51
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Dallavalle M, Calvaresi M, Bottoni A, Melle-Franco M, Zerbetto F. Graphene can wreak havoc with cell membranes. ACS APPLIED MATERIALS & INTERFACES 2015; 7:4406-14. [PMID: 25648559 DOI: 10.1021/am508938u] [Citation(s) in RCA: 102] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Molecular dynamics--coarse grained to the level of hydrophobic and hydrophilic interactions--shows that small hydrophobic graphene sheets pierce through the phospholipid membrane and navigate the double layer, intermediate size sheets pierce the membrane only if a suitable geometric orientation is met, and larger sheets lie mainly flat on the top of the bilayer where they wreak havoc with the membrane and create a patch of upturned phospholipids. The effect arises in order to maximize the interaction between hydrophobic moieties and is quantitatively explained in terms of flip-flops by the analysis of the simulations. Possible severe biological consequences are discussed.
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Affiliation(s)
- Marco Dallavalle
- Dipartimento di Chimica "G. Ciamician", Alma Mater Studiorum-Università di Bologna , via F. Selmi 2, 40126 Bologna, Italy
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52
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Nikolov SV, Yeh PD, Alexeev A. Self-Propelled Microswimmer Actuated by Stimuli-Sensitive Bilayered Hydrogel. ACS Macro Lett 2015; 4:84-88. [PMID: 35596378 DOI: 10.1021/mz5007014] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Using computational modeling, we design a microscopic swimmer made of a bilayered responsive hydrogel capable of swimming in a viscous fluid when actuated by a periodically applied stimulus. The gel has an X-shaped geometry and two bonded layers, one of which is responsive to environmental changes and the other which is passive. When the stimulus is turned on, the responsive layer swells and causes the swimmer to deform. We demonstrate that when such stimulus-induced deformations occur periodically the gel swimmer effectively propels forward through the fluid. We show that the swimming speed depends on the relative stiffness of the two gel layers composing the swimmer, and we determine the optimal stiffness ratio that maximizes the swimming speed.
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Affiliation(s)
- Svetoslav V. Nikolov
- George W. Woodruff School
of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States
| | - Peter D. Yeh
- George W. Woodruff School
of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States
| | - Alexander Alexeev
- George W. Woodruff School
of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0405, United States
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53
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Yeh PD, Alexeev A. Mesoscale modelling of environmentally responsive hydrogels: emerging applications. Chem Commun (Camb) 2015; 51:10083-95. [DOI: 10.1039/c5cc01027f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We review recent advances in mesoscale computational modeling, focusing on dissipative particle dynamics, used to probe stimuli-sensitive behavior of hydrogels.
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Affiliation(s)
- Peter D. Yeh
- George W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- USA
| | - Alexander Alexeev
- George W. Woodruff School of Mechanical Engineering
- Georgia Institute of Technology
- USA
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54
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Dubbert J, Honold T, Pedersen JS, Radulescu A, Drechsler M, Karg M, Richtering W. How Hollow Are Thermoresponsive Hollow Nanogels? Macromolecules 2014. [DOI: 10.1021/ma502056y] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Janine Dubbert
- Institute
of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany
| | - Tobias Honold
- Physical
Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
| | - Jan Skov Pedersen
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, 8000 Aarhus, Denmark
| | - Aurel Radulescu
- Jülich
Centre for Neutron Science, Outstation at MLZ, 85747 Garching, Germany
| | - Markus Drechsler
- Physical
Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
| | - Matthias Karg
- Physical
Chemistry I, University of Bayreuth, 95440 Bayreuth, Germany
| | - Walter Richtering
- Institute
of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany
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55
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Brown AC, Stabenfeldt SE, Ahn B, Hannan RT, Dhada KS, Herman ES, Stefanelli V, Guzzetta N, Alexeev A, Lam WA, Lyon LA, Barker TH. Ultrasoft microgels displaying emergent platelet-like behaviours. NATURE MATERIALS 2014; 13:1108-1114. [PMID: 25194701 PMCID: PMC4239187 DOI: 10.1038/nmat4066] [Citation(s) in RCA: 161] [Impact Index Per Article: 16.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 07/25/2014] [Indexed: 05/19/2023]
Abstract
Efforts to create platelet-like structures for the augmentation of haemostasis have focused solely on recapitulating aspects of platelet adhesion; more complex platelet behaviours such as clot contraction are assumed to be inaccessible to synthetic systems. Here, we report the creation of fully synthetic platelet-like particles (PLPs) that augment clotting in vitro under physiological flow conditions and achieve wound-triggered haemostasis and decreased bleeding times in vivo in a traumatic injury model. PLPs were synthesized by combining highly deformable microgel particles with molecular-recognition motifs identified through directed evolution. In vitro and in silico analyses demonstrate that PLPs actively collapse fibrin networks, an emergent behaviour that mimics in vivo clot contraction. Mechanistically, clot collapse is intimately linked to the unique deformability and affinity of PLPs for fibrin fibres, as evidenced by dissipative particle dynamics simulations. Our findings should inform the future design of a broader class of dynamic, biosynthetic composite materials.
