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Yuzu K, Imamura H, Nozaki T, Fujii Y, Badawy SMM, Morishima K, Okuda A, Inoue R, Sugiyama M, Chatani E. Mechanistic Modeling of Amyloid Oligomer and Protofibril Formation in Bovine Insulin. J Mol Biol 2024; 436:168461. [PMID: 38301805 DOI: 10.1016/j.jmb.2024.168461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/22/2024] [Accepted: 01/26/2024] [Indexed: 02/03/2024]
Abstract
Early phase of amyloid formation, where prefibrillar aggregates such as oligomers and protofibrils are often observed, is crucial for understanding pathogenesis. However, the detailed mechanisms of their formation have been difficult to elucidate because they tend to form transiently and heterogeneously. Here, we found that bovine insulin protofibril formation proceeds in a monodisperse manner, which allowed us to characterize the detailed early aggregation process by light scattering in combination with thioflavin T fluorescence and Fourier transform infrared spectroscopy. The protofibril formation was specific to bovine insulin, whereas no significant aggregation was observed in human insulin. The kinetic analysis combining static and dynamic light scattering data revealed that the protofibril formation process in bovine insulin can be divided into two steps based on fractal dimension. When modeling the experimental data based on Smoluchowski aggregation kinetics, an aggregation scheme consisting of initial fractal aggregation forming spherical oligomers and their subsequent end-to-end association forming protofibrils was clarified. Furthermore, the analysis of temperature and salt concentration dependencies showed that the end-to-end association is the rate-limiting step, involving dehydration. The established model for protofibril formation, wherein oligomers are incorporated as a precursor, provides insight into the molecular mechanism by which protein molecules assemble during the early stage of amyloid formation.
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Affiliation(s)
- Keisuke Yuzu
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan
| | - Hiroshi Imamura
- Department of Bio-Science, Nagahama Institute of Bio-Science and Technology, 1266 Tamura, Nagahama, Shiga 526-0829, Japan
| | - Takuro Nozaki
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan
| | - Yuki Fujii
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan
| | - Shaymaa Mohamed Mohamed Badawy
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan; Department of Agricultural Biochemistry, Faculty of Agriculture, Zagazig University, Zagazig, Egypt
| | - Ken Morishima
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
| | - Aya Okuda
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
| | - Rintaro Inoue
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
| | - Masaaki Sugiyama
- Institute for Integrated Radiation and Nuclear Science, Kyoto University, Kumatori, Osaka 590-0494, Japan
| | - Eri Chatani
- Department of Chemistry, Graduate School of Science, Kobe University, Kobe, Hyogo 657-8501, Japan.
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Sundaram V, Ramanan RN, Selvaraj M, Ahemad N, Vijayaraghavan R, MacFarlane DR, Ooi CW. Probing the molecular interactions between cholinium-based ionic liquids and insulin aspart: A combined computational and experimental study. Int J Biol Macromol 2023; 253:126665. [PMID: 37689282 DOI: 10.1016/j.ijbiomac.2023.126665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 08/29/2023] [Accepted: 08/31/2023] [Indexed: 09/11/2023]
Abstract
Despite extensive studies revealing the potential of cholinium-based ionic liquids (ILs) in protein stabilization, the nature of interaction between ILs' constituents and protein residues is not well understood. In this work, we used a combined computational and experimental approach to investigate the structural stability of a peptide hormone, insulin aspart (IA), in ILs containing a choline cation [Ch]+ and either dihydrogen phosphate ([Dhp]-) or acetate ([Ace]-) as anions. Although IA remained stable in both 1 M [Ch][Dhp] and 1 M [Ch][Ace], [Dhp]- exhibited a much stronger stabilization effect than [Ace]-. Both the hydrophilic ILs intensely hydrated IA and increased the number of water molecules in IA's solvation shell. Undeterred by the increased number of water molecules, the native state of IA's hydrophobic core was maintained in the presence of ILs. Importantly, our results reveal the importance of IL concentration in the medium which was critical to maintain a steady population of ions in the microenvironment of IA and to counteract the denaturing effect of water molecules. Through molecular docking, we confirm that the anions exert the dominant effect on the structure of IA, while [Ch]+ have the secondary influence. The computational results were validated using spectroscopic analyses (ultra-violet, fluorescence, and circular dichroism) along with dynamic light scattering measurements. The extended stability of IA at 30 °C for 28 days in 1 M [Ch][Dhp] and [Ch][Ace] demonstrated in this study reveals the possibility of stabilizing IA using cholinium-based ILs.
