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Liu X, Li M, Wang H, Yang L. Enhanced detection of acetamiprid via a gold nanoparticle-based colorimetric aptasensor integrated with a hybridization chain reaction. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:4301-4309. [PMID: 38887921 DOI: 10.1039/d4ay00685b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
This study presents a novel colorimetric aptasensor, which seamlessly integrates gold nanoparticles (AuNPs) with the amplification potential of the hybridization chain reaction (HCR) for enhanced detection of acetamiprid. The aptamer, hybridized with a partially complementary strand that is covalently linked to AuNPs, serves as the recognition element for acetamiprid. The free end sequence of the aptamer, distal from the AuNP surface, functions as the initiating strand for the HCR, triggering the amplification process. In the absence of acetamiprid, the HCR efficiently occurs, conferring robust salt tolerance to the AuNPs and maintaining their characteristic red coloration. However, in the presence of acetamiprid, the aptamer preferentially binds to its target, disrupting the double-stranded structure and leading to the dissociation of the aptamer from the AuNPs. This dissociation results in a decrease in the HCR product, subsequently diminishing the salt tolerance of AuNPs and triggering a colorimetric transition from red to gray. This integration enhances sensitivity to 3.14 nM. Additionally, carbon quantum dots (CQDs) transduce colorimetric signals to fluorescent ones, further boosting the sensitivity to 0.24 nM. The aptasensor exhibits excellent selectivity and robustness. Real-world testing on tomato, peach, and lettuce shows recoveries of 98.50% to 100.36% with low standard deviations, validating its utility for pesticide residue analysis and food safety. This study provides a powerful tool for rapid and accurate pesticide detection, crucial for food safety.
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Affiliation(s)
- Xingyi Liu
- Center for Bioengineering and Biotechnology, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Mingming Li
- Center for Bioengineering and Biotechnology, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Hao Wang
- Center for Bioengineering and Biotechnology, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
| | - Limin Yang
- Center for Bioengineering and Biotechnology, College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, P. R. China.
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2
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Yue L, Nakagawa Y, Ebara M. Design of Apoptotic Cell-Inspired Particles as a Blood Coagulation Test. Biomimetics (Basel) 2024; 9:367. [PMID: 38921247 PMCID: PMC11202003 DOI: 10.3390/biomimetics9060367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2024] [Revised: 06/12/2024] [Accepted: 06/12/2024] [Indexed: 06/27/2024] Open
Abstract
The blood coagulation test is an indispensable test for monitoring the blood coagulation and fibrinolysis functions. Currently, activated partial thromboplastin time (APTT) is the most widely used approach to coagulation testing. However, APTT reagents need to be optimized due to the fact that they are unstable, highly variable, and cannot be easily controlled. In this study, we created apoptotic cell-inspired methacryloyloxyethyl phosphorylserine (MPS) particles for blood coagulation as an alternative to conventional APTT reagents. Particle size could be controlled by changing the concentration of the polymer. The blood coagulation ability of particles was stable at different environmental temperatures. Moreover, the procoagulant activity could be enhanced by increasing the concentration to 0.06 mg/mL and reducing the size of the particles to around 900 nm. Fibrin clotted by particles showed no significant difference from that formed by APTT regent Actin FSL. We propose that MPS particles are a potential alternative to Actin FS for the application of blood coagulation tests.
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Affiliation(s)
- Liang Yue
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), Tsukuba 305-0044, Ibaraki, Japan
| | - Yasuhiro Nakagawa
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), Tsukuba 305-0044, Ibaraki, Japan
| | - Mitsuhiro Ebara
- Research Center for Macromolecules and Biomaterials, National Institute for Materials Science (NIMS), Tsukuba 305-0044, Ibaraki, Japan
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8577, Ibaraki, Japan
- Graduate School of Advanced Engineering, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
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3
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Wu Z, Zhou M, Tang X, Zeng J, Li Y, Sun Y, Huang J, Chen L, Wan M, Mao C. Carrier-Free Trehalose-Based Nanomotors Targeting Macrophages in Inflammatory Plaque for Treatment of Atherosclerosis. ACS NANO 2022; 16:3808-3820. [PMID: 35199998 DOI: 10.1021/acsnano.1c08391] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Inducing autophagy of macrophages to improve abnormal lipid metabolism is an important way to treat atherosclerosis (AS). Yet, the current application of the mammalian target of rapamycin (mTOR)-dependent autophagy inducers is limited by the side effects and lack of targeting and low biological availability. Herein, a kind of nitric oxide (NO)-driven carrier-free nanomotor based on the reaction between trehalose (Tr, one of the mTOR-independent autophagy inducers), L-arginine (Arg), and phosphatidylserine (PS) is reported. The developed nanomotors use NO as the driving force, which is generated from the reaction between Arg and excessive reactive oxygen species (ROS) and inducible nitric oxide synthase (iNOS) specifically presenting in the AS microenvironment. The high expression of ROS and iNOS in the AS site can be used as chemoattractants to induce chemotaxis behavior of the nanomotors to achieve the first-step targeting an AS plaque. Subsequently, the "eat me" signal sent by PS is exploited to precisely target to the macrophages in the AS plaque, realizing the plaque-macrophage-targeted effect by this step-by-step strategy. In vitro and in vivo results confirm that the introduction of the concept of carrier-free nanomotors has greatly improved the biological availability of trehalose (the dose can be reduced from 2.5 g kg-1 in previous reports to 0.01 g kg-1 in this work). Particularly, consumed ROS and the production of NO during the targeting process also play positive roles, in which the former regulates the M2 polarization of macrophages and the latter promotes the reconstruction of an endothelial barrier, which contributes to the multilink treatment of AS.
