1
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Cui T, Li S, Chen S, Liang Y, Sun H, Wang L. "Stealth" dendrimers with encapsulation of indocyanine green for photothermal and photodynamic therapy of cancer. Int J Pharm 2021; 600:120502. [PMID: 33746010 DOI: 10.1016/j.ijpharm.2021.120502] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 03/06/2021] [Accepted: 03/13/2021] [Indexed: 12/14/2022]
Abstract
Poly(amido amine) dendrimers and indocyanine green have inevitable interaction with proteins and cells, which induces biological toxicity and reduces therapeutic efficacy in vivo. To overcome these shortcomings, a new drug delivery system G5MEK7C(n)-ICG with a "stealth" layer was prepared. The surface of G5MEK7C(n)-ICG was modified with double-layer super hydrophilic zwitterionic materials. In the "stealth" double-layer structure, the outer layer was consisted of zwitterionic Glu-Lys-Glu-Lys-Glu-Lys-Cys (EK7) peptide, and the inner layer was composed of amino and carboxyl groups with a ratio of 1:1. DLS results showed that the average hydrodynamic size of G5MEK7C(n)-ICG was about 25-30 nm, and the zeta potential was proven to undergo a slight charge reversal with the increasing pH values of solutions. Furthermore, G5MEK7C(n)-ICG exhibited excellent biocompatibility to red blood cells and proteins resistance. Photothermal and photodynamic experiments demonstrated that G5MEK7C(n)-ICG had a good photothermal conversion effect and generated singlet oxygen (1O2) under laser irradiation. The MTT and hemolysis results showed that the toxicity of G5 PAMAM was significantly reduced after modification double-layer structure. Cytotoxicity studies and flow cytometry showed G5MEK7C(70)-ICG under laser irradiation had a good effect on killing A549 cells. More importantly, the tumor inhibition rate of mice treated with G5MEK7C(70)-ICG (under laser irradiation) was 78.2% in vivo, which was higher than that of mice treated with free ICG. Compared with free ICG, G5MEK7C(70)-ICG caused less damage to the liver according to the enzyme activities of alanine aminotransferase (ALT) and aspartate aminotransferase (AST). Therefore, dendrimers modified with a zwitterionic double layer will be a promising candidate as a drug delivery system.
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Affiliation(s)
- Tianming Cui
- Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Heavy Metal Deep-remediation in Water and Resource Reuse, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China; State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China
| | - Shukai Li
- Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Heavy Metal Deep-remediation in Water and Resource Reuse, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Shengfu Chen
- Key Laboratory of Biomass Chemical Engineering of Ministry of Education, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
| | - Ying Liang
- Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Heavy Metal Deep-remediation in Water and Resource Reuse, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China
| | - Haotian Sun
- Ocean Nano Tech, LLC, San Diego, CA 92126, USA
| | - Longgang Wang
- Key Laboratory of Applied Chemistry, Hebei Key Laboratory of Heavy Metal Deep-remediation in Water and Resource Reuse, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China; State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China.
