1
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Guo Q, Su Z, Xiang D, Yu B, Wang D, Fan Y, Zheng F, Chen W. Fabrication of six-atom Pd clusters regulated with different short ligands and their surface structure-dependent catalytic activities. J Colloid Interface Sci 2024; 662:242-249. [PMID: 38350347 DOI: 10.1016/j.jcis.2024.02.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/13/2024] [Accepted: 02/06/2024] [Indexed: 02/15/2024]
Abstract
As model catalysts, it is necessary to study the relationship between the structure and properties of ultra-small metal nanoclusters (MNCs) and to reduce their steric hindrance as much as possible, e.g. preparing ultrasmall MNCs protected by ultra-short ligands. However, it is challenging to attain various MNCs with the same cores but different surface stabilizing ligands. Additionally, shortening the chains of protecting ligands will lead to larger MNC cores. Here, four different Pd NCs (Pd6(SC4H9)12, Pd6(SC8H17)12, Pd6(SC6(C2)H17)12 and Pd6(SC6H13)12) were successfully synthesized by a slow synthesis process. All these clusters consist of six Pd atoms and are stabilized by 12 thiols with different chain lengths and steric hindrance. The catalytic properties of the as-prepared Pd6 NCs were evaluated using the catalytic reduction of p-nitroaniline to p-phenylenediamine as a model reaction. The outcomes indicated that shortening the chain length of the protecting thiols could enhance the catalytic activity of the Pd6 NCs. Notably, stable and active ultra-small Pd6 clusters stabilized by ultra-short ligands (HSC4H9) were successfully synthesized. Although the performance of Pd6(SC4H9)12 clusters protected by the ultra-short thiols is lower than that of commercial palladium on carbon (Pd/C), they display higher stability. Interestingly, the activity of Pd6 NCs protected by ethyl-branched alkane thiols is also better than that of Pd6 NCs protected by the alkane thiol ligands with the same chain length or the same number of carbon numbers. This work provides clear evidence that the catalytic activity of atomically precise MNCs can be controlled by regulating the surface stabilizing ligands.
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Affiliation(s)
- Qian Guo
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Ziyun Su
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Dong Xiang
- New Energy Research Institute, School of Environment and Energy, South China University of Technology, Higher Education Mega Center, 382 East Waihuan Road, Guangzhou 510006, China
| | - Beirong Yu
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Di Wang
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Youjun Fan
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China
| | - Fuqin Zheng
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
| | - Wei Chen
- School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin 541004, China.
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2
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Qu M, Zhang FQ, Zhang GL, Qiao MM, Zhao LX, Li SL, Walter M, Zhang XM. Cocrystallization-driven Formation of fcc-based Ag 110 Nanocluster with Chinese Triple Luban Lock Shape. Angew Chem Int Ed Engl 2024; 63:e202318390. [PMID: 38117040 DOI: 10.1002/anie.202318390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 12/15/2023] [Accepted: 12/18/2023] [Indexed: 12/21/2023]
Abstract
Luban locks with mortise and tenon structure have structural diversity and architectural stability, and it is extremely challenging to synthesize Luban lock-like structures at the molecular level. In this work, we report the cocrystallization of two structurally related atom-precise fcc silver nanoclusters Ag110 (SPhF)48 (PPh3 )12 (Ag110 ) and Ag14 (μ6 -S)(SPhF)12 (PPh3 )8 (Ag14 ). It is worth noting that the Ag110 cluster is the first compound to simulate the complex Luban lock structure at the molecular level. Meanwhile, Ag110 is the largest known fcc-based silver nanocluster, so far, there is no precedent for fcc silver nanocluster with more than 100 silver atoms. DFT calculations show that Ag110 is a 58-electron superatom with an electronically closed shell1S2 1P6 1D10 2S2 1F14 2P6 1G18 . Ag110 ⋅Ag14 can rapidly catalyze the reduction of 4-nitrophenol within 4 minutes. In addition, Ag110 presents clear structural evidence to reveal the critical size and mechanism of the transformation of metal core from fcc stacking to quasi-spherical superatom. This research work provides an important structural model for studying the nucleation mechanism and structural assembly of silver nanoclusters.
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Affiliation(s)
- Mei Qu
- Key Laboratory of Magnetic Molecules and Magnetic Information of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030031, P. R. China
| | - Fu-Qiang Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030031, P. R. China
| | - Gai-Li Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030031, P. R. China
| | - Miao-Miao Qiao
- Key Laboratory of Magnetic Molecules and Magnetic Information of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030031, P. R. China
| | - Li-Xiang Zhao
- Key Laboratory of Magnetic Molecules and Magnetic Information of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030031, P. R. China
| | - Shi-Li Li
- Key Laboratory of Magnetic Molecules and Magnetic Information of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030031, P. R. China
| | - Michael Walter
- FIT Freiburg Centre for Interactive Materials and Bioinspired Technologies, University of Freiburg, 79110, Freiburg, Germany
- Cluster of Excellence livMatS @ FIT, 79110, Freiburg, Germany
- Fraunhofer IWM, MikroTribologie Centrum μTC, 79108, Freiburg, Germany
| | - Xian-Ming Zhang
- Key Laboratory of Magnetic Molecules and Magnetic Information of Ministry of Education, School of Chemistry and Material Science, Shanxi Normal University, Taiyuan, Shanxi, 030031, P. R. China
- College of Chemistry, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, P. R. China
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Chandrashekar P, Sardar G, Sengupta T, Reber AC, Mondal PK, Kabra D, Khanna SN, Deria P, Mandal S. Modulation of Singlet-Triplet Gap in Atomically Precise Silver Cluster-Assembled Material. Angew Chem Int Ed Engl 2024; 63:e202317345. [PMID: 38078805 DOI: 10.1002/anie.202317345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Indexed: 12/30/2023]
Abstract
Silver cluster-based solids have garnered considerable attention owing to their tunable luminescence behavior. While surface modification has enabled the construction of stable silver clusters, controlling interactions among clusters at the molecular level has been challenging due to their tendency to aggregate. Judicious choice of stabilizing ligands becomes pivotal in crafting a desired assembly. However, detailed photophysical behavior as a function of their cluster packing remained unexplored. Here, we modulate the packing pattern of Ag12 clusters by varying the nitrogen-based ligand. CAM-1 formed through coordination of the tritopic linker molecule and NC-1 with monodentate pyridine ligand; established via non-covalent interactions. Both the assemblies show ligand-to-metal-metal charge transfer (LMMCT) based cluster-centered emission band(s). Temperature-dependent photoluminescence spectra exhibit blue shifts at higher temperatures, which is attributed to the extent of the thermal reverse population of the S1 state from the closely spaced T1 state. The difference in the energy gap (ΔEST ) dictated by their assemblies played a pivotal role in the way that Ag12 cluster assembly in CAM-1 manifests a wider ΔEST and thus requires higher temperatures for reverse intersystem crossing (RISC) than assembly of NC-1. Such assembly-defined photoluminescence properties underscore the potential toolkit to design new cluster- assemblies with tailored optoelectronic properties.
