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Dash BR, Gardas RL, Mishra AK. Probing the heterogeneity of molecular level organization of ionic liquids: a comparative study using neutral Nile red and cationic Nile blue sulfate as fluorescent probes for butyrolactam-based protic ionic liquids. Phys Chem Chem Phys 2024; 26:13350-13363. [PMID: 38639928 DOI: 10.1039/d4cp00520a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Ionic liquids (ILs) are liquid salts composed of cations and anions, known for their significant local heterogeneity at the molecular level. To understand the microheterogeneity with regard to their local polarity and local viscosity, we have used two structurally similar but chemically distinguishable fluorescent probes: Nile red (NR), a neutral molecule, and Nile blue sulfate (NBS), a charged molecule. A comparative study of the response of the two probes to the molecular level heterogeneity of ILs is expected to provide a better clarity of understanding regarding the charged polar domain and the uncharged hydrophobic domain of ILs. Towards this, we synthesized two butyrolactam-based protic ionic liquids (PILs), i.e., BTF and BTD, with the same ionic headgroup ([BT]+) and different alkyl tails ([RCOO]-), where {R = H, C11H23}. BTF has no significant hydrophobic domain, whereas BTD has a larger hydrophobic domain. Temperature-dependent fluorescence parameters such as fluorescence intensity, lifetime, and anisotropy were measured for both NR and NBS molecules. The use of a pair of structurally similar but ionically different probes enables differential estimation of parameters like the microviscosity of a domain using the fluorescence anisotropy parameter (r). The absorption and emission spectra of both probe molecules are observed to be blue shifted upon going from BTF to BTD. NR showed a significant blue shift in absorption and emission band maxima. Conversely, NBS exhibited a small wavelength shift, possibly influenced by the preferred location of their charged head group domain. Temperature-dependent rotational relaxation time (θ) of NR in BTD is smaller than that of NBS by 60-70%, indicating that stronger charge-charge interactions exist between the polar domain of BTD and NBS. Moreover, it is observed that the local viscosity of the BTF IL around both probes is similar, whereas there is a considerable difference for the BTD IL. These results are an indication that NBS being charged prefers to locate itself in the charged head group region of the IL, whereas NR being neutral tends to reside both in the hydrophobic domain and in the head group but is predominantly located in the hydrophobic domain.
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Affiliation(s)
- Bignya Rani Dash
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Ramesh L Gardas
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Ashok Kumar Mishra
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
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2
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Sadhu C, Mitra AK. Synthetic, biological and optoelectronic properties of phenoxazine and its derivatives: a state of the art review. Mol Divers 2024; 28:965-1007. [PMID: 36757655 PMCID: PMC9909160 DOI: 10.1007/s11030-023-10619-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Accepted: 01/31/2023] [Indexed: 02/10/2023]
Abstract
Phenoxazines have sparked a lot of interest owing to their numerous applications in material science, organic light-emitting diodes, photoredox catalyst, dye-sensitized solar cells and chemotherapy. Among other things, they have antioxidant, antidiabetic, antimalarial, anti-alzheimer, antiviral, anti-inflammatory and antibiotic properties. Actinomycin D, which contains a phenoxazine moiety, functions both as an antibiotic and anticancer agent. Several research groups have worked on various structural modifications over the years in order to develop new phenoxazines with improved properties. Both phenothiazines and phenoxazines have gained prominence in medicine as pharmacological lead structures from their traditional uses as dyes and pigments. Organoelectronics and material sciences have recently found these compounds and their derivatives to be quite useful. Due to this, organic synthesis has been used in an unprecedented amount of exploratory alteration of the parent structures in an effort to create novel derivatives with enhanced biological and material capabilities. As a result, it is critical to conduct more frequent reviews of the work done in this area. Various stages of the synthetic transformation of phenoxazine scaffolds have been depicted in this article. This article aims to provide a state of the art review for the better understanding of the phenoxazine derivatives highlighting the progress and prospects of the same in medicinal and material applications.
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Affiliation(s)
- Chandrita Sadhu
- Department of Chemistry, Rani Rashmoni Green University, Tarakeswar, Hooghly, West Bengal, India
| | - Amrit Krishna Mitra
- Department of Chemistry, Government General Degree College, Singur, Singur, Hooghly, West Bengal, 712409, India.
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3
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Agostini F, Sinn L, Petras D, Schipp CJ, Kubyshkin V, Berger AA, Dorrestein PC, Rappsilber J, Budisa N, Koksch B. Multiomics Analysis Provides Insight into the Laboratory Evolution of Escherichia coli toward the Metabolic Usage of Fluorinated Indoles. ACS CENTRAL SCIENCE 2021; 7:81-92. [PMID: 33532571 PMCID: PMC7844855 DOI: 10.1021/acscentsci.0c00679] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Indexed: 05/23/2023]
Abstract
Organofluorine compounds are known to be toxic to a broad variety of living beings in different habitats, and chemical fluorination has been historically exploited by mankind for the development of therapeutic drugs or agricultural pesticides. On the other hand, several studies so far have demonstrated that, under appropriate conditions, living systems (in particular bacteria) can tolerate the presence of fluorinated molecules (e.g., amino acids analogues) within their metabolism and even repurpose them as alternative building blocks for the synthesis of cellular macromolecules such as proteins. Understanding the molecular mechanism behind these phenomena would greatly advance approaches to the biotechnological synthesis of recombinant proteins and peptide drugs. However, information about the metabolic effects of long-term exposure of living cells to fluorinated amino acids remains scarce. Hereby, we report the long-term propagation of Escherichia coli (E. coli) in an artificially fluorinated habitat that yielded two strains naturally adapted to live on fluorinated amino acids. In particular, we applied selective pressure to force a tryptophan (Trp)-auxotrophic strain to use either 4- or 5-fluoroindole as essential precursors for the in situ synthesis of Trp analogues, followed by their incorporation in the cellular proteome. We found that full adaptation to both fluorinated Trp analogues requires a low number of genetic mutations but is accompanied by large rearrangements in regulatory networks, membrane integrity, and quality control of protein folding. These findings highlight the cellular mechanisms behind the adaptation to unnatural amino acids and provide the molecular foundation for bioengineering of novel microbial strains for synthetic biology and biotechnology.
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Affiliation(s)
- Federica Agostini
- Institute
of Biochemistry—Charité Universitätsmedizin Berlin, Berlin 10117, Germany
| | - Ludwig Sinn
- Institute
of Biotechnology—Bioanalytics, Technische
Universität Berlin, Berlin 10623, Germany
| | - Daniel Petras
- Skaggs School
of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, California 92093, United States
| | - Christian J. Schipp
- Institute
of Chemistry—Biocatalysis, Technische
Universität Berlin, Berlin 10623, Germany
| | - Vladimir Kubyshkin
- Institute
of Chemistry—Biocatalysis, Technische
Universität Berlin, Berlin 10623, Germany
- Department
of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Allison Ann Berger
- Institute
of Chemistry and Biochemistry—Organic Chemistry, Freie Universität Berlin, Berlin 14195, Germany
| | - Pieter C. Dorrestein
- Skaggs School
of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, California 92093, United States
| | - Juri Rappsilber
- Institute
of Biotechnology—Bioanalytics, Technische
Universität Berlin, Berlin 10623, Germany
- Wellcome
Centre for Cell Biology, University of Edinburgh, Edinburgh EH9 3BF, United Kingdom
| | - Nediljko Budisa
- Institute
of Chemistry—Biocatalysis, Technische
Universität Berlin, Berlin 10623, Germany
- Department
of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Beate Koksch
- Institute
of Chemistry and Biochemistry—Organic Chemistry, Freie Universität Berlin, Berlin 14195, Germany
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Veloso SRS, Silva JFG, Hilliou L, Moura C, Coutinho PJG, Martins JA, Testa-Anta M, Salgueiriño V, Correa-Duarte MA, Ferreira PMT, Castanheira EMS. Impact of Citrate and Lipid-Functionalized Magnetic Nanoparticles in Dehydropeptide Supramolecular Magnetogels: Properties, Design and Drug Release. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 11:E16. [PMID: 33374786 PMCID: PMC7824179 DOI: 10.3390/nano11010016] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 12/17/2020] [Accepted: 12/21/2020] [Indexed: 02/07/2023]
Abstract
Currently, the nanoparticle functionalization effect on supramolecular peptide-based hydrogels remains undescribed, but is expected to affect the hydrogels' self-assembly and final magnetic gel properties. Herein, two different functionalized nanoparticles: citrate-stabilized (14.4 ± 2.6 nm) and lipid-coated (8.9 ± 2.1 nm) magnetic nanoparticles, were used for the formation of dehydropeptide-based supramolecular magnetogels consisting of the ultra-short hydrogelator Cbz-L-Met-Z-ΔPhe-OH, with an assessment of their effect over gel properties. The lipid-coated nanoparticles were distributed along the hydrogel fibers, while citrate-stabilized nanoparticles were aggregated upon gelation, which resulted into a heating efficiency improvement and decrease, respectively. Further, the lipid-coated nanoparticles did not affect drug encapsulation and displayed improved drug release reproducibility compared to citrate-stabilized nanoparticles, despite the latter attaining a stronger AMF-trigger. This report points out that adsorption of nanoparticles to hydrogel fibers, which display domains that improve or do not affect drug encapsulation, can be explored as a means to optimize the development of supramolecular magnetogels to advance theranostic applications.
