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Fu C, Ding C, Sun X, Fu A. Curcumin nanocapsules stabilized by bovine serum albumin-capped gold nanoclusters (BSA-AuNCs) for drug delivery and theranosis. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 87:149-154. [PMID: 29549944 DOI: 10.1016/j.msec.2017.12.028] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 12/12/2017] [Accepted: 12/26/2017] [Indexed: 01/03/2023]
Abstract
Nanotechnology plays an important role in the development of drug delivery, imaging, and diagnosis. In this study, nanocapsules containing protein-functionalized gold nanoclusters (AuNCs) as the shell and hydrophobic drug curcumin as the core were prepared as a tumor cell theranostic agent. After the nanocapsules were added into tumor cell media, they entered the cells with high efficiency and exhibited strong fluorescence within the cells. The results indicated that the nanocapsules were broken up in the cells and curcumin was released. Simultaneously, the nanocapsules exhibited significant inhibition effect against tumor cell proliferation in a concentration- and time-dependent manner, and the images of atomic force microscopy (AFM) showed that the cell morphology underwent obvious changes after the capsule treatment. Additionally, cell membrane appeared wrinkles after the cells treated with the nanocapsules, resulting in a rough cell surface, implying that the cytoskeleton would involve in the cell uptake of nanocapsules. Moreover, the AuNCs and curcumin in the system could exert synergistic effect on the inhibition of tumor cell growth and induction of cell apoptosis. The study highlights the potential of the system as a promising agent for drug delivery and tumor cell theranosis.
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Affiliation(s)
- Chen Fu
- College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, PR China
| | - Chizhu Ding
- College of Science, Huazhong Agricultural University, Wuhan 430070, PR China.
| | - Xianchao Sun
- College of Plant Protection, Southwest University, Chongqing 400715, PR China
| | - Ailing Fu
- College of Pharmaceutical Sciences, Southwest University, Chongqing 400715, PR China.
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Dror Y, Sorkin R, Brand G, Boubriak O, Urban J, Klein J. The effect of the serum corona on interactions between a single nano-object and a living cell. Sci Rep 2017; 7:45758. [PMID: 28383528 PMCID: PMC5382918 DOI: 10.1038/srep45758] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Accepted: 03/06/2017] [Indexed: 12/20/2022] Open
Abstract
Nanoparticles (NPs) which enter physiological fluids are rapidly coated by proteins, forming a so-called corona which may strongly modify their interaction with tissues and cells relative to the bare NPs. In this work the interactions between a living cell and a nano-object, and in particular the effect on this of the adsorption of serum proteins, are directly examined by measuring the forces arising as an Atomic Force Microscope tip (diameter 20 nm) - simulating a nano-object - approaches and contacts a cell. We find that the presence of a serum protein corona on the tip strongly modifies the interaction as indicated by pronounced increase in the indentation, hysteresis and work of adhesion compared to a bare tip. Classically one expects an AFM tip interacting with a cell surface to be repelled due to cell elastic distortion, offset by tip-cell adhesion, and indeed such a model fits the bare-tip/cell interaction, in agreement with earlier work. However, the force plots obtained with serum-modified tips are very different, indicating that the cell is much more compliant to the approaching tip. The insights obtained in this work may promote better design of NPs for drug delivery and other nano-medical applications.
