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Mencia G, Algar S, Lozano-Cruz T, Muñoz-Fernández MÁ, Gillies ER, Cano J, Valiente M, Gómez R. Carbosilane Dendritic Amphiphiles from Cholesterol or Vitamin E for Micelle Formation. Pharmaceutics 2024; 16:451. [PMID: 38675112 PMCID: PMC11053416 DOI: 10.3390/pharmaceutics16040451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 03/04/2024] [Accepted: 03/08/2024] [Indexed: 04/28/2024] Open
Abstract
Cationic dendritic amphiphiles were prepared through the linkage of interesting hydrophobic molecules such as cholesterol or vitamin E to the focal point of carbosilane dendrons. These new dendritic systems self-assembled in saline, producing micellar aggregates with hydrodynamic diameters ranging from 6.5 to 9.2 nm, and critical micelle concentrations of approximately 5 and 10 μM for second- and third-generation systems, respectively. The assemblies were able to encapsulate drugs of different charges (anionic, neutral, and cationic). Surprisingly, a 92% encapsulation efficiency for diclofenac was achieved in micelles prepared from second-generation dendrons. Toxicity measurements on peripheral blood mononuclear cells indicated different behavior depending on the generation, corresponding to the micellar regime. In contrast to the third-generation system, the second-generation system was non-toxic up to 20 μM, opening a window for its use in a micellar regimen, thereby operating as a drug delivery system for different biomedical applications.
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Affiliation(s)
- Gabriel Mencia
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. Del Río” (IQAR), University of Alcalá, 28805 Madrid, Spain; (G.M.); (S.A.); (T.L.-C.); (J.C.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain;
- Ramón y Cajal Health Research Institute (IRYCIS), 28034 Madrid, Spain
| | - Sergio Algar
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. Del Río” (IQAR), University of Alcalá, 28805 Madrid, Spain; (G.M.); (S.A.); (T.L.-C.); (J.C.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain;
| | - Tania Lozano-Cruz
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. Del Río” (IQAR), University of Alcalá, 28805 Madrid, Spain; (G.M.); (S.A.); (T.L.-C.); (J.C.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain;
- Ramón y Cajal Health Research Institute (IRYCIS), 28034 Madrid, Spain
| | - Mª Ángeles Muñoz-Fernández
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain;
- Laboratory Platform (Immunology), General Universitary Hospital Gregorio Marañón (HGUGM), 28007 Madrid, Spain
- Spanish HIV HGM BioBank, Health Research Institute Gregorio Marañón (HGUGM), 28007 Madrid, Spain
| | - Elizabeth R. Gillies
- Department of Chemistry and Chemical and Biochemical Engineering, School of Biomedical Engineering, University of Western Ontario, London, ON N6G1Z1, Canada;
| | - Jesús Cano
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. Del Río” (IQAR), University of Alcalá, 28805 Madrid, Spain; (G.M.); (S.A.); (T.L.-C.); (J.C.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain;
- Ramón y Cajal Health Research Institute (IRYCIS), 28034 Madrid, Spain
| | - Mercedes Valiente
- Department of Analytical Chemistry, Physical Chemistry and Chemical Engineering, Research Institute in Chemistry “Andrés M. Del Río” (IQAR), University of Alcalá, 28805 Madrid, Spain
| | - Rafael Gómez
- Department of Organic and Inorganic Chemistry, Research Institute in Chemistry “Andrés M. Del Río” (IQAR), University of Alcalá, 28805 Madrid, Spain; (G.M.); (S.A.); (T.L.-C.); (J.C.)
- Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), 28029 Madrid, Spain;
- Ramón y Cajal Health Research Institute (IRYCIS), 28034 Madrid, Spain
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2
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Zeng H, Liang X, Roberts DA, Gillies ER, Müllner M. Self-Assembly of Rod-Coil Bottlebrush Copolymers into Degradable Nanodiscs with a UV-Triggered Self-Immolation Process. Angew Chem Int Ed Engl 2024; 63:e202318881. [PMID: 38320963 DOI: 10.1002/anie.202318881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/31/2024] [Accepted: 02/05/2024] [Indexed: 02/08/2024]
Abstract
Polymer nanodiscs, especially with stimuli-responsive features, represent an unexplored frontier in the nanomaterial landscape. Such 2D nanomaterials are considered highly promising for advanced biomedicine applications. Herein, we designed a rod-coil copolymer architecture based on an amphiphilic, tadpole-like bottlebrush copolymer, which can directly self-assemble into core-shell nanodiscs in an aqueous environment. As the bottlebrush side chains are made of amorphous, UV-responsive poly(ethyl glyoxylate) (PEtG) chains, they can undergo rapid end-to-end self-immolation upon light irradiation. This triggered nanodisc disassembly can be used to boost small molecule release from the nanodisc core, which is further aided by a morphological change from discs to spheres.
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Affiliation(s)
- Haoxiang Zeng
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, 2006, Sydney, NSW, Australia
| | - Xiaoli Liang
- Department of Chemistry and Department of Chemical and Biochemical Engineering, The University of Western Ontario, N6A 5B7, London, Ontario, Canada
| | - Derrick A Roberts
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, 2006, Sydney, NSW, Australia
| | - Elizabeth R Gillies
- Department of Chemistry and Department of Chemical and Biochemical Engineering, The University of Western Ontario, N6A 5B7, London, Ontario, Canada
| | - Markus Müllner
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, 2006, Sydney, NSW, Australia
- The University of Sydney Nano Institute (Sydney Nano), The University of Sydney, 2006, Sydney, NSW, Australia
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3
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Blackler G, Lai-Zhao Y, Klapak J, Philpott HT, Pitchers KK, Maher AR, Fiset B, Walsh LA, Gillies ER, Appleton CT. Targeting STAT6-mediated synovial macrophage activation improves pain in experimental knee osteoarthritis. Arthritis Res Ther 2024; 26:73. [PMID: 38509602 PMCID: PMC10953260 DOI: 10.1186/s13075-024-03309-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 03/14/2024] [Indexed: 03/22/2024] Open
Abstract
BACKGROUND Pain from osteoarthritis (OA) is one of the top causes of disability worldwide, but effective treatment is lacking. Nociceptive factors are released by activated synovial macrophages in OA, but depletion of synovial macrophages paradoxically worsens inflammation and tissue damage in previous studies. Rather than depleting macrophages, we hypothesized that inhibiting macrophage activation may improve pain without increasing tissue damage. We aimed to identify key mechanisms mediating synovial macrophage activation and test the role of STAT signaling in macrophages on pain outcomes in experimental knee OA. METHODS We induced experimental knee OA in rats via knee destabilization surgery, and performed RNA sequencing analysis on sorted synovial tissue macrophages to identify macrophage activation mechanisms. Liposomes laden with STAT1 or STAT6 inhibitors, vehicle (control), or clodronate (depletion control) were delivered selectively to synovial macrophages via serial intra-articular injections up to 12 weeks after OA induction. Treatment effects on knee and hindpaw mechanical pain sensitivity were measured during OA development, along with synovitis, cartilage damage, and synovial macrophage infiltration using histopathology and immunofluorescence. Lastly, crosstalk between drug-treated synovial tissue and articular chondrocytes was assessed in co-culture. RESULTS The majority of pathways identified by transcriptomic analyses in OA synovial macrophages involve STAT signaling. As expected, macrophage depletion reduced pain, but increased synovial tissue fibrosis and vascularization. In contrast, STAT6 inhibition in macrophages led to marked, sustained improvements in mechanical pain sensitivity and synovial inflammation without worsening synovial or cartilage pathology. During co-culture, STAT6 inhibitor-treated synovial tissue had minimal effects on healthy chondrocyte gene expression, whereas STAT1 inhibitor-treated synovium induced changes in numerous cartilage turnover-related genes. CONCLUSION These results suggest that STAT signaling is a major mediator of synovial macrophage activation in experimental knee OA. STAT6 may be a key mechanism mediating the release of nociceptive factors from macrophages and the development of mechanical pain sensitivity. Whereas therapeutic depletion of macrophages paradoxically increases inflammation and fibrosis, blocking STAT6-mediated synovial macrophage activation may be a novel strategy for OA-pain management without accelerating tissue damage.
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Affiliation(s)
- Garth Blackler
- Department of Physiology and Pharmacology, Western University, London, ON, N6A 5B5, Canada
| | - Yue Lai-Zhao
- Department of Physiology and Pharmacology, Western University, London, ON, N6A 5B5, Canada
- Bone and Joint Institute, Western University, London, ON, N6A 5B5, Canada
| | - Joseph Klapak
- Department of Physiology and Pharmacology, Western University, London, ON, N6A 5B5, Canada
| | - Holly T Philpott
- Department of Physiology and Pharmacology, Western University, London, ON, N6A 5B5, Canada
- Bone and Joint Institute, Western University, London, ON, N6A 5B5, Canada
| | - Kyle K Pitchers
- Department of Physiology and Pharmacology, Western University, London, ON, N6A 5B5, Canada
| | - Andrew R Maher
- Department of Physiology and Pharmacology, Western University, London, ON, N6A 5B5, Canada
| | - Benoit Fiset
- Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, H3A 1A3, Canada
| | - Logan A Walsh
- Rosalind and Morris Goodman Cancer Research Centre, McGill University, Montreal, QC, H3A 1A3, Canada
- Department of Human Genetics, McGill University, Montreal, QC, H3A 0C7, Canada
| | - Elizabeth R Gillies
- Department of Chemistry, Western University, London, ON, N6A 5B5, Canada
- Department of Chemical and Biochemical Engineering, Western University, London, ON, N6A 5B5, Canada
| | - C Thomas Appleton
- Department of Physiology and Pharmacology, Western University, London, ON, N6A 5B5, Canada.
