1
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Ghosh S, Chatterjee S, Satpati P. Effect of Spacer Length Modification of the Cationic Side Chain on the Energetics of Antimicrobial Peptide Binding to Membrane-Mimetic Bilayers. J Chem Inf Model 2023; 63:5823-5833. [PMID: 37684221 DOI: 10.1021/acs.jcim.3c01080] [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: 09/10/2023]
Abstract
Understanding the mechanism of action of the antimicrobial peptide (AMP) in terms of its structure and energetics is the key to designing new potent and selective AMPs. Recently, we reported a membranolytic 14-residue-long lysine-rich cationic antimicrobial peptide (LL-14: NH3+-LKWLKKLLKWLKKL-CONH2) against Pseudomonas aeruginosa, Klebsiella pneumoniae, and Staphylococcus aureus, which is limited by cytotoxicity and expected to undergo facile protease degradation. Aliphatic side-chain-length modification of the cationic amino-acid residues (Lys and Arg) is a popular strategy for designing protease-resistant AMPs. However, the effect of the peptide side-chain length modifications on the membrane binding affinity and its relation to the atomic structure remain an unsolved problem. We report computer simulations that quantitatively calculated the difference in peptide binding affinity to membrane-mimetic-bilayer models (bacterial: 1-palmitoyl-2-oleoyl-phosphatidylethanolamine (POPE)/1-palmitoyl-2-oleoyl-phosphatidylglycerol (POPG) bilayer and mammalian: 1-palmitoyl-2-oleoyl-phosphatidylcholine (POPC) bilayer) upon decreasing or increasing the spacer length of the cationic lysine residues of LL-14 (as well as their arginine analogues). We show that the peptide/bilayer interaction energetics varies drastically in response to spacer length modification. The strength of peptide discrimination depends strongly on the nature of the bilayer (bacterial or mammalian mimetic model). An increase in the lysine spacer length by one carbon (i.e., homolysine analogue of LL-14) is weakly/strongly disfavored by the bacterial/mammalian-membrane-mimetic bilayer. Recently, we have demonstrated an excellent correlation between the antimicrobial activity of the membranolytic cationic peptides and their binding affinity to membrane-mimetic-bilayer models. Thus, the homolysine analogue of LL-14 is a promising noncytotoxic AMP with conserved activity. On the other hand, homoarginine analogue (arginine spacer length increment by a single carbon) was preferred by both the bacteria and the mammalian mimetic bilayers and displayed the strongest affinity for the former among the peptides studied in this work. Thus, the promising most potent homoarginine analogue is likely to be cytotoxic. Shortening the Lys/Arg side chain to a three-carbon spacer (Dab/Agb) improves the binding affinity to bacterial and mammalian-membrane-mimetic bilayers. Arginine and arginine-derivative peptides exhibited stronger binding affinity to the bilayers relative to the lysine analogue. The results provide a plausible explanation to the previous experimental observations, viz., superior antimicrobial activity of the arginine peptides relative to Lys peptides and the improvement of antimicrobial activity upon substitution of Lys with Dab in the cationic peptides. The simulations revealed that the small change in the peptide hydrophobicity by Lys/Arg spacer length modification could drastically alter the energetics of peptide/bilayer binding by fine-tuning the electrostatic interactions. The energetics underlying the peptide selectivity by simple membrane-mimetic bilayer models may be beneficial for designing new selective and protease-resistant AMPs.
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Affiliation(s)
- Suvankar Ghosh
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Sunanda Chatterjee
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Priyadarshi Satpati
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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2
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Garg S, Peeters M, Mahajan RK, Singla P. Loading of hydrophobic drug silymarin in pluronic and reverse pluronic mixed micelles. J Drug Deliv Sci Technol 2022. [DOI: 10.1016/j.jddst.2022.103699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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3
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Sarkar P, Chattopadhyay A. Membrane Dipole Potential: An Emerging Approach to Explore Membrane Organization and Function. J Phys Chem B 2022; 126:4415-4430. [PMID: 35696090 DOI: 10.1021/acs.jpcb.2c02476] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Biological membranes are complex organized molecular assemblies of lipids and proteins that provide cells and membrane-bound intracellular organelles their individual identities by morphological compartmentalization. Membrane dipole potential originates from the electrostatic potential difference within the membrane due to the nonrandom arrangement (orientation) of amphiphile and solvent (water) dipoles at the membrane interface. In this Feature Article, we will focus on the measurement of dipole potential using electrochromic fluorescent probes and highlight interesting applications. In addition, we will focus on ratiometric fluorescence microscopic imaging technique to measure dipole potential in cellular membranes, a technique that can be used to address novel problems in cell biology which are otherwise difficult to address using available approaches. We envision that membrane dipole potential could turn out to be a convenient tool in exploring the complex interplay between membrane lipids and proteins and could provide novel insights in membrane organization and function.
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Affiliation(s)
- Parijat Sarkar
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
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4
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Balafouti A, Pispas S. P(
OEGMA‐co‐LMA
) hyperbranched amphiphilic copolymers as self‐assembled nanocarriers. JOURNAL OF POLYMER SCIENCE 2022. [DOI: 10.1002/pol.20220078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Anastasia Balafouti
- Theoretical and Physical Chemistry Institute National Hellenic Research Foundation Athens Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute National Hellenic Research Foundation Athens Greece
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5
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Nesterkina M, Smola S, Rusakova N, Kravchenko I. Terpenoid Hydrazones as Biomembrane Penetration Enhancers: FT-IR Spectroscopy and Fluorescence Probe Studies. Molecules 2021; 27:molecules27010206. [PMID: 35011438 PMCID: PMC8746376 DOI: 10.3390/molecules27010206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/27/2021] [Accepted: 12/29/2021] [Indexed: 11/16/2022] Open
Abstract
Hydrazones based on mono- and bicyclic terpenoids (verbenone, menthone and carvone) have been investigated in vitro as potential biomembrane penetration enhancers. In this regard, liposomes composed of lecithin or cardiolipin as phospholipid phase components with incorporated fluorescence probes have been prepared using the thin-film ultrasonic dispersion method. The mean particle size of the obtained liposomes, established using laser diffraction, was found to be 583 ± 0.95 nm, allowing us to categorize them as multilamellar vesicles (MLVs) according to their morphology. Pursuant to fluorescence analysis, we may assume a reduction in microviscosity and, consequently, a decrease in the packing density of lecithin and cardiolipin lipids to be the major mechanism of action for terpenoid hydrazones 1–15. In order to determine the molecular organization of the lipid matrix, lipids were isolated from rat strata cornea (SCs) and their interaction with tested compounds was studied by means of Fourier transform infrared spectroscopy. FT-IR examination suggested that these hydrazones fluidized the SC lipids via the disruption of the hydrogen-bonded network formed by polar groups of SC constituents. The relationship between the structure of terpenoid hydrazones and their ability to enhance biomembrane penetration is discussed.