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Affiliation(s)
- Sérgio R. S. Veloso
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (J.F.G.S.); (C.M.); (P.J.G.C.)
| | - Joana F. G. Silva
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (J.F.G.S.); (C.M.); (P.J.G.C.)
| | - Loic Hilliou
- Institute for Polymers and Composites, Department of Polymer Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal;
| | - Cacilda Moura
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (J.F.G.S.); (C.M.); (P.J.G.C.)
| | - Paulo J. G. Coutinho
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (J.F.G.S.); (C.M.); (P.J.G.C.)
| | - José A. Martins
- Centro de Química (CQUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (J.A.M.); (P.M.T.F.)
| | - Martín Testa-Anta
- Departamento de Física Aplicada, Universidade de Vigo, 36310 Vigo, Spain; (M.T.-A.); (V.S.)
- CINBIO, Universidade de Vigo, 36310 Vigo, Spain;
| | - Verónica Salgueiriño
- Departamento de Física Aplicada, Universidade de Vigo, 36310 Vigo, Spain; (M.T.-A.); (V.S.)
- CINBIO, Universidade de Vigo, 36310 Vigo, Spain;
| | | | - Paula M. T. Ferreira
- Centro de Química (CQUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (J.A.M.); (P.M.T.F.)
| | - Elisabete M. S. Castanheira
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (J.F.G.S.); (C.M.); (P.J.G.C.)
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5
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Veloso SRS, Andrade RGD, Ribeiro BC, Fernandes AVF, Rodrigues ARO, Martins JA, Ferreira PMT, Coutinho PJG, Castanheira EMS. Magnetoliposomes Incorporated in Peptide-Based Hydrogels: Towards Development of Magnetolipogels. NANOMATERIALS (BASEL, SWITZERLAND) 2020; 10:E1702. [PMID: 32872453 PMCID: PMC7558371 DOI: 10.3390/nano10091702] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 08/23/2020] [Accepted: 08/27/2020] [Indexed: 12/02/2022]
Abstract
A major problem with magnetogels is the encapsulation of hydrophobic drugs. Magnetoliposomes not only provide these domains but also improve drug stability and avert the aggregation of the magnetic nanoparticles. In this work, two magnetoliposome architectures, solid and aqueous, were combined with supramolecular peptide-based hydrogels, which are of biomedical interest owing to their biocompatibility, easy tunability, and wide array of applications. This proof-of-concept was carried out through combination of magnetoliposomes (loaded with the model drug curcumin and the lipid probe Nile Red) with the hydrogels prior to pH triggered gelation, and fluorescence spectroscopy was used to assess the dynamics of the encapsulated molecules. These systems allow for the encapsulation of a wider array of drugs. Further, the local environment of the encapsulated molecules after gelation is unaffected by the used magnetoliposome architecture. This system design is promising for future developments on drug delivery as it provides a means to independently modify the components and adapt and optimize the design according to the required conditions.
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Affiliation(s)
- Sérgio R. S. Veloso
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (R.G.D.A.); (B.C.R.); (A.V.F.F.); (A.R.O.R.); (P.J.G.C.)
| | - Raquel G. D. Andrade
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (R.G.D.A.); (B.C.R.); (A.V.F.F.); (A.R.O.R.); (P.J.G.C.)
| | - Beatriz C. Ribeiro
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (R.G.D.A.); (B.C.R.); (A.V.F.F.); (A.R.O.R.); (P.J.G.C.)
| | - André V. F. Fernandes
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (R.G.D.A.); (B.C.R.); (A.V.F.F.); (A.R.O.R.); (P.J.G.C.)
| | - A. Rita O. Rodrigues
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (R.G.D.A.); (B.C.R.); (A.V.F.F.); (A.R.O.R.); (P.J.G.C.)
| | - J. A. Martins
- Centre of Chemistry (CQUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (J.A.M.); (P.M.T.F.)
| | - Paula M. T. Ferreira
- Centre of Chemistry (CQUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (J.A.M.); (P.M.T.F.)
| | - Paulo J. G. Coutinho
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (R.G.D.A.); (B.C.R.); (A.V.F.F.); (A.R.O.R.); (P.J.G.C.)
| | - Elisabete M. S. Castanheira
- Centre of Physics (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal; (S.R.S.V.); (R.G.D.A.); (B.C.R.); (A.V.F.F.); (A.R.O.R.); (P.J.G.C.)
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6
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Shrivastava S, Paila YD, Kombrabail M, Krishnamoorthy G, Chattopadhyay A. Role of Cholesterol and Its Immediate Biosynthetic Precursors in Membrane Dynamics and Heterogeneity: Implications for Health and Disease. J Phys Chem B 2020; 124:6312-6320. [DOI: 10.1021/acs.jpcb.0c04338] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Sandeep Shrivastava
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
| | - Yamuna Devi Paila
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
| | - Mamata Kombrabail
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
| | - G. Krishnamoorthy
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400 005, India
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7
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Veloso SRS, Martins JA, Hilliou L, O Amorim C, Amaral VS, Almeida BG, Jervis PJ, Moreira R, Pereira DM, Coutinho PJG, Ferreira PMT, Castanheira EMS. Dehydropeptide-based plasmonic magnetogels: a supramolecular composite nanosystem for multimodal cancer therapy. J Mater Chem B 2019; 8:45-64. [PMID: 31764934 DOI: 10.1039/c9tb01900f] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Supramolecular hydrogels are highly promising candidates as biomedical materials owing to their wide array of properties, which can be tailored and modulated. Additionally, their combination with plasmonic/magnetic nanoparticles to form plasmonic magnetogels further improves their potential in biomedical applications through the combination of complementary strategies, such as photothermia, magnetic hyperthermia, photodynamic therapy and magnetic-guided drug delivery. Here, a new dehydropeptide hydrogelator, Npx-l-Met-Z-ΔPhe-OH, was developed and combined with two different plasmonic/magnetic nanoparticle architectures, i.e., core/shell manganese ferrite/gold nanoparticles and gold-decorated manganese ferrite nanoparticles with ca. 55 nm and 45 nm sizes, respectively. The magnetogels were characterized via HR-TEM, FTIR spectroscopy, circular dichroism and rheological assays. The gels were tested as nanocarriers for a model antitumor drug, the natural compound curcumin. The incorporation of the drug in the magnetogel matrices was confirmed through fluorescence-based techniques (FRET, fluorescence anisotropy and quenching). The curcumin release profiles were studied with and without the excitation of the gold plasmon band. The transport of curcumin from the magnetogels towards biomembrane models (small unilamellar vesicles) was assessed via FRET between the fluorescent drug and the lipid probe Nile Red. The developed magnetogels showed promising results for photothermia and photo-triggered drug release. The magnetogels bearing gold-decorated nanoparticles showed the best photothermia properties, while the ones containing core/shell nanoparticles had the best photoinduced curcumin release.
