1
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Kano S, Takahashi H. Cholesterol's inhibition effect on entering of chlorzoxazone into phosphatidylethanolamine bilayer: Relevance to cytochrome P450 drug metabolism at endoplasmic reticulum membranes. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2022; 1864:183954. [PMID: 35523303 DOI: 10.1016/j.bbamem.2022.183954] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/18/2022] [Accepted: 04/29/2022] [Indexed: 06/14/2023]
Abstract
Many drugs are metabolized by cytochrome P450 (CYP) in the endoplasmic reticulum (ER) membrane. Recent studies have shown that CYP-substrate drugs reach the CYP active site after entering the lipid hydrophobic part of the ER membrane. To clarify the role of cholesterol (Chol) in the CYP-related drug metabolic process, we investigated the lipid bilayer entry of CYP-substrate drugs using a model membrane system as follows. The model membrane system comprised palmitoyl-oleoyl-phosphatidylethanolamine (POPE) and Chol. Phosphatidylethanolamine is the second major phospholipid component of ER membranes. Chlorzoxazone (CZX) was used as the CYP-substrate drug. Calorimetric measurements showed that the addition of CZX to POPE bilayers decreased the gel-liquid crystal phase transition temperature; X-ray diffraction indicated that CZX distributes into the liquid crystal phase bilayers but not practically the gel phase POPE bilayers. In the presence of Chol, dialysis and X-ray structural analyses showed that Chol inhibited CZX entry into the bilayer with an increase in Chol concentration. The Chol concentration in the ER membrane (5-10 mol%) is much lower than that in the plasma membrane (approximately 30 mol%). This fact may allow CYP-substrate drugs to enter the hydrophobic portion of the ER membrane more easily than other organelle membranes, yielding efficient drug metabolism.
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Affiliation(s)
- Shosei Kano
- Division of Pure and Applied Science, Graduate School of Science and Technology, Gunma University, Maebashi, Gunma 371-8510, Japan
| | - Hiroshi Takahashi
- Division of Pure and Applied Science, Graduate School of Science and Technology, Gunma University, Maebashi, Gunma 371-8510, Japan.
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2
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Siani P, Donadoni E, Ferraro L, Re F, Di Valentin C. Molecular dynamics simulations of doxorubicin in sphingomyelin-based lipid membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2021; 1864:183763. [PMID: 34506799 DOI: 10.1016/j.bbamem.2021.183763] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 07/22/2021] [Accepted: 08/26/2021] [Indexed: 12/14/2022]
Abstract
Doxorubicin (DOX) is one of the most efficient antitumor drugs employed in numerous cancer therapies. Its incorporation into lipid-based nanocarriers, such as liposomes, improves the drug targeting into tumor cells and reduces drug side effects. The carriers' lipid composition is expected to affect the interactions of DOX and its partitioning into liposomal membranes. To get a rational insight into this aspect and determine promising lipid compositions, we use numerical simulations, which provide unique information on DOX-membrane interactions at the atomic level of resolution. In particular, we combine classical molecular dynamics simulations and free energy calculations to elucidate the mechanism of penetration of a protonated Doxorubicin molecule (DOX+) into potential liposome membranes, here modeled as lipid bilayers based on mixtures of phosphatidylcholine (PC), sphingomyelin (SM) and cholesterol lipid molecules, of different compositions and lipid phases. Moreover, we analyze DOX+ partitioning into relevant regions of SM-based lipid bilayer systems using a combination of free energy methods. Our results show that DOX+ penetration and partitioning are facilitated into less tightly packed SM-based membranes and are dependent on lipid composition. This work paves the way to further investigations of optimal formulations for lipid-based carriers, such as those associated with pH-responsive membranes.
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Affiliation(s)
- Paulo Siani
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Edoardo Donadoni
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Lorenzo Ferraro
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy
| | - Francesca Re
- School of Medicine and Surgery, University of Milano-Bicocca, via Raoul Follereau 3, Vedano al Lambro, MB 20854, Italy; BioNanoMedicine Center NANOMIB, University of Milano-Bicocca, Italy
| | - Cristiana Di Valentin
- Department of Materials Science, University of Milano-Bicocca, via R. Cozzi 55, 20125 Milano, Italy; BioNanoMedicine Center NANOMIB, University of Milano-Bicocca, Italy.
