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Tomara M, Selianitis D, Pispas S. Dual-Responsive Amphiphilic P(DMAEMA-co-LMA-co-OEGMA) Terpolymer Nano-Assemblies in Aqueous Media. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12213791. [PMID: 36364568 PMCID: PMC9659099 DOI: 10.3390/nano12213791] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 10/04/2022] [Accepted: 10/24/2022] [Indexed: 06/12/2023]
Abstract
This work reports on the synthesis and self-assembly of a novel series of dual-responsive poly[2-(dimethylamino)ethylmethacrylate-co-laurylmethacrylate-co-(oligoethyleneglycol)methacrylate], P(DMAEMA-co-LMA-co-OEGMA)statistical terpolymers in aqueous solutions. Five P(DMAEMA-co-LMA-co-OEGMA) amphiphilic terpolymers, having different content of the three monomers, were synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. The success of the synthesis was confirmed by the molecular characterization of the terpolymers via size exclusion chromatography (SEC) for the determination of molecular weights and the molecular weight distributions. By using nuclear magnetic resonance (1H-NMR) and Fourier-transform infrared (FTIR) spectroscopy, it was possible to determine the exact composition of the terpolymers. Dynamic light scattering (DLS) and fluorescence spectroscopy (FS) indicated the formation of P(DMAEMA-co-LMA-co-OEGMA) unimolecular or multichain aggregates in aqueous solutions, as a response to pH, temperature and ionic strength changes, with their dimensions being largely affected. The amphiphilic terpolymers were able to encapsulate the hydrophobic drug curcumin (CUR) and demonstrate stability to fetal bovine serum (FBS) solutions. These terpolymer aggregates were studied by DLS, FS and UV-Vis, and it was found that they may have been used as potential nanocarriers for drug delivery and bio-imaging applications.
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Treatment strategies for HIV infection with emphasis on role of CRISPR/Cas9 gene: Success so far and road ahead. Eur J Pharmacol 2022; 931:175173. [DOI: 10.1016/j.ejphar.2022.175173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 07/15/2022] [Accepted: 07/21/2022] [Indexed: 11/20/2022]
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Jana S, Uchman M. Poly(2-oxazoline)-based stimulus-responsive (Co)polymers: An overview of their design, solution properties, surface-chemistries and applications. Prog Polym Sci 2020. [DOI: 10.1016/j.progpolymsci.2020.101252] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Imamura R, Mori H. Protein-Stabilizing Effect of Amphiphilic Block Copolymers with a Tertiary Sulfonium-Containing Zwitterionic Segment. ACS OMEGA 2019; 4:18234-18247. [PMID: 31720524 PMCID: PMC6844099 DOI: 10.1021/acsomega.9b02209] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 10/08/2019] [Indexed: 06/10/2023]
Abstract
Tertiary sulfonium-containing zwitterionic block copolymers consisting of N-acryloyl-l-methionine methyl sulfonium salt (A-Met(S+)-OH) and n-butyl acrylate (BA) were newly synthesized to develop a novel protein stabilizer. The zwitterionic block copolymers were prepared by reversible addition-fragmentation chain-transfer (RAFT) polymerization of BA using a hydrophilic macro-chain-transfer agent (CTA) obtained from N-acryloyl-l-methionine (A-Met-OH) and subsequent postmodification. RAFT polymerization of A-Met-OH using poly(BA) macro-CTA, followed by postmodification, also afforded the target poly(A-Met(S+)-OH)-b-poly(BA). The block copolymers stabilized horseradish peroxidase (HRP) during storage at 37 °C for 5 days, and the protein-stabilizing effect was enhanced with increase in the A-Met(S+)-OH content. In particular, the block copolymer with ∼85% A-Met(S+)-OH content showed a significant protein-stabilizing effect at a temperature (37 °C) higher than the room temperature, which is highly desirable for practical and industrial applications. The addition of sucrose into the block copolymer-protein solution led to a considerable increase in the HRP activity under the same conditions. Excellent alkaline phosphatase stabilization at 37 °C for 12 days was also achieved using the block copolymers. The zwitterionic block copolymers with the optimal hydrophilic/hydrophobic balance were found to serve as efficient protein-stabilizing agents, in comparison with the corresponding homopolymer and random copolymers. Dynamic light scattering, zeta potential, transmission electron microscopy, and circular dichroism measurements revealed that the zwitterionic block copolymer stabilizes an enzyme by wrapping with a slight change in the size, whereas the secondary and ordered structures of the enzyme are maintained.
