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Ramalhete L, Araújo R, Ferreira A, Calado CRC. Exosomes and microvesicles in kidney transplantation: the long road from trash to gold. Pathology 2024; 56:1-10. [PMID: 38071158 DOI: 10.1016/j.pathol.2023.10.004] [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: 12/21/2022] [Revised: 09/26/2023] [Accepted: 10/19/2023] [Indexed: 01/24/2024]
Abstract
Kidney transplantation significantly enhances the survival rate and quality of life of patients with end-stage kidney disease. The ability to predict post-transplantation rejection events in their early phases can reduce subsequent allograft loss. Therefore, it is critical to identify biomarkers of rejection processes that can be acquired on routine analysis of samples collected by non-invasive or minimally invasive procedures. It is also important to develop new therapeutic strategies that facilitate optimisation of the dose of immunotherapeutic drugs and the induction of allograft immunotolerance. This review explores the challenges and opportunities offered by extracellular vesicles (EVs) present in biofluids in the discovery of biomarkers of rejection processes, as drug carriers and in the induction of immunotolerance. Since EVs are highly complex structures and their composition is affected by the parent cell's metabolic status, the importance of defining standardised methods for isolating and characterising EVs is also discussed. Understanding the major bottlenecks associated with all these areas will promote the further investigation of EVs and their translation into a clinical setting.
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Affiliation(s)
- Luis Ramalhete
- Blood and Transplantation Center of Lisbon, Instituto Português do Sangue e da Transplantação, Alameda das Linhas de Torres, Lisbon, Portugal; NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal; iNOVA4Health - Advancing Precision Medicine, RG11: Reno-Vascular Diseases Group, NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal.
| | - Ruben Araújo
- NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal
| | - Aníbal Ferreira
- NOVA Medical School, Faculdade de Ciências Médicas, Universidade NOVA de Lisboa, Lisbon, Portugal; Centro Hospitalar Universitário Lisboa Central, Hospital Curry Cabral, Serviço de Nefrologia, NOVA Medical School, Lisbon, Portugal
| | - Cecília R C Calado
- ISEL - Instituto Superior de Engenharia de Lisboa, Instituto Politécnico de Lisboa, R. Conselheiro Emídio Navarro 1, Lisbon, Portugal; CIMOSM - Centro de Investigação em Modelação e Otimização de Sistemas Multifuncionais, Lisbon, Portugal
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2
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Xu R, Liu Y, Yang Z, Jiang Q, Zhang Y, Wang J. Application of calibrated and reusable probes on a home-made scanning probe microscope platform. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:013702. [PMID: 38206098 DOI: 10.1063/5.0169091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2023] [Accepted: 12/19/2023] [Indexed: 01/12/2024]
Abstract
The replacement of an Atomic Force Microscope (AFM) probe is inevitable due to blunting or contamination of its tip during usage. The fabrication of AFM probes is a complex and costly process, and the mechanical properties of these probes need to be calibrated due to material defects before use, making this procedure intricate. Taking inspiration from the Wollaston probe, we have developed a T-shaped tungsten probe and installed it into a home-made scanning probe microscope. The normal stiffness coefficient of this probe can be determined by gradually eroding the tip and altering the probe mass, resulting in a change in resonance frequency. We assess the reliability of this probe by comparing its scanning topography with that of a commercially available AFM. Furthermore, we investigate the wear resistance of the probe and demonstrate the effectiveness of re-corrosion sharpening after passivation, which yields scanning results equivalent to those obtained with a new probe.
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Affiliation(s)
- Rui Xu
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
| | - Yi Liu
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
| | - Zhimu Yang
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
| | - Qinmeng Jiang
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
| | - Yanhui Zhang
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
| | - Jianli Wang
- Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Department of Mechanical Engineering, Southeast University, Nanjing 210096, China
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Huang W, Hua MZ, Li S, Chen K, Lu X, Wu D. Application of atomic force microscopy in the characterization of fruits and vegetables and associated substances toward improvement in quality, preservation, and processing: nanoscale structure and mechanics perspectives. Crit Rev Food Sci Nutr 2023:1-29. [PMID: 37585698 DOI: 10.1080/10408398.2023.2242944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023]
Abstract
Fruits and vegetables are essential horticultural crops for humans. The quality of fruits and vegetables is critical in determining their nutritional value and edibility, which are decisive to their commercial value. Besides, it is also important to understand the changes in key substances involved in the preservation and processing of fruits and vegetables. Atomic force microscopy (AFM), a powerful technique for investigating biological surfaces, has been widely used to characterize the quality of fruits and vegetables and the substances involved in their preservation and processing from the perspective of nanoscale structure and mechanics. This review summarizes the applications of AFM to investigate the texture, appearance, and nutrients of fruits and vegetables based on structural imaging and force measurements. Additionally, the review highlights the application of AFM in characterizing the morphological and mechanical properties of nanomaterials involved in preserving and processing fruits and vegetables, including films and coatings for preservation, bioactive compounds for processing purposes, nanofiltration membrane for concentration, and nanoencapsulation for delivery of bioactive compounds. Furthermore, the strengths and weaknesses of AFM for characterizing the quality of fruits and vegetables and the substances involved in their preservation and processing are examined, followed by a discussion on the prospects of AFM in this field.
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Affiliation(s)
- Weinan Huang
- College of Agriculture and Biotechnology/Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology/Key Laboratory of Ministry of Agriculture and Rural Affairs of Biology and Genetic Improvement of Horticultural Crops (Growth and Development), Zhejiang University, Hangzhou, P. R. China
- Zhongyuan Institute, Zhejiang University, Zhengzhou, P. R. China
| | - Marti Z Hua
- Department of Food Science and Agricultural Chemistry, McGill University, Quebec, Canada
| | - Shenmiao Li
- Department of Food Science and Agricultural Chemistry, McGill University, Quebec, Canada
| | - Kunsong Chen
- College of Agriculture and Biotechnology/Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology/Key Laboratory of Ministry of Agriculture and Rural Affairs of Biology and Genetic Improvement of Horticultural Crops (Growth and Development), Zhejiang University, Hangzhou, P. R. China
- Zhongyuan Institute, Zhejiang University, Zhengzhou, P. R. China
| | - Xiaonan Lu
- Department of Food Science and Agricultural Chemistry, McGill University, Quebec, Canada
| | - Di Wu
- College of Agriculture and Biotechnology/Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology/Key Laboratory of Ministry of Agriculture and Rural Affairs of Biology and Genetic Improvement of Horticultural Crops (Growth and Development), Zhejiang University, Hangzhou, P. R. China
- Zhongyuan Institute, Zhejiang University, Zhengzhou, P. R. China
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4
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Maksudov F, Kliuchnikov E, Marx KA, Purohit PK, Barsegov V. Mechanical fatigue testing in silico: Dynamic evolution of material properties of nanoscale biological particles. Acta Biomater 2023; 166:326-345. [PMID: 37142109 DOI: 10.1016/j.actbio.2023.04.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 04/01/2023] [Accepted: 04/26/2023] [Indexed: 05/06/2023]
Abstract
Biological particles have evolved to possess mechanical characteristics necessary to carry out their functions. We developed a computational approach to "fatigue testing in silico", in which constant-amplitude cyclic loading is applied to a particle to explore its mechanobiology. We used this approach to describe dynamic evolution of nanomaterial properties and low-cycle fatigue in the thin spherical encapsulin shell, thick spherical Cowpea Chlorotic Mottle Virus (CCMV) capsid, and thick cylindrical microtubule (MT) fragment over 20 cycles of deformation. Changing structures and force-deformation curves enabled us to describe their damage-dependent biomechanics (strength, deformability, stiffness), thermodynamics (released and dissipated energies, enthalpy, and entropy) and material properties (toughness). Thick CCMV and MT particles experience material fatigue due to slow recovery and damage accumulation over 3-5 loading cycles; thin encapsulin shells show little fatigue due to rapid remodeling and limited damage. The results obtained challenge the existing paradigm: damage in biological particles is partially reversible owing to particle's partial recovery; fatigue crack may or may not grow with each loading cycle and may heal; and particles adapt to deformation amplitude and frequency to minimize the energy dissipated. Using crack size to quantitate damage is problematic as several cracks might form simultaneously in a particle. Dynamic evolution of strength, deformability, and stiffness, can be predicted by analyzing the cycle number (N) dependent damage, [Formula: see text] , where α is a power law and Nf is fatigue life. Fatigue testing in silico can now be used to explore damage-induced changes in the material properties of other biological particles. STATEMENT OF SIGNIFICANCE: Biological particles possess mechanical characteristics necessary to perform their functions. We developed "fatigue testing in silico" approach, which employes Langevin Dynamics simulations of constant-amplitude cyclic loading of nanoscale biological particles, to explore dynamic evolution of the mechanical, energetic, and material properties of the thin and thick spherical particles of encapsulin and Cowpea Chlorotic Mottle Virus, and the microtubule filament fragment. Our study of damage growth and fatigue development challenge the existing paradigm. Damage in biological particles is partially reversible as fatigue crack might heal with each loading cycle. Particles adapt to deformation amplitude and frequency to minimize energy dissipation. The evolution of strength, deformability, and stiffness, can be accurately predicted by analyzing the damage growth in particle structure.
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Affiliation(s)
- Farkhad Maksudov
- Department of Chemistry, University of Massachusetts, Lowell, MA 01854, United States
| | - Evgenii Kliuchnikov
- Department of Chemistry, University of Massachusetts, Lowell, MA 01854, United States
| | - Kenneth A Marx
- Department of Chemistry, University of Massachusetts, Lowell, MA 01854, United States
| | - Prashant K Purohit
- Department of Mechanical Engineering and Applied Mechanics, University of Pennsylvania, PA, United States
| | - Valeri Barsegov
- Department of Chemistry, University of Massachusetts, Lowell, MA 01854, United States.