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3
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Materon EM, Nascimento GF, Shimizu FM, Câmara AS, Sandrino B, Faria RC, Oliveira ON. Role of sphingomyelin on the interaction of the anticancer drug gemcitabine hydrochloride with cell membrane models. Colloids Surf B Biointerfaces 2020; 196:111357. [DOI: 10.1016/j.colsurfb.2020.111357] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 09/10/2020] [Accepted: 09/11/2020] [Indexed: 12/17/2022]
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4
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Novikova N, Kovalchuk M, Konovalov O, Stepina N, Rogachev A, Belov A, Maksimenko O, Tarasov V, Gelperina S, Kreuter J, Yakunin S. X-Ray Reflectivity and Diffraction Studies of Doxorubicin Binding to Model Lipid Membranes. BIONANOSCIENCE 2020. [DOI: 10.1007/s12668-020-00742-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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5
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Eleftheriou K, Kaminari A, Panagiotaki KN, Sideratou Z, Zachariadis M, Anastassopoulou J, Tsiourvas D. A combination drug delivery system employing thermosensitive liposomes for enhanced cell penetration and improved in vitro efficacy. Int J Pharm 2020; 574:118912. [PMID: 31809858 DOI: 10.1016/j.ijpharm.2019.118912] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 11/15/2019] [Accepted: 11/27/2019] [Indexed: 02/06/2023]
Abstract
Drug-loaded thermosensitive liposomes are investigated as drug delivery systems in combination with local mild hyperthermia therapy due to their capacity to release their cargo at a specific temperature range (40-42 °C). Additional benefit can be achieved by the development of such systems that combine two different anticancer drugs, have cell penetration properties and, when heated, release their drug payload in a controlled fashion. To this end, liposomes were developed incorporating at low concentration (5 mol%) a number of monoalkylether phosphatidylcholine lipids, encompassing the platelet activating factor, PAF, and its analogues that induce thermoresponsiveness and have anticancer biological activity. These thermoresponsive liposomes were efficiently (>90%) loaded with doxorubicin (DOX), and their thermal properties, stability and drug release were investigated both at 37 ◦C and at elevated temperatures. In vitro studies of the most advantageous liposomal formulation containing the methylated PAF derivative (methyl-PAF, edelfosine), an established antitumor agent, were performed on human prostate cancer cell lines. This system exhibits controlled release of DOX at 40-42 °C, enhanced cell uptake due to the presence of methyl-PAF, and improved cell viability inhibition due to the combined action of both medications.
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Affiliation(s)
- Kleopatra Eleftheriou
- Institute of Nanoscience and Nanotechnology, NCSR ''Demokritos", 15310 Aghia Paraskevi, Greece
| | - Archontia Kaminari
- Institute of Nanoscience and Nanotechnology, NCSR ''Demokritos", 15310 Aghia Paraskevi, Greece
| | - Katerina N Panagiotaki
- Institute of Nanoscience and Nanotechnology, NCSR ''Demokritos", 15310 Aghia Paraskevi, Greece
| | - Zili Sideratou
- Institute of Nanoscience and Nanotechnology, NCSR ''Demokritos", 15310 Aghia Paraskevi, Greece
| | - Michael Zachariadis
- Institute of Biosciences and Applications, NCSR ''Demokritos", 15310 Aghia Paraskevi, Greece
| | - Jane Anastassopoulou
- Radiation Chemistry and Biospectroscopy, School of Chemical Engineering, National Technical University of Athens, Athens, Greece
| | - Dimitris Tsiourvas
- Institute of Nanoscience and Nanotechnology, NCSR ''Demokritos", 15310 Aghia Paraskevi, Greece.
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6
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Fan CH, Lee YH, Ho YJ, Wang CH, Kang ST, Yeh CK. Macrophages as Drug Delivery Carriers for Acoustic Phase-Change Droplets. ULTRASOUND IN MEDICINE & BIOLOGY 2018; 44:1468-1481. [PMID: 29685589 DOI: 10.1016/j.ultrasmedbio.2018.03.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Revised: 03/06/2018] [Accepted: 03/14/2018] [Indexed: 05/19/2023]
Abstract
The major challenges in treating malignant tumors are transport of therapeutic agents to hypoxic regions and real-time assessment of successful drug release via medical imaging modalities. In this study, we propose the use of macrophages (RAW 264.7 cells) as carriers of drug-loaded phase-change droplets to penetrate ischemic or hypoxic regions within tumors. The droplets consist of perfluoropentane, lipid and the chemotherapeutic drug doxorubicin (DOX, DOX-droplets). The efficiency of DOX-droplet uptake, migration mobility and viability of DOX-droplet-loaded macrophages (DLMs) were measured using a transmembrane cell migration assay, the alamarBlue assay and flow cytometric analysis, respectively. Our results indicate the feasibility of utilizing macrophages as DOX-droplet carriers (DOX payload of DOX-droplets: 459.3 ± 35.8 µg/mL, efficiency of cell uptake DOX-droplets: 88.8 ± 3.5%). The migration mobility (total number of migrated microphages) of DLMs decreased to 32.3% compared with that of healthy macrophages, but the DLMs provided contrast-enhanced ultrasound imaging (1.7-fold enhancement) and anti-tumor effect (70.9% cell viability) after acoustic droplet vaporization, suggesting the potential theranostic applications of DLMs. Future work will assess the tumor penetration ability of DLMs, mechanical effect of droplet vaporization on in vivo anti-tumor therapy and the release of the carried drug by ultrasound-triggered vaporization.
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Affiliation(s)
- Ching-Hsiang Fan
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
| | - Ya-Hsuan Lee
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
| | - Yi-Ju Ho
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
| | - Chung-Hsin Wang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
| | - Shih-Tsung Kang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan
| | - Chih-Kuang Yeh
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu, Taiwan.
