1
|
Krogman WL, Woodard T, McKay RSF. Anesthetic Mechanisms: Synergistic Interactions With Lipid Rafts and Voltage-Gated Sodium Channels. Anesth Analg 2024; 139:92-106. [PMID: 37968836 DOI: 10.1213/ane.0000000000006738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2023]
Abstract
Despite successfully utilizing anesthetics for over 150 years, the mechanism of action remains relatively unknown. Recent studies have shown promising results, but due to the complex interactions between anesthetics and their targets, there remains a clear need for further mechanistic research. We know that lipophilicity is directly connected to anesthetic potency since lipid solubility relates to anesthetic partition into the membrane. However, clinically relevant concentrations of anesthetics do not significantly affect lipid bilayers but continue to influence various molecular targets. Lipid rafts are derived from liquid-ordered phases of the plasma membrane that contain increased concentrations of cholesterol and sphingomyelin and act as staging platforms for membrane proteins, including ion channels. Although anesthetics do not perturb membranes at clinically relevant concentrations, they have recently been shown to target lipid rafts. In this review, we summarize current research on how different types of anesthetics-local, inhalational, and intravenous-bind and affect both lipid rafts and voltage-gated sodium channels, one of their major targets, and how those effects synergize to cause anesthesia and analgesia. Local anesthetics block voltage-gated sodium channel pores while also disrupting lipid packing in ordered membranes. Inhalational anesthetics bind to the channel pore and the voltage-sensing domain while causing an increase in the number, size, and diameter of lipid rafts. Intravenous anesthetics bind to the channel primarily at the voltage-sensing domain and the selectivity filter, while causing lipid raft perturbation. These changes in lipid nanodomain structure possibly give proteins access to substrates that have translocated as a result of these structural alterations, resulting in lipid-driven anesthesia. Overall, anesthetics can impact channel activity either through direct interaction with the channel, indirectly through the lipid raft, or both. Together, these result in decreased sodium ion flux into the cell, disrupting action potentials and producing anesthetic effects. However, more research is needed to elucidate the indirect mechanisms associated with channel disruption through the lipid raft, as not much is known about anionic lipid products and their influence over voltage-gated sodium channels. Anesthetics' effect on S-palmitoylation, a promising mechanism for direct and indirect influence over voltage-gated sodium channels, is another auspicious avenue of research. Understanding the mechanisms of different types of anesthetics will allow anesthesiologists greater flexibility and more specificity when treating patients.
Collapse
Affiliation(s)
- William L Krogman
- From the Department of Anesthesiology, University of Kansas School of Medicine - Wichita, Wichita, Kansas
| | | | | |
Collapse
|
2
|
Eş I, Thakur A, Mousavi Khaneghah A, Foged C, de la Torre LG. Engineering aspects of lipid-based delivery systems: In vivo gene delivery, safety criteria, and translation strategies. Biotechnol Adv 2024; 72:108342. [PMID: 38518964 DOI: 10.1016/j.biotechadv.2024.108342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2024] [Revised: 03/11/2024] [Accepted: 03/15/2024] [Indexed: 03/24/2024]
Abstract
Defects in the genome cause genetic diseases and can be treated with gene therapy. Due to the limitations encountered in gene delivery, lipid-based supramolecular colloidal materials have emerged as promising gene carrier systems. In their non-functionalized form, lipid nanoparticles often demonstrate lower transgene expression efficiency, leading to suboptimal therapeutic outcomes, specifically through reduced percentages of cells expressing the transgene. Due to chemically active substituents, the engineering of delivery systems for genetic drugs with specific chemical ligands steps forward as an innovative strategy to tackle the drawbacks and enhance their therapeutic efficacy. Despite intense investigations into functionalization strategies, the clinical outcome of such therapies still needs to be improved. Here, we highlight and comprehensively review engineering aspects for functionalizing lipid-based delivery systems and their therapeutic efficacy for developing novel genetic cargoes to provide a full snapshot of the translation from the bench to the clinics. We outline existing challenges in the delivery and internalization processes and narrate recent advances in the functionalization of lipid-based delivery systems for nucleic acids to enhance their therapeutic efficacy and safety. Moreover, we address clinical trials using these vectors to expand their clinical use and principal safety concerns.
Collapse
Affiliation(s)
- Ismail Eş
- Department of Material and Bioprocess Engineering, School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil; Institute of Biomedical Engineering, Old Road Campus Research Building, University of Oxford, Headington, Oxford OX3 7DQ, UK.
| | - Aneesh Thakur
- Vaccine and Infectious Disease Organization, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Amin Mousavi Khaneghah
- Faculty of Biotechnologies (BioTech), ITMO University 191002, 9 Lomonosova Street, Saint Petersburg, Russia.
| | - Camilla Foged
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark.
| | - Lucimara Gaziola de la Torre
- Department of Material and Bioprocess Engineering, School of Chemical Engineering, University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
| |
Collapse
|
3
|
Slavkova Z, Yancheva D, Genova J. Phase behaviour and structural properties of SOPC model lipid system in a sucrose solution. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2024; 304:123287. [PMID: 37633099 DOI: 10.1016/j.saa.2023.123287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 08/17/2023] [Accepted: 08/19/2023] [Indexed: 08/28/2023]
Abstract
Lipid membranes are an important component of the biological cell. The profound understanding of their structure and functionality, as well as, the influence of various biologically relevant admixtures on their main characteristics is of great importance for research and development in medicine and pharmacology. The effect of sugars on the behaviour of the membrane cell enjoys an ever-increasing interest as they are biologically significant substances. We have studied the influence of the disaccharide sucrose on the physicochemical properties of SOPC (1-stearoyl-2-oleoyl-sn- glycero-3-phosphocholine) lipid system aiming to gain better understanding of the mechanisms of the interaction between both substances. For that purpose, we have used differential scanning calorimetry and Fourier-transform infrared spectroscopy. Our results show that adding sugar up to 300 mM concentration substantially alters the thermodynamic and structural properties of SOPC. The DSC thermograms at heating reveal a general lowering of the SOPC transition temperature Tm from gel to liquid crystalline phase (main phase transition, ordered-disordered phase transition) in the presence of sugar. The corresponding peaks are smeared and harder to trace. In agreement with this, a gradual decrease of the enthalpy values up to 300 mM was measured. The IR spectroscopy study provided spectral evidence for two states of hydration of the phosphate groups in the sugar-SOPC model systems suggesting a mechanism of interaction where only part of the phospholipid headgroups are hydrogen bonded to the sugar molecules. The obtained results are in good agreement with various earlier data including results about the bending elasticity moduli, as well as, some theoretical simulations on the sugar-lipid interactions. The current results also reinforce the potential of sucrose to be used as a cell protector against drought at, both, high and low temperatures.
Collapse
Affiliation(s)
- Zdravka Slavkova
- G. Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussée blvd., 1784 Sofia, Bulgaria; Joint Institute for Nuclear Research, 6 Joliot-Curie St., Dubna, Moscow Region 141980, Russia
| | - Denitsa Yancheva
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Acad. G. Bonchev St., Build. 9, 1113 Sofia, Bulgaria.
| | - Julia Genova
- G. Nadjakov Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussée blvd., 1784 Sofia, Bulgaria
| |
Collapse
|
4
|
Chapron D, Michel JP, Fontaine P, Godard J, Brégier F, Sol V, Rosilio V. Thermodynamic and structural properties of lipid-photosensitizer conjugates mixed with phospholipids: Impact on the formation and stability of nano-assemblies. Colloids Surf B Biointerfaces 2023; 231:113565. [PMID: 37778109 DOI: 10.1016/j.colsurfb.2023.113565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 09/21/2023] [Accepted: 09/23/2023] [Indexed: 10/03/2023]
Abstract
The photosensitizer Phenalenone (PN) was grafted with one or two lipid (C18) chains to form pure nano-assemblies or mixed lipid vesicles suitable for photodynamic therapy. Mixtures of PN-C18 conjugates with stearoyl-oleoyl phosphatidylcholine (SOPC) form vesicles that disintegrate into bilayer sheets as the concentration of PN-C18 conjugates increases. We hypothesized that PN-C18 conjugates control the thermodynamic and structural properties of the mixtures and induce the disintegration of vesicles due to PN π-π-interactions. Monolayers were analyzed by surface pressure and grazing incidence X-ray diffraction (GIXD) measurements, and vesicles by differential scanning calorimetry and cryo-TEM. The results showed that PN-triazole-C18 (1A) and PN-NH-C18 (1B) segregate from the phospholipid domains. PN-(C18)2 (conjugate 2) develops favorable interactions with SOPC and distearoyl-phosphatidylcholine (DSPC). GIXD demonstrates the contribution of SOPC to the structuring of conjugate 2 and the role of the major component in controlling the structural properties of DSPC-conjugate 2 mixtures. Above 10 mol% conjugate 2 in SOPC vesicles, the coexistence of domains with different molecule packing leads to conjugate segregation, vesicle deformation, and the formation of small bilayer discs stabilized by the inter-bilayer π-π stacking of PN molecules.
