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Sharma S, Kotamraju VR, Mölder T, Tobi A, Teesalu T, Ruoslahti E. Tumor-Penetrating Nanosystem Strongly Suppresses Breast Tumor Growth. NANO LETTERS 2017; 17:1356-1364. [PMID: 28178415 PMCID: PMC5819594 DOI: 10.1021/acs.nanolett.6b03815] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Antiangiogenic and vascular disrupting compounds have shown promise in cancer therapy, but tend to be only partially effective. We previously reported a potent theranostic nanosystem that was highly effective in glioblastoma and breast cancer mouse models, retarding tumor growth and producing some cures [ Agemy , L. et al. Proc. Natl. Acad. Sci. U.S.A. 2011 , 108 , 17450 - 17455 . Agemy , L. et al. Mol. Ther. 2013 , 21 , 2195 - 2204 .]. The nanosystem consists of iron oxide NPs ("nanoworms") coated with a composite peptide with tumor-homing and pro-apoptotic domains. The homing component targets tumor vessels by binding to p32/gC1qR at the surface or tumor endothelial cells. We sought to further improve the efficacy nanosystem by searching for an optimally effective homing peptide that would also incorporate a tumor-penetrating function. To this effect, we tested a panel of candidate p32 binding peptides with a sequence motif that conveys tumor-penetrating activity (CendR motif). We identified a peptide designated as Linear TT1 (Lin TT1) (sequence: AKRGARSTA) as most effective in causing tumor homing and penetration of the nanosystem. This peptide had the lowest affinity for p32 among the peptides tested. The low affinity may have moderated the avidity effect from the multivalent presentation on nanoparticles (NPs), such that the NPs avoid getting trapped by the so-called "binding-site barrier", which can hinder tissue penetration of compounds with a high affinity for their receptors. Treatment of breast cancer mice with the LinTT1 nanosystem showed greatly improved efficacy compared to the original system. These results identify a promising treatment modality and underscore the value of tumor penetration effect in improving the efficacy tumor treatment.
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Affiliation(s)
- Shweta Sharma
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA 92037
| | - Venkata Ramana Kotamraju
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA 92037
- Center for Nanomedicine and the Department of Cell, Molecular and Developmental Biology, University of California, Santa Barbara, CA, USA 93106
| | - Tarmo Mölder
- Laboratory of Cancer Biology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia 50411
| | - Allan Tobi
- Laboratory of Cancer Biology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia 50411
| | - Tambet Teesalu
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA 92037
- Center for Nanomedicine and the Department of Cell, Molecular and Developmental Biology, University of California, Santa Barbara, CA, USA 93106
- Laboratory of Cancer Biology, Institute of Biomedicine and Translational Medicine, University of Tartu, Tartu, Estonia 50411
| | - Erkki Ruoslahti
- Sanford-Burnham-Prebys Medical Discovery Institute, Cancer Research Center, La Jolla, CA, USA 92037
- Center for Nanomedicine and the Department of Cell, Molecular and Developmental Biology, University of California, Santa Barbara, CA, USA 93106
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2
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Wahyudi H, Reynolds AA, Li Y, Owen SC, Yu SM. Targeting collagen for diagnostic imaging and therapeutic delivery. J Control Release 2016; 240:323-331. [PMID: 26773768 PMCID: PMC4936964 DOI: 10.1016/j.jconrel.2016.01.007] [Citation(s) in RCA: 80] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 01/05/2016] [Accepted: 01/05/2016] [Indexed: 12/22/2022]
Abstract
As the most abundant protein in mammals and a major structural component in extracellular matrix, collagen holds a pivotal role in tissue development and maintaining the homeostasis of our body. Persistent disruption to the balance between collagen production and degradation can cause a variety of diseases, some of which can be fatal. Collagen remodeling can lead to either an overproduction of collagen which can cause excessive collagen accumulation in organs, common to fibrosis, or uncontrolled degradation of collagen seen in degenerative diseases such as arthritis. Therefore, the ability to monitor the state of collagen is crucial for determining the presence and progression of numerous diseases. This review discusses the implications of collagen remodeling and its detection methods with specific focus on targeting native collagens as well as denatured collagens. It aims to help researchers understand the pathobiology of collagen-related diseases and create novel collagen targeting therapeutics and imaging modalities for biomedical applications.
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Affiliation(s)
- Hendra Wahyudi
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
| | - Amanda A Reynolds
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
| | - Yang Li
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
| | - Shawn C Owen
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84112, USA
| | - S Michael Yu
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA.