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7
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Alves AC, Nunes C, Lima J, Reis S. Daunorubicin and doxorubicin molecular interplay with 2D membrane models. Colloids Surf B Biointerfaces 2017; 160:610-618. [DOI: 10.1016/j.colsurfb.2017.09.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 09/22/2017] [Accepted: 09/28/2017] [Indexed: 10/18/2022]
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8
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Pereira TA, Ramos DN, Lopez RFV. Hydrogel increases localized transport regions and skin permeability during low frequency ultrasound treatment. Sci Rep 2017; 7:44236. [PMID: 28287146 PMCID: PMC5347001 DOI: 10.1038/srep44236] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Accepted: 02/06/2017] [Indexed: 11/09/2022] Open
Abstract
Low frequency ultrasound (LFU) enhances skin permeability via the formation of heterogeneous localized transport regions (LTRs). In this work, hydrogels with different zeta potentials were used as the coupling medium for LFU to investigate their contribution to LTR patterns and to the skin penetration of two model drugs, calcein and doxorubicin (DOX). When hydrogels were used, LTRs covering at least a 3-fold greater skin area were observed compared to those resulting from traditional LFU treatment and sodium lauryl sulfate. More LTRs resulted in an enhancement of calcein skin permeation. The zeta potential of the hydrogels affected the skin penetration of the positively charged DOX; the cationic coupling medium decreased the DOX recovered from the viable epidermis by 2.8-fold, whereas the anionic coupling medium increased the DOX accumulation in the stratum corneum by 4.4-fold. Therefore, LFU/hydrogel treatment increases LTRs areas and can target ionized drugs to specific skin layers depending on the zeta potential of the coupling medium.
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Affiliation(s)
- Tatiana Aparecida Pereira
- University of Sao Paulo, School of Pharmaceutical Sciences of Ribeirao Preto, Ribeirao Preto, SP, Brazil
| | - Danielle Nishida Ramos
- University of Sao Paulo, School of Pharmaceutical Sciences of Ribeirao Preto, Ribeirao Preto, SP, Brazil
| | - Renata F V Lopez
- University of Sao Paulo, School of Pharmaceutical Sciences of Ribeirao Preto, Ribeirao Preto, SP, Brazil
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9
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Biophysics in cancer: The relevance of drug-membrane interaction studies. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:2231-2244. [DOI: 10.1016/j.bbamem.2016.06.025] [Citation(s) in RCA: 116] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 05/31/2016] [Accepted: 06/26/2016] [Indexed: 12/26/2022]
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10
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Yamada A, Shimizu N, Hikima T, Takata M, Kobayashi T, Takahashi H. Effect of Cholesterol on the Interaction of Cytochrome P450 Substrate Drug Chlorzoxazone with the Phosphatidylcholine Bilayer. Biochemistry 2016; 55:3888-98. [DOI: 10.1021/acs.biochem.6b00286] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ayumi Yamada
- Biophysics
Laboratory, Division of Pure and Applied Science, Graduate School
of Science and Technology, Gunma University, 4-2 Aramaki, Maebashi, Gunma 371-8510, Japan
| | - Nobutaka Shimizu
- Photon
Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
| | - Takaaki Hikima
- RIKEN SPring-8 Center, 1-1-1
Kouto, Sayo, Hyougo 679-5148, Japan
| | - Masaki Takata
- RIKEN SPring-8 Center, 1-1-1
Kouto, Sayo, Hyougo 679-5148, Japan
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1
Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan
| | - Toshihide Kobayashi
- Lipid
Biology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hiroshi Takahashi
- Biophysics
Laboratory, Division of Pure and Applied Science, Graduate School
of Science and Technology, Gunma University, 4-2 Aramaki, Maebashi, Gunma 371-8510, Japan
- RIKEN SPring-8 Center, 1-1-1
Kouto, Sayo, Hyougo 679-5148, Japan
- Lipid
Biology Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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11
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Mohan A, Narayanan S, Balasubramanian G, Sethuraman S, Krishnan UM. Dual drug loaded nanoliposomal chemotherapy: A promising strategy for treatment of head and neck squamous cell carcinoma. Eur J Pharm Biopharm 2015; 99:73-83. [PMID: 26690333 DOI: 10.1016/j.ejpb.2015.11.017] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 11/27/2015] [Accepted: 11/29/2015] [Indexed: 11/29/2022]
Abstract
The rising incidence of head and neck cancer and the drawbacks of currently used therapeutic strategies such as salvage surgery followed by adjuvant chemo- or radiotherapy have encouraged pursuits for better therapeutic approaches. This work describes the development and characterization of a PEGylated liposomal nanocarrier encapsulated with trans-resveratrol (Res), a plant stilbenoid, and doxorubicin hydrochloride (Dox), a standard chemotherapeutic agent for treatment of oral squamous cell carcinoma. The two drugs were loaded in liposomes prepared from egg phosphatidylcholine and DSPE-PEG with maximum encapsulation efficiencies of about 80% for each drug achieved at Res to Dox ratio of 2:1. The liposomal suspension was found to be stable with a zeta potential of -30.53 mV and size of approximately 250 nm. Thermal properties and release kinetics of the dual drug loaded liposomes were determined. The nanoformulation was evaluated for its in vitro anticancer efficacy on an oral squamous cell carcinoma cell line (NT8e). The cell uptake mechanism of the liposomal formulation was determined using pharmacological inhibitors for different endocytosis pathways. The combination effect of the two drugs was evaluated in free form and was found to have synergistic effects. The formulation was found to have a higher IC50 value than that of free doxorubicin hydrochloride but was found to have a superior effect on the signaling proteins involved in apoptosis and cell cycle.