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Affiliation(s)
- Ziyu Wu
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
- Department of Vascular Surgery, Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
| | - Min Zhou
- Department of Vascular Surgery, Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
| | - Xueting Tang
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Jiaqi Zeng
- Department of Vascular Surgery, Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
| | - Yazhou Li
- Department of Vascular Surgery, Affiliated Drum Tower Hospital, Medical School of Nanjing University, Nanjing 210008, China
| | - Yuning Sun
- Pediatric Endocrinology and Genetic, Xinhua Hospital, Shanghai Institute for Pediatric Research, Shanghai Jiao Tong University, School of Medicine, Shanghai 200092, China
| | - Jia Huang
- Department of Cardiology, Zhongshan Hospital, Fudan University. Shanghai Institute of Cardiovascular Diseases, Shanghai 200032, China
| | - Lin Chen
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Mimi Wan
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Chun Mao
- National and Local Joint Engineering Research Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
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4
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Cochleate drug delivery systems: An approach to their characterization. Int J Pharm 2021; 610:121225. [PMID: 34710542 DOI: 10.1016/j.ijpharm.2021.121225] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2021] [Revised: 09/02/2021] [Accepted: 10/20/2021] [Indexed: 12/18/2022]
Abstract
Cochleate systems formed from phospholipids have very useful properties as drug delivery systems with sustained release capabilities, which are able to improve bioavailability and efficacy, reduce toxicity and increase the shelf-life of encapsulated molecules. These nanometric or micrometric structures are usually obtained after interaction of negatively charged liposomes with a positively charged bridging agent. Many different methods are now available to prepare cochleates and there are also numerous techniques that can be used to characterize them, some of which can be easily applied while others require more sophisticated equipment or analysis. The present review describes the important features of this drug delivery system; including their structural properties and potential applications, as well as a brief account of methods for their preparation and an extensive description of the techniques used for their characterization. This information could guide formulators in their choice of methods of characterization that would be best suited to their needs in terms of time, precision and technological difficulty.
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Mitra S, Ray D, Bhattacharya G, Gupta R, Sen D, Aswal VK, Ghosh SK. Probing the effect of a room temperature ionic liquid on phospholipid membranes in multilamellar vesicles. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2018; 48:119-129. [DOI: 10.1007/s00249-018-1339-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/16/2018] [Accepted: 11/19/2018] [Indexed: 01/12/2023]
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6
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Valentine ML, Cardenas AE, Elber R, Baiz CR. Physiological Calcium Concentrations Slow Dynamics at the Lipid-Water Interface. Biophys J 2018; 115:1541-1551. [PMID: 30269885 DOI: 10.1016/j.bpj.2018.08.044] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 08/20/2018] [Accepted: 08/27/2018] [Indexed: 02/07/2023] Open
Abstract
Phospholipids can interact strongly with ions at physiological concentrations, and these interactions can alter membrane properties. Here, we describe the effects of calcium ions on the dynamics in phospholipid membranes. We used a combination of time-resolved ultrafast two-dimensional infrared spectroscopy and molecular dynamics simulations. We found that millimolar Ca2+ concentrations lead to slower fluctuations in the local environment at the lipid-water interface of membranes with phosphatidylserine. The effect was only observed in bilayers containing anionic phosphatidylserine; membranes composed of only zwitterionic phosphatidylcholine did not experience a slowdown. Local water dynamics were measured using the ester groups as label-free probes and were found to be up to 50% slower with 2.5 mM Ca2+. Molecular dynamics simulations show that Ca2+ primarily binds to the carboxylate group of phosphatidylserines. These findings have implications for apoptotic and diseased cells in which phosphatidylserine is exposed to extracellular calcium and for the biophysical effects of divalent cations on lipid bilayers.