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Affiliation(s)
- Priyanka Chandrashekar
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala, 695551, India
| | - Gopa Sardar
- Department of Physics, Indian Institute of Technology Bombay Powai, Mumbai, 400076, India
| | - Turbasu Sengupta
- Department of Physics, Virginia Commonwealth University, Richmond, VA-23220, USA
| | - Arthur C Reber
- Department of Physics, Virginia Commonwealth University, Richmond, VA-23220, USA
| | - Pradip Kumar Mondal
- Elettra-Sincrotrone Trieste, S.S. 14 Km 163.5 in Area Science Park, Basovizza, 34149, Trieste, Italy
| | - Dinesh Kabra
- Department of Physics, Indian Institute of Technology Bombay Powai, Mumbai, 400076, India
| | - Shiv N Khanna
- Department of Physics, Virginia Commonwealth University, Richmond, VA-23220, USA
| | - Pravas Deria
- School of Chemical & Biomolecular Science, Southern Illinois University, 1245 Lincoln Drive, Carbondale, IL-62901, USA
| | - Sukhendu Mandal
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Kerala, 695551, India
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4
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Wu W, Li Y, Wu X, Liang J, You W, He X, Feng Q, Li T, Jia X. Carnosic acid nanocluster-based framework combined with PD-1 inhibitors impeded tumorigenesis and enhanced immunotherapy in hepatocellular carcinoma. Funct Integr Genomics 2024; 24:5. [PMID: 38182693 DOI: 10.1007/s10142-024-01286-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Revised: 11/15/2023] [Accepted: 01/01/2024] [Indexed: 01/07/2024]
Abstract
Clinically, the immune checkpoint inhibitor anti-PD-1 antibody has shown a certain effect in the treatment of hepatocellular carcinoma (HCC), which is limited to a small number of patients with HCC. This study aims to reveal whether carnosic acid nanocluster-based framework (CA-NBF) has a sensitization effect on anti-PD-1 antibody in the treatment of HCC at the cellular and animal levels. MHCC97H cells were treated with CA-NBF, anti-PD-1 and their combination. The effects of CA-NBF and anti-PD-1 on cell proliferation, cell cycle, apoptosis, invasion, and migration were evaluated by MTT assay, flow cytometry, and scratch test. The effects of CA-NBF and anti-PD-1 on Wnt/β-catenin signaling pathway in MHCC97H cells were detected. A BALB/C nude mouse model of hepatocellular carcinoma was established, and the tumor growth was observed at different time points. The expression of cytotoxic T lymphocyte and helper T lymphocyte markers CD8 and CD4 in tumor tissues was detected by immunohistochemistry. Western blotting was used to detect the Wnt/β-catenin signaling pathway proteins (Wnt-3a, β-catenin, and GSK-3β) level in tumor tissues after CA-NBF and anti-PD-1 treatment. CA-NBF activity was significantly higher than CA, which could prominently reduce the proliferation, migration and invasion of MHCC97H cells and enhance apoptosis by inactivating Wnt/β-catenin signaling pathway. CA-NBF combined with anti-PD-1 antibody further enhanced cell proliferation, migration, invasion and pro-apoptosis but had no significant effect on Wnt/β-catenin signaling pathway. CA-NBF in vivo improved the tumor response to PD1 immune checkpoint blockade in HCC, manifested by reducing tumor size and weight, promoting CD4 and CD8 expression. CA-NBF combined with anti-PD-1 have stronger immunomodulatory and anticancer effects without increasing biological toxicity.
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Affiliation(s)
- Wenhua Wu
- Department of Infectious Diseases, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi'wu Road,, Xi'an, 710004, Shaanxi, China.
| | - Yaping Li
- Department of Infectious Diseases, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi'wu Road,, Xi'an, 710004, Shaanxi, China
| | - Xiaokang Wu
- Clinical Laboratory, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
| | - Junrong Liang
- Department of Gastroenterology, Tangdu Hospital, The Fourth Military Medical University, Xi'an, 710038, Shaanxi, China
| | - Weiming You
- National & Local Joint Engineering Research Center of Biodiagnosis and Biotherapy, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, 710004, Shaanxi, China
- Department of Tumor and Immunology in Precision Medical Institute, Western China Science and Technology Innovation Port, Xi'an, 710004, Shaanxi, China
| | - Xinyuan He
- Department of Infectious Diseases, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi'wu Road,, Xi'an, 710004, Shaanxi, China
| | - Qinhui Feng
- Department of Infectious Diseases, Tangdu Hospital, The Fourth Military Medical University, Xi'an, 710038, Shaanxi, China
| | - Ting Li
- Department of Infectious Diseases, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi'wu Road,, Xi'an, 710004, Shaanxi, China
| | - Xiaoli Jia
- Department of Infectious Diseases, The Second Affiliated Hospital of Xi'an Jiaotong University, No. 157, Xi'wu Road,, Xi'an, 710004, Shaanxi, China.
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5
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Zhao J, Ziarati A, Rosspeintner A, Bürgi T. Anchoring of Metal Complexes on Au 25 Nanocluster for Enhanced Photocoupled Electrocatalytic CO 2 Reduction. Angew Chem Int Ed Engl 2024; 63:e202316649. [PMID: 37988181 DOI: 10.1002/anie.202316649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 11/20/2023] [Accepted: 11/20/2023] [Indexed: 11/23/2023]
Abstract
Atomically precise Au nanoclusters (NCs) with discrete energy levels can be used as photosensitizers for CO2 reduction. However, tight ligand capping of Au NCs hinders CO2 adsorption on its active sites. Here, a new hybrid material is obtained by anchoring of thiol functionalized terpyridine metal complexes (metal=Ru, Ni, Fe, Co) on Au NCs by ligand exchange reactions (LERs). The anchoring of Ru and Ni complexes on Au25 NC (Au25 -Ru and Au25 -Ni) leads to adequate CO2 to CO conversion for photocoupled electrocatalytic CO2 reduction (PECR) in terms of high selectivity, with Faradaic efficiency of CO (FECO ) exceeding 90 % in a wide potential range, remarkable activity (CO production rate up to two times higher than that for pristine Au25 PET18 ) and extremely large turnover frequencies (TOFs, 63012 h-1 at -0.97 V for Au25 -Ru and 69989 h-1 at -1.07 V vs. RHE for Au25 -Ni). Moreover, PECR stability test indicates the excellent long-term stability of the modified NCs in contrast with pristine Au NCs. The present approach offers a novel strategy to enhance PECR activity and selectivity, as well as to improve the stability of Au NCs under light illumination, which paves the way for highly active and stable Au NCs catalysts.
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Affiliation(s)
- Jiangtao Zhao
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland
| | - Abolfazl Ziarati
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland
| | - Arnulf Rosspeintner
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland
| | - Thomas Bürgi
- Department of Physical Chemistry, University of Geneva, 30 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland
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6
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Yang Y, Wen J, Liu L. Heterogeneity of dispersed species in nickel-loaded carbon-based catalysts for near-infrared photoresponsive synergistic antimicrobial therapy. J Colloid Interface Sci 2023; 652:380-387. [PMID: 37604050 DOI: 10.1016/j.jcis.2023.08.100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 08/11/2023] [Accepted: 08/16/2023] [Indexed: 08/23/2023]
Abstract
The development of novel efficient, safe antimicrobial strategies is an urgent need, as the misuse of antibiotics has become a significant threat to human health. Therefore, we have loaded metal Ni with environmentally friendly carbon black as a substrate, with species varying from single atoms to nanoclusters and nanoparticles. The results obtained from the antimicrobial systems and the role of different types of metal species in the photosensitized antimicrobial reactions were compared to better understand the catalytic behavior of different metal entities (single atoms, nanoclusters, and nanoparticles). Furthermore, the antimicrobial mechanisms of these materials were described by physical and chemical characterization, biological experiments, and theoretical calculations. Such systematic studies provide new ideas and prospects for developing more efficient and environmentally friendly antimicrobial materials.
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Affiliation(s)
- Yang Yang
- Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jinghong Wen
- School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252000, China.
| | - Lu Liu
- Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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7
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Das AK, Biswas S, Kayal A, Reber AC, Bhandary S, Chopra D, Mitra J, Khanna SN, Mandal S. Two-Dimensional Silver-Chalcogenolate-Based Cluster-Assembled Material: A p-type Semiconductor. Nano Lett 2023; 23:8923-8931. [PMID: 37725097 DOI: 10.1021/acs.nanolett.3c02269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
We have synthesized and characterized a new two-dimensional honeycomb architecture resembling a single-layer of atomically precise silver cluster-assembled material (CAM), [Ag12(StBu)6(CF3COO)6(4,4'-azopyridine)3] (Ag12-azo-bpy). The interlayer noncovalent van der Waals interactions within the single-crystals were successfully disrupted, leading to the creation of this unique structure. The optimized Ag12-azo-bpy CAM demonstrates a valence band that is localized on the Ag12 cluster node situated near the Fermi energy level. This localization induces electron injection from the linker to the cluster node, facilitating efficient charge transportation along the plane. Exploiting this single-layer structure as a distinctive platform for p-type channel material, it was employed in a field-effect transistor configuration. Remarkably, the transistor exhibits a high hole mobility of 1.215 cm2 V-1 s-1 and an impressive ON/OFF current ratio of ∼4500 at room-temperature.