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2
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Smith RJ, Fabiani T, Wang S, Ramesh S, Khan S, Santiso E, Silva FLB, Gorman C, Menegatti S. Exploring the physicochemical and morphological properties of peptide‐hybridized dendrimers (
DendriPeps
) and their aggregates. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20200277] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Ryan J. Smith
- Department of ChemistryNorth Carolina State University Raleigh North Carolina USA
| | - Thomas Fabiani
- Department of Chemical and Biomolecular EngineeringNorth Carolina State University Raleigh North Carolina USA
| | - Siyao Wang
- Department of Chemical and Biomolecular EngineeringNorth Carolina State University Raleigh North Carolina USA
| | - Srivatsan Ramesh
- Department of Chemical and Biomolecular EngineeringNorth Carolina State University Raleigh North Carolina USA
| | - Saad Khan
- Department of Chemical and Biomolecular EngineeringNorth Carolina State University Raleigh North Carolina USA
| | - Erik Santiso
- Department of Chemical and Biomolecular EngineeringNorth Carolina State University Raleigh North Carolina USA
| | - Fernando Luis Barroso Silva
- Faculty of Pharmaceutical Sciences at Ribeirão PretoUniversidade de São Paulo Ribeirão Preto São Paulo Brazil
| | - Christopher Gorman
- Department of ChemistryNorth Carolina State University Raleigh North Carolina USA
| | - Stefano Menegatti
- Department of Chemical and Biomolecular EngineeringNorth Carolina State University Raleigh North Carolina USA
- Golden Leaf Biomanufacturing Training & Education Center Raleigh North Carolina USA
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3
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Wu Y, Wu D, Zhao H, Li J, Li X, Wang Z, Wang H, Zhu F, Xu B. Synthesis and properties of hyperbranched polymers for polymer light emitting devices with sunlight-style white emission. RSC Adv 2019; 9:22176-22184. [PMID: 35519492 PMCID: PMC9066655 DOI: 10.1039/c9ra03307f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2019] [Accepted: 06/27/2019] [Indexed: 01/27/2023] Open
Abstract
A new series of hyperbranched polymers consisting of fluorene-alt-carbazole as the branches and the three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene (SDF) as the core were designed and synthesized by one-pot Suzuki coupling polycondensation. A phosphor group with broad full width at half maximum (FWHM) bis(1-phenyl-isoquinoline)(acetylacetonato)iridium(iii) (Ir(Brpiq)2acac, 0.08 mol%) as the red-light emitting unit and bis(2-(4-bromophenyl)-1-[6-(9-carbazolyl)hexyl]-imidazole)(2-(5-(4-fluorinated phenyl)-1,3,4-triazole)pyridine)iridium(iii) ((CzhBrPI)2Ir(fpptz)) as the green-light emitting unit were introduced into the backbones to obtain sunlight-style white-light emission by adjusting the feeding ratios of (CzhBrPI)2Ir(fpptz) (0.08 to 0.32 mol%). The results indicate the synthesized polymers show high thermal stabilities and good amorphous film morphology because of the hyperbranched structures. Besides, the lowest unoccupied molecular orbital (LUMO) levels of polymers were reduced and the electron injection was improved because of excellent electron-transporting ability of the triazole unit in the green group. The hyperbranched structures can effectively suppress the polymers' chain distortion and aggregation, and promote the incomplete Förster resonance energy transfer (FRET) efficiency from fluorene-alt-carbazole segments to Ir complex units. As a result, the devices with hyperbranched polymer light-emitting layers realize white light emission, and the optimized device also exhibits good electroluminescent (EL) performance with Commission Internationale de l'Eclairage (CIE) coordinates at (0.32, 0.31), a maximum luminance of 9054 cd m−2, a maximum current efficiency of 3.59 cd A−1 and a maximum Color Rendering Index (CRI) of 91. The hyperbranched polymers based on fluorene-alt-carbazole branches and a SDF core and high-efficiency phosphor groups with broad full width at half maximum are attractive candidates for sunlight-style white polymer light-emitting device. A potential hyperbranched structure with fluorene-alt-carbazole branches, a 3D-structured SDF core, and green (CzhBrPI)2Ir(fpptz) and red Ir(piq)2acac adjusting light units is synthesized for efficient and stable sunlight-style white polymer light-emitting devices.![]()
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Affiliation(s)
- Yuling Wu
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China .,Department of Physics, Institute of Advanced Materials, and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University Kowloon Tong Hong Kong P. R. China
| | - Dongyu Wu
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China
| | - Haocheng Zhao
- Department of Electrical Engineering, Shanxi Institute of Energy Taiyuan 030600 China.,College of Materials Science and Engineering, Taiyuan University of Science and Technology Taiyuan 030024 China
| | - Jie Li
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China
| | - Xuefeng Li
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China
| | - Zhongqiang Wang
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China
| | - Hua Wang
