heidelberg, Germany
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24
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Razkin J, Josserand V, Boturyn D, Jin ZH, Dumy P, Favrot M, Coll JL, Texier I. Activatable fluorescent probes for tumour-targeting imaging in live mice. ChemMedChem 2007; 1:1069-72. [PMID: 16944544 DOI: 10.1002/cmdc.200600118] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jesus Razkin
- LEDSS, UMR CNRS 5616, 301 Rue de la Chimie, BP 53, Grenoble Cedex 9, France
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25
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Kraemer B, Schellenberg GD. Using Caenorhabditis elegans models of neurodegenerative disease to identify neuroprotective strategies. INTERNATIONAL REVIEW OF NEUROBIOLOGY 2007; 77:219-46. [PMID: 17178476 DOI: 10.1016/s0074-7742(06)77007-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Brian Kraemer
- Geriatric Research Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, Seattle Division, Seattle, Washington 98108, USA
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26
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Frochot C, Di Stasio B, Vanderesse R, Belgy MJ, Dodeller M, Guillemin F, Viriot ML, Barberi-Heyob M. Interest of RGD-containing linear or cyclic peptide targeted tetraphenylchlorin as novel photosensitizers for selective photodynamic activity. Bioorg Chem 2006; 35:205-20. [PMID: 17223161 DOI: 10.1016/j.bioorg.2006.11.005] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2006] [Revised: 11/28/2006] [Accepted: 11/30/2006] [Indexed: 12/24/2022]
Abstract
Destruction of the neovasculature is essential for tumor eradication by photodynamic therapy. Since the over-expression of integrins is correlated with tumor angiogenesis, we conjugated a photosensitizer (5-(4-carboxyphenyl)-10,15,20-triphenylchlorin or porphyrin) to the alpha(v)beta(3) integrin specific peptide RGD (H-Arg-Gly-Asp-OH) motif as a common sequence. We reported an efficient solid-phase synthesis of a new family of peptidic photosensitizers with linear or cyclic[RGDfK] RGD motif and compared conjugates in vitro selectivity and photodynamic activity. The conjugates were characterized by (1)H NMR, MALDI, UV-visible spectroscopy and singlet oxygen formation was performed. Chlorins containing linear and constrained RGD motif were incorporated up to 98- and 80-fold more, respectively, than the unconjugated photosensitizer over a 24-h exposure in human umbilical vein endothelial cells (HUVEC) over-expressing alpha(v)beta(3) integrin. Peptidic moiety also led to a non-specific increased cellular uptake by murine mammary carcinoma cells (EMT-6), lacking RGD binding receptors. Survival measurements demonstrated that HUVEC were greatly sensitive to conjugates-mediated photodynamic therapy.
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Affiliation(s)
- Céline Frochot
- DCPR, UMR 7630 CNRS-INPL, Groupe ENSIC, Nancy Université, 1 rue Grandville, 54000 Nancy, France
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27
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Kokkoli E, Mardilovich A, Wedekind A, Rexeisen EL, Garg A, Craig JA. Self-assembly and applications of biomimetic and bioactive peptide-amphiphiles. SOFT MATTER 2006; 2:1015-1024. [PMID: 32680204 DOI: 10.1039/b608929a] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Peptide-amphiphiles are amphiphilic structures with a hydrophilic peptide headgroup that incorporates a bioactive sequence and has the potential to form distinct structures, and a hydrophobic tail that serves to align the headgroup, drive self-assembly, and induce secondary and tertiary conformations. In this paper we review the different self-assembled structures of peptide-amphiphiles that range from micelles and nanofibers, to patterned membranes. We also describe several examples where peptide-amphiphiles have found applications as soft bioactive materials for model studies of bioadhesion and characterization of different cellular phenomena, as well as scaffolds for tissue engineering, regenerative medicine, and targeted drug delivery.