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Affiliation(s)
- Sérgio R S Veloso
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - J A Martins
- Centro de Química (CQUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Loic Hilliou
- Institute for Polymers and Composites/I3N, Department of Polymer Engineering, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal
| | - C O Amorim
- Physics Department and CICECO, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
| | - V S Amaral
- Physics Department and CICECO, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
| | - B G Almeida
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - Peter J Jervis
- Centro de Química (CQUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal and REQUIMTE/LAQV, Lab of Pharmacognosy, Department of Chemistry, Faculty of Pharmacy, University of Porto, R. Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - Rute Moreira
- REQUIMTE/LAQV, Lab of Pharmacognosy, Department of Chemistry, Faculty of Pharmacy, University of Porto, R. Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - David M Pereira
- REQUIMTE/LAQV, Lab of Pharmacognosy, Department of Chemistry, Faculty of Pharmacy, University of Porto, R. Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal
| | - Paulo J G Coutinho
- Centro de Física (CFUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - Paula M T Ferreira
- Centro de Química (CQUM), University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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Proton leakage across lipid bilayers: Oxygen atoms of phospholipid ester linkers align water molecules into transmembrane water wires. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2019; 1860:439-451. [PMID: 30904457 DOI: 10.1016/j.bbabio.2019.03.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 02/20/2019] [Accepted: 03/10/2019] [Indexed: 12/31/2022]
Abstract
Up to half of the cellular energy gets lost owing to membrane proton leakage. The permeability of lipid bilayers to protons is by several orders of magnitude higher than to other cations, which implies efficient proton-specific passages. The nature of these passages remains obscure. By combining experimental measurements of proton flow across phosphatidylcholine vesicles, steered molecular dynamics (MD) simulations of phosphatidylcholine bilayers and kinetic modelling, we have analyzed whether protons could pass between opposite phospholipid molecules when they sporadically converge. The MD simulations showed that each time, when the phosphorus atoms of the two phosphatidylcholine molecules got closer than 1.6 nm, the eight oxygen atoms of their ester linkages could form a transmembrane 'oxygen passage' along which several water molecules aligned into a water wire. Proton permeability along such water wires would be limited by rearrangement of oxygen atoms, which could explain the experimentally shown independence of the proton permeability of pH, H2O/D2O substitution, and membrane dipole potential. We suggest that protons can cross lipid bilayers by moving along short, self-sustaining water wires supported by oxygen atoms of lipid ester linkages.
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Veloso SRS, Magalhães CAB, Rodrigues ARO, Vilaça H, Queiroz MJRP, Martins JA, Coutinho PJG, Ferreira PMT, Castanheira EMS. Novel dehydropeptide-based magnetogels containing manganese ferrite nanoparticles as antitumor drug nanocarriers. Phys Chem Chem Phys 2019; 21:10377-10390. [DOI: 10.1039/c9cp00352e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Novel peptide-based magnetogels, containing MnFe2O4 nanoparticles of 20 nm size, were developed and successfully tested as nanocarriers for antitumor drugs.
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Affiliation(s)
| | | | | | - H. Vilaça
- Centro de Química (CQ-UM)
- Universidade do Minho
- 4710-057 Braga
- Portugal
| | | | - J. A. Martins
- Centro de Química (CQ-UM)
- Universidade do Minho
- 4710-057 Braga
- Portugal
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10
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Cardoso BD, Rio ISR, Rodrigues ARO, Fernandes FCT, Almeida BG, Pires A, Pereira AM, Araújo JP, Castanheira EMS, Coutinho PJG. Magnetoliposomes containing magnesium ferrite nanoparticles as nanocarriers for the model drug curcumin. ROYAL SOCIETY OPEN SCIENCE 2018; 5:181017. [PMID: 30473847 PMCID: PMC6227978 DOI: 10.1098/rsos.181017] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Accepted: 09/13/2018] [Indexed: 05/24/2023]
Abstract
Magnesium ferrite nanoparticles, with diameters around 25 nm, were synthesized by coprecipitation method. The magnetic properties indicate a superparamagnetic behaviour, with a maximum magnetization of 16.2 emu g-1, a coercive field of 22.1 Oe and a blocking temperature of 183.2 K. These MgFe2O4 nanoparticles were used to produce aqueous and solid magnetoliposomes, with sizes below 130 nm. The potential drug curcumin was successfully incorporated in these nanosystems, with high encapsulation efficiencies (above 89%). Interaction by fusion between both types of drug-loaded magnetoliposomes (with or without PEGylation) and models of biological membranes was demonstrated, using FRET or fluorescence quenching assays. These results point to future applications of magnetoliposomes containing MgFe2O4 nanoparticles in cancer therapy, allowing combined magnetic hyperthermia and chemotherapy.
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Affiliation(s)
- Beatriz D. Cardoso
- Centro de Física (CFUM), Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Irina S. R. Rio
- Centro de Física (CFUM), Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Ana Rita O. Rodrigues
- Centro de Física (CFUM), Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | | | - B. G. Almeida
- Centro de Física (CFUM), Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - A. Pires
- IFIMUP/IN - Instituto de Nanociência e Nanotecnologia, R. Campo Alegre, 4169-007 Porto, Portugal
| | - A. M. Pereira
- IFIMUP/IN - Instituto de Nanociência e Nanotecnologia, R. Campo Alegre, 4169-007 Porto, Portugal
| | - J. P. Araújo
- IFIMUP/IN - Instituto de Nanociência e Nanotecnologia, R. Campo Alegre, 4169-007 Porto, Portugal
| | | | - Paulo J. G. Coutinho
- Centro de Física (CFUM), Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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Wang J, Guo X, Li L, Qiu H, Zhang Z, Wang Y, Sun G. Application of the Fluorescent Dye BODIPY in the Study of Lipid Dynamics of the Rice Blast Fungus Magnaporthe oryzae. Molecules 2018; 23:E1594. [PMID: 29966327 PMCID: PMC6099410 DOI: 10.3390/molecules23071594] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2018] [Revised: 06/23/2018] [Accepted: 06/29/2018] [Indexed: 11/29/2022] Open
Abstract
Rice blast is one of the most serious diseases affecting rice yield which is caused by Magnaporthe oryzae, a model organism for studies on plant pathogenic fungi. Lipids stored in M. oryzae cells have been shown to be crucial for the development of appressorium turgor and the ability of the pathogen to cause infection. Nile red staining is a common method to study lipid dynamics in phytopathogenic fungi. However, the disadvantages of this dye include its wide spectrum, poor water solubility, and susceptibility to quenching. Boron dipyrromethene (BODIPY) is a new type of fluorescent dye that has a different emission wavelength to that of Nile red as well as many desirable spectral and chemical properties. In this study, we used BODIPY to stain the lipids in M. oryzae cells to seek a possible substitute to Nile red in the study of lipid dynamics in plant pathogenic fungi. Our data showed that through simple and routine procedures, BODIPY was able to distinctly label lipids in the cells of mycelia and conidia. The positions of lipids labeled by BODIPY were essentially identical to those labeled by Nile red, but with more clear fluorescence labelling, lower background, and higher specificity. The use of BODIPY to stain germinating M. oryzae conidia allowed the lipid dynamics to be clearly tracked during this process. We also achieved double and multiple fluorescent staining conidia by combining BODIPY with the red fluorescent protein mCherry and other fluorescent dyes, such as Calcofluor white and DAPI, in conidia, mycelia, and sexual structures of M. oryzae. These results indicate that BODIPY is an ideal fluorescent dye for staining fungal lipids and provide a method for the study of the lipid dynamics and lipid metabolism in plant pathogenic fungi.