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5
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Waite JR, Tan SY, Saha H, Sarkar S, Sarkar A. Few-shot deep learning for AFM force curve characterization of single-molecule interactions. PATTERNS (NEW YORK, N.Y.) 2023; 4:100672. [PMID: 36699737 PMCID: PMC9868661 DOI: 10.1016/j.patter.2022.100672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 09/29/2022] [Accepted: 12/07/2022] [Indexed: 01/09/2023]
Abstract
Deep learning (DL)-based analytics has the scope to transform the field of atomic force microscopy (AFM) with regard to fast and bias-free measurement characterization. For example, AFM force-distance curves can help estimate important parameters of binding kinetics, such as the most probable rupture force, binding probability, association, and dissociation constants, as well as receptor density on live cells. Other than the ideal single-rupture event in the force-distance curves, there can be no-rupture, double-rupture, or multiple-rupture events. The current practice is to go through such datasets manually, which can be extremely tedious work for the experimentalists. We address this issue by adopting a few-shot learning approach to build sample-efficient DL models that demonstrate better performance than shallow ML models while matching the performance of moderately trained humans. We also release our AFM force curve dataset and annotations publicly as a benchmark for the research community.
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Affiliation(s)
- Joshua R. Waite
- Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
| | - Sin Yong Tan
- Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
| | - Homagni Saha
- Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
| | - Soumik Sarkar
- Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
| | - Anwesha Sarkar
- Department of Electrical and Computer Engineering, Iowa State University, Ames, IA 50011, USA,Corresponding author
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6
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Chen C, Ibrahim Z, Marchand MF, Piolot T, Kamboj S, Carreiras F, Yamada A, Schanne-Klein MC, Chen Y, Lambert A, Aimé C. Three-Dimensional Collagen Topology Shapes Cell Morphology, beyond Stiffness. ACS Biomater Sci Eng 2022; 8:5284-5294. [PMID: 36342082 DOI: 10.1021/acsbiomaterials.2c00879] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Cellular heterogeneity is associated with many physiological processes, including pathological ones, such as morphogenesis and tumorigenesis. The extracellular matrix (ECM) is a key player in the generation of cellular heterogeneity. Advances in our understanding rely on our ability to provide relevant in vitro models. This requires obtainment of the characteristics of the tissues that are essential for controlling cell fate. To do this, we must consider the diversity of tissues, the diversity of physiological contexts, and the constant remodeling of the ECM along these processes. To this aim, we have fabricated a library of ECM models for reproducing the scaffold of connective tissues and the basement membrane by using different biofabrication routes based on the electrospinning and drop casting of biopolymers from the ECM. Using a combination of electron microscopy, multiphoton imaging, and AFM nanoindentation, we show that we can vary independently protein composition, topology, and stiffness of ECM models. This in turns allows one to generate the in vivo complexity of the phenotypic landscape of ovarian cancer cells. We show that, while this phenotypic shift cannot be directly correlated with a unique ECM feature, the three-dimensional collagen fibril topology patterns cell shape, beyond protein composition and stiffness of the ECM. On this line, this work is a further step toward the development of ECM models recapitulating the constantly remodeled environment that cells face and thus provides new insights for cancer model engineering and drug testing.
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Affiliation(s)
- Changchong Chen
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 24 rue Lhomond, Paris 75005, France
| | - Zeinab Ibrahim
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 24 rue Lhomond, Paris 75005, France
| | - Marion F Marchand
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, 11 Place Marcelin Berthelot, Paris 75231, France
| | - Tristan Piolot
- Center for Interdisciplinary Research in Biology (CIRB), Collège de France, CNRS, INSERM, PSL Research University, 11 Place Marcelin Berthelot, Paris 75231, France
| | - Sahil Kamboj
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe, (EA1391), Groupe Matrice Extracellulaire et Physiopathologie (MECuP), Institut des Matériaux, I-MAT (FD4122), CY Cergy Paris Université, Maison Internationale de la Recherche, Rue Descartes, Neuville sur Oise Cedex 95031, France
| | - Franck Carreiras
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe, (EA1391), Groupe Matrice Extracellulaire et Physiopathologie (MECuP), Institut des Matériaux, I-MAT (FD4122), CY Cergy Paris Université, Maison Internationale de la Recherche, Rue Descartes, Neuville sur Oise Cedex 95031, France
| | - Ayako Yamada
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 24 rue Lhomond, Paris 75005, France
| | - Marie-Claire Schanne-Klein
- Laboratoire d'Optique et Biosciences (LOB), École Polytechnique, CNRS, INSERM, Institut Polytechnique de Paris, Route de Saclay, Palaiseau Cedex 91128, France
| | - Yong Chen
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 24 rue Lhomond, Paris 75005, France
| | - Ambroise Lambert
- Equipe de Recherche sur les Relations Matrice Extracellulaire-Cellules, ERRMECe, (EA1391), Groupe Matrice Extracellulaire et Physiopathologie (MECuP), Institut des Matériaux, I-MAT (FD4122), CY Cergy Paris Université, Maison Internationale de la Recherche, Rue Descartes, Neuville sur Oise Cedex 95031, France
| | - Carole Aimé
- PASTEUR, Département de Chimie, École Normale Supérieure, PSL University, Sorbonne Université, CNRS, 24 rue Lhomond, Paris 75005, France
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Wani SUD, Zargar MI, Masoodi MH, Alshehri S, Alam P, Ghoneim MM, Alshlowi A, Shivakumar HG, Ali M, Shakeel F. Silk Fibroin as an Efficient Biomaterial for Drug Delivery, Gene Therapy, and Wound Healing. Int J Mol Sci 2022; 23:ijms232214421. [PMID: 36430901 PMCID: PMC9692988 DOI: 10.3390/ijms232214421] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2022] [Revised: 11/14/2022] [Accepted: 11/15/2022] [Indexed: 11/22/2022] Open
Abstract
Silk fibroin (SF), an organic material obtained from the cocoons of a silkworm Bombyx mori, is used in several applications and has a proven track record in biomedicine owing to its superior compatibility with the human body, superb mechanical characteristics, and its controllable propensity to decay. Due to its robust biocompatibility, less immunogenic, non-toxic, non-carcinogenic, and biodegradable properties, it has been widely used in biological and biomedical fields, including wound healing. The key strategies for building diverse SF-based drug delivery systems are discussed in this review, as well as the most recent ways for developing functionalized SF for controlled or redirected medicines, gene therapy, and wound healing. Understanding the features of SF and the various ways to manipulate its physicochemical and mechanical properties enables the development of more effective drug delivery devices. Drugs are encapsulated in SF-based drug delivery systems to extend their shelf life and control their release, allowing them to travel further across the bloodstream and thus extend their range of operation. Furthermore, due to their tunable properties, SF-based drug delivery systems open up new possibilities for drug delivery, gene therapy, and wound healing.
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Affiliation(s)
- Shahid Ud Din Wani
- Department of Pharmaceutical Sciences, School of Applied Science and Technology, University of Kashmir, Jammu and Kashmir, Srinagar 190006, India
| | - Mohammed Iqbal Zargar
- Department of Pharmaceutical Sciences, School of Applied Science and Technology, University of Kashmir, Jammu and Kashmir, Srinagar 190006, India
| | - Mubashir Hussain Masoodi
- Department of Pharmaceutical Sciences, School of Applied Science and Technology, University of Kashmir, Jammu and Kashmir, Srinagar 190006, India
| | - Sultan Alshehri
- Department of Pharmaceutical Sciences, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia
- Correspondence: (S.A.); (F.S.)
| | - Prawez Alam
- Department of Pharmacognosy, College of Pharmacy, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | - Mohammed M. Ghoneim
- Department of Pharmacy Practice, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia
| | - Areej Alshlowi
- Department of Pharmacy Practice, College of Pharmacy, AlMaarefa University, Ad Diriyah 13713, Saudi Arabia
| | - H. G. Shivakumar
- Department of Pharmaceutics, College of Pharmacy, JSS Academy of Technical Education, Noida 201301, India
| | - Mohammad Ali
- Department of Pharmacy Practice, East Point College of Pharmacy, Bangalore 560049, India
| | - Faiyaz Shakeel
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
- Correspondence: (S.A.); (F.S.)
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8
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Liu J, Smith S, Wang C. Reversing the Epithelial-Mesenchymal Transition in Metastatic Cancer Cells Using CD146-Targeted Black Phosphorus Nanosheets and a Mild Photothermal Treatment. ACS NANO 2022; 16:3208-3220. [PMID: 35089691 DOI: 10.1021/acsnano.1c11070] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Cancer metastasis leads to most deaths in cancer patients, and the epithelial-mesenchymal transition (EMT) is the key mechanism that endows the cancer cells with strong migratory and invasive abilities. Here, we present a nanomaterial-based approach to reverse the EMT in cancer cells by targeting an EMT inducer, CD146, using engineered black phosphorus nanosheets (BPNSs) and a mild photothermal treatment. We demonstrate this approach can convert highly metastatic, mesenchymal-type breast cancer cells to an epithelial phenotype (i.e., reversing EMT), leading to a complete stoppage of cancer cell migration. By using advanced nanomechanical and super-resolution imaging, complemented by immunoblotting, we validate the phenotypic switch in the cancer cells, as evidenced by the altered actin organization and cell morphology, downregulation of mesenchymal protein markers, and upregulation of epithelial protein markers. We also elucidate the molecular mechanism behind the reversal of EMT. Our results reveal that CD146-targeted BPNSs and a mild photothermal treatment synergistically contribute to EMT reversal by downregulating membrane CD146 and perturbing its downstream EMT-related signaling pathways. Considering CD146 overexpression has been confirmed on the surface of a variety of metastatic, mesenchymal-like cancer cells, this approach could be applicable for treating various cancer metastasis via modulating the phenotype switch in cancer cells.