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Affiliation(s)
- Mariia Nesterkina
- Department of Organic and Pharmaceutical Technologies, Odessa National Polytechnic University, 65044 Odessa, Ukraine;
- Correspondence: ; Tel.: +38-093-713-38-53
| | - Serhii Smola
- A.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, 65080 Odessa, Ukraine; (S.S.); (N.R.)
| | - Nataliya Rusakova
- A.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, 65080 Odessa, Ukraine; (S.S.); (N.R.)
| | - Iryna Kravchenko
- Department of Organic and Pharmaceutical Technologies, Odessa National Polytechnic University, 65044 Odessa, Ukraine;
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6
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Inulin-Based Polymeric Micelles Functionalized with Ocular Permeation Enhancers: Improvement of Dexamethasone Permeation/Penetration through Bovine Corneas. Pharmaceutics 2021; 13:pharmaceutics13091431. [PMID: 34575507 PMCID: PMC8472490 DOI: 10.3390/pharmaceutics13091431] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 09/03/2021] [Accepted: 09/07/2021] [Indexed: 12/28/2022] Open
Abstract
Ophthalmic drug delivery is still a challenge due to the protective barriers of the eye. A common strategy to promote drug absorption is the use of ocular permeation enhancers, while an innovative approach is the use of polymeric micelles. In the present work, the two mentioned approaches were coupled by conjugating ocular permeation enhancers (PEG2000, carnitine, creatine, taurine) to an inulin-based co-polymer (INU-EDA-RA) in order to obtain self-assembling biopolymers with permeation enhancer properties for the hydrophobic drug dexamethasone (DEX). Inulin derivatives were properly synthetized, were found to expose about 2% mol/mol of enhancer molecules in the side chain, and resulted able to self-assemble at various concentrations by varying the pH and the ionic strength of the medium. Moreover, the ability of polymeric micelles to load dexamethasone was demonstrated, and size, mucoadhesiveness, and cytocompatibility against HCE cells were evaluated. Furthermore, the efficacy of the permeation enhancer was evaluated by ex vivo permeation studies to determine the performance of the used enhancers, which resulted in PEG2000 > CAR > TAU > CRE, while entrapment ability studies resulted in CAR > TAU > PEG2000 > CRE, both for fluorescent-labelled and DEX-loaded micelles. Finally, an increase in terms of calculated Kp and Ac parameters was demonstrated, compared with the values calculated for DEX suspension.
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7
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Liu W, Liu D, Yin H, Yang C, Lu K. Foam fractionation for the separation of SDBS from its aqueous solution: Process optimization and property test. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118305] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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8
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Teychené J, Didacus-Prins D, Chouini-Lalanne N, Déjugnat C, Sartor V. Formulation induces direct DNA UV-A photooxidation. Part II. Pro-oxidant effect of formulated Vitamin E via generation of singlet oxygen. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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9
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Srivastava A, Yañez O, Cantero-López P. Mixed micellization of bile salts and transglycosylated stevia and enhanced binding and solubility of non-steroidal anti-inflammatory drugs using mixed micelle. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113341] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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10
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Enhanced micellization of Gemini surfactants using diphenhydramine hydrochloride as an organic counterion. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.112288] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Liu Q, Yang D, Shang T, Guo L, Yang B, Xu X. Chain conformation transition induced host–guest assembly between triple helical curdlan and β-CD for drug delivery. Biomater Sci 2020; 8:1638-1648. [PMID: 31970339 DOI: 10.1039/c9bm01439j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A novel kind of supramolecular micelle consisting of the triplex curdlan and β-CDs was firstly developed via the conformation transition induced host–guest interaction.
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Affiliation(s)
- Qingye Liu
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan 030051
- China
- College of Chemistry and Molecular Sciences
| | - Du Yang
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan 030051
- China
| | - Tongyi Shang
- The Sixth Affiliated Hospital of Guangzhou Medical University; Department of Biomedical Engineering
- School of Basic Medical Sciences
- Guangzhou Medical University
- Guangzhou 511436
- China
| | - Lixiao Guo
- School of Chemical Engineering and Technology
- North University of China
- Taiyuan 030051
- China
| | - Bin Yang
- The Sixth Affiliated Hospital of Guangzhou Medical University; Department of Biomedical Engineering
- School of Basic Medical Sciences
- Guangzhou Medical University
- Guangzhou 511436
- China
| | - Xiaojuan Xu
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- China
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12
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Vaezi Z, Bortolotti A, Luca V, Perilli G, Mangoni ML, Khosravi-Far R, Bobone S, Stella L. Aggregation determines the selectivity of membrane-active anticancer and antimicrobial peptides: The case of killerFLIP. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1862:183107. [PMID: 31678022 DOI: 10.1016/j.bbamem.2019.183107] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 07/19/2019] [Accepted: 09/19/2019] [Indexed: 01/02/2023]
Abstract
Host defense peptides selectively kill bacterial and cancer cells (including those that are drug-resistant) by perturbing the permeability of their membranes, without being significantly toxic to the host. Coulombic interactions between these cationic and amphipathic peptides and the negatively charged membranes of pathogenic cells contribute to the selective toxicity. However, a positive charge is not sufficient for selectivity, which can be achieved only by a finely tuned balance of electrostatic and hydrophobic driving forces. A common property of amphipathic peptides is the formation of aggregated structures in solution, but the role of this phenomenon in peptide activity and selectivity has received limited attention. Our data on the anticancer peptide killerFLIP demonstrate that aggregation strongly increases peptide selectivity, by reducing the effective peptide hydrophobicity and thus the affinity towards membranes composed of neutral lipids (like the outer layer of healthy eukaryotic cell membranes). Aggregation is therefore a useful tool to modulate the selectivity of membrane active peptides and peptidomimetics.