- Bone and Joint Institute, Western University, London, ON, N6A 5B5, Canada.
- Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, ON, N6A 5C1, Canada.
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4
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Deng Z, Liang X, Gillies ER. Click to Self-immolation: A "Click" Functionalization Strategy towards Triggerable Self-Immolative Homopolymers and Block Copolymers. Angew Chem Int Ed Engl 2024; 63:e202317063. [PMID: 38029347 DOI: 10.1002/anie.202317063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 12/01/2023]
Abstract
Self-immolative polymers (SIPs) are a class of degradable macromolecules that undergo stimuli-triggered head-to-tail depolymerization. However, a general approach to readily end-functionalize SIP precursors for programmed degradation remains elusive, restricting access to complex, functional SIP-based materials. Here we present a "click to self-immolation" strategy based on aroyl azide-capped SIP precursors, enabling the facile construction of diverse SIPs with different trigger units through a Curtius rearrangement and alcohol/thiol-isocyanate "click" reaction. This strategy is also applied to polymer-polymer coupling to access fully depolymerizable block copolymer amphiphiles, even combining different SIP backbones. Our results demonstrate that the depolymerization can be actuated efficiently under physiologically-relevant conditions by the removal of the trigger units and ensuing self-immolation of the p-aminobenzyl carbonate linkage, indicating promise for controlled release applications involving nanoparticles and hydrogels.
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Affiliation(s)
- Zhengyu Deng
- Department of Chemistry, The University of Western Ontario, London, Ontario, N6A 5B7, Canada
| | - Xiaoli Liang
- Department of Chemistry, The University of Western Ontario, London, Ontario, N6A 5B7, Canada
| | - Elizabeth R Gillies
- Department of Chemistry, The University of Western Ontario, London, Ontario, N6A 5B7, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, N6A 5B9, Canada
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5
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Smith S, Rossi Herling B, Zhang C, Beach MA, Teo SLY, Gillies ER, Johnston APR, Such GK. Self-Immolative Polymer Nanoparticles with Precise and Controllable pH-Dependent Degradation. Biomacromolecules 2023; 24:4958-4969. [PMID: 37709729 PMCID: PMC10649787 DOI: 10.1021/acs.biomac.3c00630] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Revised: 08/29/2023] [Indexed: 09/16/2023]
Abstract
Polymer nanoparticles have generated significant interest as delivery systems for therapeutic cargo. Self-immolative polymers (SIPs) are an interesting category of materials for delivery applications, as the characteristic property of end-to-end depolymerization allows for the disintegration of the delivery system, facilitating a more effective release of the cargo and clearance from the body after use. In this work, nanoparticles based on a pH-responsive polymer poly(ethylene glycol)-b-(2-diisopropyl)amino ethyl methacrylate) and a self-immolative polymer poly[N,N-(diisopropylamino)ethyl glyoxylamide-r-N,N-(dibutylamino)ethyl glyoxylamide] (P(DPAEGAm-r-DBAEGAm)) were developed. Four particles were synthesized based on P(DPAEGAm-r-DBAEGAm) polymers with varied diisopropylamino to dibutylamino ratios of 4:1, 2:1, 2:3, and 0:1, termed 4:1, 2:1, 2:3, and 0:1 PGAm particles. The pH of particle disassembly was tuned from pH 7.0 to pH 5.0 by adjusting the ratio of diisopropylamino to dibutylamino substituents on the pendant tertiary amine. The P(DPAEGAm-r-DBAEGAm) polymers were observed to depolymerize (60-80%) below the particle disassembly pH after ∼2 h, compared to <10% at pH 7.4 and maintained reasonable stability at pH 7.4 (20-50% depolymerization) after 1 week. While all particles exhibited the ability to load a peptide cargo, only the 4:1 PGAm particles had higher endosomal escape efficiency (∼4%) compared to the 2:3 or 0:1 PGAm particles (<1%). The 4:1 PGAm particle is a promising candidate for further optimization as an intracellular drug delivery system with rapid and precisely controlled degradation.
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Affiliation(s)
- Samuel
A. Smith
- Department
of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Bruna Rossi Herling
- Monash
Institute of Pharmaceutical Sciences, Monash
University, Parkville, Victoria 3010, Australia
| | - Changhe Zhang
- Department
of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Maximilian A. Beach
- Department
of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Serena L. Y. Teo
- Monash
Institute of Pharmaceutical Sciences, Monash
University, Parkville, Victoria 3010, Australia
| | - Elizabeth R. Gillies
- Department
of Chemistry and Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Angus P. R. Johnston
- Monash
Institute of Pharmaceutical Sciences, Monash
University, Parkville, Victoria 3010, Australia
| | - Georgina K. Such
- Department
of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
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6
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Grolman E, Sirianni QEA, Dunmore-Buyze J, Cruje C, Drangova M, Gillies ER. Depolymerizing self-immolative polymeric lanthanide chelates for vascular imaging. Acta Biomater 2023; 169:530-541. [PMID: 37507034 DOI: 10.1016/j.actbio.2023.07.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 07/03/2023] [Accepted: 07/22/2023] [Indexed: 07/30/2023]
Abstract
Medical imaging is widely used clinically and in research to understand disease progression and monitor responses to therapies. Vascular imaging enables the study of vascular disease and therapy, but exogenous contrast agents are generally needed to distinguish the vasculature from surrounding soft tissues. Lanthanide-based agents are commonly employed in MRI, but are also of growing interest for micro-CT, as the position of their k-edges allows them to provide enhanced contrast and also to be employed in dual-energy micro-CT, a technique that can distinguish contrast-enhanced blood vessels from tissues such as bone. Small molecule Gd3+ chelates are available, but are excreted too rapidly. At the same time, a lack of rapid clearance from the body for long-circulating agents presents toxicity concerns. To address these challenges, we describe here the use of self-immolative polymers for the development of new degradable chelates that depolymerize completely from end-to-end following the cleavage of a single end-cap from the polymer terminus. We demonstrate that tuning the end-cap allows the rate of depolymerization to be controlled, while tuning the polymer length enables the polymer to exhibit long circulation times in the blood of mice. After successfully providing one hour of blood contrast, depolymerization led to excretion of the resulting small molecule chelates into the bladder. Despite the high doses required for micro-CT, the agents were well tolerated in mice. Thus, these self-immolative polymeric chelates provide a new platform for the development of medical imaging contrast agents. STATEMENT OF SIGNIFICANCE: Vascular imaging is used clinically to diagnose and monitor vascular disease and in research to understand the progression of disease and study responses to new therapies. For techniques such as magnetic resonance imaging and x-ray computed tomography (CT), long circulating contrast agents are needed to differentiate the vasculature from surrounding tissues. However, if these agents are not rapidly excreted from the body, they can lead to toxicity. We present here a new polymeric system that can chelate hundreds of lanthanide ions for imaging contrast and can circulate for one hour in the blood, but then after end-cap cleavage breaks down completely into small molecules for excretion. The successful application of this system in micro-CT in mice is demonstrated.
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Affiliation(s)
- Eric Grolman
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada; Robarts Research Institute, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Quinton E A Sirianni
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Joy Dunmore-Buyze
- Robarts Research Institute, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Charmainne Cruje
- Department of Medical Biophysics, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5C1, Canada
| | - Maria Drangova
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada; Robarts Research Institute, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada; Department of Medical Biophysics, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5C1, Canada.
| | - Elizabeth R Gillies
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada; Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada; Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada.
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7
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Deng Z, Gillies ER. Emerging Trends in the Chemistry of End-to-End Depolymerization. JACS Au 2023; 3:2436-2450. [PMID: 37772181 PMCID: PMC10523501 DOI: 10.1021/jacsau.3c00345] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Revised: 08/09/2023] [Accepted: 08/16/2023] [Indexed: 09/30/2023]
Abstract
Over the past couple of decades, polymers that depolymerize end-to-end upon cleavage of their backbone or activation of a terminal functional group, sometimes referred to as "self-immolative" polymers, have been attracting increasing attention. They are of growing interest in the context of enhancing polymer degradability but also in polymer recycling as they allow monomers to be regenerated in a controlled manner under mild conditions. Furthermore, they are highly promising for applications as smart materials due to their ability to provide an amplified response to a specific signal, as a single sensing event is translated into the generation of many small molecules through a cascade of reactions. From a chemistry perspective, end-to-end depolymerization relies on the principles of self-immolative linkers and polymer ceiling temperature (Tc). In this article, we will introduce the key chemical concepts and foundations of the field and then provide our perspective on recent exciting developments. For example, over the past few years, new depolymerizable backbones, including polyacetals, polydisulfides, polyesters, polythioesters, and polyalkenamers, have been developed, while modern approaches to depolymerize conventional backbones such as polymethacrylates have also been introduced. Progress has also been made on the topological evolution of depolymerizable systems, including the introduction of fully depolymerizable block copolymers, hyperbranched polymers, and polymer networks. Furthermore, precision sequence-defined oligomers have been synthesized and studied for data storage and encryption. Finally, our perspectives on future opportunities and challenges in the field will be discussed.
