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Kumari P, Kumari M, Kashyap HK. Counter-effects of Ethanol and Cholesterol on the Heterogeneous PSM–POPC Lipid Membrane: A Molecular Dynamics Simulation Study. J Phys Chem B 2019; 123:9616-9628. [DOI: 10.1021/acs.jpcb.9b07107] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Pratibha Kumari
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Monika Kumari
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Hemant K. Kashyap
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
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2
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Effect of temperature on surface tension and surface dilational rheology of type I collagen. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.05.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Elbialy NS, Mady MM. Ehrlich tumor inhibition using doxorubicin containing liposomes. Saudi Pharm J 2014; 23:182-7. [PMID: 25972739 PMCID: PMC4420998 DOI: 10.1016/j.jsps.2014.07.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Accepted: 07/05/2014] [Indexed: 10/27/2022] Open
Abstract
Ehrlich tumors were grown in female balb mice by subcutaneous injection of Ehrlich ascites carcinoma cells. Mice bearing Ehrlich tumor were injected with saline, DOX in solution or DOX encapsulated within liposomes prepared from DMPC/CHOL/DPPG/PEG-PE (100:100:60:4) in molar ratio. Cytotoxicity assay showed that the IC50 of liposomes containing DOX was greater than that DOX only. Tumor growth inhibition curves in terms of mean tumor size (cm(3)) were presented. All the DOX formulations were effective in preventing tumor growth compared to saline. Treatment with DOX loaded liposomes displayed a pronounced inhibition in tumor growth than treatment with DOX only. Histopathological examination of the entire tumor sections for the various groups revealed marked differences in cellular features accompanied by varying degrees in necrosis percentage ranging from 12% for saline treated mice to 70% for DOX loaded liposome treated mice. The proposed liposomal formulation can efficiently deliver the drug into the tumor cells by endocytosis (or passive diffusion) and lead to a high concentration of DOX in the tumor cells. The study showed that the formulation of liposomal doxorubicin improved the therapeutic index of DOX and had increased anti-tumor activity against Ehrlich tumor models.
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Affiliation(s)
- Nihal Saad Elbialy
- Biophysics Department, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - Mohsen Mahmoud Mady
- Biophysics Department, Faculty of Science, Cairo University, Giza 12613, Egypt ; King Saud University, College of Science, Department of Physics and Astronomy, Riyadh 11451, Saudi Arabia
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Monolayer and Brewster angle microscopy study of human serum albumin—Dipalmitoyl phosphatidyl choline mixtures at the air–water interface. Colloids Surf B Biointerfaces 2012; 92:64-73. [DOI: 10.1016/j.colsurfb.2011.11.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2011] [Revised: 11/10/2011] [Accepted: 11/10/2011] [Indexed: 12/24/2022]
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Eriksson ESE, Eriksson LA. The Influence of Cholesterol on the Properties and Permeability of Hypericin Derivatives in Lipid Membranes. J Chem Theory Comput 2011; 7:560-74. [DOI: 10.1021/ct100528u] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
| | - Leif A. Eriksson
- School of Chemistry, National University of Ireland—Galway, Galway, Ireland
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Zhao L, Feng SS, Kocherginsky N, Kostetski I. DSC and EPR investigations on effects of cholesterol component on molecular interactions between paclitaxel and phospholipid within lipid bilayer membrane. Int J Pharm 2007; 338:258-66. [PMID: 17337138 DOI: 10.1016/j.ijpharm.2007.01.045] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2006] [Revised: 01/18/2007] [Accepted: 01/27/2007] [Indexed: 10/23/2022]
Abstract
Differential scanning calorimetry (DSC) and electron paramagnetic resonance spectroscopy (EPR) were applied to investigate effects of cholesterol component on molecular interactions between paclitaxel, which is one of the best antineoplastic agents found from nature, and dipalmitoylphosphatidylcholine (DPPC) within lipid bilayer vesicles (liposomes), which could also be used as a model cell membrane. DSC analysis showed that incorporation of paclitaxel into the DPPC bilayer causes a reduction in the cooperativity of bilayer phase transition, leading to a looser and more flexible bilayer structure. Including cholesterol component in the DPPC/paclitaxel mixed bilayer can facilitate the molecular interaction between paclitaxel and lipid and make the tertiary system more stable. EPR analysis demonstrated that both of paclitaxel and cholesterol have fluidization effect on the DPPC bilayer membranes although cholesterol has more significant effect than paclitaxel does. The reduction kinetics of nitroxides by ascorbic acid showed that paclitaxel can inhibit the reaction by blocking the diffusion of either the ascorbic acid or nitroxide molecules since the reaction is tested to be a first order one. Cholesterol can remarkably increase the reduction reaction speed. This research may provide useful information for optimizing liposomal formulation of the drug as well as for understanding the pharmacology of paclitaxel.