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Affiliation(s)
- Anish Kumar Das
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India
| | - Sourav Biswas
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India
| | - Arijit Kayal
- School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India
| | - Arthur C Reber
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23220, United States
| | - Subhrajyoti Bhandary
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India
| | - Deepak Chopra
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Madhya Pradesh 462066, India
| | - Joy Mitra
- School of Physics, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India
| | - Shiv N Khanna
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23220, United States
| | - Sukhendu Mandal
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, Kerala 695551, India
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8
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Dong C, Huang RW, Sagadevan A, Yuan P, Gutiérrez-Arzaluz L, Ghosh A, Nematulloev S, Alamer B, Mohammed OF, Hussain I, Rueping M, Bakr OM. Isostructural Nanocluster Manipulation Reveals Pivotal Role of One Surface Atom in Click Chemistry. Angew Chem Int Ed Engl 2023; 62:e202307140. [PMID: 37471684 DOI: 10.1002/anie.202307140] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 07/15/2023] [Accepted: 07/19/2023] [Indexed: 07/22/2023]
Abstract
Elucidating single-atom effects on the fundamental properties of nanoparticles is challenging because single-atom modifications are typically accompanied by appreciable changes to the overall particle's structure. Herein, we report the synthesis of a [Cu58 H20 PET36 (PPh3 )4 ]2+ (Cu58 ; PET: phenylethanethiolate; PPh3 : triphenylphosphine) nanocluster-an atomically precise nanoparticle-that can be transformed into the surface-defective analog [Cu57 H20 PET36 (PPh3 )4 ]+ (Cu57 ). Both nanoclusters are virtually identical, with five concentric metal shells, save for one missing surface copper atom in Cu57 . Remarkably, the loss of this single surface atom drastically alters the reactivity of the nanocluster. In contrast to Cu58 , Cu57 shows promising activity for click chemistry, particularly photoinduced [3+2] azide-alkyne cycloaddition (AAC), which is attributed to the active catalytic site in Cu57 after the removal of one surface copper atom. Our study not only presents a unique system for uncovering the effect of a single-surface atom modification on nanoparticle properties but also showcases single-atom surface modification as a powerful means for designing nanoparticle catalysts.
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Affiliation(s)
- Chunwei Dong
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Ren-Wu Huang
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Arunachalam Sagadevan
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Peng Yuan
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Luis Gutiérrez-Arzaluz
- Advanced Membranes and Porous Materials Center (AMPMC), KAUST Catalysis Center (KCC), Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Atanu Ghosh
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Saidkhodzha Nematulloev
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Badriah Alamer
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Omar F Mohammed
- Advanced Membranes and Porous Materials Center (AMPMC), KAUST Catalysis Center (KCC), Physical Sciences and Engineering Division, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Irshad Hussain
- Department of Chemistry & Chemical Engineering, Syed Babar Ali School of Science & Engineering, Lahore University of Management Sciences (LUMS), DHA, 54792, Lahore, Pakistan
| | - Magnus Rueping
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
| | - Osman M Bakr
- KAUST Catalysis Center (KCC), Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), 23955-6900, Thuwal, Saudi Arabia
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9
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Luo GG, Pan ZH, Han BL, Dong GL, Deng CL, Azam M, Tao YW, He J, Sun CF, Sun D. Total Structure, Electronic Structure and Catalytic Hydrogenation Activity of Metal-Deficient Chiral Polyhydride Cu 57 Nanoclusters. Angew Chem Int Ed Engl 2023; 62:e202306849. [PMID: 37469101 DOI: 10.1002/anie.202306849] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/16/2023] [Accepted: 07/17/2023] [Indexed: 07/21/2023]
Abstract
Accurate identifying and in-depth understanding of the defect sites in a working nanomaterial could hinge on establishing specific defect-activity relationships. Yet, atomically precise coinage-metal nanoclusters (NCs) possessing surface vacancy defects are scarce primarily owing to challenges in the synthesis and isolation of such defective NCs. Herein we report a mixed-ligand strategy to synthesizing an intrinsically chiral and metal-deficient copper hydride-rich NC [Cu57 H20 (PET)36 (TPP)4 ]+ (Cu57 H20 ). Its total structure (including hydrides) and electronic structure are well established by combined experimental and computational results. Crystal structure reveals Cu57 H20 features a cube-like Cu8 kernel embedded in a corner-missing metal-ligand shell of Cu49 (PET)36 (TPP)4 . Single Cu vacancy defect site occurs at one corner of the shell, evocative of mono-lacunary polyoxometalates. Theoretical calculations demonstrate that the above-mentioned point vacancy causes one surface hydride exposed as an interfacial capping μ3 -H- , which is accessible in chemical reaction, as proved by deuterated experiment. Moreover, Cu57 H20 shows catalytic activity in the hydrogenation of nitroarene. The success of this work opens the way for the research on well-defined chiral metal-deficient Cu and other metal NCs, including exploring their application in asymmetrical catalysis.
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Affiliation(s)
- Geng-Geng Luo
- College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P. R. China
| | - Zhong-Hua Pan
- College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P. R. China
| | - Bao-Liang Han
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
| | - Guang-Lei Dong
- College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P. R. China
| | - Cheng-Long Deng
- College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P. R. China
| | - Mohammad Azam
- Department of Chemistry, College of Science, King Saud University, P. O. Box 2455, Riyadh, 11451, Saudi Arabia
| | - Yun-Wen Tao
- Department of Chemistry, Southern Methodist University, 3215 Daniel Avenue, Dallas, TX, 75275-0314, USA
| | - Jiao He
- College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P. R. China
| | - Cun-Fa Sun
- College of Materials Science and Engineering, Huaqiao University, Xiamen, 361021, P. R. China
| | - Di Sun
- School of Chemistry and Chemical Engineering, State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China
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Antoine R, Broyer M, Dugourd P. Metal nanoclusters: from fundamental aspects to electronic properties and optical applications. Sci Technol Adv Mater 2023; 24:2222546. [PMID: 37363801 PMCID: PMC10286677 DOI: 10.1080/14686996.2023.2222546] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/10/2023] [Revised: 05/05/2023] [Accepted: 05/31/2023] [Indexed: 06/28/2023]
Abstract
Monolayer-protected noble metal clusters, also called nanoclusters, can be produced with the atomic precision and in large-scale quantity and are playing an increasingly important role in the field of nanoscience. To outline the origin and the perspectives of this new field, we overview the main results obtained on free metal clusters produced in gas phase including mainly electronic properties, the giant atom concept, the optical properties, briefly the role of the metal atom (alkali, divalent, noble metal) and finally the atomic structure of clusters. We also discuss the limitations of the free clusters. Then, we describe the field of monolayer-protected metal clusters, the main results, the new offered perspectives, the added complexity, and the role of the ligand beyond the superatom concept.