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Affiliation(s)
- Jinyuan Liu
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology, 501 East St Joseph Street, Rapid City, South Dakota 57701, United States
- BioSystems Networks & Translational Research (BioSNTR), 501 East St Joseph Street, Rapid City, South Dakota 57701, United States
| | - Steve Smith
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology, 501 East St Joseph Street, Rapid City, South Dakota 57701, United States
- BioSystems Networks & Translational Research (BioSNTR), 501 East St Joseph Street, Rapid City, South Dakota 57701, United States
| | - Congzhou Wang
- Nanoscience and Nanoengineering, South Dakota School of Mines and Technology, 501 East St Joseph Street, Rapid City, South Dakota 57701, United States
- BioSystems Networks & Translational Research (BioSNTR), 501 East St Joseph Street, Rapid City, South Dakota 57701, United States
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9
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Mondal B, Thirumalai D, Reddy G. Energy Landscape of Ubiquitin Is Weakly Multidimensional. J Phys Chem B 2021; 125:8682-8689. [PMID: 34319720 DOI: 10.1021/acs.jpcb.1c02762] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Single molecule pulling experiments report time-dependent changes in the extension (X) of a biomolecule as a function of the applied force (f). By fitting the data to one-dimensional analytical models of the energy landscape, we can extract the hopping rates between the folded and unfolded states in two-state folders as well as the height and the location of the transition state (TS). Although this approach is remarkably insightful, there are cases for which the energy landscape is multidimensional (catch bonds being the most prominent). To assess if the unfolding energy landscape in small single domain proteins could be one-dimensional, we simulated force-induced unfolding of ubiquitin (Ub) using the coarse-grained self-organized polymer-side chain (SOP-SC) model. Brownian dynamics simulations using the SOP-SC model reveal that the Ub energy landscape is weakly multidimensional (WMD), governed predominantly by a single barrier. The unfolding pathway is confined to a narrow reaction pathway that could be described as diffusion in a quasi-1D X-dependent free energy profile. However, a granular analysis using the Pfold analysis, which does not assume any form for the reaction coordinate, shows that X alone does not account for the height and, more importantly, the location of the TS. The f-dependent TS location moves toward the folded state as f increases, in accord with the Hammond postulate. Our study shows that, in addition to analyzing the f-dependent hopping rates, the transition state ensemble must also be determined without resorting to X as a reaction coordinate to describe the unfolding energy landscapes of single domain proteins, especially if they are only WMD.
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Affiliation(s)
- Balaka Mondal
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, Karnataka 560012, India
| | - D Thirumalai
- Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States
| | - Govardhan Reddy
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, Karnataka 560012, India
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10
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Baylis B, Shelton E, Grossutti M, Dutcher JR. Force Spectroscopy Mapping of the Effect of Hydration on the Stiffness and Deformability of Phytoglycogen Nanoparticles. Biomacromolecules 2021; 22:2985-2995. [PMID: 34085822 DOI: 10.1021/acs.biomac.1c00399] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phytoglycogen is a naturally occurring glucose polymer that is produced by sweet corn in the form of compact nanoparticles with a dendritic or tree-like architecture. The soft and porous nature of the nanoparticles, combined with their biodegradability and lack of toxicity, makes them ideal for a broad range of applications in personal care, nutrition, and biomedicine. To fully exploit these applications, it is necessary to understand the complex properties of the soft, hydrated nanoparticles in detail. In the present study, we have used atomic force microscopy (AFM) force spectroscopy to collect high-resolution force-distance maps of a large number of individual phytoglycogen nanoparticles, providing unique insights into the morphology and mechanical stiffness of the nanoparticles at the single-particle level. Our measurements performed in water on nanoparticles covalently bonded to gold surfaces revealed an inner branched structure and high deformability of the nanoparticles at modest values of the applied force. These measurements also allowed us to determine the spatial distribution of Young's modulus values within individual nanoparticles. Drying of the nanoparticles resulted in a dramatic increase in Young's modulus, quantifying the effect of hydration on their mechanical stiffness. We obtained excellent agreement between AFM and osmotic pressure measurements of the mechanical properties of hydrated phytoglycogen nanoparticles; the ratio of the average Young's modulus measured using AFM to the bulk modulus measured using osmotic pressure was in close agreement with that expected for a material with Poisson's ratio ν = 0. The soft, deformable nature of phytoglycogen nanoparticles revealed by our measurements provides new insights at the single-nanoparticle level and suggests their suitability for biomedical applications such as transdermal and targeted drug delivery.
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Affiliation(s)
- Benjamin Baylis
- Department of Physics, University of Guelph, Guelph N1G 2W1, Ontario, Canada
| | - Erin Shelton
- Department of Physics, University of Guelph, Guelph N1G 2W1, Ontario, Canada
| | - Michael Grossutti
- Department of Physics, University of Guelph, Guelph N1G 2W1, Ontario, Canada
| | - John R Dutcher
- Department of Physics, University of Guelph, Guelph N1G 2W1, Ontario, Canada
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11
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Rakshit T, Melters DP, Dimitriadis EK, Dalal Y. Mechanical properties of nucleoprotein complexes determined by nanoindentation spectroscopy. Nucleus 2021; 11:264-282. [PMID: 32954931 PMCID: PMC7529419 DOI: 10.1080/19491034.2020.1816053] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The interplay between transcription factors, chromatin remodelers, 3-D organization, and mechanical properties of the chromatin fiber controls genome function in eukaryotes. Besides the canonical histones which fold the bulk of the chromatin into nucleosomes, histone variants create distinctive chromatin domains that are thought to regulate transcription, replication, DNA damage repair, and faithful chromosome segregation. Whether histone variants translate distinctive biochemical or biophysical properties to their associated chromatin structures, and whether these properties impact chromatin dynamics as the genome undergoes a multitude of transactions, is an important question in biology. Here, we describe single-molecule nanoindentation tools that we developed specifically to determine the mechanical properties of histone variant nucleosomes and their complexes. These methods join an array of cutting-edge new methods that further our quantitative understanding of the response of chromatin to intrinsic and extrinsic forces which act upon it during biological transactions in the nucleus.
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Affiliation(s)
- Tatini Rakshit
- Laboratory of Receptor Biology and Gene Expression, Center for Cancer Research, National Cancer Institute, NIH , Bethesda, MD, USA.,Department of Chemical, Biological & Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences , Salt Lake, India
| | - Daniël P Melters
- Laboratory of Receptor Biology and Gene Expression, Center for Cancer Research, National Cancer Institute, NIH , Bethesda, MD, USA
| | - Emilios K Dimitriadis
- Trans-NIH Shared Resource on Biomedical Engineering and Physical Science, National Cancer Institute, NIH , Bethesda, MD, USA
| | - Yamini Dalal
- Laboratory of Receptor Biology and Gene Expression, Center for Cancer Research, National Cancer Institute, NIH , Bethesda, MD, USA
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12
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Kulkarni T, Mukhopadhyay D, Bhattacharya S. Nanomechanical Insight of Pancreatic Cancer Cell Membrane during Receptor Mediated Endocytosis of Targeted Gold Nanoparticles. ACS APPLIED BIO MATERIALS 2021; 4:984-994. [PMID: 34913031 DOI: 10.1021/acsabm.0c01443] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Nanoscale alterations in the cellular membrane transpire during cellular interactions with the extracellular environment through the endocytosis processes. Although the biological innuendos as well as alterations in cellular morphology during endocytosis are well-known, nanomechanical amendments in the cellular membrane are poorly understood. In this manuscript, atomic force microscope is employed to demonstrate the nanomechanical alterations in membrane dynamics during receptor mediated endocytosis of gold nanoparticles conjugated with either plectin-1 targeted peptide (PTP-GNP) or scrambled peptide (sPEP-GNP). Plectin-1 is aberrantly overexpressed at cell membrane of pancreatic cancer cells and is known to provide and maintain cellular mechanical integrity. During receptor mediated endocytosis of nanoparticles, we demonstrate temporal nanomechanical changes of cell membrane in both immortal pancreatic cancer Panc1 cells and patient derived primary pancreatic cancer cell, 4911. We further confirm the alterations of plectin-1 expression in Panc1 cell membrane during the receptor mediated endocytosis using classical streptavidin-biotin reaction and establish its association with nanomechanical alteration in membrane dynamics. Withdrawal of PTP-GNPs from the cell culture restores the plectin-1 expression at the membrane and reverses the mechanical properties of Panc1. We also show a distinctly opposite trend in nanomechanical behavior in cancer and endothelial cells when treated with sPEP-GNP and PTP-GNP, respectively, signifying receptor independent endocytosis process. This study illustrates the nanomechanical perspective of cell membrane in receptor mediated endocytosis of nanoparticles designed for organ specific drug delivery.
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Affiliation(s)
- Tanmay Kulkarni
- Department of Biochemistry and Molecular Biology, Mayo College of Medicine and Science, Jacksonville, Florida 32224, United States
| | - Debabrata Mukhopadhyay
- Department of Biochemistry and Molecular Biology and Department of Physiology and Biomedical Engineering, Mayo College of Medicine and Science, Jacksonville, Florida 32224, United States
| | - Santanu Bhattacharya
- Department of Biochemistry and Molecular Biology and Department of Physiology and Biomedical Engineering, Mayo College of Medicine and Science, Jacksonville, Florida 32224, United States
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13
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Kiss B, Mudra D, Török G, Mártonfalvi Z, Csík G, Herényi L, Kellermayer M. Single-particle virology. Biophys Rev 2020; 12:1141-1154. [PMID: 32880826 PMCID: PMC7471434 DOI: 10.1007/s12551-020-00747-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 08/18/2020] [Indexed: 01/02/2023] Open
Abstract
The development of advanced experimental methodologies, such as optical tweezers, scanning-probe and super-resolved optical microscopies, has led to the evolution of single-molecule biophysics, a field of science that allows direct access to the mechanistic detail of biomolecular structure and function. The extension of single-molecule methods to the investigation of particles such as viruses permits unprecedented insights into the behavior of supramolecular assemblies. Here we address the scope of viral exploration at the level of individual particles. In an era of increased awareness towards virology, single-particle approaches are expected to facilitate the in-depth understanding, and hence combating, of viral diseases.