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Affiliation(s)
- Zahra Vaezi
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Annalisa Bortolotti
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Vincenzo Luca
- Laboratory affiliated to Pasteur Italia-Fondazione Cenci Bolognetti, Department of Biochemical Sciences, Sapienza University of Rome, piazzale Aldo Moro, 5, 00185 Rome, Italy
| | - Giulia Perilli
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy
| | - Maria Luisa Mangoni
- Laboratory affiliated to Pasteur Italia-Fondazione Cenci Bolognetti, Department of Biochemical Sciences, Sapienza University of Rome, piazzale Aldo Moro, 5, 00185 Rome, Italy
| | - Roya Khosravi-Far
- BiomaRx Inc, Cambridge, MA, USA; Department of Pathology, Harvard Medical School and Beth Israel Deaconess Medical Center, Boston, MA, USA
| | - Sara Bobone
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy.
| | - Lorenzo Stella
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133 Rome, Italy.
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13
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Zahid NI, Ji L, Khyasudeen MF, Friedrich A, Hashim R, Marder TB, Abou-Zied OK. Evidence of Increased Hydrophobicity and Dynamics inside the Tail Region of Glycolipid Self-Assemblies Using 2- n-Alkyl-Pyrene Derivatives to Probe Different Locations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9584-9592. [PMID: 31287700 DOI: 10.1021/acs.langmuir.9b01767] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
New designer biofluorophores are being increasingly used in the investigation of complex cellular processes. In this study, we utilized new derivatives of pyrene (Py), i.e., 2-n-alkyl-pyrenes (Py-C4 and Py-C8), in order to probe different regions inside the hydrophobic tail of n-dodecyl β-d-maltoside (βMal-C12) in two different phases (cubic ↔ lamellar). Although the sensitivity to the local environment is reduced compared to that of Py, attaching C4 and C8 at the 2-position of Py can provide a possible means to probe the local hydrophobicity in different parts of the tail region. The absence of excimer fluorescence and the ratio of the vibronic fluorescence peak intensities (I1/I3) in a lipid environment indicate the existence of Py as monomers in the hydrophobic region, similar to hydrophobic solvation, yet close to the headgroup region. When Py is replaced by Py-C4 and Py-C8, there is a small increase in hydrophobicity (reduction in I1/I3) as the Py moiety is pulled deeper inside the tail region of both cubic and lamellar phases. The larger space of the tail region in the lamellar phase is reflected as more local hydrophobicity measured by the probes which can penetrate deep inside, whereas the curved structure of the cubic phase limits the available space for the probes. Three fluorescence lifetime components were measured in lipid, indicating the heterogeneous nature of the hydrophobic region. In the lamellar phase, a large reduction in the average lifetime value, led by the long decay component, was measured for Py-C4 (reduction by 25%) and Py-C8 (45%) compared to that of the parent Py. This observation suggests the presence of a mechanism of interaction more collisional than static between the Py moiety and the tail region of the bilayer unit due to the ample space provided by the lamellar phase as the probe is buried deeper inside the hydrophobic region. A much smaller effect was observed in the cubic phase and was correlated with the tight environment around the probes, which stems from the increased curvature of the cubic phase. The current results provide a deeper understanding of the hydrophobic region during phase transition of lipid self-assembly which is important for better control during the process of membrane-protein crystallization.
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Affiliation(s)
- N Idayu Zahid
- Department of Chemistry, Faculty of Science , Sultan Qaboos University , P.O. Box 36, Postal Code 123 , Muscat , Sultanate of Oman
- Centre for Fundamental and Frontier Sciences in Nanostructure Self-Assembly, Department of Chemistry, Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Lei Ji
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland, 97074 Würzburg , Germany
| | - M Faisal Khyasudeen
- Department of Chemistry, Faculty of Science , Sultan Qaboos University , P.O. Box 36, Postal Code 123 , Muscat , Sultanate of Oman
- Centre for Fundamental and Frontier Sciences in Nanostructure Self-Assembly, Department of Chemistry, Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Alexandra Friedrich
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland, 97074 Würzburg , Germany
| | - Rauzah Hashim
- Centre for Fundamental and Frontier Sciences in Nanostructure Self-Assembly, Department of Chemistry, Faculty of Science , University of Malaya , 50603 Kuala Lumpur , Malaysia
| | - Todd B Marder
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland, 97074 Würzburg , Germany
| | - Osama K Abou-Zied
- Department of Chemistry, Faculty of Science , Sultan Qaboos University , P.O. Box 36, Postal Code 123 , Muscat , Sultanate of Oman
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14
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Birhan YS, Hailemeskel BZ, Mekonnen TW, Hanurry EY, Darge HF, Andrgie AT, Chou HY, Lai JY, Hsiue GH, Tsai HC. Fabrication of redox-responsive Bi(mPEG-PLGA)-Se 2 micelles for doxorubicin delivery. Int J Pharm 2019; 567:118486. [PMID: 31260783 DOI: 10.1016/j.ijpharm.2019.118486] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 06/15/2019] [Accepted: 06/28/2019] [Indexed: 12/12/2022]
Abstract
Stimuli-responsive polymeric nanostructures have emerged as potential drug carriers for cancer therapy. Herein, we synthesized redox-responsive diselenide bond containing amphiphilic polymer, Bi(mPEG-PLGA)-Se2 from mPEG-PLGA and 3,3'-diselanediyldipropanoic acid (DSeDPA) using DCC/DMAP as coupling agents. Due to its amphiphilic nature, Bi(mPEG-PLGA)-Se2 self-assembled in to stable micelles in aqueous solution with a hydrodynamic size of 123.9 ± 0.85 nm. The Bi(mPEG-PLGA)-Se2 micelles exhibited DOX-loading content (DLC) of 6.61 wt% and encapsulation efficiency (EE) of 54.9%. The DOX-loaded Bi(mPEG-PLGA)-Se2 micelles released 73.94% and 69.54% of their cargo within 72 h upon treatment with 6 mM GSH and 0.1% H2O2, respectively, at pH 7.4 and 37 °C. The MTT assay results demonstrated that Bi(mPEG-PLGA)-Se2 was devoid of any inherent toxicity and the DOX-loaded micelles showed pronounced antitumor activities against HeLa cells, 44.46% of cells were viable at maximum dose of 7.5 µg/mL. The cellular uptake experiment further confirmed the internalization of DOX-loaded Bi(mPEG-PLGA)-Se2 micelles and endowed redox stimuli triggered drug release in cytosol and nuclei of cancer cells. Overall, the results suggested that the smart, biocompatible Bi(mPEG-PLGA)-Se2 copolymer could serve as potential drug delivery biomaterial for the controlled release of hydrophobic drugs in cancer cells.