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3
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Abd-Elgaliel WR, Tung CH. Exploring the structural requirements of collagen-binding peptides. Biopolymers 2016; 100:167-73. [PMID: 23436394 DOI: 10.1002/bip.22188] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 10/30/2012] [Accepted: 11/12/2012] [Indexed: 01/14/2023]
Abstract
Collagen synthesis and tissue remodeling are involved in many diseases; therefore, collagen-specific binding agents have been developed to study collagen changes in various tissues. Based on a recently reported collagen binding peptide, which contains unnatural biphenylalanine (Bip) amino acid residue, constructs with various structure variations were synthesized to explore the contributions of unnatural Bip residue, conformational restrain, and amino acid sequence in collagen recognition. Their binding efficiency to collagens was evaluated in vitro using pure collagens. The results indicate that the C-terminal unnatural Bip residue, rather than the peptide sequence or conformational restrain, dominated the collagen I binding. Subsequent tissue binding study showed that the selected peptide did not offer preferential selectivity over collagen I in tissue, suggesting that a simple in vitro binding assay cannot adequately model the complex biological environment.
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Affiliation(s)
- Wael R Abd-Elgaliel
- Department of Translational Imaging, Methodist Hospital Research Institute, Weill Cornell Medical College, Houston, TX
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4
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Schneider CS, Bhargav AG, Perez JG, Wadajkar AS, Winkles JA, Woodworth GF, Kim AJ. Surface plasmon resonance as a high throughput method to evaluate specific and non-specific binding of nanotherapeutics. J Control Release 2015; 219:331-344. [PMID: 26415854 DOI: 10.1016/j.jconrel.2015.09.048] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 09/22/2015] [Accepted: 09/24/2015] [Indexed: 12/18/2022]
Abstract
Surface plasmon resonance (SPR) is a powerful analytical technique used to quantitatively examine the interactions between various biomolecules, such as proteins and nucleic acids. The technique has been particularly useful in screening and evaluating binding affinity of novel small molecule and biomolecule-derived therapeutics for various diseases and applications including lupus medications, thrombin inhibitors, HIV protease inhibitors, DNA gyrase inhibitors and many others. Recently, there has been increasing interest in nanotherapeutics (nanoRx), due to their unique properties and potential for controlled release of encapsulated drugs and structure-specific targeting to diseased tissues. NanoRx offer the potential to solve many drug delivery challenges by enabling, specific interactions between molecules on the surface of the nanoparticle and molecules in the diseased tissue, while minimizing off-target interactions toward non-diseased tissues. These properties are largely dependent upon careful control and balance of nanoRx interactions and binding properties with tissues in vivo. Given the great promise of nanoRx with regard to engineering specific molecular interactions, SPR can rapidly quantify small aliquots of nanoRx formulations for desired and undesired molecular interactions. Moving forward, we believe that utilization of SPR in the screening and design of nanoRx has the potential to greatly improve the development of targeted nanoRx formulations and eventually lead to improved therapeutic efficacy. In this review, we discuss (1) the fundamental principles of SPR and basic quantitative analysis of SPR data, (2) previous applications of SPR in the study of non-particulate therapeutics and nanoRx, and (3) future opportunities for the use of SPR in the evaluation of nanoRx.
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Affiliation(s)
- Craig S Schneider
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Adip G Bhargav
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Jimena G Perez
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Aniket S Wadajkar
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Jeffrey A Winkles
- Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Surgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Graeme F Woodworth
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
| | - Anthony J Kim
- Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Marlene and Stewart Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Pharmaceutical Sciences, University of Maryland School of Pharmacy, Baltimore, MD 21201, USA; Center for Biomedical Engineering and Technology, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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Janssen BMG, van Ommeren SPFI, Merkx M. Efficient Synthesis of Peptide and Protein Functionalized Pyrrole-Imidazole Polyamides Using Native Chemical Ligation. Int J Mol Sci 2015; 16:12631-47. [PMID: 26053396 PMCID: PMC4490465 DOI: 10.3390/ijms160612631] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/25/2015] [Accepted: 05/28/2015] [Indexed: 01/02/2023] Open
Abstract
The advancement of DNA-based bionanotechnology requires efficient strategies to functionalize DNA nanostructures in a specific manner with other biomolecules, most importantly peptides and proteins. Common DNA-functionalization methods rely on laborious and covalent conjugation between DNA and proteins or peptides. Pyrrole-imidazole (Py-Im) polyamides, based on natural minor groove DNA-binding small molecules, can bind to DNA in a sequence specific fashion. In this study, we explore the use of Py-Im polyamides for addressing proteins and peptides to DNA in a sequence specific and non-covalent manner. A generic synthetic approach based on native chemical ligation was established that allows efficient conjugation of both peptides and recombinant proteins to Py-Im polyamides. The effect of Py-Im polyamide conjugation on DNA binding was investigated by Surface Plasmon Resonance (SPR). Although the synthesis of different protein-Py-Im-polyamide conjugates was successful, attenuation of DNA affinity was observed, in particular for the protein-Py-Im-polyamide conjugates. The practical use of protein-Py-Im-polyamide conjugates for addressing DNA structures in an orthogonal but non-covalent manner, therefore, remains to be established.
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Affiliation(s)
- Brian M G Janssen
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems, Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands.
| | - Sven P F I van Ommeren
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems, Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands.
| | - Maarten Merkx
- Laboratory of Chemical Biology and Institute for Complex Molecular Systems, Eindhoven University of Technology, Den Dolech 2, 5600 MB Eindhoven, The Netherlands.