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Affiliation(s)
- Aarti Mohan
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India
| | - Shridhar Narayanan
- Orchid Chemicals and Pharmaceuticals Pvt. Ltd., Sozhinganallur, Chennai 600 119, Tamil Nadu, India
| | - Gopalan Balasubramanian
- Orchid Chemicals and Pharmaceuticals Pvt. Ltd., Sozhinganallur, Chennai 600 119, Tamil Nadu, India
| | - Swaminathan Sethuraman
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India
| | - Uma Maheswari Krishnan
- Centre for Nanotechnology & Advanced Biomaterials, School of Chemical & Biotechnology, SASTRA University, Thanjavur 613 401, Tamil Nadu, India.
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12
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Kotecka K, Krysinski P. Effect of tetracycline antibiotic on the monolayers of phosphatidylcholines at the air–water interface. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.05.055] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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13
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Jin Y, Wang S, Tong L, Du L. Rational design of didodecyldimethylammonium bromide-based nanoassemblies for gene delivery. Colloids Surf B Biointerfaces 2015; 126:257-64. [DOI: 10.1016/j.colsurfb.2014.12.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2014] [Revised: 12/15/2014] [Accepted: 12/17/2014] [Indexed: 10/24/2022]
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14
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Pedrini I, Gazzano E, Chegaev K, Rolando B, Marengo A, Kopecka J, Fruttero R, Ghigo D, Arpicco S, Riganti C. Liposomal nitrooxy-doxorubicin: one step over caelyx in drug-resistant human cancer cells. Mol Pharm 2014; 11:3068-79. [PMID: 25057799 DOI: 10.1021/mp500257s] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In this work we prepared and characterized two liposomal formulations of a semisynthetic nitric oxide (NO)-releasing doxorubicin (Dox), called nitrooxy-Dox (NitDox), which we previously demonstrated to be cytotoxic in Dox-resistant human colon cancer cells. Liposomes with 38.2% (Lip A) and 19.1% (Lip B) cholesterol were synthesized: both formulations had similar size and zeta potential values and caused the same intracellular distribution of free NitDox, but Lip B accumulated and released NitDox more efficiently. In Dox-resistant human colon cancer cells, Lip A and Lip B exhibited a more favorable kinetics of drug uptake and NO release, and a stronger cytotoxicity than Dox and free NitDox. While Caelyx, one of the liposomal Dox formulations approved for breast and ovary tumors treatment, was ineffective in Dox-resistant breast/ovary cancer cells, Lip B, and to a lesser extent Lip A, still exerted a significant cytotoxicity in these cells. This event was accompanied in parallel by a higher release of NO, which caused nitration of P-glycoprotein (Pgp) and multidrug resistance related protein 1 (MRP1), two transporters involved in Dox efflux, and impaired their pump activity. By doing so, the efflux kinetics of Dox after treatment with Lip B was markedly slowed down and the intracellular accumulation of Dox was increased in breast and ovary drug-resistant cells. We propose these liposomal formulations of NitDox as new tools with a specific indication for tumors overexpressing Pgp and MRP1.
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Affiliation(s)
- Isabella Pedrini
- Department of Drug Science and Technology, University of Torino , via Pietro Giuria 9, 10125 Torino, Italy
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15
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Nanoassemblies containing a fluorouracil/zidovudine glyceryl prodrug with phospholipase A2-triggered drug release for cancer treatment. Colloids Surf B Biointerfaces 2013; 112:421-8. [DOI: 10.1016/j.colsurfb.2013.08.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 07/23/2013] [Accepted: 08/18/2013] [Indexed: 11/22/2022]
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16
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Nieciecka D, Królikowska A, Joniec A, Krysinski P. Partitioning of doxorubicin into Langmuir and Langmuir–Blodgett biomimetic mixed monolayers: Electrochemical and spectroscopic studies. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.03.004] [Citation(s) in RCA: 8] [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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17
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Nieciecka D, Joniec A, Blanchard GJ, Krysinski P. Interactions of doxorubicin with organized interfacial assemblies. 1. Electrochemical characterization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14560-14569. [PMID: 24175734 DOI: 10.1021/la403765w] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Doxorubicin is an anthracycline that has found wide use as a chemotherapeutic agent, with the primary target of its action being nuclear DNA. Despite the large body of knowledge on this family of compounds, the mechanism of doxorubicin penetration through the cellular or nuclear membrane remains understood to a limited extent. The plasma membrane acts as a barrier to the permeation of polar molecules, and this effect is mainly due to the hydrophobicity of membrane interior. The partitioning of DOX molecules into the lipid bilayer must thus be the basis for its passive transport across the biological membrane and therefore a key area of research activity lies in understanding how the structure of the anthracycline influences its interactions with amphiphilic interfaces. We have studied interactions between doxorubicin and Langmuir/Langmuir-Blodgett monomolecular films of octadecylamine (C18NH2), dihexadecylphosphate (DHP) and 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), and DMPC bilayer films (Langmuir-Schaeffer) on a polycrystalline gold surface using ellipsometry, cyclic voltammetry, electrochemical impedance spectroscopy, and quartz crystal microbalance measurements. For all biomimetic films there is a substantial interaction between doxorubicin and the interface, and the extent of this interaction depends on the hydrophobic/hydrophilic properties of the film formed and its organization.
