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Li X, Lin H, Yu Y, Lu Y, He B, Liu M, Zhuang L, Xu Y, Li W. In Situ Rapid-Formation Sprayable Hydrogels for Challenging Tissue Injury Management. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2400310. [PMID: 38298099 DOI: 10.1002/adma.202400310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2024] [Revised: 01/20/2024] [Indexed: 02/02/2024]
Abstract
Rapid-acting, convenient, and broadly applicable medical materials are in high demand for the treatment of extensive and intricate tissue injuries in extremely medical scarcity environment, such as battlefields, wilderness, and traffic accidents. Conventional biomaterials fail to meet all the high criteria simultaneously for emergency management. Here, a multifunctional hydrogel system capable of rapid gelation and in situ spraying, addressing clinical challenges related to hemostasis, barrier establishment, support, and subsequent therapeutic treatment of irregular, complex, and urgent injured tissues, is designed. This hydrogel can be fast formed in less than 0.5 s under ultraviolet initiation. The precursor maintains an impressively low viscosity of 0.018 Pa s, while the hydrogel demonstrates a storage modulus of 0.65 MPa, achieving the delicate balance between sprayable fluidity and the mechanical strength requirements in practice, allowing flexible customization of the hydrogel system for differentiated handling and treatment of various tissues. Notably, the interactions between the component of this hydrogel and the cell surface protein confer upon its inherently bioactive functionalities such as osteogenesis, anti-inflammation, and angiogenesis. This research endeavors to provide new insights and designs into emergency management and complex tissue injuries treatment.
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Affiliation(s)
- Xiaolei Li
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
- Fels Cancer Institute for Personalized Medicine, Lewis-Katz School of Medicine, Temple University, Philadelphia, PA, 19140, USA
| | - Han Lin
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
| | - Yilin Yu
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
| | - Yukun Lu
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
| | - Bin He
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
| | - Meng Liu
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
| | - Lin Zhuang
- School of Physics, State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Provincial Key Laboratory of Photovoltaics Technologies, Sun Yat-sen University, Guangzhou, 510006, P. R. China
| | - Yue Xu
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
| | - Weichang Li
- Hospital of Stomatology, Guangdong Provincial Key Laboratory of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, 510055, P. R. China
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2
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McCarthy DR, Xu K, Schenkelberg ME, Balegamire NAN, Liang H, Bellino SA, Li J, Schneebeli ST. Kinetically controlled synthesis of rotaxane geometric isomers. Chem Sci 2024; 15:4860-4870. [PMID: 38550687 PMCID: PMC10967009 DOI: 10.1039/d3sc04412b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 01/24/2024] [Indexed: 04/30/2024] Open
Abstract
Geometric isomerism in mechanically interlocked systems-which arises when the axle of a mechanically interlocked molecule is oriented, and the macrocyclic component is facially dissymmetric-can provide enhanced functionality for directional transport and polymerization catalysis. We now introduce a kinetically controlled strategy to control geometric isomerism in [2]rotaxanes. Our synthesis provides the major geometric isomer with high selectivity, broadening synthetic access to such interlocked structures. Starting from a readily accessible [2]rotaxane with a symmetrical axle, one of the two stoppers is activated selectively for stopper exchange by the substituents on the ring component. High selectivities are achieved in these reactions, based on coupling the selective formation reactions leading to the major products with inversely selective depletion reactions for the minor products. Specifically, in our reaction system, the desired (major) product forms faster in the first step, while the undesired (minor) product subsequently reacts away faster in the second step. Quantitative 1H NMR data, fit to a detailed kinetic model, demonstrates that this effect (which is conceptually closely related to minor enantiomer recycling and related processes) can significantly improve the intrinsic selectivity of the reactions. Our results serve as proof of principle for how multiple selective reaction steps can work together to enhance the stereoselectivity of synthetic processes forming complex mechanically interlocked molecules.