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Affiliation(s)
- Vidya Sundaram
- Chemical Engineering Department, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia
| | - Ramakrishnan Nagasundara Ramanan
- Chemical Engineering Department, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia; Arkema Thiochemicals Sdn Bhd, Oasis Ara Damansara, 47301 Petaling Jaya, Selangor, Malaysia
| | - Manikandan Selvaraj
- Chemical Engineering Department, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia; Department of Neuroscience, Mayo Clinic, Jacksonville, FL, USA
| | - Nafees Ahemad
- School of Pharmacy, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia
| | - R Vijayaraghavan
- School of Chemistry, Faculty of Science, Monash University, Clayton, Victoria 3800, Australia
| | - Douglas R MacFarlane
- School of Chemistry, Faculty of Science, Monash University, Clayton, Victoria 3800, Australia
| | - Chien Wei Ooi
- Chemical Engineering Department, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia; Advanced Engineering Platform, Monash University Malaysia, Jalan Lagoon Selatan, 47500 Bandar Sunway, Selangor, Malaysia.
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Pourhosseini PS, Ghasemitabesh R, Pirhaghi M, Fayazzadeh S, Saboury AA, Najafi F. Urethane-containing cationic gemini surfactants with amphiphilic tails: novel near-neutral protein carriers with minor effects on insulin structure. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Li S, Liang N, Yan P, Kawashima Y, Sun S. Inclusion complex based on N-acetyl-L-cysteine and arginine modified hydroxypropyl-β-cyclodextrin for oral insulin delivery. Carbohydr Polym 2021; 252:117202. [DOI: 10.1016/j.carbpol.2020.117202] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 09/17/2020] [Accepted: 10/05/2020] [Indexed: 02/08/2023]
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5
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Mirzaei Garakani T, Liu Z, Glebe U, Gehrmann J, Lazar J, Mertens MAS, Möller M, Hamzelui N, Zhu L, Schnakenberg U, Böker A, Schwaneberg U. In Situ Monitoring of Membrane Protein Insertion into Block Copolymer Vesicle Membranes and Their Spreading via Potential-Assisted Approach. ACS APPLIED MATERIALS & INTERFACES 2019; 11:29276-29289. [PMID: 31329408 DOI: 10.1021/acsami.9b09302] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Synthosomes are polymer vesicles with transmembrane proteins incorporated into block copolymer membranes. They have been used for selective transport in or out of the vesicles as well as catalysis inside the compartments. However, both the insertion process of the membrane protein, forming nanopores, and the spreading of the vesicles on planar substrates to form solid-supported biomimetic membranes have been rarely studied yet. Herein, we address these two points and, first, shed light on the real-time monitoring of protein insertion via isothermal titration calorimetry. Second, the spreading process on different solid supports, namely, SiO2, glass, and gold, via different techniques like spin- and dip-coating as well as a completely new approach of potential-assisted spreading on gold surfaces was studied. While inhomogeneous layers occur via traditional methods, our proposed potential-assisted strategy to induce adsorption of positively charged vesicles by applying negative potential on the electrode leads to remarkable vesicle spreading and their further fusion to form more homogeneous planar copolymer films on gold. The polymer vesicles in our study are formed from amphiphilic copolymers poly(2-methyl oxazoline)-block-poly(dimethylsiloxane)-block-poly(2-methyl oxazoline) (PMOXA-b-PDMS-b-PMOXA). Engineered variants of the transmembrane protein ferric hydroxamate uptake protein component A (FhuA), one of the largest β-barrel channel proteins, are used as model nanopores. The incorporation of FhuA Δ1-160 is shown to facilitate the vesicle spreading process further. Moreover, high accessibility of cysteine inside the channel was proven by linkage of a fluorescent dye inside the engineered variant FhuA ΔCVFtev and hence preserved functionality of the channels after spreading. The porosity and functionality of the spread synthosomes on the gold plates have been examined by studying the passive ion transport response in the presence of Li+ and ClO4- ions and electrochemical impedance spectroscopy analysis. Our approach to form solid-supported biomimetic membranes via the potential-assisted strategy could be important for the development of new (bio-) sensors and membranes.
