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Abstract
Carbohydrates are the most abundant and one of the most important biomacromolecules in Nature. Except for energy-related compounds, carbohydrates can be roughly divided into two categories: Carbohydrates as matter and carbohydrates as information. As matter, carbohydrates are abundantly present in the extracellular matrix of animals and cell walls of various plants, bacteria, fungi, etc., serving as scaffolds. Some commonly found polysaccharides are featured as biocompatible materials with controllable rigidity and functionality, forming polymeric biomaterials which are widely used in drug delivery, tissue engineering, etc. As information, carbohydrates are usually referred to the glycans from glycoproteins, glycolipids, and proteoglycans, which bind to proteins or other carbohydrates, thereby meditating the cell-cell and cell-matrix interactions. These glycans could be simplified as synthetic glycopolymers, glycolipids, and glycoproteins, which could be afforded through polymerization, multistep synthesis, or a semisynthetic strategy. The information role of carbohydrates can be demonstrated not only as targeting reagents but also as immune antigens and adjuvants. The latter are also included in this review as they are always in a macromolecular formulation. In this review, we intend to provide a relatively comprehensive summary of carbohydrate-based macromolecular biomaterials since 2010 while emphasizing the fundamental understanding to guide the rational design of biomaterials. Carbohydrate-based macromolecules on the basis of their resources and chemical structures will be discussed, including naturally occurring polysaccharides, naturally derived synthetic polysaccharides, glycopolymers/glycodendrimers, supramolecular glycopolymers, and synthetic glycolipids/glycoproteins. Multiscale structure-function relationships in several major application areas, including delivery systems, tissue engineering, and immunology, will be detailed. We hope this review will provide valuable information for the development of carbohydrate-based macromolecular biomaterials and build a bridge between the carbohydrates as matter and the carbohydrates as information to promote new biomaterial design in the near future.
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Affiliation(s)
- Lu Su
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China.,Institute for Complex Molecular Systems, Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, Eindhoven 5600, The Netherlands
| | - Yingle Feng
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China.,Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education and School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an, Shaanxi 710119, P. R. China
| | - Kongchang Wei
- Empa, Swiss Federal Laboratories for Materials Science and Technology, Department of Materials meet Life, Laboratory for Biomimetic Membranes and Textiles, Lerchenfeldstrasse 5, St. Gallen 9014, Switzerland
| | - Xuyang Xu
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Rongying Liu
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China
| | - Guosong Chen
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, China.,Multiscale Research Institute of Complex Systems, Fudan University, Shanghai 200433, China
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Namdee K, Sobczynski DJ, Onyskiw PJ, Eniola-Adefeso O. Differential Impact of Plasma Proteins on the Adhesion Efficiency of Vascular-Targeted Carriers (VTCs) in Blood of Common Laboratory Animals. Bioconjug Chem 2015; 26:2419-28. [PMID: 26505780 PMCID: PMC4866610 DOI: 10.1021/acs.bioconjchem.5b00474] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Vascular-targeted carrier (VTC) interaction with human plasma is known to reduce targeted adhesion efficiency in vitro. However, the role of plasma proteins on the adhesion efficiency of VTCs in laboratory animals remains unknown. Here, in vitro blood flow assays are used to explore the effects of plasma from mouse, rabbit, and porcine on VTC adhesion. Porcine blood exhibited a strong negative plasma effect on VTC adhesion while no significant plasma effect was found with rabbit and mouse blood. A brush density poly(ethylene glycol) (PEG) on VTCs was effective at improving adhesion of microsized, but not nanosized, VTCs in porcine blood. Overall, the results suggest that porcine models, as opposed to mouse, can serve as better models in preclinical research for predicting the in vivo functionality of VTCs for use in humans. These considerations hold great importance for the design of various pharmaceutical products and development of reliable drug delivery systems.