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Affiliation(s)
- Rodophe Antoine
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
| | - Michel Broyer
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
| | - Philippe Dugourd
- Univ Lyon, Univ Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France
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11
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He Y, Dai L, Hu L, Lei Y, Wang M. Ratiometric fluorescent detection of total phosphates in frozen shrimp samples using catalytic active Zr(IV) modified gold nanoclusters. Food Chem 2023; 426:136564. [PMID: 37327763 DOI: 10.1016/j.foodchem.2023.136564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Revised: 05/16/2023] [Accepted: 06/05/2023] [Indexed: 06/18/2023]
Abstract
Phosphate salts are important food additives in a variety of foods. In this study, the Zr(IV) modified gold nanoclusters (Au NCs) were prepared for ratiometric fluorescent sensing of phosphate additives in seafood samples. Compared with bare Au NCs, the synthesized Zr(IV)/Au NCs showed stronger orange fluorescence at 610 nm. On the other hand, the Zr(IV)/Au NCs retained the phosphatase-like activity of Zr(IV) ions and could catalyze the hydrolysis of fluorescent substrate 4-methylumbelliferyl phosphate to produce blue emission at 450 nm. The addition of phosphate salts could effectively inhibit the catalytic activity of Zr(IV)/Au NCs, resulting the fluorescence decrease at 450 nm. However, the fluorescence at 610 nm almost unchanged upon the addition of phosphates. Based on this finding, the ratiometric detection of phosphates using the fluorescence intensity ratio (I450/I610) was demonstrated. The method has been further applied for sensing total phosphates in frozen shrimp samples with satisfactory results.
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Affiliation(s)
- Yuting He
- Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China
| | - Ling Dai
- Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China
| | - Lianzhe Hu
- Chongqing Key Laboratory of Green Synthesis and Applications, College of Chemistry, Chongqing Normal University, Chongqing 401331, China.
| | - Yao Lei
- School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China
| | - Min Wang
- School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China.
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12
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Tang L, Luo Y, Ma X, Wang B, Ding M, Wang R, Wang P, Pei Y, Wang S. Poly-Hydride [Au I 7 (PPh 3 ) 7 H 5 ](SbF 6 ) 2 cluster complex: Structure, Transformation, and Electrocatalytic CO 2 Reduction Properties. Angew Chem Int Ed Engl 2023; 62:e202300553. [PMID: 36655888 DOI: 10.1002/anie.202300553] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2023] [Revised: 01/18/2023] [Accepted: 01/19/2023] [Indexed: 01/20/2023]
Abstract
Hydride AuI bonds are labile due to the mismatch in electric potential of an oxidizing metal and reducing ligand, and therefore the structure and structure-activity relationships of nanoclusters that contain them are seldom studied. Herein, we report the synthesis and characterization of [Au7 (PPh3 )7 H5 ](SbF6 )2 (abbrev. Au7 H5 2+ ), an Au cluster complex containing five hydride ligands, which decomposed to give [Au8 (PPh3 )7 ]2+ (abbrev. Au8 2+ ) upon exposure to light (300 to 450 nm). The valence state of AuI and H- was verified by density functional theory (DFT) calculations, NMR, UV/Vis and XPS. The two nanoclusters behaved differently in the electrocatalytic CO2 reduction reaction (CO2 RR): Au7 H5 2+ exhibited 98.2 % selectivity for H2 , whereas Au8 2+ was selective for CO (73.5 %). Further DFT calculations showed that the H- ligand inhibited the CO2 RR process compared with the electron-donor H.
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Affiliation(s)
- Li Tang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
| | - Yuting Luo
- Department of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiangtan University, Xiangtan, Hunan, 411105, P. R. China
| | - Xiaoshuang Ma
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
| | - Bin Wang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
| | - Mei Ding
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
| | - Ru Wang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
| | - Pu Wang
- Department of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiangtan University, Xiangtan, Hunan, 411105, P. R. China
| | - Yong Pei
- Department of Chemistry, Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, Xiangtan University, Xiangtan, Hunan, 411105, P. R. China
| | - Shuxin Wang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao, 266042, P. R. China
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13
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Cai W, Tan Y, He K, Tang B, Liu J. Manganese(II)-Guided Separation in the Sub-Nanometer Regime for Precise Identification of In Vivo Size Dependence. Angew Chem Int Ed Engl 2023; 62:e202214720. [PMID: 36652185 DOI: 10.1002/anie.202214720] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 12/26/2022] [Accepted: 01/18/2023] [Indexed: 01/19/2023]
Abstract
A precise understanding of nano-bio interactions in the sub-nanometer regime is necessary for advancements in nanomedicine. However, this is currently hindered by the control of the nanoparticle size in the sub-nanometer regime. Herein, we report a facile in situ Mn2+ -guided centrifugation strategy for the synthesis of large-scale ultrasmall gold nanoparticles (AuNPs) with a precisely controlled size gradient at the sub-nanometer regime. With the discovery that [Mn(OH)]+ , especially metallic manganese (Mn0 @[Mn(OH)]+ ) nanoparticles, could selectively interact with larger AuNPs through synergistic coordination and hydrogen bonding to form aggregates, we also realized the fast (<1 h) synthesis of water-soluble atomically precise Au25 with high yields (>56 %). We further demonstrated that sub-nanometer size differences (approximately 0.5 nm) significantly alter non-specific phagocytosis of AuNPs in the reticuloendothelial system macrophages, elimination rate, and nanotoxicology.
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Affiliation(s)
- Wei Cai
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Yue Tan
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Kui He
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Bing Tang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
| | - Jinbin Liu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, P. R. China
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14
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Skelly E, Rolband LA, Beasock D, Afonin KA. Synthesis of DNA-Templated Silver Nanoclusters and the Characterization of Their Optical Properties and Biological Activity. Methods Mol Biol 2023; 2709:299-307. [PMID: 37572290 PMCID: PMC10482316 DOI: 10.1007/978-1-0716-3417-2_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/14/2023]
Abstract
DNA-templated silver nanoclusters (DNA-AgNCs) are a unique class of bioinorganic nanomaterials. The optical properties and biological activities of DNA-AgNCs are readily modulated by the minor adjustments in the sequence or structure of the templating oligonucleotide. Excitation-emission matrix spectroscopy (EEMS) enables the fluorescence of compounds to be measured in a way that examines the entirety of a material's fluorescent properties. The use of EEMS for the characterization of DNA-AgNCs allows for multiple fluorescence peaks to be readily identified while providing the excitation and emission wavelengths of each signal. To assess the antibacterial and cytotoxic activities of DNA-AgNCs, two separate experimental approaches are used. Assessing the growth of bacteria over time is accomplished by measuring the optical density of the bacterial suspension with 600 nm light, which is directly related to the number of bacteria in suspension. In order to evaluate the DNA-AgNCs for cytotoxic activity, cell viability assays which probe mitochondrial activity were used. Herein, we describe protocols for the characterization of the fluorescent, antibacterial, and cytotoxic activities of DNA-AgNCs using EEM, optical density measurements, and cell viability assays.
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15
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Yan X, Qi Y, Ren L, Ma J, Xu M, Xia T, Liu S. Silver nanoclusters show advantages in macrophage tracing in vivo and modulation of anti-tumor immuno-microenvironment. J Control Release 2022; 348:470-82. [PMID: 35691499 DOI: 10.1016/j.jconrel.2022.06.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 05/31/2022] [Accepted: 06/05/2022] [Indexed: 12/16/2022]
Abstract
Macrophage-based nanomedicine represents an emerging powerful strategy for cancer therapy. Unfortunately, some obstacles and challenges limit the translational applications of macrophage-mediated nanodrug delivery system. For instance, tracking and effective cell delivery for targeted tumor sites remain to be overcome, and controlling the states of macrophages is still rather difficult due to their plastic nature in response to external stimuli. To address these critical issues, here, we reported a novel type of silver nanoclusters (AgNCs) with excellent fluorescent intensity, especially long-lasting cell labeling stability after endocytosis by macrophages, indicating promising applications in tracking macrophage-based nanomedicine delivery. Our mechanistic investigations uncovered that these merits originate from the escape of AgNCs from lysosomal degradation within macrophages. In addition, the AgNCs would prime the M1-like polarization of macrophages (at least in part) through the toll-like receptor 4 signaling pathway. The engineered macrophages laden with AgNCs could be employed for lung metastasis breast cancer treatment, showing the effective targeting propensity to metastatic tumors, remarkable regulation of tumor immune microenvironment and inhibition of tumor growth. Collectively, AgNC-trained macrophages appear to be a promising strategy for tumor immune-microenvironment regulation, which might be generalized to a wider spectrum of cancer therapeutics.