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Affiliation(s)
- Efrosini Kokkoli
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Anastasia Mardilovich
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Alison Wedekind
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Emilie L Rexeisen
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Ashish Garg
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA.
| | - Jennifer A Craig
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
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28
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Pallu S, Bourget C, Bareille R, Labrugère C, Dard M, Sewing A, Jonczyk A, Vernizeau M, Christine Durrieu M, Amédée-Vilamitjana J. The effect of cyclo-DfKRG peptide immobilization on titanium on the adhesion and differentiation of human osteoprogenitor cells. Biomaterials 2005; 26:6932-40. [PMID: 15950276 DOI: 10.1016/j.biomaterials.2005.04.054] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2004] [Accepted: 04/20/2005] [Indexed: 11/30/2022]
Abstract
This study takes place in the field of development of a bioactive surface of titanium alloys. In this paper, titanium was functionalized with cyclo-DfKRG peptide by coating or grafting using different anchors (thiol or phosphonate) as spacers between the surface and the peptide. Cell adhesion, and differentiation of human osteoprogenitor (HOP) cells arising from human bone marrow were investigated. Our results seem to demonstrate that cyclo-DfKRG peptide coating with a phosphonate anchor and grafting procedure contributes to higher cell adhesion and a strong ALP and Cbfa1 mRNA expression, after 10 days of cell seeding. At the contrary, this peptide coated with a thiol anchor stimulates differentiation of HOP within 3 days of culture.
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Affiliation(s)
- Stéphane Pallu
- INSERM, U577, Université Victor Segalen, Bordeaux, France.
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29
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Sinner EK, Reuning U, Kök FN, Saccà B, Moroder L, Knoll W, Oesterhelt D. Incorporation of integrins into artificial planar lipid membranes: characterization by plasmon-enhanced fluorescence spectroscopy. Anal Biochem 2005; 333:216-24. [PMID: 15450795 DOI: 10.1016/j.ab.2004.05.022] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2004] [Indexed: 11/27/2022]
Abstract
An optimized peptide-tethered artificial lipid membrane system has been developed. Integrins (cell adhesion receptors) were functionally incorporated into this membrane model and integrin-ligand interactions were analyzed by surface plasmon-enhanced fluorescence spectroscopy (SPFS). The transmembrane receptors alpha(v)beta(3) and alpha(1)beta(1) of the integrin superfamily were incorporated into a lipid-functionalized peptide layer by vesicle spreading. Consecutive layer formations were monitored by surface plasmon spectroscopy (SPS). Orientation and accessibility of the membrane receptor alpha(v)beta(3) was reliably assessed by specific and reproducible binding of selective antibodies. Moreover, full retention of the functional properties of this receptor was verified by specific and reversible binding of natural ligands. Functional integrity of incorporated integrins was maintained over a time period of 72 h. The integrin/extracellular matrix ligand complexes, whose formations are known to depend on the presence of divalent cations, were lost upon addition of ethylenediaminetetraacetate. Therefore, regeneration of the surface for further binding experiments with minimized unspecific ligand association was possible. These results demonstrate that integrins can be functionally incorporated into peptide-tethered artificial membranes. In combination with the SPS/SPFS method, this artificial membrane system provides a reliable experimental platform for investigation of isolated membrane proteins under experimental conditions resembling those of their native environment.
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30
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Keegan N, Wright NG, Lakey JH. Circular Dichroism Spectroscopy of Folding in a Protein Monolayer. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200462977] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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31
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Keegan N, Wright NG, Lakey JH. Circular Dichroism Spectroscopy of Folding in a Protein Monolayer. Angew Chem Int Ed Engl 2005; 44:4801-4. [PMID: 16028206 DOI: 10.1002/anie.200462977] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Neil Keegan
- Institute of Cell and Molecular Biosciences and Institute for Nanoscale Science and Technology, University of Newcastle upon Tyne, Newcastle, UK
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32
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Milbradt AG, Löweneck M, Krupka SS, Reif M, Sinner EK, Moroder L, Renner C. Photomodulation of conformational states. IV. Integrin-binding RGD-peptides with (4-aminomethyl)phenylazobenzoic acid as backbone constituent. Biopolymers 2005; 77:304-13. [PMID: 15637699 DOI: 10.1002/bip.20226] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In previous studies we have investigated octapeptides backbone-cyclized by (4-amino)phenyl azobenzoic acid (APB) or (4-aminomethyl)phenylazobenzoic acid (AMPB) and containing the active-site sequence Cys-Ala-Thr-Cys-Asp from the thioredoxin reductase. The conformational and redox properties of these peptides were strongly dependent on the isomeric state of the azobenzene chromophore. Using the same approach we were successful in constructing photoresponsive ligands for alphavbeta3 integrin containing the Arg-Gly-Asp (RGD) sequence as binding motif. For achieving maximal conformational restriction of the peptide a reduced ring size compared to our previous azobenzene peptides was employed in the cyclic peptide c[Asp-D-Phe-Val-AMPB-Lys-Ala-Arg-Gly-]. Conformational properties of the trans and cis isomers of this peptide in solution were investigated by CD and NMR and were found to differ markedly from the thioredoxin derived azobenzene peptides. In a second peptide, c[Asp-D-Phe-Val-Lys-AMPB-Ala-Arg-Gly-], shifting the position of the chromophore lead to a marked decrease in affinity. With the availability of the x-ray structure of a cyclic RGD-pentapeptide bound to alphavbeta3 integrin (PDB entry 1L5G) modeling of possible bound conformations for trans and cis isomers of both azobenzene peptides was possible. Notably, both peptides in either isomeric form share the same overall conformation in the bound state according to our molecular dynamics simulations.