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Affiliation(s)
- Mason L Valentine
- Department of Chemistry, University of Texas at Austin, Austin, Texas
| | - Alfredo E Cardenas
- Department of Chemistry, University of Texas at Austin, Austin, Texas; Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, Texas
| | - Ron Elber
- Department of Chemistry, University of Texas at Austin, Austin, Texas; Institute for Computational Engineering and Sciences, University of Texas at Austin, Austin, Texas
| | - Carlos R Baiz
- Department of Chemistry, University of Texas at Austin, Austin, Texas.
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7
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Essaid D, Tfayli A, Maillard P, Sandt C, Rosilio V, Baillet-Guffroy A, Kasselouri A. Retinoblastoma membrane models and their interactions with porphyrin photosensitisers: An infrared microspectroscopy study. Chem Phys Lipids 2018; 215:34-45. [PMID: 30026072 DOI: 10.1016/j.chemphyslip.2018.07.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 07/02/2018] [Accepted: 07/11/2018] [Indexed: 12/16/2022]
Abstract
Fourier Transform Infrared (FTIR) microspectroscopy was used to highlight the interactions between two photosensitisers (PS) of different geometries, TPPmOH4 and a glycoconjugated analogous, TPPDegMan, and lipid bilayers modelling retinoblastoma cell membranes. Retinoblastoma is a rare disease occurring in young infants, for whom conservative treatments may present harmful side-effects. Photodynamic therapy (PDT) is expected to induce less side-effects, as the photosensitiser is only activated when the tumour is illuminated. Since efficiency of the treatment relies on photosensitiser penetration in cancer cells, bilayers with three lipid compositions - pure SOPC, SOPC/SOPE/SOPS/Chol (56:23:11:10) and SOPC/SOPE/SOPS/Chol/CL (42:32:9:8:6) - were used as plasma and mitochondria model membranes. FTIR spectra showed that the interaction of the PSs with the lipid bilayers impacted the lipid organization of the latter, causing significant spectral variations. Both studied photosensitisers inserted at the level of lipid hydrophobic chains, increasing chain fluidity and disorder. This was confirmed by surface pressure measurements. Photosensitisers - TPPmOH4 more than TPPDegMan - also interacted with the polar region of the bilayer, forming hydrogen bonds with phosphate groups that induced major shifts of phosphate absorption bands. This difference in PS interaction with moieties in the polar region was more pronounced with the models with complex lipid composition.
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Affiliation(s)
- Donia Essaid
- Lip(Sys)(2), Chimie Analytique Pharmaceutique, Univ. Paris-Sud, Université Paris-Saclay, F-92290 Châtenay-Malabry cedex, France
| | - Ali Tfayli
- Lip(Sys)(2), Chimie Analytique Pharmaceutique, Univ. Paris-Sud, Université Paris-Saclay, F-92290 Châtenay-Malabry cedex, France
| | - Philippe Maillard
- Department Chemistry, Modelling and Imaging for Biology (CMIB), Institut Curie, Research center, PSL Research University, Bât 110-112, Centre Universitaire, F-91405 Orsay cedex, France; CNRS, INSERM, UMR 9187-U 1196, Université Paris-Saclay, Univ. Paris-Sud, Bât 110-112, Centre Universitaire, F-91405 Orsay Cedex, France
| | - Christophe Sandt
- SMIS Beamline, Synchrotron SOLEIL, Orme des merisiers, BP48, 91192 Gif-sur-Yvette, France
| | - Véronique Rosilio
- Institut Galien Paris Sud, Univ Paris-Sud, CNRS, Université Paris-Saclay, F-92290 Châtenay-Malabry cedex, France
| | - Arlette Baillet-Guffroy
- Lip(Sys)(2), Chimie Analytique Pharmaceutique, Univ. Paris-Sud, Université Paris-Saclay, F-92290 Châtenay-Malabry cedex, France
| | - Athena Kasselouri
- Lip(Sys)(2), Chimie Analytique Pharmaceutique, Univ. Paris-Sud, Université Paris-Saclay, F-92290 Châtenay-Malabry cedex, France.