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Sathiyaseelan A, Saravanakumar K, Manivasagan P, Jeong MS, Jang ES, Wang MH. Folic acid conjugated chitosan encapsulated palladium nanoclusters for NIR triggered photothermal breast cancer treatment. Carbohydr Polym 2022; 280:119021. [PMID: 35027124 DOI: 10.1016/j.carbpol.2021.119021] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 11/26/2021] [Accepted: 12/13/2021] [Indexed: 12/13/2022]
Abstract
This study developed folic acid (FA) conjugated chitosan (CS) encapsulated rutin (R) synthesized palladium nanoclusters (Pd NCs) for NIR triggered and folate receptor (FR) targeted triple-negative breast cancer (MDA-MB 231 cells) treatment. R-Pd NCs exhibited flower-shaped particles with an average size of <100 nm. FA-CS encapsulation concealed the flower shape of R-Pd NCs with a positive charge. The XRD spectrum confirmed the cubic crystalline structure of Pd. The FA conjugation on CS improved the cellular uptake of R-Pd NCs in MDA-MB 231 cells was confirmed by TEM. FA-CS-R-Pd NCs (+NIR) treatment was considerably inhibited the MDA-MB 231 cells proliferation evidenced by cell viability, fluorescent staining, and flow cytometry analysis. Further, in vitro hemolysis assay and in Ovo model confirmed the non-toxic nature of FA-CS-R-Pd-NCs with or without NIR radiation. Hence, this study concluded that FA-CS-R-Pd NCs can be applied for the treatment of drug-resistant breast cancer.
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17
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Pavic K, Chippalkatti R, Abankwa D. Drug targeting opportunities en route to Ras nanoclusters. Adv Cancer Res 2022; 153:63-99. [PMID: 35101236 DOI: 10.1016/bs.acr.2021.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Disruption of the native membrane organization of Ras by the farnesyltransferase inhibitor tipifarnib in the late 1990s constituted the first indirect approach to drug target Ras. Since then, our understanding of how dynamically Ras shuttles between subcellular locations has changed significantly. Ras proteins have to arrive at the plasma membrane for efficient MAPK-signal propagation. On the plasma membrane Ras proteins are organized into isoform specific proteo-lipid assemblies called nanocluster. Recent evidence suggests that Ras nanocluster have a specific lipid composition, which supports the recruitment of effectors such as Raf. Conversely, effectors possess lipid-recognition motifs, which appear to serve as co-incidence detectors for the lipid domain of a given Ras isoform. Evidence suggests that dimeric Raf proteins then co-assemble dimeric Ras in an immobile complex, thus forming the minimal unit of an active nanocluster. Here we review established and novel trafficking chaperones and trafficking factors of Ras, along with the set of lipid and protein modulators of Ras nanoclustering. We highlight drug targeting approaches and opportunities against these determinants of functional Ras membrane organization. Finally, we reflect on implications for Ras signaling in polarized cells, such as epithelia, which are a common origin of tumorigenesis.
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Affiliation(s)
- Karolina Pavic
- Cancer Cell Biology and Drug Discovery Group, Department of Life Sciences and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Rohan Chippalkatti
- Cancer Cell Biology and Drug Discovery Group, Department of Life Sciences and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Daniel Abankwa
- Cancer Cell Biology and Drug Discovery Group, Department of Life Sciences and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg.
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18
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Li J, Wang Y, Xu C, Yu Q, Wang X, Xie H, Tian L, Qiu Y, Guo R, Lu Z, Li M, He Q. Rapid pH-responsive self-disintegrating nanoassemblies balance tumor accumulation and penetration for enhanced anti-breast cancer therapy. Acta Biomater 2021; 134:546-558. [PMID: 33882357 DOI: 10.1016/j.actbio.2021.04.022] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 04/06/2021] [Accepted: 04/12/2021] [Indexed: 01/08/2023]
Abstract
The dilemma of tumor accumulation and deep penetration has always been a barrier in antitumor therapy. Stimuli-responsive size changeable drug delivery systems provide possible solutions. Nevertheless, the low size-shrinkage efficiency limited the antitumor effects. In this study, an instant pH-responsive size shrinkable nanoassemblies named self-aggregated DOX@HA-CD (SA-DOX@HA-CD) was formulated using small-sized hyaluronic acid modified carbon dots (HA-CD) as monomers, which could self-aggregate into raspberry-like structure via hydrophobicity force in neutral pH and rapidly disassemble into shotgun-like DOX-loaded CD monomer in simulated tumor microenvironment (pH 6.5), owing to the transformation in electrical charge and hydrophobicity/hydrophilicity of this system. The transmission electron microscopy showed that the clustered SA-DOX@HA-CD had a diameter of ~150 nm, and thoroughly disassembled into ~30 nm nanoparticles in response to acidic environment. The disassemble efficiency was approximately 100%. Attributed to this property, SA-DOX@HA-CD led to enhanced cellular internalization and accumulation in 4T1 cells in simulated tumor microenvironment, as well as deep tumor penetration in 3D tumor spheroid model. Besides, the imine bond between DOX and HA-CD endowed DOX with pH-responsive release profile in the acidic lysosome environment. Furthermore, in the orthotopic 4T1 tumor-bearing mouse model, SA-DOX@HA-CD demonstrated higher tumor accumulation than non-aggregated DOX-HA-CD. Meanwhile, in response to the acid tumor microenvironment, the dissociated DOX-HA achieved deep tumor penetration, which consequently resulted in 2.5-fold higher antitumor efficiency. The formulation of self-aggregated SA-DOX@HA-CD provides a simple and effective alternative to prepare pH-responsive size-shrinkable nanodrug delivery systems. STATEMENT OF SIGNIFICANCE: The heterogeneity of tumor vasculature and the high tumor interstitial pressure lead to the barriers in tumor accumulation and deep penetration, which calls for opposite properties (e.g. size) of drug delivery systems. To address this dilemma, various size changeable nanoparticles have been developed utilizing special features of tumor microenvironment, such as pH, enzyme and reactive oxygen species. Nevertheless, the current strategies face the problems of incomplete hydrolysis of chemical bonds or insufficient enzyme degradation, which result in only partial size shrinkage, hindering the tumor deep penetration effects. Here we developed a self-assembled nanocluster, which could respond to acidic pH rapidly and thoroughly disassemble into small nanodots due to the alteration of hydrophobicity/hydrophilicity/charge, leading to approximately 100% dissociation. This strategy provides a new concept for design of size changeable drug delivery systems.
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Affiliation(s)
- Jianping Li
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Yashi Wang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Chaoqun Xu
- Sichuan Academy of Chinese Medicine Science, Chengdu, 610041, People's Republic of China
| | - Qianwen Yu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Xuhui Wang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Hanbing Xie
- Department of Obstetrics and Gynecology, West China Second University Hospital of Sichuan University and the Key Laboratory of Birth Defects and Related Diseases of Women and Children, Sichuan University, Ministry of Education, Chengdu, 610064, People's Republic of China
| | - Lifeng Tian
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Yue Qiu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Rong Guo
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Zhengze Lu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China
| | - Man Li
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China.
| | - Qin He
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry and Sichuan Province, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, People's Republic of China.