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33
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Park SJ, Park S, Ahn HC, Kim IS, Lee BJ. Conformational resemblance between the structures of integrin-activating pentapetides derived from betaig-h3 and RGD peptide analogues in a membrane environment. Peptides 2004; 25:199-205. [PMID: 15063001 DOI: 10.1016/j.peptides.2003.12.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2003] [Revised: 12/06/2003] [Accepted: 12/09/2003] [Indexed: 11/30/2022]
Abstract
The peptides NKDIL and EPDIM, respectively derived from the 2nd and 4th domains of betaig-h3, were fully active in mediating cell adhesion through interactions with alpha3beta1 integrin [Biochem. Biophys. Res. Commun. 294 (2002) 940; J. Biol. Chem. 275 (2000) 30907]. Here, the conformational differences between NKDIL and EPDIM in water and in membrane environments were studied using CD spectroscopy, and their structures in sodium dodecylsulfate micelles were determined by NMR. The two peptides adopt beta-turn structures like RGD peptides, and have more regular structures in micelles than in aqueous buffers. EPDIM shows a distorted type I beta-turn for the PDIM segment in a membrane environment. The structure of NKDIL is similar with the standard type I' beta-turn, but shows large backbone flexibility even in a membrane environment. The conformational change of the 4th repeated domain of betaig-h3 in micelle solutions suggests that the Asp-Ile motif of the 4th fas-1 domain (EPDIM) would be solvent-exposed and could interact with integrin alpha3beta1 in a membrane environment. The present study provides a structural basis of betaig-h3 function and information for the development of integrin-regulating drugs involving the wound healing protein.
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Affiliation(s)
- Sung Jean Park
- National Research Laboratory (MPS), College of Pharmacy, Seoul National University, Seoul 151-742, South Korea
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34
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Goennenwein S, Tanaka M, Hu B, Moroder L, Sackmann E. Functional incorporation of integrins into solid supported membranes on ultrathin films of cellulose: impact on adhesion. Biophys J 2003; 85:646-55. [PMID: 12829518 PMCID: PMC1303119 DOI: 10.1016/s0006-3495(03)74508-1] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2002] [Accepted: 02/10/2003] [Indexed: 10/21/2022] Open
Abstract
Biomimetic models of cell surfaces were designed to study the physical basis of cell adhesion. Vesicles bearing reconstituted blood platelet integrin receptors alpha(IIb)beta(3) were spread on ultrathin films of cellulose, forming continuous supported membranes. One fraction of the integrin receptors, which were facing their extracellular domain toward the aqueous phase, were mobile, exhibiting a diffusion constant of 0.6 micro m(2) s(-1). The functionality of receptors on bare glass and on cellulose cushions was compared by measuring adhesion strength to giant vesicles. The vesicles contained lipid-coupled cyclic hexapeptides that are specifically recognized by integrin alpha(IIb)beta(3). To mimic the steric repulsion forces of the cell glycocalix, lipids with polyethylene glycol headgroups were incorporated into the vesicles. The free adhesion energy per unit area deltag(ad) was determined by micro-interferometric analysis of the vesicle's contour near the membrane surface in terms of the equilibrium of the elastic forces. By accounting for the reduction of the adhesion strength by the repellers and from measuring the density of receptors one could estimate the specific receptor ligand binding energy. We estimate the receptor-ligand binding energy to be 10 k(B)T under bioanalogue conditions.