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Affiliation(s)
- Dorota Nieciecka
- Faculty of Chemistry, University of Warsaw , 02-093 Warsaw, Pasteur 1, Poland
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18
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Du L, Li G, Jin Y, Wang L, Xu Q, Dong J. Riboflavin laurate nanosuspensions as an intramuscular injection for long-term riboflavin supplementation. Int J Pharm 2013; 450:338-44. [DOI: 10.1016/j.ijpharm.2013.04.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 02/21/2013] [Accepted: 04/03/2013] [Indexed: 11/15/2022]
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19
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Wang CH, Kang ST, Yeh CK. Superparamagnetic iron oxide and drug complex-embedded acoustic droplets for ultrasound targeted theranosis. Biomaterials 2012; 34:1852-61. [PMID: 23219326 DOI: 10.1016/j.biomaterials.2012.11.037] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2012] [Accepted: 11/20/2012] [Indexed: 12/19/2022]
Abstract
Ultrasound-triggered acoustic droplet vaporization (ADV) has been reported as a mechanical and chemical theranostic strategy for tumor treatment. However, targeting of sufficient amounts of droplets to solid tumors to direct effective mechanical force toward tumor cells remains a major challenge. In this study, we incorporated superparamagnetic iron oxide (SPIO) nanoparticles into acoustic droplets to allow both magnetism-assisted targeting and magnetic resonance (MR)-guided ultrasound-triggered ADV. The multi-functionality of these droplets was further increased by co-encapsulation of the chemotherapeutic drug doxorubicin (DOX) and surface conjugation of anti-vascular endothelial growth factor receptor 2 antibody, to serve as an additional targeting moiety. Maximum loading capacities of 7.69 mg SPIO and 1.53 mg DOX per mL were achieved, and magnetic properties were characterized by determination of magnetic hysteresis curves and transverse relaxation rates. In vitro and in vivo MR imaging demonstrated the feasibility of dual modal imaging of SPIO-embedded droplets. Finally, a vessel-mimicking phantom model with live C6 glioma cells was used to demonstrate a 5.4-fold improvement in targeting efficacy by magnetism-assisted targeting of the SPIO-embedded droplets, and effective disruption of cells by insonation-induced ADV, suggesting the potential of developing this system for future clinical applications.
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Affiliation(s)
- Chung-Hsin Wang
- Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University, Hsinchu 30013, Taiwan
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20
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Nieciecka D, Krysinski P. Interactions of doxorubicin with self-assembled monolayer-modified electrodes: electrochemical, surface plasmon resonance (SPR), and gravimetric studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1100-1107. [PMID: 21218807 DOI: 10.1021/la103583g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present the results on the partitioning of doxorubicin (DOX), a potent anticancer drug, through the model membrane system, self-assembled monolayers (SAMs) on gold electrodes. The monolayers were formed from alkanethiols of comparable length with different ω-terminal groups facing the aqueous electrolyte: the hydrophobic -CH(3) groups for the case of dodecanethiol SAMs or hydrophilic -OH groups of mercaptoundecanol SAMs. The electrochemical experiments combined with the surface plasmon resonance (SPR) and gravimetric studies show that doxorubicin is likely adsorbed onto the surface of hydrophilic monolayer, while for the case of the hydrophobic one the drug mostly penetrates the monolayer moiety. The adsorption of the drug hinders further penetration of doxorubicin into the monolayer moiety.
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Affiliation(s)
- Dorota Nieciecka
- Laboratory of Electrochemistry, Faculty of Chemistry, University of Warsaw, 02-093 Warsaw, Pasteur 1, Poland
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Taveira SF, Nomizo A, Lopez RFV. Effect of the iontophoresis of a chitosan gel on doxorubicin skin penetration and cytotoxicity. J Control Release 2008; 134:35-40. [PMID: 19047006 DOI: 10.1016/j.jconrel.2008.11.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2008] [Revised: 10/06/2008] [Accepted: 11/05/2008] [Indexed: 10/21/2022]
Abstract
The aim of this work was to investigate doxorubicin (DOX) percutaneous absorption and retention in the skin following iontophoresis. The convective flow contribution to the overall electrotransport of DOX was also elucidated for a non-ionic hydroxyethylcellulose gel and a cationic chitosan gel. Moreover, the cytotoxicity of DOX and its formulations, with and without low electrical current, was verified. It was observed that iontophoresis of DOX significantly increased the skin permeation and retention of the drug. In addition, the electroosmotic flow was dramatically reduced when DOX was added to the non-ionic gel, thereby indicating that the drug interacted with negative charges in the skin. Interestingly, electroosmosis was also significantly reduced when the iontophoresis was performed in the presence of the chitosan gel, but in the absence of DOX. Consequently, the transport of an electroosmotic marker from this gel almost disappeared when the positively charged drug was added to the cationic gel. These results indicated that chitosan appeared to interact with negative charges in the skin. Hence, this carrier not only reduced electroosmotic flow, but also released DOX from ionic interactions with these sites and improved its diffusion to deeper skin layers. The application of the low electrical current directly to melanoma cells increased DOX cytotoxicity by nearly three-fold, which was probably due to membrane permeation.
