1
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Soares TB, Loureiro L, Carvalho A, Oliveira MECR, Dias A, Sarmento B, Lúcio M. Lipid nanocarriers loaded with natural compounds: Potential new therapies for age related neurodegenerative diseases? Prog Neurobiol 2018; 168:21-41. [DOI: 10.1016/j.pneurobio.2018.04.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2018] [Revised: 03/12/2018] [Accepted: 04/05/2018] [Indexed: 12/28/2022]
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2
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Ali HR, Ali MRK, Wu Y, Selim SA, Abdelaal HFM, Nasr EA, El-Sayed MA. Gold Nanorods as Drug Delivery Vehicles for Rifampicin Greatly Improve the Efficacy of Combating Mycobacterium tuberculosis with Good Biocompatibility with the Host Cells. Bioconjug Chem 2016; 27:2486-2492. [PMID: 27595304 DOI: 10.1021/acs.bioconjchem.6b00430] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
TB remains a challenging disease to control worldwide. Nanoparticles have been used as drug carriers to deliver high concentrations of antibiotics directly to the site of infection, reducing the duration of treatment along with any side effects of off-target toxicities after systemic exposure to the antibiotics. Herein we have developed a drug delivery platform where gold nanorods (AuNRs) are conjugated to rifampicin (RF), which is released after uptake into macrophage cells (RAW264.7). Due to the nature of the macrophage cells, the nanoparticles are actively internalized into macrophages and release RF after uptake, under the safety frame of the host cells (macrophage). AuNRs without RF conjugation exhibit obvious antimicrobial activity. Therefore, AuNRs could be a promising antimycobacterial agent and an effective delivery vehicle for the antituberculosis drug Rifampicin for use in tuberculosis therapy.
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Affiliation(s)
- Hala R Ali
- School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332-0400, United States.,Animal Health Research Institute (AHRI) , Department of Bacteriology and Immunology, Dokki, Giza, Egypt.,Department of Veterinary Medicine, Cairo University , Giza, Cairo, Egypt
| | - Moustafa R K Ali
- School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332-0400, United States
| | - Yue Wu
- School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332-0400, United States
| | - Salah A Selim
- Department of Veterinary Medicine, Cairo University , Giza, Cairo, Egypt
| | - Hazem F M Abdelaal
- Department of Pathobiological Sciences, University of Wisconsin-Madison , Madison, Wisconsin 53706, United States
| | - Essam A Nasr
- Veterinary Serum and Vaccine Research Institute , Bacterial Diagnostics Research Department (Tuberculosis), Abbasia, Cairo, Egypt
| | - Mostafa A El-Sayed
- School of Chemistry and Biochemistry, Georgia Institute of Technology , Atlanta, Georgia 30332-0400, United States.,Adjunct Professor, School of Chemistry, King Abdul Aziz University , Jeddah, Saudi Arabia
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3
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Wiraja C, Mathiyazhakan M, Movahedi F, Upputuri PK, Cheng Y, Pramanik M, Yang L, Becker DL, Xu C. Near-infrared light-sensitive liposomes for enhanced plasmid DNA transfection. Bioeng Transl Med 2016; 1:357-364. [PMID: 29313020 PMCID: PMC5689532 DOI: 10.1002/btm2.10020] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 06/20/2016] [Accepted: 07/01/2016] [Indexed: 01/21/2023] Open
Abstract
Near‐infrared (NIR) light‐responsive liposomes are attractive carriers for targeted and controlled drug delivery to the superficial organ or tissue (e.g., skin). This work describes the development of NIR‐responsive liposomes by incorporating gold nanostars within liposomes composed of Phospholipon 90 g and cholesterol. Following cellular delivery, photothermal effect around the gold nanostar upon NIR stimulation induces microcavitation and liposome phase transition which consequently triggers the release of encapsulated molecules. Taking GFP plasmid as an example, we demonstrate enhanced gene transfection into fibroblasts following NIR treatment.