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Affiliation(s)
- Tayebeh Mirzaei Garakani
- Institute of Biotechnology , RWTH Aachen University , Worringer Weg 3 , D-52074 Aachen , Germany
- DWI - Leibniz Institute for Interactive Materials , Forckenbeckstraße 50 , D-52074 , Aachen , Germany
| | - Zhanzhi Liu
- Institute of Biotechnology , RWTH Aachen University , Worringer Weg 3 , D-52074 Aachen , Germany
| | - Ulrich Glebe
- Fraunhofer Institute for Applied Polymer Research IAP , Geiselbergstraße 69 , 14476 Potsdam -Golm, Germany
- Chair of Polymer Materials and Polymer Technologies, Institute of Chemistry , University of Potsdam , Karl-Liebknecht-Str. 24-25 , 14476 Potsdam -Golm, Germany
| | - Julia Gehrmann
- Institute of Biotechnology , RWTH Aachen University , Worringer Weg 3 , D-52074 Aachen , Germany
| | - Jaroslav Lazar
- Institute of Materials in Electrical Engineering 1 , RWTH Aachen University , Sommerfeldstraße 24 , 52074 Aachen , Germany
| | | | - Mieke Möller
- Institute of Biotechnology , RWTH Aachen University , Worringer Weg 3 , D-52074 Aachen , Germany
| | - Niloofar Hamzelui
- Institute of Biotechnology , RWTH Aachen University , Worringer Weg 3 , D-52074 Aachen , Germany
| | - Leilei Zhu
- Institute of Biotechnology , RWTH Aachen University , Worringer Weg 3 , D-52074 Aachen , Germany
| | - Uwe Schnakenberg
- Institute of Materials in Electrical Engineering 1 , RWTH Aachen University , Sommerfeldstraße 24 , 52074 Aachen , Germany
| | - Alexander Böker
- Fraunhofer Institute for Applied Polymer Research IAP , Geiselbergstraße 69 , 14476 Potsdam -Golm, Germany
- Chair of Polymer Materials and Polymer Technologies, Institute of Chemistry , University of Potsdam , Karl-Liebknecht-Str. 24-25 , 14476 Potsdam -Golm, Germany
| | - Ulrich Schwaneberg
- Institute of Biotechnology , RWTH Aachen University , Worringer Weg 3 , D-52074 Aachen , Germany
- DWI - Leibniz Institute for Interactive Materials , Forckenbeckstraße 50 , D-52074 , Aachen , Germany
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Mohsennia M, Motaharinejad A, Rafiee-Pour HA, Torabbeigi M. Thermodynamic and kinetic studies of As2O3 toxicological effects on human insulin in generation diabetes mellitus. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2017. [DOI: 10.1134/s0036024417120202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Zhang Y, Li L, Han M, Hu J, Zhang L. Amphiphilic Lipopeptide-Mediated Transport of Insulin and Cell Membrane Penetration Mechanism. Molecules 2015; 20:21569-83. [PMID: 26633348 PMCID: PMC6332136 DOI: 10.3390/molecules201219771] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 10/25/2015] [Accepted: 11/12/2015] [Indexed: 11/16/2022] Open
Abstract
Arginine octamer (R8) and its derivatives were developed in this study for the enhanced mucosal permeation of insulin. R8 was substituted with different aminos, then modified with stearic acid (SA). We found that the SAR6EW-insulin complex had stronger intermolecular interactions and higher complex stability. The amphiphilic lipopeptide (SAR6EW) was significantly more efficient for the permeation of insulin than R8 and R6EW both in vitro and in vivo. Interestingly, different cellular internalization mechanisms were observed for the complexes. When the effectiveness of the complexes in delivering insulin in vivo was examined, it was found that the SAR6EW-insulin complex provided a significant and sustained (six hours) reduction in the blood glucose levels of diabetic rats. The improved absorption could be the comprehensive result of stronger intermolecular interactions, better enzymatic stability, altered internalization pathways, and increased transportation efficacy. In addition, no sign of toxicity was observed after consecutive administrations of SAR6EW. These results demonstrate that SAR6EW is a promising epithelium permeation enhancer for insulin and suggest that the chemical modification of cell-penetrating peptides is a feasible strategy to enhance their potential.