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Affiliation(s)
- Zhengyu Deng
- Department
of Chemistry, The University of Western
Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
| | - Elizabeth R. Gillies
- Department
of Chemistry, The University of Western
Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B9, Canada
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8
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Gong J, Nhan J, St-Pierre JP, Gillies ER. Designing polymers for cartilage uptake: effects of architecture and molar mass. J Mater Chem B 2023; 11:8804-8816. [PMID: 37668597 DOI: 10.1039/d3tb01417g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/06/2023]
Abstract
Osteoarthritis (OA) is a progressive disease, involving the progressive breakdown of cartilage, as well as changes to the synovium and bone. There are currently no disease-modifying treatments available clinically. An increasing understanding of the disease pathophysiology is leading to new potential therapeutics, but improved approaches are needed to deliver these drugs, particularly to cartilage tissue, which is avascular and contains a dense matrix of collagens and negatively charged aggrecan proteoglycans. Cationic delivery vehicles have been shown to effectively penetrate cartilage, but these studies have thus far largely focused on proteins or nanoparticles, and the effects of macromolecular architectures have not yet been explored. Described here is the synthesis of a small library of polycations composed of N-(2-hydroxypropyl)methacrylamide (HPMA) and N-(3-aminopropyl)methacrylamide (APMA) with linear, 4-arm, or 8-arm structures and varying degrees of polymerization (DP) by reversible addition fragmentation chain-transfer (RAFT) polymerization. Uptake and retention of the polycations in bovine articular cartilage was assessed. While all polycations penetrated cartilage, uptake and retention generally increased with DP before decreasing for the highest DP. In addition, uptake and retention were higher for the linear polycations compared to the 4-arm and 8-arm polycations. In general, the polycations were well tolerated by bovine chondrocytes, but the highest DP polycations imparted greater cytotoxicity. Overall, this study reveals that linear polymer architectures may be more favorable for binding to the cartilage matrix and that the DP can be tuned to maximize uptake while minimizing cytotoxicity.
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Affiliation(s)
- Jue Gong
- Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.
| | - Jordan Nhan
- Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis-Pasteur Pvt., Ottawa, Ontario, K1N 6N5, Canada.
| | - Jean-Philippe St-Pierre
- Department of Chemical and Biological Engineering, University of Ottawa, 161 Louis-Pasteur Pvt., Ottawa, Ontario, K1N 6N5, Canada.
| | - Elizabeth R Gillies
- Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B7, Canada.
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, N6A 5B9, Canada
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9
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Kwan JC, Flannagan RS, Vásquez Peña M, Heinrichs DE, Holdsworth DW, Gillies ER. Induction Heating Triggers Antibiotic Release and Synergistic Bacterial Killing on Polymer-Coated Titanium Surfaces. Adv Healthc Mater 2023; 12:e2202807. [PMID: 37053473 DOI: 10.1002/adhm.202202807] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/30/2023] [Indexed: 04/15/2023]
Abstract
Infection is a major complication associated with orthopedic implants. It often involves the development of biofilms on metal substrates, which act as barriers to the host's immune system and systemic antibiotic treatment. The current standard of treatment is revision surgery, often involving the delivery of antibiotics through incorporation into bone cements. However, these materials exhibit sub-optimal antibiotic release kinetics and revision surgeries have drawbacks of high cost and recovery time. Herein, a new approach is presented using induction heating of a metal substrate, combined with an antibiotic-loaded poly(ester amide) coating undergoing a glass transition just above physiological temperature to enable thermally triggered antibiotic release. At normal physiological temperature, the coating provides a rifampicin depot for >100 days, while heating of the coating accelerates drug release, with >20% release over a 1-h induction heating cycle. Induction heating or antibiotic-loaded coating alone each reduce Staphylococcus aureus (S. aureus) viability and biofilm formation on Ti, but the combination causes synergistic killing of S. aureus as measured by crystal violet staining, determination of bacterial viability (>99.9% reduction), and fluorescence microscopy of bacteria on surfaces. Overall, these materials provide a promising platform enabling externally triggered antibiotic release to prevent and/or treat bacterial colonization of implants.
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Affiliation(s)
- Jan C Kwan
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B9, Canada
- Bone and Joint Institute, The University of Western Ontario, The Sandy Kirkley Centre for Musculoskeletal Research, University Hospital B6-200, London, Ontario, N6G 2V4, Canada
| | - Ronald S Flannagan
- Department of Microbiology and Immunology, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5C1, Canada
| | - Mónica Vásquez Peña
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B9, Canada
- Bone and Joint Institute, The University of Western Ontario, The Sandy Kirkley Centre for Musculoskeletal Research, University Hospital B6-200, London, Ontario, N6G 2V4, Canada
| | - David E Heinrichs
- Department of Microbiology and Immunology, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5C1, Canada
| | - David W Holdsworth
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B9, Canada
- Bone and Joint Institute, The University of Western Ontario, The Sandy Kirkley Centre for Musculoskeletal Research, University Hospital B6-200, London, Ontario, N6G 2V4, Canada
- Imaging Research Laboratories, Robarts Research Institute, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 2B8, Canada
- Department of Medical Biophysics, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5C1, Canada
| | - Elizabeth R Gillies
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B9, Canada
- Bone and Joint Institute, The University of Western Ontario, The Sandy Kirkley Centre for Musculoskeletal Research, University Hospital B6-200, London, Ontario, N6G 2V4, Canada
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B7, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario, N6A 5B9, Canada
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10
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Abstract
Hydrogels are of interest for a wide range of applications from sensors to drug delivery and tissue engineering. Self-immolative polymers, which depolymerize from end-to-end following a single backbone or end-cap cleavage, offer advantages such as amplification of the stimulus-mediated cleavage event through a cascade degradation process. It is also possible to change the active stimulus by changing only a single end-cap or linker unit. However, there are very few examples of self-immolative polymer hydrogels, and the reported examples exhibited relatively poor stability in their nontriggered state or slow degradation after triggering. Described here is the preparation of hydrogels composed of self-immolative poly(ethyl glyoxylate) (PEtG) and poly(ethylene glycol) (PEG). Hydrogels formed from 2 kg/mol 4-arm PEG and 1.2 kg/mol PEtG with a light-responsive linker end-cap had high gel content (90%), an equilibrium water content of 89%, and a compressive modulus of 26 kPa. The hydrogel degradation could be turned on and off repeatedly through alternating cycles of irradiation and dark storage. Similar cycles could also be used to control the release of the anti-inflammatory drug celecoxib. These results demonstrate the potential for self-immolative hydrogels to afford a high degree of control over responses to stimuli in the context of smart materials for a variety of applications.
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Affiliation(s)
- Jue Gong
- Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
| | - Aneta Borecki
- Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
| | - Elizabeth R Gillies
- Department of Chemistry, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B9, Canada
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11
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Li C, Deng Z, Gillies ER. Designing polymers with stimuli-responsive degradation for biomedical applications. Current Opinion in Biomedical Engineering 2022. [DOI: 10.1016/j.cobme.2022.100437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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12
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Abstract
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Self-immolative polymers
are a growing class of degradable polymers
that undergo end-to-end depolymerization after the stimuli-responsive
cleavage of an end-cap or backbone unit. Their incorporation into
amphiphilic block copolymers can lead to functions such as the disintegration
of copolymer nanoassemblies when depolymerization is triggered. However,
diblock copolymers have not yet been developed where both blocks are
self-immolative. Described here is the synthesis, self-assembly, and
triggered depolymerization of self-immolative block copolymers with
individually triggerable hydrophilic and hydrophobic blocks. Neutral
and cationic hydrophilic polyglyxoylamides (PGAm) with acid-responsive
end caps were synthesized and coupled to an ultraviolet (UV) light-triggerable
poly(ethyl glyoxylate) (PEtG) hydrophobic block. The resulting block
copolymers self-assembled to form nanoparticles in aqueous solution,
and their depolymerization in response to acid and UV light was studied
by techniques including light scattering, NMR spectroscopy, and electron
microscopy. Acid led to selective depolymerization of the PGAm blocks,
leading to aggregation, while UV light led to selective depolymerization
of the PEtG block, leading to disassembly. This self-immolative block
copolymer system provides an enhanced level of control over smart
copolymer assemblies and their degradation.
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Affiliation(s)
- Xiaoli Liang
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada, N6A 5B7
| | - Elizabeth R. Gillies
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada, N6A 5B7
- The Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario, Canada, N6A 5B7
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada, N6A 5B9
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13
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Abstract
Nucleic acids have immense potential for the treatment and prevention of a wide range of diseases, but delivery vehicles are needed to assist with their entry into cells. Polycations can...