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China
| | - Furong Zhu
- Department of Physics, Institute of Advanced Materials, and Institute of Research and Continuing Education (Shenzhen), Hong Kong Baptist University Kowloon Tong Hong Kong P. R. China
| | - Bingshe Xu
- Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology Taiyuan 030024 China
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4
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Wang B, Sun Y, Davis TP, Ke PC, Wu Y, Ding F. Understanding Effects of PAMAM Dendrimer Size and Surface Chemistry on Serum Protein Binding with Discrete Molecular Dynamics Simulations. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2018; 6:11704-11715. [PMID: 30881771 PMCID: PMC6413314 DOI: 10.1021/acssuschemeng.8b01959] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Polyamidoamine (PAMAM) dendrimers, a class of polymeric nanoparticles (NPs) with highly-controllable sizes and surface chemistry, are promising candidates for many biomedical applications, including drug and gene delivery, imaging, and inhibition of amyloid aggregation. In circulation, binding of serum proteins with dendritic NPs renders the formation of protein corona and alters the biological identity of the NP core, which may subsequently elicit immunoresponse and cytotoxicity. Understanding the effects of PAMAM size and surface chemistry on serum protein binding is, therefore, crucial to enable their broad biomedical applications. Here, by applying atomistic discrete molecular dynamics (DMD) simulations, we first uncovered the binding of PAMAM with HSA and Ig and detailed the dependences of such binding on PAMAM size and surface modification. Compared to either anionic or cationic surfaces, modifications with neutral phosphorylcholine (PC), polyethylene glycol (PEG), and hydroxyls (OH) significantly reduced binding with proteins. The relatively strong binding between proteins and PAMAM dendrimers with charged surface groups was mainly driven by electrostatic interactions as well as hydrophobic interactions. Using steered DMD (SDMD) simulations, we conducted a force-pulling experiment in silico estimating the critical forces separating PAMAM-protein complexes and deriving the corresponding free energy barriers for dissociation. The SDMD-derived HSA-binding affinities were consistent with existing experimental measurements. Our results highlighted the association dynamics of protein-dendrimer interactions and binding affinities, whose implications range from fundamental nanobio interfacial phenomena to the development of "stealth NPs".
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Affiliation(s)
- Bo Wang
- department of Physics and Astronomy, Clemson University,
Clemson, SC 29634, USA
- Department of Systems and Computational Biology, Albert
Einstein College of Medicine, Bronx, NY 10461, USA
| | - Yunxiang Sun
- department of Physics and Astronomy, Clemson University,
Clemson, SC 29634, USA
| | - Thomas P. Davis
- ARC Centre of Excellence in Convergent Bio-Nano Science and
Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381
Royal Parade, Parkville, VIC 3052, Australia
| | - Pu Chun Ke
- ARC Centre of Excellence in Convergent Bio-Nano Science and
Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381
Royal Parade, Parkville, VIC 3052, Australia
| | - Yinghao Wu
- Department of Systems and Computational Biology, Albert
Einstein College of Medicine, Bronx, NY 10461, USA
| | - Feng Ding
- department of Physics and Astronomy, Clemson University,
Clemson, SC 29634, USA
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5
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Geitner NK, Zhao W, Ding F, Chen W, Wiesner MR. Mechanistic Insights from Discrete Molecular Dynamics Simulations of Pesticide-Nanoparticle Interactions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:8396-8404. [PMID: 28686420 DOI: 10.1021/acs.est.7b01674] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Nanoscale particles have the potential to modulate the transport, lifetimes, and ultimate uptake of pesticides that may otherwise be bound to agricultural soils. Engineered nanoparticles provide a unique platform for studying these interactions. In this study, we utilized discrete molecular dynamics (DMD) as a screening tool for examining nanoparticle-pesticide adsorptive interactions. As a proof-of-concept, we selected a library of 15 pesticides common in the United States and 4 nanomaterials with likely natural or incidental sources, and simulated all possible nanoparticle-pesticide pairs. The resulting adsorption coefficients derived from DMD simulations ranged over several orders of magnitude, and in many cases were significantly stronger than pesticide adsorption on clay surfaces, highlighting the significance of specific nanoscale phases as a preferential media with which pesticides may associate. Binding was found to be significantly enhanced by the capacity to form hydrogen bonds with slightly hydroxylated fullerols, highlighting the importance of considering the precise nature of weathered nanomaterials as opposed to pristine precursors. Results were compared to experimental adsorption studies using selected pesticides, with a Pearson correlation coefficient of 0.97.