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Affiliation(s)
- Yu Zhang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, 210046, China.
| | - Lei Li
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, 210046, China.
| | - Mei Han
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, 210046, China.
| | - Jiaoyin Hu
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, 210046, China.
| | - Liefeng Zhang
- Jiangsu Key Laboratory for Molecular and Medical Biotechnology, College of Life Science, Nanjing Normal University, Nanjing, 210046, China.
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8
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Rawat S, Gupta P, Kumar A, Garg P, Suri CR, Sahoo DK. Molecular Mechanism of Poly(vinyl alcohol) Mediated Prevention of Aggregation and Stabilization of Insulin in Nanoparticles. Mol Pharm 2015; 12:1018-30. [DOI: 10.1021/mp5003653] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Sanjay Rawat
- CSIR−Institute of Microbial Technology, Sector 39-A, Chandigarh 160036, India
| | - Pawan Gupta
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, Sector 67, Mohali 160062, India
| | - Anil Kumar
- CSIR−Institute of Microbial Technology, Sector 39-A, Chandigarh 160036, India
| | - Prabha Garg
- Department of Pharmacoinformatics, National Institute of Pharmaceutical Education and Research, Sector 67, Mohali 160062, India
| | - C. Raman Suri
- CSIR−Institute of Microbial Technology, Sector 39-A, Chandigarh 160036, India
| | - Debendra K. Sahoo
- CSIR−Institute of Microbial Technology, Sector 39-A, Chandigarh 160036, India
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Shamaeli E, Alizadeh N. Functionalized gold nanoparticle-polypyrrole nanobiocomposite with high effective surface area for electrochemical/pH dual stimuli-responsive smart release of insulin. Colloids Surf B Biointerfaces 2015; 126:502-9. [DOI: 10.1016/j.colsurfb.2015.01.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 12/20/2014] [Accepted: 01/04/2015] [Indexed: 12/01/2022]
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10
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Rad I, Mobasheri H, Najafi F, Rezaei M. Efficient repairing effect of PEG based tri-block copolymer on mechanically damaged PC12 cells and isolated spinal cord. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:1539-1551. [PMID: 24519755 DOI: 10.1007/s10856-014-5168-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 01/27/2014] [Indexed: 06/03/2023]
Abstract
Membrane sealing effects of polymersomes made of tri-block copolymer, PEG-co-FA/SC-co-PEG, (PFSP) were studied on isolated spinal cord strips, PC12 cell lines and artificial bilayer following mechanical impact implemented by aneurism clip, sonication and electric shock, respectively. The homogeneity and size of PFSP, membrane permeability and cell viability were assessed by dynamic light scattering, LDH release and MTT assays. According to the results, the biocompatible, physico-chemical, size, surface charge and amphipathic nature of PFSP polymersome makes it an ideal macromolecule to rapidly reseal damaged membranes of cells in injured spinal cord as well as in culture medium. Compound action potentials recorded from intentionally damaged spinal cord strips incubated with PFSP showed restoration of neural excitability by 82.24 % and conduction velocity by 96.72 % after 5 min that monitored in real time. Thus, they triggered efficient instant and sustained sealing of membrane and reactivation of temporarily inactivated axons. Treatment of ultrasonically damaged PC12 cells by PFSP caused efficient cell membrane repair and led to their increased viability. The optimum effects of PFSP on stabilization and impermeabilizing of the lipid bilayer occurred at the same concentrations applied to the damaged cells and spinal cord fibers and was approved by restoration of membrane conductance and calcein release manifested by NanoDrop technique. The unique physico-chemical characteristics of novel polymersomes introduced here, make them capable to reorganize membrane lipid molecules, reseal the breaches and restore the hydrophobic insulation in spinal cord damaged cells. Thus, they might be considered in the clinical treatment of SCI at early stages.