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Affiliation(s)
- Stephânia F Taveira
- Faculdade de Ciências Farmacêuticas de Ribeirão Preto, Universidade de São Paulo, Av. do Café s/no., 14040-903, Ribeirão Preto, São Paulo, Brazil
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22
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Tsuchiya H, Nagayama M. Garlic allyl derivatives interact with membrane lipids to modify the membrane fluidity. J Biomed Sci 2008; 15:653-60. [PMID: 18506599 DOI: 10.1007/s11373-008-9257-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2008] [Accepted: 05/01/2008] [Indexed: 10/22/2022] Open
Abstract
As a novel approach to the mode of medicinal action of garlic, its constituents were comparatively studied with respect to their interactions with membrane lipids to modify the membrane fluidity. Allyl derivatives rigidified tumor cell and platelet model membranes consisting of unsaturated phospholipids and cholesterol at 20-500 muM with the potency being diallyl trisulfide (DATS) > diallyl disulfide (DADS) by preferentially acting on the hydrocarbon cores of lipid bilayers. They were also effective in rigidifying candida cell model membranes prepared with ergosterol and phospholipids at 100-500 microM with the potency being DADS > DATS > diallyl sulfide (DAS), but not bacteria cell model membranes without ergosterol. Alliin, a precursor of these DASs, was not active on any membranes at 500 microM. Both relative intensity and selectivity in membrane effects correlated with those in antiproliferative, antiplatelet and antimicrobial effects. In cell culture experiments, membrane-active DASs inhibited the growth of tumor cells cultured for 24 and 48 h at 20-500 muM to show the potency being DATS > DADS, together with rigidifying cell membranes by acting on their deeper regions more intensively. However, membrane-inactive allyl derivatives were not growth-inhibitory on tumor cells. The membrane lipid interactions of DASs appear to be one of possible mechanisms underlying different effects of garlic.
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Affiliation(s)
- Hironori Tsuchiya
- Department of Dental Basic Education, Asahi University School of Dentistry, Building 3, 1851 Hozumi, Mizuho, Gifu 501-0296, Japan.
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23
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Tsuchiya H, Tanaka T, Nagayama M, Oyama M, Iinuma M. Membrane Activity-Guided Isolation of Antiproliferative and Antiplatelet Constituent from Evodiopanax Innovans. Nat Prod Commun 2008. [DOI: 10.1177/1934578x0800300525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Bark of Evodiopanax innovans (Araliaceae) was subjected to membrane activity-guided extraction and chromatographic fractionation. The potency to interact with lipid membranes and change their fluidity was determined by measuring fluorescence polarization of liposomal and cell membranes. Plant preparations, including the MeOH extract and the specified fraction, reduced the fluidity of model biomembranes prepared with different phospholipids and cholesterol. Further purification led to the isolation of maltol 3- O-β-glucopyranoside, which inhibited tumor cell growth and platelet aggregation, together with rigidifying the cell membranes as well as the membrane-active antitumor compound (-)-epigallocatechin gallate and doxorubicin. The isolate at 100 μM and 1.0 mM showed growth inhibition of 13–49% against tumor cells cultured for 24 and 48 h. At 1.8–3.6 mM, it also produced 50% inhibition of platelet aggregation induced by collagen, adenosine 5′-diphosphate and thrombin. E. innovans is considered as a medicinal plant containing a potent bioactive constituent that exerts antiproliferative and antiplatelet effects through interaction with cell membranes to modify their fluidity.
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Affiliation(s)
- Hironori Tsuchiya
- Department of Dental Basic Education, Asahi University School of Dentistry, 1851-1 Hozumi, Mizuho, Gifu 501-0296, Japan
| | - Toshiyuki Tanaka
- Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
| | - Motohiko Nagayama
- Department of Dental Basic Education, Asahi University School of Dentistry, 1851-1 Hozumi, Mizuho, Gifu 501-0296, Japan
| | - Masayoshi Oyama
- Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
| | - Munekazu Iinuma
- Gifu Pharmaceutical University, 5-6-1 Mitahora-higashi, Gifu 502-8585, Japan
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24
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Chimote G, Banerjee R. Evaluation of antitubercular drug insertion into preformed dipalmitoylphosphatidylcholine monolayers. Colloids Surf B Biointerfaces 2007; 62:258-64. [PMID: 18082382 DOI: 10.1016/j.colsurfb.2007.10.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2007] [Revised: 10/22/2007] [Accepted: 10/23/2007] [Indexed: 11/16/2022]
Abstract
Insertion profiles of antitubercular drugs isoniazid (INH), rifampicin (RFM) and ethambutol (ETH) into dipalmitoylphosphatidylcholine (DPPC) membrane models were evaluated by Langmuir monolayer technique. Maximum drug insertion into DPPC monolayer was observed with rifampicin with a surface pressure increase (Deltapi(max)) in the range of 21-33 mN/m depending upon rifampicin concentration. Isoniazid had minimal insertion resulting in a lower Deltapi(max) of about 2-3 mN/m, suggestive of minimal interactions between INH and DPPC. Ethambutol surface pressure increment on insertion resulted in an intermediate rise in the Deltapi(max) (6-10 mN/m). Antitubercular drug combination in the ratio of 2 mM:0.7 mM:4.5 mM for INH:RFM:ETH, attained Deltapi(max) between 25 and 33 mN/m. Insertion profiles similar to rifampicin were exhibited by the antitubercular drug mixture suggestive of predominant rifampicin insertion into the DPPC monolayer. The extent of drug insertion into the DPPC monolayer is suggestive of the drug penetration potential into biological membranes in vivo. Higher RFM Deltapi(max) is suggestive of excellent cell membrane penetration, which explains broad reach of the drug to all the organs including the cerebrospinal fluid while lower Deltapi(max) of INH suggests poor membrane penetration restricting the entry of the drug in different biological membranes. DPPC membrane destabilization was observed at higher antitubercular drug concentrations indicated by the negative slopes of the surface pressure-time curves. This may correlate with the dose related toxic effects observed in tuberculosis affected patients. Drug insertion studies offer a potential tool in understanding the pharmacotoxicological behavior of the various pharmacological agents.
