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Sarkar Y, Roy S, Majumder R, Das S, Bhalani DV, Ray A, Jewrajka SK, Parui PP. Protonation-induced pH increase at the triblock copolymer micelle interface for transient membrane permeability at neutral pH. SOFT MATTER 2020; 16:798-809. [PMID: 31834342 DOI: 10.1039/c9sm01002e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Achieving controlled membrane permeability using pH-responsive block copolymers is crucial for selective intercellular uptake. We have shown that the pH at the triblock-copolymer micelle interface as compared to its bulk pH can help regulate membrane permeability. The pH-dependent acid/base equilibriums of two different interface-interacting pH probes were determined in order to measure the interfacial pH for a pH-responsive triblock copolymer (TBP) micelle under a wide range of bulk pH (4.5-9.0). According to 1H NMR studies, both pH probes provided interfacial pH at a similar interfacial depth. We revealed that the protonation of the amine moiety at the micelle interface and the subsequent formation of a positive charge caused the interface to become relatively less acidic than that of the bulk as well as an increase in the bulk-to-interfacial pH deviation (ΔpH) from ∼0.9 to 1.9 with bulk pH reducing from 8.0 to 4.5. From the ΔpH vs. interface and bulk pH plots, the apparent and intrinsic protonations or positive charge formation pKa values for the micelle were estimated to be ∼7.3 and 6.0, respectively. When the TBP micelle interacted with an anionic large unilamellar vesicle (LUV) of a binary lipid (neutral and anionic) system at the bulk pH of 7.0, fluorescence leakage studies revealed that the pH increase at the micelle interface from that of the LUV interface (pH ∼ 5.5) made the micelle interface partially protonated/cationic, thereby exhibiting transient membrane permeability. Although the increasing interface protonation causes the interface to become relatively less acidic than the bulk at any bulk pH below 6.5, the pH increase at the micelle interface may not be sufficiently large to maintain the threshold for the amine-protonated condition for effecting transient leakage and therefore, a continuous leakage was observed due to the slow disruption of the lipid bilayer.
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Affiliation(s)
- Yeasmin Sarkar
- Department of Chemistry, Jadavpur University, Kolkata 700032, India.
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Bai G, Wang Y, Nichifor M, Bastos M. Critical role of the degree of substitution in the interaction of biocompatible cholic acid-modified dextrans with phosphatidylcholine liposomes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13258-13268. [PMID: 24079348 DOI: 10.1021/la402754y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The interaction between biocompatible cholic acid-modified dextrans with different pendent cholic acid groups' content and phosphatidylcholine liposomes was studied by a variety of techniques including isothermal titration calorimetry (ITC), differential scanning calorimetry (DSC), turbidity measurements, microscopy imaging (transmission electron microscopy (TEM), and cryo-scanning electron microscopy (cryo-SEM)). The variation of the interaction enthalpy with polymer concentration, as obtained by ITC, highlighted the formation of different aggregates. Complete phase modification, from vesicles covered with a few polymer chains to vesicle disintegration, was observed by turbidity measurements. DSC showed the effect of polymer addition to the liposome gel to liquid-crystalline phase transition, and microscopy images gave information about the size and morphology of the aggregates. The composition, structure, and morphology of polymer/liposome aggregates were found to be strongly influenced by the cholic acid content in the polymer (degree of substitution, DS). Along with a rather monotonous change in the polymer/liposome system's properties with increasing DS, a discontinuity in behavior could also be observed at DS = 4 mol %. For DS ≤ 4 mol %, the polymer/liposome interaction takes place mainly between individual components, and liposome disintegration occurs in a narrow concentration range, whereas for DS > 4 mol % extended physical networks are formed, which last over a wide concentration range. A mechanism of interaction, as a function of DS, is proposed and discussed in detail.
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Affiliation(s)
- Guangyue Bai
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University , Xinxiang, Henan 453007, China
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Zhao L, Liu J, Zhang L, Gao Y, Zhang Z, Luan Y. Self-assembly properties, aggregation behavior and prospective application for sustained drug delivery of a drug-participating catanionic system. Int J Pharm 2013; 452:108-15. [DOI: 10.1016/j.ijpharm.2013.04.072] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2013] [Revised: 03/22/2013] [Accepted: 04/22/2013] [Indexed: 02/08/2023]
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Ghostine RA, Markarian MZ, Schlenoff JB. Asymmetric Growth in Polyelectrolyte Multilayers. J Am Chem Soc 2013; 135:7636-46. [DOI: 10.1021/ja401318m] [Citation(s) in RCA: 172] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ramy A. Ghostine
- Department of Chemistry
and Biochemistry, The Florida State University, Tallahassee, Florida
32306-4390, United States
| | - Marie Z. Markarian
- Department of Chemistry
and Biochemistry, The Florida State University, Tallahassee, Florida
32306-4390, United States
| | - Joseph B. Schlenoff
- Department of Chemistry
and Biochemistry, The Florida State University, Tallahassee, Florida
32306-4390, United States
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Li F, Luan Y, Liu X, Pang J, Lin G, Shao W, Li Z. Characterization and Aggregation Behaviors of Mixed DDAB/SDS Solution With and Without Poly(4-styrenesulfonic Acid-Co-Maleic Acid) Sodium. J DISPER SCI TECHNOL 2011. [DOI: 10.1080/01932691.2010.528334] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Matile S, Vargas Jentzsch A, Montenegro J, Fin A. Recent synthetic transport systems. Chem Soc Rev 2011; 40:2453-74. [PMID: 21390363 DOI: 10.1039/c0cs00209g] [Citation(s) in RCA: 292] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
This critical review covers progress with synthetic transport systems, particularly ion channels and pores, between January 2006 and December 2009 in a comprehensive manner. This is the third part of a series launched in the year 2000, covering a rich collection of structural and functional motifs that should appeal to a broad audience of non-specialists, including to organic, biological, supramolecular and polymer chemists. Impressive breakthroughs have been achieved over the past four years in part because of a fruitful expansion toward new types of interactions, including metal-organic, π-π, aromatic electron donor-acceptor, anion-π or anion-macrodipole interactions as well as dynamic covalent bonds (169 references).
