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Wilson LD, Verrall RE. A volumetric and NMR study of cyclodextrin-inhalation anesthetic complexes in aqueous solutions. CAN J CHEM 2015. [DOI: 10.1139/cjc-2014-0549] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The apparent molar volumes (Vϕ) of two anesthetics (halothane and forane) have been determined in water and in binary solvent (H2O + cyclodextrin) systems at 25 °C. The results show that the magnitudes of Vϕ are greater in ternary solutions than in the binary aqueous systems. The apparent molar volumes at infinite dilution (Vϕo) of halothane in ternary solutions are observed to depend on the following factors: (i) the magnitude of the binding constant (K1:1), (ii) the lipophilicity of the anesthetic, (iii) the mole ratio of the host/halothane system, and (iv) the topology (i.e., facial vs. inclusion) of the host/guest complex. The volumetric properties of the ternary systems have been analyzed in terms of the complexed and uncomplexed species by application of Young’s rule. The formation of 1:1 CD–halothane complexes was successfully modeled using a two-state model. The binding affinity of the various cyclodextrins toward halothane is listed in descending order as follows: DM-β-CD > HP-β-CD > β-CD > α-CD > TM-β-CD.
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Affiliation(s)
- Lee D. Wilson
- Department of Chemistry, University of Saskatchewan, 110 Science Place (Room 156), Saskatoon, SK S7N 5C9, Canada
- Department of Chemistry, University of Saskatchewan, 110 Science Place (Room 156), Saskatoon, SK S7N 5C9, Canada
| | - Ronald E. Verrall
- Department of Chemistry, University of Saskatchewan, 110 Science Place (Room 156), Saskatoon, SK S7N 5C9, Canada
- Department of Chemistry, University of Saskatchewan, 110 Science Place (Room 156), Saskatoon, SK S7N 5C9, Canada
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Steinkopf S, Hanekam L, Schaathun M, Budnjo A, Haug BE, Nerdal W. Interaction of local anaesthetic articaine enantiomers with brain lipids: A Langmuir monolayer study. Eur J Pharm Sci 2012; 47:394-401. [DOI: 10.1016/j.ejps.2012.06.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2012] [Revised: 05/31/2012] [Accepted: 06/19/2012] [Indexed: 11/29/2022]
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3
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Chau PL, Tu K, Liang K, Todorov I, Roser S, Barker R, Matubayasi N. The effect of pressure on halothane binding to hydrated DMPC bilayers. Mol Phys 2012. [DOI: 10.1080/00268976.2012.659682] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Hassan N, Gárate MP, Sandoval T, Espinoza L, Piñeiro Á, Ruso JM. On the self-assembly of a highly selective benzothiazole-based TIM inhibitor in aqueous solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:16681-16689. [PMID: 20949959 DOI: 10.1021/la102916x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Benzothiazole is a common scaffold on which many bioactive structures, including protein inhibitors and biosensors, are based. The potential self-aggregation of such molecules to form nanoparticles is relevant for a number of practical applications. 3-(2-Benzothiazolylthio)-propanesulfonic acid (BTS) has been reported as a powerful and selective inhibitor of triosephosphate isomerase from Trypanosoma cruzi, the parasite that causes the Chagas' disease. Electrical conductivity, sound velocity, density, and nuclear magnetic resonance experiments as a function of temperature and of NaCl concentration have been performed in the present work to provide a comprehensive physicochemical description of this compound in aqueous solution. Molecular dynamics simulations of the same system were also performed to characterize the structure and dynamic behavior of the corresponding aggregates at several concentrations of BTS.
