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Morrow JP, Mazrad ZAI, Warne NM, Ayton S, Bush AI, Kempe K. Schiff-Base Cross-Linked Poly(2-oxazoline) Micelle Drug Conjugates Possess Antiferroptosis Activity in Numerous In Vitro Cell Models. Biomacromolecules 2024; 25:1068-1083. [PMID: 38178625 DOI: 10.1021/acs.biomac.3c01106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
A great deal of nanocarriers have been applied to induce ferroptosis in cancer research, yet there are limited examples of nanocarrier formulations to rescue ferroptosis, which can be applied to neurodegeneration, inflammation, liver damage, kidney disease, and more. Here, we present the synthesis, characterization, and in vitro evaluation of pH-responsive, core-cross-linked micelle (CCM) ferrostatin-1 (Fer-1) conjugates with amine, valproic acid, and biotin surface chemistries. Fer-1 release from stable and defined CCM Fer-1 conjugates was quantified, highlighting the sustained release for 24 h. CCM Fer-1 conjugates demonstrated excellent ferroptosis rescue by their antilipid peroxidation activity in a diverse set of cell lines in vitro. Additionally, CCMs showed tunable cell association in SH-SY5Y and translocation across an in vitro blood-brain barrier (BBB) model, highlighting potential brain disease applications. Overall, here, we present a polymeric Fer-1 delivery system to enhance Fer-1 action, which could help in improving Fer-1 action in the treatment of ferroptosis-related diseases.
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Affiliation(s)
- Joshua P Morrow
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Zihnil A I Mazrad
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Nicole M Warne
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Scott Ayton
- Melbourne Dementia Research Centre, The Florey Institute for Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC 3052, Australia
| | - Ashley I Bush
- Melbourne Dementia Research Centre, The Florey Institute for Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC 3052, Australia
| | - Kristian Kempe
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
- Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia
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2
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Van Guyse JFR, Bernhard Y, Podevyn A, Hoogenboom R. Non-activated Esters as Reactive Handles in Direct Post-Polymerization Modification. Angew Chem Int Ed Engl 2023; 62:e202303841. [PMID: 37335931 DOI: 10.1002/anie.202303841] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 05/26/2023] [Accepted: 06/19/2023] [Indexed: 06/21/2023]
Abstract
Non-activated esters are prominently featured functional groups in polymer science, as ester functional monomers display great structural diversity and excellent compatibility with a wide range of polymerization mechanisms. Yet, their direct use as a reactive handle in post-polymerization modification has been typically avoided due to their low reactivity, which impairs the quantitative conversion typically desired in post-polymerization modification reactions. While activated ester approaches are a well-established alternative, the modification of non-activated esters remains a synthetic and economically valuable opportunity. In this review, we discuss past and recent efforts in the utilization of non-activated ester groups as a reactive handle to facilitate transesterification and aminolysis/amidation reactions, and the potential of the developed methodologies in the context of macromolecular engineering.
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Affiliation(s)
- Joachim F R Van Guyse
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
- Leiden Academic Center for Drug Research (LACDR), Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands
| | - Yann Bernhard
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
- Université de Lorraine, UMR CNRS 7053 L2CM, Faculté des Sciences et Technologies, BP 70239, 54506, Vandoeuvre-lès-Nancy Cedex, France
| | - Annelore Podevyn
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
| | - Richard Hoogenboom
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, 9000 Ghent, Belgium
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3
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Yang T, Huang C, Jia J, Wu F, Ni F. A Facile Synthesis of 2-Oxazolines via Dehydrative Cyclization Promoted by Triflic Acid. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27249042. [PMID: 36558175 PMCID: PMC9781752 DOI: 10.3390/molecules27249042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 12/10/2022] [Accepted: 12/15/2022] [Indexed: 12/23/2022]
Abstract
2-oxazolines are common moieties in numerous natural products, pharmaceuticals, and functional copolymers. Current methods for synthesizing 2-oxazolines mainly rely on stoichiometric dehydration agents or catalytic dehydration promoted by specific catalysts. These conditions either generate stoichiometric amounts of waste or require forcing azeotropic reflux conditions. As such, a practical and robust method that promotes dehydrative cyclization while generating no byproducts would be attractive to oxazoline production. Herein, we report a triflic acid (TfOH)-promoted dehydrative cyclization of N-(2-hydroxyethyl)amides for synthesizing 2-oxazolines. This reaction tolerates various functional groups and generates water as the only byproduct. This method affords oxazoline with inversion of α-hydroxyl stereochemistry, suggesting that alcohol is activated as a leaving group under these conditions. Furthermore, the one-pot synthesis protocol of 2-oxazolines directly from carboxylic acids and amino alcohols is also provided.