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Affiliation(s)
- Nicholas K Geitner
- Center for the Environmental Implications of NanoTechnology, Department of Civil and Environmental Engineering, Duke University , Durham, North Carolina 27708, United States
| | - Weilu Zhao
- College of Environmental Science and Engineering, Nankai University , Tianjin 300350, China
| | - Feng Ding
- Department of Physics and Astronomy, Clemson University , Clemson, South Carolina 29634, United States
| | - Wei Chen
- College of Environmental Science and Engineering, Nankai University , Tianjin 300350, China
| | - Mark R Wiesner
- Center for the Environmental Implications of NanoTechnology, Department of Civil and Environmental Engineering, Duke University , Durham, North Carolina 27708, United States
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6
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Salehi M, Rodriguez R, Boettcher A, Powers S, Geitner N, Ladner DA, Rikard S, Whelton AJ. Impact of dispersant on early life stages of the water flea
Daphnia magna
and the eastern oyster
Crassostrea virginica. J Appl Toxicol 2017; 37:1464-1470. [PMID: 28653411 DOI: 10.1002/jat.3494] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 05/05/2017] [Accepted: 05/15/2017] [Indexed: 12/24/2022]
Affiliation(s)
- Maryam Salehi
- Lyles School of Civil Engineering Purdue University IN 47907 USA
| | | | - Anne Boettcher
- Embry‐Riddle Aeronautical University Undergraduate Research Institute and Honors Program, Hazy Library Prescott AZ 86301 USA
| | - Sean Powers
- University of South Alabama Department of Marine Sciences AL 36688‐0002 USA
| | - Nick Geitner
- Center for the Environmental Implications of NanoTechnology Duke University Durham NC 27708‐0287 USA
| | - David A. Ladner
- Department of Environmental Engineering and Earth Sciences Clemson University Anderson SC 29625 USA
| | - Scott Rikard
- Auburn University, Auburn University Shellfish Laboratory AL 36528 USA
| | - Andrew J. Whelton
- Lyles School of Civil Engineering, Division of Environmental and Ecological Engineering Purdue University IN 47907 USA
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7
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Márquez-Miranda V, Abrigo J, Rivera JC, Araya-Durán I, Aravena J, Simon F, Pacheco N, González-Nilo FD, Cabello-Verrugio C. The complex of PAMAM-OH dendrimer with Angiotensin (1-7) prevented the disuse-induced skeletal muscle atrophy in mice. Int J Nanomedicine 2017; 12:1985-1999. [PMID: 28331320 PMCID: PMC5357082 DOI: 10.2147/ijn.s125521] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Angiotensin (1–7) (Ang-(1–7)) is a bioactive heptapeptide with a short half-life and has beneficial effects in several tissues – among them, skeletal muscle – by preventing muscle atrophy. Dendrimers are promising vehicles for the protection and transport of numerous bioactive molecules. This work explored the use of a neutral, non-cytotoxic hydroxyl-terminated poly(amidoamine) (PAMAM-OH) dendrimer as an Ang-(1–7) carrier. Bioinformatics analysis showed that the Ang-(1–7)-binding capacity of the dendrimer presented a 2:1 molar ratio. Molecular dynamics simulation analysis revealed the capacity of neutral PAMAM-OH to protect Ang-(1–7) and form stable complexes. The peptide coverage ability of the dendrimer was between ~50% and 65%. Furthermore, an electrophoretic mobility shift assay demonstrated that neutral PAMAM-OH effectively bonded peptides. Experimental results showed that the Ang-(1–7)/PAMAM-OH complex, but not Ang-(1–7) alone, had an anti-atrophic effect when administered intraperitoneally, as evaluated by muscle strength, fiber diameter, myofibrillar protein levels, and atrogin-1 and MuRF-1 expressions. The results of the Ang-(1–7)/PAMAM-OH complex being intraperitoneally injected were similar to the results obtained when Ang-(1–7) was systemically administered through mini-osmotic pumps. Together, the results suggest that Ang-(1–7) can be protected for PAMAM-OH when this complex is intraperitoneally injected. Therefore, the Ang-(1–7)/PAMAM-OH complex is an efficient delivery method for Ang-(1–7), since it improves the anti-atrophic activity of this peptide in skeletal muscle.