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Affiliation(s)
- Natalia Hassan
- Soft Matter and Molecular Biophysics Group, Department of Applied Physics, University of Santiago de Compostela, Campus Vida s/n, 15782, Santiago de Compostela, Spain
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Kinetic medium effects on organic reactions in aqueous colloidal solutions. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY 2009. [DOI: 10.1016/s0065-3160(08)00001-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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6
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Chau PL, Tu KM, Liang K, Chan S, Matubayasi N. Free-energy change of inserting halothane into different depths of a hydrated DMPC bilayer. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.07.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Song C, Lygre H, Nerdal W. Articaine interaction with DSPC bilayer: A 13C and 31P solid-state NMR study. Eur J Pharm Sci 2008; 33:399-408. [DOI: 10.1016/j.ejps.2008.01.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2007] [Revised: 01/04/2008] [Accepted: 01/22/2008] [Indexed: 11/16/2022]
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8
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Baciu M, Holmes MC, Leaver MS. Morphological Transitions in Model Membrane Systems by the Addition of Anesthetics. J Phys Chem B 2007; 111:909-17. [PMID: 17249835 DOI: 10.1021/jp066595n] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mechanism of anesthetic action on membranes is still an open question, regardless of their extensive use in medical practice. It has been proposed that anesthetics may have the effect of promoting pore formation across membranes or at least switching transmembrane channels. In both cases this may be the result of changes in the interfacial curvature of the membrane due to the presence of anesthetic molecules. Aqueous solutions of surfactants display phases that mimic, in a simplified manner, real biological membranes. Therefore, in this study, two nonionic surfactant systems C16E6/H2O in concentrated solution and C10E3/H2O in dilute solution have been used as model membranes for the investigation of the effects of six common anesthetics (halothane, sodium thiopental, lidocaine base form and hydrochloride, prilocaine hydrochloride, and ketamine hydrochloride). Both binary surfactant-water systems exhibit phase transitions from the lamellar phase, Lalpha, that has zero spontaneous curvature and zero monolayer curvature to phases with more local interfacial curvature. These are the random mesh phase, Mh1(0), which consists of lamellae pierced by water-filled pores with local areas of positive interfacial curvature and the sponge phase, L3, that consists of the lamellar phase with interlamellae attachments, often referred to as a "melted" cubic phase, possessing negative monolayer curvature. Small-angle X-ray scattering and 2H NMR experiments upon the C16E6/2H2O system and optical observations of the C10E3/H2O system showed that all anesthetics employed in this study cause a shift in the Mh1(0) to Lalpha phase transition temperature and in the Lalpha to L3 transition temperature, respectively. All of the anesthetics studied bind to the interfacial region of the surfactant systems. Two types of behavior were observed on anesthetic addition: type I anesthetics, which decreased interfacial curvature, and type II, which increased it. However, at physiological pH both types of anesthetics decreased interfacial curvature.
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Affiliation(s)
- Magdalene Baciu
- Centre for Materials Science, Department of Physics, Astronomy, and Mathematics, University of Central Lancashire, Preston, PR1 2HE Lancashire, UK
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Carnini A, Phillips HA, Shamrakov LG, Cramb DT. Revisiting lipid general anesthetic interactions (II): Halothane location and changes in lipid bilayer microenvironment monitored by fluorescence. CAN J CHEM 2004. [DOI: 10.1139/v04-024] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A universal mechanism for the action of general anesthetics (GA) is not yet available. In this study, we investigated the interaction between halothane and 1,2-dipalmitoyl-sn-3-glycero-3-phosphocholine (DPPC) and 1,2-dioleoyl-sn-3-glycero-3-phosphocholine (DOPC) bilayers labeled with Laurdan, Prodan, and NBD-C6-PC as the reporter probes using steady-state fluorescence spectroscopy. We have evidence that halothane is located on the acyl chain side, near the headgroup region of the bilayer. Additionally, we find that halothane may be inhomogeneously distributed within DOPC and DPPC bilayers. We also show data that indicate halothane increases the free volume available to fluorescent probes. Differential scanning calorimetry and UV scanning calorimetry experiments were implemented to further observe the effects of halothane addition to the DPPC lipid bilayer. A significant shift of the phase-transition temperature of the DPPC system was observed. Our findings suggest that general anesthetic lipid bilayer interactions may play a significant role in the overall mechanism of anesthetic action, and these effects should not be ignored when interactions between membrane proteins and anesthetics are considered.Key words: liposomes, anesthesia, fluorescence, phase transition, phospholipid bilayers.
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Shikii K, Sakurai S, Utsumi H, Seki H, Tashiro M. Application of the 19F NMR Technique to Observe Binding of the General Anesthetic Halothane to Human Serum Albumin. ANAL SCI 2004; 20:1475-7. [PMID: 15524207 DOI: 10.2116/analsci.20.1475] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
19F NMR techniques were employed to characterize the binding property of the widely used general anesthetic halothane with human serum albumin (HSA). It was found that 19F(1H) NOE and 2D 1H-19F HOESY experiments detected intermolecular NOEs between halothane 19F and HSA protons. Measurements of the diffusion coefficients for halothane were also carried out by 1H and 19F NMR, indicating the interaction of halothane with HSA. The present results indicate that these techniques are very suitable to identify a fluorine-containing ligand binding with a protein receptor in the drug-discovery process.