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14
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Affiliation(s)
- Quinton E. A. Sirianni
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
- The Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Xiaoli Liang
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
- The Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Georgina K. Such
- The School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Elizabeth R. Gillies
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada N6A 5B7
- The Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, Ontario, Canada N6A 5B7
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada N6A 5B9
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15
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Abstract
Smart hydrogels are of great interest in areas such as drug delivery and sensing. Dendrimer-based hydrogels can exhibit tunable properties due to their structural precision. We prepared hydrogels from self-immolative dendrons. Controlled hydrogel degradation in response to light was demonstrated and the hydrogel properties as a function of dendron generation were compared.
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Affiliation(s)
- Karanpreet Gill
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, N6A 5B7, Canada.
| | - Xueli Mei
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, N6A 5B7, Canada.
| | - Elizabeth R Gillies
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, London, N6A 5B7, Canada. .,Department of Chemical and Biochemical Engineering and School of Biomedical Engineering, The University of Western Ontario, London, N6A 5B7, Canada
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16
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Abstract
Self-immolative polymers have significant potential for applications such as drug or gene delivery. However, to realize this potential, such materials need to be customized to respond to specific variations in biological conditions. In this work, we investigated the design of new star-shaped self-immolative poly(ethyl glyoxylate)s (PEtGs) and their incorporation into responsive nanoparticles. PEtGs are a subclass of stimulus-responsive self-immolative polymers, which can be combined with different stimuli-responsive functionalities. Two different tetrathiol initiators were used for the polymerization in combination with a variety of potential pH-responsive end-caps, yielding a library of star PEtG polymers which were responsive to pH. Characterization of the depolymerization behavior of the polymers showed that the depolymerization rate was controlled by the end caps rather than the architecture of the polymer. A selection of the star polymers were modified with amines to allow introduction of charge-shifting properties. It was shown that pH-responsive nanoparticles could be prepared from these modified polymers and they demonstrated pH-dependent particle disruption. The pH responsiveness of these particles was studied by dynamic light scattering and 1H nuclear magnetic resonance spectroscopy.
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Affiliation(s)
- Changhe Zhang
- The School of Chemistry, The University of Melbourne, Parkville 3010 Victoria, Australia
| | - Sarah Kermaniyan
- The School of Chemistry, The University of Melbourne, Parkville 3010 Victoria, Australia
| | - Samuel A Smith
- The School of Chemistry, The University of Melbourne, Parkville 3010 Victoria, Australia
| | - Elizabeth R Gillies
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research and Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Georgina K Such
- The School of Chemistry, The University of Melbourne, Parkville 3010 Victoria, Australia
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17
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Zhu Y, Marin LM, Xiao Y, Gillies ER, Siqueira WL. pH-Sensitive Chitosan Nanoparticles for Salivary Protein Delivery. Nanomaterials (Basel) 2021; 11:nano11041028. [PMID: 33920657 PMCID: PMC8073935 DOI: 10.3390/nano11041028] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/09/2021] [Accepted: 04/14/2021] [Indexed: 12/01/2022]
Abstract
Salivary proteins such as histatins (HTNs) have demonstrated critical biological functions directly related to tooth homeostasis and prevention of dental caries. However, HTNs are susceptible to the high proteolytic activities in the oral environment. Therefore, pH-sensitive chitosan nanoparticles (CNs) have been proposed as potential carriers to protect proteins from enzymatic degradation at physiological salivary pH. Four different types of chitosan polymers were investigated and the optimal formulation had good batch to batch reproducibility, with an average hydrodynamic diameter of 144 ± 6 nm, a polydispersity index of 0.15 ± 0.04, and a zeta potential of 18 ± 4 mV at a final pH of 6.3. HTN3 encapsulation and release profiles were characterized by cationic polyacrylamide gel electrophoresis. The CNs successfully encapsulated HTN3 and selectively swelled at acidic pH to facilitate HTN3 release. Protection of HTN3 against enzymatic degradation was investigated in diluted whole saliva. HTN3 encapsulated in the CNs had a prolonged survival time compared to the free HTN3. CNs with and without HTN3 also successfully reduced biofilm weight and bacterial viability. The results of this study have demonstrated the suitability of CNs as potential protein carriers for oral applications, especially for complications occurring at acidic conditions.
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Affiliation(s)
- Yi Zhu
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada; (Y.Z.); (E.R.G.)
| | - Lina M. Marin
- College of Dentistry, University of Saskatchewan, 105 Wiggins Rd, Saskatoon, SK S7N 5E4, Canada;
| | - Yizhi Xiao
- Schulich Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5C1, Canada;
| | - Elizabeth R. Gillies
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 3K7, Canada; (Y.Z.); (E.R.G.)
- Department of Chemistry, Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - Walter L. Siqueira
- College of Dentistry, University of Saskatchewan, 105 Wiggins Rd, Saskatoon, SK S7N 5E4, Canada;
- Correspondence:
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18
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Prince DA, Villamagna IJ, Borecki A, Beier F, de Bruyn JR, Hurtig M, Gillies ER. Correction to “Thermoresponsive and Covalently Cross-Linkable Hydrogels for Intra-Articular Drug Delivery”. ACS Appl Bio Mater 2021; 4:2850. [DOI: 10.1021/acsabm.1c00152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Mei X, Villamagna IJ, Nguyen T, Beier F, Appleton CT, Gillies ER. Polymer particles for the intra-articular delivery of drugs to treat osteoarthritis. Biomed Mater 2021; 16. [PMID: 33711838 DOI: 10.1088/1748-605x/abee62] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Accepted: 03/12/2021] [Indexed: 01/15/2023]
Abstract
Osteoarthritis (OA) is a leading cause of chronic disability. It is a progressive disease, involving pathological changes to the entire joint, resulting in joint pain, stiffness, swelling, and loss of mobility. There is currently no disease-modifying pharmaceutical treatment for OA, and the treatments that do exist suffer from significant side effects. An increasing understanding of the molecular pathways involved in OA is leading to many potential drug targets. However, both current and new therapies can benefit from a targeted approach that delivers drugs selectively to joints at therapeutic concentrations, while limiting systemic exposure to the drugs. Delivery systems including hydrogels, liposomes, and various types of particles have been explored for intra-articular drug delivery. This review will describe progress over the past several years in the development of polymer-based particles for OA treatment, as well as their in vitro, in vivo, and clinical evaluation. Systems based on biopolymers such as polysaccharides and polypeptides, as well as synthetic polyesters, poly(ester amide)s, thermoresponsive polymers, poly(vinyl alcohol), amphiphilic polymers, and dendrimers will be described. We will discuss the role of particle size, biodegradability, and mechanical properties in the behavior of the particles in the joint, and the challenges to be addressed in future research.
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Affiliation(s)
- Xueli Mei
- Department of Chemistry, Western University, 1151 Richmond St., London, Ontario, N6A 5B7, CANADA
| | - Ian J Villamagna
- School of Biomedical Engineering, Western University, 1151 Richmond St., London, Ontario, N6A 5B9, CANADA
| | - Tony Nguyen
- Department of Chemistry, Western University, 1151 Richmond St., London, Ontario, N6A 5B7, CANADA
| | - Frank Beier
- Department of Physiology and Pharmacology, Western University, 1151 Richmond St., London, Ontario, N6A 3B7, CANADA
| | - C Thomas Appleton
- Department of Physiology and Pharmacology, Department of Medicine, Western University, 1151 Richmond St., London, Ontario, N6A 3B7, CANADA
| | - Elizabeth R Gillies
- Department of Chemistry and Department of Chemical and Biochemical Engineering, Western University, 1151 Richmond St., London, Ontario, N6A 5B7, CANADA
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20
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Maschmeyer PG, Liang X, Hung A, Ahmadzai O, Kenny AL, Luong YC, Forder TN, Zeng H, Gillies ER, Roberts DA. Post-polymerization ‘click’ end-capping of polyglyoxylate self-immolative polymers. Polym Chem 2021. [DOI: 10.1039/d1py01169c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Post-polymerization CuAAC reactions are used to ‘click’ stimuli-cleavable triazole end-caps onto self-immolative poly(ethyl glyoxylate).