Collapse
Affiliation(s)
- David Chapron
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 avenue des Sciences, F-91400 Orsay, France; CNRS, GDR 2025 HappyBio, Université d'Orléans, 14 rue d'Issoudun, BP 6744, 45067 Orléans cedex 2, France
| | - Jean-Philippe Michel
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 avenue des Sciences, F-91400 Orsay, France; CNRS, GDR 2025 HappyBio, Université d'Orléans, 14 rue d'Issoudun, BP 6744, 45067 Orléans cedex 2, France
| | - Philippe Fontaine
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, 91190 Saint-Aubin, France
| | - Jérémy Godard
- Univ. Limoges, LABCiS, UR 22722, 123 avenue Albert Thomas, F-87000, Limoges, France
| | - Frédérique Brégier
- Univ. Limoges, LABCiS, UR 22722, 123 avenue Albert Thomas, F-87000, Limoges, France; CNRS, GDR 2025 HappyBio, Université d'Orléans, 14 rue d'Issoudun, BP 6744, 45067 Orléans cedex 2, France
| | - Vincent Sol
- Univ. Limoges, LABCiS, UR 22722, 123 avenue Albert Thomas, F-87000, Limoges, France; CNRS, GDR 2025 HappyBio, Université d'Orléans, 14 rue d'Issoudun, BP 6744, 45067 Orléans cedex 2, France
| | - Véronique Rosilio
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 17 avenue des Sciences, F-91400 Orsay, France; CNRS, GDR 2025 HappyBio, Université d'Orléans, 14 rue d'Issoudun, BP 6744, 45067 Orléans cedex 2, France.
| |
Collapse
|
5
|
Hsu TW, Yang CH, Su CJ, Huang YT, Yeh YQ, Liao KF, Lin TC, Shih O, Lee MT, Su AC, Jeng US. Revealing cholesterol effects on PEGylated HSPC liposomes using AF4-MALS and simultaneous small- and wide-angle X-ray scattering. J Appl Crystallogr 2023; 56:988-993. [PMID: 37555211 PMCID: PMC10405602 DOI: 10.1107/s1600576723005393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 06/16/2023] [Indexed: 08/10/2023] Open
Abstract
Liposome development is of great interest owing to increasing requirements for efficient drug carriers. The structural features and thermal stability of such liposomes are crucial in drug transport and delivery. Reported here are the results of the structural characterization of PEGylated liposomes via small- and wide-angle X-ray scattering and an asymmetric flow field-flow fractionation (AF4) system coupled with differential refractive-index detection, multi-angle light scattering (MALS) and dynamic light scattering. This integrated analysis of the exemplar PEGylated liposome formed from hydrogenated soy phosphatid-yl-choline (HSPC) with the addition of cholesterol reveals an average hydro-dynamic radius (R h) of 52 nm with 10% polydispersity, a comparable radius of gyration (R g) and a major liposome particle mass of 118 kDa. The local bilayer structure of the liposome is found to have asymmetric electronic density profiles in the inner and outer leaflets, sandwiched by two PEGylated outer layers ca 5 nm thick. Cholesterol was found to effectively intervene in lipid chain packing, resulting in the thickening of the liposome bilayer, an increase in the area per lipid and an increase in liposome size, especially in the fluid phase of the liposome. These cholesterol effects show signs of saturation at cholesterol concentrations above ca 1:5 cholesterol:lipid molar ratio.
Collapse
Affiliation(s)
- Ting-Wei Hsu
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Ching-Hsun Yang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Chun-Jen Su
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Yin-Tzu Huang
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Yi-Qi Yeh
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Kuei-Fen Liao
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Tien-Chang Lin
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - Orion Shih
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
| | - Ming-Tao Lee
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
- Department of Physics, National Central University, Zhongli 320317, Taiwan
| | - An-Chung Su
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan
| | - U-Ser Jeng
- National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 300094, Taiwan
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300044, Taiwan
- College of Semiconductor Research, National Tsing Hua University, Hsinchu 300044, Taiwan
| |
Collapse
|
6
|
Maleš P, Brkljača Z, Domazet Jurašin D, Bakarić D. New spirit of an old technique: Characterization of lipid phase transitions via UV/Vis spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 272:121013. [PMID: 35176647 DOI: 10.1016/j.saa.2022.121013] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/26/2022] [Accepted: 02/04/2022] [Indexed: 06/14/2023]
Abstract
One of the advantages of investigating lipid phase transitions by thermoanalytical techniques such as DSC is manifested in the proportionality of the signal strength on a DSC curve, attributed to a particular thermotropic event, and its cooperativity degree. Accordingly, the pretransition of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) is less noticeable than its main phase transition; as a matter of fact, when DSC measurements are performed at low heating rate, such low-cooperativity phase transition could go (almost) unnoticed. The aim of this work is to present temperature-dependent UV/Vis spectroscopy, based on a temperature-dependent change in DPPC suspension turbidity, as a technique applicable for determination of lipid phase transition temperatures. Multivariate analyzes of the acquired UV/Vis spectra show that phase transitions of the low-cooperativity degree, such as pretransitions, can be identified with the same certainty as transitions of a high-cooperativity degree.
Collapse
Affiliation(s)
- Petra Maleš
- Division for Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Zlatko Brkljača
- Division for Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Darija Domazet Jurašin
- Division for Physical Chemistry, Ruđer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia
| | - Danijela Bakarić
- Division for Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, Zagreb 10000, Croatia.
| |
Collapse
|
7
|
Nakao T, Goto M, Kurashina M, Tamai N, Yasuzawa M, Matsuki H. Temperature- and Pressure-Induced Bilayer Phase Transitions of an Amide-Linked Phosphatidylcholine: A Contrasting Effect of Chain-Linkage Type. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Toshiki Nakao
- Graduate School of Advanced Technology and Science, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Masaki Goto
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Masashi Kurashina
- Department of Applied Chemistry, Division of Science and Technology, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Nobutake Tamai
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Mikito Yasuzawa
- Department of Applied Chemistry, Division of Science and Technology, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Hitoshi Matsuki
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| |
Collapse
|
8
|
Goto M, Kazama A, Fukuhara K, Sato H, Tamai N, Ito HO, Matsuki H. Membrane fusion of phospholipid bilayers under high pressure: Spherical and irreversible growth of giant vesicles. Biophys Chem 2021; 277:106639. [PMID: 34171580 DOI: 10.1016/j.bpc.2021.106639] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/29/2021] [Accepted: 06/04/2021] [Indexed: 10/21/2022]
Abstract
Membrane fusion of giant vesicles (GVs) for binary bilayers of unsaturated phospholipids, dioleoylphosphatidyl-ethanolamine (DOPE) having an ability to promote membrane fusion, and its homolog dioleoylphosphatidylcholine (DOPC) having an ability to form GV, was investigated under atmospheric and high pressure. While DOPC formed GVs in the presence of inorganic salts with a multivalent metal ion under atmospheric pressure, an equimolar mixture of DOPE and DOPC formed GVs both in the absence and the presence of LaCl3. We examined the change in size and shape of the GVs of this binary mixture in the absence and presence of LaCl3 as a function of time under atmospheric and high pressure. The size and shape of the GVs in the absence of LaCl3 under atmospheric and high pressure and those in the presence of LaCl3 under atmospheric pressure hardly changed with time. By contrast, the GV in the presence of LaCl3 under high pressure gradually changed in the size and shape with time on a time scale of several hours. Namely, the GV became larger than the original GV due to accelerated membrane fusion and its shape became more spherical. This pressure-induced membrane fusion was completely irreversible, and the growth rate was correlated with the applied pressure. The reason for the GV growth by applying pressure was considered on the basis of thermodynamic phase diagrams. We concluded that the growth is attributable to a closer packing of lipid molecules in the bilayer resulting from their preference of smaller volumes under high pressure. Furthermore, the molecular mechanism of the pressure-induced membrane fusion was explored by observing the fusion of two GVs with almost the same size. From their morphological changes, we revealed that the fusion is caused by the actions of Laplace and osmotic pressure.