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Affiliation(s)
- Dillon R McCarthy
- Departments of Chemistry, Pathology, and Materials Science Program, University of Vermont Burlington VT 05405 USA
| | - Ke Xu
- Departments of Industrial & Molecular Pharmaceutics, Chemistry, and Medicinal Chemistry & Molecular Pharmacology, Purdue University West Lafayette IN 47907 USA
| | - Mica E Schenkelberg
- Departments of Chemistry, Pathology, and Materials Science Program, University of Vermont Burlington VT 05405 USA
- Departments of Industrial & Molecular Pharmaceutics, Chemistry, and Medicinal Chemistry & Molecular Pharmacology, Purdue University West Lafayette IN 47907 USA
| | - Nils A N Balegamire
- Departments of Chemistry, Pathology, and Materials Science Program, University of Vermont Burlington VT 05405 USA
- Departments of Industrial & Molecular Pharmaceutics, Chemistry, and Medicinal Chemistry & Molecular Pharmacology, Purdue University West Lafayette IN 47907 USA
| | - Huiming Liang
- Departments of Chemistry, Pathology, and Materials Science Program, University of Vermont Burlington VT 05405 USA
| | - Shea A Bellino
- Departments of Chemistry, Pathology, and Materials Science Program, University of Vermont Burlington VT 05405 USA
| | - Jianing Li
- Departments of Chemistry, Pathology, and Materials Science Program, University of Vermont Burlington VT 05405 USA
- Departments of Industrial & Molecular Pharmaceutics, Chemistry, and Medicinal Chemistry & Molecular Pharmacology, Purdue University West Lafayette IN 47907 USA
| | - Severin T Schneebeli
- Departments of Chemistry, Pathology, and Materials Science Program, University of Vermont Burlington VT 05405 USA
- Departments of Industrial & Molecular Pharmaceutics, Chemistry, and Medicinal Chemistry & Molecular Pharmacology, Purdue University West Lafayette IN 47907 USA
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3
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Kim K, Park MH. Role of Functionalized Peptides in Nanomedicine for Effective Cancer Therapy. Biomedicines 2024; 12:202. [PMID: 38255307 PMCID: PMC10813321 DOI: 10.3390/biomedicines12010202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2023] [Revised: 01/05/2024] [Accepted: 01/12/2024] [Indexed: 01/24/2024] Open
Abstract
Peptide-functionalized nanomedicine, which addresses the challenges of specificity and efficacy in drug delivery, is emerging as a pivotal approach for cancer therapy. Globally, cancer remains a leading cause of mortality, and conventional treatments, such as chemotherapy, often lack precision and cause adverse effects. The integration of peptides into nanomedicine offers a promising solution for enhancing the targeting and delivery of therapeutic agents. This review focuses on the three primary applications of peptides: cancer cell-targeting ligands, building blocks for self-assembling nanostructures, and elements of stimuli-responsive systems. Nanoparticles modified with peptides improved targeting of cancer cells, minimized damage to healthy tissues, and optimized drug delivery. The versatility of self-assembled peptide structures makes them an innovative vehicle for drug delivery by leveraging their biocompatibility and diverse nanoarchitectures. In particular, the mechanism of cell death induced by self-assembled structures offers a novel approach to cancer therapy. In addition, peptides in stimuli-responsive systems enable precise drug release in response to specific conditions in the tumor microenvironment. The use of peptides in nanomedicine not only augments the efficacy and safety of cancer treatments but also suggests new research directions. In this review, we introduce systems and functionalization methods using peptides or peptide-modified nanoparticles to overcome challenges in the treatment of specific cancers, including breast cancer, lung cancer, colon cancer, prostate cancer, pancreatic cancer, liver cancer, skin cancer, glioma, osteosarcoma, and cervical cancer.