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Affiliation(s)
- Christian Wiraja
- School of Chemical and Biomedical Engineering Nanyang Technological University 70 Nanyang Drive Singapore 637457 Singapore
| | - Malathi Mathiyazhakan
- School of Chemical and Biomedical Engineering Nanyang Technological University 70 Nanyang Drive Singapore 637457 Singapore
| | - Fatemeh Movahedi
- School of Chemical and Biomedical Engineering Nanyang Technological University 70 Nanyang Drive Singapore 637457 Singapore
| | - Paul Kumar Upputuri
- School of Chemical and Biomedical Engineering Nanyang Technological University 70 Nanyang Drive Singapore 637457 Singapore
| | - Yingying Cheng
- Singapore Centre on Environmental Life Sciences Engineering (SCELSE) Nanyang Technological University 60 Nanyang Drive Singapore 637551 Singapore
| | - Manojit Pramanik
- School of Chemical and Biomedical Engineering Nanyang Technological University 70 Nanyang Drive Singapore 637457 Singapore
| | - Liang Yang
- Singapore Centre on Environmental Life Sciences Engineering (SCELSE) Nanyang Technological University 60 Nanyang Drive Singapore 637551 Singapore.,School of Biological Sciences, Division of Structural Biology and Biochemistry Nanyang Technological University Singapore 639798 Singapore
| | - David Laurence Becker
- Lee Kong Chian School of Medicine Nanyang Technological University 59 Nanyang Drive Singapore 636921 Singapore.,Institute of Medical Biology, Agency for Science Technology and Research (ASTAR), 8A-Biomedical grove, Biopolis Singapore 138648 Singapore
| | - Chenjie Xu
- School of Chemical and Biomedical Engineering Nanyang Technological University 70 Nanyang Drive Singapore 637457 Singapore.,NTU-Northwestern Institute for Nanomedicine, Nanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
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Zhou J, Jayawardana KW, Kong N, Ren Y, Hao N, Yan M, Ramström O. Trehalose-Conjugated, Photofunctionalized Mesoporous Silica Nanoparticles for Efficient Delivery of Isoniazid into Mycobacteria. ACS Biomater Sci Eng 2015; 1:1250-1255. [DOI: 10.1021/acsbiomaterials.5b00274] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Juan Zhou
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
| | - Kalana W. Jayawardana
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
| | - Na Kong
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
| | - Yansong Ren
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
| | - Nanjing Hao
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
| | - Mingdi Yan
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
- Department
of Chemistry, University of Massachusetts Lowell, 1 University
Avenue, Lowell, Massachusetts 01854, United States
| | - Olof Ramström
- Department
of Chemistry, KTH−Royal Institute of Technology, Teknikringen
30, S-10044 Stockholm, Sweden
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Hwang AA, Lee BY, Clemens DL, Dillon BJ, Zink JI, Horwitz MA. pH-Responsive Isoniazid-Loaded Nanoparticles Markedly Improve Tuberculosis Treatment in Mice. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:5066-78. [PMID: 26193431 PMCID: PMC5628743 DOI: 10.1002/smll.201500937] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/23/2015] [Indexed: 05/07/2023]
Abstract
Tuberculosis is a major global health problem for which improved therapeutics are needed to shorten the course of treatment and combat emergence of drug resistance. Mycobacterium tuberculosis, the etiologic agent of tuberculosis, is an intracellular pathogen of mononuclear phagocytes. As such, it is an ideal pathogen for nanotherapeutics because macrophages avidly ingest nanoparticles even without specific targeting molecules. Hence, a nanoparticle drug delivery system has the potential to target and deliver high concentrations of drug directly into M. tuberculosis-infected cells-greatly enhancing efficacy while avoiding off-target toxicities. Stimulus-responsive mesoporous silica nanoparticles of two different sizes, 100 and 50 nm, are developed as carriers for the major anti-tuberculosis drug isoniazid in a prodrug configuration. The drug is captured by the aldehyde-functionalized nanoparticle via hydrazone bond formation and coated with poly(ethylene imine)-poly(ethylene glycol) (PEI-PEG). The drug is released from the nanoparticles in response to acidic pH at levels that naturally occur within acidified endolysosomes. It is demonstrated that isoniazid-loaded PEI-PEG-coated nanoparticles are avidly ingested by M. tuberculosis-infected human macrophages and kill the intracellular bacteria in a dose-dependent manner. It is further demonstrated in a mouse model of pulmonary tuberculosis that the nanoparticles are well tolerated and much more efficacious than an equivalent amount of free drug.