Collapse
Affiliation(s)
- Masaki Goto
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Akira Kazama
- Department of Biological Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Kensuke Fukuhara
- Department of Biological Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Honami Sato
- Department of Biological Science and Technology, Faculty of Engineering, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | - Nobutake Tamai
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan
| | - Hiro-O Ito
- Department of Preventive Dentistry, Division of Oral Science, Graduate School of Biomedical Sciences, Tokushima University, 3-8-15 Kuramoto-cho, Tokushima 770-8504, Japan
| | - Hitoshi Matsuki
- Department of Bioengineering, Division of Bioscience and Bioindustry, Graduate School of Technology, Industrial and Social Sciences, Tokushima University, 2-1 Minamijosanjima-cho, Tokushima 770-8513, Japan.
| |
Collapse
|
9
|
Nierzwicki Ł, Olewniczak M, Chodnicki P, Czub J. Role of cholesterol in substrate recognition by [Formula: see text]-secretase. Sci Rep 2021; 11:15213. [PMID: 34312439 PMCID: PMC8313713 DOI: 10.1038/s41598-021-94618-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 07/13/2021] [Indexed: 12/14/2022] Open
Abstract
[Formula: see text]-Secretase is an enzyme known to cleave multiple substrates within their transmembrane domains, with the amyloid precursor protein of Alzheimer's Disease among the most prominent examples. The activity of [Formula: see text]-secretase strictly depends on the membrane cholesterol content, yet the mechanistic role of cholesterol in the substrate binding and cleavage remains unclear. In this work, we used all-atom molecular dynamics simulations to examine the role of cholesterol in the initial binding of a direct precursor of [Formula: see text]-amyloid polypeptides by [Formula: see text]-secretase. We showed that in cholesterol-rich membranes, both the substrate and the enzyme region proximal to the active site induce a local membrane thinning. With the free energy methods we found that in the presence of cholesterol the substrate binds favorably to the identified exosite, while cholesterol depletion completely abolishes the binding. To explain these findings, we directly examined the role of hydrophobic mismatch in the substrate binding to [Formula: see text]-secretase, showing that increased membrane thickness results in higher propensity of the enzyme to bind substrates. Therefore, we propose that cholesterol promotes substrate binding to [Formula: see text]-secretase by increasing the membrane thickness, which leads to the negative hydrophobic mismatch between the membrane and binding partners.
Collapse
Affiliation(s)
- Łukasz Nierzwicki
- Department of Physical Chemistry, Gdansk University of Technology, Gdansk, 80-233 Poland
| | - Michał Olewniczak
- Department of Physical Chemistry, Gdansk University of Technology, Gdansk, 80-233 Poland
| | - Paweł Chodnicki
- Department of Physical Chemistry, Gdansk University of Technology, Gdansk, 80-233 Poland
| | - Jacek Czub
- Department of Physical Chemistry, Gdansk University of Technology, Gdansk, 80-233 Poland
| |
Collapse
|
10
|
El Hajj F, Fuchs PFJ, Urbach W, Nassereddine M, Hamieh S, Taulier N. Molecular Study of Ultrasound-Triggered Release of Fluorescein from Liposomes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:3868-3881. [PMID: 33769822 DOI: 10.1021/acs.langmuir.0c03444] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Several investigations have suggested that ultrasound triggers the release of drugs encapsulated into liposomes at acoustic pressures low enough to avoid cavitation or high hyperthermia. However, the mechanism leading to this triggered release as well as the adequate composition of the liposome membrane remains unknown. Here, we investigate the ultrasound-triggered release of fluorescein disodium salt encapsulated into liposomes made of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) or 1,2-distearoylphosphatidyl-ethanolamine (DSPC) lipids with various concentrations of cholesterol (from 0 to 44 mol %). The passive release of encapsulated fluorescein was first characterized. It was observed to be higher when the membrane is in a fluid phase and increased with temperature but decreased upon addition of cholesterol. Next, the release of fluorescein was measured at different acoustic frequencies (0.8, 1.1, and 3.3 MHz) and peak-to-peak pressures (0, 2, 2.5, 5, and 8 MPa). Measurements were performed at temperatures where DOPC and DSPC liposomes were, respectively, in the fluid or gel phase. We found that the release rate did not depend on the ultrasound frequency. For DOPC liposomes, the ultrasound-triggered release of fluorescein decreased with increasing concentration of cholesterol in liposomes, while the behavior was more complex for DSPC liposomes. Overall, the triggered release from DSPC liposomes was up to ten times less than DOPC liposomes. Molecular dynamics simulations performed on a pure DOPC membrane showed that a membrane experiences, under a directional pressure of ±2.4 MPa, various changes in properties such as the area per lipid (APL). An increase in the APL was notably observed when the simulation box was laterally stretched or perpendicularly compressed, which was accompanied by an increase in the number of water molecules crossing the membrane. This suggests that ultrasound most probably enhances the diffusion of encapsulated molecules at small acoustic pressures by increasing the distance between lipids.
Collapse
Affiliation(s)
- Fatima El Hajj
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale, LIB, F-75006 Paris, France
- Faculté des Sciences, Université Libanaise, Hadath 1003, Liban
| | - Patrick F J Fuchs
- Université de Paris, UFR Sciences du Vivant, F-75013 Paris, France
- Sorbonne Université, Ecole Normale Supérieure, PSL Research University, CNRS, Laboratoire des Biomolécules (LBM), F-75005 Paris, France
| | - Wladimir Urbach
- Laboratoire de Physique de l'École Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université de Paris, F-75005 Paris, France
| | | | - Salah Hamieh
- Faculté des Sciences, Université Libanaise, Hadath 1003, Liban
| | - Nicolas Taulier
- Sorbonne Université, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale, LIB, F-75006 Paris, France
| |
Collapse
|
11
|
Evaluation of the correlation between porphyrin accumulation in cancer cells and functional positions for application as a drug carrier. Sci Rep 2021; 11:2046. [PMID: 33479459 PMCID: PMC7820339 DOI: 10.1038/s41598-021-81725-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/11/2021] [Indexed: 01/29/2023] Open
Abstract
Porphyrin derivatives accumulate selectively in cancer cells and are can be used as carriers of drugs. Until now, the substituents that bind to porphyrins (mainly at the meso-position) have been actively investigated, but the effect of the functional porphyrin positions (β-, meso-position) on tumor accumulation has not been investigated. Therefore, we investigated the correlation between the functional position of substituents and the accumulation of porphyrins in cancer cells using cancer cells. We found that the meso-derivative showed higher accumulation in cancer cells than the β-derivative, and porphyrins with less bulky substituent actively accumulate in cancer cells. When evaluating the intracellular distribution of porphyrin, we found that porphyrin was internalized by endocytosis and direct membrane permeation. As factors involved in these two permeation mechanisms, we evaluated the affinity between porphyrin-protein (endocytosis) and the permeability to the phospholipid bilayer membrane (direct membrane permeation). We found that the binding position of porphyrin affects the factors involved in the transmembrane permeation mechanisms and impacts the accumulation in cancer cells.
Collapse
|
12
|
Potekhin SA, Khusainova RS. On the Width of Conformational Transitions of Biologically Important Macromolecules under the Influence of Pressure. Biophysics (Nagoya-shi) 2019. [DOI: 10.1134/s0006350919030187] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
13
|
Rabinovich AL, Lyubartsev AP, Zhurkin DV. Unperturbed hydrocarbon chains and liquid phase bilayer lipid chains: a computer simulation study. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2017; 47:109-130. [PMID: 28698919 PMCID: PMC5834621 DOI: 10.1007/s00249-017-1231-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 04/13/2017] [Accepted: 06/07/2017] [Indexed: 11/24/2022]
Abstract
In this work, the properties of saturated and unsaturated fatty acid acyl chains 16:0, 18:0, 18:1(n-9)cis, 18:2(n-6)cis, 18:3(n-3)cis, 18:4(n-3)cis, 18:5(n-3)cis, 20:4(n-6)cis, 20:5(n-3)cis and 22:6(n-3)cis in a bilayer liquid crystalline state and similar hydrocarbon chains (with CH[Formula: see text] terminal groups instead of C=O groups) in the unperturbed state characterised by a lack of long-range interaction were investigated. The unperturbed hydrocarbon chains were modelled by Monte Carlo simulations at temperature [Formula: see text] K; sixteen fully hydrated homogeneous liquid crystalline phosphatidylcholine bilayers containing these chains were studied by molecular dynamics simulations at the same temperature. To eliminate effects of the simulation parameters, the molecular dynamics and Monte Carlo simulations were carried out using the same structural data and force field coefficients. From these computer simulations, the average distances between terminal carbon atoms of the chains (end-to-end distances) were calculated and compared. The trends in the end-to-end distances obtained for the unperturbed chains were found to be qualitatively similar to those obtained for the same lipid chains in the bilayers. So, for understanding of a number of processes in biological membranes (e.g., changes in fatty acid composition caused by environmental changes such as temperature and pressure), it is possible to use, at least as a first approximation, the relationships between the structure and properties for unperturbed or isolated hydrocarbon chains.