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Affiliation(s)
- Jiaoyu Wang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
| | - Xiaoyu Guo
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
- College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Ling Li
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
- The Key Laboratory for Quality Improvement of Agricultural Products of Zhejiang Province, School of Agricultural and Food Sciences, Zhejiang Agriculture and Forest University, Hangzhou 311300, China.
| | - Haiping Qiu
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
| | - Zhen Zhang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
| | - Yanli Wang
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
| | - Guochang Sun
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Institute of Plant Protection and Microbiology, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
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12
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Sameni S, Malacrida L, Tan Z, Digman MA. Alteration in Fluidity of Cell Plasma Membrane in Huntington Disease Revealed by Spectral Phasor Analysis. Sci Rep 2018; 8:734. [PMID: 29335600 PMCID: PMC5768877 DOI: 10.1038/s41598-018-19160-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Accepted: 12/22/2017] [Indexed: 12/18/2022] Open
Abstract
Huntington disease (HD) is a late-onset genetic neurodegenerative disorder caused by expansion of cytosine-adenine-guanine (CAG) trinucleotide in the exon 1 of the gene encoding the polyglutamine (polyQ). It has been shown that protein degradation and lipid metabolism is altered in HD. In many neurodegenerative disorders, impaired lipid homeostasis is one of the early events in the disease onset. Yet, little is known about how mutant huntingtin may affect phospholipids membrane fluidity. Here, we investigated how membrane fluidity in the living cells (differentiated PC12 and HEK293 cell lines) are affected using a hyperspectral imaging of widely used probes, LAURDAN. Using phasor approach, we characterized the fluorescence of LAURDAN that is sensitive to the polarity of the immediate environment. LAURDAN is affected by the physical order of phospholipids (lipid order) and reports the membrane fluidity. We also validated our results using a different fluorescent membrane probe, Nile Red (NR). The plasma membrane in the cells expressing expanded polyQ shows a shift toward increased membrane fluidity revealed by both LAURDAN and NR spectral phasors. This finding brings a new perspective in the understanding of the early stages of HD that can be used as a target for drug screening.
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Affiliation(s)
- Sara Sameni
- Laboratory for Fluorescence Dynamics, University of California Irvine, Irvine, CA, USA
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
| | - Leonel Malacrida
- Laboratory for Fluorescence Dynamics, University of California Irvine, Irvine, CA, USA
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
- Departamento de Fisiopatología, Hospital de Clinicas, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Zhiqun Tan
- Institute for Memory Impairments and Neurological Disorders, University of California Irvine, Irvine, USA
| | - Michelle A Digman
- Laboratory for Fluorescence Dynamics, University of California Irvine, Irvine, CA, USA.
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA.
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13
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Rodrigues ARO, Mendes PM, Silva PM, Machado V, Almeida BG, Araújo J, Queiroz MJR, Castanheira EM, Coutinho PJ. Solid and aqueous magnetoliposomes as nanocarriers for a new potential drug active against breast cancer. Colloids Surf B Biointerfaces 2017; 158:460-468. [DOI: 10.1016/j.colsurfb.2017.07.015] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/09/2017] [Accepted: 07/05/2017] [Indexed: 01/08/2023]
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14
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Delpuech JJ, Dupont-Leclercq L, Parant S, Henry B. NMR Evidence for Grotthuss-like Proton Diffusion on the Surface of N-Alkyl-ammonium Micelles in Acidic Aqueous Solution. J SOLUTION CHEM 2017. [DOI: 10.1007/s10953-017-0672-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Chakraborty H, Lentz BR, Kombrabail M, Krishnamoorthy G, Chattopadhyay A. Depth-Dependent Membrane Ordering by Hemagglutinin Fusion Peptide Promotes Fusion. J Phys Chem B 2017; 121:1640-1648. [DOI: 10.1021/acs.jpcb.7b00684] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hirak Chakraborty
- CSIR-Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
- School
of Chemistry, Sambalpur University, Jyoti Vihar, Burla, Odisha 768 019, India
| | - Barry R. Lentz
- Department
of Biochemistry and Biophysics and Program in Molecular and Cellular
Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States
| | - Mamata Kombrabail
- Department
of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhaba Road, Mumbai, India
| | - G. Krishnamoorthy
- Department
of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhaba Road, Mumbai, India
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16
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Schroeder TBH, Leriche G, Koyanagi T, Johnson MA, Haengel KN, Eggenberger OM, Wang CL, Kim YH, Diraviyam K, Sept D, Yang J, Mayer M. Effects of Lipid Tethering in Extremophile-Inspired Membranes on H(+)/OH(-) Flux at Room Temperature. Biophys J 2016; 110:2430-2440. [PMID: 27276261 PMCID: PMC4906265 DOI: 10.1016/j.bpj.2016.04.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Revised: 04/08/2016] [Accepted: 04/12/2016] [Indexed: 01/22/2023] Open
Abstract
This work explores the proton/hydroxide permeability (PH+/OH-) of membranes that were made of synthetic extremophile-inspired phospholipids with systematically varied structural elements. A fluorescence-based permeability assay was optimized to determine the effects on the PH+/OH- through liposome membranes with variations in the following lipid attributes: transmembrane tethering, tether length, and the presence of isoprenoid methyl groups on one or both lipid tails. All permeability assays were performed in the presence of a low concentration of valinomycin (10 nM) to prevent buildup of a membrane potential without artificially increasing the measured PH+/OH-. Surprisingly, the presence of a transmembrane tether did not impact PH+/OH- at room temperature. Among tethered lipid monolayers, PH+/OH- increased with increasing tether length if the number of carbons in the untethered acyl tail was constant. Untethered lipids with two isoprenoid methyl tails led to lower PH+/OH- values than lipids with only one or no isoprenoid tails. Molecular dynamics simulations revealed a strong positive correlation between the probability of observing water molecules in the hydrophobic core of these lipid membranes and their proton permeability. We propose that water penetration as revealed by molecular dynamics may provide a general strategy for predicting proton permeability through various lipid membranes without the need for experimentation.
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Affiliation(s)
- Thomas B H Schroeder
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan; Adolphe Merkle Institute, University of Fribourg, Fribourg, Switzerland
| | - Geoffray Leriche
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California
| | - Takaoki Koyanagi
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California
| | - Mitchell A Johnson
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan
| | - Kathryn N Haengel
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan
| | - Olivia M Eggenberger
- Adolphe Merkle Institute, University of Fribourg, Fribourg, Switzerland; Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan
| | - Claire L Wang
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan
| | - Young Hun Kim
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California
| | - Karthik Diraviyam
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan
| | - David Sept
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California
| | - Michael Mayer
- Adolphe Merkle Institute, University of Fribourg, Fribourg, Switzerland; Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan.
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17
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Morschett H, Wiechert W, Oldiges M. Automation of a Nile red staining assay enables high throughput quantification of microalgal lipid production. Microb Cell Fact 2016; 15:34. [PMID: 26861538 PMCID: PMC4748563 DOI: 10.1186/s12934-016-0433-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 01/26/2016] [Indexed: 11/10/2022] Open
Abstract
Background Within the context of microalgal lipid production for biofuels and bulk chemical applications, specialized higher throughput devices for small scale parallelized cultivation are expected to boost the time efficiency of phototrophic bioprocess development. However, the increasing number of possible experiments is directly coupled to the demand for lipid quantification protocols that enable reliably measuring large sets of samples within short time and that can deal with the reduced sample volume typically generated at screening scale. To meet these demands, a dye based assay was established using a liquid handling robot to provide reproducible high throughput quantification of lipids with minimized hands-on-time. Results Lipid production was monitored using the fluorescent dye Nile red with dimethyl sulfoxide as solvent facilitating dye permeation. The staining kinetics of cells at different concentrations and physiological states were investigated to successfully down-scale the assay to 96 well microtiter plates. Gravimetric calibration against a well-established extractive protocol enabled absolute quantification of intracellular lipids improving precision from ±8 to ±2 % on average. Implementation into an automated liquid handling platform allows for measuring up to 48 samples within 6.5 h, reducing hands-on-time to a third compared to manual operation. Moreover, it was shown that automation enhances accuracy and precision compared to manual preparation. It was revealed that established protocols relying on optical density or cell number for biomass adjustion prior to staining may suffer from errors due to significant changes of the cells’ optical and physiological properties during cultivation. Alternatively, the biovolume was used as a measure for biomass concentration so that errors from morphological changes can be excluded. Conclusions The newly established assay proved to be applicable for absolute quantification of algal lipids avoiding limitations of currently established protocols, namely biomass adjustment and limited throughput. Automation was shown to improve data reliability, as well as experimental throughput simultaneously minimizing the needed hands-on-time to a third. Thereby, the presented protocol meets the demands for the analysis of samples generated by the upcoming generation of devices for higher throughput phototrophic cultivation and thereby contributes to boosting the time efficiency for setting up algae lipid production processes. Electronic supplementary material The online version of this article (doi:10.1186/s12934-016-0433-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Holger Morschett
- Forschungszentrum Jülich GmbH, Institute of Bio- and Geosciences, IBG-1: Biotechnology, Wilhelm-Johnen-Straße, 52428, Jülich, Germany.
| | - Wolfgang Wiechert
- Forschungszentrum Jülich GmbH, Institute of Bio- and Geosciences, IBG-1: Biotechnology, Wilhelm-Johnen-Straße, 52428, Jülich, Germany.
| | - Marco Oldiges
- Forschungszentrum Jülich GmbH, Institute of Bio- and Geosciences, IBG-1: Biotechnology, Wilhelm-Johnen-Straße, 52428, Jülich, Germany.