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6
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Valetti S, Maione F, Mura S, Stella B, Desmaële D, Noiray M, Vergnaud J, Vauthier C, Cattel L, Giraudo E, Couvreur P. Peptide-functionalized nanoparticles for selective targeting of pancreatic tumor. J Control Release 2014; 192:29-39. [PMID: 24984010 DOI: 10.1016/j.jconrel.2014.06.039] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 06/20/2014] [Accepted: 06/21/2014] [Indexed: 12/22/2022]
Abstract
Chemotherapy for pancreatic cancer is hampered by the tumor's physio-pathological complexity. Here we show a targeted nanomedicine using a new ligand, the CKAAKN peptide, which had been identified by phage display, as an efficient homing device within the pancreatic pathological microenvironment. Taking advantage of the squalenoylation platform, the CKAAKN peptide was conjugated to squalene (SQCKAAKN) and then co-nanoprecipitated with the squalenoyl prodrug of gemcitabine (SQdFdC) giving near monodisperse nanoparticles (NPs) for safe intravenous injection. By interacting with a novel target pathway, the Wnt-2, the CKAAKN functionalization enabled nanoparticles: (i) to specifically interact with both tumor cells and angiogenic vessels and (ii) to simultaneously promote pericyte coverage, thus leading to the normalization of the vasculature likely improving the tumor accessibility for therapy. All together, this approach represents a unique targeted nanoparticle design with remarkable selectivity towards pancreatic cancer and multiple mechanisms of action.
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Affiliation(s)
- Sabrina Valetti
- Université Paris-Sud, Faculté de Pharmacie, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; CNRS UMR 8612, Institut Galien Paris-Sud, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; Department of Drug Science and Technology, University of Torino, 9 Via Pietro Giuria, 10125 Torino, Italy
| | - Federica Maione
- Laboratory of Transgenic Mouse Models, Candiolo Cancer Institute - FPO, IRCCS, Strada Provinciale 142, Km. 3.95, 10060 Candiolo (Torino), Italy
| | - Simona Mura
- Université Paris-Sud, Faculté de Pharmacie, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; CNRS UMR 8612, Institut Galien Paris-Sud, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Barbara Stella
- Department of Drug Science and Technology, University of Torino, 9 Via Pietro Giuria, 10125 Torino, Italy
| | - Didier Desmaële
- Université Paris-Sud, Faculté de Pharmacie, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; CNRS UMR 8612, Institut Galien Paris-Sud, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Magali Noiray
- Université Paris-Sud, Faculté de Pharmacie, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; CNRS UMR 8612, Institut Galien Paris-Sud, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Juliette Vergnaud
- Université Paris-Sud, Faculté de Pharmacie, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; CNRS UMR 8612, Institut Galien Paris-Sud, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Christine Vauthier
- Université Paris-Sud, Faculté de Pharmacie, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; CNRS UMR 8612, Institut Galien Paris-Sud, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France
| | - Luigi Cattel
- Department of Drug Science and Technology, University of Torino, 9 Via Pietro Giuria, 10125 Torino, Italy
| | - Enrico Giraudo
- Department of Drug Science and Technology, University of Torino, 9 Via Pietro Giuria, 10125 Torino, Italy; Laboratory of Transgenic Mouse Models, Candiolo Cancer Institute - FPO, IRCCS, Strada Provinciale 142, Km. 3.95, 10060 Candiolo (Torino), Italy
| | - Patrick Couvreur
- Université Paris-Sud, Faculté de Pharmacie, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France; CNRS UMR 8612, Institut Galien Paris-Sud, 5 Rue Jean-Baptiste Clément, 92296 Châtenay-Malabry Cedex, France.
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Abstract
PURPOSE OF REVIEW Functional and molecular aortic imaging has shown great promise for evaluation of aortic disease, and may soon augment conventional assessment of aortic dimensions for the clinical management of patients. RECENT FINDINGS A range of imaging techniques is available for evaluation of patients with aortic disease. Magnetic resonance blood flow imaging can identify atherosclerosis prone aortic regions and may be useful for predicting aneurysm growth. Computational modeling can demonstrate significant differences in wall stress between abdominal aortic aneurysms of similar size and may better predict rupture than diameter alone. Metabolic imaging with fluorodeoxyglucose-PET [(FDG)-PET] can identify focal aortic wall inflammation that may portend rapid progression of disease. Molecular imaging with probes that target collagen and elastin can directly exhibit changes in the vessel wall associated with disease. SUMMARY The complexity of aortic disease is more fully revealed with new functional imaging techniques than with conventional anatomic analysis alone. This may better inform surveillance imaging regimens, medical management and decisions regarding early intervention for aortic disease.