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Affiliation(s)
- Iman Rad
- Laboratory of Membrane Biophysics and Macromolecules, Institute of Biochemistry & Biophysics, University of Tehran, PO Box 13145-1384, Tehran, Iran,
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Mahajan RK, Chabba S, Sharma R. Interaction of an Amphiphilic Drug Trifluoperazine Dihydrochloride with Pluronic Triblock Copolymers: A Physicochemical Study. Ind Eng Chem Res 2014. [DOI: 10.1021/ie403828u] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Rakesh Kumar Mahajan
- Department of Chemistry,
UGC—Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India
| | - Shruti Chabba
- Department of Chemistry,
UGC—Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India
| | - Rabia Sharma
- Department of Chemistry,
UGC—Centre for Advanced Studies, Guru Nanak Dev University, Amritsar 143005, India
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12
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Banerjee R, Gupta S, Dey D, Maiti S, Dhara D. Synthesis of PEG containing cationic block copolymers and their interaction with human serum albumin. REACT FUNCT POLYM 2014. [DOI: 10.1016/j.reactfunctpolym.2013.11.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Robles E, Juárez J, Burboa MG, Gutiérrez LE, Taboada P, Mosquera V, Valdez MA. Properties of insulin-chitosan complexes obtained by an alkylation reaction on chitosan. J Appl Polym Sci 2013. [DOI: 10.1002/app.39999] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Emmanuel Robles
- Departamento de Investigación en Polímeros y Materiales; Universidad de Sonora, Rosales y Transversal; Hermosillo 83000 Sonora México
| | - Josué Juárez
- Departamento de Física; Universidad de Sonora, Rosales y Transversal; Hermosillo 83000 Sonora México
| | - María. G. Burboa
- Departamento de Investigaciones Científicas y Tecnológicas; Universidad de Sonora, Rosales y Transversal; Hermosillo 83000 Sonora México
| | - Luis E. Gutiérrez
- Departamento de Investigaciones Científicas y Tecnológicas; Universidad de Sonora, Rosales y Transversal; Hermosillo 83000 Sonora México
| | - Pablo Taboada
- Laboratorio de Física de Coloides y Polímeros, Grupo de Sistemas Complejos, Departamento de Física de la Materia Condensada, Facultad de Física; Universidad de Santiago de Compostela; Santiago de Compostela 15782 Spain
| | - Víctor Mosquera
- Laboratorio de Física de Coloides y Polímeros, Grupo de Sistemas Complejos, Departamento de Física de la Materia Condensada, Facultad de Física; Universidad de Santiago de Compostela; Santiago de Compostela 15782 Spain
| | - Miguel A. Valdez
- Departamento de Física; Universidad de Sonora, Rosales y Transversal; Hermosillo 83000 Sonora México
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Pourhosseini PS, Saboury AA, Najafi F, Divsalar A, Sarbolouki MN. Characterization and Release Behavior of Polymersomes of PEG-Poly(fumaric-sebacic acids)-PEG Triblock Copolymer in Aqueous Solution. POLYMER-KOREA 2013. [DOI: 10.7317/pk.2013.37.3.294] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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15
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Antacid co-encapsulated polyester nanoparticles for peroral delivery of insulin: Development, pharmacokinetics, biodistribution and pharmacodynamics. Int J Pharm 2013; 440:99-110. [DOI: 10.1016/j.ijpharm.2011.12.038] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2011] [Revised: 12/06/2011] [Accepted: 12/22/2011] [Indexed: 01/04/2023]
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16
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Insulin complexes with PEGylated basic oligopeptides. J Colloid Interface Sci 2012; 384:61-72. [DOI: 10.1016/j.jcis.2012.06.068] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 06/18/2012] [Accepted: 06/19/2012] [Indexed: 12/23/2022]
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17
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Ashjari M, Khoee S, Mahdavian AR, Rahmatolahzadeh R. Self-assembled nanomicelles using PLGA-PEG amphiphilic block copolymer for insulin delivery: a physicochemical investigation and determination of CMC values. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:943-953. [PMID: 22354326 DOI: 10.1007/s10856-012-4562-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2011] [Accepted: 01/25/2012] [Indexed: 05/31/2023]
Abstract