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Affiliation(s)
- Yihenew Simegniew Birhan
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC
| | - Balkew Zewge Hailemeskel
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC
| | - Tefera Worku Mekonnen
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC
| | - Endiries Yibru Hanurry
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC
| | - Haile Fentahun Darge
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC
| | - Abegaz Tizazu Andrgie
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC
| | - Hsiao-Ying Chou
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC
| | - Juin-Yih Lai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC; Advanced Membrane Materials Center, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC; R&D Center for Membrane Technology, Chung Yuan Christian University, Chungli, Taoyuan 320, Taiwan, ROC
| | - Ging-Ho Hsiue
- Department of Chemical Engineering, National Chung Hsing University, Taichung 402, Taiwan, ROC.
| | - Hsieh-Chih Tsai
- Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC; Advanced Membrane Materials Center, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC.
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15
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Di Sacco F, Pucci A, Raffa P. Versatile Multi-Functional Block Copolymers Made by Atom Transfer Radical Polymerization and Post-Synthetic Modification: Switching from Volatile Organic Compound Sensors to Polymeric Surfactants for Water Rheology Control via Hydrolysis. NANOMATERIALS 2019; 9:nano9030458. [PMID: 30893878 PMCID: PMC6474081 DOI: 10.3390/nano9030458] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 03/09/2019] [Accepted: 03/13/2019] [Indexed: 11/23/2022]
Abstract
Novel, multipurpose terpolymers based on styrene (PS), tert-butyl methacrylate (tBMA) and glycidyl methacrylate (GMA), have been synthesized via Atom Transfer Radical Polymerization (ATRP). Post-synthetic modification with 1-pyrenemethylamine (AMP) allows non-covalent functionalization of carbon nanotubes, eventually yielding a conductive nanocomposite materials capable of interacting with different Volatile Organic Compounds (VOCs) by electrical resistance variation upon exposure. Moreover, facile hydrolysis of the tBMA group yields polyelectrolytic macrosurfactants with remarkable thickening properties for promising applications in water solution, such as Enhanced Oil Recovery (EOR).
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Affiliation(s)
- Federico Di Sacco
- Zernike Institute for Advance Materials, University of Groningen, AG 9747 Groningen, The Netherlands.
- Dutch Polymer Institute (DPI), P.O. Box 902, 5600 AX Eindhoven, The Netherlands.
| | - Andrea Pucci
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via Giuseppe Moruzzi 13, 56124 Pisa (PI), Italy.
| | - Patrizio Raffa
- Department of Chemical Engineering, ENTEG institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
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Di Prima G, Bongiovì F, Palumbo FS, Pitarresi G, Licciardi M, Giammona G. Mucoadhesive PEGylated inulin-based self-assembling nanoparticles: In vitro and ex vivo transcorneal permeation enhancement of corticosteroids. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2018.10.028] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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17
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Rao BD, Shrivastava S, Pal S, Chattopadhyay A. Effect of Local Anesthetics on the Organization and Dynamics of Hippocampal Membranes: A Fluorescence Approach. J Phys Chem B 2018; 123:639-647. [DOI: 10.1021/acs.jpcb.8b10232] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Bhagyashree D. Rao
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
- CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201 002, India
| | - Sandeep Shrivastava
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
| | - Sreetama Pal
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
- CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad 500 007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201 002, India
| | - Amitabha Chattopadhyay
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
- Academy of Scientific and Innovative Research, Ghaziabad 201 002, India
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18
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Nesterkina M, Smola S, Kravchenko I. Effect of esters based on terpenoids and GABA on fluidity of phospholipid membranes. J Liposome Res 2018; 29:239-246. [DOI: 10.1080/08982104.2018.1538238] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Mariia Nesterkina
- Department of Organic and Pharmaceutical Technology, Odessa National Polytechnic University, Odessa, Ukraine
- Department of Pharmaceutical Chemistry, I.I. Mechnikov Odessa National University, Odessa, Ukraine
| | - Sergii Smola
- A.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine, Odessa, Ukraine
| | - Iryna Kravchenko
- Department of Organic and Pharmaceutical Technology, Odessa National Polytechnic University, Odessa, Ukraine
- Department of Pharmaceutical Chemistry, I.I. Mechnikov Odessa National University, Odessa, Ukraine
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19
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Developing Effective Separation of Feldspar and Quartz While Recycling Tailwater by HF Pretreatment. MINERALS 2018. [DOI: 10.3390/min8040149] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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20
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Singla P, Singh O, Chabba S, Aswal VK, Mahajan RK. Sodium deoxycholate mediated enhanced solubilization and stability of hydrophobic drug Clozapine in pluronic micelles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 191:143-154. [PMID: 29028506 DOI: 10.1016/j.saa.2017.10.015] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 10/05/2017] [Accepted: 10/06/2017] [Indexed: 05/04/2023]
Abstract
In this report, the solubilization behaviour of a hydrophobic drug Clozapine (CLZ) in micellar suspensions of pluronics having different hydrophilic lipophilic balance (HLB) ratios viz. P84, F127 and F108 in the absence and presence of bile salt sodium deoxycholate (SDC) has been studied. UV-Vis spectroscopy has been exploited to determine the solubilization capacity of the investigated micellar systems in terms of drug loading efficiency, average number of drug molecules solubilized per micelle (ns), partition coefficient (P) and standard free energy of solubilization (∆G°). The morphological and structural changes taking place in pluronics in different concentration regimes of SDC and with the addition of drug CLZ has been explored using dynamic light scattering (DLS) and small angle neutron scattering (SANS) measurements. The SANS results revealed that aggregation behaviour of pluronic-SDC mixed micelles gets improved in the presence of drug. The micropolarity measurements have been performed to shed light on the locus of solubilization of the drug in pure and mixed micellar systems. The compatibility between CLZ and drug carriers (pluronics and SDC) was confirmed using powder X-ray diffraction (PXRD) and Fourier transform infrared spectroscopy (FTIR) techniques. Among the investigated systems, P84-SDC mixed system was found to be highly efficient for CLZ loading. The long term stability data indicated that CLZ loaded P84-SDC mixed micellar formulation remained stable for 3months at room temperature. Further, it was revealed that the CLZ loaded P84-SDC mixed micelles are converted into CLZ loaded pure P84 micelles at 30-fold dilutions which remain stable up to 48-fold dilutions. The results from the present studies suggest that P84-SDC mixed micelles can serve as suitable delivery vehicles for hydrophobic drug CLZ.
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Affiliation(s)
- Pankaj Singla
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India
| | - Onkar Singh
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India
| | - Shruti Chabba
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Rakesh Kumar Mahajan
- Department of Chemistry, UGC-Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India.