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Affiliation(s)
- Bálint Kiss
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Dorottya Mudra
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - György Török
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Zsolt Mártonfalvi
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Gabriella Csík
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Levente Herényi
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - Miklós Kellermayer
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary.
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14
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Obeid S, Guyomarc'h F. Atomic force microscopy of food assembly: Structural and mechanical insights at the nanoscale and potential opportunities from other fields. FOOD BIOSCI 2020. [DOI: 10.1016/j.fbio.2020.100654] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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15
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Iqbal KM, Bertino MF, Shah MR, Ehrhardt CJ, Yadavalli VK. Nanoscale Phenotypic Textures of Yersinia pestis Across Environmentally-Relevant Matrices. Microorganisms 2020; 8:microorganisms8020160. [PMID: 31979277 PMCID: PMC7074701 DOI: 10.3390/microorganisms8020160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 01/20/2020] [Accepted: 01/21/2020] [Indexed: 11/16/2022] Open
Abstract
The persistence of bacterial pathogens within environmental matrices plays an important role in the epidemiology of diseases, as well as impacts biosurveillance strategies. However, the adaptation potentials, mechanisms for survival, and ecological interactions of pathogenic bacteria such as Yersinia pestis are largely uncharacterized owing to the difficulty of profiling their phenotypic signatures. In this report, we describe studies on Y. pestis organisms cultured within soil matrices, which are among the most important reservoirs for their propagation. Morphological (nanoscale) and phenotypic analysis are presented at the single cell level conducted using Atomic Force Microscopy (AFM), coupled with biochemical profiles of bulk populations using Fatty Acid Methyl Ester Profiling (FAME). These studies are facilitated by a novel, customizable, 3D printed diffusion chamber that allows for control of the external environment and easy harvesting of cells. The results show that incubation within soil matrices lead to reduction of cell size and an increase in surface hydrophobicity. FAME profiles indicate shifts in unsaturated fatty acid compositions, while other fatty acid components of the phospholipid membrane or surface lipids remained consistent across culturing conditions, suggesting that phenotypic shifts may be driven by non-lipid components of Y. pestis.
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Affiliation(s)
- Kanwal M. Iqbal
- H.E.J. Research Institute, University of Karachi, Pakistan 75270; (K.M.I.); (M.R.S.)
| | - Massimo F. Bertino
- Department of Physics, Virginia Commonwealth University, Richmond, VA 23284, USA;
| | - Muhammed R. Shah
- H.E.J. Research Institute, University of Karachi, Pakistan 75270; (K.M.I.); (M.R.S.)
| | | | - Vamsi K. Yadavalli
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA
- Correspondence: ; Tel.: +1-804-828-0587
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16
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Lee SC, Collins R, Lin YP, Jamshad M, Broughton C, Harris SA, Hanson BS, Tognoloni C, Parslow RA, Terry AE, Rodger A, Smith CJ, Edler KJ, Ford R, Roper DI, Dafforn TR. Nano-encapsulated Escherichia coli Divisome Anchor ZipA, and in Complex with FtsZ. Sci Rep 2019; 9:18712. [PMID: 31822696 PMCID: PMC6904479 DOI: 10.1038/s41598-019-54999-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Accepted: 11/10/2019] [Indexed: 12/21/2022] Open
Abstract
The E. coli membrane protein ZipA, binds to the tubulin homologue FtsZ, in the early stage of cell division. We isolated ZipA in a Styrene Maleic Acid lipid particle (SMALP) preserving its position and integrity with native E. coli membrane lipids. Direct binding of ZipA to FtsZ is demonstrated, including FtsZ fibre bundles decorated with ZipA. Using Cryo-Electron Microscopy, small-angle X-ray and neutron scattering, we determine the encapsulated-ZipA structure in isolation, and in complex with FtsZ to a resolution of 1.6 nm. Three regions can be identified from the structure which correspond to, SMALP encapsulated membrane and ZipA transmembrane helix, a separate short compact tether, and ZipA globular head which binds FtsZ. The complex extends 12 nm from the membrane in a compact structure, supported by mesoscale modelling techniques, measuring the movement and stiffness of the regions within ZipA provides molecular scale analysis and visualisation of the early divisome.
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Affiliation(s)
- Sarah C Lee
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
| | - Richard Collins
- Faculty of Life Sciences, A4032 Michael Smith Building, Oxford Road, Manchester, M13 9PT, UK
| | - Yu-Pin Lin
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Mohammed Jamshad
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Claire Broughton
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Sarah A Harris
- School of Physics and Astronomy and Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, UK
| | - Benjamin S Hanson
- School of Physics and Astronomy and Astbury Centre for Structural and Molecular Biology, University of Leeds, Leeds, UK
| | - Cecilia Tognoloni
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Rosemary A Parslow
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ann E Terry
- MAX IV Laboratory Lund University, P.O. Box 118, SE-221 00, Lund, Sweden
| | - Alison Rodger
- Department of Molecular Sciences, Macquarie University, Macquarie, NSW, 2109, Australia
| | - Corinne J Smith
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Karen J Edler
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Robert Ford
- Faculty of Life Sciences, A4032 Michael Smith Building, Oxford Road, Manchester, M13 9PT, UK
| | - David I Roper
- School of Life Sciences, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Timothy R Dafforn
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
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17
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Li G, Dobryden I, Salazar-Sandoval EJ, Johansson M, Claesson PM. Load-dependent surface nanomechanical properties of poly-HEMA hydrogels in aqueous medium. SOFT MATTER 2019; 15:7704-7714. [PMID: 31508653 DOI: 10.1039/c9sm01113g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The mechanical properties of hydrogels are of importance in many applications, including scaffolds and drug delivery vehicles where the release of drugs is controlled by water transport. While the macroscopic mechanical properties of hydrogels have been reported frequently, there are less studies devoted to the equally important nanomechanical response to local load and shear. Scanning probe methods offer the possibility to gain insight on surface nanomechanical properties with high spatial resolution, and thereby provide fundamental insights on local material property variations. In this work, we investigate the local response to load and shear of poly(2-hydroxyethyl methacrylate) hydrogels with two different cross-linking densities submerged in aqueous solution. The response of the hydrogels to purely normal loads, as well as the combined action of load and shear, was found to be complex due to viscoelastic effects. Our results show that the surface stiffness of the hydrogel samples increased with increasing load, while the tip-hydrogel adhesion was strongly affected by the load only when the cross-linking density was low. The combined action of load and shear results in the formation of a temporary sub-micrometer hill in front of the laterally moving tip. As the tip pushes against such hills, a pronounced stick-slip effect is observed for the hydrogel with low cross-linking density. No plastic deformation or permanent wear scar was found under our experimental conditions.
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Affiliation(s)
- Gen Li
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas väg 51, SE 10044 Stockholm, Sweden.
| | - Illia Dobryden
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas väg 51, SE 10044 Stockholm, Sweden.
| | | | - Mats Johansson
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Fibre & Polymer Technology, Teknikringen 48, SE 10044 Stockholm, Sweden
| | - Per M Claesson
- KTH Royal Institute of Technology, School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science, Drottning Kristinas väg 51, SE 10044 Stockholm, Sweden. and RISE Research Institutes of Sweden, Division of Bioscience and Materials, Box 5607, SE 114 86 Stockholm, Sweden
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18
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Tomeh MA, Hadianamrei R, Zhao X. Silk Fibroin as a Functional Biomaterial for Drug and Gene Delivery. Pharmaceutics 2019; 11:E494. [PMID: 31561578 PMCID: PMC6835371 DOI: 10.3390/pharmaceutics11100494] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2019] [Revised: 09/24/2019] [Accepted: 09/24/2019] [Indexed: 01/31/2023] Open
Abstract
Silk is a natural polymer with unique physicochemical and mechanical properties which makes it a desirable biomaterial for biomedical and pharmaceutical applications. Silk fibroin (SF) has been widely used for preparation of drug delivery systems due to its biocompatibility, controllable degradability and tunable drug release properties. SF-based drug delivery systems can encapsulate and stabilize various small molecule drugs as well as large biological drugs such as proteins and DNA to enhance their shelf lives and control the release to enhance their circulation time in the blood and thus the duration of action. Understanding the properties of SF and the potential ways of manipulating its structure to modify its physicochemical and mechanical properties allows for preparation of modulated drug delivery systems with desirable efficacies. This review will discuss the properties of SF material and summarize the recent advances of SF-based drug and gene delivery systems. Furthermore, conjugation of the SF to other biomolecules or polymers for tissue-specific drug delivery will also be discussed.
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Affiliation(s)
- Mhd Anas Tomeh
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK.
| | - Roja Hadianamrei
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK.
| | - Xiubo Zhao
- Department of Chemical and Biological Engineering, University of Sheffield, Sheffield S1 3JD, UK.
- School of Pharmaceutical Engineering and Life Science, Changzhou University, Changzhou 213164, China.
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19
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Cárdenas-Pérez S, Chanona-Pérez JJ, Méndez-Méndez JV, Arzate-Vázquez I, Hernández-Varela JD, Vera NG. Recent advances in atomic force microscopy for assessing the nanomechanical properties of food materials. Trends Food Sci Technol 2019. [DOI: 10.1016/j.tifs.2018.04.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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20
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Cheng J, Geng F, Hu J, Lü J. Single-molecule measurement and bioinformatics analysis suggest a preferred orientation of human coagulation factor VIII on hydrophobic interfaces. Biophys Chem 2019; 248:9-15. [PMID: 30901531 DOI: 10.1016/j.bpc.2019.03.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 03/04/2019] [Accepted: 03/13/2019] [Indexed: 11/28/2022]
Abstract
Investigating the adsorption behavior of coagulation proteins on interfaces will contribute to better understating blood clotting and to the development of biocompatible materials. In this work, atomic force microscopy (AFM)-based peakforce quantitative nanomechanical mapping (PF-QNM) was combined with bioinformatics tool to study the adsorption and orientation of coagulation factor VIII (FVIII) on both hydrophilic and hydrophobic interfaces by the height and mechanical measurement of single protein molecules. We found that interfacial hydrophilicity/hydrophobicity greatly influence the heights and Young's modulus of individual proteins. Compared to on the hydrophilic mica surface, FVIII proteins appear bigger vertical sizes while similar lateral sizes on the HOPG surface. The water accessible surface area analysis indicate stronger apolar properties C1 and C2 domains than others, suggesting a preferred orientation through the strong hydrophobic interactions between HOPG and the hydrophobic residues interface of the protein domains. These results provide novel insights on the adsorption and binding mechanism of the FVIII on cell membrane and will be helpful for the design of anticoagulant materials.