Self-assembled nanomicelles can be used as synthetic biomaterials and colloidal carriers for poorly water-soluble drug delivery systems. Some of these micellar systems have been introduced in clinical trials and showed hopeful results relating to their therapeutic index in patients. Biodegradable nanomicelle was prepared from self-assembling amphiphilic block copolymer composed of poly(DL-lactic-co-glycolic acid) (PLGA) as a core and polyethylene glycol (PEG) as a corona. The PLGA-PEG block copolymer was first synthesized and characterized by FTIR, (1)H NMR, GPC and inherent viscosity measurements. The nanomicelle formed by PLGA-PEG block copolymer in the aqueous solution was characterized by dynamic light scattering, zeta potential, scanning electron microscopy (SEM) and fluorescence excitation and emission spectra of pyrene probe. The critical micelle concentration of obtained nanomicelle was about 0.006 mg/mL, with the size of about 160 nm and the zeta potential of -29 mV. Insulin-loaded PLGA-PEG nanomicelles were prepared by modified dialysis method and the physicochemical parameters of the micelles such as drug content, entrapment efficiency and in vitro drug release were characterized. The results showed that insulin was entrapped into PLGA-PEG nanomicelles with drug loading of 3.9 wt% and entrapment efficiency of 55 wt%. The nanomicelles containing insulin exhibited a controlled release profile. These observations suggested that the PLGA-PEG block copolymers nanomicelles have been prepared by a new synthetic route are potent nanocarrier for poorly water-soluble drugs as insulin.
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Affiliation(s)
- Mohsen Ashjari
- Polymer Science Department, Iran Polymer & Petrochemical Institute, Tehran, Iran.
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18
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Calorimetric and spectroscopic studies of the interactions between insulin and (−)-epigallocatechin-3-gallate. Biochem Eng J 2012. [DOI: 10.1016/j.bej.2012.01.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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19
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Zhang L, Song L, Zhang C, Ren Y. Improving intestinal insulin absorption efficiency through coadministration of cell-penetrating peptide and hydroxypropyl-β-cyclodextrin. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.10.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Niu M, Lu Y, Hovgaard L, Wu W. Liposomes containing glycocholate as potential oral insulin delivery systems: preparation, in vitro characterization, and improved protection against enzymatic degradation. Int J Nanomedicine 2011; 6:1155-66. [PMID: 21822379 PMCID: PMC3148843 DOI: 10.2147/ijn.s19917] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Indexed: 01/28/2023] Open
Abstract
Background: Oral delivery of insulin is challenging and must overcome the barriers of gastric and enzymatic degradation as well as low permeation across the intestinal epithelium. The present study aimed to develop a liposomal delivery system containing glycocholate as an enzyme inhibitor and permeation enhancer for oral insulin delivery. Methods: Liposomes containing sodium glycocholate were prepared by a reversed-phase evaporation method followed by homogenization. The particle size and entrapment efficiency of recombinant human insulin (rhINS)-loaded sodium glycocholate liposomes can be easily adjusted by tuning the homogenization parameters, phospholipid:sodium glycocholate ratio, insulin:phospholipid ratio, water:ether volume ratio, interior water phase pH, and the hydration buffer pH. Results: The optimal formulation showed an insulin entrapment efficiency of 30% ± 2% and a particle size of 154 ± 18 nm. A conformational study by circular dichroism spectroscopy and a bioactivity study confirmed the preserved integrity of rhINS against preparative stress. Transmission electron micrographs revealed a nearly spherical and deformed structure with discernable lamella for sodium glycocholate liposomes. Sodium glycocholate liposomes showed better protection of insulin against enzymatic degradation by pepsin, trypsin, and α-chymotrypsin than liposomes containing the bile salt counterparts of sodium taurocholate and sodium deoxycholate. Conclusion: Sodium glycocholate liposomes showed promising in vitro characteristics and have the potential to be able to deliver insulin orally.