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Affiliation(s)
- Yael Dror
- Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel.,Department of Physical and Theoretical Chemistry, Oxford University, Oxford OX1 3QZ, United Kingdom
| | - Raya Sorkin
- Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Guy Brand
- Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Olga Boubriak
- University Laboratory of Physiology, Oxford University, Parks Road, Oxford OX1 3PT, United Kingdom
| | - Jill Urban
- University Laboratory of Physiology, Oxford University, Parks Road, Oxford OX1 3PT, United Kingdom
| | - Jacob Klein
- Materials and Interfaces Department, Weizmann Institute of Science, Rehovot 76100, Israel.,Department of Physical and Theoretical Chemistry, Oxford University, Oxford OX1 3QZ, United Kingdom
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3
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Modeling of Integrated Nanoneedle-Microfluidic System for Single Cell Temperature Measurement. APPLIED SCIENCES-BASEL 2016. [DOI: 10.3390/app6120339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Tian J, Tu C, Liang Y, Zhou J, Ye X. Study of laser uncaging induced morphological alteration of rat cortical neurites using atomic force microscopy. J Neurosci Methods 2015; 253:151-60. [PMID: 26149288 DOI: 10.1016/j.jneumeth.2015.06.018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 06/18/2015] [Accepted: 06/26/2015] [Indexed: 11/28/2022]
Abstract
Activity-dependent structural remodeling is an important aspect of neuronal plasticity. In the previous researches, neuronal structure variations resulting from external interventions were detected by the imaging instruments such as the fluorescence microscopy, the scanning/transmission electron microscopy (SEM/TEM) and the laser confocal microscopy. In this article, a new platform which combined the photochemical stimulation with atomic force microscopy (AFM) was set up to detect the activity-dependent structural remodeling. In the experiments, the cortical neurites on the glass coverslips were stimulated by locally uncaged glutamate under the ultraviolet (UV) laser pulses, and a calcium-related structural collapse of neurites (about 250 nm height decrease) was observed by an AFM. This was the first attempt to combine the laser uncaging with AFM in living cell researches. With the advantages of highly localized stimulation (<5 μm), super resolution imaging (<3.8 nm), and convenient platform building, this system was suitable for the quantitative observation of the neuron mechanical property variations and morphological alterations modified by neural activities under different photochemical stimulations, which would be helpful for studying physiological and pathological mechanisms of structural and functional changes induced by the biomolecule acting.
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Affiliation(s)
- Jian Tian
- Biosensor National Special Laboratory, Key Laboratory of BME of the Ministry of Education, Zhejiang University, Hangzhou 310027, PR China; Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, PR China.
| | - Chunlong Tu
- Biosensor National Special Laboratory, Key Laboratory of BME of the Ministry of Education, Zhejiang University, Hangzhou 310027, PR China; Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, PR China.
| | - Yitao Liang
- Biosensor National Special Laboratory, Key Laboratory of BME of the Ministry of Education, Zhejiang University, Hangzhou 310027, PR China; Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, PR China.
| | - Jian Zhou
- Biosensor National Special Laboratory, Key Laboratory of BME of the Ministry of Education, Zhejiang University, Hangzhou 310027, PR China; Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, PR China.
| | - Xuesong Ye
- Biosensor National Special Laboratory, Key Laboratory of BME of the Ministry of Education, Zhejiang University, Hangzhou 310027, PR China; Department of Biomedical Engineering, Zhejiang University, Hangzhou 310027, PR China.
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5
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Thermo-mechanical properties of the cell surface assessed by atomic force microscopy. Micron 2012; 43:1232-8. [DOI: 10.1016/j.micron.2012.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2011] [Revised: 03/30/2012] [Accepted: 04/01/2012] [Indexed: 01/22/2023]
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6
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Atomic force microscopy analysis shows surface structure changes in carvacrol-treated bacterial cells. Res Microbiol 2011; 162:164-72. [DOI: 10.1016/j.resmic.2010.11.006] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Accepted: 09/15/2010] [Indexed: 11/20/2022]
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7
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LASALVIA M, PERNA G, MEZZENGA E, MIGLIORINI E, LAZZARINO M, L’ABBATE N, CAPOZZI V. Atomic force microscopy investigation of morphological changes in living keratinocytes treated with HgCl2 at not cytotoxic doses. J Microsc 2011; 243:40-6. [DOI: 10.1111/j.1365-2818.2010.03479.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Assessing mutant huntingtin fragment and polyglutamine aggregation by atomic force microscopy. Methods 2010; 53:275-84. [PMID: 21187152 DOI: 10.1016/j.ymeth.2010.12.028] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 12/18/2010] [Accepted: 12/18/2010] [Indexed: 01/01/2023] Open
Abstract
Huntington disease (HD), a neurodegenerative disorder, is caused by an expansion of more than 35-40 polyglutamine (polyQ) repeats located near the N-terminus of the huntingtin (htt) protein. The expansion of the polyQ domain results in the ordered assembly of htt fragments into fibrillar aggregates that are the main constituents of inclusion bodies, which are a hallmark of the disease. This paper describes protocols for studying the aggregation of mutant htt fragments and synthetic polyQ peptides with atomic force microscopy (AFM). Ex situ AFM is used to characterize aggregate formation in protein incubation as a function of time. Methods to quickly and unambiguously distinguish specific aggregate species from complex, heterogeneous aggregation reactions based on simple morphological features are presented. Finally, the application of time lapse atomic force microscopy in solution is presented for studying synthetic model polyQ peptides, which allows for tracking the formation and fate of individual aggregates on surfaces over time. This ability allows for dynamic studies of the aggregation process and direct observation of the interplay between different types of aggregates.