Collapse
Affiliation(s)
- Alexander L Rabinovich
- Institute of Biology, Karelian Research Center, Russian Academy of Sciences, Pushkinskaya 11, Petrozavodsk, 185910, Russian Federation
| | - Alexander P Lyubartsev
- Department of Materials and Environmental Chemistry, Stockholm University, 106 91, Stockholm, Sweden.
| | - Dmitrii V Zhurkin
- Physics and Technology Department, Petrozavodsk State University, Universitetskaya 10, Petrozavodsk, 185910, Russian Federation
| |
Collapse
|
14
|
Matsuki H, Endo S, Sueyoshi R, Goto M, Tamai N, Kaneshina S. Thermotropic and barotropic phase transitions on diacylphosphatidylethanolamine bilayer membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1222-1232. [DOI: 10.1016/j.bbamem.2017.03.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Revised: 03/03/2017] [Accepted: 03/29/2017] [Indexed: 11/30/2022]
|
15
|
Potekhin SA, Khusainova RS. Dependence on acyl chain length of energy and volume parameters of the gel to liquid-crystalline transition of 1,2-diacylphosphatidylcholines. Theoretical consideration. Biophys Chem 2017; 227:29-33. [PMID: 28578831 DOI: 10.1016/j.bpc.2017.05.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 05/03/2017] [Accepted: 05/17/2017] [Indexed: 11/29/2022]
Abstract
The effect of acyl chain length on energy and volume parameters of gel to liquid-crystal transitions in phospholipids is analyzed. It is demonstrated that simple structural and thermodynamic considerations allow predicting some thermodynamic and volume characteristics of transitions and their dependencies on the acyl chains length.
Collapse
Affiliation(s)
- Sergey A Potekhin
- Institute of Protein Research, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia.
| | - Railya S Khusainova
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, 142290 Pushchino, Moscow Region, Russia
| |
Collapse
|
16
|
Dent MR, López-Duarte I, Dickson CJ, Chairatana P, Anderson HL, Gould IR, Wylie D, Vyšniauskas A, Brooks NJ, Kuimova MK. Imaging plasma membrane phase behaviour in live cells using a thiophene-based molecular rotor. Chem Commun (Camb) 2016; 52:13269-13272. [DOI: 10.1039/c6cc05954f] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A thiophene-based molecular rotor was used to probe ordering and viscosity within artificial lipid bilayers and live cell plasma membranes.
Collapse
Affiliation(s)
| | - Ismael López-Duarte
- Department of Chemistry
- Imperial College London
- London
- UK
- Department of Chemistry
| | - Callum J. Dickson
- Computer-Aided Drug Discovery
- Global Discovery Chemistry
- Novartis Institutes for BioMedical Research
- Cambridge
- USA
| | - Phoom Chairatana
- Department of Chemistry
- Chemistry Research Laboratory
- Oxford University
- Oxford
- UK
| | - Harry L. Anderson
- Department of Chemistry
- Chemistry Research Laboratory
- Oxford University
- Oxford
- UK
| | - Ian R. Gould
- Department of Chemistry
- Imperial College London
- London
- UK
| | - Douglas Wylie
- Department of Chemistry
- Imperial College London
- London
- UK
| | | | | | | |
Collapse
|
17
|
Takano T, Kawabata Y, Suzuki T, Kato T. Pressure-Induced Transition of Bilayers in a Nonionic Surfactant Solution. J Phys Chem B 2015; 119:11656-63. [DOI: 10.1021/acs.jpcb.5b04880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tetsuo Takano
- Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Youhei Kawabata
- Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Takuro Suzuki
- Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| | - Tadashi Kato
- Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
| |
Collapse
|
18
|
Abstract
Bilayers formed by phospholipids are fundamental structures of biological membranes. The mechanical perturbation brought about by pressure significantly affects the membrane states of phospholipid bilayers. In this chapter, we focus our attention on the pressure responsivity for bilayers of some major phospholipids contained in biological membranes. At first, the membrane states and phase transitions of phospholipid bilayers depending on water content, temperature and pressure are explained by using the bilayer phase diagrams of dipalmitoylphosphatidylcholine (DPPC), which is the most familiar phospholipid in model membrane studies. Subsequently, the thermotropic and barotropic bilayer phase behavior of various kinds of phospholipids with different molecular structures is discussed from the comparison of their temperature--pressure phase diagrams to that of the DPPC bilayer. It turns out that a slight change in the molecular structure of the phospholipids produces a significant difference in the bilayer phase behavior. The systematic pressure studies on the phase behavior of the phospholipid bilayers reveal not only the pressure responsivity for the bilayers but also the role and meaning of several important phospholipids existing in real biological membranes.
Collapse
|
19
|
Abe F. Effects of High Hydrostatic Pressure on Microbial Cell Membranes: Structural and Functional Perspectives. Subcell Biochem 2015; 72:371-381. [PMID: 26174391 DOI: 10.1007/978-94-017-9918-8_18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Biological processes associated with dynamic structural features of membranes are highly sensitive to changes in hydrostatic pressure and temperature. Marine organisms potentially experience a broad range of pressure and temperature fluctuations. Hence, they have specialized cell membranes to perform membrane protein functions under various environmental conditions. Although the effects of high pressure on artificial lipid bilayers have been investigated in detail, little is known about how high pressure affects the structure of natural cell membranes and how organisms cope with pressure alterations. This review focused on the recent advances in research on the effects of high pressure on microbial membranes, particularly on the use of time-resolved fluorescence anisotropy measurement to determine membrane dynamics in deep-sea piezophiles.
Collapse
Affiliation(s)
- Fumiyoshi Abe
- Department of Chemistry and Biological Science, College of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, 252-5258, Japan,
| |
Collapse
|
20
|
Mhashal AR, Roy S. Effect of gold nanoparticle on structure and fluidity of lipid membrane. PLoS One 2014; 9:e114152. [PMID: 25469786 PMCID: PMC4255040 DOI: 10.1371/journal.pone.0114152] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2014] [Accepted: 11/03/2014] [Indexed: 01/01/2023] Open
Abstract
This paper deals with the effect of different size gold nanoparticles on the fluidity of lipid membrane at different regions of the bilayer. To investigate this, we have considered significantly large bilayer leaflets and incorporated only one nanoparticle each time, which was subjected to all atomistic molecular dynamics simulations. We have observed that, lipid molecules located near to the gold nanoparticle interact directly with it, which results in deformation of lipid structure and slower dynamics of lipid molecules. However, lipid molecules far away from the interaction site of the nanoparticle get perturbed, which gives rise to increase in local ordering of the lipid domains and decrease in fluidity. The bilayer thickness and area per head group in this region also get altered. Similar trend, but with different magnitude is also observed when different size nanoparticle interact with the bilayer.
Collapse
Affiliation(s)
- Anil R. Mhashal
- Physical Chemistry Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
| | - Sudip Roy
- Physical Chemistry Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
- * E-mail:
| |
Collapse
|
21
|
Abe F. Dynamic structural changes in microbial membranes in response to high hydrostatic pressure analyzed using time-resolved fluorescence anisotropy measurement. Biophys Chem 2013; 183:3-8. [DOI: 10.1016/j.bpc.2013.05.005] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 05/10/2013] [Accepted: 05/14/2013] [Indexed: 02/03/2023]
|
22
|
Matsuki H, Goto M, Tada K, Tamai N. Thermotropic and barotropic phase behavior of phosphatidylcholine bilayers. Int J Mol Sci 2013; 14:2282-302. [PMID: 23348926 PMCID: PMC3587988 DOI: 10.3390/ijms14022282] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 01/11/2013] [Accepted: 01/15/2013] [Indexed: 11/17/2022] Open
Abstract
Bilayers formed by phospholipids are frequently used as model biological membranes in various life science studies. A characteristic feature of phospholipid bilayers is to undergo a structural change called a phase transition in response to environmental changes of their surroundings. In this review, we focus our attention on phase transitions of some major phospholipids contained in biological membranes, phosphatidylcholines (PCs), depending on temperature and pressure. Bilayers of dipalmitoylphosphatidylcholine (DPPC), which is the most representative lipid in model membrane studies, will first be explained. Then, the bilayer phase behavior of various kinds of PCs with different molecular structures is revealed from the temperature-pressure phase diagrams, and the difference in phase stability among these PC bilayers is discussed in connection with the molecular structure of the PC molecules. Furthermore, the solvent effect on the phase behavior is also described briefly.