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Haji-Valizadeh H, Modery-Pawlowski CL, Sen Gupta A. A factor VIII-derived peptide enables von Willebrand factor (VWF)-binding of artificial platelet nanoconstructs without interfering with VWF-adhesion of natural platelets. NANOSCALE 2014; 6:4765-73. [PMID: 24658160 PMCID: PMC4300948 DOI: 10.1039/c3nr06400j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
There is substantial clinical interest in synthetic platelet analogs for potential application in transfusion medicine. To this end, our research is focused on self-assembled peptide-lipid nanoconstructs that can undergo injury site-selective adhesion and subsequently promote site-directed active platelet aggregation, thus mimicking platelet's primary hemostatic actions. For injury site-selective adhesion, we have utilized a coagulation factor FVIII-derived VWF-binding peptide (VBP). FVIII binds to VWF's D'-D3 domain while natural platelet GPIbα binds to VWF's A1 domain. Therefore, we hypothesized that the VBP-decorated nanoconstructs will adhere to VWF without mutual competition with natural platelets. We further hypothesized that the adherent VBP-decorated constructs can enhance platelet aggregation when co-decorated with a fibrinogen-mimetic peptide (FMP). To test these hypotheses, we used glycocalicin to selectively block VWF's A1 domain and, using fluorescence microscopy, studied the binding of fluorescently labeled VBP-decorated nanoconstructs versus platelets to ristocetin-treated VWF. Subsequently, we co-decorated the nanoconstructs with VBP and FMP and incubated them with human platelets to study construct-mediated enhancement of platelet aggregation. Decoration with VBP resulted in substantial construct adhesion to ristocetin-treated VWF even if the A1-domain was blocked by glycocalicin. In comparison, such A1-blocking resulted in significant reduction of platelet adhesion. Without A1-blocking, the VBP-decorated constructs and natural platelets could adhere to VWF concomitantly. Furthermore, the constructs co-decorated with VBP and FMP enhanced active platelet aggregation. The results indicate significant promise in utilizing the FVIII-derived VBP in developing synthetic platelet analogs that do not interfere with VWF-binding of natural platelets but allow site-directed enhancement of platelet aggregation when combined with FMP.
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Affiliation(s)
- Hassan Haji-Valizadeh
- Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA.
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9
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Tang W, Becker ML. “Click” reactions: a versatile toolbox for the synthesis of peptide-conjugates. Chem Soc Rev 2014; 43:7013-39. [DOI: 10.1039/c4cs00139g] [Citation(s) in RCA: 271] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Peptides that comprise the functional subunits of proteins have been conjugated to versatile materials (biomolecules, polymers, surfaces and nanoparticles) in an effort to modulate cell responses, specific binding affinity and/or self-assembly behavior.
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Affiliation(s)
- Wen Tang
- Department of Polymer Science
- The University of Akron
- Akron, USA
| | - Matthew L. Becker
- Department of Polymer Science
- The University of Akron
- Akron, USA
- Department of Biomedical Engineering
- The University of Akron
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10
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Valetti S, Mura S, Stella B, Couvreur P. Rational design for multifunctional non-liposomal lipid-based nanocarriers for cancer management: theory to practice. J Nanobiotechnology 2013; 11 Suppl 1:S6. [PMID: 24564841 PMCID: PMC4029540 DOI: 10.1186/1477-3155-11-s1-s6] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Nanomedicines have gained more and more attention in cancer therapy thanks to their ability to enhance the tumour accumulation and the intracellular uptake of drugs while reducing their inactivation and toxicity. In parallel, nanocarriers have been successfully employed as diagnostic tools increasing imaging resolution holding great promises both in preclinical research and in clinical settings. Lipid-based nanocarriers are a class of biocompatible and biodegradable vehicles that provide advanced delivery of therapeutic and imaging agents, improving pharmacokinetic profile and safety. One of most promising engineering challenges is the design of innovative and versatile multifunctional targeted nanotechnologies for cancer treatment and diagnosis. This review aims to highlight rational approaches to design multifunctional non liposomal lipid-based nanocarriers providing an update of literature in this field.
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11
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Li Y, Yu SM. Targeting and mimicking collagens via triple helical peptide assembly. Curr Opin Chem Biol 2013; 17:968-75. [PMID: 24210894 DOI: 10.1016/j.cbpa.2013.10.018] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 10/11/2013] [Accepted: 10/14/2013] [Indexed: 12/29/2022]
Abstract
As the major structural component of the extracellular matrix, collagen plays a crucial role in tissue development and regeneration. Since structural and metabolic abnormalities of collagen are associated with numerous debilitating diseases and pathologic conditions, the ability to target collagens of diseased tissues could lead to new diagnostics and therapeutics. Collagen is also a natural biomaterial widely used in drug delivery and tissue engineering, and construction of synthetic collagen-like materials is gaining interests in the biomaterials community. The unique triple helical structure of collagen has been explored for targeting collagen strands, and for engineering collagen-like functional assemblies and conjugates. This review focuses on the forefront of research activities in the use of the collagen mimetic peptide for both targeting and mimicking collagens via its triple helix mediated strand hybridization and higher order assembly.