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Affiliation(s)
- Tao Yang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
| | - Chengjie Huang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
| | - Jingyang Jia
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
| | - Fan Wu
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
- Correspondence: (F.W.); (F.N.)
| | - Feng Ni
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
- Correspondence: (F.W.); (F.N.)
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4
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Effect of hydrophobic modification of block copolymers on the self-assembly, drug encapsulation and release behavior. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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5
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Quader S, Van Guyse JFR. Bioresponsive Polymers for Nanomedicine-Expectations and Reality! Polymers (Basel) 2022; 14:polym14173659. [PMID: 36080733 PMCID: PMC9460233 DOI: 10.3390/polym14173659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2022] [Revised: 08/26/2022] [Accepted: 08/28/2022] [Indexed: 12/18/2022] Open
Abstract
Bioresponsive polymers in nanomedicine have been widely perceived to selectively activate the therapeutic function of nanomedicine at diseased or pathological sites, while sparing their healthy counterparts. This idea can be described as an advanced version of Paul Ehrlich’s magic bullet concept. From that perspective, the inherent anomalies or malfunction of the pathological sites are generally targeted to allow the selective activation or sensory function of nanomedicine. Nonetheless, while the primary goals and expectations in developing bioresponsive polymers are to elicit exclusive selectivity of therapeutic action at diseased sites, this remains difficult to achieve in practice. Numerous research efforts have been undertaken, and are ongoing, to tackle this fine-tuning. This review provides a brief introduction to key stimuli with biological relevance commonly featured in the design of bioresponsive polymers, which serves as a platform for critical discussion, and identifies the gap between expectations and current reality.
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Affiliation(s)
- Sabina Quader
- Innovation Center of NanoMedicine, Kawasaki Institute of Industrial Promotion, 3-25-14 Tonomachi, Kawasaki-ku, Kawasaki 212-0821, Japan
- Correspondence: (S.Q.); (J.F.R.V.G.)
| | - Joachim F. R. Van Guyse
- Innovation Center of NanoMedicine, Kawasaki Institute of Industrial Promotion, 3-25-14 Tonomachi, Kawasaki-ku, Kawasaki 212-0821, Japan
- Leiden Academic Center for Drug Research (LACDR), Leiden University, 2333 CC Leiden, The Netherlands
- Correspondence: (S.Q.); (J.F.R.V.G.)
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7
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Polyoxazoline: A review article from polymerization to smart behaviors and biomedical applications. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111484] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Morrow JP, Mazrad ZAI, Bush AI, Kempe K. Poly(2-oxazoline) - Ferrostatin-1 drug conjugates inhibit ferroptotic cell death. J Control Release 2022; 350:193-203. [PMID: 35944752 DOI: 10.1016/j.jconrel.2022.08.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 07/15/2022] [Accepted: 08/04/2022] [Indexed: 10/15/2022]
Abstract
Ferroptosis is a form of non-apoptotic iron induced cell death mechanism implicated in neurodegeneration, yet can be ameliorated with potent radical scavengers such as ferrostatin-1 (Fer-1). Currently, Fer-1 suffers from low water solubility, poor biodistribution profile and is unsuitable for clinical application. Fer-1 polymer-drug conjugates (PDCs) for testing as an anti-ferroptosis therapeutic candidate have yet to be described. Here, we report the synthesis and characterization of a library of water-soluble Fer-1 based poly(2-oxazoline)-drug conjugates. The cationic ring opening polymerization (CROP) of water-soluble 2-oxazoline monomers, and a novel protected aromatic aldehyde 2-oxazoline (DPhOx), produced defined copolymers, which after deprotection were available for modification with Fer-1 via reductive amination and Schiff base chemistry. The conjugates were tested for their activity against RSL3-induced ferroptosis in vitro, and first structure-activity relationships were established. Irreversibly conjugated Fer-1 PDCs possessing an arylamine structural motif showed a greatly increased anti-ferroptosis activity compared to reversibly (Schiff base) linked Fer-1. Overall, this work introduces the first active ferrostatin-PDCs and a new highly tuneable poly(2-oxazoline)-based PDC platform, which provides access to next generation polymeric nanomaterials for anti-ferroptosis applications.
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Affiliation(s)
- Joshua P Morrow
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Zihnil A I Mazrad
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia
| | - Ashley I Bush
- Melbourne Dementia Research Centre, The Florey Institute for Neuroscience and Mental Health, The University of Melbourne, Parkville, VIC 3052, Australia
| | - Kristian Kempe
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC 3052, Australia; Materials Science and Engineering, Monash University, Clayton, VIC 3800, Australia,.