Collapse
Affiliation(s)
- Hitoshi Matsuki
- Department of Life System, Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan; E-Mails: (M.G.); (N.T.)
| | - Masaki Goto
- Department of Life System, Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan; E-Mails: (M.G.); (N.T.)
| | - Kaori Tada
- Department of Material Science and Technology, Kochi National College of Technology, 200-1 Monobe-otsu, Nankoku, Kochi 783-8508, Japan; E-Mail:
| | - Nobutake Tamai
- Department of Life System, Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan; E-Mails: (M.G.); (N.T.)
| |
Collapse
|
23
|
Wiącek AE. Influence of dipalmitoylphosphatidylcholine (or dioleoylphosphatidylcholine) and phospholipase A2 enzyme on the properties of emulsions. J Colloid Interface Sci 2012; 373:75-83. [DOI: 10.1016/j.jcis.2011.09.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2011] [Revised: 09/15/2011] [Accepted: 09/16/2011] [Indexed: 10/17/2022]
|
24
|
Volumetric characterization of ester- and ether-linked lipid bilayers by pressure perturbation calorimetry and densitometry. Colloids Surf B Biointerfaces 2012; 92:232-9. [DOI: 10.1016/j.colsurfb.2011.11.055] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 11/25/2011] [Accepted: 11/28/2011] [Indexed: 11/17/2022]
|
25
|
Eicosapentaenoic acid plays a role in stabilizing dynamic membrane structure in the deep-sea piezophile Shewanella violacea: a study employing high-pressure time-resolved fluorescence anisotropy measurement. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1818:574-83. [PMID: 22037146 DOI: 10.1016/j.bbamem.2011.10.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Revised: 09/29/2011] [Accepted: 10/10/2011] [Indexed: 11/24/2022]
Abstract
Shewanella violacea DSS12 is a psychrophilic piezophile that optimally grows at 30MPa. It contains a substantial amount of eicosapentaenoic acid (EPA) in the membrane. Despite evidence linking increased fatty acid unsaturation and bacterial growth under high pressure, little is known of how the physicochemical properties of the membrane are modulated by unsaturated fatty acids in vivo. By means of the newly developed system performing time-resolved fluorescence anisotropy measurement under high pressure (HP-TRFAM), we demonstrate that the membrane of S. violacea is highly ordered at 0.1MPa and 10°C with the order parameter S of 0.9, and the rotational diffusion coefficient D(w) of 5.4μs(-1) for 1-[4-(trimethylamino)pheny]-6-phenyl-1,3,5-hexatriene in the membrane. Deletion of pfaA encoding the omega-3 polyunsaturated fatty acid synthase caused disorder of the membrane and enhanced the rotational motion of acyl chains, in concert with a 2-fold increase in the palmitoleic acid level. While the wild-type membrane was unperturbed over a wide range of pressures with respect to relatively small effects of pressure on S and D(w), the ΔpfaA membrane was disturbed judging from the degree of increased S and decreased D(w). These results suggest that EPA prevents the membrane from becoming hyperfluid and maintains membrane stability against significant changes in pressure. Our results counter the generally accepted concept that greater fluidity is a membrane characteristic of microorganisms that inhabit cold, high-pressure environments. We suggest that retaining a certain level of membrane physical properties under high pressure is more important than conferring membrane fluidity alone.
Collapse
|
26
|
Potekhin SA, Senin AA, Abdurakhmanov NN, Khusainova RS. Thermodynamic invariants of gel to the liquid-crystal 1,2-diacylphosphatidylcholines transition. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:1806-10. [DOI: 10.1016/j.bbamem.2011.02.020] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2010] [Revised: 02/09/2011] [Accepted: 02/28/2011] [Indexed: 11/30/2022]
|
27
|
Tada K, Goto M, Tamai N, Matsuki H, Kaneshina S. Pressure effect on the bilayer phase transition of asymmetric lipids with an unsaturated acyl chain. Ann N Y Acad Sci 2010; 1189:77-85. [PMID: 20233371 DOI: 10.1111/j.1749-6632.2009.05203.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The bilayer phase transitions of mixed-chain lipids with monounsaturated acyl chain in the sn-2 position, 1-myristoyl-2-oleoyl-sn-glycero-3-phosphocholine (MOPC), 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC), and 1-stearoyl-2-oleoyl-sn-glycero-3-phosphocholine (SOPC), and with a polyunsaturated acyl chain in the sn-2 position, 1-stearoyl-2-linoleoyl-sn-glycero-3-phosphocholine (SLPC), 1-stearoyl-2-arachidonoyl-sn-glycero-3-phosphocholine (SAPC), and 1-stearoyl-2-docosahexaenoyl-sn-glycero-3-phosphocholine (SDPC), were observed by differential scanning calorimetry (DSC) under ambient pressure and by light-transmittance measurements under high pressure. The DSC thermogram for each lipid bilayer showed only one transition between the lamellar gel and liquid crystalline phases. The introduction of one or two cis double bonds into the sn-2 acyl chain caused the significant depression of the main-transition temperature and an obvious decrease of enthalpy and volume changes associated with the transition. These features are attributable to loose packing of saturated and unsaturated acyl chains in the bilayer gel phase. The existence of four or six double bonds in the sn-2 chain produced no further decrease in the transition temperature, and in fact six double bonds caused a slight increase in the transition temperature. Thermodynamic properties associated with the bilayer phase transition were discussed.
Collapse
Affiliation(s)
- Kaori Tada
- Department of Biological Science and Technology, The University of Tokushima, Japan
| | | | | | | | | |
Collapse
|
28
|
Broniec A, Goto M, Matsuki H. A peculiar phase transition of plasmalogen bilayer membrane under high pressure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:11265-11268. [PMID: 19697955 DOI: 10.1021/la902503n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The bilayer phase transition of plasmalogen, monounsaturated plasmenylcholine 1-O-1'-(Z)-octadecenyl-2-oleoyl-sn-glycero-3-phosphocholine (Plg-SOPC), was examined by differential scanning calorimetry, high-pressure transmittance, and fluorescence techniques. The bilayer properties of Plg-SOPC such as the temperature-pressure phase diagram, the thermodynamic quantities of the transition, and the location of a fluorescent membrane probe in the bilayer, were compared with those of a similar phospholipid 1-stearoyl-2-oleoyl-phosphatidylcholine (SOPC). It turned out that a vinyl-ether bond in the sn-1 position of the glycerol backbone in the Plg-SOPC molecule produces a peculiar phase transition under high pressure and significantly affects the membrane properties.