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8
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Ibsen KN, Ma H, Banerjee A, Tanner EEL, Nangia S, Mitragotri S. Mechanism of Antibacterial Activity of Choline-Based Ionic Liquids (CAGE). ACS Biomater Sci Eng 2018; 4:2370-2379. [PMID: 33435102 DOI: 10.1021/acsbiomaterials.8b00486] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The continued emergence of antibiotic-resistant organisms has severely depleted our arsenal of effective antimicrobials. Ionic liquids (ILs) show great promise as antibacterial agents but understanding the mechanism of attack on bacterial cells is key to ensuring that design of IL-based biocides impart maximum efficacy with minimal toxicity, while also avoiding the potential for the target organisms to become resistant. Here we report the antibacterial attributes of a set of choline and geranate (CAGE)-based ILs and identify the mechanism by which they interact with the Gram-negative cell wall of Escherichia coli. CAGE is envisaged as an antimicrobial agent to treat topical infections in skin. Our earlier work has shown that CAGE is highly effective across a breadth of bacterial, fungal, and viral species and is benign to human cells. This combination makes CAGE an ideal antimicrobial for human use. Four CAGE variants with varying ratios of choline and geranic acid were synthesized and tested for their antibacterial activity (1:4, 1:2, 1:1, and 2:1 choline:geranic acid). The minimum bactericidal concentration required to kill E. coli correlated with the geranic acid content. Using molecular dynamics (MD) simulations, we identified the mechanism of CAGE action on the E. coli membrane, namely that choline is attracted to the negatively charged cell membrane and consequently inserts geranic acid into the lipid bilayer. The disruption of the cell membrane was confirmed with propidium iodide staining via flow cytometry and scanning electron microscopy. Fourier Transform infrared spectroscopic analysis of treated cells showed an altered lipid profile similar to phase transition, indicating the disruption of the lipid bilayer conformation. E. coli cells repeatedly exposed to CAGE did not exhibit resistance. This study provides the fundamental mechanism of the action of choline-based ILs on Gram-negative bacteria and demonstrates the promise of CAGE as a powerful antimicrobial agent to treat infections.
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Affiliation(s)
- Kelly N Ibsen
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States.,School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Huilin Ma
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, United States
| | - Amrita Banerjee
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Eden E L Tanner
- School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Shikha Nangia
- Department of Biomedical and Chemical Engineering, Syracuse University, Syracuse, New York 13244, United States
| | - Samir Mitragotri
- School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
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9
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Pham VT, Nguyen TQ, Dao UPN, Nguyen TT. On the interaction between fluoxetine and lipid membranes: Effect of the lipid composition. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 191:50-61. [PMID: 28982068 DOI: 10.1016/j.saa.2017.09.050] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 09/16/2017] [Accepted: 09/17/2017] [Indexed: 05/27/2023]
Abstract
Molecular interaction between the antidepressant fluoxetine and lipid bilayers was investigated in order to provide insights into the drug's incorporation to lipid membranes. In particular, the effects of lipid's unsaturation degree and cholesterol content on the partitioning of fluoxetine into large unilamellar vesicles (LUVs) comprised of unsaturated 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and saturated 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) were evaluated using second derivative spectrophotometry and Attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR). It was found that fluoxetine partitioned to a greater extent into the liquid-crystalline DOPC LUVs than into the solid-gel DPPC LUVs. The lipid physical state dependence of drug partitioning was verified by increasing the temperature in which the partition coefficient of fluoxetine significantly increased upon the change of the lipid phase from solid-gel to liquid-crystalline. The incorporation of 28mol% cholesterol into the LUVs exerted a significant influence on the drug partitioning into both DOPC and DPPC LUVs. The ATR-FTIR study revealed that fluoxetine perturbed the conformation of DOPC more strongly than that of DPPC due to the cis-double bonds in the lipid acyl chains. Fluoxetine possibly bound to the carbonyl moiety of the lipids through the hydrogen bonding formation while displaced some water molecules surrounding the PO2- regions of the lipid head groups. Cholesterol, however, could lessen the interaction between fluoxetine and the carbonyl groups of both DOPC and DPPC LUVs. These findings provided a better understanding of the role of lipid structure and cholesterol on the interaction between fluoxetine and lipid membranes, shedding more light into the drug's therapeutic action.
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Affiliation(s)
- Vy T Pham
- School of Biotechnology, International University, Vietnam National University in HCMC, Block 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Trinh Q Nguyen
- School of Biotechnology, International University, Vietnam National University in HCMC, Block 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Uyen P N Dao
- School of Biotechnology, International University, Vietnam National University in HCMC, Block 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam
| | - Trang T Nguyen
- School of Biotechnology, International University, Vietnam National University in HCMC, Block 6, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Viet Nam.