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Affiliation(s)
- Jie Cheng
- Zhangjiang Lab, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China; CAS Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Feng Geng
- School of Pharmacy, Binzhou Medicine University, Yantai 300064, China
| | - Jun Hu
- Zhangjiang Lab, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China; CAS Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Junhong Lü
- Zhangjiang Lab, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China; CAS Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.
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21
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Stylianou A, Kontomaris SV, Grant C, Alexandratou E. Atomic Force Microscopy on Biological Materials Related to Pathological Conditions. SCANNING 2019; 2019:8452851. [PMID: 31214274 PMCID: PMC6535871 DOI: 10.1155/2019/8452851] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 02/23/2019] [Accepted: 03/07/2019] [Indexed: 05/16/2023]
Abstract
Atomic force microscopy (AFM) is an easy-to-use, powerful, high-resolution microscope that allows the user to image any surface and under any aqueous condition. AFM has been used in the investigation of the structural and mechanical properties of a wide range of biological matters including biomolecules, biomaterials, cells, and tissues. It provides the capacity to acquire high-resolution images of biosamples at the nanoscale and allows at readily carrying out mechanical characterization. The capacity of AFM to image and interact with surfaces, under physiologically relevant conditions, is of great importance for realistic and accurate medical and pharmaceutical applications. The aim of this paper is to review recent trends of the use of AFM on biological materials related to health and sickness. First, we present AFM components and its different imaging modes and we continue with combined imaging and coupled AFM systems. Then, we discuss the use of AFM to nanocharacterize collagen, the major fibrous protein of the human body, which has been correlated with many pathological conditions. In the next section, AFM nanolevel surface characterization as a tool to detect possible pathological conditions such as osteoarthritis and cancer is presented. Finally, we demonstrate the use of AFM for studying other pathological conditions, such as Alzheimer's disease and human immunodeficiency virus (HIV), through the investigation of amyloid fibrils and viruses, respectively. Consequently, AFM stands out as the ideal research instrument for exploring the detection of pathological conditions even at very early stages, making it very attractive in the area of bio- and nanomedicine.
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Affiliation(s)
- Andreas Stylianou
- Cancer Biophysics Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia 2238, Cyprus
| | - Stylianos-Vasileios Kontomaris
- Mobile Radio Communications Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytechniou, Athens 15780, Greece
- Athens Metropolitan College, Sorou 74, Marousi 15125, Greece
| | - Colin Grant
- Hitachi High-Technologies Europe, Techspace One, Keckwick Lane, Warrington WA4 4AB, UK
| | - Eleni Alexandratou
- Biomedical Optics and Applied Biophysics Laboratory, School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytechniou, Athens 15780, Greece
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22
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Qian L, Zhao H. Nanoindentation of Soft Biological Materials. MICROMACHINES 2018; 9:E654. [PMID: 30544918 PMCID: PMC6316095 DOI: 10.3390/mi9120654] [Citation(s) in RCA: 58] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 11/27/2018] [Accepted: 12/05/2018] [Indexed: 01/01/2023]
Abstract
Nanoindentation techniques, with high spatial resolution and force sensitivity, have recently been moved into the center of the spotlight for measuring the mechanical properties of biomaterials, especially bridging the scales from the molecular via the cellular and tissue all the way to the organ level, whereas characterizing soft biomaterials, especially down to biomolecules, is fraught with more pitfalls compared with the hard biomaterials. In this review we detail the constitutive behavior of soft biomaterials under nanoindentation (including AFM) and present the characteristics of experimental aspects in detail, such as the adaption of instrumentation and indentation response of soft biomaterials. We further show some applications, and discuss the challenges and perspectives related to nanoindentation of soft biomaterials, a technique that can pinpoint the mechanical properties of soft biomaterials for the scale-span is far-reaching for understanding biomechanics and mechanobiology.
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Affiliation(s)
- Long Qian
- School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China.
| | - Hongwei Zhao
- School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China.
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23
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Temperature-Dependent Nanomechanics and Topography of Bacteriophage T7. J Virol 2018; 92:JVI.01236-18. [PMID: 30089696 DOI: 10.1128/jvi.01236-18] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 07/30/2018] [Indexed: 01/10/2023] Open
Abstract
Viruses are nanoscale infectious agents which may be inactivated by heat treatment. The global molecular mechanisms of virus inactivation and the thermally induced structural changes in viruses are not fully understood. In this study, we measured the heat-induced changes in the properties of T7 bacteriophage particles exposed to a two-stage (65°C and 80°C) thermal effect, by using atomic force microscopy (AFM)-based nanomechanical and topographical measurements. We found that exposure to 65°C led to the release of genomic DNA and to the loss of the capsid tail; hence, the T7 particles became destabilized. Further heating to 80°C surprisingly led to an increase in mechanical stability, due likely to partial denaturation of the capsomeric proteins kept within the global capsid arrangement.IMPORTANCE Even though the loss of DNA, caused by heat treatment, destabilizes the T7 phage, its capsid is remarkably able to withstand high temperatures with a more or less intact global topographical structure. Thus, partial denaturation within the global structural constraints of the viral capsid may have a stabilizing effect. Understanding the structural design of viruses may help in constructing artificial nanocapsules for the packaging and delivery of materials under harsh environmental conditions.
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24
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Straka F, Schornik D, Masin J, Filova E, Mirejovsky T, Burdikova Z, Svindrych Z, Chlup H, Horny L, Daniel M, Machac J, Skibová J, Pirk J, Bacakova L. A human pericardium biopolymeric scaffold for autologous heart valve tissue engineering: cellular and extracellular matrix structure and biomechanical properties in comparison with a normal aortic heart valve. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2018; 29:599-634. [PMID: 29338582 DOI: 10.1080/09205063.2018.1429732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The objective of our study was to compare the cellular and extracellular matrix (ECM) structure and the biomechanical properties of human pericardium (HP) with the normal human aortic heart valve (NAV). HP tissues (from 12 patients) and NAV samples (from 5 patients) were harvested during heart surgery. The main cells in HP were pericardial interstitial cells, which are fibroblast-like cells of mesenchymal origin similar to the valvular interstitial cells in NAV tissue. The ECM of HP had a statistically significantly (p < 0.001) higher collagen I content, a lower collagen III and elastin content, and a similar glycosaminoglycans (GAGs) content, in comparison with the NAV, as measured by ECM integrated density. However, the relative thickness of the main load-bearing structures of the two tissues, the dense part of fibrous HP (49 ± 2%) and the lamina fibrosa of NAV (47 ± 4%), was similar. In both tissues, the secant elastic modulus (Es) was significantly lower in the transversal direction (p < 0.05) than in the longitudinal direction. This proved that both tissues were anisotropic. No statistically significant differences in UTS (ultimate tensile strength) values and in calculated bending stiffness values in the longitudinal or transversal direction were found between HP and NAV. Our study confirms that HP has an advantageous ECM biopolymeric structure and has the biomechanical properties required for a tissue from which an autologous heart valve replacement may be constructed.
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Affiliation(s)
- Frantisek Straka
- a Cardiology Centre and Cardiovascular Surgery Department , Institute for Clinical and Experimental Medicine , Prague , Czech Republic.,b Department of Biomaterials and Tissue Engineering , Institute of Physiology, Academy of Sciences of the Czech Republic , Prague , Czech Republic
| | - David Schornik
- b Department of Biomaterials and Tissue Engineering , Institute of Physiology, Academy of Sciences of the Czech Republic , Prague , Czech Republic
| | - Jaroslav Masin
- a Cardiology Centre and Cardiovascular Surgery Department , Institute for Clinical and Experimental Medicine , Prague , Czech Republic
| | - Elena Filova
- b Department of Biomaterials and Tissue Engineering , Institute of Physiology, Academy of Sciences of the Czech Republic , Prague , Czech Republic
| | - Tomas Mirejovsky
- c Clinical and Transplant Pathology Department, Institute for Clinical and Experimental Medicine , Prague , Czech Republic
| | - Zuzana Burdikova
- d Department of Cell Biology, School of Medicine , University of Virginia , Charlottesville , VA , USA
| | - Zdenek Svindrych
- e Department of Biology, W. M, Keck Center for Cellular Imaging , University of Virginia , Charlottesville , VA , USA
| | - Hynek Chlup
- f Faculty of Mechanical Engineering, Department of Mechanics, Biomechanics and Mechatronics , Czech Technical University in Prague , Prague , Czech Republic
| | - Lukas Horny
- f Faculty of Mechanical Engineering, Department of Mechanics, Biomechanics and Mechatronics , Czech Technical University in Prague , Prague , Czech Republic
| | - Matej Daniel
- f Faculty of Mechanical Engineering, Department of Mechanics, Biomechanics and Mechatronics , Czech Technical University in Prague , Prague , Czech Republic
| | - Jiri Machac
- g Institute of Botany CAS, Academy of Sciences of the Czech Republic , Pruhonice , Czech Republic
| | - Jelena Skibová
- h Department of Medical Statistics , Institute for Clinical and Experimental Medicine , Prague , Czech Republic
| | - Jan Pirk
- a Cardiology Centre and Cardiovascular Surgery Department , Institute for Clinical and Experimental Medicine , Prague , Czech Republic
| | - Lucie Bacakova
- b Department of Biomaterials and Tissue Engineering , Institute of Physiology, Academy of Sciences of the Czech Republic , Prague , Czech Republic
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25
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Gazze SA, Hallin I, Quinn G, Dudley E, Matthews GP, Rees P, van Keulen G, Doerr SH, Francis LW. Organic matter identifies the nano-mechanical properties of native soil aggregates. NANOSCALE 2018; 10:520-525. [PMID: 29239448 DOI: 10.1039/c7nr07070e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Localized variations at the nanoscale in soil aggregates and in the spatial organisation of soil organic matter (SOM) are critical to understanding the factors involved in soil composition and turnover. However soil nanoscience has been hampered by the lack of suitable methods to determine soil biophysical properties at nanometre spatial resolution with minimal sample preparation. Here we introduce for the first time an Atomic Force Microscopy (AFM)-based Quantitative Nano-Mechanical mapping (QNM) approach that allows the characterisation of the role of SOM in controlling surface nano-mechanical properties of soil aggregates. SOM coverage resulted in an increased roughness and surface variability of soil, as well as in decreased stiffness and adhesive properties. The latter also correlates with nano- to macro-wettability features as determined by contact angle measurements and Water Drop Penetration Time (WDPT) testing. AFM thus represents an ideal quantitative tool to complement existing techniques within the emerging field of soil nanoscience.