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Affiliation(s)
- Yang Li
- Department of Bioengineering, University of Utah, Salt Lake City, UT 84112, USA
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12
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Abstract
Linear polymers have been considered the best molecular structures for the formation of efficient protein conjugates due to their biological advantages, synthetic convenience and ease of functionalization. In recent years, much attention has been dedicated to develop synthetic strategies that produce the most control over protein conjugation utilizing linear polymers as scaffolds. As a result, different conjugate models, such as semitelechelic, homotelechelic, heterotelechelic and branched or star polymer conjugates, have been obtained that take advantage of these well-controlled synthetic strategies. Development of protein conjugates using nanostructures and the formation of said nanostructures from protein-polymer bioconjugates are other areas in the protein bioconjugation field. Although several polymer-protein technologies have been developed from these discoveries, few review articles have focused on the design and function of these polymers and nanostructures. This review will highlight some recent advances in protein-linear polymer technologies that employ protein covalent conjugation and successful protein-nanostructure bioconjugates (covalent conjugation as well) that have shown great potential for biological applications.
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13
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Silpe JE, Sumit M, Thomas TP, Huang B, Kotlyar A, van Dongen MA, Banaszak Holl MM, Orr BG, Choi SK. Avidity modulation of folate-targeted multivalent dendrimers for evaluating biophysical models of cancer targeting nanoparticles. ACS Chem Biol 2013; 8:2063-71. [PMID: 23855478 DOI: 10.1021/cb400258d] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
We investigated two types of generation 5 polyamidoamine (PAMAM) dendrimers, each conjugated stochastically with a mean number of 5 or 10 methotrexate (MTX) ligands per dendrimer (G5-MTX5, G5-MTX10), for their binding to surface-immobilized folate binding protein (FBP) as a function of receptor density. The binding study was performed under flow by surface plasmon resonance spectroscopy. Two multivalent models were examined to simulate binding of the dendrimer to the receptor surface, showing that at relatively high receptor density, both dendrimer conjugates exhibit high avidity. However, upon reducing the receptor density by a factor of 3 and 13 relative to the high density level, the avidity of the lower-valent G5-MTX5 decreases by up to several orders of magnitude (KD = nM to μM), whereas the avidity of G5-MTX10 remains largely unaffected regardless of the density variation. Notably, on the 13-fold reduced FBP surface, G5-MTX5 displays binding kinetics similar to that of monovalent methotrexate, which is patently different from the still tight binding of the higher-valent G5-MTX10. Thus, the binding analysis demonstrates that avidity displayed by multivalent MTX conjugates varies in response to the receptor density and can be modulated for achieving tighter, more specific binding to the higher receptor density by modulation of ligand valency. We believe this study provides experimental evidence supportive of the mechanistic hypothesis of multivalent NP uptake to a cancer cell over a healthy cell where the diseased cell expresses the folate receptor at higher density.
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Affiliation(s)
- Justin E. Silpe
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Madhuresh Sumit
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Thommey P. Thomas
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Baohua Huang
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Alina Kotlyar
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Mallory A. van Dongen
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Mark M. Banaszak Holl
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Bradford G. Orr
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
| | - Seok Ki Choi
- Michigan
Nanotechnology Institute for Medicine and Biological Sciences, ‡Macromolecular Science
and Engineering, §Program in Biomedical Sciences, ∥Department of Internal Medicine, ⊥Department of Chemistry, and #Department of Physics, University of Michigan, Ann Arbor, Michigan
48109, United States
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Tanwir K, Shahid MN, Thomas A, Tsoukanova V. Coexisting phases in PEGylated phosphocholine membranes: a model study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:14000-14009. [PMID: 22954402 DOI: 10.1021/la302156x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Understanding the phase behavior of PEGylated phosphocholine membranes is becoming increasingly important in many biomedical applications. Here, we used binary mixtures of phosphocholines and PEG-phospholipids in monolayers on phosphate buffered saline as ideal models of PEGylated phosphocholine membranes. Several phase states and transitions between homogeneously mixed and completely immiscible phases have been visualized in these mixtures by epifluorescence microscopy, which is neither predicted nor easily explained by the existing interpretive schemes. The results of our study suggest that the phase state of PEGylated phosphocholine membranes may drastically vary depending on factors such as aliphatic chain length on phosphocholines and PEG-phospholipids, PEG content, and temperature. These findings are summarized in phase drawings and diagrams to demonstrate a striking variety of possible phases. The diagrams can also be instrumental in predicting the phase state of PEGylated phosphocholine membranes, in particular under physiological conditions.
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Affiliation(s)
- Kanwal Tanwir
- Department of Chemistry, York University, Toronto, ON, Canada
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15
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Quillard T, Libby P. Molecular imaging of atherosclerosis for improving diagnostic and therapeutic development. Circ Res 2012; 111:231-44. [PMID: 22773426 DOI: 10.1161/circresaha.112.268144] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Despite recent progress, cardiovascular and allied metabolic disorders remain a worldwide health challenge. We must identify new targets for therapy, develop new agents for clinical use, and deploy them in a clinically effective and cost-effective manner. Molecular imaging of atherosclerotic lesions has become a major experimental tool in the last decade, notably by providing a direct gateway to the processes involved in atherogenesis and its complications. This review summarizes the current status of molecular imaging approaches that target the key processes implicated in plaque formation, development, and disruption and highlights how the refinement and application of such tools might aid the development and evaluation of novel therapeutics.