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35
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Schütt M, Krupka SS, Milbradt AG, Deindl S, Sinner EK, Oesterhelt D, Renner C, Moroder L. Photocontrol of cell adhesion processes: model studies with cyclic azobenzene-RGD peptides. CHEMISTRY & BIOLOGY 2003; 10:487-90. [PMID: 12837381 DOI: 10.1016/s1074-5521(03)00128-5] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A photoresponsive integrin ligand was synthesized by backbone-cyclization of a heptapeptide containing the integrin binding motif Arg-Gly-Asp (RGD) with 4-(aminomethyl)phenylazobenzoic acid (AMPB). Surface plasmon enhanced fluorescence spectroscopy showed that binding of the azobenzene peptide to alpha(v)beta(3) integrin depends on the photoisomeric state of the peptide chromophore. The higher affinity of the trans isomer could be rationalized by comparing the NMR conformations of the cis and trans isomers with the recently solved X-ray structure of a cyclic RGD-pentapeptide bound to integrin.
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Affiliation(s)
- Markus Schütt
- Max-Planck-Institut für Biochemie, Am Klopferspitz 18A, 82152, Martinsried, Germany
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36
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Vella F, Thielens NM, Bersch B, Arlaud GJ, Frachet P. A recombinant chimeric epidermal growth factor-like module with high binding affinity for integrins. J Biol Chem 2003; 278:19834-43. [PMID: 12654911 DOI: 10.1074/jbc.m301470200] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Integrins are cell surface receptors involved in numerous pathological processes such as metastasis invasion and abnormal angiogenesis. To target these receptors, the epidermal growth factor (EGF)-like domain of human complement protease C1r was used as a natural scaffold to design chimeric modules containing the RGD motif. Here we report a high yield bacterial expression system and its application to the production of two such modules, EGF-RGD and V2, the latter variant mimicking the RGD-containing domain of disintegrins. These modules were characterized chemically, and their biological activity was investigated by cellular assays using various Chinese hamster ovary cell lines expressing beta1 and beta3 integrins and by surface plasmon resonance spectroscopy. Remarkably, the modifications leading to the V2 variant had differential effects on the interaction with beta3 and beta1 integrins. The disintegrin-like V2 module exhibited enhanced binding affinities compared with EGF-RGD, with KD values of 7.2 nm for alpha5beta1 (a 4-fold decrease) and 3.5 nm for alphavbeta3 (a 1.5-fold decrease), comparable with the values determined for natural integrin ligands. Analysis by NMR spectroscopy also revealed a differential dynamic behavior of the RGD motif in the EGF-RGD and V2 variants, providing insights into the structural basis of their relative binding efficiency. These novel RGD-containing EGF modules open the way to the design of improved variants with selective affinity for particular integrins and their use as carriers for other biologically active modules.
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Affiliation(s)
- Fanny Vella
- Laboratoire d'Enzymologie Moléculaire, Institut de Biologie Structurale Jean-Pierre Ebel, (Commissariat à l'Energie Atomique CNRS, Université Joseph Fourier), Grenoble 38027 Cedex 1, France
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37
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Rahman A, Tseng Y, Wirtz D. Micromechanical coupling between cell surface receptors and RGD peptides. Biochem Biophys Res Commun 2002; 296:771-8. [PMID: 12176050 DOI: 10.1016/s0006-291x(02)00903-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Contact between an adherent cell and the extracellular matrix (ECM) promotes the recruitment of structural and signaling molecules to the cytoplasmic domain of integrins, which mediate cell adhesion, cell migration, and cell growth. It is unclear whether the intracellular recruitment of these cytoplasmic molecules enhances the affinity between the ECM and the extracellular domain of the cell surface receptors (integrins). Using soft microneedles coated with Arg-Gly-Asp (RGD) peptides, a sequence commonly shared by ECM proteins, we apply a localized ramp shear stress to the surface of a HeLa cell and measure the cell stiffness and the collective (or apparent) unbinding lifetime of its surface receptors to RGD. These measurements demonstrate that both cell stiffness and the collective cell surface receptor-RGD unbinding lifetime increase with the duration of the pre-shear cell-microneedle contact and with the rate of shear applied to the cell membrane. These parameters are also crucially dependent on the integrity of the actin filament network. Our results are consistent with a model of positive feedback signaling where RGD-mediated initial recruitment of cytoskeletal proteins to the cytoplasmic domain of integrins directly enhances the interaction between the extracellular domain of integrins and the RGD sequence of ECM molecules.