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18
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Rodrigues ARO, Ramos JMF, Gomes IT, Almeida BG, Araújo JP, Queiroz MJRP, Coutinho PJG, Castanheira EMS. Magnetoliposomes based on manganese ferrite nanoparticles as nanocarriers for antitumor drugs. RSC Adv 2016. [DOI: 10.1039/c5ra27058h] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aqueous and solid magnetoliposomes containing MnFe2O4 nanoparticles were prepared and evaluated as nanocarriers for a new antitumor drug.
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Affiliation(s)
| | - José M. F. Ramos
- Centro de Física (CFUM)
- Universidade do Minho
- Campus de Gualtar
- 4710-057 Braga
- Portugal
| | - I. T. Gomes
- Centro de Física (CFUM)
- Universidade do Minho
- Campus de Gualtar
- 4710-057 Braga
- Portugal
| | - Bernardo G. Almeida
- Centro de Física (CFUM)
- Universidade do Minho
- Campus de Gualtar
- 4710-057 Braga
- Portugal
| | - J. P. Araújo
- IFIMUP/IN-Instituto de Nanociência e Nanotecnologia
- 4169-007 Porto
- Portugal
| | | | - Paulo J. G. Coutinho
- Centro de Física (CFUM)
- Universidade do Minho
- Campus de Gualtar
- 4710-057 Braga
- Portugal
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19
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Kundu P, Ghosh S, Jana B, Chattopadhyay N. Binding interaction of differently charged fluorescent probes with egg yolk phosphatidylcholine and the effect of β-cyclodextrin on the lipid-probe complexes: a fluorometric investigation. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 142:15-24. [PMID: 25698439 DOI: 10.1016/j.saa.2015.01.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 01/20/2015] [Indexed: 06/04/2023]
Abstract
Interaction of cationic phenosafranin (PSF), anionic 8-anilino-1-naphthalene sulfonate (ANS) and non-ionic nile red (NR) have been studied with the zwitterionic phospholipid, egg yolk L-α-phosphatidylcholine (EYPC). The study reveals discernible binding interactions of the three fluorescent probes with the EYPC lipid vesicle. Once the binding of the probes with the lipid is established, the effect of cyclic oligosaccharide, β-cyclodextrin (β-CD), on these lipid bound probes has been investigated. Different fluorometric techniques suggest that addition of β-CD to the probe-lipid complexes leads to the release of the probes from the lipid medium through the formation of probe-β-CD inclusion complexes. A competitive binding of the probes between β-cyclodextrin and the lipid is ascribed to be responsible for the effect. This provides an easy avenue for the removal of the probe molecules from the lipid environment. Extension of this work with drug molecules in cell membranes is expected to give rise to a strategy for the removal of adsorbed drugs from the cell membranes by the use of non-toxic β-cyclodextrin.
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Affiliation(s)
- Pronab Kundu
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
| | - Saptarshi Ghosh
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
| | - Barnali Jana
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
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20
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Rumin J, Bonnefond H, Saint-Jean B, Rouxel C, Sciandra A, Bernard O, Cadoret JP, Bougaran G. The use of fluorescent Nile red and BODIPY for lipid measurement in microalgae. BIOTECHNOLOGY FOR BIOFUELS 2015; 8:42. [PMID: 25788982 PMCID: PMC4364489 DOI: 10.1186/s13068-015-0220-4] [Citation(s) in RCA: 208] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Accepted: 02/04/2015] [Indexed: 05/02/2023]
Abstract
Microalgae are currently emerging as one of the most promising alternative sources for the next generation of food, feed, cosmetics and renewable energy in the form of biofuel. Microalgae constitute a diverse group of microorganisms with advantages like fast and efficient growth. In addition, they do not compete for arable land and offer very high lipid yield potential. Major challenges for the development of this resource are to select lipid-rich strains using high-throughput staining for neutral lipid content in microalgae species. For this purpose, the fluorescent dyes most commonly used to quantify lipids are Nile red and BODIPY 505/515. Their fluorescent staining for lipids offers a rapid and inexpensive analysis tool to measure neutral lipid content, avoiding time-consuming and costly gravimetric analysis. This review collates and presents recent advances in algal lipid staining and focuses on Nile red and BODIPY 505/515 staining characteristics. The available literature addresses the limitations of fluorescent dyes under certain conditions, such as spectral properties, dye concentrations, cell concentrations, temperature and incubation duration. Moreover, the overall conclusion of the present review study gives limitations on the use of fluorochrome for screening of lipid-rich microalgae species and suggests improved protocols for staining recalcitrant microalgae and recommendations for the staining quantification.
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21
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Rodrigues ARO, Gomes IT, Almeida BG, Araújo JP, Castanheira EMS, Coutinho PJG. Magnetic liposomes based on nickel ferrite nanoparticles for biomedical applications. Phys Chem Chem Phys 2015; 17:18011-21. [DOI: 10.1039/c5cp01894c] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aqueous and dry magnetoliposomes containing NiFe2O4 nanoparticles were prepared using a new method and fusion with model membranes was demonstrated.
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Affiliation(s)
| | - I. T. Gomes
- Centro de Física
- Universidade do Minho (CFUM)
- 4710-057 Braga
- Portugal
- IFIMUP/IN – Instituto de Nanociência e Nanotecnologia
| | | | - J. P. Araújo
- IFIMUP/IN – Instituto de Nanociência e Nanotecnologia
- 4169-007 Porto
- Portugal
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22
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Ghosh S, Chattoraj S, Chattopadhyay N. Interaction of β-cyclodextrin with nile red in a single live CHO cell: an initiative towards developing a prospective strategy for the excretion of adsorbed drugs from the cell membrane. Analyst 2014; 139:5664-8. [DOI: 10.1039/c4an01114g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Steady state and time-resolved confocal microscopic studies in a single live Chinese Hamster Ovary (CHO) cell suggest that the biological staining dye nile red (NR) adsorbed on the cell membrane can be simply excreted using β-cyclodextrin.
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Affiliation(s)
- Saptarshi Ghosh
- Department of Chemistry
- Jadavpur University
- Kolkata-700 032, India
| | - Shyamtanu Chattoraj
- Department of Physical Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700 032, India
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23
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Jana B, Ghosh S, Chattopadhyay N. Competitive binding of nile red between lipids and β-cyclodextrin. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2013; 126:1-10. [PMID: 23871993 DOI: 10.1016/j.jphotobiol.2013.06.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 06/10/2013] [Accepted: 06/11/2013] [Indexed: 11/30/2022]
Abstract
Fluorometric measurements are exploited to explore the binding interactions of nile red (NR) with anionic lipid dimyristoyl-L-α-phosphatidylglycerol (DMPG), zwitterionic lipid dimyristoyl-L-α-phosphatidylcholine (DMPC) as well as neutral cyclic oligosaccharide β-cyclodextrin (β-CD) solutions. The binding constants are found to be quite high and comparable (within a factor of five). Series of spectral techniques like steady state fluorescence and fluorescence anisotropy study, micropolarity study, quenching study and time resolved experiments reveal that the addition of β-CD to the probe-lipid complexes results in weakening of the lipid-probe interaction and formation of probe-β-CD inclusion complexes leading to the removal of some of the probe (NR) molecules from the lipid environments. The extent of removal of NR is, however, more from DMPG than DMPC lipid. The phenomena are explained from the concept of competitive binding of the probe between the lipids and β-CD. Since lipids are the principal constituents of the cell walls, the work might make a foundation for the possible removal of excess of molecules like nile red adsorbed on the cell walls.