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21
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Hussain E, Hu Z, Zhou H, He C, Shahzad SA, Yu C. Benzo[ghi]perylene and coronene: ratiometric fluorescent probes for the sensing of microenvironment changes and micelle formation in aqueous medium. NEW J CHEM 2018. [DOI: 10.1039/c8nj00739j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Benzo[ghi]perylene and coronene were used as ratiometric fluorescent probes to monitor microenvironment changes and monomer–micelle transition for the first time.
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Affiliation(s)
- Ejaz Hussain
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
| | - Zhenzhen Hu
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
| | - Huipeng Zhou
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
| | - Chunhua He
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
| | - Sohail Anjum Shahzad
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
| | - Cong Yu
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- P. R. China
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22
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Racheva R, Tietgens N, Kerner M, Smirnova I. In situ continuous countercurrent cloud point extraction of microalgae cultures. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2017.08.066] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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Di Prima G, Saladino S, Bongiovì F, Adamo G, Ghersi G, Pitarresi G, Giammona G. Novel inulin-based mucoadhesive micelles loaded with corticosteroids as potential transcorneal permeation enhancers. Eur J Pharm Biopharm 2017; 117:385-399. [DOI: 10.1016/j.ejpb.2017.05.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 05/03/2017] [Accepted: 05/12/2017] [Indexed: 12/20/2022]
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24
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Meher G, Chakraborty H. Organization and dynamics of Trp14 of hemagglutinin fusion peptide in membrane mimetic environment. Chem Phys Lipids 2017; 205:48-54. [DOI: 10.1016/j.chemphyslip.2017.04.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 04/14/2017] [Accepted: 04/26/2017] [Indexed: 01/01/2023]
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25
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Malik S, Ghosh A, Sar P, Mondal MH, Mahali K, Saha B. Employment of different spectroscopic tools for the investigation of chromium(VI) oxidation of acetaldehyde in aqueous micellar medium. J CHEM SCI 2017. [DOI: 10.1007/s12039-017-1276-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Guo Q, Zhang Z, Song Y, Liu S, Gao W, Qiao H, Guo L, Wang J. Investigation on interaction of DNA and several cationic surfactants with different head groups by spectroscopy, gel electrophoresis and viscosity technologies. CHEMOSPHERE 2017; 168:599-605. [PMID: 27838032 DOI: 10.1016/j.chemosphere.2016.11.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 10/01/2016] [Accepted: 11/05/2016] [Indexed: 06/06/2023]
Abstract
In this study, the interaction between DNA and several cationic surfactants with different head groups such as ethyl hexadecyl dimethyl ammonium bromide (EHDAB), hexadecyl dimethyl benzyl ammonium chloride (HDBAC), and cetyl pyridinium bromide (CPB) were investigated by UV-vis absorption, fluorescence and circular dichroism (CD) spectroscopy, gel electrophoresis, and viscosity technologies. The results show that these cationic surfactants can interact with DNA and major binding modes are electrostatic and hydrophobic. Also, CPB and HDBAC molecules interact with DNA by partial intercalation, and CPB has slightly stronger intercalation than HDBAC, while EHDAB interacts with DNA by non-intercalation. The different head groups of the surfactant molecules can influence the interaction strength. CPB has the stronger interaction with DNA than the others. Moreover, surfactant concentration, the ratio of DNA and fluorescence probe, ionic strength can influence the interaction. The surfactants may interact with DNA by the competition reactions with BR for DNA-BR. The increase of ionic strength may favor the surface binding between DNA and surfactants to some extent. This work provides deep mechanistic insight on the toxicity of cationic surfactants with different head groups to DNA molecules.
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Affiliation(s)
- Qing Guo
- School of Environment, Liaoning University, Shenyang 110036, PR China
| | - Zhaohong Zhang
- School of Environment, Liaoning University, Shenyang 110036, PR China.
| | - Youtao Song
- School of Environment, Liaoning University, Shenyang 110036, PR China
| | - Shuo Liu
- Shenyang Red Cross Hospital, Shenyang 110014, PR China
| | - Wei Gao
- School of Environment, Liaoning University, Shenyang 110036, PR China
| | - Heng Qiao
- School of Environment, Liaoning University, Shenyang 110036, PR China; Pony Testing International Group, Qingdao 266100, PR China
| | - Lili Guo
- School of Environment, Liaoning University, Shenyang 110036, PR China
| | - Jun Wang
- School of Chemistry, Liaoning University, Shenyang 110036, PR China.
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27
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Pawar S, Akula M, Labala S, Venuganti VVK, Bhattacharya A, Nag A. Zinc(II) Ion Sensing in Aqueous Micellar Solution Using Modified Bipyridine-Based "Turn-On" Fluorescent Probes and its Application in Bioimaging. Chempluschem 2016; 81:1339-1348. [PMID: 31964065 DOI: 10.1002/cplu.201600382] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Revised: 09/21/2016] [Indexed: 02/02/2023]
Abstract
The bipyridine-based constructs 4-(pyridine-2-yl)-3H-pyrrolo[2,3-c]quinoline (PPQ) and [6-(3H-pyrrolo[2,3-c]quinolin-4-yl)pyridin-2-yl]methanol (PPQ-OH) and their assemblies with surfactants are evaluated as turn-on fluorescent sensors for Zn2+ ions in aqueous solution. This study strives to overcome the problem of low water solubility of the hydrophobic PPQ and PPQ-OH by using micelles. Whereas the ligands show selective sensing behavior for Zn2+ over important biological cations including Na+ , K+ , Ca2+ , Mg2+ in anionic sodium dodecyl sulfate and non-ionic Tween 80 micelles, no Zn2+ sensing is observed in cationic cetyltrimethylammonium bromide micelles. Unlike in DMF, Cd2+ interference is observed in aqueous conditions, which can be avoided either by performing the study at pH≥9 or by carrying out a time-resolved fluorescence study. Analysis of the Job plot data, the fluorescence lifetimes, and experiments on varying micellar shape and pH, confirms that the coordination volume of the resulting octahedral metal complex and formation of a five-membered chelate ring are critical factors for Cd2+ interference. The described sensing systems are capable of detecting Zn2+ ions at the micromolar level. Additionally, it is shown that PPQ and PPQ-OH can be used to detect Zn2+ in HeLa cells under physiological conditions in bioimaging studies.