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Affiliation(s)
- Kibeom Kim
- Convergence Research Center, Nanobiomaterials Institute, Sahmyook University, Seoul 01795, Republic of Korea;
- Department of Chemistry and Life Science, Sahmyook University, Seoul 01795, Republic of Korea
| | - Myoung-Hwan Park
- Convergence Research Center, Nanobiomaterials Institute, Sahmyook University, Seoul 01795, Republic of Korea;
- Department of Chemistry and Life Science, Sahmyook University, Seoul 01795, Republic of Korea
- Department of Convergence Science, Sahmyook University, Seoul 01795, Republic of Korea
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4
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Karagrigoriou D, Berking BB, Wang Q, Sánchez-Cerrillo DM, Galimberti DR, Wilson DA, Neumann K. Unveiling the Antifouling Potential of Stabilized Poly(phosphorus ylides). ACS Macro Lett 2023; 12:1608-1613. [PMID: 37956403 PMCID: PMC10734299 DOI: 10.1021/acsmacrolett.3c00524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Revised: 11/06/2023] [Accepted: 11/09/2023] [Indexed: 11/15/2023]
Abstract
Zwitterionic polymers have emerged as highly attractive building blocks for antifouling coatings in biomedical applications. Notably, these polymers offer effective alternatives to the widely used poly(ethylene glycol) (PEG), which has raised concerns regarding its immunotoxicity and the development of PEG-specific antibodies. Polymeric ylides, a largely overlooked class of zwitterionic polymers, have been reported as effective antifouling scaffolds. However, the reported subclasses, poly(sulfur ylides) and N-oxides, lack structural diversity and chemical variability. In this study, we present the synthesis and characterization of polymeric phosphorus ylides as an unexplored class of poly(ylides) with significantly increased structural diversity, which is of high value when designing future ylide-based antifouling materials. Our findings demonstrate that, owing to their low dipole moments and hydration layers, these polymeric phosphorus ylides significantly reduce bacterial attachment. Furthermore, we observe selective toxicity toward bacteria rather than mammalian cells. The bactericidal nature of poly(phosphorus ylides), coupled with their expanded chemical space, provides a distinct advantage over existing materials, including zwitterionic polymers from betaine scaffolds. We anticipate that these unexplored structures will broaden the scope of antifouling applications for poly(ylides).
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Affiliation(s)
- Dimitrios Karagrigoriou
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Bela B. Berking
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Qi Wang
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Dulce M. Sánchez-Cerrillo
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Daria R. Galimberti
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Daniela A. Wilson
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Kevin Neumann
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
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5
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Berking BB, Mallen-Huertas L, Rijpkema SJ, Wilson DA. Porous Polymersomes as Carriers for Silver Nanoparticles and Nanoclusters: Advantages of Compartmentalization for Antimicrobial Usage. Biomacromolecules 2023; 24:5905-5914. [PMID: 37949646 PMCID: PMC10716846 DOI: 10.1021/acs.biomac.3c00925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 10/31/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023]
Abstract
The global threat to public health posed by antibiotic-resistant bacterial infections requires the exploration of innovative approaches. Nanomaterials, particularly silver nanoparticles (AgNPs) and nanoclusters (AgNCs), have emerged as potential solutions to address the pressing issue of a bacterial healthcare crisis. However, the high cytotoxicity levels and low stability associated with AgNPs and AgNCs limit their applicability. To overcome these challenges, AgNCs and AgNPs were synthesized in the presence of porous polymersomes, resulting in a compartmentalized system that enhances stability, reduces cytotoxicity, and maintains high antimicrobial activity. The encapsulated particles exhibit a distribution of silver components on both the surface and the core, which is confirmed through the analysis of surface charge and center of mass. Moreover, our investigation demonstrates improved stability of the nanoparticles and nanoclusters upon entrapment in the porous system, as evidenced by the ion release assay. The antimicrobial effectiveness of porous polymersomes containing AgNPs and AgNCs was demonstrated by visualizing the biofilms and quantifying the penetration depth. Furthermore, cytotoxicity studies showed that compartmentalization increases cell compatibility for AgNC-based systems, showcasing the many advantages this system holds.