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Affiliation(s)
- Barnali Jana
- Department of Chemistry, Jadavpur University, Kolkata 700 032, India
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24
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Kumar SKK, Tamimi A, Fayer MD. Dynamics in the interior of AOT lamellae investigated with two-dimensional infrared spectroscopy. J Am Chem Soc 2013; 135:5118-26. [PMID: 23465101 DOI: 10.1021/ja312676e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The dynamics inside the organic regions of aerosol-OT (AOT)/water mixtures in the lamellar mesophase, bicontinuous cubic (BC) phase, and in an analogous molecule without the charged sulfonate headgroup are investigated by observing spectral diffusion, orientational relaxation and population relaxation using ultrafast two-dimensional infrared (2D IR) vibrational echo spectroscopy and IR pump-probe experiments on the asymmetric CO stretch of a vibrational probe, tungsten hexacarbonyl (W(CO)6). The water layer thickness between the bilayer planes in the lamellar phase was varied. For comparison, the dynamics of W(CO)6 in the normal liquid bis(2-ethylhexyl) succinate (EHS), which is analogous to AOT but has no charged sulfonate headgroup, were also studied. The 2D IR experiments measure spectral diffusion, which results from the structural evolution of the system. Spectral diffusion is quantified by the frequency-frequency correlation function (FFCF). In addition to a homogeneous component, the FFCFs are biexponential decays with fast and slow time components of ∼12.5 and ∼150 ps in the lamellar phase. Both components of the FFCF are independent of the number of water molecules per headgroup for the lamellae, but they slow somewhat in the BC phase. The dynamics in the ordered phases are in sharp contrast to the dynamics in EHS, which displays fast and slow components of the FFCF of 5 and 80 ps, respectively. As the hydration level of AOT increases, vibrational lifetime decreases, suggesting some change in the local environment of W(CO)6 with water content.
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Affiliation(s)
- S K Karthick Kumar
- Department of Chemistry, Stanford University , Stanford, California 94305, United States
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25
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Carbajal G, Cui ZK, Lafleur M. Non-phospholipid liposomes with high sterol content display a very limited permeability. Sci China Chem 2012. [DOI: 10.1007/s11426-012-4775-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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26
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Light induced transmembrane proton gradient in artificial lipid vesicles reconstituted with photosynthetic reaction centers. J Bioenerg Biomembr 2012; 44:373-84. [DOI: 10.1007/s10863-012-9435-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2011] [Accepted: 03/19/2012] [Indexed: 10/28/2022]
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27
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Kausik R, Han S. Dynamics and state of lipid bilayer-internal water unraveled with solution state 1H dynamic nuclear polarization. Phys Chem Chem Phys 2011; 13:7732-46. [DOI: 10.1039/c0cp02512g] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Chemistry and Function of Phospholipids. FOOD SCIENCE AND TECHNOLOGY 2010. [DOI: 10.1201/9781420046649.ch2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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29
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Coutinho PJ. Photophysics and Biophysical Applications of Benzo[a]phenoxazine Type Fluorophores. REVIEWS IN FLUORESCENCE 2009. [DOI: 10.1007/978-0-387-88722-7_14] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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30
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Kyrychenko A, Waluk J. Distribution and favorable binding sites of pyrroloquinoline and its analogues in a lipid bilayer studied by molecular dynamics simulations. Biophys Chem 2008; 136:128-35. [PMID: 18556112 DOI: 10.1016/j.bpc.2008.05.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2008] [Revised: 05/22/2008] [Accepted: 05/22/2008] [Indexed: 11/17/2022]
Abstract
The distribution of 1H-pyrrolo[3,2-h]quinoline (PQ), 11H-dipyrido[2,3-a]carbazole (PC) and 7-azaindole (7AI) at a water/membrane interface has been investigated by molecular dynamics (MD) simulations. The MD study focused on favorable binding sites of the azaaromatic probes across a dipalmitoylphosphatidylcholine (DPPC) bilayer. Our simulations show that PQ and PC are preferably accommodated at the hydrocarbon core of the bilayer below the glycerol moiety. In addition, it is found that the hydrophobic aromatic parts of the probes are located inside a more ordered region of DPPC, consisting of hydrophobic lipid chains. In contrast to PQ and PC, 7AI is characterized by a broad distribution between a DPPC interface and water, so that the three preferable binding sites are found across a water/membrane interface. It is found that in the sequence 7AI-PQ-PC, due to the increase of the number of aromatic rings and, hence, the hydrophobic character of the probes, the depth of the probe localization is gradually shifted deeper inside the hydrocarbon core of the bilayer. We found that the probe-lipid hydrogen-bonding contributes weakly to the favorable localizations of the azaaromatic probes inside the DPPC bilayer, so that the probe localization is mainly driven by electrostatic dipole-dipole and van der Waals interactions.
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Affiliation(s)
- Alexander Kyrychenko
- Institute for Chemistry, V.N. Karazin Kharkov National University, 4 Svobody Sq., 61077, Kharkov, Ukraine.
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31
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Leontiadou H, Mark AE, Marrink SJ. Ion transport across transmembrane pores. Biophys J 2007; 92:4209-15. [PMID: 17384063 PMCID: PMC1877794 DOI: 10.1529/biophysj.106.101295] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2006] [Accepted: 02/07/2007] [Indexed: 11/18/2022] Open
Abstract
To study the pore-mediated transport of ionic species across a lipid membrane, a series of molecular dynamics simulations have been performed of a dipalmitoyl-phosphatidyl-choline bilayer containing a preformed water pore in the presence of sodium and chloride ions. It is found that the stability of the transient water pores is greatly reduced in the presence of the ions. Specifically, the binding of sodium cations at the lipid/water interface increases the pore line tension, resulting in a destabilization of the pore. However, the application of mechanical stress opposes this effect. The flux of ions through these mechanically stabilized pores has been analyzed. Simulations indicate that the transport of the ions through the pores depends strongly on the size of the water channel. In the presence of small pores (radius <1.5 nm) permeation is slow, with both sodium and chloride permeating at similar rates. In the case in which the pores are larger (radius >1.5 nm), a crossover is observed to a regime where the anion flux is greatly enhanced. Based on these observations, a mechanism for the basal membrane permeability of ions is discussed.
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Affiliation(s)
- Hari Leontiadou
- Groningen Biomolecular Sciences and Biotechnology Institute, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4 9747 AG, Groningen, The Netherlands
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Mukherjee S, Kombrabail M, Krishnamoorthy G, Chattopadhyay A. Dynamics and heterogeneity of bovine hippocampal membranes: role of cholesterol and proteins. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2007; 1768:2130-44. [PMID: 17618864 DOI: 10.1016/j.bbamem.2007.05.025] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2006] [Revised: 05/05/2007] [Accepted: 05/29/2007] [Indexed: 12/14/2022]
Abstract
The structural and dynamic consequence of alterations in membrane lipid composition (specifically cholesterol) in neuronal membranes is poorly understood. Previous work from our laboratory has established bovine hippocampal membranes as a convenient natural source for studying neuronal receptors. In this paper, we have explored the role of cholesterol and proteins in the dynamics and heterogeneity of bovine hippocampal membranes using fluorescence lifetime distribution analysis of the environment-sensitive fluorescent probe Nile Red incorporated into such membranes by the maximum entropy method (MEM), and time-resolved fluorescence anisotropy measurements. The peak position and the width of the lifetime distribution of Nile Red show a progressive reduction with increasing cholesterol depletion from native hippocampal membranes indicating that the extent of heterogeneity decreases with decrease in membrane cholesterol content. This is accompanied by a concomitant decrease of the fluorescence anisotropy and rotational correlation time. Our results point out that the microenvironment experienced by Nile Red is relatively insensitive to the presence of proteins in hippocampal membranes. Interestingly, Nile Red lifetime distribution in liposomes of lipid extracts is similar to that of native membranes indicating that proteins do not contribute significantly to the high level of heterogeneity observed in native membranes. These results could be relevant in understanding the neuronal diseases characterized by defective membrane lipid metabolism.