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10
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Refai H, Hassan D, Abdelmonem R. Development and characterization of polymer-coated liposomes for vaginal delivery of sildenafil citrate. Drug Deliv 2017; 24:278-288. [PMID: 28165805 PMCID: PMC8241125 DOI: 10.1080/10717544.2016.1247925] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Vaginal administration of sildenafil citrate has shown recently to develop efficiently the uterine lining with subsequent successful embryo implantation following in vitro fertilization. The aim of the present study was to develop sildenafil-loaded liposomes coated with bioadhesive polymers for enhanced vaginal retention and improved drug permeation. Three liposomal formulae were prepared by thin-film method using different phospholipid:cholesterol ratios. The optimal liposomal formulation was coated with bioadhesive polymers (chitosan and HPMC). A marked increase in liposomal size and zeta potential was observed for all coated liposomal formulations. HPMC-coated liposomes showed the greater bioadhesion and higher entrapment efficiency than chitosan-coated formulae. The in vitro release studies showed prolonged release of sildenafil from coated liposomes as compared to uncoated liposomes and sildenafil solution. Ex vivo permeation study revealed the enhanced permeation of coated relative to uncoated liposomes. Chitosan-coated formula demonstrated highest drug permeation and was thus selected for further investigations. Transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FTIR) confirmed the successful coating of the liposomes by chitosan. Histopathological in vivo testing proved the efficacy of chitosan-coated liposomes to improve blood flow to the vaginal endometrium and to increase endometrial thickness. Chitosan-coated liposomes can be considered as potential novel drug delivery system intended for the vaginal administration of sildenafil, which would prolong system's retention at the vaginal site and enhance the permeation of sildenafil to uterine blood circulation.
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Affiliation(s)
- Hanan Refai
- a Department of Pharmaceutics and Industrial Pharmacy , Faculty of Pharmacy, Cairo University , Cairo , Egypt and.,b Department of Pharmaceutics and Industrial Pharmacy , Faculty of Pharmacy, Misr University for Science and Technology , 6th of October City , Egypt
| | - Doaa Hassan
- b Department of Pharmaceutics and Industrial Pharmacy , Faculty of Pharmacy, Misr University for Science and Technology , 6th of October City , Egypt
| | - Rehab Abdelmonem
- b Department of Pharmaceutics and Industrial Pharmacy , Faculty of Pharmacy, Misr University for Science and Technology , 6th of October City , Egypt
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11
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Pawar A, Bothiraja C, Shaikh K, Mali A. An insight into cochleates, a potential drug delivery system. RSC Adv 2015. [DOI: 10.1039/c5ra08550k] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cochleates are solid particulates made up of large continuous lipid bilayer sheets rolled up in a spiral structure with little or no internal aqueous phase. Cochleates improve the oral bioavailability and efficacy of the drugs by decreasing side effects.
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Affiliation(s)
- Atmaram Pawar
- Department of Pharmaceutics
- Bharati Vidyapeeth University
- Poona College of Pharmacy
- Pune 411038
- India
| | - C. Bothiraja
- Department of Pharmaceutics
- Bharati Vidyapeeth University
- Poona College of Pharmacy
- Pune 411038
- India
| | | | - Ashwin Mali
- Department of Pharmaceutics
- Bharati Vidyapeeth University
- Poona College of Pharmacy
- Pune 411038
- India
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12
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Madrid E, Horswell SL. Effect of Electric Field on Structure and Dynamics of Bilayers Formed From Anionic Phospholipids. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.01.035] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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13
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Kasian NA, Pashynska VA, Vashchenko OV, Krasnikova AO, Gömöry A, Kosevich MV, Lisetski LN. Probing of the combined effect of bisquaternary ammonium antimicrobial agents and acetylsalicylic acid on model phospholipid membranes: differential scanning calorimetry and mass spectrometry studies. MOLECULAR BIOSYSTEMS 2014; 10:3155-62. [PMID: 25233235 DOI: 10.1039/c4mb00420e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A model molecular biosystem of hydrated dipalmitoylphosphatidylcholine (DPPC) bilayers that mimics cell biomembranes is used to probe combined membranotropic effects of drugs by instrumental techniques of molecular biophysics. Differential scanning calorimetry reveals that doping of the DPPC model membrane with individual bisquaternary ammonium compounds (BQAC) decamethoxinum, ethonium, thionium and acetylsalicylic acid (ASA) leads to lowering of the membrane melting temperature (Tm) pointing to membrane fluidization. Combined application of the basic BQAC and acidic ASA causes an opposite effect on Tm (increase), corresponding to the membrane densification. Thus, modulation of the membranotropic effects upon combined use of the drugs studied can be revealed at the level of model membranes. Formation of noncovalent supramolecular complexes of the individual BQACs and ASA with DPPC molecules, which may be involved in the mechanism of the drug-membrane interaction at the molecular level, is demonstrated by electrospray ionization (ESI) mass spectrometry. In the ternary (DPPC + ASA + BQAC) model systems, the stable complexes of the BQAC dication with the ASA anion, which may be responsible for modulation of the membranotropic effects of the drugs, were recorded by ESI mass spectrometry. The proposed approach can be further developed for preliminary evaluation of the combined effects of the drugs at the level of model lipid membranes prior to tests on living organisms.