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Affiliation(s)
- Ashley C. Brown
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta GA 30332
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332
| | - Sarah E. Stabenfeldt
- School of Biological and Health Systems Engineering, Arizona State University, Tempe, Arizona 85287
| | - Byungwook Ahn
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta GA 30332
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Aflac Cancer Center and Blood Disorders Service of Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Riley T. Hannan
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta GA 30332
| | - Kabir S. Dhada
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332
| | - Emily S. Herman
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332
| | - Victoria Stefanelli
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta GA 30332
| | - Nina Guzzetta
- Department of Pediatrics, Division of Pediatric Cardiology, Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Alexander Alexeev
- The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332
| | - Wilbur A. Lam
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta GA 30332
- Department of Pediatrics, Division of Pediatric Hematology/Oncology, Aflac Cancer Center and Blood Disorders Service of Children's Healthcare of Atlanta, Emory University School of Medicine, Atlanta, Georgia, USA
- The Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta, GA 30332
| | - L. Andrew Lyon
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332
- The Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta, GA 30332
| | - Thomas H. Barker
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta GA 30332
- The Parker H. Petit Institute for Bioengineering and Biosciences, Georgia Institute of Technology, Atlanta, GA 30332
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56
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Aydin F, Ludford P, Dutt M. Phase segregation in bio-inspired multi-component vesicles encompassing double tail phospholipid species. SOFT MATTER 2014; 10:6096-6108. [PMID: 25008809 DOI: 10.1039/c4sm00998c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Our aim is to investigate the phase segregation and the structure of multi-component bio-inspired phospholipid vesicles via dissipative particle dynamics. The chemical distinction in the phospholipid species arises due to different head and tail group moieties, and molecular stiffness of the hydrocarbon tails. The individual amphiphilic phospholipid molecular species are represented by a hydrophilic head group and two hydrophobic tails. The distinct chemical nature of the moieties is modeled effectively via soft repulsive interaction parameters, and the molecular rigidity is tuned via suitable three-body potential constants. We demonstrate the formation of a stable hybrid vesicle through the self-assembly of the amphiphilic phospholipid molecules in the presence of a hydrophilic solvent. We investigate and characterize the phase segregation and the structure of the binary vesicles for different phospholipid mixtures. Our results demonstrate macroscopic phase separation for phospholipid mixtures composed of species with different hydrocarbon tail groups. We also investigate the relationship between the phase segregation and thermodynamic variables such as interfacial line tension and surface tension, and obtain correspondence between existing theory and experiments, and our simulation results. We report variations in the molecular chain stiffness to have negligible contributions to the phase segregation in the mixed bilayer, and to demonstrate shape transformations of the hybrid vesicle. Our results can be used to design novel bio-inspired hybrid vehicles for potential applications in biomedicine, sensing, imaging and sustainability.
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Affiliation(s)
- Fikret Aydin
- Department of Chemical Engineering, Rutgers The State University of New Jersey, Piscataway, NJ 08854, USA.