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Affiliation(s)
- S A Gazze
- Swansea University Medical School, Swansea SA2 8PP, UK.
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26
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AFM contribution to unveil pro- and eukaryotic cell mechanical properties. Semin Cell Dev Biol 2018; 73:177-187. [DOI: 10.1016/j.semcdb.2017.08.032] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 07/28/2017] [Accepted: 08/14/2017] [Indexed: 02/06/2023]
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Zhou T, Hua Y, Zhang B, Zhang X, Zhou Y, Shi L, Xu F. Low-Boron Tolerance Strategies Involving Pectin-Mediated Cell Wall Mechanical Properties in Brassica napus. PLANT & CELL PHYSIOLOGY 2017; 58:1991-2005. [PMID: 29016959 DOI: 10.1093/pcp/pcx130] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Accepted: 08/22/2017] [Indexed: 05/18/2023]
Abstract
Boron (B) is an essential micronutrient for the growth and development of plants. Oilseed rape (Brassica napus L.) is a staple oleaginous crop, which is greatly susceptible to B deficiency. Significant differences in tolerance of low-B stresses are observed in rapeseed genotypes, but the underlying mechanism remains unclear, particularly at the single-cell level. Here we provide novel insights into pectin-mediated cell wall (CW) mechanical properties implicated in the differential tolerance of low B in rapeseed genotypes. Under B deficiency, suspension cells of the low-B-sensitive genotype 'W10' showed more severely deformed morphology, lower viabilities and a more easily ruptured CW than those of the low-B-tolerant genotype 'QY10'. Cell rupture was attributed to the weakened CW mechanical strength detected by atomic force microscopy; the CW mechanical strength of 'QY10' was reduced by 13.6 and 17.4%, whereas that of 'W10' was reduced by 29.0 and 30.4% under 0.25 and 0.10 μM B conditions, respectively. The mechanical strength differences between 'QY10' and 'W10' were diminished after the removal of pectin. Further, 'W10' exhibited significantly higher pectin concentrations with much more rhamnogalacturonan II (RG-II) monomer, and also presented obviously higher mRNA abundances of pectin biosynthesis-related genes than 'QY10' under B deficiency. CW regeneration was more difficult for protoplasts of 'W10' than for those of 'QY10'. Taking the results together, we conclude that the variations in pectin-endowed CW mechanical properties play key roles in modulating the differential genotypic tolerance of rapeseed to low-B stresses at both the single-cell and the plant level, and this can potentially be used as a selection trait for low-B-tolerant rapeseed breeding.
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Affiliation(s)
- Ting Zhou
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
- Microelement Research Centre, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yingpeng Hua
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
- Microelement Research Centre, Huazhong Agricultural University, Wuhan, 430070, China
| | - Baocai Zhang
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Xiuqing Zhang
- Microelement Research Centre, Huazhong Agricultural University, Wuhan, 430070, China
| | - Yihua Zhou
- State Key Laboratory of Plant Genomics, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Lei Shi
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
- Microelement Research Centre, Huazhong Agricultural University, Wuhan, 430070, China
| | - Fangsen Xu
- National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China
- Microelement Research Centre, Huazhong Agricultural University, Wuhan, 430070, China
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Effect of crosslinking on the physical and chemical properties of β-lactoglobulin (Blg) microgels. J Colloid Interface Sci 2017; 505:736-744. [PMID: 28662476 DOI: 10.1016/j.jcis.2017.06.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 06/18/2017] [Indexed: 12/21/2022]
Abstract
HYPOTHESIS Microgels assembled from the protein β-lactoglobulin are colloidal structures with potential applications in food materials. Modifying the internal crosslinking within these microgels using enzymatic or chemical treatments should affect dissolution, swelling, and viscous attributes under strongly solvating conditions. EXPERIMENTS Microgels were treated with citric acid, glutaraldehyde and transglutaminase to induce cross-linking or with tris(2-carboxyethyl)phosphine to reduce disulfide linkages. Change in hydrodynamic particle size due to acidic pH, alkaline pH, ionic strength, osmolyte concentration, ethanol, urea, sodium dodecyl sulfate, and reducing agents was evaluated by light scattering measurements. Changes in microgel nanomechanical properties were evaluated via force spectroscopic measurements in water. FINDINGS Average microgel size increased ∼20% in alkaline pH and with ethanol contents above 10%, and decreased ∼20% with sucrose contents above 10%. Cross-linking by glutaraldehyde and transglutaminase prevented size increases in alkaline pH. Microgel plasticity and elastic modulus were unaffected by treatments. Microgels treated with glutaraldehyde were found to have much greater stability to urea, sodium dodecyl sulfate, and reducing agents when compared to other samples. Even without cross-linking, microgels remained stable against precipitation and dissolution over a wide range conditions, indicating their broad utility as colloidal stabilizers, texture modifiers or controlled release agents in food or other applications.
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29
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Strange AP, Aguayo S, Ahmed T, Mordan N, Stratton R, Porter SR, Parekh S, Bozec L. Quantitative nanohistological investigation of scleroderma: an atomic force microscopy-based approach to disease characterization. Int J Nanomedicine 2017; 12:411-420. [PMID: 28138238 PMCID: PMC5238774 DOI: 10.2147/ijn.s118690] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Scleroderma (or systemic sclerosis, SSc) is a disease caused by excess crosslinking of collagen. The skin stiffens and becomes painful, while internally, organ function can be compromised by the less elastic collagen. Diagnosis of SSc is often only possible in advanced cases by which treatment time is limited. A more detailed analysis of SSc may provide better future treatment options and information of disease progression. Recently, the histological stain picrosirius red showing collagen register has been combined with atomic force microscopy (AFM) to study SSc. Skin from healthy individuals and SSc patients was biopsied, stained and studied using AFM. By investigating the crosslinking of collagen at a smaller hierarchical stage, the effects of SSc were more pronounced. Changes in morphology and Young’s elastic modulus were observed and quantified; giving rise to a novel technique, we have termed “quantitative nanohistology”. An increase in nanoscale stiffness in the collagen for SSc compared with healthy individuals was seen by a significant increase in the Young’s modulus profile for the collagen. These markers of stiffer collagen in SSc are similar to the symptoms experienced by patients, giving additional hope that in the future, nanohistology using AFM can be readily applied as a clinical tool, providing detailed information of the state of collagen.
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Affiliation(s)
- Adam P Strange
- Department of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute
| | - Sebastian Aguayo
- Department of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute
| | - Tarek Ahmed
- Department of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute
| | - Nicola Mordan
- Department of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute
| | - Richard Stratton
- Centre for Rheumatology and Connective Tissue Diseases, Royal Free Hospital, UCL Medical School
| | | | - Susan Parekh
- Department of Pediatrics, UCL Eastman Dental Institute, London, UK
| | - Laurent Bozec
- Department of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute
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Guan ZY, Huang CW, Huang MC, Wu CY, Liu HY, Ding ST, Chen HY. Controlling multi-function of biomaterials interfaces based on multiple and competing adsorption of functional proteins. Colloids Surf B Biointerfaces 2017; 149:130-137. [PMID: 27750087 DOI: 10.1016/j.colsurfb.2016.10.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 09/30/2016] [Accepted: 10/01/2016] [Indexed: 10/20/2022]
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31
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Kontomaris SV, Stylianou A, Yova D. Investigation of the mechanical properties of collagen fibrils under the influence of low power red laser irradiation. Biomed Phys Eng Express 2016. [DOI: 10.1088/2057-1976/aa5195] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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32
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Ekiz MS, Cinar G, Khalily MA, Guler MO. Self-assembled peptide nanostructures for functional materials. NANOTECHNOLOGY 2016; 27:402002. [PMID: 27578525 DOI: 10.1088/0957-4484/27/40/402002] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Nature is an important inspirational source for scientists, and presents complex and elegant examples of adaptive and intelligent systems created by self-assembly. Significant effort has been devoted to understanding these sophisticated systems. The self-assembly process enables us to create supramolecular nanostructures with high order and complexity, and peptide-based self-assembling building blocks can serve as suitable platforms to construct nanostructures showing diverse features and applications. In this review, peptide-based supramolecular assemblies will be discussed in terms of their synthesis, design, characterization and application. Peptide nanostructures are categorized based on their chemical and physical properties and will be examined by rationalizing the influence of peptide design on the resulting morphology and the methods employed to characterize these high order complex systems. Moreover, the application of self-assembled peptide nanomaterials as functional materials in information technologies and environmental sciences will be reviewed by providing examples from recently published high-impact studies.