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Affiliation(s)
- N A Kasian
- Institute for Scintillation Materials of the National Academy of Sciences of Ukraine, 60, Lenin ave., 61001 Kharkov, Ukraine.
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14
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Martins VHG, Rodrigues MR, Mascarenhas LD, de Azambuja CRL, Londoño JL, de Lima VR. The effect of furazolidone on the physico-chemical properties of dimyristoylphosphatidylcholine bilayers: Relevance to anti-leishmanial therapy. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.12.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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15
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Marques AV, Marengo Trindade P, Marques S, Brum T, Harte E, Rodrigues MO, D’Oca MGM, da Silva PA, Pohlmann AR, Alves ID, de Lima VR. Isoniazid interaction with phosphatidylcholine-based membranes. J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2013.08.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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16
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Chen C, Tripp CP. An infrared spectroscopic based method to measure membrane permeance in liposomes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2008; 1778:2266-72. [DOI: 10.1016/j.bbamem.2008.05.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Revised: 05/22/2008] [Accepted: 05/22/2008] [Indexed: 10/22/2022]
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17
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18
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Interaction between vitamin D2 and magnesium in liposomes: Differential scanning calorimetry and FTIR spectroscopy studies. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.11.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Seu KJ, Cambrea LR, Everly RM, Hovis JS. Influence of lipid chemistry on membrane fluidity: tail and headgroup interactions. Biophys J 2006; 91:3727-35. [PMID: 16950848 PMCID: PMC1630490 DOI: 10.1529/biophysj.106.084590] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Membrane fluidity plays an important role in cell function and may, in many instances, be adjusted to facilitate specific cellular processes. To understand better the effect that lipid chemistry has on membrane fluidity the inclusion of three different lipids into egg phosphatidylcholine (eggPC) bilayers has been examined; the three lipids are egg phosphatidylethanolamine ((eggPE) made by transphosphatidylation of eggPC in the presence of ethanolamine), lyso-phosphatidylcholine (LPC), and lyso-phosphatidylethanolamine (LPE). The fluidity of the membranes was determined using fluorescence recovery after photobleaching and the intermolecular interactions were examined using attenuated total reflection Fourier transform infrared spectroscopy. It was observed that both headgroup and tail chemistry can significantly modulate lipid diffusion. Specifically, the inclusion of LPC and eggPE significantly altered the lipid diffusion, increased and decreased, respectively, whereas the inclusion of LPE had an intermediate effect, a slight decrease in diffusion. Strong evidence for the formation of hydrogen-bonds between the phosphate group and the amine group in eggPE and LPE was observed with infrared spectroscopy. The biological implications of these results are discussed.
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Affiliation(s)
- Kalani J Seu
- Department of Chemistry, Purdue University, West Lafayette, Indiana, USA
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20
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Raha K, Merz KM. Large-Scale Validation of a Quantum Mechanics Based Scoring Function: Predicting the Binding Affinity and the Binding Mode of a Diverse Set of Protein−Ligand Complexes. J Med Chem 2005; 48:4558-75. [PMID: 15999994 DOI: 10.1021/jm048973n] [Citation(s) in RCA: 155] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Computational methods to calculate binding affinity in protein-ligand interaction are of immense interest because of obvious practical applications in structure-based drug design. Scoring functions attempt to calculate the variation in binding affinity of ligands-inhibitors bound to protein targets at various levels of theory. In this study we use semiempirical quantum mechanics to design a scoring function that can calculate the electrostatic interactions and solvation free energy expected during complexation. This physically based approach has the ability to capture binding affinity trends in a diverse range of protein-ligand complexes. We also show the predictive power of this scoring function within protein targets and its ability to score ligand poses docked to a protein target. We also demonstrate the ability of this scoring function to discriminate between native and decoy poses and highlight the crucial role played by electrostatic interactions in molecular recognition. Finally we compare the performance of our scoring function with other available scoring functions in the literature.