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Affiliation(s)
| | | | - Peter J. Onyskiw
- Department of Chemical Engineering, University of Michigan, 2800 Plymouth Road, Ann Arbor, MI, 48109
| | - Omolola Eniola-Adefeso
- Department of Chemical Engineering, University of Michigan, 2800 Plymouth Road, Ann Arbor, MI, 48109
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3
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Effects of Atorvastatin on E-Selectin and Myeloperoxidase Expressions after Cerebral Ischemia-Reperfusion Injury in Rats. NEUROPHYSIOLOGY+ 2014. [DOI: 10.1007/s11062-014-9452-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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4
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Seifman MA, Gomes K, Nguyen PN, Bailey M, Rosenfeld JV, Cooper DJ, Morganti-Kossmann MC. Measurement of serum melatonin in intensive care unit patients: changes in traumatic brain injury, trauma, and medical conditions. Front Neurol 2014; 5:237. [PMID: 25477861 PMCID: PMC4235080 DOI: 10.3389/fneur.2014.00237] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 11/01/2014] [Indexed: 12/16/2022] Open
Abstract
Melatonin is an endogenous hormone mainly produced by the pineal gland whose dysfunction leads to abnormal sleeping patterns. Changes in melatonin have been reported in acute traumatic brain injury (TBI); however, the impact of environmental conditions typical of the intensive care unit (ICU) has not been assessed. The aim of this study was to compare daily melatonin production in three patient populations treated at the ICU to differentiate the role of TBI versus ICU conditions. Forty-five patients were recruited and divided into severe TBI, trauma without TBI, medical conditions without trauma, and compared to healthy volunteers. Serum melatonin levels were measured at four daily intervals at 0400 h, 1000 h, 1600 h, and 2200 h for 7 days post-ICU admission by commercial enzyme linked immunosorbent assay. The geometric mean concentrations (95% confidence intervals) of melatonin in these groups showed no difference being 8.3 (6.3–11.0), 9.3 (7.0–12.3), and 8.9 (6.6–11.9) pg/mL, respectively, in TBI, trauma, and intensive care cohorts. All of these patient groups demonstrated decreased melatonin concentrations when compared to control patients. This study suggests that TBI as well as ICU conditions, may have a role in the dysfunction of melatonin. Monitoring and possibly substituting melatonin acutely in these settings may assist in ameliorating long-term sleep dysfunction in all of these groups, and possibly contribute to reducing secondary brain injury in severe TBI.
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Affiliation(s)
- Marc A Seifman
- National Trauma Research Institute, The Alfred , Melbourne, VIC , Australia ; Department of Surgery, Monash University , Melbourne, VIC , Australia ; Department of Neurosurgery, The Alfred , Melbourne, VIC , Australia
| | - Keith Gomes
- National Trauma Research Institute, The Alfred , Melbourne, VIC , Australia ; Department of Neurosurgery, The Alfred , Melbourne, VIC , Australia
| | - Phuong N Nguyen
- National Trauma Research Institute, The Alfred , Melbourne, VIC , Australia
| | - Michael Bailey
- Department of Epidemiology, Monash University , Melbourne, VIC , Australia ; Australian New Zealand Intensive Care Research Centre , Melbourne, VIC , Australia
| | - Jeffrey V Rosenfeld
- Department of Surgery, Monash University , Melbourne, VIC , Australia ; Department of Neurosurgery, The Alfred , Melbourne, VIC , Australia
| | - David J Cooper
- Department of Epidemiology, Monash University , Melbourne, VIC , Australia ; Australian New Zealand Intensive Care Research Centre , Melbourne, VIC , Australia ; Intensive Care Unit, The Alfred , Melbourne, VIC , Australia
| | - Maria Cristina Morganti-Kossmann
- Department of Epidemiology, Monash University , Melbourne, VIC , Australia ; Australian New Zealand Intensive Care Research Centre , Melbourne, VIC , Australia ; Department of Child Health, Barrow Neurological Institute, University of Arizona , Phoenix, AZ , USA
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Sobczynski DJ, Charoenphol P, Heslinga MJ, Onyskiw PJ, Namdee K, Thompson AJ, Eniola-Adefeso O. Plasma protein corona modulates the vascular wall interaction of drug carriers in a material and donor specific manner. PLoS One 2014; 9:e107408. [PMID: 25229244 PMCID: PMC4168002 DOI: 10.1371/journal.pone.0107408] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 08/09/2014] [Indexed: 01/23/2023] Open
Abstract