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Affiliation(s)
- Angela A Hwang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 3013 Young Dr. East, CA, 90095-1569, USA
| | - Bai-Yu Lee
- Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, CHS 37-121, 10833 Le Conte Ave., CA, 90095-1688, USA
| | - Daniel L Clemens
- Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, CHS 37-121, 10833 Le Conte Ave., CA, 90095-1688, USA
| | - Barbara Jane Dillon
- Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, CHS 37-121, 10833 Le Conte Ave., CA, 90095-1688, USA
| | - Jeffrey I Zink
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 3013 Young Dr. East, CA, 90095-1569, USA
- California NanoSystems Institute, University of California, Los Angeles, CA, 90095-8352, USA
| | - Marcus A Horwitz
- Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, CHS 37-121, 10833 Le Conte Ave., CA, 90095-1688, USA
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Yang B, Geng SY, Wang JY. Physical stability of cholesterol derivatives combined with liposomes and their in vitro behavior. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2015; 2013:4114-7. [PMID: 24110637 DOI: 10.1109/embc.2013.6610450] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The purpose of this study was to investigate the physical stability and drug release of two cholesterol derivatives (4-cholesterocarbonyl-4'-(N,N,N-triethylamine butyloxyl bromide, CTBBA, and 4-cholesterocarbonyl-4'-(N,N'-diethylamino-butyloxy, CDBA), when combined with doxorubicin (DOX)-loaded liposomes in vitro. CTBBA-liposome revealed a positive charge at a pH between 3 and 10, as indicated by the ζ-potential. DOX-encapsulated CTBBA-liposomes possessed better physical stability both in PBS and in fetal bovine serum (FBS) added to PBS.
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Pucci C, Scipioni A, Diociaiuti M, La Mesa C, Pérez L, Pons R. Catanionic vesicles and DNA complexes: a strategy towards novel gene delivery systems. RSC Adv 2015. [DOI: 10.1039/c5ra15466a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Catanionic vesicles and DNA form complexes, the structure and composition of which depend on the DNA content. The DNA undergoes a reversible compaction process and its release can be triggered by adding an anionic surfactant to the complexes.
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Affiliation(s)
- C. Pucci
- Dept. of Chemistry
- La Sapienza University
- Rome
- Italy
| | - A. Scipioni
- Dept. of Chemistry
- La Sapienza University
- Rome
- Italy
| | - M. Diociaiuti
- Dip. di Tecnologie e Salute
- Istituto Superiore di Sanità
- I-00185 Rome
- Italy
| | - C. La Mesa
- Dept. of Chemistry
- La Sapienza University
- Rome
- Italy
| | - L. Pérez
- Institut Química Avançada de Catalunya
- IQAC-CSIC
- 08034 Barcelona
- Spain
| | - R. Pons
- Institut Química Avançada de Catalunya
- IQAC-CSIC
- 08034 Barcelona
- Spain
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Saifullah B, Arulselvan P, El Zowalaty ME, Fakurazi S, Webster TJ, Geilich BM, Hussein MZ. Development of a biocompatible nanodelivery system for tuberculosis drugs based on isoniazid-Mg/Al layered double hydroxide. Int J Nanomedicine 2014; 9:4749-62. [PMID: 25336952 PMCID: PMC4200032 DOI: 10.2147/ijn.s63608] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The primary challenge in finding a treatment for tuberculosis (TB) is patient non-compliance to treatment due to long treatment duration, high dosing frequency, and adverse effects of anti-TB drugs. This study reports on the development of a nanodelivery system that intercalates the anti-TB drug isoniazid into Mg/Al layered double hydroxides (LDHs). Isoniazid was found to be released in a sustained manner from the novel nanodelivery system in humans in simulated phosphate buffer solutions at pH 4.8 and pH 7.4. The nanodelivery formulation was highly biocompatible compared to free isoniazid against human normal lung and 3T3 mouse fibroblast cells. The formulation was active against Mycobacterium tuberculosis and gram-positive bacteria and gram-negative bacteria. Thus results show significant promise for the further study of these nanocomposites for the treatment of TB.