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Affiliation(s)
- Melis Sardan Ekiz
- Institute of Materials Science and Nanotechnology, National Nanotechnology Research Center (UNAM), Bilkent University, Ankara, 06800 Turkey
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33
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Moshtagh PR, Pouran B, Korthagen NM, Zadpoor AA, Weinans H. Guidelines for an optimized indentation protocol for measurement of cartilage stiffness: The effects of spatial variation and indentation parameters. J Biomech 2016; 49:3602-3607. [DOI: 10.1016/j.jbiomech.2016.09.020] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 09/13/2016] [Accepted: 09/14/2016] [Indexed: 11/30/2022]
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34
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Marchetti M, Wuite GJL, Roos WH. Atomic force microscopy observation and characterization of single virions and virus-like particles by nano-indentation. Curr Opin Virol 2016; 18:82-8. [DOI: 10.1016/j.coviro.2016.05.002] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2015] [Revised: 05/10/2016] [Accepted: 05/12/2016] [Indexed: 11/15/2022]
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35
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Whang M, Kim J. Synthetic hydrogels with stiffness gradients for durotaxis study and tissue engineering scaffolds. Tissue Eng Regen Med 2016; 13:126-139. [PMID: 30603392 PMCID: PMC6170857 DOI: 10.1007/s13770-016-0026-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2016] [Revised: 03/02/2016] [Accepted: 03/03/2016] [Indexed: 12/21/2022] Open
Abstract
Migration of cells along the right direction is of paramount importance in a number of in vivo circumstances such as immune response, embryonic developments, morphogenesis, and healing of wounds and scars. While it has been known for a while that spatial gradients in chemical cues guide the direction of cell migration, the significance of the gradient in mechanical cues, such as stiffness of extracellular matrices (ECMs), in directed migration of cells has only recently emerged. With advances in synthetic chemistry, micro-fabrication techniques, and methods to characterize mechanical properties at a length scale even smaller than a single cell, synthetic ECMs with spatially controlled stiffness have been created with variations in design parameters. Since then, the synthetic ECMs have served as platforms to study the migratory behaviors of cells in the presence of the stiffness gradient of ECM and also as scaffolds for the regeneration of tissues. In this review, we highlight recent studies in cell migration directed by the stiffness gradient, called durotaxis, and discuss the mechanisms of durotaxis. We also summarize general methods and design principles to create synthetic ECMs with the stiffness gradients and, finally, conclude by discussing current limitations and future directions of synthetic ECMs for the study of durotaxis and the scaffold for tissue engineering.
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Affiliation(s)
- Minji Whang
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Korea
| | - Jungwook Kim
- Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, Korea
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36
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Effect of stabilizer type on the physicochemical properties of poly(acrylic acid)/silver nanocomposites for biomedical applications. Polym Bull (Berl) 2016. [DOI: 10.1007/s00289-016-1617-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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37
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Zdunek A, Kozioł A, Cybulska J, Lekka M, Pieczywek PM. The stiffening of the cell walls observed during physiological softening of pears. PLANTA 2016; 243:519-29. [PMID: 26498014 PMCID: PMC4722064 DOI: 10.1007/s00425-015-2423-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 10/13/2015] [Indexed: 05/12/2023]
Abstract
The Young's modulus of the primary cell walls of pears decreases linearly during the pre-harvest on-tree maturation and increases during postharvest storage, and does not correlate with firmness of fruit. The determination of mechanical properties of cell walls is indispensable for understanding the mechanism of physiological softening and deterioration of quality of fruits during postharvest storage. The Young's modulus of the primary cell walls from pear fruit (Pyrus communis L., cultivars 'Conference' and 'Xenia') during pre-harvest maturation and postharvest storage in an ambient atmosphere at 2 °C followed by shelf life was studied using atomic force microscopy (AFM). The results were related to the firmness of fruits, galacturonic acid content in water, chelator, sodium carbonate and insoluble pectin fractions, polygalacturonase and pectin methylesterase activities. The Young's modulus of the primary cell walls decreased linearly during the last month of pre-harvest maturation from 3.2 ± 1.8 to 1.1 ± 0.7 MPa for 'Conference' and from 1.9 ± 1.2 to 0.2 ± 0.1 MPa for 'Xenia' which correlated with linear firmness decrease. During postharvest storage the cell wall Young's modulus increased while firmness continued to decrease. Correlation analysis for the entire period of the experiment showed a lack of straightforward relation between the Young's modulus of primary cell walls and fruit firmness. The Young's modulus of cell walls correlated negatively either with galacturonic acid content in sodium carbonate soluble pectin ('Conference') or with insoluble pectin fractions ('Xenia') and positively with polygalacturonase activity. It was therefore evidenced that covalently linked pectins play the key role for the stiffness of fruit cell walls. Based on the obtained results, the model explaining the fruit transition from firm and crispy to soft and mealy was proposed.
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Affiliation(s)
- Artur Zdunek
- />Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
| | - Arkadiusz Kozioł
- />Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
| | - Justyna Cybulska
- />Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
| | - Małgorzata Lekka
- />The Henryk Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland
| | - Piotr M. Pieczywek
- />Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
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38
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Wang H, Black CT, Akcora P. Elastic Properties of Protein Functionalized Nanoporous Polymer Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:151-158. [PMID: 26672623 DOI: 10.1021/acs.langmuir.5b04334] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Retaining the conformational structure and bioactivity of immobilized proteins is important for biosensor designs and drug delivery systems. Confined environments often lead to changes in conformation and functions of proteins. In this study, lysozyme is chemically tethered into nanopores of polystyrene thin films, and submicron pores in poly(methyl methacrylate) films are functionalized with streptavidin. Nanoindentation experiments show that stiffness of streptavidin increases with decreasing submicron pore sizes. Lysozymes in polystyrene nanopores are found to behave stiffer than the submicron pore sizes and still retain their specific bioactivity relative to the proteins on flat surfaces. Our results show that protein functionalized ordered nanoporous polystyrene/poly(methyl methacrylate) films present heterogeneous elasticity and can be used to study interactions between free proteins and designed surfaces.
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Affiliation(s)
- Haoyu Wang
- Department of Chemical Engineering and Materials Science, Stevens Institute of Technology , 1 Castle Point on Hudson, Hoboken, New Jersey 07030, United States
| | - Charles T Black
- Center for Functional Nanomaterials, Brookhaven National Laboratory , Upton, New York 11973, United States
| | - Pinar Akcora
- Department of Chemical Engineering and Materials Science, Stevens Institute of Technology , 1 Castle Point on Hudson, Hoboken, New Jersey 07030, United States
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39
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Stylianou A, Stylianopoulos T. Atomic Force Microscopy Probing of Cancer Cells and Tumor Microenvironment Components. BIONANOSCIENCE 2015. [DOI: 10.1007/s12668-015-0187-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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40
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Chichti E, George M, Delenne JY, Lullien-Pellerin V. Changes in the starch-protein interface depending on common wheat grain hardness revealed using atomic force microscopy. PLANT SCIENCE : AN INTERNATIONAL JOURNAL OF EXPERIMENTAL PLANT BIOLOGY 2015; 239:1-8. [PMID: 26398785 DOI: 10.1016/j.plantsci.2015.07.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 07/06/2015] [Accepted: 07/07/2015] [Indexed: 06/05/2023]
Abstract
The atomic force microscope tip was used to progressively abrade the surface of non-cut starch granules embedded in the endosperm protein matrix in grain sections from wheat near-isogenic lines differing in the puroindoline b gene and thus, hardness. In the hard near-isogenic wheat lines, starch granules exhibited two distinct profiles corresponding either to abrasion in the surrounding protein layer or the starch granule. An additional profile, only identified in soft lines, revealed a marked stop in the abrasion at the protein-starch transition similar to a lipid interface playing a lubricant role. It was related to the presence of both wild-type puroindolines, already suggested to act at the starch-protein interface through their association with polar lipids. This study revealed, for the first time, in situ differences in the nano-mechanical properties at the starch-protein interface in the endosperm of wheat grains depending on the puroindoline allelic status.
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Affiliation(s)
- Emna Chichti
- INRA, UMR 1208, Ingénierie des Agropolymères et Technologies Emergentes, 2 Place Viala, 34060 Montpellier Cedex 02, France.
| | - Matthieu George
- Institut Charles Coulomb, UMR 5221, CNRS-UM2, Place Eugène Bataillon, 34095 Montpellier Cedex, France.
| | - Jean-Yves Delenne
- INRA, UMR 1208, Ingénierie des Agropolymères et Technologies Emergentes, 2 Place Viala, 34060 Montpellier Cedex 02, France.
| | - Valérie Lullien-Pellerin
- INRA, UMR 1208, Ingénierie des Agropolymères et Technologies Emergentes, 2 Place Viala, 34060 Montpellier Cedex 02, France.
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41
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He C, Ma J, Wang L. A hemicellulose-bound form of silicon with potential to improve the mechanical properties and regeneration of the cell wall of rice. THE NEW PHYTOLOGIST 2015; 206:1051-1062. [PMID: 25615017 DOI: 10.1111/nph.13282] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Accepted: 12/12/2014] [Indexed: 05/02/2023]
Abstract
Silicon (Si) plays a large number of diverse roles in plants, but the structural and chemical mechanisms operating at the single-cell level remain unclear. We isolate the cell walls from suspension-cultured individual cells of rice (Oryza sativa) and fractionate them into three main fractions including cellulose (C), hemicellulose (HC) and pectin (P). We find that most of the Si is in HC as determined by inductively coupled plasma-mass spectrometry (ICP-MS), where Si may covalently crosslink the HC polysacchrides confirmed by X-ray photoelectron spectroscopy (XPS). The HC-bound form of Si could improve both the mechanical property and regeneration of the cell walls investigated by a combination of atomic force microscopy (AFM) and confocal laser scanning microscopy (CLSM). This study provides further evidence that HC could be the major ligand bound to Si, which broadens our understanding of the chemical nature of 'anomalous' Si in plant cell walls.