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Affiliation(s)
- Valeria Márquez-Miranda
- Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago; Fundación Fraunhofer Chile Research, Las Condes
| | - Johanna Abrigo
- Departamento de Ciencias Biologicas, Facultad de Ciencias Biologicas & Facultad de Medicina, Universidad Andres Bello; Millennium Institute on Immunology and Immunotherapy, Santiago
| | - Juan Carlos Rivera
- Departamento de Ciencias Biologicas, Facultad de Ciencias Biologicas & Facultad de Medicina, Universidad Andres Bello; Millennium Institute on Immunology and Immunotherapy, Santiago
| | - Ingrid Araya-Durán
- Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago
| | - Javier Aravena
- Departamento de Ciencias Biologicas, Facultad de Ciencias Biologicas & Facultad de Medicina, Universidad Andres Bello; Millennium Institute on Immunology and Immunotherapy, Santiago
| | - Felipe Simon
- Departamento de Ciencias Biologicas, Facultad de Ciencias Biologicas & Facultad de Medicina, Universidad Andres Bello; Millennium Institute on Immunology and Immunotherapy, Santiago
| | - Nicolás Pacheco
- Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago
| | - Fernando Danilo González-Nilo
- Center for Bioinformatics and Integrative Biology (CBIB), Facultad de Ciencias Biologicas, Universidad Andres Bello, Santiago; Fundación Fraunhofer Chile Research, Las Condes; Centro Interdisciplinario de Neurociencia de Valparaíso, Facultad de Ciencias, Universidad de Valparaíso, Valparaíso, Chile
| | - Claudio Cabello-Verrugio
- Departamento de Ciencias Biologicas, Facultad de Ciencias Biologicas & Facultad de Medicina, Universidad Andres Bello; Millennium Institute on Immunology and Immunotherapy, Santiago
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8
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Kutz A, Gröhn F. Improving Photocatalytic Activity: Versatile Polyelectrolyte - Photosensitizer Assemblies for Methyl Viologen Reduction. ChemistrySelect 2017. [DOI: 10.1002/slct.201601844] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Anne Kutz
- Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials; Friedrich-Alexander Universität Erlangen-Nürnberg; Egerlandstraße 3 91058 Erlangen Germany
| | - Franziska Gröhn
- Department of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials; Friedrich-Alexander Universität Erlangen-Nürnberg; Egerlandstraße 3 91058 Erlangen Germany
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9
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Rodríguez J, Martín MJ, Ruiz MA, Clares B. Current encapsulation strategies for bioactive oils: From alimentary to pharmaceutical perspectives. Food Res Int 2016. [DOI: 10.1016/j.foodres.2016.01.032] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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10
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Gurzov EN, Wang B, Pilkington EH, Chen P, Kakinen A, Stanley WJ, Litwak SA, Hanssen EG, Davis TP, Ding F, Ke PC. Inhibition of hIAPP Amyloid Aggregation and Pancreatic β-Cell Toxicity by OH-Terminated PAMAM Dendrimer. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2016; 12:1615-1626. [PMID: 26808649 DOI: 10.1002/smll.201502317] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Revised: 12/17/2015] [Indexed: 06/05/2023]
Abstract
Human islet amyloid polypeptide (hIAPP, or amylin) forms amyloid deposits in the islets of Langerhans, a phenomenon that is associated with type-2 diabetes impacting millions of people worldwide. Accordingly, strategies against hIAPP aggregation are essential for the prevention and eventual treatment of the disease. Here, it is shown that generation-3 OH-terminated poly(amidoamine) dendrimer, a polymeric nanoparticle, can effectively halt the aggregation of hIAPP and shut down hIAPP toxicity in pancreatic MIN6 and NIT-1 cells as well as in mouse islets. This finding is supported by high-throughput dynamic light scattering experiment and thioflavin T assay, where the rapid evolution of hIAPP nucleation and elongation processes is halted by the addition of the dendrimer up to 8 h. Discrete molecular dynamics simulations further reveal that hIAPP residues bound strongly with the dendrimer near the c-terminal portion of the peptide, where the amyloidogenic sequence (residues 22-29) locates. Furthermore, simulations of hIAPP dimerization reveal that binding with the dendrimer significantly reduces formation of interpeptide contacts and hydrogen bonds, thereby prohibiting peptide self-association and amyloidosis. This study points to a promising nanomedicinal strategy for combating type-2 diabetes and may have broader implications for targeting neurological disorders whose distinct hallmark is also amyloid fibrillation.