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Affiliation(s)
- Bullo Saifullah
- Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Palanisamy Arulselvan
- Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Mohamed Ezzat El Zowalaty
- Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, Malaysia ; Department of Environmental Health, Faculty of Public Health and Tropical Medicine, Jazan University, Jazan, Saudi Arabia
| | - Sharida Fakurazi
- Laboratory of Vaccines and Immunotherapeutics, Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, Malaysia ; Department of Human Anatomy, Faculty of Medicine and Health Science, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | - Thomas J Webster
- Department of Chemical Engineering and Program in Bioengineering, Northeastern University, Boston, MA, USA ; Center of Excellence for Advanced Materials Research, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Benjamin M Geilich
- Department of Chemical Engineering and Program in Bioengineering, Northeastern University, Boston, MA, USA
| | - Mohd Zobir Hussein
- Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
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Kang ML, Im GI. Drug delivery systems for intra-articular treatment of osteoarthritis. Expert Opin Drug Deliv 2013; 11:269-82. [PMID: 24308404 DOI: 10.1517/17425247.2014.867325] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Intra-articular (IA) drug delivery is very useful in the treatment of osteoarthritis (OA), the most common chronic joint affliction. However, the therapeutic effect of IA administration depends mostly on the efficacy of drug delivery. AREAS COVERED The present article reviews the current status of IA therapy for OA treatment as well as its rationale. Outlines of drug delivery parameters such as release profile, retention time, distribution, size and transport that influence the drug's biological performance in the joints are summarized. New delivery systems, currently under investigation, including liposome, nanoparticle, microparticle and hydrogel formulations are introduced. Functionalized drug delivery systems by targeting and thermoresponsiveness that are being investigated for OA treatment via IA therapy are also addressed. EXPERT OPINION Several delivery systems, including liposome, microparticles, nanoparticles and hydrogels, have been investigated for the sustained drug delivery to the joints. These can be advanced by the use of functionalized drug delivery systems that can lead targeting to specific regions and thermoresponsiveness for prolonged drug release in the joints. Further advances will bring forth new biocompatible and biodegradable materials as a drug carrier or new combination regimens. Future innovations in this field should be directed toward the development of adapted delivery systems that can induce tissue regeneration in OA patients.
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Affiliation(s)
- Mi Lan Kang
- Dongguk University Ilsan Hospital, Department of Orthopedics , Goyang 410-773 , Korea +82 31 961 7315 ; +82 31 961 7314 ;
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Targeted intracellular delivery of antituberculosis drugs to Mycobacterium tuberculosis-infected macrophages via functionalized mesoporous silica nanoparticles. Antimicrob Agents Chemother 2012; 56:2535-45. [PMID: 22354311 DOI: 10.1128/aac.06049-11] [Citation(s) in RCA: 166] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Delivery of antituberculosis drugs by nanoparticles offers potential advantages over free drug, including the potential to target specifically the tissues and cells that are infected by Mycobacterium tuberculosis, thereby simultaneously increasing therapeutic efficacy and decreasing systemic toxicity, and the capacity for prolonged release of drug, thereby allowing less-frequent dosing. We have employed mesoporous silica nanoparticle (MSNP) drug delivery systems either equipped with a polyethyleneimine (PEI) coating to release rifampin or equipped with cyclodextrin-based pH-operated valves that open only at acidic pH to release isoniazid (INH) into M. tuberculosis-infected macrophages. The MSNP are internalized efficiently by human macrophages, traffic to acidified endosomes, and release high concentrations of antituberculosis drugs intracellularly. PEI-coated MSNP show much greater loading of rifampin than uncoated MSNP and much greater efficacy against M. tuberculosis-infected macrophages. MSNP were devoid of cytotoxicity at the particle doses employed for drug delivery. Similarly, we have demonstrated that the isoniazid delivered by MSNP equipped with pH-operated nanovalves kill M. tuberculosis within macrophages significantly more effectively than an equivalent amount of free drug. These data demonstrate that MSNP provide a versatile platform that can be functionalized to optimize the loading and intracellular release of specific drugs for the treatment of tuberculosis.