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Affiliation(s)
- Shweta Pawar
- Department of Chemistry, BITS Pilani Hyderabad Campus, Hyderabad, 500078, India
| | - Mahesh Akula
- Department of Chemistry, BITS Pilani Hyderabad Campus, Hyderabad, 500078, India
| | - Suman Labala
- Department of Pharmacy, BITS Pilani Hyderabad Campus, Hyderabad, 500078, India
| | | | - Anupam Bhattacharya
- Department of Chemistry, BITS Pilani Hyderabad Campus, Hyderabad, 500078, India
| | - Amit Nag
- Department of Chemistry, BITS Pilani Hyderabad Campus, Hyderabad, 500078, India
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28
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Buchweitz M, Kroon PA, Rich GT, Wilde PJ. Quercetin solubilisation in bile salts: A comparison with sodium dodecyl sulphate. Food Chem 2016; 211:356-64. [PMID: 27283643 PMCID: PMC4911888 DOI: 10.1016/j.foodchem.2016.05.034] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 04/07/2016] [Accepted: 05/03/2016] [Indexed: 01/25/2023]
Abstract
Quercetin partitions into bile salt and SDS micelles. Quercetin’s UV–visible spectra reflect its environment and micelle formation. Quercetin’s binding site is more hydrophobic in bile salt micelles. Pyrene fluorescence confirms quercetin’s spectral data. The results contribute to understanding quercetin’s low bioavailability.
To understand the bioaccessibility of the flavonoid quercetin we studied its interaction with bile salt micelles. The environmental sensitivity of quercetin’s UV–visible absorption spectrum gave information about quercetin partitioning. Two quercetin absorption peaks gave complementary information: Peak A (240–280 nm) on the intermicellar phase and Peak B (340–440 nm) on the micellar phase. Thus, by altering pH, we showed that only non-ionised quercetin partitions into micelles. We validated our interpretation by studying quercetin’s interaction with SDS micelles. Pyrene fluorescence and the quercetin UV–visible spectra show that the adsorption site for pyrene and quercetin in bile salt micelles is more hydrophobic than that for SDS micelles. Also, both quercetin and pyrene reported a higher critical micelle concentration for bile salts than for SDS. Our method of using a flavonoid as an intrinsic probe, is generally applicable to other lipophilic bioactives, whenever they have observable environmental dependent properties.
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Affiliation(s)
- Maria Buchweitz
- Institute of Food Research, Norwich Research Park, Norwich NR4 7UA, UK.
| | - Paul A Kroon
- Institute of Food Research, Norwich Research Park, Norwich NR4 7UA, UK.
| | - Gillian T Rich
- Institute of Food Research, Norwich Research Park, Norwich NR4 7UA, UK.
| | - Peter J Wilde
- Institute of Food Research, Norwich Research Park, Norwich NR4 7UA, UK.
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29
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Sarkar P, Chattopadhyay A. Micellar dipole potential is sensitive to sphere-to-rod transition. Chem Phys Lipids 2015; 195:34-8. [PMID: 26616562 DOI: 10.1016/j.chemphyslip.2015.11.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 11/16/2015] [Accepted: 11/17/2015] [Indexed: 12/31/2022]
Abstract
Structural transitions involving shape changes play an important role in cellular physiology. Charged micelles offer a convenient model system in which structural transitions can be suitably induced by increasing the ionic strength of the medium. In this paper, we have explored sphere-to-rod transition in charged micelles of SDS and CTAB by monitoring micellar dipole potential using the dual wavelength ratiometric approach utilizing the potential-sensitive membrane probe di-8-ANEPPS. Our results show that micellar dipole potential is sensitive to sphere-to-rod transition in charged micelles. Micellar dipole potential exhibited increase with increasing ionic strength (salt), irrespective of the nature of micellar charge, implying considerable dipolar reorganization underlying structural transitions. We interpret the increase in dipole potential due to sphere-to-rod transition because of an increase in the population of confined (nonrandom) dipoles induced by micellar organizational change. This is due to the fact that dipole potential arises due to the nonrandom arrangement of micellar dipoles and water molecules at the micelle interface. Our results constitute one of the first reports describing drastic dipolar reorganization due to micellar shape (and size) change. We envision that dipole potential measurements could provide novel insights into micellar processes that are associated with dipolar reorganization.
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Affiliation(s)
- Parijat Sarkar
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
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30
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Dipolar rearrangement during micellization explored using a potential-sensitive fluorescent probe. Chem Phys Lipids 2015; 191:91-5. [PMID: 26327331 DOI: 10.1016/j.chemphyslip.2015.08.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2015] [Revised: 08/22/2015] [Accepted: 08/24/2015] [Indexed: 02/07/2023]
Abstract
Dipole potential is the potential difference within the membrane bilayer, which originates due to the nonrandom arrangement of lipid dipoles and water molecules at the membrane interface. Although dipole potential is generally used in the context of bilayer membranes, the nonrandom arrangement of amphiphiles and water dipoles would also contribute to dipole potential in organized molecular assemblies such as micelles. In this work, we show that the process of micelle formation from monomers for a representative variety of detergents is associated with dipolar rearrangement. We monitor the dipolar reorganization upon micellization as a change in dipole potential, measured by the dual wavelength ratiometric approach utilizing the potential-sensitive membrane probe di-8-ANEPPS. We further utilized this phenomenon to estimate the critical micelle concentration (CMC) of a variety of detergents. CMC determined by this method are in overall agreement with the literature values of CMC for these detergents. To the best of our knowledge, these results constitute the first report showing dipolar reorientation during micellization. We conclude that dipole potential measurements could provide a novel approach to explore micellar organization.