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Affiliation(s)
- Esteban N Gurzov
- St Vincent's Institute of Medical Research, 9 Princes Street, Fitzroy, VIC, 3065, Australia
- Department of Medicine, St. Vincent's Hospital, The University of Melbourne, Melbourne, Australia
| | - Bo Wang
- Department of Physics and Astronomy, Clemson University, Clemson, SC, 29634, USA
| | - Emily H Pilkington
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC, 3052, Australia
| | - Pengyu Chen
- Department of Mechanical Engineering, University of Michigan, Ann Arbor, MI, 28109, USA
| | - Aleksandr Kakinen
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC, 3052, Australia
| | - William J Stanley
- St Vincent's Institute of Medical Research, 9 Princes Street, Fitzroy, VIC, 3065, Australia
- Department of Medicine, St. Vincent's Hospital, The University of Melbourne, Melbourne, Australia
| | - Sara A Litwak
- St Vincent's Institute of Medical Research, 9 Princes Street, Fitzroy, VIC, 3065, Australia
| | - Eric G Hanssen
- Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, VIC, 3010, Australia
| | - Thomas P Davis
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC, 3052, Australia
- Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, UK
| | - Feng Ding
- Department of Physics and Astronomy, Clemson University, Clemson, SC, 29634, USA
| | - Pu Chun Ke
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC, 3052, Australia
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11
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Nedumpully-Govindan P, Kakinen A, Pilkington EH, Davis TP, Chun Ke P, Ding F. Stabilizing Off-pathway Oligomers by Polyphenol Nanoassemblies for IAPP Aggregation Inhibition. Sci Rep 2016; 6:19463. [PMID: 26763863 PMCID: PMC4725907 DOI: 10.1038/srep19463] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 12/14/2015] [Indexed: 01/09/2023] Open
Abstract
Experimental studies have shown that many naturally occurring polyphenols have inhibitory effect on the aggregation of several proteins. Here, we use discrete molecular dynamics (DMD) simulations and high-throughput dynamic light scattering (DLS) experiments to study the anti-aggregation effects of two polyphenols, curcumin and resveratrol, on the aggregation of islet amyloid polypeptide (IAPP or amylin). Our DMD simulations suggest that the aggregation inhibition is caused by stabilization of small molecular weight IAPP off-pathway oligomers by the polyphenols. Our analysis indicates that IAPP-polyphenol hydrogen bonds and π-π stacking combined with hydrophobic interactions are responsible for the stabilization of oligomers. The presence of small oligomers is confirmed with DLS measurements in which nanometer-sized oligomers are found to be stable for up to 7.5 hours, the time frame within which IAPP aggregates in the absence of polyphenols. Our study offers a general anti-aggregation mechanism for polyphenols, and further provides a computational framework for the future design of anti-amyloid aggregation therapeutics.