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Affiliation(s)
- Lingyun Zhao
- Department of Chemical & Biomolecular Engineering, Faculty of Engineering, National University of Singapore, Block E5, 02-11, 4 Engineering Drive 4, Singapore 117576, Singapore
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Zhao L, Feng SS. Effects of cholesterol component on molecular interactions between paclitaxel and phospholipid within the lipid monolayer at the air–water interface. J Colloid Interface Sci 2006; 300:314-26. [PMID: 16603177 DOI: 10.1016/j.jcis.2006.03.035] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2005] [Revised: 03/03/2006] [Accepted: 03/14/2006] [Indexed: 11/30/2022]
Abstract
Cholesterol is a main component of the cell membrane and could have significant effects on drug-cell membrane interactions and thus the therapeutic efficacy of the drug. It also plays an important role in liposomal formulation of drugs for controlled and targeted delivery. In this research, Langmuir film technique, atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR) are employed for a systematic investigation on the effects of cholesterol component on the molecular interactions between a prototype antineoplastic drug (paclitaxel) and 1,2-dipalmitoyl-sn-glycerol-3-phosphocholine (DPPC) within the cell membrane by using the lipid monolayer at the air-water interface as a model of the lipid bilayer membrane and the biological cell membrane. Analysis of the measured surface pressure (pi) versus molecular area (a) isotherms of the mixed DPPC/paclitaxel/cholesterol monolayers at various molar ratios shows that DPPC, paclitaxel and cholesterol can form a non-ideal miscible system at the air-water interface. Cholesterol enhances the intermolecular forces between paclitaxel and DPPC, produces an area-condensing effect and thus makes the mixed monolayer more stable. Investigation of paclitaxel penetration into the mixed DPPC/cholesterol monolayer shows that the existence of cholesterol in the DPPC monolayer can considerably restrict the drug penetration into the monolayer, which may have clinical significance for diseases of high cholesterol. FTIR and AFM investigation on the mixed monolayer deposited on solid surface confirmed the obtained results.
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Affiliation(s)
- Lingyun Zhao
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescents, 119260 Singapore
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Ho D, Chang S, Montemagno CD. Fabrication of biofunctional nanomaterials via Escherichia coli OmpF protein air/water interface insertion/integration with copolymeric amphiphiles. NANOMEDICINE-NANOTECHNOLOGY BIOLOGY AND MEDICINE 2006; 2:103-12. [PMID: 17292122 DOI: 10.1016/j.nano.2005.12.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2005] [Accepted: 12/22/2005] [Indexed: 11/17/2022]
Abstract
Fabrication of next-generation biologically active materials will involve the integration of proteins with synthetic membrane materials toward a wide spectrum of applications in nanoscale medicine, including high-throughput drug testing, energy conversion for powering medical devices, and bio-cloaking films for mimicry of cellular membrane surfaces toward the enhancement of implant biocompatibility. We have used ABA triblock copolymer membranes (PMOXA-PDMS-PMOXA) of varied thicknesses as platform materials for Langmuir film-based functionalization with the OmpF pore protein from Escherichia coli by fabricating monolayers of copolymer amphiphile-protein complexes on the air/water interface. Here we demonstrate that the ability for protein insertion at the air/water interface during device fabrication is dependent upon the initial surface coverage with the copolymer as well as copolymer thickness. Methacrylate-terminated block copolymer structures that were 4 nm (4METH) and 8 nm (8METH) in length were used as the protein reconstitution matrix, whereas a 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) lipid (~4 nm thickness) was used as a comparison to demonstrate the effects of copolymer length on protein integration capabilities. Wilhemy surface pressure measurements (mN/m) revealed a greater protein insertion in the 4METH and POPC structures compared with the 8METH structure, indicating that shorter copolymer chains possess enhanced biomimicry of natural lipid-based membranes. In addition, comparisons between the isothermal characteristics of the 4METH, 8METH, and POPC membranes reveal that phase transitions of the 4METH resemble a blend of the 8METH and POPC materials, indicating that the 4METH chain may possess hybrid properties of both copolymers and lipids. Furthermore, we have shown that following the deposition of the amphiphilic materials on the air/water interface, the OmpF can be deposited directly on top of the amphiphiles (surface addition), thus effectively further enhancing protein insertion because of the buoying effects of the membranes. These characteristics of Langmuir-Blodgett-based fabrication of copolymer-biomolecule hybrids represent a synthesis strategy for next-generation biomedical materials.
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Affiliation(s)
- Dean Ho
- Department of Mechanical and Aerospace Engineering, Henry Samueli School of Engineering and Applied Science, University of California at Los Angeles, Los Angeles, California 90095, USA.