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Affiliation(s)
- Mengmeng Niu
- School of Pharmacy, Fudan University, Shanghai, People's Republic of China
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Thompson C, Cheng WP, Gadad P, Skene K, Smith M, Smith G, McKinnon A, Knott R. Uptake and Transport of Novel Amphiphilic Polyelectrolyte-Insulin Nanocomplexes by Caco-2 Cells—Towards Oral Insulin. Pharm Res 2011; 28:886-96. [DOI: 10.1007/s11095-010-0345-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Accepted: 12/03/2010] [Indexed: 10/18/2022]
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Arginine end-functionalized poly(l-lysine) dendrigrafts for the stabilization and controlled release of insulin. J Colloid Interface Sci 2010; 351:433-41. [DOI: 10.1016/j.jcis.2010.07.072] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 07/29/2010] [Accepted: 07/30/2010] [Indexed: 11/22/2022]
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23
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Bjelić S, Jelesarov I. A survey of the year 2007 literature on applications of isothermal titration calorimetry. J Mol Recognit 2008; 21:289-312. [PMID: 18729242 DOI: 10.1002/jmr.909] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Elucidation of the energetic principles of binding affinity and specificity is a central task in many branches of current sciences: biology, medicine, pharmacology, chemistry, material sciences, etc. In biomedical research, integral approaches combining structural information with in-solution biophysical data have proved to be a powerful way toward understanding the physical basis of vital cellular phenomena. Isothermal titration calorimetry (ITC) is a valuable experimental tool facilitating quantification of the thermodynamic parameters that characterize recognition processes involving biomacromolecules. The method provides access to all relevant thermodynamic information by performing a few experiments. In particular, ITC experiments allow to by-pass tedious and (rarely precise) procedures aimed at determining the changes in enthalpy and entropy upon binding by van't Hoff analysis. Notwithstanding limitations, ITC has now the reputation of being the "gold standard" and ITC data are widely used to validate theoretical predictions of thermodynamic parameters, as well as to benchmark the results of novel binding assays. In this paper, we discuss several publications from 2007 reporting ITC results. The focus is on applications in biologically oriented fields. We do not intend a comprehensive coverage of all newly accumulated information. Rather, we emphasize work which has captured our attention with originality and far-reaching analysis, or else has provided ideas for expanding the potential of the method.
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Affiliation(s)
- Sasa Bjelić
- Biochemisches Institut der Universität Zürich, Winterthurerstrasse 190, Zürich, Switzerland
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Asadi A, Saboury AA, Moosavi-Movahedi A, Divsalar A, Sarbolouki MN. Interaction of bovine serum albumin with some novel PEG-containing diblock copolymers. Int J Biol Macromol 2008; 43:262-70. [DOI: 10.1016/j.ijbiomac.2008.06.005] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2007] [Revised: 05/28/2008] [Accepted: 06/11/2008] [Indexed: 10/21/2022]
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