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Affiliation(s)
| | | | - Sjoerd J. Rijpkema
- Systems Chemistry Department,
Institute for Molecules and Materials, Radboud
University, Nijmegen 6500 HC, The Netherlands
| | - Daniela A. Wilson
- Systems Chemistry Department,
Institute for Molecules and Materials, Radboud
University, Nijmegen 6500 HC, The Netherlands
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6
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Xia T, Tong Z, Xie Y, Arno MC, Lei S, Xiao L, Rho JY, Ferguson CTJ, Manners I, Dove AP, O’Reilly RK. Tuning the Functionality of Self-Assembled 2D Platelets in the Third Dimension. J Am Chem Soc 2023; 145:25274-25282. [PMID: 37938914 PMCID: PMC10682995 DOI: 10.1021/jacs.3c08770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 10/12/2023] [Accepted: 10/13/2023] [Indexed: 11/10/2023]
Abstract
The decoration of 2D nanostructures using heteroepitaxial growth is of great importance to achieve functional assemblies employed in biomedical, electrical, and mechanical applications. Although the functionalization of polymers before self-assembly has been investigated, the exploration of direct surface modification in the third dimension from 2D nanostructures has, to date, been unexplored. Here, we used living crystallization-driven self-assembly to fabricate poly(ε-caprolactone)-based 2D platelets with controlled size. Importantly, surface modification of the platelets in the third dimension was achieved by using functional monomers and light-induced polymerization. This method allows us to selectively regulate the height and fluorescence properties of the nanostructures. Using this approach, we gained unprecedented spatial control over the surface functionality in the specific region of complex 2D platelets.
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Affiliation(s)
- Tianlai Xia
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
| | - Zaizai Tong
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
- College
of Materials Science and Engineering, Zhejiang
Sci-Tech University, Hangzhou 310018, People’s
Republic of China
| | - Yujie Xie
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
| | - Maria C. Arno
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
- Institute
of Cancer and Genomic Sciences, University
of Birmingham, Edgbaston, Birmingham B15 2TT, U.K.
| | - Shixing Lei
- Department
of Chemistry, University of Victoria, Victoria, BC V8P 5C2, Canada
| | - Laihui Xiao
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
| | - Julia Y. Rho
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
| | - Calum T. J. Ferguson
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
| | - Ian Manners
- Department
of Chemistry, University of Victoria, Victoria, BC V8P 5C2, Canada
- Centre
for Advanced Materials and Related Technology (CAMTEC), University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada
| | - Andrew P. Dove
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
| | - Rachel K. O’Reilly
- School
of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, U.K.
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7
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Berking BB, Poulladofonou G, Karagrigoriou D, Wilson DA, Neumann K. Zwitterionic Polymeric Sulfur Ylides with Minimal Charge Separation Open a New Generation of Antifouling and Bactericidal Materials. Angew Chem Int Ed Engl 2023; 62:e202308971. [PMID: 37597250 DOI: 10.1002/anie.202308971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 08/04/2023] [Accepted: 08/14/2023] [Indexed: 08/21/2023]
Abstract
Zwitterionic polymers are widely employed hydrophilic building blocks for antifouling coatings with numerous applications across a wide range of fields, including but not limited to biomedical science, drug delivery and nanotechnology. Zwitterionic polymers are considered as an attractive alternative to polyethylene glycol because of their biocompatibility and effectiveness to prevent formation of biofilms. To this end, zwitterionic polymers are classified in two categories, namely polybetaines and polyampholytes. Yet, despite a fundamental interest to drive the development of new antifouling materials, the chemical composition of zwitterionic polymer remains severely limited. Here, we show that poly(sulfur ylides) that belong to the largely overlooked class of poly(ylides), effectively prevent the formation of biofilms from pathogenic bacteria. While surface energy analysis reveals strong hydrogen-bond acceptor capabilities of poly(sulfur ylide), membrane damage of pathogenic bacteria induced by poly(sulfur ylides) indicates toxicity towards bacteria while not affecting eucaryotic cells. Such synergistic effect of poly(sulfur ylides) offers distinct advantages over polyethylene glycol when designing new antifouling materials. We expect that our findings will pave the way for the development of a range of ylide-based materials with antifouling properties that have yet to be explored, opening up new directions at the interface of chemistry, biology, and material science.