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Affiliation(s)
| | - Aleksandr Kakinen
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia
| | - Emily H Pilkington
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia
| | - Thomas P Davis
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia.,Department of Chemistry, University of Warwick, Gibbet Hill, Coventry, CV4 7AL, United Kingdom
| | - Pu Chun Ke
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia
| | - Feng Ding
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, USA
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12
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Yu C, Ma L, Li K, Li S, Liu Y, Zhou Y, Yan D. Molecular dynamics simulation studies of hyperbranched polyglycerols and their encapsulation behaviors of small drug molecules. Phys Chem Chem Phys 2016; 18:22446-57. [DOI: 10.1039/c6cp03726g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Computer simulation could disclose more details about the conformations of HPGs and their encapsulation behaviors of guest molecules.
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Affiliation(s)
- Chunyang Yu
- School of Chemistry & Chemical Engineering
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Li Ma
- School of Chemistry & Chemical Engineering
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Ke Li
- School of Chemistry & Chemical Engineering
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Shanlong Li
- School of Chemistry & Chemical Engineering
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Yannan Liu
- School of Chemistry & Chemical Engineering
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Yongfeng Zhou
- School of Chemistry & Chemical Engineering
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
| | - Deyue Yan
- School of Chemistry & Chemical Engineering
- State Key Laboratory of Metal Matrix Composites
- Shanghai Jiao Tong University
- Shanghai
- P. R. China
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13
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Mekuria SL, Debele TA, Tsai HC. PAMAM dendrimer based targeted nano-carrier for bio-imaging and therapeutic agents. RSC Adv 2016. [DOI: 10.1039/c6ra12895e] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
In the last several decades, researchers have focused on developing suitable drug carriers to deliver pharmaceutical agents to treat cancer diseases.
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Affiliation(s)
- Shewaye Lakew Mekuria
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 106
- Republic of China
| | - Tilahun Ayane Debele
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 106
- Republic of China
| | - Hsieh-Chih Tsai
- Graduate Institute of Applied Science and Technology
- National Taiwan University of Science and Technology
- Taipei 106
- Republic of China
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14
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Chanphai P, Bekale L, Tajmir-Riahi H. Conjugation of steroids with PAMAM nanoparticles. Colloids Surf B Biointerfaces 2015; 136:1035-41. [DOI: 10.1016/j.colsurfb.2015.10.042] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 10/25/2015] [Accepted: 10/27/2015] [Indexed: 12/30/2022]
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15
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Proctor EA, Dokholyan NV. Applications of Discrete Molecular Dynamics in biology and medicine. Curr Opin Struct Biol 2015; 37:9-13. [PMID: 26638022 DOI: 10.1016/j.sbi.2015.11.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Revised: 10/28/2015] [Accepted: 11/05/2015] [Indexed: 11/27/2022]
Abstract
Discrete Molecular Dynamics (DMD) is a physics-based simulation method using discrete energetic potentials rather than traditional continuous potentials, allowing microsecond time scale simulations of biomolecular systems to be performed on personal computers rather than supercomputers or specialized hardware. With the ongoing explosion in processing power even in personal computers, applications of DMD have similarly multiplied. In the past two years, researchers have used DMD to model structures of disease-implicated protein folding intermediates, study assembly of protein complexes, predict protein-protein binding conformations, engineer rescue mutations in disease-causative protein mutants, design a protein conformational switch to control cell signaling, and describe the behavior of polymeric dispersants for environmental cleanup of oil spills, among other innovative applications.
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Affiliation(s)
- Elizabeth A Proctor
- Department of Biological Engineering, Massachusetts Institute of Technology, United States.
| | - Nikolay V Dokholyan
- Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, United States.