Collapse
Affiliation(s)
- Agnieszka Broniec
- Department of Biophysics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland
| | | | | |
Collapse
|
29
|
Tada K, Miyazaki E, Goto M, Tamai N, Matsuki H, Kaneshina S. Barotropic and thermotropic bilayer phase behavior of positional isomers of unsaturated mixed-chain phosphatidylcholines. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:1056-63. [DOI: 10.1016/j.bbamem.2009.02.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Revised: 01/19/2009] [Accepted: 02/11/2009] [Indexed: 10/21/2022]
|
30
|
Takeda K, Sano Y, Ichikawa S, Hirata Y, Matsuki H, Kaneshina S. Effect of a Local Anesthetic Lidocaine Hydrochloride on the Bilayer Structure of Phospholipids. J Oleo Sci 2009; 58:369-77. [DOI: 10.5650/jos.58.369] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Koichi Takeda
- Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima
- Pharmaceutical Technology Institute, Otsuka Pharmaceutical Factory, Inc
| | - You Sano
- Department of Physics, Kansai Medical University
| | - Sosaku Ichikawa
- Graduate School of Life and Environmental Sciences, University of Tsukuba
| | - Yuuki Hirata
- Pharmaceutical Technology Institute, Otsuka Pharmaceutical Factory, Inc
| | - Hitoshi Matsuki
- Department of Life System, Institute of Technology and Science, The University of Tokushima
| | - Shoji Kaneshina
- Department of Life System, Institute of Technology and Science, The University of Tokushima
| |
Collapse
|
31
|
Potekhin S, Senin A, Abdurakhmanov N, Khusainova R. High pressure effect on the main transition from the ripple gel P′β phase to the liquid crystal (Lα) phase in dipalmitoylphosphatidylcholine. Microcalorimetric study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:2588-93. [DOI: 10.1016/j.bbamem.2008.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Revised: 07/31/2008] [Accepted: 08/04/2008] [Indexed: 11/30/2022]
|
32
|
Tada K, Saito K, Goto M, Tamai N, Matsuki H, Kaneshina S. High-pressure study on bilayer phase behavior of oleoylmyristoyl- and myristoyloleoyl-phosphatidylcholines. Biophys Chem 2008; 138:36-41. [PMID: 18804320 DOI: 10.1016/j.bpc.2008.08.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2008] [Revised: 08/26/2008] [Accepted: 08/26/2008] [Indexed: 10/21/2022]
Abstract
We investigated the thermotropic and barotropic bilayer phase behavior of 1-myristoyl-2-oleoyl-sn-glycero-3-phosphocholine (MOPC) and 1-oleoyl-2-myristoyl-sn-glycero-3-phosphocholine (OMPC) by means of the differential scanning calorimetry (DSC) and high-pressure light-transmittance technique. Water could be used as a solvent for measurements at high pressures because of the elevation of the transition temperatures above 0 degrees C by pressurization, whereas aqueous 50 wt.% ethylene glycol solution was used mainly for those at low pressures. Only one phase transition was observed in the DSC thermogram of the MOPC bilayer membrane as an endothermic peak, and also observed at high pressures as an abrupt change of the light-transmittance. The transition was assigned as a main transition between the lamellar gel (L(beta)) and liquid-crystalline (L(alpha)) phases on the basis of the values of enthalpy change (DeltaH) and slope of the transition temperature with respect to pressure (dT/dP). The DSC thermogram of the OMPC bilayer membrane similarly showed a single endothermic peak but two kinds of phase transitions were observed at different temperatures in the light-transmittance profile at high pressures. The extrapolation of the lower-temperature transition in the high-pressure range to an ambient pressure coincided with the transition observed in the DSC thermogram. This transition was identified as a transition between the lamellar crystal (L(c)) and L(alpha) (or L(beta)) phases from the DeltaH and dT/dP values. The higher-temperature transition, appearing only at high pressures, was identified as the L(beta)/L(alpha) transition considering the topological resemblance of its temperature-pressure phase diagram as that of the dioleoylphosphatidylcholine bilayer membrane. The phase diagram of the OMPC bilayer membrane demonstrated that the L(beta) phase cannot exist at pressures below ca. 190 MPa while it can exist stably in a finite temperature range at pressures above the pressure.
Collapse
Affiliation(s)
- Kaori Tada
- Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | | | | | | | | | | |
Collapse
|
33
|
Elegbede AI, Banerjee J, Hanson AJ, Tobwala S, Ganguli B, Wang R, Lu X, Srivastava DK, Mallik S. Mechanistic studies of the triggered release of liposomal contents by matrix metalloproteinase-9. J Am Chem Soc 2008; 130:10633-42. [PMID: 18642903 PMCID: PMC2644422 DOI: 10.1021/ja801548g] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Matrix metalloproteinases (MMPs) constitute a class of extracellular-matrix-degrading enzymes overexpressed in many cancers and contribute to the metastatic ability of the cancer cells. We have recently demonstrated that liposomal contents can be released when triggered by the enzyme MMP-9. Herein, we report the results of our mechanistic studies of the MMP-9-triggered release of liposomal contents. We synthesized peptides containing the cleavage site for MMP-9 and conjugated them with fatty acids to prepare the corresponding lipopeptides. By employing circular dichroism (CD) spectroscopy, we demonstrated that the lipopeptides, when incorporated into liposomes, are demixed in the lipid bilayers and generate triple-helical structures. MMP-9 cleaves the triple-helical peptides, leading to the release of the liposomal contents. Other MMPs, which cannot hydrolyze triple-helical peptides, fail to release the contents from the liposomes. We also observed that the rate and extent of release of the liposomal contents depend on the mismatch between the acyl chains of the synthesized lipopeptide and phospholipid components of the liposomes. CD spectroscopic studies imply that the observed differences in the release reflect the ability of the liposomal membrane to anneal the defects following the enzymatic cleavage of the liposome-incorporated lipopeptides.
Collapse
Affiliation(s)
- Adekunle I. Elegbede
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
| | - Jayati Banerjee
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
| | - Andrea J. Hanson
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
| | - Shakila Tobwala
- Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, North Dakota 58105
| | - Bratati Ganguli
- Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, North Dakota 58105
| | - Rongying Wang
- Proteomics Core Facility, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota 58202
| | - Xiaoning Lu
- Proteomics Core Facility, School of Medicine and Health Sciences, University of North Dakota, Grand Forks, North Dakota 58202
| | - D. K. Srivastava
- Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, North Dakota 58105
| | - Sanku Mallik
- Department of Pharmaceutical Sciences, North Dakota State University, Fargo, North Dakota 58105
| |
Collapse
|
34
|
Thermotropic and barotropic phase transitions of dilauroylphosphatidylcholine bilayer. Chem Phys Lipids 2008; 153:138-43. [DOI: 10.1016/j.chemphyslip.2008.03.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2007] [Revised: 02/15/2008] [Accepted: 03/03/2008] [Indexed: 11/17/2022]
|
35
|
Kusube M, Tamai N, Matsuki H, Kaneshina S. Pressure-induced phase transitions of lipid bilayers observed by fluorescent probes Prodan and Laurdan. Biophys Chem 2008; 117:199-206. [PMID: 15961215 DOI: 10.1016/j.bpc.2005.05.007] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Revised: 05/24/2005] [Accepted: 05/24/2005] [Indexed: 11/20/2022]
Abstract
The fluorescence spectra of 6-propionyl-2-(dimethylamino)naphthalene (Prodan) and 6-dodecanoyl-2-(dimethylamino)naphthalene (Laurdan) in bilayer membranes of 1,2-distearoylphosphatidylcholine (DSPC) were observed as a function of pressure at constant temperature. The emission spectra of Prodan and Laurdan varied with the pressure-induced states of bilayer membranes. The maximum emission wavelength (lambda(max)) of Prodan characteristic of the liquid crystalline (L(alpha)), lamellar gel (L(beta)') and pressure-induced interdigitated gel (L(beta)I) phases of the DSPC bilayer was 480, 440 and 500 nm, respectively. On the other hand, the lambda(max) of Laurdan characteristic of the L(alpha) and L(beta)' phases was 480 and 440 nm in a similar manner as Prodan probe. However, no change in the lambda(max) was observed in spite of the occurrence of the interdigitation of bilayer. Since the lambda(max) reflects the solvent property around the probe molecules, we could speculate about the location of fluorescent probe in the bilayer membranes. In the L(alpha) phase the same chromophore group of Prodan and Laurdan probes distributes around phosphate group of lipid (i.e., polar region). The transformation of bilayer into the L(beta)' phase causes the Prodan and Laurdan molecules to move into the glycerol backbone (i.e., less polar) region. In the ripple gel (P(beta)') phase, the emission spectrum of Prodan shows a broad peak at about 480 nm and a shoulder around 440 nm, which means that the Prodan molecules are widespread over the wide range from the glycerol backbone to the hydrophilic part of bilayer. The P(beta)'/L(beta)I phase transition causes the Prodan molecule to squeeze out from the glycerol backbone region and to move the hydrophilic region near the bilayer surface. Contrarily, the Laurdan molecule was not squeezed out from the glycerol backbone region because the long acyl chain of Laurdan serves as an anchor in the hydrophobic core of bilayer. The ratio of fluorescence intensity of Prodan at 480 nm to that at 440 nm, F(480)/F(440), is available to observation of bilayer phase transitions. The plot of F(480)/F(440) versus pressure seems to be useful for the recognition of bilayer phase transition, especially the bilayer interdigitation.