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57
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Feng C, Zhang C, Kong F, Wang J. Synthesis of thiodiazole copper microcapsules and release behavior of inhibiting R. solanacearum. RSC Adv 2014. [DOI: 10.1039/c3ra45744c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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58
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Zhang L, Li Y, Yu JC. Chemical modification of inorganic nanostructures for targeted and controlled drug delivery in cancer treatment. J Mater Chem B 2014; 2:452-470. [DOI: 10.1039/c3tb21196g] [Citation(s) in RCA: 93] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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59
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60
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61
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Song J, Fang Z, Wang C, Zhou J, Duan B, Pu L, Duan H. Photolabile plasmonic vesicles assembled from amphiphilic gold nanoparticles for remote-controlled traceable drug delivery. NANOSCALE 2013; 5:5816-5824. [PMID: 23689945 DOI: 10.1039/c3nr01350b] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We have developed a new type of photo-responsive plasmonic vesicles that allow for active delivery of anticancer payloads to specific cancer cells and personalized drug release regulated by external photo-irradiation. Our results show that amphiphilic gold nanoparticles carrying hydrophilic poly(ethylene glycol) (PEG) and photo-responsive hydrophobic poly(2-nitrobenzyl acrylate) (PNBA) can assemble into plasmonic vesicles with gold nanoparticles embedded in the hydrophobic shell of PNBA, which can be converted into hydrophilic poly(acrylic acid) upon photo exposure. Benefiting from the interparticle plasmonic coupling of gold nanoparticles in close proximity, the plasmonic vesicles assembled from amphiphilic gold nanoparticles exhibit distinctively different optical properties from single nanoparticle units, which offer the opportunity to track the photo-triggered disassembly of the vesicles and the associated cargo release by plasmonic imaging. We have shown the dense layer of PEG grafts on the vesicles not only endow plasmonic vesicles with excellent colloidal stability, but also serve as flexible spacers for bioconjugation of targeting ligands to facilitate the specific recognition of cancer cells. The targeted delivery of model anticancer drug doxorubicin, investigated by dual-modality plasmonic and fluorescence imaging and toxicity studies, clearly demonstrated the potential of photolabile plasmonic vesicles as multi-functional drug carriers.
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Affiliation(s)
- Jibin Song
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 70 Nanyang Drive, 637457 Singapore
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62
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Mesoscale modeling: solving complex flows in biology and biotechnology. Trends Biotechnol 2013; 31:426-34. [DOI: 10.1016/j.tibtech.2013.05.001] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2013] [Revised: 05/03/2013] [Accepted: 05/04/2013] [Indexed: 11/24/2022]
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63
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Yashchenok A, Parakhonskiy B, Donatan S, Kohler D, Skirtach A, Möhwald H. Polyelectrolyte multilayer microcapsules templated on spherical, elliptical and square calcium carbonate particles. J Mater Chem B 2013; 1:1223-1228. [DOI: 10.1039/c2tb00416j] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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64
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Palankar R, Pinchasik BE, Schmidt S, De Geest BG, Fery A, Möhwald H, Skirtach AG, Delcea M. Mechanical strength and intracellular uptake of CaCO3-templated LbL capsules composed of biodegradable polyelectrolytes: the influence of the number of layers. J Mater Chem B 2013; 1:1175-1181. [DOI: 10.1039/c2tb00319h] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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65
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Marchenko I, Yashchenok A, Borodina T, Bukreeva T, Konrad M, Möhwald H, Skirtach A. Controlled enzyme-catalyzed degradation of polymeric capsules templated on CaCO₃: influence of the number of LbL layers, conditions of degradation, and disassembly of multicompartments. J Control Release 2012; 162:599-605. [PMID: 22902593 DOI: 10.1016/j.jconrel.2012.08.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2012] [Revised: 08/01/2012] [Accepted: 08/04/2012] [Indexed: 11/18/2022]
Abstract
Enzyme-catalyzed degradation of CaCO₃-templated capsules is presented. We investigate a) biodegradable, b) mixed biodegradable/synthetic, and c) multicompartment polyelectrolyte multilayer capsules with different numbers of polymer layers. Using confocal laser scanning microscopy we observed the kinetics of the non-specific protease Pronase-induced degradation of capsules is slowed down on the order of hours by either increasing the number of layers in the wall of biodegradable capsules, or by inserting synthetic polyelectrolyte multilayers into the shell comprised of biodegradable polymers. The degradation rate increases with the concentration of Pronase. Controlled detachment of subcompartments of multicompartment capsules, with potential for intracellular delivery or in-vivo applications, is also shown.
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Affiliation(s)
- Irina Marchenko
- Institute of Crystallography, Russian Academy of Sciences, Moscow 119333, Russia
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66
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Sun YL, Yang BJ, Zhang SXA, Yang YW. Cucurbit[7]uril Pseudorotaxane-Based Photoresponsive Supramolecular Nanovalve. Chemistry 2012; 18:9212-6. [DOI: 10.1002/chem.201201083] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Indexed: 11/11/2022]
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