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Affiliation(s)
- Amit Rahman
- Department of Chemical Engineering, The Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA
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38
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Boulbitch A, Guttenberg Z, Sackmann E. Kinetics of membrane adhesion mediated by ligand-receptor interaction studied with a biomimetic system. Biophys J 2001; 81:2743-51. [PMID: 11606287 PMCID: PMC1301741 DOI: 10.1016/s0006-3495(01)75917-6] [Citation(s) in RCA: 117] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
We report the first measurement of the kinetics of adhesion of a single giant vesicle controlled by the competition between membrane-substrate interaction mediated by ligand-receptor interaction, gravitation, and Helfrich repulsion. To model the cell-tissue interaction, we doped the vesicles with lipid-coupled polymers (mimicking the glycocalix) and the reconstituted ligands selectively recognized by alpha(IIb)beta(3) integrin-mediating specific attraction forces. The integrin was grafted on glass substrates to act as a target cell. The adhesion of the vesicle membrane to the integrin-covered surface starts with the spontaneous formation of a small (approximately 200 nm) domain of tight adhesion, which then gradually grows until the whole adhesion area is in the state of tight adhesion. The time of adhesion varies from few tens of seconds to about one hour depending on the ligand and lipopolymer concentration. At small ligand concentrations, we observed the displacement xi of the front of tight adhesion following the square root law xi approximately t(1/2), whereas, at high concentrations, we found a linear law xi approximately t. We show both experimentally and theoretically that the t(1/2)-regime is dominated by diffusion of ligands, and the xi approximately t-regime by the kinetics of ligands-receptors association.
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Affiliation(s)
- A Boulbitch
- Department für Biophysik E22, Technische Universität München, D-85747 Garching bei München, Germany.
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39
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Abstract
We have compiled a comprehensive list of the articles published in the year 2000 that describe work employing commercial optical biosensors. Selected reviews of interest for the general biosensor user are highlighted. Emerging applications in areas of drug discovery, clinical support, food and environment monitoring, and cell membrane biology are emphasized. In addition, the experimental design and data processing steps necessary to achieve high-quality biosensor data are described and examples of well-performed kinetic analysis are provided.
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Affiliation(s)
- R L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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40
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Marchi-Artzner V, Lorz B, Hellerer U, Kantlehner M, Kessler H, Sackmann E. Selective adhesion of endothelial cells to artificial membranes with a synthetic RGD-lipopeptide. Chemistry 2001; 7:1095-101. [PMID: 11303868 DOI: 10.1002/1521-3765(20010302)7:5<1095::aid-chem1095>3.0.co;2-b] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A constrained cyclic ArgGly-Asp-D-Phe-Lys, abbreviated as cyclo(-RGDfK-), lipopeptide has been synthesized and incorporated into artificial membranes such as giant vesicles with DOPC and solid-supported lipid bilayers. The selective adhesion and spreading of endothelial cells of the human umbilical cord on solids functionalized by membranes with this RGD-lipopeptide have been observed. Furthermore, we have demonstrated strong selective adhesion of giant vesicles to endothelial cells through local adhesion domains by combined application of hydrodynamic flow field and reflection interference contrast microscopy (RICM). The adhesion can be inhibited by competition with a water-soluble RGD peptide. We suggest that this strategy could improve the efficiency of liposomes targeting used as vectors or as drug carriers to cells.
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Affiliation(s)
- V Marchi-Artzner
- Institut für Physik, Biophysik, Technische Universität München, Garching, Germany
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