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Ahmadi A, Khoshfetrat SM, Kabiri S, Dorraji PS, Larijani B, Omidfar K. Electrochemiluminescence paper-based screen-printed electrode for HbA1c detection using two-dimensional zirconium metal-organic framework/Fe 3O 4 nanosheet composites decorated with Au nanoclusters. Mikrochim Acta 2021; 188:296. [PMID: 34401972 DOI: 10.1007/s00604-021-04959-y] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 07/26/2021] [Indexed: 12/17/2022]
Abstract
Glycated hemoglobin (HbA1c) is one of the most popular biomarkers which can be utilized for the diagnosis and control of diabetes in clinical practice. In this study, a sandwich paper-based electrochemiluminescence (ECL) biosensor has been developed using the zirconium metal-organic framework/Fe3O4(trimethyl chitosan)/gold nanocluster (Zr-MOF/Fe3O4(TMC)/AuNCs) nanocomposite as tracing tag to label anti-HbA1c monoclonal antibody and reduced graphene oxide (rGO) as immobilization platform of sensing element. The screen-printed electrodes (SPEs) were constructed and modified by sputtering a thick layer of gold on the paper substrate, followed by electrochemical reduction of aminophenylboronic acid (APBA)-functionalized GO to rGO/APBA, respectively. Different types of surface analysis methods were applied to characterize the Zr-MOF/Fe3O4(TMC)/AuNCs nanomaterials fabricated. Finally, antibody-labeled Zr-MOF/Fe3O4(TMC)/AuNCs nanocomposites were subjected to HbA1c in the sample and on the paper-based SPE. Quantitative measurement of HbA1c was performed using ECL and cyclic voltammetry (CV) over a potential range of - 0.2 to 1.7 V vs gold reference electrode with a sweep rate of 0.2 V.s-1 in the presence of triethylamine as a co-reactant after sandwiching the HbA1c target between antibody and APBA on the sensing area. This immunosensor demonstrated the desirable assay performance for HbA1c with a wide response range from 2 to 18% and a low detection limit (0.072%). This new strategy provides an effective method for high-performance bioanalysis and opens avenues for the development of high-sensitive and user-friendly device. Graphical abstract.
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Affiliation(s)
- Anita Ahmadi
- Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.,Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | | | - Shima Kabiri
- Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran.,Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Parisa Seyed Dorraji
- Department of Chemistry, Faculty of Physics and Chemistry, Alzahra University, Tehran, Iran
| | - Bagher Larijani
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Kobra Omidfar
- Biosensor Research Center, Endocrinology and Metabolism Molecular-Cellular Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran. .,Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
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20
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Sultan D, Li W, Detering L, Heo GS, Luehmann HP, Kreisel D, Liu Y. Assessment of ultrasmall nanocluster for early and accurate detection of atherosclerosis using positron emission tomography/computed tomography. Nanomedicine 2021; 36:102416. [PMID: 34147662 DOI: 10.1016/j.nano.2021.102416] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/17/2021] [Accepted: 04/30/2021] [Indexed: 11/25/2022]
Abstract
The development of atherosclerosis therapy is hampered by the lack of molecular imaging tools to identify the relevant biomarkers and determine the dynamic variation in vivo. Here, we show that a chemokine receptor 2 (CCR2) targeted gold nanocluster conjugated with extracellular loop 1 inverso peptide (AuNC-ECL1i) determines the initiation, progression and regression of atherosclerosis in apolipoprotein E knock-out (ApoE-/-) mouse models. The CCR2 targeted 64Cu-AuNC-ECL1i reveals sensitive detection of early atherosclerotic lesions and progression of plaques in ApoE-/- mice. CCR2 targeting specificity was confirmed by the competitive receptor blocking studies. In a mouse model of aortic arch transplantation, 64Cu-AuNC-ECL1i accurately detects the regression of plaques. Human atherosclerotic tissues show high expression of CCR2 related to the status of the disease. This study confirms CCR2 as a useful marker for atherosclerosis and points to the potential of 64Cu-AuNC-ECL1i as a targeted molecular imaging probe for future clinical translation.
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Affiliation(s)
- Deborah Sultan
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO, USA
| | - Wenjun Li
- Department of Surgery, Washington University School of Medicine, St. Louis, MO, USA
| | - Lisa Detering
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO, USA
| | - Gyu Seong Heo
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO, USA
| | - Hannah P Luehmann
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO, USA
| | - Daniel Kreisel
- Department of Surgery, Washington University School of Medicine, St. Louis, MO, USA; Department of Pathology and Immunology, Washington University, St. Louis, MO, USA.
| | - Yongjian Liu
- Mallinckrodt Institute of Radiology, Washington University, St. Louis, MO, USA.
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21
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Abstract
On the plasma membrane, Ras is organized into laterally segregated proteo-lipid complexes called nanoclusters. The extent of Ras nanoclustering correlates with its signaling output, positioning nanocluster as dynamic signaling gain modulators. Recent evidence suggests that stacked dimers of Ras and Raf are elemental units at least of one type of Ras nanocluster. However, it is still incompletely understood, in which physiological contexts nanoclustering is regulated and which constituents are parts of nanocluster. Nonetheless, disruption of nanoclustering faithfully diminishes Ras activity in cells, suggesting Ras nanocluster as potential drug targets.While there are several methods available to study Ras nanocluster , fluorescence or Förster resonance energy transfer (FRET ) between fluorescently labeled, nanoclustered Ras proteins is a relatively simple readout. FRET measurements using fluorescence lifetime imaging microscopy (FLIM ) have proven to be robust and sensitive to determine Ras nanoclustering changes. Loss of FRET that emerges due to nanoclustering reports on all processes upstream of Ras nanoclustering, i.e., also on proper trafficking or lipid modification of Ras. Here we report our standard FLIM-FRET protocol to measure nanoclustering-dependent FRET of Ras in mammalian cells. Importantly, nanoclustering-dependent FRET is one of the few methods that can detect differences between the Ras isoforms.
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Affiliation(s)
- Hanna Parkkola
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, Finland
| | - Farid Ahmad Siddiqui
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, Finland
| | | | - Daniel Abankwa
- Turku Bioscience Centre, University of Turku and Åbo Akademi University, Turku, Finland.
- Cancer Cell Biology and Drug Discovery Group, Department of Life Sciences and Medicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg.
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Bhattacharyya U, Pooventhiran T, Thomas R. Adsorption of the drug bempedoic acid over different 2D/3D nanosurfaces and enhancement of Raman activity enabling ultrasensitive detection: First principle analysis. Spectrochim Acta A Mol Biomol Spectrosc 2021; 254:119630. [PMID: 33684853 DOI: 10.1016/j.saa.2021.119630] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 01/30/2021] [Accepted: 02/14/2021] [Indexed: 06/12/2023]
Abstract
The nanocluster-based drug delivery system is of much importance, now days. This manuscript studies the interaction of pristine/substituted/doped GQDs, fullerene, helicene and CNT with bempedoic acid, which is an effective alternative of statins in the treatment of hypercholesteremia. The adsorption energies are calculated at B3LYP-D3/6-311G+(2d,p) level in order to study the adsorption of bempedoic acid over the surfaces of the nanoclusters incorporating Grimme's dispersion correction. Surface enhanced Raman scattering (SERS), which is a sound approach to vibrational spectroscopy, is used in order to detect bempedoic acid. All the studies signify that bempedoic acid can be detected with these nanoclusters and the negative adsorption energies advocate for the possible use of these nanoclusters as effective drug delivery system in case of bempedoic acid. Adsorption energy of bempedoic acid over helicene was found to be the most negative among the mentioned nanocluster systems, while adsorption on the surface of CNT was found to be the least negative.
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Affiliation(s)
- Utsab Bhattacharyya
- Department of Chemistry, St Berchmans College (Autonomous), Mahatma Gandhi University, Changanassery, Kerala 686101, India
| | - T Pooventhiran
- Department of Chemistry, St Berchmans College (Autonomous), Mahatma Gandhi University, Changanassery, Kerala 686101, India
| | - Renjith Thomas
- Department of Chemistry, St Berchmans College (Autonomous), Mahatma Gandhi University, Changanassery, Kerala 686101, India.