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9
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Van Guyse JFR, Leiske MN, Verjans J, Bernhard Y, Hoogenboom R. Accelerated Post‐Polymerization Amidation of Polymers with Side‐Chain Ester Groups by Intramolecular Activation. Angew Chem Int Ed Engl 2022; 61:e202201781. [DOI: 10.1002/anie.202201781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Joachim F. R. Van Guyse
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
- Present address: Innovation Center of NanoMedicine Kawasaki Institute of Industrial Promotion 3-25-14, Tonomachi, Kawasaki-ku Kawasaki 210-0821 Japan
| | - Meike N. Leiske
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
| | - Jente Verjans
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
| | - Yann Bernhard
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
- Present address: Université de Lorraine, UMR CNRS 7053 L2CM Faculté des Sciences et Technologies, BP 70239 54506 Vandoeuvre-lès-Nancy Cedex France
| | - Richard Hoogenboom
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
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10
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Van Guyse JFR, Leiske MN, Verjans J, Bernhard Y, Hoogenboom R. Accelerated Post‐Polymerization Amidation of Polymers with Side‐Chain Ester Groups by Intramolecular Activation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202201781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Joachim F. R. Van Guyse
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
- Present address: Innovation Center of NanoMedicine Kawasaki Institute of Industrial Promotion 3-25-14, Tonomachi, Kawasaki-ku Kawasaki 210-0821 Japan
| | - Meike N. Leiske
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
| | - Jente Verjans
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
| | - Yann Bernhard
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
- Present address: Université de Lorraine, UMR CNRS 7053 L2CM Faculté des Sciences et Technologies, BP 70239 54506 Vandoeuvre-lès-Nancy Cedex France
| | - Richard Hoogenboom
- Supramolecular Chemistry Group Centre of Macromolecular Chemistry (CMaC) Department of Organic and Macromolecular Chemistry Ghent University Krijgslaan 281 S4 9000 Ghent Belgium
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11
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Soleymani Movahed F, Foo SW, Mori S, Ogawa S, Saito S. Phosphorus-Based Organocatalysis for the Dehydrative Cyclization of N-(2-Hydroxyethyl)amides into 2-Oxazolines. J Org Chem 2021; 87:243-257. [PMID: 34882422 DOI: 10.1021/acs.joc.1c02318] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A metal-free, biomimetic catalytic protocol for the cyclization of N-(2-hydroxyethyl)amides to the corresponding 2-oxazolines (4,5-dihydrooxazoles), promoted by the 1,3,5,2,4,6-triazatriphosphorine (TAP)-derived organocatalyst tris(o-phenylenedioxy)cyclotriphosphazene (TAP-1) has been developed. This approach requires less precatalyst compared to the reported relevant systems, with respect to the phosphorus atom (the maximum turnover number (TON) ∼ 30), and exhibits a broader substrate scope and higher functional-group tolerance, providing the functionalized 2-oxazolines with retention of the configuration at the C(4) stereogenic center of the 2-oxazolines. Widely accessible β-amino alcohols can be used in this approach, and the cyclization of N-(2-hydroxyethyl)amides provides the desired 2-oxazolines in up to 99% yield. The mechanism of the reaction was studied by monitoring the reaction using spectral and analytical methods, whereby an 18O-labeling experiment furnished valuable insights. The initial step involves a stoichiometric reaction between the substrate and TAP-1, which leads to the in situ generation of the catalyst, a catechol cyclic phosphate, as well as to a pyrocatechol phosphate and two possible active intermediates. The dehydrative cyclization was also successfully conducted on the gram scale.
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Affiliation(s)
| | - Siong Wan Foo
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Shogo Mori
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Saeko Ogawa
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
| | - Susumu Saito
- Graduate School of Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan.,Research Center for Materials Science, Nagoya University, Chikusa, Nagoya 464-8602, Japan
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12
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Park JR, Verderosa AD, Totsika M, Hoogenboom R, Dargaville TR. Thermoresponsive Polymer-Antibiotic Conjugates Based on Gradient Copolymers of 2-Oxazoline and 2-Oxazine. Biomacromolecules 2021; 22:5185-5194. [PMID: 34726387 DOI: 10.1021/acs.biomac.1c01133] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A polymer-antibiotic conjugate with thermoresponsive properties near body temperature is presented. The backbone polymer is a copolymer of 2-n-propyl-2-oxazine (PropOzi) and methoxycarbonylethyl-2-oxazoline (C2MestOx) which is conjugated with the broad-spectrum antibiotic, cefazolin, via modification of the methyl ester group of C2MestOx. The resulting polymer-antibiotic conjugate has a cloud point temperature near body temperature, meaning that it can form a homogenous solution if cooled, but when injected into a skin-mimic at 37 °C, it forms a drug depot precipitate. Cleavage of the ester linker leads to quantitative release of the pristine cefazolin (with some antibiotic degradation observed) and redissolution of the polymer. When Escherichia coli were treated with polymer-antibiotic conjugate total clearance is observed within 12 h. The power of this approach is the potential for localized antibiotic delivery, for example, at a specific tissue site or into infected phagocytic cells.