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Affiliation(s)
- Thibaut Quillard
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
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16
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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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17
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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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18
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Hassouneh W, Fischer K, MacEwan SR, Branscheid R, Fu CL, Liu R, Schmidt M, Chilkoti A. Unexpected Multivalent Display of Proteins by Temperature Triggered Self-Assembly of Elastin-like Polypeptide Block Copolymers. Biomacromolecules 2012; 13:1598-605. [DOI: 10.1021/bm300321n] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Wafa Hassouneh
- Department of Biomedical
Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Karl Fischer
- Institute of Physical
Chemistry, Johannes Gutenberg University, Mainz, Germany 55099
| | - Sarah R. MacEwan
- Department of Biomedical
Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Robert Branscheid
- Institute of Physical
Chemistry, Johannes Gutenberg University, Mainz, Germany 55099
| | - Chuan Lawrence Fu
- Eshelman School of
Pharmacy and Carolina Center for Genome Sciences, University of North Carolina, Chapel
Hill, North Carolina 27599, United States
| | - Rihe Liu
- Eshelman School of
Pharmacy and Carolina Center for Genome Sciences, University of North Carolina, Chapel
Hill, North Carolina 27599, United States
| | - Manfred Schmidt
- Institute of Physical
Chemistry, Johannes Gutenberg University, Mainz, Germany 55099
| | - Ashutosh Chilkoti
- Department of Biomedical
Engineering, Duke University, Durham, North Carolina 27708, United States
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19
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Hope TA, Hope MD. Improved risk assessment for abdominal aortic aneurysm rupture: off-the-wall imaging. J Am Coll Cardiol 2012; 58:2531-2. [PMID: 22133854 DOI: 10.1016/j.jacc.2011.09.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2011] [Accepted: 09/12/2011] [Indexed: 11/26/2022]
Affiliation(s)
- Thomas A Hope
- Department of Radiology and Biomedical Imaging, University of California-San Francisco, CA, USA
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20
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Algar WR, Prasuhn DE, Stewart MH, Jennings TL, Blanco-Canosa JB, Dawson PE, Medintz IL. The controlled display of biomolecules on nanoparticles: a challenge suited to bioorthogonal chemistry. Bioconjug Chem 2011; 22:825-58. [PMID: 21585205 DOI: 10.1021/bc200065z] [Citation(s) in RCA: 352] [Impact Index Per Article: 27.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Interest in developing diverse nanoparticle (NP)-biological composite materials continues to grow almost unabated. This is motivated primarily by the desire to simultaneously exploit the properties of both NP and biological components in new hybrid devices or materials that can be applied in areas ranging from energy harvesting and nanoscale electronics to biomedical diagnostics. The utility and effectiveness of these composites will be predicated on the ability to assemble these structures with control over NP/biomolecule ratio, biomolecular orientation, biomolecular activity, and the separation distance within the NP-bioconjugate architecture. This degree of control will be especially critical in creating theranostic NP-bioconjugates that, as a single vector, are capable of multiple functions in vivo, including targeting, image contrast, biosensing, and drug delivery. In this review, a perspective is given on current and developing chemistries that can provide improved control in the preparation of NP-bioconjugates. The nanoscale properties intrinsic to several prominent NP materials are briefly described to highlight the motivation behind their use. NP materials of interest include quantum dots, carbon nanotubes, viral capsids, liposomes, and NPs composed of gold, lanthanides, silica, polymers, or magnetic materials. This review includes a critical discussion on the design considerations for NP-bioconjugates and the unique challenges associated with chemistry at the biological-nanoscale interface-the liabilities of traditional bioconjugation chemistries being particularly prominent therein. Select bioorthogonal chemistries that can address these challenges are reviewed in detail, and include chemoselective ligations (e.g., hydrazone and Staudinger ligation), cycloaddition reactions in click chemistry (e.g., azide-alkyne cyclyoaddition, tetrazine ligation), metal-affinity coordination (e.g., polyhistidine), enzyme driven modifications (e.g., HaloTag, biotin ligase), and other site-specific chemistries. The benefits and liabilities of particular chemistries are discussed by highlighting relevant NP-bioconjugation examples from the literature. Potential chemistries that have not yet been applied to NPs are also discussed, and an outlook on future developments in this field is given.