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Affiliation(s)
- Ryutaro Imamura
- Graduate School
of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
- NOF Corporation, 5-10 Tokodai, Tsukuba, Ibaraki 300-2635, Japan
| | - Hideharu Mori
- Graduate School
of Organic Materials Science, Yamagata University, 4-3-16 Jonan, Yonezawa, Yamagata 992-8510, Japan
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Vlassi E, Papagiannopoulos A, Pispas S. Hydrolyzed Poly(2-plenyl-2-oxazoline)s in Aqueous Media and Biological Fluids. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201800047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Eleni Vlassi
- Theoretical and Physical Chemistry Institute; National Hellenic Research Foundation; 48 Vassileos Constantinou Avenue ,11635 Athens Greece
| | - Aristeidis Papagiannopoulos
- Theoretical and Physical Chemistry Institute; National Hellenic Research Foundation; 48 Vassileos Constantinou Avenue ,11635 Athens Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute; National Hellenic Research Foundation; 48 Vassileos Constantinou Avenue ,11635 Athens Greece
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Feiner-Gracia N, Buzhor M, Fuentes E, Pujals S, Amir RJ, Albertazzi L. Micellar Stability in Biological Media Dictates Internalization in Living Cells. J Am Chem Soc 2017; 139:16677-16687. [PMID: 29076736 DOI: 10.1021/jacs.7b08351] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The dynamic nature of polymeric assemblies makes their stability in biological media a crucial parameter for their potential use as drug delivery systems in vivo. Therefore, it is essential to study and understand the behavior of self-assembled nanocarriers under conditions that will be encountered in vivo such as extreme dilutions and interactions with blood proteins and cells. Herein, using a combination of fluorescence spectroscopy and microscopy, we studied four amphiphilic PEG-dendron hybrids and their self-assembled micelles in order to determine their structure-stability relations. The high molecular precision of the dendritic block enabled us to systematically tune the hydrophobicity and stability of the assembled micelles. Using micelles that change their fluorescent properties upon disassembly, we observed that serum proteins bind to and interact with the polymeric amphiphiles in both their assembled and monomeric states. These interactions strongly affected the stability and enzymatic degradation of the micelles. Finally, using spectrally resolved confocal imaging, we determined the relations between the stability of the polymeric assemblies in biological media and their cell entry. Our results highlight the important interplay between molecular structure, micellar stability, and cell internalization pathways, pinpointing the high sensitivity of stability-activity relations to minor structural changes and the crucial role that these relations play in designing effective polymeric nanostructures for biomedical applications.
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Affiliation(s)
- Natalia Feiner-Gracia
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology , Baldiri Reixac 15-21, 08028 Barcelona, Spain
| | - Marina Buzhor
- Department of Organic Chemistry, School of Chemistry, Faculty of Exact Sciences, Tel-Aviv University , Tel-Aviv 6997801, Israel.,Tel Aviv University Center for Nanoscience and Nanotechnology, Tel-Aviv University , Tel-Aviv 6997801, Israel
| | - Edgar Fuentes
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology , Baldiri Reixac 15-21, 08028 Barcelona, Spain
| | - Sílvia Pujals
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology , Baldiri Reixac 15-21, 08028 Barcelona, Spain
| | - Roey J Amir
- Department of Organic Chemistry, School of Chemistry, Faculty of Exact Sciences, Tel-Aviv University , Tel-Aviv 6997801, Israel.,Tel Aviv University Center for Nanoscience and Nanotechnology, Tel-Aviv University , Tel-Aviv 6997801, Israel.,BLAVATNIK CENTER for Drug Discovery, Tel-Aviv University , Tel-Aviv 6997801, Israel
| | - Lorenzo Albertazzi
- Institute for Bioengineering of Catalonia (IBEC), The Barcelona Institute of Science and Technology , Baldiri Reixac 15-21, 08028 Barcelona, Spain
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