The nanoscale plasma protein interaction with intravenously injected particulate carrier systems is known to modulate their organ distribution and clearance from the bloodstream. However, the role of this plasma protein interaction in prescribing the adhesion of carriers to the vascular wall remains relatively unknown. Here, we show that the adhesion of vascular-targeted poly(lactide-co-glycolic-acid) (PLGA) spheres to endothelial cells is significantly inhibited in human blood flow, with up to 90% reduction in adhesion observed relative to adhesion in simple buffer flow, depending on the particle size and the magnitude and pattern of blood flow. This reduced PLGA adhesion in blood flow is linked to the adsorption of certain high molecular weight plasma proteins on PLGA and is donor specific, where large reductions in particle adhesion in blood flow (>80% relative to buffer) is seen with ∼60% of unique donor bloods while others exhibit moderate to no reductions. The depletion of high molecular weight immunoglobulins from plasma is shown to successfully restore PLGA vascular wall adhesion. The observed plasma protein effect on PLGA is likely due to material characteristics since the effect is not replicated with polystyrene or silica spheres. These particles effectively adhere to the endothelium at a higher level in blood over buffer flow. Overall, understanding how distinct plasma proteins modulate the vascular wall interaction of vascular-targeted carriers of different material characteristics would allow for the design of highly functional delivery vehicles for the treatment of many serious human diseases.
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Affiliation(s)
- Daniel J. Sobczynski
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Phapanin Charoenphol
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Michael J. Heslinga
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Peter J. Onyskiw
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Katawut Namdee
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Alex J. Thompson
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Omolola Eniola-Adefeso
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America
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Lauryl-poly-L-lysine: A New Antimicrobial Agent? JOURNAL OF AMINO ACIDS 2014; 2014:672367. [PMID: 24660058 PMCID: PMC3934720 DOI: 10.1155/2014/672367] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/14/2013] [Accepted: 01/14/2014] [Indexed: 11/18/2022]
Abstract
The development of multiple antibiotic resistance is a global problem. It is necessary to find new tools whose mechanisms of action differ from those of currently used antibiotics. It is known that fatty acids and cationic polypeptides are able to fight bacteria. Here, we describe the synthesis of fatty acids linked to a polypeptide with antibacterial activity. The linkage of fatty acids to a polypeptide is reported to increase the antibacterial effect of the linked fatty acid in comparison with free fatty acids (FA) or free poly-L-lysine (PLL) or a mixture of both (FA free + PLL free). A number of C6-C18 fatty acids were linked to PLL to obtain new synthetic products. These compounds were assessed in vitro to evaluate their antibacterial activity. Some fatty acid-PLLs showed a good ability to fight bacteria. Their bactericidal activity was evaluated, and, lauryl linked to PLL was found to be the most active product against both Gram-positive and Gram-negative bacteria. This new active component showed a good degree of specificity and reproducibility and its minimum inhibitory concentration (MIC) was comparatively good. The antibacterial activity of the lauryl-PLL compound suggests that it is a new and promising antimicrobial agent.
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Peptide Scaffolds: Flexible Molecular Structures With Diverse Therapeutic Potentials. Int J Pept Res Ther 2012. [DOI: 10.1007/s10989-011-9286-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Khandare J, Calderón M, Dagia NM, Haag R. Multifunctional dendritic polymers in nanomedicine: opportunities and challenges. Chem Soc Rev 2011; 41:2824-48. [PMID: 22158998 DOI: 10.1039/c1cs15242d] [Citation(s) in RCA: 319] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nanotechnology has resulted in materials that have greatly improved the effectiveness of drug delivery because of their ability to control matter on the nanoscale. Advanced forms of nanomedicine have been synthesized for better pharmacokinetics to obtain higher efficacy, less systemic toxicity, and better targeting. These criteria have long been the goal in nanomedicine, in particular, for systemic applications in oncological disorders. Now, the "holy grail" in nanomedicine is to design and synthesize new advanced macromolecular nanocarriers and to translate them from lab to clinic. This review describes the current and future perspectives of nanomedicine with particular emphasis on the clinical targets in cancer and inflammation. The advanced forms of liposomes and polyethylene glycol (PEG) based nanocarriers, as well as dendritic polymer conjugates will be discussed with particular attention paid to designs, synthetic strategies, and chemical pathways. In this critical review, we also report on the current status and perspective of dendritic polymer nanoconjugate platforms (e.g. polyamidoamine dendrimers and dendritic polyglycerols) for cellular localization and targeting of specific tissues (192 references).