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Affiliation(s)
- W Russ Algar
- Center for Bio/Molecular Science and Engineering, Optical Sciences Division, U.S. Naval Research Laboratory, 4555 Overlook Avenue S.W., Washington, DC 20375, United States
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21
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Singh AN, Liu W, Hao G, Kumar A, Gupta A, Öz OK, Hsieh JT, Sun X. Multivalent bifunctional chelator scaffolds for gallium-68 based positron emission tomography imaging probe design: signal amplification via multivalency. Bioconjug Chem 2011; 22:1650-62. [PMID: 21740059 DOI: 10.1021/bc200227d] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The role of the multivalent effect has been well recognized in the design of molecular imaging probes toward the desired imaging signal amplification. Recently, we reported a bifunctional chelator (BFC) scaffold design, which provides a simple and versatile approach to impart multivalency to radiometal based nuclear imaging probes. In this work, we report a series of BFC scaffolds ((t)Bu(3)-1-COOH, (t)Bu(3)-2-(COOH)(2), and (t)Bu(3)-3-(COOH)(3)) constructed on the framework of 1,4,7-triazacyclononane-1,4,7-triacetic acid (NOTA) for (68)Ga-based PET probe design and signal amplification via the multivalent effect. For proof of principle, a known integrin α(v)β(3) specific ligand (c(RGDyK)) was used to build the corresponding NOTA conjugates (H(3)1, H(3)2, and H(3)3), which present 1-3 copies of c(RGDyK) peptide, respectively, in a systematic manner. Using the integrin α(v)β(3) binding affinities (IC(50) values), enhanced specific binding was observed for multivalent conjugates (H(3)2: 43.9 ± 16.1 nM; H(3)3: 14.7 ± 5.0 nM) as compared to their monovalent counterpart (H(3)1: 171 ± 60 nM) and the intact c(RGDyK) peptide (204 ± 76 nM). The obtained conjugates were efficiently labeled with (68)Ga(3+) within 30 min at room temperature in high radiochemical yields (>95%). The in vivo evaluation of the labeled conjugates, (68)Ga-1, (68)Ga-2, and (68)Ga-3, was performed using male severe combined immunodeficiency (SCID) mice bearing integrin α(v)β(3) positive PC-3 tumor xenografts (n = 3). All (68)Ga-labeled conjugates showed high in vivo stability with no detectable metabolites found by radio-HPLC within 2 h postinjection (p.i.). The PET signal amplification in PC-3 tumor by the multivalent effect was clearly displayed by the tumor uptake of the (68)Ga-labeled conjugates ((68)Ga-3: 2.55 ± 0.50%ID/g; (68)Ga-2: 1.90 ± 0.10%ID/g; (68)Ga-1: 1.66 ± 0.15%ID/g) at 2 h p.i. In summary, we have designed and synthesized a series of NOTA-based BFC scaffolds with signal amplification properties, which may find potential applications as diagnostic gallium radiopharmaceuticals.
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Affiliation(s)
- Ajay N Singh
- Department of Radiology, University of Texas Southwestern Medical Center, Dallas, Texas, United States
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22
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Bastings MMC, Helms BA, van Baal I, Hackeng TM, Merkx M, Meijer EW. From phage display to dendrimer display: insights into multivalent binding. J Am Chem Soc 2011; 133:6636-41. [PMID: 21473586 DOI: 10.1021/ja110700x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Phage display is widely used for the selection of target-specific peptide sequences. Presentation of phage peptides on a multivalent platform can be used to (partially) restore the binding affinity. Here, we present a detailed analysis of the effects of valency, linker choice, and receptor density on binding affinity of a multivalent architecture, using streptavidin (SA) as model multivalent receptor. For surfaces with low receptor densities, the SA binding affinity of multivalent dendritic phage peptide constructs increases over 2 orders of magnitude over the monovalent species (e.g., K(d,mono) = 120 μM vs K(d,tetra) = 1 μM), consistent with previous work. However, the affinity of the SA-binding phage presenting the exact same peptides was 16 pM when dense receptor surfaces used for initial phage display were used in assays. The phage affinity for SA-coated surfaces weakens severely toward the nanomolar regime when surface density of SA is decreased. A similarly strong dependence in this respect was observed for dendritic phage analogues. When presented with a dense SA-coated surface, dendrimer display affords up to a 10(4)-fold gain in affinity over the monovalent peptide. The interplay between ligand valency and receptor density is a fundamental aspect of multivalent targeting strategies in biological systems. The perspective offered here suggests that in vivo targeting schemes might best be served to conduct ligand selection under physiologically relevant receptor density surfaces, either by controlling the receptor density placed at the selection surface or by using more biologically relevant intact cells and tissues.