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31
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Sandoval C, Ortega A, Sanchez SA, Morales J, Gunther G. Structuration in the interface of direct and reversed micelles of sucrose esters, studied by fluorescent techniques. PLoS One 2015; 10:e0123669. [PMID: 25905632 PMCID: PMC4408079 DOI: 10.1371/journal.pone.0123669] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 03/06/2015] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Reactors found in nature can be described as micro-heterogeneous systems, where media involved in each micro-environment can behave in a markedly different way compared with the properties of the bulk solution. The presence of water molecules in micro-organized assemblies is of paramount importance for many chemical processes, ranging from biology to environmental science. Self-organized molecular assembled systems are frequently used to study dynamics of water molecules because are the simplest models mimicking biological membranes. The hydrogen bonds between sucrose and water molecules are described to be stronger (or more extensive) than the ones between water molecules themselves. In this work, we studied the capability of sucrose moiety, attached to alkyl chains of different length, as a surface blocking agent at the water-interface and we compared its properties with those of polyethylenglycol, a well-known agent used for this purposes. Published studies in this topic mainly refer to the micellization process and the stability of mixed surfactant systems using glycosides. We are interested in the effect induced by the presence of sucrose monoesters at the interface (direct and reverse micelles) and at the palisade (mixtures with Triton X-100). We believe that the different functional group (ester), the position of alkyl chain (6-O) and the huge capability of sucrose to interact with water will dramatically change the water structuration at the interface and at the palisade, generating new possibilities for technological applications of these systems. RESULTS Our time resolved and steady state fluorescence experiments in pure SEs micelles show that sucrose moieties are able to interact with a high number of water molecules promoting water structuration and increased viscosity. These results also indicate that the barrier formed by sucrose moieties on the surface of pure micelles is more effective than the polyoxyethylene palisade of Triton X-100. The fluorescence quenching experiments of SEs at the palisade of Triton X-100 micelles indicate a blocking effect dependent on the number of methylene units present in the hydrophobic tail of the surfactant. A remarkable blocking effect is observed when there is a match in size between the hydrophobic regions forming the apolar core (lauryl SE/ Triton X-100). This blocking effect disappears when a mismatch in size between hydrophobic tails, exists due to the disturbing effect on the micelle core.
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Affiliation(s)
- Catalina Sandoval
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Anakenna Ortega
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Susana A. Sanchez
- Departamento de Polímeros, Facultad de Química, Universidad de Concepción, Concepción, Chile
| | - Javier Morales
- Departamento de Ciencias y Tecnología Farmacéuticas, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - German Gunther
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
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32
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Hepatocellular carcinoma dually-targeted nanoparticles for reduction triggered intracellular delivery of doxorubicin. Int J Pharm 2015; 478:553-68. [DOI: 10.1016/j.ijpharm.2014.10.041] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2014] [Revised: 09/24/2014] [Accepted: 10/15/2014] [Indexed: 11/23/2022]
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33
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Ganguly A, Ghosh S, Guchhait N. Binding of a potential chloride channel blocker with an anionic surfactant and subsequent release in solution: effect of a hydrotropic solute in the post-micellar region. RSC Adv 2014. [DOI: 10.1039/c4ra10456k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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34
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The role of 2-methyl-2, 4-pentanediol in sodium dodecyl sulfate micelle dissociation unveiled by dynamic light scattering and molecular dynamics simulations. Colloids Surf B Biointerfaces 2014; 114:357-62. [DOI: 10.1016/j.colsurfb.2013.10.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 10/14/2013] [Accepted: 10/16/2013] [Indexed: 11/18/2022]
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Insights into the molecular basis of action of the AT1 antagonist losartan using a combined NMR spectroscopy and computational approach. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2013; 1838:1031-46. [PMID: 24374319 DOI: 10.1016/j.bbamem.2013.12.012] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Revised: 12/17/2013] [Accepted: 12/19/2013] [Indexed: 01/11/2023]
Abstract
The drug:membrane interactions for the antihypertensive AT1 antagonist losartan, the prototype of the sartans class, are studied herein using an integrated approach. The pharmacophore arrangement of the drug was revealed by rotating frame nuclear Overhauser effect spectroscopy (2D ROESY) NMR spectroscopy in three different environments, namely water, dimethyl sulfoxide (DMSO), and sodium dodecyl sulfate (SDS) micellar solutions mimicking conditions of biological transport fluids and membrane lipid bilayers. Drug association with micelles was monitored by diffusion ordered spectroscopy (2D DOSY) and drug:micelle intermolecular interactions were characterized by ROESY spectroscopy. The localisation of the drug in the micellar environment was investigated by introducing 5-doxyl and 16-doxyl stearic acids. The use of spin labels confirmed that losartan resides close to the micelle:water interface with the hydroxymethyl group and the tetrazole heterocyclic aromatic ring facing the polar surface with the potential to interact with SDS charged polar head groups in order to increase amphiphilic interactions. The spontaneous insertion, the diffusion pathway and the conformational features of losartan were monitored by Molecular Dynamics (MD) simulations in a modeled SDS micellar aggregate environment and a long exploratory MD run (580ns) in a phospholipid dipalmitoylphosphatidylcholine (DPPC) bilayer with the AT1 receptor embedded. MD simulations were in excellent agreement with experimental results and further revealed the molecular basis of losartan:membrane interactions in atomic-level detail. This applied integrated approach aims to explore the role of membranes in losartan's pathway towards the AT1 receptor.
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36
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Pawar MG, Srivatsan SG. Environment-responsive fluorescent nucleoside analogue probe for studying oligonucleotide dynamics in a model cell-like compartment. J Phys Chem B 2013; 117:14273-82. [PMID: 24161106 DOI: 10.1021/jp4071168] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The majority of fluorescent nucleoside analogue probes that have been used in the in vitro study of nucleic acids are not suitable for cell-based biophysical assays because they exhibit excitation maxima in the UV region and low quantum yields within oligonucleotides. Therefore, we propose that the photophysical characterization of oligonucleotides labeled with a fluorescent nucleoside analogue in reverse micelles (RM), which are good biological membrane models and UV-transparent, could provide an alternative approach to studying the properties of nucleic acids in a cell-like confined environment. In this context, we describe the photophysical properties of an environment-sensitive fluorescent uridine analogue (1), based on the 5-(benzo[b]thiophen-2-yl)pyrimidine core, in micelles and RM. The emissive nucleoside, which is polarity- and viscosity-sensitive, reports the environment of the surfactant assemblies via changes in its fluorescence properties. The nucleoside analogue, incorporated into an RNA oligonucleotide and hybridized to its complementary DNA and RNA oligonucleotides, exhibits a significantly higher fluorescence intensity, lifetime, and anisotropy in RM than in aqueous buffer, which is consistent with the environment of RM. Collectively, our results demonstrate that nucleoside 1 could be utilized as a fluorescent label to study the function of nucleic acids in a model cellular milieu.