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Affiliation(s)
- Jayant Khandare
- Piramal Life Sciences Ltd, 1 Nirlon Complex, Off Western Express Highway, Goregaon (E), Mumbai-400063, India
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Hu H, Armstrong PCJ, Khalil E, Chen YC, Straub A, Li M, Soosairajah J, Hagemeyer CE, Bassler N, Huang D, Ahrens I, Krippner G, Gardiner E, Peter K. GPVI and GPIbα mediate staphylococcal superantigen-like protein 5 (SSL5) induced platelet activation and direct toward glycans as potential inhibitors. PLoS One 2011; 6:e19190. [PMID: 21552524 PMCID: PMC3084272 DOI: 10.1371/journal.pone.0019190] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2010] [Accepted: 03/22/2011] [Indexed: 11/29/2022] Open
Abstract
Background Staphylococcus aureus (S. aureus) is a common pathogen capable of causing life-threatening infections. Staphylococcal superantigen-like protein 5 (SSL5) has recently been shown to bind to platelet glycoproteins and induce platelet activation. This study investigates further the interaction between SSL5 and platelet glycoproteins. Moreover, using a glycan discovery approach, we aim to identify potential glycans to therapeutically target this interaction and prevent SSL5-induced effects. Methodology/Principal Findings In addition to platelet activation experiments, flow cytometry, immunoprecipitation, surface plasmon resonance and a glycan binding array, were used to identify specific SSL5 binding regions and mediators. We independently confirm SSL5 to interact with platelets via GPIbα and identify the sulphated-tyrosine residues as an important region for SSL5 binding. We also identify the novel direct interaction between SSL5 and the platelet collagen receptor GPVI. Together, these receptors offer one mechanistic explanation for the unique functional influences SSL5 exerts on platelets. A role for specific families of platelet glycans in mediating SSL5-platelet interactions was also discovered and used to identify and demonstrate effectiveness of potential glycan based inhibitors in vitro. Conclusions/Significance These findings further elucidate the functional interactions between SSL5 and platelets, including the novel finding of a role for the GPVI receptor. We demonstrate efficacy of possible glycan-based approaches to inhibit the SSL5-induced platelet activation. Our data warrant further work to prove SSL5-platelet effects in vivo.
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Affiliation(s)
- Houyuan Hu
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
- Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | | | - Elie Khalil
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
| | - Yung-Chih Chen
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
- Department of Medicine, Monash University, Melbourne, Victoria, Australia
| | - Andreas Straub
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
| | - Min Li
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
- Department of Cardiology, Southwest Hospital, Third Military Medical University, Chongqing, China
| | | | | | - Nicole Bassler
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
| | - Dexing Huang
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
| | - Ingo Ahrens
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
| | - Guy Krippner
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
| | - Elizabeth Gardiner
- Australian Centre for Blood Diseases, Monash University, Melbourne, Victoria, Australia
| | - Karlheinz Peter
- Baker IDI Heart & Diabetes Institute, Melbourne, Victoria, Australia
- Department of Medicine, Monash University, Melbourne, Victoria, Australia
- * E-mail:
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Nicaise C, Coupier J, Dabadie M, De Decker R, Mangas A, Bodet D, Poncelet L, Geffard M, Pochet R. Gemals, a new drug candidate, extends lifespan and improves electromyographic parameters in a rat model of amyotrophic lateral sclerosis. ACTA ACUST UNITED AC 2009; 9:85-90. [DOI: 10.1080/17482960701788180] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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11
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Affiliation(s)
- Amit Joshi
- The Howard P Isermann Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, NY 12180, USA
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12