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Bejjanki NK, Zhong Y, Liu J, Li Q, Xu H, Shen H, Xie M. Surface charge transition nano-theranostics based on ultra-small Fe 3O 4 nanoparticles for enhanced photodynamic and photothermal therapy against nasopharyngeal carcinoma. Biochem Biophys Res Commun 2021; 557:240-246. [PMID: 33894409 DOI: 10.1016/j.bbrc.2021.03.168] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/22/2021] [Accepted: 03/30/2021] [Indexed: 01/13/2023]
Abstract
Platinum-based concurrent chemo-radiotherapy is the most common strategy for the treatment of Nasopharyngeal carcinoma. However, low efficacy and side effects are the two major problems associated with this approach. Therefore, it is urgent need to explore novel therapeutic modalities to meet clinically standards. Photothermal therapy (PTT) and photodynamic therapy (PDT) are non-invasive and light trigger modalities received great attention to overcome the limitations and significantly improved cancer therapy. Here, we developed acidity surface charge transformable nanocluster (NCs) composed of Indocyanine green (ICG), Fe3O4, and Palmitoyl ascorbic acid (PA) with pH-responsive PEG-b-PAEMA-PDMA for enhanced synergistic PDT/PTT. NCs has the neutral hydrophilic surface helps to prolong blood circulation and instantly transformed to positively charged surface at tumoral acidic pH (6.5), which promoted the cellular uptake. Under laser irradiation (808 nm, 1 W/cm2), NCs produced PTT effect, concurrently it converts singlet oxygen (1O2) into H2O2, which can be further involved in Fenton reaction and produce toxic hydroxyl radical (•OH) enhances therapy efficacy. In vitro experiments on HNE-1 cancer cells showed improved intracellular uptake of NCs at low pH and simultaneously induced higher cytotoxicity medicated by synergetic PDT/PTT effect. In vivo therapeutic study revealed that NCs treatment under laser irradiation showed superior inhibition of tumor growth in HNE-1 tumor bearing mice model. Taken together, the present findings suggest that NCs could be used as "all in one" nano theranostic agent for enhanced PDT/PTT of cancer therapy.
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Affiliation(s)
- Naveen Kumar Bejjanki
- Institute for Solar Energy Systems, C501, School of Engineering, Sun Yat-sen University, Higher Education Mega Center, Panyu District, Guangzhou 510006, China; Department of Otolaryngology Head and Neck Surgery, Zhuhai People's Hospital, Zhuhai, 519000, Guangdong, China
| | - Ying Zhong
- Department of Otolaryngology Head and Neck Surgery, Zhuhai People's Hospital, Zhuhai, 519000, Guangdong, China; Department of Otolaryngology-Head and Neck Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China
| | - Jie Liu
- Department of Otolaryngology Head and Neck Surgery, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, 510655, China
| | - Quanming Li
- Department of Otolaryngology Head and Neck Surgery, Zhuhai People's Hospital, Zhuhai, 519000, Guangdong, China
| | - Hongfa Xu
- Zhuhai Precision Medical Center, Zhuhai People's Hospital, Zhuhai, 519000, Guangdong, China
| | - Hui Shen
- Institute for Solar Energy Systems, C501, School of Engineering, Sun Yat-sen University, Higher Education Mega Center, Panyu District, Guangzhou 510006, China.
| | - Minqiang Xie
- Department of Otolaryngology Head and Neck Surgery, Zhuhai People's Hospital, Zhuhai, 519000, Guangdong, China; Department of Otolaryngology-Head and Neck Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, 510282, Guangdong, China.
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Demissie H, An G, Jiao R, Ma G, Liu L, Sun H, Wang D. Removal of phenolic contaminants from water by in situ coated surfactant on Keggin-aluminum nanocluster and biodegradation. Chemosphere 2021; 269:128692. [PMID: 33228982 DOI: 10.1016/j.chemosphere.2020.128692] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 10/15/2020] [Accepted: 10/18/2020] [Indexed: 06/11/2023]
Abstract
Recent water treatment plants require multi-process techniques to remove contaminants from aqua media. In this study, we investigate the novel, in situ coated sodium dodecylsulphate (SDS), on kegging Al30 nanocluster as a single water treatment alternative for the removal of phenolic contaminants and suspension. FTIR, TEM-EDX and Zeta potential analysis characterized the nanocluster decoration. The resulting property was examined by emission (λ-max) of the molecular probe, the online aggregate image of fluorescence microscopy, and mixing isochrone, fat-soluble dye solubilization. The coated media was examined as nearly resembling the hydrophobicity of 1-octanol. The elemental line scanning and mapping showed different morphologies of floc depending on the SDS concentration. The material was found to follow Brownian motion to enmesh suspended particles like a ladder, and served as entrapper for small organic contaminants by the sorbed SDS aggregate, based on their log KO/W. About 85% and ≥95% removal archived for contaminants with the least and highest KO/W value, respectively. The residual solutes in the supernatant were well decomposed by using a bacterial agent. One-step removal (less footprint) and ease of operation make this approach an environmentally compatible and cost-effective alternative for the large-scale treatment process.
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Affiliation(s)
- Hailu Demissie
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; Key Laboratory of drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Science, Beijing, 100049, China; Department of Chemistry, Arba Minch University, 1000, Ethiopia
| | - Guangyu An
- Key Laboratory of drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Science, Beijing, 100049, China
| | - Ruyuan Jiao
- Key Laboratory of drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Science, Beijing, 100049, China
| | - Gefei Ma
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; Key Laboratory of drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Science, Beijing, 100049, China
| | - Libing Liu
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; Key Laboratory of drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Science, Beijing, 100049, China
| | - Hongyan Sun
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; Key Laboratory of drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Science, Beijing, 100049, China
| | - Dongsheng Wang
- Key Laboratory of drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Science, Beijing, 100049, China.
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Li W, Yu X, Huang H. Nanocluster-assisted protein-film voltammetry for direct electrochemical signal acquisition. Anal Bioanal Chem 2021; 413:1665-73. [PMID: 33501552 DOI: 10.1007/s00216-020-03130-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 12/01/2020] [Accepted: 12/15/2020] [Indexed: 12/23/2022]
Abstract
Acquisition of the direct electrochemical response of protein is the cornerstone for the development of the third generation of electrochemical biosensors. In this work, we developed a nanocluster-assisted protein-film voltammetry technique (NCA-PFV) which can achieve the acquisition of the electrochemical signal and maintain the activity without affecting of the protein's structure. With this strategy, a lipid bilayer membrane is used to immobilize the membrane protein so as to maintain its natural state. Copper nanoclusters with a size smaller than most proteins are then used to function at sub-protein scale and to mediate the electron hopping from the electroactive center of the electrode. As a model, the direct electrochemical signal of cyclooxygenase (COX) is successfully obtained, with a pair of well-defined redox peaks located at -0.39 mV and -0.31 mV, which characterize the heme center of the enzyme. Its catalytic activity towards the substrate arachidonic acid (AA) is also retained. The detection range for AA is 10-1000 μM and the detection limit is 2.4 μM. Electrochemical monitoring of the regulation of the catalytic activity by an inhibitor DuP-697 is also achieved. This work provides a powerful tool for the fabrication of enzyme-based electrochemical biosensors, and is also of great significance for promoting the development and application of next-generation electrochemical biosensors.
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26
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Fereja SL, Fang Z, Li P, Guo J, Fereja TH, Chen W. "Turn-off" sensing probe based on fluorescent gold nanoclusters for the sensitive detection of hemin. Anal Bioanal Chem 2021; 413:1639-49. [PMID: 33483839 DOI: 10.1007/s00216-020-03126-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 12/09/2020] [Accepted: 12/14/2020] [Indexed: 01/18/2023]
Abstract
Balanced level of hemin in the body is fundamentally important for normal human organ function. Therefore, environmentally benign, stable, and fluorescent metal nanoclusters (NCs) for selective and sensitive detection of hemin have been investigated and reported. Herein, highly orange red emissive gold NCs are successfully synthesized using glutathione as a reducing and stabilizing agent (GSH-Au NCs). The clusters are characterized using various techniques like Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), UV-vis spectroscopy, and fluorescence spectrometer. The fluorescence intensity of as-synthesized Au NCs strongly quenched upon addition of different concentrations of hemin. The decrease in fluorescence intensity of GSH-Au NCs has been applied for determination of hemin concentration in the linear range from 1 to 25 nM with a low limit of detection (LOD) of 0.43 nM. The method was also successfully applied for quantification of hemin in human serum sample. In view of this reality, the system can be considered as a possible strategy and excellent platform for determination of hemin in various areas of application.