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Affiliation(s)
- Jong-Ryul Park
- Centre for Materials Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - Anthony D Verderosa
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland 4006, Australia
| | - Makrina Totsika
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Queensland 4006, Australia
| | - Richard Hoogenboom
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, Ghent B-9000, Belgium
| | - Tim R Dargaville
- Centre for Materials Science, School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland 4000, Australia
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13
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Van Guyse JFR, Bera D, Hoogenboom R. Adamantane Functionalized Poly(2-oxazoline)s with Broadly Tunable LCST-Behavior by Molecular Recognition. Polymers (Basel) 2021; 13:374. [PMID: 33530443 PMCID: PMC7865518 DOI: 10.3390/polym13030374] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 01/20/2021] [Accepted: 01/21/2021] [Indexed: 01/27/2023] Open
Abstract
Smart or adaptive materials often utilize stimuli-responsive polymers, which undergo a phase transition in response to a given stimulus. So far, various stimuli have been used to enable the modulation of drug release profiles, cell-interactive behavior, and optical and mechanical properties. In this respect, molecular recognition is a powerful tool to fine-tune the stimuli-responsive behavior due to its high specificity. Within this contribution, a poly(2-oxazoline) copolymer bearing adamantane side chains was synthesized via triazabicyclodecene-catalyzed amidation of the ester side chains of a poly(2-ethyl-2-oxazoline-stat-2-methoxycarbonylpropyl-2-oxazoline) statistical copolymer. Subsequent complexation of the pendant adamantane groups with sub-stoichiometric amounts (0-1 equivalents) of hydroxypropyl β-cyclodextrin or β-cyclodextrin enabled accurate tuning of its lower critical solution temperature (LCST) over an exceptionally wide temperature range, spanning from 30 °C to 56 °C. Furthermore, the sharp thermal transitions display minimal hysteresis, suggesting a reversible phase transition of the complexed polymer chains (i.e., the β-cyclodextrin host collapses together with the polymers) and a minimal influence by the temperature on the supramolecular association. Analysis of the association constant of the polymer with hydroxypropyl β-cyclodextrin via 1H NMR spectroscopy suggests that the selection of the macrocyclic host and rational polymer design can have a profound influence on the observed thermal transitions.
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Affiliation(s)
| | | | - Richard Hoogenboom
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium; (J.F.R.V.G.); (D.B.)
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14
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Park JR, Bolle ECL, Santos Cavalcanti AD, Podevyn A, Van Guyse JFR, Forget A, Hoogenboom R, Dargaville TR. Injectable biocompatible poly(2-oxazoline) hydrogels by strain promoted alkyne-azide cycloaddition. Biointerphases 2021; 16:011001. [PMID: 33401918 DOI: 10.1116/6.0000630] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Poly(2-alkyl-2-oxazoline) (PAOx) hydrogels are tailorable synthetic materials with demonstrated biomedical applications, thanks to their excellent biocompatibility and tunable properties. However, their use as injectable hydrogels is challenging as it requires invasive surgical procedures to insert the formed hydrogel into the body due to their nonsoluble 3D network structures. Herein, we introduce cyclooctyne and azide functional side chains to poly(2-oxazoline) copolymers to induce in situ gelation using strain promoted alkyne-azide cycloaddition. The gelation occurs rapidly, within 5 min, under physiological conditions when two polymer solutions are simply mixed. The influence of several parameters, such as temperature and different aqueous solutions, and stoichiometric ratios between the two polymers on the structural properties of the resultant hydrogels have been investigated. The gel formation within tissue samples was verified by subcutaneous injection of the polymer solution into an ex vivo model. The degradation study of the hydrogels in vitro showed that the degradation rate was highly dependent on the type of media, ranging from days to a month. This result opens up the potential uses of PAOx hydrogels in attempts to achieve optimal, injectable drug delivery systems and tissue engineering.
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Affiliation(s)
- Jong-Ryul Park
- Institute of Health and Biomedical Innovation, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Eleonore C L Bolle
- Institute of Health and Biomedical Innovation, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Amanda Dos Santos Cavalcanti
- Institute of Health and Biomedical Innovation, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia
| | - Annelore Podevyn
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B-9000 Ghent, Belgium
| | - Joachim F R Van Guyse
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B-9000 Ghent, Belgium
| | - Aurelien Forget
- Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-St. 31, Freiburg, 79104, Germany
| | - Richard Hoogenboom
- Supramolecular Chemistry Group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 S4, B-9000 Ghent, Belgium
| | - Tim R Dargaville
- Institute of Health and Biomedical Innovation, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia
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