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Affiliation(s)
- G Chimote
- School of Biosciences & Bioengineering, Indian Institute of Technology Bombay, Mumbai 400076, India
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25
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Dignam JD, Qu X, Ren J, Chaires JB. Daunomycin Binding to Detergent Micelles: A Model System for Evaluating the Hydrophobic Contribution to Drug−DNA Interactions. J Phys Chem B 2007; 111:11576-84. [PMID: 17845023 DOI: 10.1021/jp066877n] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The interaction of daunomycin with sodium dodecyl sulfate and Triton X-100 micelles was investigated as a model for the hydrophobic contribution to the free energy of DNA intercalation reactions. Measurements of visible absorbance, fluorescence lifetime, steady-state fluorescence emission intensity, and fluorescence anisotropy indicate that the anthraquinone ring partitions into the hydrophobic micelle interior. Fluorescence quenching experiments using both steady-state and lifetime measurements demonstrate reduced accessibility of daunomycin in sodium dodecyl sulfate micelles to the anionic quencher iodide and to the neutral quencher acrylamide. Quenching of daunomycin fluorescence by iodide in Triton X-100 micelles was similar to that seen with free daunomycin. Studies of the energetics of the interaction of daunomycin with micelles by fluorescence and absorbance titration methods and by isothermal titration calorimetry in the presence of excess micelles revealed that association with sodium dodecyl sulfate and Triton X-100 micelles is driven by a large negative enthalpy. Association of the drug with both types of micelles also has a favorable entropic contribution, which is larger in magnitude for Triton X-100 micelles than for sodium dodecyl sulfate micelles. The thermodynamic profile for the interaction of daunomycin with both types of micelles is characteristic of the "nonclassical" hydrophobic effect. The enthalpy for the interaction of daunomycin with sodium dodecyl sulfate micelles increases nonlinearly with temperature, indicating a positive (and temperature dependent) heat capacity change. The binding isotherm for daunomycin association with sodium dodecyl sulfate micelles was cooperative, with a Hill coefficient of 1.6. The cooperative behavior and the positive heat capacity change suggest that the drug alters micelle size or imposes order on the hydrocarbon interior of the micelle.
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Affiliation(s)
- John David Dignam
- Department of Biochemistry and Cancer Biology, Block Health Science Building, University of Toledo College of Medicine, 3035 Arlington Avenue, Toledo, Ohio 43614-5804, USA.
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26
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Mady MM. Biophysical studies on collagen-lipid interaction. J Biosci Bioeng 2007; 104:144-8. [PMID: 17884660 DOI: 10.1263/jbb.104.144] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2007] [Accepted: 05/23/2007] [Indexed: 11/17/2022]
Abstract
The potential use of liposomes as a delivery system is still limited by the poor understanding of the interaction mechanisms of liposomes underlying with biological media. Interaction between liposomes and protein is important for the structure and function of cells. In the present work, the interaction between collagen and dipalmitoyl phosphatidylcholine (DPPC) liposomes was studied by solubilization using a nonionic detergent, octylglucoside (OG), as well as a monolayer technique. The solubilization of the liposomal membrane was found to proceed in three stages of transition from the vesicular form to the mixed micellar form. Moreover, the amount of detergent needed to completely solubilize the liposomal membrane was increased after the incubation of liposomes with collagen, indicating an increased membrane resistance to the detergent and hence, a change in the natural membrane permeation properties. The addition of collagen in the subphase of different monolayer films induced a considerable shift towards a larger area/molecule in the compression-isotherm curves. This is either due to the insertion of collagen into the monolayer via its hydrophobic residues or to adsorption causing a protein layer to be located parallel to the lipid monolayer. It was concluded that collagen significantly altered the physical state of the liposome membrane, which may be attributed to collagen interaction with the liposomal surface and/or to its incorporation within the bilayer membrane.
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Affiliation(s)
- Mohsen M Mady
- Biophysics Department, Faculty of Science, Cairo University, 12613 Giza, Egypt.