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Affiliation(s)
- Peter G. Maschmeyer
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Xiaoli Liang
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research. The University of Western Ontario, 1151 Richmond St., London, Canada N6A 5B7
| | - Allison Hung
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research. The University of Western Ontario, 1151 Richmond St., London, Canada N6A 5B7
| | - Oksana Ahmadzai
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Annmaree L. Kenny
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Yuan C. Luong
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Timothy N. Forder
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Haoxiang Zeng
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
| | - Elizabeth R. Gillies
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research. The University of Western Ontario, 1151 Richmond St., London, Canada N6A 5B7
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B9
| | - Derrick A. Roberts
- Key Centre for Polymers and Colloids, School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
- Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
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21
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Yardley RE, Rabiee Kenaree A, Liang X, Gillies ER. Transesterification of Poly(ethyl glyoxylate): A Route to Structurally Diverse Polyglyoxylates. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01197] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rebecca E. Yardley
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
| | - Amir Rabiee Kenaree
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
| | - Xiaoli Liang
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
| | - Elizabeth R. Gillies
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B7, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario N6A 5B9, Canada
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22
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Affiliation(s)
- Amir Rabiee Kenaree
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151, Richmond Street, London N6A 5B7, Ontario, Canada
| | - Quinton E. A. Sirianni
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151, Richmond Street, London N6A 5B7, Ontario, Canada
| | - Kyle Classen
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151, Richmond Street, London N6A 5B7, Ontario, Canada
| | - Elizabeth R. Gillies
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151, Richmond Street, London N6A 5B7, Ontario, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London N6A 5B9, Ontario, Canada
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23
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Harrison TD, Salmon AJ, de Bruyn JR, Ragogna PJ, Gillies ER. Phosphonium versus Ammonium Compact Polyelectrolyte Complex Networks with Alginate-Comparing Their Properties and Cargo Encapsulation. Langmuir 2020; 36:8253-8264. [PMID: 32568551 DOI: 10.1021/acs.langmuir.0c01370] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Phosphonium and ammonium polymers can be combined with polyanions to form polyelectrolyte complex (PEC) networks, with potential application in self-healing materials and drug delivery vehicles. While various structures and compositions have been explored, to the best of our knowledge, analogous ammonium and phosphonium networks have not been directly compared to evaluate the effects of phosphorus versus nitrogen cations on the network properties. In this study, we prepared PECs from sodium alginate and poly[triethyl(4-vinylbenzyl)phosphonium chloride], poly[triethyl(4-vinylbenzyl)ammonium chloride], poly[tri(n-butyl)(4-vinylbenzyl)phosphonium chloride], poly[tri(n-butyl)(4-vinylbenzyl)ammonium chloride], and poly[tris(hydroxypropyl)(4-vinylbenzyl)phosphonium chloride]. These networks were ultracentrifuged to form compact PECs (CoPECs), and their physical properties, chemical composition, and self-healing abilities were studied. In phosphate-buffered saline, the phosphonium polymer networks swelled to a higher degree than their ammonium salt-containing counterparts. However, the viscous and elastic moduli, along with their relaxation times, were quite similar for analogous phosphoniums and ammoniums. The CoPEC networks were loaded with anions including fluorescein, etodolac, and methotrexate, resulting in loading capacities ranging from 5 to 14 w/w % and encapsulation efficiencies from 29 to 93%. Anion release occurred over a period of several days to weeks, with the rate depending largely on the anion structure and polycation substituent groups. Whether the cation was an ammonium or a phosphonium had a smaller effect on the release rates. The cytotoxicities of the networks and polycations were investigated and found to depend on both the network and polycation structure.
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Affiliation(s)
- Tristan D Harrison
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - Alexandre J Salmon
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - John R de Bruyn
- Department of Physics and Astronomy and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - Paul J Ragogna
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - Elizabeth R Gillies
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
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24
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Villamagna IJ, McRae DM, Borecki A, Mei X, Lagugné-Labarthet F, Beier F, Gillies ER. GSK3787-Loaded Poly(Ester Amide) Particles for Intra-Articular Drug Delivery. Polymers (Basel) 2020; 12:E736. [PMID: 32224867 PMCID: PMC7240550 DOI: 10.3390/polym12040736] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/16/2020] [Accepted: 03/16/2020] [Indexed: 01/04/2023] Open
Abstract
Osteoarthritis (OA) is a debilitating joint disorder affecting more than 240 million people. There is no disease modifying therapeutic, and drugs that are used to alleviate OA symptoms result in side effects. Recent research indicates that inhibition of peroxisome proliferator-activated receptor δ (PPARδ) in cartilage may attenuate the development or progression of OA. PPARδ antagonists such as GSK3787 exist, but would benefit from delivery to joints to avoid side effects. Described here is the loading of GSK3787 into poly(ester amide) (PEA) particles. The particles contained 8 wt.% drug and had mean diameters of about 600 nm. Differential scanning calorimetry indicated the drug was in crystalline domains in the particles. Atomic force microscopy was used to measure the Young's moduli of individual particles as 2.8 MPa. In vitro drug release studies showed 11% GSK3787 was released over 30 days. Studies in immature murine articular cartilage (IMAC) cells indicated low toxicity from the drug, empty particles, and drug-loaded particles and that the particles were not taken up by the cells. Ex vivo studies on murine joints showed that the particles could be injected into the joint space and resided there for at least 7 days. Overall, these results indicate that GSK3787-loaded PEA particles warrant further investigation as a delivery system for potential OA therapy.
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Affiliation(s)
- Ian J. Villamagna
- School of Biomedical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada;
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
| | - Danielle M. McRae
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Aneta Borecki
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Xueli Mei
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - François Lagugné-Labarthet
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
| | - Frank Beier
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Physiology and Pharmacology, The University of Western Ontario, London, ON N6A 3B7, Canada
| | - Elizabeth R. Gillies
- School of Biomedical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada;
- Bone and Joint Institute, The University of Western Ontario, London, ON N6A 5B9, Canada; (F.L.-L.); (F.B.)
- Department of Chemistry, The University of Western Ontario, London, ON N6A 5B7, Canada; (D.M.M.); (A.B.); (X.M.)
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada
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25
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Affiliation(s)
- Elizabeth R. Gillies
- Department of Chemistry, Department of Chemical and Biochemical Engineering, Centre for Advanced Materials and Biomaterials Research, TheUniversity of Western Ontario London, ON Canada N6A 5B7
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26
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Shridhar A, Amsden BG, Gillies ER, Flynn LE. Investigating the Effects of Tissue-Specific Extracellular Matrix on the Adipogenic and Osteogenic Differentiation of Human Adipose-Derived Stromal Cells Within Composite Hydrogel Scaffolds. Front Bioeng Biotechnol 2019; 7:402. [PMID: 31921807 PMCID: PMC6917659 DOI: 10.3389/fbioe.2019.00402] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Accepted: 11/22/2019] [Indexed: 12/21/2022] Open
Abstract
While it has been postulated that tissue-specific bioscaffolds derived from the extracellular matrix (ECM) can direct stem cell differentiation, systematic comparisons of multiple ECM sources are needed to more fully assess the benefits of incorporating tissue-specific ECM in stem cell culture and delivery platforms. To probe the effects of ECM sourced from decellularized adipose tissue (DAT) or decellularized trabecular bone (DTB) on the adipogenic and osteogenic differentiation of human adipose-derived stem/stromal cells (ASCs), a novel detergent-free decellularization protocol was developed for bovine trabecular bone that complemented our established detergent-free decellularization protocol for human adipose tissue and did not require specialized equipment or prolonged incubation times. Immunohistochemical and biochemical characterization revealed enhanced sulphated glycosaminoglycan content in the DTB, while the DAT contained higher levels of collagen IV, collagen VI and laminin. To generate platforms with similar structural and biomechanical properties to enable assessment of the compositional effects of the ECM on ASC differentiation, micronized DAT and DTB were encapsulated with human ASCs within methacrylated chondroitin sulfate (MCS) hydrogels through UV-initiated crosslinking. High ASC viability (>90%) was observed over 14 days in culture. Adipogenic differentiation was enhanced in the MCS+DAT composites relative to the MCS+DTB composites and MCS controls after 14 days of culture in adipogenic medium. Osteogenic differentiation studies revealed a peak in alkaline phosphatase (ALP) enzyme activity at 7 days in the MCS+DTB group cultured in osteogenic medium, suggesting that the DTB had bioactive effects on osteogenic protein expression. Overall, the current study suggests that tissue-specific ECM sourced from DAT or DTB can act synergistically with soluble differentiation factors to enhance the lineage-specific differentiation of human ASCs within 3-D hydrogel systems.