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Mosser G, Anglo A, Helary C, Bouligand Y, Giraud-Guille MM. Dense tissue-like collagen matrices formed in cell-free conditions. Matrix Biol 2005; 25:3-13. [PMID: 16253492 DOI: 10.1016/j.matbio.2005.09.002] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2005] [Revised: 09/12/2005] [Accepted: 09/12/2005] [Indexed: 11/17/2022]
Abstract
A new protocol was developed to produce dense organized collagen matrices hierarchically ordered on a large scale. It consists of a two stage process: (1) the organization of a collagen solution and (2) the stabilization of the organizations by a sol-gel transition that leads to the formation of collagen fibrils. This new protocol relies on the continuous injection of an acid-soluble collagen solution into glass microchambers. It leads to extended concentration gradients of collagen, ranging from 5 to 1000 mg/ml. The self-organization of collagen solutions into a wide array of spatial organizations was investigated. The final matrices obtained by this procedure varied in concentration, structure and density. Changes in the liquid state of the samples were followed by polarized light microscopy, and the final stabilized gel states obtained after fibrillogenesis were analyzed by both light and electron microscopy. Typical organizations extended homogeneously by up to three centimetres in one direction and several hundreds of micrometers in other directions. Fibrillogenesis of collagen solutions of high and low concentrations led to fibrils spatially arranged as has been described in bone and derm, respectively. Moreover, a relationship was revealed between the collagen concentration and the aggregation of and rotational angles between lateral fibrils. These results constitute a strong base from which to further develop highly enriched collagen matrices that could lead to substitutes that mimic connective tissues. The matrices thus obtained may also be good candidates for the study of the three-dimensional migration of cells.
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Affiliation(s)
- Gervaise Mosser
- Equipe Matériaux du Vivant, Laboratoire de Chimie de la Matière Condensée, UMR7574-CNRS-UPMC-EPHE, 12 rue Cuvier, 75005 Paris, France.
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Li M, Retter U, Lipkowski J. Kinetic studies of spreading DMPC vesicles at the air-solution interface using film pressure measurements. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:4356-61. [PMID: 16032847 DOI: 10.1021/la046796n] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
DMPC vesicles were injected into a 50 mM NaF solution in water, and the kinetics of a monolayer formation at the air-solution interface was investigated by measuring changes of the film pressure, pi, as a function of time. The studies were carried out in temperature range from 5 to 35 degrees C. The solutions were stirred in order to eliminate the mass transport limitations. Under these conditions, the monolayer formation was controlled by the surface processes only. At temperatures above the critical temperature Tc, compression isotherms were measured and used to convert the pi-t curves into the gamma-t plots, with gamma being the surface concentration of DMPC. These kinetic data indicate that the monolayer formation involves fast rupture of vesicles and formation of a constant number of disk-shaped monolayer islands at the air-solution interface that grow with a constant radial rate. At higher coverages, the growth is restricted by the availability of the monolayer-free surface area. At temperatures below Tc, the pi-t curves cannot be converted into the gamma-t plots. Here the kinetics can be discussed only qualitatively. The data indicate that the kinetics of the monolayer formation involves two steps. Initially, an expanded film is formed. At higher film pressures, the expanded film is slowly transformed into a liquid condensed state.
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Affiliation(s)
- Ming Li
- Department of Chemistry and Biochemistry, University of Guelph, N1G 2W1 ON, Canada
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Palaniyar N, Ikegami M, Korfhagen T, Whitsett J, McCormack FX. Domains of surfactant protein A that affect protein oligomerization, lipid structure and surface tension. Comp Biochem Physiol A Mol Integr Physiol 2001; 129:109-27. [PMID: 11369537 DOI: 10.1016/s1095-6433(01)00309-9] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Surfactant protein A (SP-A) is an abundant protein found in pulmonary surfactant which has been reported to have multiple functions. In this review, we focus on the structural importance of each domain of SP-A in the functions of protein oligomerization, the structural organization of lipids and the surface-active properties of surfactant, with an emphasis on ultrastructural analyses. The N-terminal domain of SP-A is required for disulfide-dependent protein oligomerization, and for binding and aggregation of phospholipids, but there is no evidence that this domain directly interacts with lipid membranes. The collagen-like domain is important for the stability and oligomerization of SP-A. It also contributes shape and dimension to the molecule, and appears to determine membrane spacing in lipid aggregates such as common myelin and tubular myelin. The neck domain of SP-A is primarily involved in protein trimerization, which is critical for many protein functions, but it does not appear to be directly involved in lipid interactions. The globular C-terminal domain of SP-A clearly plays a central role in lipid binding, and in more complex functions such as the formation and/or stabilization of curved membranes. In recent work, we have determined that the maintenance of low surface tension of surfactant in the presence of serum protein inhibitors requires cooperative interactions between the C-terminal and N-terminal domains of the molecule. This effect of SP-A requires a high degree of oligomeric assembly of the protein, and may be mediated by the activity of the protein to alter the form or physical state of surfactant lipid aggregates.
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Affiliation(s)
- N Palaniyar
- MRC Immunochemistry Unit, Department of Biochemistry, University of Oxford, South Parks Road, OX1 3QU, Oxford, UK.
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