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Pisani M, Mobbili G, Placentino IF, Smorlesi A, Bruni P. Biophysical Characterization of Complexes of DNA with Mixtures of the Neutral Lipids 1,2-Dioleoyl-sn-glycero-3-phosphoethanolamine-N-hexanoylamine or 1,2-Dioleoyl-sn-glycero-3-phosphoethanolamine-N-dodecanoylamine and 1,2-Dioleoyl-sn-glycero-3-phosphocholine in the Presence of Bivalent Metal Cations for DNA Transfection. J Phys Chem B 2011; 115:10198-206. [DOI: 10.1021/jp202577u] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Michela Pisani
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Giovanna Mobbili
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Immacolata F. Placentino
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
| | - Arianna Smorlesi
- Department of Pathology and Innovative Therapies, Polytechnic University of Marche, Via Tronto 10/A, 60100 Ancona, Italy
| | - Paolo Bruni
- Chemistry Division of the ISAC Department, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
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Sabín J, Prieto G, Messina PV, Ruso JM, Hidalgo-Alvarez R, Sarmiento F. On the effect of Ca2+ and La3+ on the colloidal stability of liposomes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:10968-75. [PMID: 16285760 DOI: 10.1021/la051397t] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
This work deals with the effect of Ca2+ and La3+ on the colloidal stability of phosphatidylcholine (PC) liposomes in aqueous media. As physical techniques, nephelometry, photon correlation spectroscopy, electrophoretic mobility, and surface tension were used. The theoretical predictions of the colloidal stability of liposomes were followed using the Derjaguin-Landau-Verwey-Overbeek theory. Changes in the size of liposomes and high polydispersity values were observed as La3+ concentration increases, suggesting that this cation induces the aggregation of liposomes. However, changes in polydispersity were not observed with Ca2+, suggesting a coalescence mechanism or fusion of liposomes. The stability factor (W), calculated from the nephelometry measurements indicated that aggregation/fusion occurs at a critical concentration (c.c.) of 0.3 and 0.7 M for La3+ and Ca2+, respectively. To gain a better insight into the interaction mechanism between the liposomes and the studied ions, the interaction between PC monolayers and Ca2+ and La3+ was studied. Changes in the surface area per lipid molecule (A0) in the monolayer at the c.c. values were found for both ions, with a more pronounced effect in the case of Ca2+. This corresponds with a larger reduction of the steric repulsive interaction between the headgroups at the phospholipid membrane (pi(head)). The experimental result validates the hypothesis made on the liposome fusion in the presence of Ca2+ and liposome aggregation in the presence of La3+. These aggregation mechanisms have also been confirmed by transmission electron microscopy.
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Affiliation(s)
- Juan Sabín
- Grupo de Biofísica e Interfases, Departamento de Física Aplicada. Facultade de Física, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
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Gaber MH, Abd El Halim N, Khalil WA. Effect of microwave radiation on the biophysical properties of liposomes. Bioelectromagnetics 2005; 26:194-200. [PMID: 15768431 DOI: 10.1002/bem.20064] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Steadily growing use of electromagnetic fields, especially in conjunction with wireless communication systems, has led to increasing public concern about possible health effects of electromagnetic radiation. However, besides the well-known thermal effect of electromagnetic fields on biological tissue, there is no clear evidence of further athermal interaction mechanisms with biological systems. The present study was designed to determine the changes in bilayer permeability in egg lecithin multilamellar vesicles after exposure to 900 MHz microwave radiation for a period of 5 h. Specific absorption rate (SAR) of the radiation for the investigated liposome sample was found to be 12 +/- 1 W/kg. Liposomal changes in permeability were monitored using a light scattering technique. Optical anisotropy of the liposome sample decreased dramatically upon exposure to microwave radiation, indicating structural changes in acyl chain packing. IR and NMR ((1)H NMR) studies, which have been employed to reveal structural alterations in microwave, exposed vesicles showed an increased damage upon exposure to microwave. The changes observed in the (1)H NMR spectrum of the microwave exposed sample indicated hydrolysis of carboxylic and phosphoric esters. IR study showed conformational changes in the acyl chains of the lipids upon microwave exposure. However, both IR and (31)P NMR did not show any appreciable changes in the head group part of the lipids.
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Affiliation(s)
- Mohamed H Gaber
- Biophysics Department, Faculty of Science, Cairo University, Giza, Egypt.
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14
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Abstract
Time-resolved multiangle laser light scattering (TR-MALLS) is used to monitor the temporal variation of DNA/cationic liposome lipoplex molar masses and geometric sizes throughout the complexation process. The measured molar masses and geometric sizes are in turn used to estimate lipoplex density. The DNA/cationic lipid charge ratio is found to be the primary factor governing lipoplex formation kinetics and the final lipoplex molar mass, geometric size and density. Charge ratios near unity lead to a growing kinetic regime in which initially formed primary lipoplexes undergo further aggregation eventually forming large molar mass lipoplexes of high density, while charge ratios very far from unity yield low molar mass lipoplexes of lower density. It is also noted that solvent composition can play a significant role in the lipoplex formation process with lipoplexes formed in ion-containing media being larger and denser than those formed in dextrose solution.
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Affiliation(s)
- Eva Lai
- Department of Chemical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA
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Literature alerts. J Microencapsul 2000; 17:657-69. [PMID: 11038124 DOI: 10.1080/026520400417702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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