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Affiliation(s)
- Soumi Mukherjee
- Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
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33
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Queiroz MJR, Abreu AS, Castanheira EM, Ferreira PM. Synthesis of new 3-arylindole-2-carboxylates using β,β-diaryldehydroamino acids as building blocks. Fluorescence studies. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.12.084] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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34
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Mukherjee S, Raghuraman H, Chattopadhyay A. Membrane localization and dynamics of Nile Red: Effect of cholesterol. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2007; 1768:59-66. [PMID: 16934217 DOI: 10.1016/j.bbamem.2006.07.010] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2006] [Revised: 07/07/2006] [Accepted: 07/14/2006] [Indexed: 11/29/2022]
Abstract
The organization and dynamics of the hydrophobic fluorescent probe Nile Red incorporated in DOPC vesicles containing varying amounts of cholesterol has been monitored utilizing fluorescence-based approaches which include the red edge excitation shift (REES) approach and the parallax method for depth determination. Our results show that the fluorescence emission maximum, intensity, polarization, and lifetime of Nile Red vary with the cholesterol content of the membrane. Interestingly, Nile Red exhibits significant REES independent of the presence of cholesterol. This indicates that Nile Red is localized in a motionally restricted environment in the membrane. This is supported by analysis of membrane penetration depth of Nile Red using the parallax method which points out to a membrane interfacial localization of Nile Red. These results could be useful in analyzing membrane organization and heterogeneity in natural membranes using Nile Red.
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Affiliation(s)
- Soumi Mukherjee
- Centre for Cellular and Molecular Biology, Uppal Road, Hyderabad 500 007, India
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35
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Zhang X, Li ZC, Li KB, Lin S, Du FS, Li FM. Donor/acceptor vinyl monomers and their polymers: Synthesis, photochemical and photophysical behavior. Prog Polym Sci 2006. [DOI: 10.1016/j.progpolymsci.2006.08.009] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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36
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Gensure R, Zeidel M, Hill W. Lipid raft components cholesterol and sphingomyelin increase H+/OH- permeability of phosphatidylcholine membranes. Biochem J 2006; 398:485-95. [PMID: 16706750 PMCID: PMC1559473 DOI: 10.1042/bj20051620] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
H+/OH- permeation through lipid bilayers occurs at anomalously high rates and the determinants of proton flux through membranes are poorly understood. Since all life depends on proton gradients, it is important to develop a greater understanding of proton leak phenomena. We have used stopped-flow fluorimetry to probe the influence of two lipid raft components, chol (cholesterol) and SM (sphingomyelin), on H+/OH- and water permeability. Increasing the concentrations of both lipids in POPC (palmitoyl-2-oleoyl phosphatidylcholine) liposomes decreased water permeability in a concentration-dependent manner, an effect that correlated with increased lipid order. Surprisingly, proton flux was increased by increasing the concentration of chol and SM. The chol effect was complex with molar concentrations of 17.9, 33 and 45.7% giving 2.8-fold (P<0.01), 2.2-fold (P<0.001) and 5.1-fold (P<0.001) increases in H+/OH- permeability from a baseline of 2.4x10(-2) cm/s. SM at 10 mole% effected a 2.8-fold increase (P<0.01), whereas 20 and 30 mole% enhanced permeability by 3.6-fold (P<0.05) and 4.1-fold respectively (P<0.05). Supplementing membranes containing chol with SM did not enhance H+/OH- permeability. Of interest was the finding that chol addition to soya-bean lipids decreased H+/OH- permeability, consistent with an earlier report [Ira and Krishnamoorthy (2001) J. Phys. Chem. B 105, 1484-1488]. We speculate that the presence of proton carriers in crude lipid extracts might contribute to this result. We conclude that (i) chol and SM specifically and independently increase rates of proton permeation in POPC bilayers, (ii) domains enriched in these lipids or domain interfaces may represent regions with high H+/OH- conductivity, (iii) H+/OH- fluxes are not governed by lipid order and (iv) chol can inhibit or promote H+/OH- permeability depending on the total lipid environment. Theories of proton permeation are discussed in the light of these results.
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Affiliation(s)
- Rebekah H. Gensure
- Laboratory of Epithelial Cell Biology, Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, U.S.A
| | - Mark L. Zeidel
- Laboratory of Epithelial Cell Biology, Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, U.S.A
| | - Warren G. Hill
- Laboratory of Epithelial Cell Biology, Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, U.S.A
- To whom correspondence should be addressed, at the present address: Beth Israel Deaconess Medical Center, 840 Memorial Drive, Cambridge, MA 02139, U.S.A. (email )
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37
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Interaction of DODAB with neutral phospholipids and cholesterol studied using fluorescence anisotropy. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2005.11.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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38
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Queiroz MJR, Castanheira EM, Pinto AM, Ferreira IC, Begouin A, Kirsch G. Synthesis of the first thieno-δ-carboline. J Photochem Photobiol A Chem 2006. [DOI: 10.1016/j.jphotochem.2005.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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39
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Feitosa E, Alves FR, Niemiec A, Real Oliveira MECD, Castanheira EMS, Baptista ALF. Cationic liposomes in mixed didodecyldimethylammonium bromide and dioctadecyldimethylammonium bromide aqueous dispersions studied by differential scanning calorimetry, Nile Red fluorescence, and turbidity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:3579-85. [PMID: 16584229 DOI: 10.1021/la053238f] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The thermotropic phase behavior of cationic liposomes in mixtures of two of the most investigated liposome-forming double-chain lipids, dioctadecyldimethylammonium bromide (DODAB) and didodecyldimethylammonium bromide (DDAB), was investigated by differential scanning calorimetry (DSC), turbidity, and Nile Red fluorescence. The dispersions were investigated at 1.0 mM total surfactant concentration and varying DODAB and DDAB concentrations. The gel to liquid-crystalline phase transition temperatures (Tm) of neat DDAB and DODAB in aqueous dispersions are around 16 and 43 degrees C, respectively, and we aim to investigate the Tm behavior for mixtures of these cationic lipids. Overall, DDAB reduces the Tm of DODAB, the transition temperature depending on the DDAB content, but the Tm of DDAB is roughly independent of the DODAB concentration. Both DSC and fluorescence measurements show that, within the mixture, at room temperature (ca. 22 degrees C), the DDAB-rich liposomes are in the liquid-crystalline state, whereas the DODAB-rich liposomes are in the gel state. DSC results point to a higher affinity of DDAB for DODAB liposomes than the reverse, resulting in two populations of mixed DDAB/DODAB liposomes with distinctive phase behavior. Fluorescence measurements also show that the presence of a small amount of DODAB in DDAB-rich liposomes causes a pronounced effect in Nile Red emission, due to the increase in liposome size, as inferred from turbidity results.
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Affiliation(s)
- Eloi Feitosa
- Physics Department, São Paulo State University, São José do Rio Preto, SP, Brazil.
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40
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Castanheira EMS, Pinto AMR, Queiroz MJRP. Fluorescence of a benzothienopyridopyrimidone in solution and in lipid vesicles. J Fluoresc 2006; 16:251-7. [PMID: 16575549 DOI: 10.1007/s10895-005-0050-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2005] [Accepted: 12/05/2005] [Indexed: 10/24/2022]
Abstract
Fluorescence properties of a biologically active benzothienopyridopyrimidone in solution and in lipid vesicles are reported. Assays at different pH values (0.5-10) allowed the determination of pK(a) = 2.0, showing that this compound may be useful as a pH indicator for pH < or = 4. In lipid vesicles, benzothienopyridopyrimidone locates in a water-rich environment, indicating that it can be carried in the hydrophilic region of liposomes for drug delivery applications.