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Affiliation(s)
- Arthi Shridhar
- Department of Chemical and Biochemical Engineering, Thompson Engineering Building, The University of Western Ontario, London, ON, Canada
- Bone and Joint Institute, The University of Western Ontario, London, ON, Canada
| | - Brian G. Amsden
- Department of Chemical Engineering, Queen's University, Kingston, ON, Canada
| | - Elizabeth R. Gillies
- Department of Chemical and Biochemical Engineering, Thompson Engineering Building, The University of Western Ontario, London, ON, Canada
- Bone and Joint Institute, The University of Western Ontario, London, ON, Canada
- Department of Chemistry, The University of Western Ontario, London, ON, Canada
| | - Lauren E. Flynn
- Department of Chemical and Biochemical Engineering, Thompson Engineering Building, The University of Western Ontario, London, ON, Canada
- Bone and Joint Institute, The University of Western Ontario, London, ON, Canada
- Department of Anatomy and Cell Biology, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON, Canada
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Shridhar A, Lam AYL, Sun Y, Simmons CA, Gillies ER, Flynn LE. Culture on Tissue‐Specific Coatings Derived from α‐Amylase‐Digested Decellularized Adipose Tissue Enhances the Proliferation and Adipogenic Differentiation of Human Adipose‐Derived Stromal Cells. Biotechnol J 2019; 15:e1900118. [DOI: 10.1002/biot.201900118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 10/08/2019] [Indexed: 12/12/2022]
Affiliation(s)
- Arthi Shridhar
- Department of Chemical and Biochemical EngineeringThompson Engineering BuildingThe University of Western Ontario London N6A 5B9 Ontario Canada
| | - Alan Y. L. Lam
- Institute of Biomaterials and Biomedical EngineeringUniversity of Toronto Toronto M5S 3G9 Ontario Canada
| | - Yu Sun
- Institute of Biomaterials and Biomedical EngineeringUniversity of Toronto Toronto M5S 3G9 Ontario Canada
- Department of Mechanical and Industrial EngineeringUniversity of Toronto Toronto M5S 3G8 Ontario Canada
| | - Craig A. Simmons
- Institute of Biomaterials and Biomedical EngineeringUniversity of Toronto Toronto M5S 3G9 Ontario Canada
- Department of Mechanical and Industrial EngineeringUniversity of Toronto Toronto M5S 3G8 Ontario Canada
| | - Elizabeth R. Gillies
- Department of Chemical and Biochemical EngineeringThompson Engineering BuildingThe University of Western Ontario London N6A 5B9 Ontario Canada
- Department of ChemistryThe University of Western Ontario London N6A 5B7 Ontario Canada
| | - Lauren E. Flynn
- Department of Chemical and Biochemical EngineeringThompson Engineering BuildingThe University of Western Ontario London N6A 5B9 Ontario Canada
- Department of Anatomy & Cell BiologySchulich School of Medicine & DentistryThe University of Western Ontario London N6A 3K7 Ontario Canada
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Heuchan SM, Fan B, Kowalski JJ, Gillies ER, Henry HAL. Development of Fertilizer Coatings from Polyglyoxylate-Polyester Blends Responsive to Root-Driven pH Change. J Agric Food Chem 2019; 67:12720-12729. [PMID: 31652059 DOI: 10.1021/acs.jafc.9b04717] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Many current controlled-release fertilizers (CRFs) are coated with nonbiodegradable polymers that can contribute to microplastic pollution. Here, coatings of self-immolative poly(ethyl glyoxylate) (PEtG) capped with a carbamate and blended with polycaprolactone (PCL) or poly(l-lactic acid) (PLA) were evaluated. They were designed to depolymerize and release fertilizers in the vicinity of plant roots, where the pH is lower than that in the surrounding environment. PEtG/PCL coatings exhibited significant temperature and pH effects, requiring 18 days at pH 5 and 30 °C, compared to 77 days at pH 7 and 22 °C, to reach 15% mass loss. Plant roots were also effective in triggering coating degradation. Spray-coating and melt-coating were explored, with the latter being more effective in providing pellets that retained urea prior to polymer degradation. Finally, PEtG/PCL-coated pellets promoted plant growth to a similar degree or better than currently available CRFs.
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Harrison TD, Yunyaeva O, Borecki A, Hopkins CC, de Bruyn JR, Ragogna PJ, Gillies ER. Phosphonium Polyelectrolyte Complexes for the Encapsulation and Slow Release of Ionic Cargo. Biomacromolecules 2019; 21:152-162. [PMID: 31502452 DOI: 10.1021/acs.biomac.9b01115] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Polyelectrolyte complexation, the combination of anionically and cationically charged polymers through ionic interactions, can be used to form hydrogel networks. These networks can be used to encapsulate and release cargo, but the release of cargo is typically rapid, occurring over a period of hours to a few days and they often exhibit weak, fluid-like mechanical properties. Here we report the preparation and study of polyelectrolyte complexes (PECs) from sodium hyaluronate (HA) and poly[tris(hydroxypropyl)(4-vinylbenzyl)phosphonium chloride], poly[triphenyl(4-vinylbenzyl)phosphonium chloride], poly[tri(n-butyl)(4-vinylbenzyl)phosphonium chloride], or poly[triethyl(4-vinylbenzyl)phosphonium chloride]. The networks were compacted by ultracentrifugation, then their composition, swelling, rheological, and self-healing properties were studied. Their properties depended on the structure of the phosphonium polymer and the salt concentration, but in general, they exhibited predominantly gel-like behavior with relaxation times greater than 40 s and self-healing over 2-18 h. Anionic molecules, including fluorescein, diclofenac, and adenosine-5'-triphosphate, were encapsulated into the PECs with high loading capacities of up to 16 wt %. Fluorescein and diclofenac were slowly released over 60 days, which was attributed to a combination of hydrophobic and ionic interactions with the dense PEC network. The cytotoxicities of the polymers and their corresponding networks with HA to C2C12 mouse myoblast cells was investigated and found to depend on the structure of the polymer and the properties of the network. Overall, this work demonstrates the utility of polyphosphonium-HA networks for the loading and slow release of ionic drugs and that their physical and biological properties can be readily tuned according to the structure of the phosphonium polymer.
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Affiliation(s)
- Tristan D Harrison
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 5B7
| | - Olga Yunyaeva
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 5B7
| | - Aneta Borecki
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 5B7
| | - Cameron C Hopkins
- Department of Physics and Astronomy and the Centre for Advanced Materials and Biomaterials Research , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 3K7
| | - John R de Bruyn
- Department of Physics and Astronomy and the Centre for Advanced Materials and Biomaterials Research , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 3K7
| | - Paul J Ragogna
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 5B7
| | - Elizabeth R Gillies
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 5B7.,Department of Chemical and Biochemical Engineering , The University of Western Ontario , 1151 Richmond Street , London , Ontario , Canada N6A 5B9
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Prince DA, Villamagna IJ, Borecki A, Beier F, de Bruyn JR, Hurtig M, Gillies ER. Thermoresponsive and Covalently Cross-Linkable Hydrogels for Intra-Articular Drug Delivery. ACS Appl Bio Mater 2019; 2:3498-3507. [DOI: 10.1021/acsabm.9b00410] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- David Andrew Prince
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Ian J. Villamagna
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
- Bone and Joint Institute, The University of Western Ontario, London, Ontario N6A 3K7, Canada
| | - Aneta Borecki
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
- Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - Frank Beier
- Bone and Joint Institute, The University of Western Ontario, London, Ontario N6A 3K7, Canada
- Department of Physiology and Pharmacology, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3B7, Canada
| | - John R. de Bruyn
- Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
- Department of Physics and Astronomy, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
| | - Mark Hurtig
- Ontario Veterinary College, Department of Clinical Studies, University of Guelph, 50 Stone Road, Guelph, Ontario N1G 2W1, Canada
| | - Elizabeth R. Gillies
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
- School of Biomedical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
- Bone and Joint Institute, The University of Western Ontario, London, Ontario N6A 3K7, Canada
- Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3K7, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
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Prince DA, Villamagna IJ, Hopkins CC, de Bruyn JR, Gillies ER. Effect of drug loading on the properties of temperature‐responsive polyester–poly(ethylene glycol)–polyester hydrogels. POLYM INT 2019. [DOI: 10.1002/pi.5797] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- David Andrew Prince
- Department of Chemistry and Centre for Advanced Materials and Biomaterials ResearchUniversity of Western Ontario London ON Canada
| | - Ian J Villamagna
- School of Biomedical EngineeringUniversity of Western Ontario London ON Canada
| | - Cameron C Hopkins
- Department of Physics and Astronomy and Centre for Advanced Materials and Biomaterials ResearchUniversity of Western Ontario London ON Canada
| | - John R de Bruyn
- Department of Physics and Astronomy and Centre for Advanced Materials and Biomaterials ResearchUniversity of Western Ontario London ON Canada
| | - Elizabeth R Gillies
- Department of Chemistry and Centre for Advanced Materials and Biomaterials ResearchUniversity of Western Ontario London ON Canada
- Department of Chemical and Biochemical EngineeringUniversity of Western Ontario London ON Canada
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Villamagna IJ, Gordon TN, Hurtig MB, Beier F, Gillies ER. Poly(ester amide) particles for controlled delivery of celecoxib. J Biomed Mater Res A 2019; 107:1235-1243. [PMID: 30698325 DOI: 10.1002/jbm.a.36632] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 11/12/2018] [Accepted: 12/06/2018] [Indexed: 12/31/2022]
Abstract
Many potential pharmacological treatments for osteoarthritis can result in undesirable side effects due to the systemic administration of drugs, making the direct delivery of drugs to joints an attractive alternative. Poly(ester amide)s (PEAs) have been shown to exhibit promising properties for the development of particle-based intra-articular delivery vehicles. However, a limited range of PEA structures has been investigated. In this study, we prepared and characterized the properties of two different PEA particles composed of l-phenylalanine, sebacic acid, and either 1,4-butanediol or 1,8-octanediol (PBSe and POSe, respectively). The anti-inflammatory drug celecoxib (CXB) was encapsulated into the particles. Despite minor structural differences, PBSe and POSe exhibited different thermal and mechanical properties, and encapsulation of CXB influenced these properties. PBSe-CXB particles provided a slower release of drug in vitro relative to POSe-CXB. Toxicity studies showed that particles without drug exhibited low toxicity to ATDC5 and C2C12 cells, while the PBSe-CXB particles exhibited concentration-dependent toxicity. Host response to the particles was evaluated in an ovine model. No adverse effects were observed following intra-articular injection and it was observed that the particles diffused into the surrounding tissues. This work shows the importance of structural tuning in PEA delivery vehicles and demonstrates their potential for further development. © 2019 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 107A: 1235-1243, 2019.