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Wang X, Ye Q, Liu J, Liu X, Zhou F. Low surface energy surfaces from self-assembly of perfluoropolymer with sticky functional groups. J Colloid Interface Sci 2010; 351:261-6. [DOI: 10.1016/j.jcis.2010.04.051] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2010] [Revised: 04/19/2010] [Accepted: 04/21/2010] [Indexed: 10/19/2022]
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Hsu SH, Lo YY, Tung JY, Ko YC, Sun YJ, Hung CC, Yang CW, Tseng FG, Fu CC, Pan RL. Leptospiral outer membrane lipoprotein LipL32 binding on toll-like receptor 2 of renal cells as determined with an atomic force microscope. Biochemistry 2010; 49:5408-17. [PMID: 20513152 DOI: 10.1021/bi100058w] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Leptopirosis is a renal disease caused by pathogenic Leptospira that primarily infects the renal proximal tubules, consequently resulting in severe tubular injuries and malfunctions. The protein extracted from the outer membrane of this pathogenic strain contains a major component of a 32 kDa lipoprotein (LipL32), which is absent in the counter membrane of nonpathogenic strains and has been identified as a crucial factor for host cell infection. Previous studies showed that LipL32 induced inflammatory responses and interacted with the extracellular matrix (ECM) of the host cell. However, the exact relationship between LipL32-mediated inflammatory responses and ECM binding is still unknown. In this study, an atomic force microscope with its tip modified by purified LipL32 was used to assess the interaction between LipL32 and cell surface receptors. Furthermore, an antibody neutralization technique was employed to identify Toll-like receptor 2 (TLR2) but not TLR4 as the major target of LipL32 attack. The interaction force between LipL32 and TLR2 was measured as approximately 59.5 +/- 8.7 pN, concurring with the theoretical value for a single-pair molecular interaction. Moreover, transformation of a TLR deficient cell line with human TLR2 brought the interaction force from the basal level to approximately 60.4 +/- 11.5 pN, confirming unambiguously TLR2 as counter receptor for LipL32. The stimulation of CXCL8/IL-8 expression by full-length LipL32 as compared to that without the N-terminal signal peptide domain suggests a significant role of the signal peptide of the protein in the inflammatory responses. This study provides direct evidence that LipL32 binds to TLR2, but not TLR4, on the cell surface, and a possible mechanism for the virulence of leptospirosis is accordingly proposed.
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Affiliation(s)
- Shen-Hsing Hsu
- Department of Life Science and Institute of Bioinformatics and Structural Biology, College of Life Science, National Tsing Hua University, Hsin Chu 30013, Taiwan, Republic of China
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A novel probe–sample separation estimation scheme for atomic force microscopy. Ultramicroscopy 2010; 110:622-5. [DOI: 10.1016/j.ultramic.2010.02.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Städler B, Blättler TM, Franco-Obregón A. Time-lapse imaging of in vitro myogenesis using atomic force microscopy. J Microsc 2010; 237:63-9. [PMID: 20055919 DOI: 10.1111/j.1365-2818.2009.03302.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Myoblast therapy relies on the integration of skeletal muscle stem cells into distinct muscular compartments for the prevention of clinical conditions such as heart failure, or bladder dysfunction. Understanding the fundamentals of myogenesis is hence crucial for the success of these potential medical therapies. In this report, we followed the rearrangement of the surface membrane structure and the actin cytoskeletal organization in C2C12 myoblasts at different stages of myogenesis using atomic force microscopy (AFM) and confocal laser scanning microscopy (CLSM). AFM imaging of living myoblasts undergoing fusion unveiled that within minutes of making cell-cell contact, membrane tubules appear that unite the myoblasts and increase in girth as fusion proceeds. CLSM identified these membrane tubules as built on scaffolds of actin filaments that nucleate at points of contact between fusing myoblasts. In contrast, similarly behaving membrane tubules are absent during cytokinesis. The results from our study in combination with recent findings in literature further expand the understanding of the biochemical and membrane structural rearrangements involved in the two fundamental cellular processes of division and fusion.
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Affiliation(s)
- B Städler
- Laboratory of Biosensors and Bioelectronics, Mechanobiology Laboratory, Institute for Biomedical Engineering, ETH Zurich, Switzerland
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