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41
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Hungerford G, Castanheira EMS, Baptista ALF, Coutinho PJG, Oliveira MECDR. Domain Formation in DODAB–Cholesterol Mixed Systems Monitored via Nile Red Anisotropy. J Fluoresc 2005; 15:835-40. [PMID: 16307375 DOI: 10.1007/s10895-005-0014-3] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The effect of the cholesterol (Ch) on liposomes composed of the cationic lipid dioctadecyldimethylammonium bromide (DODAB) was assessed by studying both the steady-state and time-resolved fluorescence anisotropy of the dye Nile Red. The information obtained combined with analysis of the steady-state emission and fluorescence lifetime of Nile Red (NR) for different cholesterol concentrations (5-50%) elucidated the presence of "condensed complexes" and cholesterol-rich domains in these mixed systems. The steady-state fluorescence spectra were decomposed into the sum of two lognormal emissions, emanating from two different states, and the effect of temperature on the anisotropy decay of Nile Red for different cholesterol concentrations was observed. At room temperature, the time-resolved anisotropy decays are indicative of NR being relatively immobile (manifest by a high r (infinity) value). At higher temperature, rotational times ca. 1 ns were obtained throughout and a trend in increasing hindrance was seen with increase of Ch content.
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Affiliation(s)
- Graham Hungerford
- Departamento de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
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42
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Hazra P, Chakrabarty D, Chakraborty A, Sarkar N. Intramolecular charge transfer and solvation dynamics of Nile Red in the nanocavity of cyclodextrins. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.02.078] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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43
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Nagy K, Göktürk S, Biczók L. Effect of Microenvironment on the Fluorescence of 2-Hydroxy-Substituted Nile Red Dye: A New Fluorescent Probe for the Study of Micelles. J Phys Chem A 2003. [DOI: 10.1021/jp035357e] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Krisztina Nagy
- Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
| | - Sinem Göktürk
- Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
| | - László Biczók
- Chemical Research Center, Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
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Hill WG, Kaetzel MA, Kishore BK, Dedman JR, Zeidel ML. Annexin A4 reduces water and proton permeability of model membranes but does not alter aquaporin 2-mediated water transport in isolated endosomes. J Gen Physiol 2003; 121:413-25. [PMID: 12695484 PMCID: PMC2217383 DOI: 10.1085/jgp.200308803] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2003] [Revised: 03/14/2003] [Accepted: 03/17/2003] [Indexed: 01/06/2023] Open
Abstract
Annexin A4 (Anx4) belongs to a ubiquitous family of Ca2+-dependent membrane-binding proteins thought to be involved in membrane trafficking and membrane organization within cells. Anx4 localizes to the apical region in epithelia; however, its physiological role is unclear. We show that Anx4 exhibited binding to liposomes (phosphatidylcholine:phosphatidylserine, 1:1) in the presence of Ca2+ and binding was reversible with EDTA. Anx4 binding resulted in liposome aggregation and a reduction in membrane water permeability of 29% (P < 0.001) at 25 degrees C. These effects were not seen in the presence of Ca2+ or Anx4 alone and were reversible with EDTA. Measurements of membrane fluidity made by monitoring fluorescence anisotropy of 2-(12-(7-nitrobenz-2-oxa-1,3-diazol-4-yl)amino)dodecanoyl-1-hexadecanoyl-sn-glycero-3-phosphocholine (NBD-HPC) demonstrated that Anx4 binding rigidified the outer leaflet of the bilayer (P < 0.001), thus providing a molecular explanation for the inhibition of water flux. To determine whether Anx4 would produce similar effects on physiological membranes we constructed liposomes which recapitulated the lipid composition of the inner leaflet of the MDCK apical membrane. These membranes exhibited reductions to water permeability upon Anx4 binding (19.5% at 25 degrees C, 31% at 37 degrees C; P < 0.01 and P < 0.001, respectively) and to proton permeability (15% at 25 degrees C, 19.5% at 37 degrees C; P < 0.05). Since our in vitro experiments indicated an effect on membrane permeability, we examined localization of Anx4 in the kidney collecting duct, a region of the nephron responsible for concentrating urine through water reabsorbtion. Anx4 was shown to colocalize apically with aquaporin 2 (AQP2) in collecting duct epithelia. To test for the existence of a functional interaction between Anx4 and AQP2 we isolated AQP2-containing endosomes and exposed them to Anx4/Ca2+. Water flux rates were unchanged, indicating Anx4 does not directly regulate AQP2. We conclude that Anx4 can alter the physical properties of membranes by associating with them and regulate passive membrane permeability to water and protons. These properties represent important new functions for Anx4.
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Affiliation(s)
- Warren G Hill
- Laboratory of Epithelial Cell Biology, Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh, Pittsburgh, PA 15261, USA.
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45
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Fluorescence lifetime of Nile Red as a probe for the hydrogen bonding strength with its microenvironment. Chem Phys Lett 2002. [DOI: 10.1016/s0009-2614(02)00784-4] [Citation(s) in RCA: 125] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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46
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Abstract
Proton and/or sodium electrochemical gradients are critical to energy handling at the plasma membranes of all living cells. Sodium gradients are used for animal plasma membranes, all other living organisms use proton gradients. These chemical and electrical gradients are either created by a cation pumping ATPase or are created by photons or redox, used to make ATP. It has been established that both hydrogen and sodium ions leak through lipid bilayers at approximately the same rate at the concentration they occur in living organisms. Although the gradients are achieved by pumping the cations out of the cell, the plasma membrane potential enhances the leakage rate of these cations into the cell because of the orientation of the potential. This review proposes that cells use certain lipids to inhibit cation leakage through the membrane bilayers. It assumes that Na(+) leaks through the bilayer by a defect mechanism. For Na(+) leakage in animal plasma membranes, the evidence suggests that cholesterol is a key inhibitor of Na(+) leakage. Here I put forth a novel mechanism for proton leakage through lipid bilayers. The mechanism assumes water forms protonated and deprotonated clusters in the lipid bilayer. The model suggests how two features of lipid structures may inhibit H(+) leakage. One feature is the fused ring structure of sterols, hopanoids and tetrahymenol which extrude water and therefore clusters from the bilayer. The second feature is lipid structures that crowd the center of the bilayer with hydrocarbon. This can be accomplished either by separating the two monolayers with hydrocarbons such as isoprenes or isopranes in the bilayer's cleavage plane or by branching the lipid chains in the center of the bilayers with hydrocarbon. The natural distribution of lipids that contain these features are examined. Data in the literature shows that plasma membranes exposed to extreme concentrations of cations are particularly rich in the lipids containing the predicted qualities. Prokaryote plasma membranes that reside in extreme acids (acidophiles) contain both hopanoids and iso/anteiso- terminal lipid branching. Plasma membranes that reside in extreme base (alkaliphiles) contain both squalene and iso/anteiso- lipids. The mole fraction of squalene in alkaliphile bilayers increases, as they are cultured at higher pH. In eukaryotes, cation leak inhibition is here attributed to sterols and certain isoprenes, dolichol for lysosomes and peroxysomes, ubiquinone for these in addition to mitochondrion, and plastoquinone for the chloroplast. Phytosterols differ from cholesterol because they contain methyl and ethyl branches on the side chain. The proposal provides a structure-function rationale for distinguishing the structures of the phytosterols as inhibitors of proton leaks from that of cholesterol which is proposed to inhibit leaks of Na(+). The most extensively studied of sterols, cholesterol, occurs only in animal cells where there is a sodium gradient across the plasma membrane. In mammals, nearly 100 proteins participate in cholesterol's biosynthetic and degradation pathway, its regulatory mechanisms and cell-delivery system. Although a fat, cholesterol yields no energy on degradation. Experiments have shown that it reduces Na(+) and K(+) leakage through lipid bilayers to approximately one third of bilayers that lack the sterol. If sterols significantly inhibit cation leakage through the lipids of the plasma membrane, then the general role of all sterols is to save metabolic ATP energy, which is the penalty for cation leaks into the cytosol. The regulation of cholesterol's appearance in the plasma membrane and the evolution of sterols is discussed in light of this proposed role.
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Affiliation(s)
- T H Haines
- Department of Chemistry, City College of the City University of New York and Biochemistry, City University of New York Medical School, New York, NY 10031, USA.
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