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Affiliation(s)
- Maroti G Pawar
- Department of Chemistry, Indian Institute of Science Education and Research, Pune , Dr. Homi Bhabha Road, Pashan, Pune 411008, India
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37
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Thapa U, Ismail K. Urea effect on aggregation and adsorption of sodium dioctylsulfosuccinate in water. J Colloid Interface Sci 2013; 406:172-7. [DOI: 10.1016/j.jcis.2013.06.009] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Revised: 05/30/2013] [Accepted: 06/02/2013] [Indexed: 10/26/2022]
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38
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A Systematic Study on the Self-Assembly Behaviour of Multi Component Fmoc-Amino Acid-Poly(oxazoline) Systems. Polymers (Basel) 2012. [DOI: 10.3390/polym4031399] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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39
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Chaudhuri A, Haldar S, Chattopadhyay A. Structural transition in micelles: novel insight into microenvironmental changes in polarity and dynamics. Chem Phys Lipids 2012; 165:497-504. [DOI: 10.1016/j.chemphyslip.2011.09.007] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 09/15/2011] [Accepted: 09/16/2011] [Indexed: 01/23/2023]
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40
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Haldar S, Kanaparthi RK, Samanta A, Chattopadhyay A. Differential effect of cholesterol and its biosynthetic precursors on membrane dipole potential. Biophys J 2012; 102:1561-9. [PMID: 22500756 DOI: 10.1016/j.bpj.2012.03.004] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 02/17/2012] [Accepted: 03/02/2012] [Indexed: 01/16/2023] Open
Abstract
Dipole potential is the potential difference within the membrane bilayer, which originates due to the nonrandom arrangement of lipid dipoles and water molecules at the membrane interface. Cholesterol, a representative sterol in higher eukaryotic membranes, is known to increase membrane dipole potential. In this work, we explored the effects of immediate (7-DHC and desmosterol) and evolutionary (ergosterol) precursors of cholesterol on membrane dipole potential, monitored by the dual wavelength ratiometric approach utilizing the probe di-8-ANEPPS. Our results show that the effect of these precursors on membrane dipole potential is very different from that observed with cholesterol, although the structural differences among them are subtle. These results assume relevance, since accumulation of cholesterol precursors due to defective cholesterol biosynthesis has been reported to result in several inherited metabolic disorders such as the Smith-Lemli-Opitz syndrome. Interestingly, cholesterol (and its precursors) has a negligible effect on dipole potential in polyunsaturated membranes. We interpret these results in terms of noncanonical orientation of cholesterol in these membranes. Our results constitute the first report on the effect of biosynthetic and evolutionary precursors of cholesterol on dipole potential, and imply that a subtle change in sterol structure can significantly alter the dipolar field at the membrane interface.
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Affiliation(s)
- Sourav Haldar
- Centre for Cellular and Molecular Biology, Council of Scientific and Industrial Research, Hyderabad, India
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Domínguez H. Structural Transition of the Sodium Dodecyl Sulfate (SDS) Surfactant Induced by Changes in Surfactant Concentrations. J Phys Chem B 2011; 115:12422-8. [DOI: 10.1021/jp202813b] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hector Domínguez
- Instituto de Investigaciones en Materiales, UNAM, Universidad Nacional Autónoma de México, México, D.F. 04510
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Haldar S, Chattopadhyay K. Effects of arginine and other solution additives on the self-association of different surfactants: an investigation at single-molecule resolution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5842-5849. [PMID: 21488688 DOI: 10.1021/la200580z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Fluorescence correlation spectroscopy is used to monitor the self-association of SDS and DTAB monomers at single-molecule resolution. Tetramethylrhodamine-5-maleimide (TMR) has been chosen as a probe because rhodamine dyes have been shown to bind surfactant micelles. Correlation functions obtained by FCS experiments have been fit using conventional discrete diffusional component analysis as well as the more recent maximum entropy method (MEM). Hydrodynamic radii calculated from the diffusion time values increase with surfactant concentration as the monomers self-associate. Effects of several solution additives on the self-association property of the surfactants have been studied. Urea and glycerol inhibit self-association, and arginine shows a dual nature. With SDS, arginine favors self-association, and with DTAB, it inhibits micelle formation. We propose surfactant self-association to be a "supersimplified" model of protein aggregation.
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Affiliation(s)
- Shubhasis Haldar
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, Council of Scientific and Industrial Research, 4 Raja S. C. Mullick Road, Kolkata 700032, India
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Unique liquid crystal behavior in water of anionic fluorocarbon–hydrocarbon hybrid surfactants containing oxyethylene units. J Colloid Interface Sci 2011; 357:400-6. [DOI: 10.1016/j.jcis.2011.02.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Revised: 02/06/2011] [Accepted: 02/08/2011] [Indexed: 11/19/2022]
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Gao L, Zhao L, Huang X, Xu B, Yan Y, Huang J. A surfactant type fluorescence probe for detecting micellar growth. J Colloid Interface Sci 2011; 354:256-60. [DOI: 10.1016/j.jcis.2010.10.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2010] [Revised: 10/13/2010] [Accepted: 10/14/2010] [Indexed: 11/25/2022]
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Sadownik JW, Leckie J, Ulijn RV. Micelle to fibre biocatalytic supramolecular transformation of an aromatic peptide amphiphile. Chem Commun (Camb) 2011; 47:728-30. [DOI: 10.1039/c0cc03796f] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bhattacharya M, Jain N, Bhasne K, Kumari V, Mukhopadhyay S. pH-Induced conformational isomerization of bovine serum albumin studied by extrinsic and intrinsic protein fluorescence. J Fluoresc 2010; 21:1083-90. [PMID: 21128099 DOI: 10.1007/s10895-010-0781-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2010] [Accepted: 11/25/2010] [Indexed: 11/30/2022]
Abstract
Serum albumins are multi-domain all α-helical proteins that are present in the circulatory system and aid in the transport of a variety of metabolites, endogenous ligands, drugs etc. Earlier observations have indicated that serum albumins adopt a range of reversible conformational isomers depending on the pH of the solution. Herein, we report the concurrent changes in the protein conformation and size that are inherent to the pH-induced conformational isomers of bovine serum albumin (BSA). We have investigated the fluorescence properties of both intrinsic (tryptophan) and extrinsic (ANS, pyrene) fluorophores to shed light into the structural features of the pH-dependent conformers. We have been able to identify a number of conformational isomers using multiple fluorescence observables as a function of pH titration. Our results indicate that at pH 3, a partially-folded, 'molten-globule-like' state is populated. Moreover, equilibrium unfolding studies indicated that the 'molten-globule-like' state unfolds in a non-cooperative fashion and is thermodynamically less stable than the native state. The fluorescence-based approach described in the present work has implications in the study of pH-induced conformational plasticity of other physiologically relevant proteins.
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Affiliation(s)
- Mily Bhattacharya
- Indian Institute of Science Education and Research (IISER), Mohali, Sector 81, S.A.S Nagar, Mohali 160062 Punjab, India
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