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Affiliation(s)
- Congwu He
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Jie Ma
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
| | - Lijun Wang
- College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China
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42
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Bhat SV, Booth SC, McGrath SGK, Dahms TES. Rhizobium leguminosarum bv. viciae 3841 Adapts to 2,4-Dichlorophenoxyacetic Acid with "Auxin-Like" Morphological Changes, Cell Envelope Remodeling and Upregulation of Central Metabolic Pathways. PLoS One 2015; 10:e0123813. [PMID: 25919284 PMCID: PMC4412571 DOI: 10.1371/journal.pone.0123813] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Accepted: 03/07/2015] [Indexed: 11/18/2022] Open
Abstract
There is a growing need to characterize the effects of environmental stressors at the molecular level on model organisms with the ever increasing number and variety of anthropogenic chemical pollutants. The herbicide 2,4-dichlorophenoxyacetic acid (2,4-D), as one of the most widely applied pesticides in the world, is one such example. This herbicide is known to have non-targeted undesirable effects on humans, animals and soil microbes, but specific molecular targets at sublethal levels are unknown. In this study, we have used Rhizobium leguminosarum bv. viciae 3841 (Rlv) as a nitrogen fixing, beneficial model soil organism to characterize the effects of 2,4-D. Using metabolomics and advanced microscopy we determined specific target pathways in the Rlv metabolic network and consequent changes to its phenotype, surface ultrastructure, and physical properties during sublethal 2,4-D exposure. Auxin and 2,4-D, its structural analogue, showed common morphological changes in vitro which were similar to bacteroids isolated from plant nodules, implying that these changes are related to bacteroid differentiation required for nitrogen fixation. Rlv showed remarkable adaptation capabilities in response to the herbicide, with changes to integral pathways of cellular metabolism and the potential to assimilate 2,4-D with consequent changes to its physical and structural properties. This study identifies biomarkers of 2,4-D in Rlv and offers valuable insights into the mode-of-action of 2,4-D in soil bacteria.
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Affiliation(s)
- Supriya V. Bhat
- Department of Chemistry and Biochemistry, University of Regina, 3737 Wascana Parkway, Regina, SK, S4S 0A2 Canada
| | - Sean C. Booth
- Department of Biological Sciences, University of Calgary, 2500 University Dr, NW Calgary, AB, T2N 1N4 Canada
| | - Seamus G. K. McGrath
- Department of Chemistry and Biochemistry, University of Regina, 3737 Wascana Parkway, Regina, SK, S4S 0A2 Canada
| | - Tanya E. S. Dahms
- Department of Chemistry and Biochemistry, University of Regina, 3737 Wascana Parkway, Regina, SK, S4S 0A2 Canada
- * E-mail:
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43
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Gan C, Ao M, Liu Z, Chen Y. Imaging and force measurement of LDL and HDL by AFM in air and liquid. FEBS Open Bio 2015; 5:276-82. [PMID: 25893163 PMCID: PMC4398754 DOI: 10.1016/j.fob.2015.03.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 03/31/2015] [Accepted: 03/31/2015] [Indexed: 11/26/2022] Open
Abstract
The size and biomechanical properties of lipoproteins are tightly correlated with their structures/functions. While atomic force microscopy (AFM) has been used to image lipoproteins the force measurement of these nano-sized particles is missing. We detected that the sizes of LDL and HDL in liquid are close to the commonly known values. The Young's modulus of LDL or HDL is ∼0.4 GPa which is similar to that of some viral capsids or nanovesicles but greatly larger than that of various liposomes. The adhesive force of LDL or HDL is small (∼200 pN). The comparison of AFM detection in air and liquid was also performed which is currently lacking. Our data may provide useful information for better understanding and AFM detection of lipoproteins.
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Affiliation(s)
- Chaoye Gan
- Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, China ; College of Life Sciences, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Meiying Ao
- Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, China ; Department of Pharmacy, Science and Technology College, Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi 330025, China
| | - Zhanghua Liu
- Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, China ; College of Life Sciences, Nanchang University, Nanchang, Jiangxi 330031, China
| | - Yong Chen
- Nanoscale Science and Technology Laboratory, Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, China ; College of Life Sciences, Nanchang University, Nanchang, Jiangxi 330031, China
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Nanomechanical properties of the sea-water bacterium Paracoccus seriniphilus--a scanning force microscopy approach. Biointerphases 2015; 10:019004. [PMID: 25708634 DOI: 10.1116/1.4906862] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The measurement of force-distance curves on a single bacterium provides a unique opportunity to detect properties such as the turgor pressure under various environmental conditions. Marine bacteria are very interesting candidates for the production of pharmaceuticals, but are only little studied so far. Therefore, the elastic behavior of Paracoccus seriniphilus, an enzyme producing marine organism, is presented in this study. After a careful evaluation of the optimal measurement conditions, the spring constant and the turgor pressure are determined as a function of ionic strength and pH. Whereas the ionic strength changes the turgor pressure passively, the results give a hint that the change to acidic pH increases the turgor pressure by an active mechanism. Furthermore, it could be shown, that P. seriniphilus has adhesive protrusions outside its cell wall.
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Kontomaris SV, Yova D, Stylianou A, Balogiannis G. The effects of UV irradiation on collagen D-band revealed by atomic force microscopy. SCANNING 2015; 37:101-11. [PMID: 25521598 DOI: 10.1002/sca.21185] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 11/03/2014] [Accepted: 11/14/2014] [Indexed: 05/03/2023]
Abstract
The objective of this paper was to investigate the influence of UV irradiation on collagen D-band periodicity by using the AFM imaging and nanoindentation methods. It is well known than UV irradiation is one of the main factors inducing destabilization of collagen molecules. Due to the human's skin chronic exposure to sun light, the research concerning the influence of UV radiation on collagen is of great interest. The impact of UV irradiation on collagen can be studied in nanoscale using Atomic Force Microscopy (AFM). AFM is a powerful tool as far as surface characterization is concerned, due to its ability to relate high resolution imaging with mechanical properties. Hence, high resolution images of individual collagen fibrils and load-displacement curves on the overlapping and gap regions, under various time intervals of UV exposure, were obtained. The results demonstrated that the UV rays affect the height level differences between the overlapping and gap regions. Under various time intervals of UV exposure, the height difference between overlaps and gaps reduced from ~3.7 nm to ~0.8 nm and the fibril diameters showed an average of 8-10% reduction. In addition, the irradiation influenced the mechanical properties of collagen fibrils. The Young's modulus values were reduced per 66% (overlaps) and 61% (gaps) compared to their initial values. The observed alterations on the structural and the mechanical properties of collagen fibrils are probably a consequence of the polypeptide chain scission due to the impact of the UV irradiation.
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Affiliation(s)
- Stylianos V Kontomaris
- Biomedical Optics & Applied Biophysics Lab, Division of Electromagnetics, Electrooptics & Electronic Materials, School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytechniou, Athens, Greece; Interuniversity Postgraduate Programme on Biomedical Engineering, Faculty of Medicine of the University of Patras, School of Electrical and Computer Engineering and the School of Mechanical Engineering of the National Technical University of Athens, Athens, Greece
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Koushki N, Katbab AA, Tavassoli H, Jahanbakhsh A, Majidi M, Bonakdar S. A new injectable biphasic hydrogel based on partially hydrolyzed polyacrylamide and nanohydroxyapatite as scaffold for osteochondral regeneration. RSC Adv 2015. [DOI: 10.1039/c4ra10890f] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Fabrication of an injectable biphasic hydrogel based on partially hydrolyzed polyacrylamide (HPAM), nanocrystalline hydroxyapatite (nHAp), and chromium acetate (Cr(iii)) as a novel scaffold for osteochondral repair has been attempted.
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Affiliation(s)
- Newsha Koushki
- Polymer Engineering and Color Technology Department
- Amirkabir University of Technology
- Tehran
- Iran
- National Cell Bank of Iran
| | - Ali Asghar Katbab
- Polymer Engineering and Color Technology Department
- Amirkabir University of Technology
- Tehran
- Iran
| | | | | | - Mohammad Majidi
- National Cell Bank of Iran
- Pasteur Institute of Iran
- Tehran
- Iran
| | - Shahin Bonakdar
- National Cell Bank of Iran
- Pasteur Institute of Iran
- Tehran
- Iran
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47
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pH responsive poly amino-acid hydrogels formed via silk sericin templating. Int J Biol Macromol 2014; 70:565-71. [DOI: 10.1016/j.ijbiomac.2014.07.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 07/16/2014] [Accepted: 07/18/2014] [Indexed: 11/22/2022]
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48
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Abstract
There is an emerging need of nanotools able to quantify the mechanical
properties of single biological entities. A promising approach is the measurement of
the shifts of the resonant frequencies of ultrathin cantilevers induced by the
adsorption of the studied biological systems. Here, we present a detailed
theoretical analysis to calculate the resonance frequency shift induced by the
mechanical stiffness of viral nanotubes. The model accounts for the high
surface-to-volume ratio featured by single biological entities, the shape anisotropy
and the interfacial adhesion. The model is applied to the case in which tobacco
mosaic virus is randomly delivered to a silicon nitride cantilever. The theoretical
framework opens the door to a novel paradigm for biological spectrometry as well as
for measuring the Young's modulus of biological systems with minimal strains.
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49
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Zhang S, Aslan H, Besenbacher F, Dong M. Quantitative biomolecular imaging by dynamic nanomechanical mapping. Chem Soc Rev 2014; 43:7412-29. [DOI: 10.1039/c4cs00176a] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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50
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Kato K, Nakamura H, Yamauchi Y, Nakanishi K, Tomita M. Preparation of mesoporous silica thin films by photocalcination method and their adsorption abilities for various proteins. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2014; 40:42-8. [DOI: 10.1016/j.msec.2014.03.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 02/25/2014] [Accepted: 03/18/2014] [Indexed: 11/17/2022]
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