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Garnacho C, Dhami R, Simone E, Dziubla T, Leferovich J, Schuchman EH, Muzykantov V, Muro S. Delivery of acid sphingomyelinase in normal and niemann-pick disease mice using intercellular adhesion molecule-1-targeted polymer nanocarriers. J Pharmacol Exp Ther 2008; 325:400-8. [PMID: 18287213 DOI: 10.1124/jpet.107.133298] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Type B Niemann-Pick disease (NPD) is a multiorgan system disorder caused by a genetic deficiency of acid sphingomyelinase (ASM), for which lung is an important and challenging therapeutic target. In this study, we designed and evaluated new delivery vehicles for enzyme replacement therapy of type B NPD, consisting of polystyrene and poly(lactic-coglycolic) acid polymer nanocarriers targeted to intercellular adhesion molecule (ICAM)-1, an endothelial surface protein up-regulated in many pathologies, including type B NPD. Real-time vascular imaging using intravital microscopy and postmortem imaging of mouse organs showed rapid, uniform, and efficient binding of fluorescently labeled ICAM-1-targeted ASM nanocarriers (anti-ICAM/ASM nanocarriers) to endothelium after i.v. injection in mice. Fluorescence microscopy of lung alveoli actin, tissue histology, and 125I-albumin blood-to-lung transport showed that anti-ICAM nanocarriers cause neither detectable lung injury, nor abnormal vascular permeability in animals. Radioisotope tracing showed rapid disappearance from the circulation and enhanced accumulation of anti-ICAM/125I-ASM nanocarriers over the nontargeted naked enzyme in kidney, heart, liver, spleen, and primarily lung, both in wild-type and ASM knockout mice. These data demonstrate that ICAM-1-targeted nanocarriers may enhance enzyme replacement therapy for type B NPD and perhaps other lysosomal storage disorders.
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Affiliation(s)
- Carmen Garnacho
- Department of Pharmacology, John Morgan Bldg., 3620 Hamilton Walk, Philadelphia, PA 19104-6068, USA
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Sung BH, Kim SH, Yeo MG, Kim JK, Song WK. Human soluble E-selectin immunoadhesin inhibits leukemic monocyte adhesion to endothelial cells. Cell Biochem Funct 2007; 25:585-9. [PMID: 16892455 DOI: 10.1002/cbf.1361] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Immunoadhesins are immunoglobulin (Ig)-like chimeric proteins comprised of target-binding regions fused to the Fc-hinge region of Ig, and are designed to have a long half-life and antibody-like properties. In an effort to find a good candidate for therapeutic use for inflammatory responses, we constructed a soluble human E-selectin immunoadhesin containing the extracellular region of human E-selectin fused to the Fc-hinge region of human IgG, and determined its effects on leukocyte adhesion and rolling in vitro. Our results revealed that the adhesion of leukocytes to endothelial cells was efficiently inhibited in the presence of 50 nM E-selectin immunoadhesin. In addition, the E-selectin immunoadhesin significantly inhibited leukocyte rolling on endothelial cells in perfusion experiments performed at 1.0 dyne/cm(2) wall shear stress. These findings indicate that our E-selectin immunoadhesin decreases leukocyte attachment and rolling in vitro, suggesting that this immunoadhesin may be a promising candidate for therapeutic anti-inflammatory use.
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Affiliation(s)
- Bong Hwan Sung
- Department of Life Science, Gwangju Institute of Science and Technology, Gwangju, Republic of Korea
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Abstract
Information contained in the mammalian glycome is decoded by glycan-binding proteins (GBPs) that mediate diverse functions including host-pathogen interactions, cell trafficking and transmembrane signaling. Although information on the biological roles of GBPs is rapidly expanding, challenges remain in identifying the glycan ligands and their impact on GBP function. Protein-glycan interactions are typically low affinity, requiring multivalent interactions to achieve a biological effect. Though many glycoproteins can carry the glycan structure recognized by the GBP, other factors, such as recognition of protein epitopes and microdomain localization, may restrict which glycoproteins are functional ligands in situ. Recent advances in development of glycan arrays, synthesis of multivalent glycan ligands, bioengineering of cell-surface glycans and glycomics databases are providing new tools to identify the ligands of GBPs and to elucidate the mechanisms by which they participate in GBP function.