Collapse
Affiliation(s)
- Masataka Kusube
- Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, 2-1 Minamijosanjima, Tokushima 770-8506, Japan
| | | | | | | |
Collapse
|
36
|
Skanes ID, Stewart J, Keough KMW, Morrow MR. Effect of chain unsaturation on bilayer response to pressure. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2006; 74:051913. [PMID: 17279945 DOI: 10.1103/physreve.74.051913] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2006] [Indexed: 05/13/2023]
Abstract
Using wide-line deuterium NMR, the effects of pressure on saturated-chain orientational order and gel-to-liquid-crystal phase transition temperature were observed in bilayers of 16:0-18:1 PC-d31 (POPC-d31) and 16:0-18:2 PC-d31 (PLPC-d31). Spectra were recorded for a range of pressures at selected temperatures and for a range of temperatures at selected pressures up to 193 MPa. For 16:0-18:1 PC-d31, the main transition temperature increased by approximately 0.18 K/MPa, a rate that is similar to what is found for bilayers of disaturated PC's. For 16:0-18:2 PC-d31, the increase in transition temperature with pressure was slightly smaller at approximately 0.13 K/MPa. To investigate the isothermal response of chain orientational order to pressure, spectra for each lipid were obtained for three pressures (ambient, 55 MPa, and 110 MPa) near room temperature (approximately 25 degrees C) and for three pressures (ambient, 110 MPa, and 193 MPa) at higher temperature (approximately 40 degrees C). These temperatures were chosen such that the difference between the higher observation temperature and the main transition of 16:0-18:1 PC-d31 would be similar to the difference between the lower observation temperature and the main transition of 16:0-18:2 PC-d31. Application of a given pressure was found to raise the orientational order for all methylene groups on the saturated chain of a particular lipid by roughly similar amounts. For comparable pressure differences, the pressure-induced ordering of the 16:0-18:1 PC-d31 saturated chain at approximately 40 degrees C was greater than that of the corresponding chain in 16:0-18:2 PC- d31 at approximately 25 degrees C. These observations suggest that increasing levels of chain unsaturation may reduce the sensitivity of bilayer order to variations in pressure at corresponding temperatures relative to their ambient pressure transitions.
Collapse
Affiliation(s)
- I D Skanes
- Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, Newfoundland A1B 3X7, Canada
| | | | | | | |
Collapse
|
37
|
Matsuki H, Miyazaki E, Sakano F, Tamai N, Kaneshina S. Thermotropic and barotropic phase transitions in bilayer membranes of ether-linked phospholipids with varying alkyl chain lengths. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2006; 1768:479-89. [PMID: 17141731 DOI: 10.1016/j.bbamem.2006.10.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2006] [Revised: 09/07/2006] [Accepted: 10/16/2006] [Indexed: 11/22/2022]
Abstract
The bilayer phase transitions of a series of ether-linked phospholipids, 1,2-dialkylphosphatidylcholines containing linear saturated alkyl chain (C(n)=12, 14, 16 and 18), were observed by differential scanning calorimetry (DSC) under ambient pressure and light-transmittance measurements under high pressure. The thermodynamic quantities of the pre- and main-transitions for the ether-linked PC bilayer membranes were calculated and compared with those of a series of ester-linked PCs, 1,2-diacylphosphatidylcholines. The thermodynamic quantities of the main transition for the ether-linked PC bilayers showed distinct dependence on alkyl-chain length and were slightly different from those of the ester-linked PC bilayers. From the comparison of thermodynamic quantities for the main transition between both PC bilayers, we revealed that the attractive interaction in the gel phase for the ether-linked PC bilayers is weaker than that for the ester-linked PC bilayers. Regarding the pretransition, although changes in enthalpy and entropy for both PC bilayers were comparable to each other, the volume changes of the ether-linked PC bilayers roughly doubled those of the ester-linked PC bilayers. The larger volume change results from the smallest partial molar volume of the ether-linked PC molecule in the interdigitated gel phase. Further, we constructed the temperature-pressure phase diagrams for the ether-linked PC bilayers by using the phase-transition data. The region of the interdigitated gel phase in the phase diagrams was extended by applying pressure and by increasing the alkyl-chain length of the molecule. Comparing the phase diagrams with those for the ester-linked PC bilayers, it was proved that the phase behavior of the ester-linked PC bilayers under high temperature and pressure is almost equivalent to that of the ether-linked PC bilayers in the vicinity of ambient pressure.
Collapse
Affiliation(s)
- Hitoshi Matsuki
- Department of Life System, Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan.
| | | | | | | | | |
Collapse
|
38
|
Fa N, Ronkart S, Schanck A, Deleu M, Gaigneaux A, Goormaghtigh E, Mingeot-Leclercq MP. Effect of the antibiotic azithromycin on thermotropic behavior of DOPC or DPPC bilayers. Chem Phys Lipids 2006; 144:108-16. [PMID: 17007828 DOI: 10.1016/j.chemphyslip.2006.08.002] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Accepted: 08/08/2006] [Indexed: 11/18/2022]
Abstract
Azithromycin is a macrolide antibiotic known to bind to lipids and to affect endocytosis probably by interacting with lipid membranes [Tyteca, D., Schanck, A., Dufrene, Y.F., Deleu, M., Courtoy, P.J., Tulkens, P.M., Mingeot-Leclercq, M.P., 2003. The macrolide antibiotic azithromycin interacts with lipids and affects membrane organization and fluidity: studies on Langmuir-Blodgett monolayers, liposomes and J774 macrophages. J. Membr. Biol. 192, 203-215]. In this work, we investigate the effect of azithromycin on lipid model membranes made of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) or 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC). Thermal transitions of both lipids in contact with azithromycin are studied by (31)P NMR and DSC on multilamellar vesicles. Concerning the DPPC, azithromycin induces a suppression of the pretransition whereas a phase separation between the DOPC and the antibiotic is observed. For both lipids, the enthalpy associated with the phase transition is strongly decreased with azithromycin. Such effects may be due to an increase of the available space between hydrophobic chains after insertion of azithromycin in lipids. The findings provide a molecular insight of the phase merging of DPPC gel in DOPC fluid matrix induced by azithromycin [Berquand, A., Mingeot-Leclercq, M.P., Dufrene, Y.F., 2004. Real-time imaging of drug-membrane interactions by atomic force microscopy. Biochim. Biophys. Acta 1664, 198-205] and could help to a better understanding of azithromycin-cell interaction.
Collapse
Affiliation(s)
- N Fa
- Unité de Pharmacologie Cellulaire et Moléculaire, Université Catholique de Louvain, 73.70 Avenue E. Mounier 73, B-1200 Brussels, Belgium
| | | | | | | | | | | | | |
Collapse
|
39
|
Kusube M, Goto M, Tamai N, Matsuki H, Kaneshina S. Bilayer phase transitions of N-methylated dioleoylphosphatidylethanolamines under high pressure. Chem Phys Lipids 2006; 142:94-102. [PMID: 16620796 DOI: 10.1016/j.chemphyslip.2006.03.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2005] [Revised: 03/12/2006] [Accepted: 03/15/2006] [Indexed: 10/24/2022]
Abstract
The bilayer phase transitions of four kinds of unsaturated phospholipids with different-sized polar head groups, dioleoylphosphatidylethanolamine (DOPE), dioleoylphosphatidyl-N-methylethanolamine (DOMePE), dioleoylphosphatidyl-N,N-dimethylethanolamine (DOMe2PE) and dioleoylphosphatidylcholine (DOPC), were observed by means of differential scanning calorimetry (DSC) and high-pressure light-transmittance. DSC thermogram and light-transmittance curve for each phospholipid vesicle solution exhibited only one phase transition under ambient pressure, respectively. The light-transmittance of DOPC solution at pressure higher than 234 MPa abruptly increased stepwise at two temperatures, which corresponds to the appearance of stable subgel and lamellar gel phases under high pressure in addition to the liquid crystal phase. The constructed temperature (T)-pressure (p) phase diagrams were compared among these phospholipids. The phase-transition temperatures of the phospholipids decreased stepwise by N-methylation of the head group. The slops of the T-p phase boundary (dT/dp) of DOPE, DOMePE and DOMe2PE bilayers (0.127-0.145 K MPa-1) were found to be close to that of the transition from the lamellar crystal (or subgel; Lc) phase to the liquid crystal (Lalpha) phase for DOPC bilayer (0.131 K MPa-1). On the other hand, the dT/dp value of the main transition from the lamellar gel (Lbeta) phase to the Lalpha phase for DOPC bilayer (0.233 K MPa-1) was significantly different from that of the Lc/Lalpha transition, hence both curves intersected with each other at 234 MPa. The thermodynamic quantities associated with the phase transition of DOPE, DOMePE and DOMe2PE bilayers had also similar values to those for the Lc/Lalpha transition of DOPC bilayer. Taking into account of the values of transition temperature, dT/dp and thermodynamic quantities compared with the corresponding results of saturated phospholipids, we identified the phase transitions observed in the DOPE, DOMePE and DOMe2PE bilayers as the transition from the Lc phase to the Lalpha phase although they have been regarded as the main transition in the previous studies. The Lbeta phase is probably unstable for DOPE, DOMePE and DOMe2PE bilayers at all pressures, it exists as a metastable phase at pressures below 234 MPa while as a stable phase at pressures above 234 MPa in DOPC bilayer. The difference in phase stability among the phospholipid bilayers is originated from that in hydration structure of the polar head groups.