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Affiliation(s)
- Kazuaki Shikii
- Chemical Analysis Center, Chiba University, Yayoi, Inage, Chiba 263-8522, Japan
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Yoshida T, Inagaki H, Kamya H, Ueda I. Two Types of Protein Hydration Measured by Dielectric Dispersion in the Gigahertz Region, and Effects of Anesthetics. J Phys Chem B 2000. [DOI: 10.1021/jp0021594] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Suratkar V, Mahapatra S. Solubilization Site of Organic Perfume Molecules in Sodium Dodecyl Sulfate Micelles: New Insights from Proton NMR Studies. J Colloid Interface Sci 2000; 225:32-38. [PMID: 10767142 DOI: 10.1006/jcis.2000.6718] [Citation(s) in RCA: 92] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The site of incorporation of solubilizates in sodium dodecyl sulfate (SDS) micellar systems has been investigated by proton NMR spectroscopy. The solubilizate molecules chosen for the present study are phenol, 4-methylphenol, 4-allyl-2-methoxyphenol, anisole, 4-methylanisole, 4-propenylanisole, 1,8-cineole, and limonene. These molecules possess a wide variety of functional groups with different degrees of hydrophilic/hydrophobic character and are thereby solubilized at different micellar locations. Aromatic compounds, especially those having a phenolic-OH group, showed a large upfield shift of SDS methylene protons that are closely linked to the terminal sulfate groups. Additionally, in the case of phenolic compounds, the unresolved signals of the nine straight-chain bulk methylene protons of SDS are split into a broad doublet with uneven intensity. This splitting of methylene protons was found to be dependent on the concentration of the substrate. Based on these observations, probable solubilization sites and orientation of the substrate molecule within the micelles are discussed. Phenolic compounds, being the most hydrophilic among the present set, reside at the hydrophilic/hydrophobic boundary of micelle-water interface and thus influence the resonances of SDS protons the most. Aromatic methoxy and aliphatic compounds, being relatively more hydrophobic in nature, reside inside the micellar core and thereby result in smaller shifts. Copyright 2000 Academic Press.
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Affiliation(s)
- V Suratkar
- Unilever Research India, I.C.T. Link Road, Andheri (East), Mumbai, 400 099, India
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Ueda I, Yoshida T. Hydration of lipid membranes and the action mechanisms of anesthetics and alcohols. Chem Phys Lipids 1999; 101:65-79. [PMID: 10810926 DOI: 10.1016/s0009-3084(99)00056-0] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- I Ueda
- Department of Anesthesia, Department of Veterans Affairs Medical Center, University of Utah School of Medicine, Salt Lake City 84148, USA.
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Tang P, Hu J, Liachenko S, Xu Y. Distinctly different interactions of anesthetic and nonimmobilizer with transmembrane channel peptides. Biophys J 1999; 77:739-46. [PMID: 10423422 PMCID: PMC1300368 DOI: 10.1016/s0006-3495(99)76928-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Although it plays no clinical role in general anesthesia, gramicidin A, a transmembrane channel peptide, provides an excellent model for studying the specific interaction between volatile anesthetics and membrane proteins at the molecular level. We show here that a pair of structurally similar volatile anesthetic and nonimmobilizer (nonanesthetic), 1-chloro-1,2,2-trifluorocyclobutane (F3) and 1, 2-dichlorohexafluorocyclobutane (F6), respectively, interacts differently with the transmembrane peptide. With 400 microM gramicidin A in a vesicle suspension of 60 mM phosphatidylcholine-phosphatidylglycerol (PC/PG), the intermolecular cross-relaxation rate constants between (19)F of F3 and (1)H in the chemical shift regions for the indole and backbone amide protons were 0.0106 +/- 0.0007 (n = 12) and 0.0105 +/- 0.0014 (n = 8) s(-1), respectively. No cross-relaxation was measurable between (19)F of F6 and protons in these regions. Sodium transport study showed that with 75 microM gramicidin A in a vesicle suspension of 66 mM PC/PG, F3 increased the (23)Na apparent efflux rate constant from 149.7 +/- 7.2 of control (n = 3) to 191.7 +/- 12.2 s(-1) (n = 3), and the apparent influx rate constant from 182.1 +/- 15.4 to 222.8 +/- 21.7 s(-1) (n = 3). In contrast, F6 had no effects on either influx or efflux rate. It is concluded that the ability of general anesthetics to interact with amphipathic residues near the peptide-lipid-water interface and the inability of nonimmobilizer to do the same may represent some characteristics of anesthetic-protein interaction that are of importance to general anesthesia.
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Affiliation(s)
- P Tang
- Department of Anesthesiology and Critical Care Medicine, Department of Pharmacology, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA.
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