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Affiliation(s)
- Kaushik Raha
- Department of Chemistry, 104 Chemistry Building, The Pennsylvania State University, University Park, 16802, USA
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21
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Bach D, Borochov N, Wachtel E. Phase separation of cholesterol from phosphatidylserine-cholesterol mixtures in the presence of the local anesthetic tetracaine. Chem Phys Lipids 2005; 130:99-107. [PMID: 15172826 DOI: 10.1016/j.chemphyslip.2004.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2003] [Revised: 01/29/2004] [Accepted: 02/02/2004] [Indexed: 11/20/2022]
Abstract
Addition of the local anesthetic tetracaine (TTC) to multilamellar dispersions of natural phosphatidylserine (PS) causes changes in the thermotropic properties of the membrane, which can be detected by differential scanning calorimetry, and in the structure of the membrane as detected by X-ray diffraction. At molar ratio [PS]/ [TTC] approximately 8.5, the melting temperature of the phospholipid shifts downwards by approximately 2.5 degrees C. The melting endotherm is broadened; however, there is little change in the enthalpy of melting. In ternary mixtures (PS-TTC-cholesterol), the thermotropic changes are enhanced. At [PS]/ [TTC] approximately 13, the onset of phase separation of cholesterol crystals from PS in the liquid crystalline state occurs at molar fraction cholesterol (Xchol) approximately 0.28, marginally smaller than that found in the absence of the anesthetic.
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Affiliation(s)
- Diana Bach
- Department of Biological Chemistry, Weizmann Institute of Science, Rehovot, Israel.
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22
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Toyran N, Severcan F. Competitive effect of vitamin D2 and Ca2+ on phospholipid model membranes: an FTIR study. Chem Phys Lipids 2003; 123:165-76. [PMID: 12691849 DOI: 10.1016/s0009-3084(02)00194-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The interaction of Ca(2+), with dipalmitoyl phosphatidylcholine (DPPC) model membranes was studied in the presence and absence of vitamin D(2) by using Fourier transform infrared spectroscopy. Addition of vitamin D(2) and/or Ca(2+) into pure DPPC liposomes shifts the phase transition to higher temperature, orders and decreases the dynamics of the acyl chains in both phases and does not induce hydrogen bond formation in the interfacial region. Moreover, the dynamics of the head group of the phospholipid decreases in both phases. The addition of vitamin D(2) into DPPC liposomes containing Ca(2+), decreases the effect of Ca(2+) at all the functional groups under investigation. Similarly, the effect of vitamin D(2) also decreases in the presence of Ca(2+). This behavior is dominant at high Ca(2+) concentrations. Our results show how simultaneous presence of vitamin D(2) and Ca(2+) alter the behavior of each other, which is reflected as a decrease in the interactions between the ions and vitamin D(2) within the membrane.
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Affiliation(s)
- Neslihan Toyran
- Department of Biology, Middle East Technical University, 06531 Ankara, Turkey
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23
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Rujoi M, Borchman D, DuPré DB, Yappert MC. Interactions of Ca(2+) with sphingomyelin and dihydrosphingomyelin. Biophys J 2002; 82:3096-104. [PMID: 12023233 PMCID: PMC1302098 DOI: 10.1016/s0006-3495(02)75651-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The changes induced by Ca(2+) on human lens sphingolipids, sphingomyelin (SM), and dihydrosphingomyelin were investigated by infrared spectroscopy. Ca(2+)-concentration-dependent studies of the head group region revealed that, for both sphingolipids, Ca(2+) partially dehydrates some of the phosphate groups and binds to others. Ca(2+) affects the interface of each sphingolipid differently. In SM, Ca(2+) shifts the amide I' band to frequencies lower than those in dehydrated samples of SM alone. This could be attributed to the direct binding of Ca(2+) to carbonyl groups and/or strong tightening of interlipid H-bonds to levels beyond those in dehydrated samples of SM only. In contrast, Ca(2+) induces relatively minor dehydration around the amide groups of dihydrosphingomyelin and a slight enhancement of direct lipid-lipid interactions. Temperature-dependent studies reveal that 0.2 M Ca(2+) increases the transition temperature T(m) from 31.6 +/- 1.0 degrees C to 35.7 +/- 1.1 degrees C for SM and from 45.5 +/- 1.1 degrees C to 48.2 +/- 1.0 degrees C for dihydrosphingomyelin. Binding of Ca(2+) to some phosphate groups remains above T(m). The strength of the interaction is, however, weaker. This allows for the partial rehydration of these moieties. Similarly, above T(m), Ca(2+)-lipid and/or direct inter-lipid interactions are weakened and lead to the rehydration of amide groups.