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Affiliation(s)
- Maartje M C Bastings
- Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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23
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Collagen targeting using multivalent protein-functionalized dendrimers. Bioorg Med Chem 2011; 19:1062-71. [DOI: 10.1016/j.bmc.2010.07.058] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2010] [Revised: 07/08/2010] [Accepted: 07/26/2010] [Indexed: 12/22/2022]
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24
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Hernández-Rocamora VM, Reulen SWA, de Waal B, Meijer EW, Sanz JM, Merkx M. Choline dendrimers as generic scaffolds for the non-covalent synthesis of multivalent protein assemblies. Chem Commun (Camb) 2011; 47:5997-9. [DOI: 10.1039/c0cc05605g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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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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26
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Breurken M, Lempens EHM, Meijer EW, Merkx M. Semi-synthesis of a protease-activatable collagen targeting probe. Chem Commun (Camb) 2011; 47:7998-8000. [DOI: 10.1039/c1cc11964h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Breurken M, Lempens EHM, Merkx M. Protease-activatable collagen targeting based on protein cyclization. Chembiochem 2010; 11:1665-8. [PMID: 20589824 DOI: 10.1002/cbic.201000223] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Monika Breurken
- Laboratory for Chemical Biology, Department of Biomedical Engineering, Eindhoven University of Technology, 5600 MB, Eindhoven, the Netherlands
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28
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Reulen SWA, Merkx M. Exchange kinetics of protein-functionalized micelles and liposomes studied by Förster resonance energy transfer. Bioconjug Chem 2010; 21:860-6. [PMID: 20397687 DOI: 10.1021/bc900398p] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Protein-functionalized micelles and liposomes are attractive delivery systems for applications ranging from targeted drug delivery to molecular imaging. In particular, systems that use pegylated phospholipids have become popular, but little is known about the stability of these lipid-functionalized proteins toward exchange. In this study, Förster resonance energy transfer (FRET) between the fluorescent proteins ECFP and EYFP was used to investigate the lipid exchange behavior of protein-functionalized liposomes and micelles. Native chemical ligation was used as an efficient method to site-specifically couple varying amounts of proteins to pegylated phospholipids. No exchange was observed between protein-functionalized phospholipids in sterically stabilized liposomes. In micelles, however, protein-functionalized lipids were found to exchange with a half-time of exchange ranging from almost 2 h at room temperature to 4 min at 37 degrees C. These pegylated micelles remained intact at lipid concentrations down to 0.15 microM, indicating that they are even more stable than previously assumed. The results obtained in this study provide a useful frame of reference for assessing the potential role of protein exchange in biomedical applications of these lipid-based nanoparticles.
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Affiliation(s)
- Sanne W A Reulen
- Laboratory of Chemical Biology, Department of Biomedical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
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29
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Abstract
The various types of cells that comprise the tumor mass all carry molecular markers that are not expressed or are expressed at much lower levels in normal cells. These differentially expressed molecules can be used as docking sites to concentrate drug conjugates and nanoparticles at tumors. Specific markers in tumor vessels are particularly well suited for targeting because molecules at the surface of blood vessels are readily accessible to circulating compounds. The increased concentration of a drug in the site of disease made possible by targeted delivery can be used to increase efficacy, reduce side effects, or achieve some of both. We review the recent advances in this delivery approach with a focus on the use of molecular markers of tumor vasculature as the primary target and nanoparticles as the delivery vehicle.
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Affiliation(s)
- Erkki Ruoslahti
- Vascular Mapping Center, Sanford-Burnham Medical Research Institute, University of California, Santa Barbara, Santa Barbara, CA 93106, USA.
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30
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Posocco P, Pricl S, Jones S, Barnard A, Smith DK. Less is more – multiscale modelling of self-assembling multivalency and its impact on DNA binding and gene delivery. Chem Sci 2010. [DOI: 10.1039/c0sc00291g] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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31
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Reulen SWA, van Baal I, Raats JMH, Merkx M. Efficient, chemoselective synthesis of immunomicelles using single-domain antibodies with a C-terminal thioester. BMC Biotechnol 2009; 9:66. [PMID: 19619333 PMCID: PMC2719619 DOI: 10.1186/1472-6750-9-66] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Accepted: 07/20/2009] [Indexed: 01/24/2023] Open
Abstract
Background Classical bioconjugation strategies for generating antibody-functionalized nanoparticles are non-specific and typically result in heterogeneous compounds that can be compromised in activity. Expression systems based on self-cleavable intein domains allow the generation of recombinant proteins with a C-terminal thioester, providing a unique handle for site-specific conjugation using native chemical ligation (NCL). However, current methods to generate antibody fragments with C-terminal thioesters require cumbersome refolding procedures, effectively preventing application of NCL for antibody-mediated targeting and molecular imaging. Results Targeting to the periplasm of E. coli allowed efficient production of correctly-folded single-domain antibody (sdAb)-intein fusions proteins. On column purification and 2-mercapthoethanesulfonic acid (MESNA)-induced cleavage yielded single-domain antibodies with a reactive C-terminal MESNA thioester in good yields. These thioester-functionalized single-domain antibodies allowed synthesis of immunomicelles via native chemical ligation in a single step. Conclusion A novel procedure was developed to obtain soluble, well-folded single-domain antibodies with reactive C-terminal thioesters in good yields. These proteins are promising building blocks for the chemoselective functionalization via NCL of a broad range of nanoparticle scaffolds, including micelles, liposomes and dendrimers.
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Affiliation(s)
- Sanne W A Reulen
- Laboratory of Chemical Biology, Department of Biomedical Engineering, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, the Netherlands.
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