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Affiliation(s)
- Ian J Villamagna
- School of Biomedical Engineering, The University of Western Ontario, London, Ontario N6A 5B9, Canada.,Bone and Joint Institute, The University of Western Ontario, London, Ontario N6A 5B9, Canada
| | - Trent N Gordon
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario N6A 5B9, Canada
| | - Mark B Hurtig
- Department of Clinical Studies, Ontario Veterinary College, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Frank Beier
- Bone and Joint Institute, The University of Western Ontario, London, Ontario N6A 5B9, Canada.,Department of Physiology and Pharmacology, The University of Western Ontario, London, Ontario N6A 3B7, Canada
| | - Elizabeth R Gillies
- Bone and Joint Institute, The University of Western Ontario, London, Ontario N6A 5B9, Canada.,Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario N6A 5B9, Canada.,Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
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Palermo EF, Lienkamp K, Gillies ER, Ragogna PJ. Antibacterial Activity of Polymers: Discussions on the Nature of Amphiphilic Balance. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813810] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Edmund F. Palermo
- Rensselaer Polytechnic InstituteMaterials Science and Engineering 110 8th St. Troy NY 12180 USA
| | - Karen Lienkamp
- Freiburg Center for Interactive Materials and Bioinspired Technologies (FIT) and Department of Microsystems Engineering (IMTEK)Albert-Ludwigs-Universität Georges-Köhler-Allee 105 79110 Freiburg Germany
| | - Elizabeth R. Gillies
- Centre for Advanced Materials and Biomaterials ResearchDepartment of ChemistryThe University of Western Ontario 1151 Richmond St. London Canada
- Department of Chemical and Biochemical EngineeringThe University of Western Ontario 1151 Richmond St. London Canada
| | - Paul J. Ragogna
- Centre for Advanced Materials and Biomaterials ResearchDepartment of ChemistryThe University of Western Ontario 1151 Richmond St. London Canada
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35
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Palermo EF, Lienkamp K, Gillies ER, Ragogna PJ. Antibacterial Activity of Polymers: Discussions on the Nature of Amphiphilic Balance. Angew Chem Int Ed Engl 2019; 58:3690-3693. [DOI: 10.1002/anie.201813810] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Indexed: 01/10/2023]
Affiliation(s)
- Edmund F. Palermo
- Rensselaer Polytechnic Institute Materials Science and Engineering 110 8th St. Troy NY 12180 USA
| | - Karen Lienkamp
- Freiburg Center for Interactive Materials and Bioinspired Technologies (FIT) and Department of Microsystems Engineering (IMTEK) Albert-Ludwigs-Universität Georges-Köhler-Allee 105 79110 Freiburg Germany
| | - Elizabeth R. Gillies
- Centre for Advanced Materials and Biomaterials Research Department of Chemistry The University of Western Ontario 1151 Richmond St. London Canada
- Department of Chemical and Biochemical Engineering The University of Western Ontario 1151 Richmond St. London Canada
| | - Paul J. Ragogna
- Centre for Advanced Materials and Biomaterials Research Department of Chemistry The University of Western Ontario 1151 Richmond St. London Canada
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Heuchan SM, MacDonald JP, Bauman LA, Fan B, Henry HAL, Gillies ER. Photoinduced Degradation of Polymer Films Using Polyglyoxylate-Polyester Blends and Copolymers. ACS Omega 2018; 3:18603-18612. [PMID: 31458428 PMCID: PMC6643861 DOI: 10.1021/acsomega.8b02826] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 12/07/2018] [Indexed: 06/10/2023]
Abstract
Polymeric coatings are commonly employed to alter surface properties. While some coatings are designed to remain stable over a prolonged period, in applications such as pharmaceuticals or fertilizers, the coating is designed to erode and reveal or release the underlying material. Self-immolative polymers (SIPs) undergo depolymerization following the cleavage of stimuli-responsive end-caps from their termini, enabling controlled depolymerization in the solid state and in solution. Poly(ethyl glyoxylate) (PEtG) is a promising SIP because of its depolymerization to benign products, but its amorphous structure and low glass-transition temperature make it unsuitable alone for coating applications. This study explored the blending of PEtG with polyesters including polycaprolactone (PCL), poly(l-lactic acid), and poly(R-3-hydroxybutyrate). Block copolymers of PEtG with PCL were also synthesized and studied. It was found that the phase separation behavior and consequently the thermal and mechanical properties of the materials could be tuned according to the composition of the blend, while the stimuli-responsive degradation of PEtG was retained in the blends. This work therefore provides a framework for the application of PEtG-based coatings in applications ranging from pharmaceuticals to agricultural products.
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Affiliation(s)
- Spencer M. Heuchan
- Department
of Biology and Department of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, The University of
Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Jarret P. MacDonald
- Department
of Biology and Department of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, The University of
Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Lukas A. Bauman
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
| | - Bo Fan
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
| | - Hugh A. L. Henry
- Department
of Biology and Department of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, The University of
Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
| | - Elizabeth R. Gillies
- Department
of Biology and Department of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, The University of
Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
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Affiliation(s)
- Quinton E. A. Sirianni
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B7
| | - Amir Rabiee Kenaree
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B7
| | - Elizabeth R. Gillies
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B7
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 5B9
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Cuthbert TJ, Hisey B, Harrison TD, Trant JF, Gillies ER, Ragogna PJ. Surprising Antibacterial Activity and Selectivity of Hydrophilic Polyphosphoniums Featuring Sugar and Hydroxy Substituents. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806412] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Tyler J. Cuthbert
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Benjamin Hisey
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Tristan D. Harrison
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - John F. Trant
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Elizabeth R. Gillies
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
- Department of Chemical and Biochemical Engineering; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Paul J. Ragogna
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
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Cuthbert TJ, Hisey B, Harrison TD, Trant JF, Gillies ER, Ragogna PJ. Surprising Antibacterial Activity and Selectivity of Hydrophilic Polyphosphoniums Featuring Sugar and Hydroxy Substituents. Angew Chem Int Ed Engl 2018; 57:12707-12710. [DOI: 10.1002/anie.201806412] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Indexed: 02/06/2023]
Affiliation(s)
- Tyler J. Cuthbert
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Benjamin Hisey
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Tristan D. Harrison
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - John F. Trant
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Elizabeth R. Gillies
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
- Department of Chemical and Biochemical Engineering; 1151 Richmond St. London ON N6A 3K7 Canada
| | - Paul J. Ragogna
- Department of Chemistry; The University of Western Ontario; 1151 Richmond St. London ON N6A 3K7 Canada
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Affiliation(s)
- Rebecca E. Yardley
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research; The University of Western Ontario, 1151 Richmond Street; London Ontario Canada N6A 5B7
| | - Elizabeth R. Gillies
- Department of Chemistry and the Centre for Advanced Materials and Biomaterials Research; The University of Western Ontario, 1151 Richmond Street; London Ontario Canada N6A 5B7
- Department of Chemical Engineering; The University of Western Ontario, 1151 Richmond Street; London Ontario Canada N6A 5B9
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41
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Affiliation(s)
- Amir Rabiee Kenaree
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
| | - Elizabeth R. Gillies
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B7
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario, Canada N6A 5B9
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Gambles M, Fan B, Borecki A, Gillies ER. Hybrid Polyester Self-Immolative Polymer Nanoparticles for Controlled Drug Release. ACS Omega 2018; 3:5002-5011. [PMID: 31458713 PMCID: PMC6641706 DOI: 10.1021/acsomega.8b00534] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 04/27/2018] [Indexed: 06/08/2023]
Abstract
Delivery systems have been developed to address problematic properties of drugs, but the specific release of drugs at their targets is still a challenge. Polymers that depolymerize end-to-end in response to the cleavage of stimuli-responsive end-caps from their termini, commonly referred to as self-immolative polymers, offer high sensitivity to stimuli and have potential for the development of new high-performance delivery systems. In this work, we prepared hybrid particles composed of varying ratios of self-immolative poly(ethyl glyoxylate) (PEtG) and slowly degrading poly(d,l-lactic acid) (PLA). These systems were designed to provide a dual release mechanism consisting of a rapid burst release of drug from the PEtG domains and a slower release from the PLA domains. Using end-caps responsive to UV light and reducing thiols, it was found that triggered particles exhibited partial degradation, as indicated by a reduction in their dynamic light-scattering count rate that depended on the PEtG:PLA ratio. The particles were also shown to release the hydrophobic dye Nile red and the drug celecoxib in a manner that depended on triggering and the PEtG:PLA ratio. In vitro toxicity assays showed an effect of the stimuli on the toxicity of the celecoxib-loaded particles but also suggested it would be ideal to replace the sodium cholate surfactant that was used in the particle synthesis procedure in order to reduce the background toxicity of the delivery system. Overall, these hybrid systems show promise for tuning and controlling the release of drugs in response to stimuli.