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Affiliation(s)
- Bela B Berking
- Systems Chemistry Department, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Georgia Poulladofonou
- Systems Chemistry Department, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Dimitrios Karagrigoriou
- Systems Chemistry Department, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Daniela A Wilson
- Systems Chemistry Department, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
| | - Kevin Neumann
- Systems Chemistry Department, Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands
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8
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Wong CK, Lai RY, Stenzel MH. Dynamic metastable polymersomes enable continuous flow manufacturing. Nat Commun 2023; 14:6237. [PMID: 37802997 PMCID: PMC10558441 DOI: 10.1038/s41467-023-41883-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 09/19/2023] [Indexed: 10/08/2023] Open
Abstract
Polymersomes are polymeric analogues of liposomes with exceptional physical and chemical properties. Despite being dubbed as next-generation vesicles since their inception nearly three decades ago, polymersomes have yet to experience translation into the clinical or industrial settings. This is due to a lack of reliable methods to upscale production without compromising control over polymersome properties. Herein we report a continuous flow methodology capable of producing near-monodisperse polymersomes at scale (≥3 g/h) with the possibility of performing downstream polymersome manipulation. Unlike conventional polymersomes, our polymersomes exhibit metastability under ambient conditions, persisting for a lifetime of ca. 7 days, during which polymersome growth occurs until a dynamic equilibrium state is reached. We demonstrate how this metastable state is key to the implementation of downstream processes to manipulate polymersome size and/or shape in the same continuous stream. The methodology operates in a plug-and-play fashion and is applicable to various block copolymers.
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Affiliation(s)
- Chin Ken Wong
- School of Chemistry, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia.
| | - Rebecca Y Lai
- School of Chemistry, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Martina H Stenzel
- School of Chemistry, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia.
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Abstract
A wide range of biomaterials and engineered cell surfaces are composed of bioconjugates embedded in liposome membranes, surface-immobilized bilayers, or the plasma membranes of living cells. This review article summarizes the various ways that Nature anchors integral and peripheral proteins in a cell membrane and describes the strategies devised by chemical biologists to label a membrane protein in living cells. Also discussed are modern synthetic and semisynthetic methods to produce lipidated proteins. Subsequent sections describe methods to anchor a three-component synthetic construct that is composed of a lipophilic membrane anchor, hydrophilic linker, and exposed functional component. The surface exposed payload can be a fluorophore, aptamer, oligonucleotide, polypeptide, peptide nucleic acid, polysaccharide, branched dendrimer, or linear polymer. Hydrocarbon chains are commonly used as the membrane anchor, and a general experimental trend is that a two chain lipid anchor has higher membrane affinity than a cholesteryl or single chain lipid anchor. Amphiphilic fluorescent dyes are effective molecular probes for cell membrane imaging and a zwitterionic linker between the fluorophore and the lipid anchor promotes high persistence in the plasma membrane of living cells. A relatively new advance is the development of switchable membrane anchors as molecular tools for fundamental studies or as technology platforms for applied biomaterials.
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Affiliation(s)
- Rananjaya S Gamage
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Jordan L Chasteen
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Bradley D Smith
- Department of Chemistry and Biochemistry, 251 Nieuwland Science Hall, University of Notre Dame, Notre Dame, Indiana 46556, United States
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