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Affiliation(s)
- Stefan Matile
- Department of Organic Chemistry, University of Geneva, Geneva, Switzerland.
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Li F, Luan Y, Liu X, Xu G, Li X, Li X, Wang J. Investigation on the aggregation behaviors of DDAB/NaDEHP catanionic vesicles in the absence and presence of a negatively charged polyelectrolyte. Phys Chem Chem Phys 2011; 13:5897-905. [DOI: 10.1039/c0cp01365j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Karam P, Ngo AT, Rouiller I, Cosa G. Unraveling electronic energy transfer in single conjugated polyelectrolytes encapsulated in lipid vesicles. Proc Natl Acad Sci U S A 2010; 107:17480-5. [PMID: 20876146 PMCID: PMC2955115 DOI: 10.1073/pnas.1008068107] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A method for the study of conjugated polyelectrolyte (CPE) photophysics in solution at the single-molecule level is described. Extended observation times of single polymer molecules are enabled by the encapsulation of the CPEs within 200-nm lipid vesicles, which are in turn immobilized on a surface. When combined with a molecular-level visualization of vesicles and CPE via cryo-transmission electron microscopy, these single-molecule spectroscopy studies on CPEs enable us to directly correlate the polymer conformation with its spectroscopic features. These studies are conducted with poly[5-methoxy-2-(3-sulfopropoxy)-1,4-phenylene-vinylene] (MPS-PPV, a negatively charged CPE), when encapsulated in neutral and in negatively charged lipid vesicles. MPS-PPV exists as a freely diffusing polymer when confined in negatively charged vesicles. Individual MPS-PPV molecules adopt a collapsed-chain conformation leading to efficient energy migration over multiple chromophores. Both the presence of stepwise photobleaching in fluorescence intensity-time trajectories and emission from low-energy chromophores along the chain are observed. These results correlate with the amplified sensing potential reported for MPS-PPV in aqueous solution. When confined within neutral vesicles, single MPS-PPV molecules adopt an extended conformation upon insertion in the lipid bilayer. In this case emission arises from multiple chromophores within the isolated polymer chains, leading to an exponential decay of the intensity over time and a broad blue-shifted emission spectrum.
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Affiliation(s)
- Pierre Karam
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC, Canada H3A 2K6
- Centre for Self-Assembled Chemical Structures; and
| | - An Thien Ngo
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC, Canada H3A 2K6
- Centre for Self-Assembled Chemical Structures; and
| | - Isabelle Rouiller
- Department of Anatomy and Cell Biology, McGill University, Strathcona Anatomy and Dentistry Building, Room 115, 3640 University Street, Montreal, QC, Canada H3A 2B2
| | - Gonzalo Cosa
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC, Canada H3A 2K6
- Centre for Self-Assembled Chemical Structures; and
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Smitthipong W, Neumann T, Gajria S, Li Y, Chworos A, Jaeger L, Tirrell M. Noncovalent Self-Assembling Nucleic Acid-Lipid Based Materials. Biomacromolecules 2008; 10:221-8. [DOI: 10.1021/bm800701a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wirasak Smitthipong
- Materials Research Laboratory, Department of Chemical Engineering, Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106
| | - Thorsten Neumann
- Materials Research Laboratory, Department of Chemical Engineering, Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106
| | - Surekha Gajria
- Materials Research Laboratory, Department of Chemical Engineering, Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106
| | - Youli Li
- Materials Research Laboratory, Department of Chemical Engineering, Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106
| | - Arkadiusz Chworos
- Materials Research Laboratory, Department of Chemical Engineering, Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106
| | - Luc Jaeger
- Materials Research Laboratory, Department of Chemical Engineering, Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106
| | - Matthew Tirrell
- Materials Research Laboratory, Department of Chemical Engineering, Department of Chemistry and Biochemistry, and Department of Physics, University of California, Santa Barbara, California 93106
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