Collapse
Affiliation(s)
- Masataka Kusube
- Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, 2-1 Minamijosanjima-cho, Tokushima 770-8506, Japan
| | | | | | | | | |
Collapse
|
40
|
Matsuki H, Okuno H, Sakano F, Kusube M, Kaneshina S. Effect of deuterium oxide on the thermodynamic quantities associated with phase transitions of phosphatidylcholine bilayer membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2005; 1712:92-100. [PMID: 15869741 DOI: 10.1016/j.bbamem.2005.03.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2005] [Revised: 03/11/2005] [Accepted: 03/12/2005] [Indexed: 11/23/2022]
Abstract
The bilayer phase transitions of three kinds of phospholipids, dipalmitoylphosphatidylcholine (DPPC), distearoylphosphatidylcholine (DSPC) and dihexadecylphosphatidylcholine (DHPC), in deuterium oxide (D(2)O) and hydrogen oxide (H(2)O) were observed by differential scanning calorimetry (DSC) under ambient pressure and light-transmittance measurements under high pressure. The DSC measurements showed that the substitution of H(2)O by D(2)O affected the pretransition temperatures and the main-transition enthalpies of all PC bilayers. The temperature-pressure phase diagrams for these PC bilayer membranes in both solvents were constructed by use of the data of light-transmittance measurements. Regarding the main transition of all PC bilayer membranes, there was no appreciable difference between the transition temperatures in D(2)O and H(2)O under high pressure. On the other hand, the phase transitions among the gel phases including the pretransition were significantly affected by the solvent substitution. The thermodynamic quantities of phase transitions for the PC bilayer membranes were evaluated and the differences in thermodynamic properties by the water substitution were considered from the difference of interfacial-free energy per molecule in the bilayer in both solvents. It was proved that the substitution of H(2)O by D(2)O causes shrinkage of the molecular area of phospholipid at bilayer interface due to the difference in bond strength between deuterium and hydrogen bonds and produces the great influence on the bilayer phase with the smaller area. Further, the induction of bilayer interdigitation in D(2)O turned out to need higher pressures than in H(2)O.
Collapse
Affiliation(s)
- Hitoshi Matsuki
- Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, Japan.
| | | | | | | | | |
Collapse
|
41
|
Szabó Z, Budai M, Blaskó K, Gróf P. Molecular dynamics of the cyclic lipodepsipeptides' action on model membranes: effects of syringopeptin22A, syringomycin E, and syringotoxin studied by EPR technique. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2004; 1660:118-30. [PMID: 14757227 DOI: 10.1016/j.bbamem.2003.11.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Interaction of pore-forming toxins, syringopeptin22A (SP22A), syringomycin E (SRE) and syringotoxin (ST), with model membranes were investigated. Liposomes were prepared from saturated phospholipids (DPPC or DMPC) or from binary mixtures of DPPC with varying amount of DOPC or cholesterol. The effects of the three toxins on the molecular order and dynamics of the lipids were studied using electron paramagnetic resonance (EPR) techniques. SP22A was the most-, SRE less-, and ST the least effective to increase the ordering and to decrease the rotational correlation time of the lipid molecules. The effects were more pronounced: (a) on small unilamellar vesicles (SUVs) than on multilamellar vesicles (MUVs); (b) on pure DPPC than on DPPC-cholesterol or DPPC-DOPC mixtures. Fluidity changes, determined from EPR spectra at different concentrations of the toxin, suggested the shell structure of the lipid molecules in pore formation. EPR spectra observed at different depth of the hydrocarbon chain of the lipid molecules implied an active role of the lipid molecules in the architecture of the pores created in the presence of the three toxins. Temperature dependence of the fluidity of the SUVs treated with toxins has shown an abrupt and irreversible change in the molecular dynamics of the lipid molecules at a temperature close to the pretransition, depending on the toxin species and the lipid composition. Coalescence and aggregation of the SUVs were proposed as the origin of this irreversible change.
Collapse
Affiliation(s)
- Zsófia Szabó
- Faculty of Medicine, Institute of Biophysics and Radiation Biology, Semmelweis University, VIII Puskin u 9, POB 263, Budapest H-1444, Hungary
| | | | | | | |
Collapse
|
42
|
Hata T, Sakamoto T, Matsuki H, Kaneshina S. Partition coefficients of charged and uncharged local anesthetics into dipalmitoylphosphatidylcholine bilayer membrane: estimation from pH dependence on the depression of phase transition temperatures. Colloids Surf B Biointerfaces 2001; 22:77-84. [PMID: 11438243 DOI: 10.1016/s0927-7765(01)00160-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Effects of the local anesthetics, dibucaine, bupivacaine and lidocaine on the phase transition temperatures of dipalmitoylphosphatidylcholine (DPPC) bilayer membrane were studied by the optical method. We focus our attention on pH dependence of the depression of main transition and pretransition temperatures. The temperatures of both transitions of DPPC bilayer membrane were depressed by the addition of anesthetics; the higher the value of pH, the larger the depression of main transition temperature and/or pretransition temperature by anesthetics. By extending the colligative thermodynamic framework to the depression of main transition temperature by an anesthetic, we can estimate the differential partition coefficient, which is defined by the difference in partition coefficients of an anesthetic into the ripple gel and liquid crystal phases. The difference in partition coefficient between the lamellar and ripple gel phases can also be estimated from the depression of pretransition temperature. Since the differential partition coefficients include both contributions of the charged and uncharged anesthetics, we could estimate the partition coefficients of the charged and uncharged anesthetic into the membranes from the pH dependence of differential partition coefficients. The liquid crystalline membrane of DPPC bilayer was more receptive to the uncharged local anesthetics than the charged species. The partition coefficients of the charged and uncharged anesthetics into the liquid crystalline phase of DPPC bilayer membrane were 3540 and 249000 (for dibucaine), 1120 and 83900 (for bupivacaine), 256 and 11700 (for lidocaine), respectively. The transfer free energy of uncharged anesthetics from the aqueous phase to the liquid crystalline membrane was well correlated to the local anesthetic potency.
Collapse
Affiliation(s)
- T Hata
- Department of Biological Science and Technology, Faculty of Engineering, The University of Tokushima, Minamijosanjima, 770-8506, Tokushima, Japan
| | | | | | | |
Collapse
|
43
|
|
44
|
Mentré P, Hui Bon Hoa G. Effects of high hydrostatic pressures on living cells: a consequence of the properties of macromolecules and macromolecule-associated water. INTERNATIONAL REVIEW OF CYTOLOGY 2001; 201:1-84. [PMID: 11057830 DOI: 10.1016/s0074-7696(01)01001-4] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Sixty percent of the Earth's biomass is found in the sea, at depths greater than 1000 m, i.e., at hydrostatic pressures higher than 100 atm. Still more surprising is the fact that living cells can reversibly withstand pressure shifts of 1000 atm. One explanation lies in the properties of cellular water. Water forms a very thin film around macromolecules, with a heterogeneous structure that is an image of the heterogeneity of the macromolecular surface. The density of water in contact with macromolecules reflects the physical properties of their different domains. Therefore, any macromolecular shape variations involving the reorganization of water and concomitant density changes are sensitive to pressure (Le Chatelier's principle). Most of the pressure-induced changes to macromolecules are reversible up to 2000 atm. Both the effects of pressure shifts on living cells and the characteristics of pressure-adapted species are opening new perspectives on fundamental problems such as regulation and adaptation.
Collapse
Affiliation(s)
- P Mentré
- Station INRA 806, Institut de Biologie Physico-Chimique, Paris, France
| | | |
Collapse
|
45
|
Effect of unsaturated acyl chains on the thermotropic and barotropic phase transitions of phospholipid bilayer membranes. Chem Phys Lipids 1999. [DOI: 10.1016/s0009-3084(99)00050-x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|