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Affiliation(s)
- Madalina Rujoi
- Department of Chemistry, University of Louisville, Louisville, Kentucky 40208, USA
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25
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Dicko A, Bourque H, Pézolet M. Study by infrared spectroscopy of the conformation of dipalmitoylphosphatidylglycerol monolayers at the air–water interface and transferred on solid substrates. Chem Phys Lipids 1998. [DOI: 10.1016/s0009-3084(98)00084-x] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Structure of the phosphatidylglycerol-photosystem II complex studied by FT-IR spectroscopy. Mg(II) effect on the polar head group of phosphatidylglycerol. J Mol Struct 1997. [DOI: 10.1016/s0022-2860(96)09600-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Abstract
The interactions of cytochrome c (cyt c) with cardiolipin, a major anionic phospholipid of mitochondrial membranes, and dioleoylphosphatidylglycerol (DOPG), have been compared by infrared (IR) spectroscopy. The Fourier self-deconvoluted IR spectra of the lipid carbonyl groups indicate that both cyt c3+ and cyt c2+ perturb and/or dehydrate the interfacial region of cardiolipin bilayers. Only a slight perturbation, if any, is observed in the interfacial region of DOPG bilayers. However, the phosphate head region of DOPG is perturbed by cyt c3+, which was not detected in cardiolipin. The results suggest that cytochrome c in both redox states can partially penetrate into cardiolipin but not into DOPG bilayers. The interaction of cyt c with cardiolipin and DOPG is mainly hydrophobic and electrostatic, respectively. The Fourier self-deconvoluted IR spectra in the amide I region reveal that ca. 10% of the cyt c3+ alpha-helix unfolds to random coil upon binding to cardiolipin bilayers. However, only very slight secondary structural changes, if any, were detected when cyt c3+ binds to DOPG bilayers.
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Affiliation(s)
- S Choi
- Department of Chemistry and Biochemistry, Middlebury College, VT 05753, USA
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28
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Gómez-Gutiérrez J, Rodríguez-Crespo I, Peterson DL, Gavilanes F. Reconstitution of hepatitis B surface antigen proteins into phospholipid vesicles. BIOCHIMICA ET BIOPHYSICA ACTA 1994; 1192:45-52. [PMID: 8204649 DOI: 10.1016/0005-2736(94)90141-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Hepatitis B surface antigen (HBsAg), devoid of 75% of its total lipids has been reconstituted with several phospholipids by the detergent dialysis method, using the non-ionic detergent beta-D-octyl glucoside. Upon reconstitution with both neutral and acidic phospholipids, HBsAg particles had the same morphology and, as indicated by trypsin hydrolysis, the topology of the surface proteins was maintained. However, only negatively charged phospholipids were able to completely revert the conformational changes which had been induced by removal of the lipids. The helical content, as indicated by CD techniques, and the antigenic activity, as measured by binding to polyclonal antibodies, of HBsAg reconstituted with acidic phospholipids were practically identical to those of the native antigen. Cholesterol had no effect on the antigenic activity recovered by reconstitution with any of the phospholipids.
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Affiliation(s)
- J Gómez-Gutiérrez
- Departamento de Bioquímica y Biología Molecular, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
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29
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Flach CR, Mendelsohn R. A new infrared spectroscopoic marker for cochleate phases in phosphatidylserine-containing model membranes. Biophys J 1993; 64:1113-21. [PMID: 8494975 PMCID: PMC1262429 DOI: 10.1016/s0006-3495(93)81477-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Fourier transform-infrared (IR) spectroscopic and electron microscopic studies are reported for 1,2-dimyristoylphosphatidylserine (DMPS) and for DMPS/1,2-dimyristoylphosphatidylcholine mixtures in the presence and absence of Ca2+ ion. The frequency of the methyl symmetric deformation mode near 1,378 cm-1, previously assumed insensitive to changes in lipid morphology, has been found to respond to cochleate phase formation by undergoing an approximately 8 cm-1 increase. The new IR spectroscopic marker at 1,386 cm-1 has been used to identify and verify structures suggested from the phase diagram of J. R. Silvius and J. Gagné (1984. Biochemistry. 23:3241-3247) for this system. In addition, the ability of Mg2+ ion to induce cochleate formation has been demonstrated. Higher Mg2+ than Ca2+ levels are required for this process. Finally, IR spectroscopy has been used to monitor dehydration of the lipid surface through changes in the asymmetric PO2- stretching mode. Dehydration precedes cochleate phase formation (i.e., occurs at a lower Ca2+/phosphatidylserine level).
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Affiliation(s)
- C R Flach
- Department of Chemistry, Newark College of Arts and Science, Rutgers University, New Jersey 07102
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