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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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Ivask A, Pilkington EH, Blin T, Käkinen A, Vija H, Visnapuu M, Quinn JF, Whittaker MR, Qiao R, Davis TP, Ke PC, Voelcker NH. Uptake and transcytosis of functionalized superparamagnetic iron oxide nanoparticles in an in vitro blood brain barrier model. Biomater Sci 2018; 6:314-323. [PMID: 29239410 DOI: 10.1039/c7bm01012e] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Two major hurdles in nanomedicine are the limited strategies for synthesizing stealth nanoparticles and the poor efficacy of the nanoparticles in translocating across the blood brain barrier (BBB). Here we examined the uptake and transcytosis of iron oxide nanoparticles (IONPs) grafted with biomimetic phosphorylcholine (PC) brushes in an in vitro BBB model system, and compared them with bare, PEG or PC-PEG mixture grafted IONPs. Hyperspectral imaging indicated IONP co-localization with cells. Quantitative analysis with total reflection X-ray fluorescence spectrometry showed that after 24 h, 78% of PC grafted, 68-69% of PEG or PC-PEG grafted, and 30% of bare IONPs were taken up by the BBB. Transcytosis of IONPs was time-dependent and after 24 h, 16-17% of PC or PC-PEG mixture grafted IONPs had passed the BBB model, significantly more than PEG grafted or bare IONPs. These findings point out that grafting of IONPs with PC is a viable strategy for improving the uptake and transcytosis of nanoparticles.
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Affiliation(s)
- Angela Ivask
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Future Industries Institute, University of South Australia, Mawson Lakes, SA, Australia
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Allen RP, Bolandparvaz A, Ma JA, Manickam VA, Lewis JS. Latent, Immunosuppressive Nature of Poly(lactic- co-glycolic acid) Microparticles. ACS Biomater Sci Eng 2018; 4:900-918. [PMID: 30555893 PMCID: PMC6290919 DOI: 10.1021/acsbiomaterials.7b00831] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Use of biomaterials to spatiotemporally control the activation of immune cells is at the forefront of biomedical engineering research. As more biomaterial strategies are employed for immunomodulation, understanding the immunogenicity of biodegradable materials and their byproducts is paramount in tailoring systems for immune activation or suppression. Poly(D,L-lactic-co-glycolic acid) (PLGA), one of the most commonly studied polymers in tissue engineering and drug delivery, has been previously described on one hand as an immune adjuvant, and on the other as a nonactivating material. In this study, the effect of PLGA microparticles (MPs) on the maturation status of murine bone marrow-derived dendritic cells (DCs), the primary initiators of adaptive immunity, was investigated to decipher the immunomodulatory properties of this biomaterial. Treatment of bone marrow-derived DCs from C57BL/6 mice with PLGA MPs led to a time dependent decrease in the maturation level of these cells, as quantified by decreased expression of the positive stimulatory molecules MHCII, CD80, and CD86 as well as the ability to resist maturation following challenge with lipopolysaccharide (LPS). Moreover, this immunosuppression was dependent on the molecular weight of the PLGA used to fabricate the MPs, as higher molecular weight polymers required longer incubation to produce comparable dampening of maturation molecules. These phenomena were correlated to an increase in lactic acid both intracellularly and extracellularly during DC/PLGA MP coculture, which is postulated to be the primary agent behind the observed immune inhibition. This hypothesis is supported by our results demonstrating that resistance to LPS stimulation may be due to the ability of PLGA MP-derived lactic acid to inhibit the phosphorylation of TAK1 and therefore prevent NF-κB activation. This work is significant as it begins to elucidate how PLGA, a prominent biomaterial with broad applications ranging from tissue engineering to pharmaceutics, could modulate the local immune environment and offers insight on engineering PLGA to exploit its evolving immunogenicity.
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Affiliation(s)
- Riley P. Allen
- Department of Biomedical Engineering, University of California Davis, 1 Shields Avenue, Davis, California 95616, United States
| | - Amir Bolandparvaz
- Department of Biomedical Engineering, University of California Davis, 1 Shields Avenue, Davis, California 95616, United States
| | - Jeffrey A. Ma
- Department of Biomedical Engineering, University of California Davis, 1 Shields Avenue, Davis, California 95616, United States
| | - Vishal A. Manickam
- Department of Biomedical Engineering, University of California Davis, 1 Shields Avenue, Davis, California 95616, United States
| | - Jamal S. Lewis
- Department of Biomedical Engineering, University of California Davis, 1 Shields Avenue, Davis, California 95616, United States
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Chen L, Lv S, Gao Z, Chen C. Voltammetric immunoassay for the carcinoembryonic antigen by using a glassy carbon electrode modified with poly(3,4-ethylenedioxythiophene) doped with tannic acid and grafted with poly(ethylene glycol). Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2502-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Wang B, Blin T, Käkinen A, Ge X, Pilkington EH, Quinn JF, Whittaker MR, Davis TP, Ke PC, Ding F. Brushed polyethylene glycol and phosphorylcholine for grafting nanoparticles against protein binding. Polym Chem 2016; 7:6875-6879. [PMID: 28348639 PMCID: PMC5365087 DOI: 10.1039/c6py01480a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
To provide a molecular insight for guiding polymer coating in surface science and nanotechnology, here we examined the structures of brushed polyethylene glycol(bPEG)- and phosphorylcholine(bPC)-grafted iron oxide nanoparticles and analyzed their protein avoiding properties. We show bPC as an advantageous biomimetic alternative to PEG in rendering stealth nanostructures.
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Affiliation(s)
- Bo Wang
- Department of Physics and Astronomy, Clemson University, Clemson, SC, USA
| | - Thomas Blin
- 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
| | - Aleksandr Käkinen
- 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
| | - Xinwei Ge
- Department of Physics and Astronomy, Clemson University, Clemson, SC, 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
| | - John F. Quinn
- 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
| | - Michael R. Whittaker
- 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, USA
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Herrera Estrada L, Padmore TJ, Champion JA. Bacterial Effector Nanoparticles as Breast Cancer Therapeutics. Mol Pharm 2016; 13:710-9. [DOI: 10.1021/acs.molpharmaceut.5b00377] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Lina Herrera Estrada
- Department of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 950 Atlantic Drive NW, Atlanta, Georgia 30332, United States
| | - Trudy J. Padmore
- Department of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 950 Atlantic Drive NW, Atlanta, Georgia 30332, United States
| | - Julie A. Champion
- Department of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 950 Atlantic Drive NW, Atlanta, Georgia 30332, United States
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Blin T, Kakinen A, Pilkington EH, Ivask A, Ding F, Quinn JF, Whittaker MR, Ke PC, Davis TP. Synthesis and in vitro properties of iron oxide nanoparticles grafted with brushed phosphorylcholine and polyethylene glycol. Polym Chem 2016. [DOI: 10.1039/c5py02024g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A new and facile strategy for grafting IONPs by phosphonic acic terminated PC brushes has been demonstrated and characterized in vitro.
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Affiliation(s)
- Thomas Blin
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - Aleksandr Kakinen
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - Emily H. Pilkington
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - Angela Ivask
- Future Industries Institute
- University of South Australia
- Mawson Lakes
- Australia
| | - Feng Ding
- Department of Physics and Astronomy
- Clemson University
- Clemson
- USA
| | - John F. Quinn
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - Michael R. Whittaker
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - Pu Chun Ke
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
| | - Thomas P. Davis
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology
- Monash Institute of Pharmaceutical Sciences
- Monash University
- Parkville
- Australia
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