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Affiliation(s)
- Michael
T. Gambles
- Department
of Chemistry and the Centre for Advanced Materials and Biomaterials
Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3B7, Canada
| | - Bo Fan
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
| | - Aneta Borecki
- Department
of Chemistry and the Centre for Advanced Materials and Biomaterials
Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3B7, Canada
| | - Elizabeth R. Gillies
- Department
of Chemistry and the Centre for Advanced Materials and Biomaterials
Research, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 3B7, Canada
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
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Fan B, Salazar R, Gillies ER. Depolymerization of Trityl End-Capped Poly(Ethyl Glyoxylate): Potential Applications in Smart Packaging. Macromol Rapid Commun 2018; 39:e1800173. [PMID: 29700924 DOI: 10.1002/marc.201800173] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 03/26/2018] [Indexed: 12/28/2022]
Abstract
The temperature-dependent depolymerization of self-immolative poly(ethyl glyoxylate) (PEtG) capped with triphenylmethyl (trityl) groups is studied and its potential application for smart packaging is explored. PEtGs with four different trityl end-caps are prepared and found to undergo depolymerization to volatile products from the solid state at different rates depending on temperature and the electron-donating substituents on the trityl aromatic rings. Through the incorporation of hydrophobic dyes including Nile red and IR-780, the depolymerization is visualized as a color change of the dye as it changes from a dispersed to aggregated state. The ability of this platform to provide information on thermal history through an easily readable signal makes it promising in smart packaging applications for sensitive products such a food and other cargo that is susceptible to degradation.
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Affiliation(s)
- Bo Fan
- Department of Chemical and Biochemical Engineering and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St, London, Ontario, N6A 5B9, Canada
| | - Rómulo Salazar
- Escuela Superior Politécnica del Litoral, ESPOL, Facultad de Ingeniería en Mecánica y Ciencias de la Producción, Carrera de Ingeniería en Alimentos, Campus Gustavo Galindo Km 30.5 Vía Perimetral, ECO90902 PO Box 09-01-5863, Guayaquil, Ecuador
| | - Elizabeth R Gillies
- Department of Chemical and Biochemical Engineering and the Centre for Advanced Materials and Biomaterials Research, The University of Western Ontario, 1151 Richmond St, London, Ontario, N6A 5B9, Canada.,Department of Chemistry, The University of Western Ontario, 1151 Richmond St, London, Ontario, N6A 5B7, Canada
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Cruje C, Dunmore-Buyze J, MacDonald JP, Holdsworth DW, Drangova M, Gillies ER. Polymer Assembly Encapsulation of Lanthanide Nanoparticles as Contrast Agents for In Vivo Micro-CT. Biomacromolecules 2018; 19:896-905. [PMID: 29438616 DOI: 10.1021/acs.biomac.7b01685] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Despite recent technological advancements in microcomputed tomography (micro-CT) and contrast agent development, preclinical contrast agents are still predominantly iodine-based. Higher contrast can be achieved when using elements with higher atomic numbers, such as lanthanides; lanthanides also have X-ray attenuation properties that are ideal for spectral CT. However, the formulation of lanthanide-based contrast agents at the high concentrations required for vascular imaging presents a significant challenge. In this work, we developed an erbium-based contrast agent that meets micro-CT imaging requirements, which include colloidal stability upon redispersion at high concentrations, evasion of rapid renal clearance, and circulation times of tens of minutes in small animals. Through systematic studies with poly(ethylene glycol) (PEG)-poly(propylene glycol), PEG-polycaprolactone, and PEG-poly(l-lactide) (PLA) block copolymers, the amphiphilic block copolymer PEG114-PLA53 was identified to be ideal for encapsulating oleate-coated lanthanide-based nanoparticles for in vivo intravenous administration. We were able to synthesize a contrast agent containing 100 mg/mL of erbium that could be redispersed into colloidally stable particles in saline after lyophilization. Contrast enhancement of over 250 HU was achieved in the blood pool for up to an hour, thereby meeting the requirements of live animal micro-CT.
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45
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Abstract
Hydrogels containing phosphonium cations were synthesized and demonstrated to electrostatically bind and release anionic drug molecules depending on their structures.
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Affiliation(s)
- Tristan D. Harrison
- Department of Chemistry and The Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada N6A 5B7
| | - Paul J. Ragogna
- Department of Chemistry and The Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada N6A 5B7
| | - Elizabeth R. Gillies
- Department of Chemistry and The Centre for Materials and Biomaterials Research (CAMBR)
- The University of Western Ontario
- London
- Canada N6A 5B7
- Department of Chemical and Biochemical Engineering
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46
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Abstract
Amphiphilic block copolymers containing different self-immolative polyglyoxylates were synthesized and self-assembled to provide drug carriers with variable celecoxib loading capacities and release rates, as well as different in vitro toxicities.
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Affiliation(s)
- Bo Fan
- Department of Chemical and Biochemical Engineering and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada
| | | | - John F. Trant
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
| | - Aneta Borecki
- Department of Chemistry
- The University of Western Ontario
- London
- Canada
| | - Elizabeth R. Gillies
- Department of Chemical and Biochemical Engineering and the Centre for Advanced Materials and Biomaterials Research
- The University of Western Ontario
- London
- Canada
- Department of Chemistry
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47
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Hisey B, Buddingh JV, Gillies ER, Ragogna PJ. Effect of Counterions on the Self-Assembly of Polystyrene-Polyphosphonium Block Copolymers. Langmuir 2017; 33:14738-14747. [PMID: 29179545 DOI: 10.1021/acs.langmuir.7b03010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The ability to manipulate block copolymers on the nanoscale has led to many scientific and technological advances. These include nanoscale ordered bulk and thin films and also solution phase components; these are promising materials for making smaller ordered electronics, selective membranes, and also biomedical applications. The ability to manipulate block copolymer material architectures on such small scales has risen from thorough investigations into the properties that affect the architectures. Polyelectrolytes are an important class of polymers that are used to make amphiphilic block copolymers. In this context the authors synthesized polystyrene-b-polyphosphonium block copolymers with different anions coordinated to the polyphosphonium block in order to study the effect of the anion on the aqueous self-assembly of the polymers. The anions play an important role in the solubility of the monomeric materials which results in differences in the self-assembly observed through dynamic light scattering and transmission electron microscopy.
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Affiliation(s)
- Benjamin Hisey
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research and ‡Department of Chemical and Biochemical Engineering, The University of Western Ontario , 1151 Richmond Street, London, ON, Canada N6A 5B7
| | - Jasmine V Buddingh
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research and ‡Department of Chemical and Biochemical Engineering, The University of Western Ontario , 1151 Richmond Street, London, ON, Canada N6A 5B7
| | - Elizabeth R Gillies
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research and ‡Department of Chemical and Biochemical Engineering, The University of Western Ontario , 1151 Richmond Street, London, ON, Canada N6A 5B7
| | - Paul J Ragogna
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research and ‡Department of Chemical and Biochemical Engineering, The University of Western Ontario , 1151 Richmond Street, London, ON, Canada N6A 5B7
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48
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Affiliation(s)
- Olivier Nguon
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
- 3M Canada Company, London, Ontario, Canada
| | | | | | - Jian Li
- 3M Canada Company, London, Ontario, Canada
| | - Elizabeth R. Gillies
- Department of Chemistry, The University of Western Ontario, London, Ontario, Canada
- Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, Ontario, Canada
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49
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Affiliation(s)
- Tyler J. Cuthbert
- Department
of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, ‡Department of Physics and Astronomy and the Centre
for Advanced Materials and Biomaterials Research, and §Department of Chemical and Biochemical
Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 3K7
| | - Josh J. Jadischke
- Department
of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, ‡Department of Physics and Astronomy and the Centre
for Advanced Materials and Biomaterials Research, and §Department of Chemical and Biochemical
Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 3K7
| | - John R. de Bruyn
- Department
of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, ‡Department of Physics and Astronomy and the Centre
for Advanced Materials and Biomaterials Research, and §Department of Chemical and Biochemical
Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 3K7
| | - Paul J. Ragogna
- Department
of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, ‡Department of Physics and Astronomy and the Centre
for Advanced Materials and Biomaterials Research, and §Department of Chemical and Biochemical
Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 3K7
| | - Elizabeth R. Gillies
- Department
of Chemistry and the Centre for Advanced Materials and
Biomaterials Research, ‡Department of Physics and Astronomy and the Centre
for Advanced Materials and Biomaterials Research, and §Department of Chemical and Biochemical
Engineering, The University of Western Ontario, 1151 Richmond St., London, Ontario, Canada N6A 3K7
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50
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Fan B, Gillies ER. Poly(ethyl glyoxylate)-Poly(ethylene oxide) Nanoparticles: Stimuli-Responsive Drug Release via End-to-End Polyglyoxylate Depolymerization. Mol Pharm 2017; 14:2548-2559. [DOI: 10.1021/acs.molpharmaceut.7b00030] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bo Fan
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
| | - Elizabeth R. Gillies
- Department
of Chemical and Biochemical Engineering, The University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B9, Canada
- Department
of Chemistry, The University of Western Ontario, 1151 Richmond
Street, London, Ontario Canada, N6A 5B7
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