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16
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DeFever RS, Geitner NK, Bhattacharya P, Ding F, Ke PC, Sarupria S. PAMAM dendrimers and graphene: materials for removing aromatic contaminants from water. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:4490-4497. [PMID: 25786141 DOI: 10.1021/es505518r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present results from experiments and atomistic molecular dynamics simulations on the remediation of naphthalene by polyamidoamine (PAMAM) dendrimers and graphene oxide (GrO). Specifically, we investigate 3rd-6th generation (G3-G6) PAMAM dendrimers and GrO with different levels of oxidation. The work is motivated by the potential applications of these emerging nanomaterials in removing polycyclic aromatic hydrocarbon contaminants from water. Our experimental results indicate that GrO outperforms dendrimers in removing naphthalene from water. Molecular dynamics simulations suggest that the prominent factors driving naphthalene association to these seemingly disparate materials are similar. Interestingly, we find that cooperative interactions between the naphthalene molecules play a significant role in enhancing their association to the dendrimers and GrO. Our findings highlight that while selection of appropriate materials is important, the interactions between the contaminants themselves can also be important in governing the effectiveness of a given material. The combined use of experiments and molecular dynamics simulations allows us to comment on the possible factors resulting in better performance of GrO in removing polyaromatic contaminants from water.
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Affiliation(s)
- Ryan S DeFever
- †Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634, United States
| | - Nicholas K Geitner
- ‡Center for Environmental Implications of Nanotechnology and Department of Civil and Environmental Engineering, Duke University, Durham, North Carolina 27708, United States
| | - Priyanka Bhattacharya
- §Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MSIN K2-44, Richland, Washington 99354, United States
| | - Feng Ding
- ∥Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, United States
| | - Pu Chun Ke
- ⊥ARC Center of Excellence in Convergent Bio-Nano Science and Technology, Monash University, 381 Royal Parade, Parkville, Victoria 3052, Australia
| | - Sapna Sarupria
- †Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina 29634, United States
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17
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Wu Y, Li J, Liang W, Yang J, Sun J, Wang H, Liu X, Xu B, Huang W. Hyperbranched fluorene-alt-carbazole copolymers with spiro[3.3]heptane-2,6-dispirofluorene as the core and their application in white polymer light-emitting devices. RSC Adv 2015. [DOI: 10.1039/c5ra05713b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A potential hyperbranched structure with 2,7-fluorene-alt-3,6-carbazole and 4,7-dithienyl-2,1,3-benzothiadiazole branches, and a three-dimensional-structured spiro[3.3]heptane-2,6-dispirofluorene core is synthesized for efficient and stable WPLEDs.
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Affiliation(s)
- Yuling Wu
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Jie Li
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Wenqing Liang
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Junli Yang
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Jing Sun
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Hua Wang
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Xuguang Liu
- College of Chemistry and Chemical Engineering
- Taiyuan University of Technology
- Taiyuan
- China
| | - Bingshe Xu
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Wei Huang
- Key Laboratory for Organic Electronics & Information Displays (KLOEID)
- Institute of Advanced Materials
- Nanjing University of Posts and Telecommunications (NUPT)
- Nanjing
- China
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18
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Wu Y, Li J, Liang W, Yang J, Sun J, Wang H, Liu X, Xu B, Huang W. Fluorene-based hyperbranched copolymers with spiro[3.3]heptane-2,6-dispirofluorene as the conjugation-uninterrupted branching point and their application in WPLEDs. NEW J CHEM 2015. [DOI: 10.1039/c5nj00667h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Spiro[3.3]heptane-2,6-dispirofluorene as a three-dimensional, conjugation-uninterrupted branching point helps to enhance the electroluminescent performance of polyfluorene-based white-light-emitting hyperbranched copolymers.
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Affiliation(s)
- Yuling Wu
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Jie Li
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Wenqing Liang
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Junli Yang
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Jing Sun
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Hua Wang
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Xuguang Liu
- College of Chemistry and Chemical Engineering
- Taiyuan University of Technology
- Taiyuan
- China
| | - Bingshe Xu
- Key Laboratory of Interface Science and Engineering in Advanced Materials
- Taiyuan University of Technology
- Taiyuan
- China
- Research Center of Advanced Materials Science and Technology
| | - Wei Huang
- Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials
- Nanjing University of Posts and Telecommunications (NUPT)
- Nanjing
- China
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