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Affiliation(s)
- James C Paulson
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, California 92037, USA.
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Muro S, Dziubla T, Qiu W, Leferovich J, Cui X, Berk E, Muzykantov VR. Endothelial targeting of high-affinity multivalent polymer nanocarriers directed to intercellular adhesion molecule 1. J Pharmacol Exp Ther 2006; 317:1161-9. [PMID: 16505161 DOI: 10.1124/jpet.105.098970] [Citation(s) in RCA: 153] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Targeting of diagnostic and therapeutic agents to endothelial cells (ECs) provides an avenue to improve treatment of many maladies. For example, intercellular adhesion molecule 1 (ICAM-1), a constitutive endothelial cell adhesion molecule up-regulated in many diseases, is a good determinant for endothelial targeting of therapeutic enzymes and polymer nanocarriers (PNCs) conjugated with anti-ICAM (anti-ICAM/PNCs). However, intrinsic and extrinsic factors that control targeting of anti-ICAM/PNCs to ECs (e.g., anti-ICAM affinity and PNC valency and flow) have not been defined. In this study we tested in vitro and in vivo parameters of targeting to ECs of anti-ICAM/PNCs consisting of either prototype polystyrene or biodegradable poly(lactic-coglycolic) acid polymers (approximately 200 nm diameter spheres carrying approximately 200 anti-ICAM molecules). Anti-ICAM/PNCs, but not control IgG/PNCs 1) rapidly (t1/2 approximately 5 min) and specifically bound to tumor necrosis factor-activated ECs in a dose-dependent manner (Bmax approximately 350 PNC/cell) at both static and physiological shear stress conditions and 2) bound to ECs and accumulated in the pulmonary vasculature after i.v. injection in mice. Anti-ICAM/PNCs displayed markedly higher EC affinity versus naked anti-ICAM (Kd approximately 80 pM versus approximately 8 nM) in cell culture and, probably because of this factor, higher value (185.3 +/- 24.2 versus 50.5 +/- 1.5% injected dose/g) and selectivity (lung/blood ratio 81.0 +/- 10.9 versus 2.1 +/- 0.02, in part due to faster blood clearance) of pulmonary targeting. These results 1) show that reformatting monomolecular anti-ICAM into high-affinity multivalent PNCs boosts their vascular immuno-targeting, which withstands physiological hydrodynamics and 2) support potential anti-ICAM/PNCs utility for medical applications.
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Affiliation(s)
- Silvia Muro
- Institute for Environmental Medicine, 1 John Morgan Building, 3620 Hamilton Walk, Philadelphia, PA 19104-6068, USA
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Hicks AER, Abbitt KB, Dodd P, Ridger VC, Hellewell PG, Norman KE. The anti-inflammatory effects of a selectin ligand mimetic, TBC-1269, are not a result of competitive inhibition of leukocyte rolling in vivo. J Leukoc Biol 2004; 77:59-66. [PMID: 15466915 DOI: 10.1189/jlb.1103573] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Selectins and their ligands support leukocyte rolling, facilitating the subsequent firm adhesion and migration that occur during inflammation. TBC-1269 (Bimosiamose), a structural mimetic of natural selectin ligands, inhibits P-, E-, and L-selectin in vitro, has anti-inflammatory effects in vivo, and recently underwent phase II clinical trials for childhood asthma and psoriasis. We studied whether the anti-inflammatory effects of TBC-1269 could be related to leukocyte rolling in vivo. Although TBC-1269 inhibited rolling of a murine leukocyte cell line on murine P-selectin in vitro and thioglycollate-induced peritonitis in vivo, it did not alter leukocyte rolling in mouse cremaster venules. TBC-1269 reduced neutrophil recruitment in thioglycollate-induced peritonitis in wild-type and P-selectin-/- mice but not in E-selectin-/- mice. We suggest that the in vivo effects of TBC-1269 may be mediated through E-selectin but do not appear to involve leukocyte rolling.
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Affiliation(s)
- Anne E R Hicks
- Cardiovascular Research Unit, University of Sheffield, United Kingdom
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