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Furusawa M, Tsuchiya H, Nagayama M, Tanaka T, Oyama M, Ito T, Iinuma M, Takeuchi H. Cell Growth Inhibition by Membrane-Active Components in Brownish Scale of Onion. ACTA ACUST UNITED AC 2006. [DOI: 10.1248/jhs.52.578] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Miyuki Furusawa
- Gifu Prefectural Institute of Health and Environmental Sciences
| | | | | | | | | | - Tetsuro Ito
- Gifu Prefectural Institute of Health and Environmental Sciences
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28
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KOO JS, SHIN K, JENG U, LIN TL, WU MH, CHI ZA, SHIH MC, HSU CH, LEE HY, CHIANG LY. LIPOPHILIC-FULLERENE DERIVATIVE MONOLAYERS AT THE AIR–WATER INTERFACE. INTERNATIONAL JOURNAL OF NANOSCIENCE 2002. [DOI: 10.1142/s0219581x02000401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Monolayers of a lipophilic C 60-derivative (FPTL) mixed in dipalmitoyl-phosphatidyl-choline (DPPC) have been studied by the Langmuir film balance technique and Brewster angle microscopy. Previous X-ray scattering studies showed that the FPTL molecules intercalated into the DPPC monolayers and modified the bending and compression modulus of the host DPPC membranes. Combined study of surface pressure–area isotherms and Brewster angle microscopy measurements clearly established that the liquid-condensed domain structures are strongly influenced by an addition of the fullerene bearing lipid molecules, where it caused smaller liquid-condensed domain structures.
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Affiliation(s)
- J. S. KOO
- Department of Materials Science and Engineering, KJIST, Kwangju, 500-712, Korea
| | - K. SHIN
- Department of Materials Science and Engineering, KJIST, Kwangju, 500-712, Korea
| | - U. JENG
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300, Taiwan, ROC
| | - T.-L. LIN
- Department of Engineering and System Science, National Tsing Hua University, Hsinchu 300, Taiwan, ROC
| | - M. H. WU
- Department of Physics, National Chung-Hsin University, Tai-Chung 402, Taiwan, ROC
| | - Z. A. CHI
- Department of Physics, National Chung-Hsin University, Tai-Chung 402, Taiwan, ROC
| | - M. C. SHIH
- Department of Physics, National Chung-Hsin University, Tai-Chung 402, Taiwan, ROC
| | - C.-H. HSU
- Synchrotron Radiation Research Center, Hsinchu 300, Taiwan, ROC
| | - H.-Y. LEE
- Synchrotron Radiation Research Center, Hsinchu 300, Taiwan, ROC
| | - L. Y. CHIANG
- Center for Condensed Matter Sciences, National Taiwan University, Taipei 106, Taiwan, ROC
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29
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Tsuchiya H, Nagayama M, Tanaka T, Furusawa M, Kashimata M, Takeuchi H. Membrane-rigidifying effects of anti-cancer dietary factors. Biofactors 2002; 16:45-56. [PMID: 14530593 DOI: 10.1002/biof.5520160301] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Since several anti-cancer drugs interact with cell membrane lipids, the effects of anti-cancer dietary factors on liposomal membranes with different lipid composition were comparatively studied by measuring fluorescence polarization. Fluidity was imparted on both hydrophobic and hydrophilic regions of lipid bilayers by decreasing cholesterol and increasing unsaturated phosphatidylcholine in membranes. At 0.625-10 microM, (-)-epigallocatechin gallate, genistein, apigenin, resveratrol and a reference anti-cancer drug, doxorubicin, rigidified the tumor cell model membranes consisting of 20 mol% cholesterol and 80 mol% phosphatidylcholine with the acyl chain 18:1/16:0 ratio of 1.0, but not daidzein. They were more effective on the membrane core than the membrane surface. Quercetin showed a biphasic effect on the hydrophobic regions of membrane lipid bilayers to rigidify above 5 microM and fluidize below 2.5 microM. In contrast, anti-cancer dietary factors and doxorubicin were not or much less effective in rigidifying the normal cell model membranes consisting of 40 mol% cholesterol and 60 mol% phosphatidylcholine with the acyl chain 18:1/16:0 ratio of 0.5. The membrane-rigidifying effects were greater depending on a decrease of the cholesterol/phosphatidylcholine ratio and an increase of the phosphatidylcholine unsaturation degree. Membrane-active dietary factors and doxorubicin inhibited the growth of mouse myeloma cells at 10-100 microM, while the growth inhibition by membrane-inactive daidzein was relatively weak. Anti-cancer dietary factors appear to act on more fluid membranes like tumor cells as well as doxorubicin to induce rigidification, especially in the hydrocarbon core of membrane lipids, which is determined by the composition of cholesterol and unsaturated phospholipids.
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Affiliation(s)
- Hironori Tsuchiya
- Department of Dental Pharmacology, Asahi University School of Dentistry, Hozumi, Gifu 501-0296, Japan.
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30
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Abstract
The effects of type-I collagen on dipalmitoyl phosphatidylcholine (DPPC) and dimyristoyl phosphatidylcholine (DMPC) monolayer films with different compositions were studied using monolayer technique. The addition of collagen in the subphase of different monolayer films induced a considerable shift towards larger area/molecule in the compression-isotherm curves. This is either referred to the insertion of collagen into the monolayer by its hydrophobic residues or to an adsorption process causing a protein layer to be located parallel to the lipid monolayer [1]. The variation of collagen interaction with different lipid compositions was also verified through the penetration-kinetics experiment. Comparing our results to the results of Pajean et al. [2] and Pajean and Herbage [3] on the effect of collagen on the stability of lipid vesicles implies that the collagen induced stability could be explained on the basis of collagen-lipid monolayer interaction.
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Affiliation(s)
- M M Ghannam
- Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt
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