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27
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Ilgaz Aysan I, Gorkan T, Ozdemir I, Kadioglu Y, Gökoğlu G, Aktürk E. Electronic structure, cohesive and magnetic properties of iridium oxide clusters adsorbed on graphene. J Mol Graph Model 2020; 101:107726. [PMID: 32920238 DOI: 10.1016/j.jmgm.2020.107726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 07/30/2020] [Accepted: 08/24/2020] [Indexed: 10/23/2022]
Abstract
In this study, we investigated and revealed the electronic properties, geometric structures and binding behavior of small (IrO)n and [Formula: see text] (n = 1-5) clusters within first principles calculations based on the density functional theory. The electronic and magnetic properties of small nanoclusters displayed significant size dependency due to strong quantum confinement effect. Moreover we considered the binding and structural modification of the clusters on graphene surface as a substrate. The cohesive energy per atom of isolated clusters increased with size of the cluster n. This shows that the increase in coordination number results in a more stable nanocluster with increased number of saturated bonds. Pristine (IrO)n and [Formula: see text] clusters presented different structural motives at equilibrium. The ground states of (IrO)n and [Formula: see text] clusters considered in this study were all magnetic except for (IrO)4, [Formula: see text] , and [Formula: see text] . HOMO-LUMO gap EHLG values displayed large variations due to size of the cluster, hence bond saturation. The structural configurations of free standing nanoclusters are slightly modified, when adsorbed on graphene. The adsorption behavior of a cluster on graphene was improved by an applied electric field yielding larger binding energy and larger charger transfer. We observed that electronic and magnetic ground state of the clusters strongly depend on optimized structural configuration for both bare and adsorbed on graphene monolayer.
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Affiliation(s)
- Isil Ilgaz Aysan
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Taylan Gorkan
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Ilkay Ozdemir
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Yelda Kadioglu
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey
| | - Gökhan Gökoğlu
- Department of Mechatronics Engineering, Faculty of Engineering, Karabuk University, 78050, Karabuk, Turkey
| | - Ethem Aktürk
- Department of Physics, Adnan Menderes University, 09100, Aydin, Turkey; Nanotechnology Application and Research Center, Adnan Menderes University, 09100, Aydin, Turkey.
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28
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Chien HJ, Lai SM, Wang WC, Lin HY, Juang YM, Lai PS, Lai CC. Preparation and comparison of Fe 3O 4@graphene oxide nanoclusters for analysis of glimepiride in urine by surface-assisted laser desorption/ionization time-of-flight mass spectrometry. Anal Bioanal Chem 2020; 412:4057-65. [PMID: 32248396 DOI: 10.1007/s00216-020-02611-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 03/11/2020] [Accepted: 03/20/2020] [Indexed: 12/16/2022]
Abstract
Graphene oxide (GO) has the ability to absorb certain compounds, and it can be modified with functional groups for different purposes; for instance, iron oxide (IO) nanoparticles can be used to concentrate analyte by a magnet. Recently, many kinds of GO have been developed, such as single-layer GO (SLGO), two-to-four layers of GO (i.e., few-layer GO, FLGO2-4), and four-to-eight layers of GO (i.e., multi-layer GO, MLGO4-8). However, the abilities of these layered GO coated with IO nanoparticles have not been investigated. In this study, we conducted a novel analysis of glimepiride by using layered GO-coated magnetic clusters of IO nanoparticles that were synthesized through a simple and facile emulsion-solvent evaporation method. The methodology is based on (i) enrichment of glimepiride using the layered GO-coated magnetic clusters of IO nanoparticles (IO@SLGO, IO@FLGO2-4, and IO@MLGO4-8), and (ii) rapid determination using magnetic cluster-based surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOFMS). We found that IO@MLGO4-8, the magnetic cluster with the greatest number of GO layers, had the best limit of detection (28.6 pmol/μL for glimepiride). The number of GO layers played a significant role in increasing the sensitivity of the SALDI-MS, indicating that the size of GO in the magnetic clusters contributed to the desorption/ionization efficiency. To the best of our knowledge, this is the first study to enrich glimepiride using magnetic clusters of different GO types and to show that the glimepiride in HLB purified urine adsorbed by magnetic clusters can be analyzed by SALDI-TOFMS.
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Raju S, Manalel Joseph M, Kuttanpillai RP, Padinjarathil H, Gopalakrishnan Nair Usha P, Therakathinal Thankappan Nair S. Polysaccharide enabled biogenic fabrication of pH sensing fluorescent gold nanoclusters as a biocompatible tumor imaging probe. Mikrochim Acta 2020; 187:246. [PMID: 32215724 DOI: 10.1007/s00604-020-4189-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Accepted: 02/24/2020] [Indexed: 12/21/2022]
Abstract
A biocompatible natural polysaccharide (PSP001) isolated from the fruit rind of Punica granatum was conjugated with L-cysteine (Y) to be used as a skeleton for the fabrication of fluorescent gold nanoclusters (AuNCs) represented as PSP-Y-AuNCs. With an average size of ~ 6 nm, PSP-Y-AuNCs demonstrated high quantum yield (31%), with a pH-sensitive fluorescence emission behavior. An emission maximum of 520 nm was obtained at acidic pH, which was blue shifted with increasing pH. This feature provides the possibilities for accurate ratiometric pH imaging. The PSP-Y-AuNCs not only demonstrated excellent biocompatibility with cancer cells and isolated peripheral lymphocytes and red blood cells but also demonstrated to be an active molecular imaging probe with appealing cellular uptake efficiency. The investigations with BALB/c mice further confirmed the non-toxic nature and in vivo imaging potential of the AuNCs. Estimation of the bio-distribution on solid tumor bearing syngeneic murine models revealed a tumor-targeted enhanced fluorescence emission pattern which is attributed to the pH responsive fluorescence behavior and the acidic microenvironment of the tumor. These findings were further confirmed with an impressive tumor accumulation pattern displayed in a xenograft of human cancer bearing nude mice. On account of their impressive biocompatibility and photophysical features, PSP-Y-AuNCs can exploited for the real-time fluorescence imaging of cancer tissues. Graphical abstract Fluorescent gold nanoclusters (PSP-Y-AuNCs) fabricated using a non-toxic natural polysaccharide (PSP001) demonstrated pH sensitive fluorescence emission pattern. The increased fluorescence readouts at acidic conditions and excellent biocompatibility made the PSP-Y-AuNCs an appealing candidate for in vivo tumor imaging applications.
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30
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Liu J, Li S, Fang Y, Zhu Z. Boosting antibacterial activity with mesoporous silica nanoparticles supported silver nanoclusters. J Colloid Interface Sci 2019; 555:470-479. [PMID: 31400539 DOI: 10.1016/j.jcis.2019.08.009] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 07/21/2019] [Accepted: 08/02/2019] [Indexed: 12/11/2022]
Abstract
Ultrasmall silver nanoclusters (Ag NCs) are one of the emerging and highly efficient antibacterial agents, owing to the unique features of sub-2 nm particle size and the high abundance of the active Ag+ species. However, practical applications of Ag NCs in biological environment are often hampered by silver oxidization, which results in particle aggregation and loss of antibacterial activity. In this study, for the first time, we develop a facile method to synthesize highly dispersed Ag NCs decorated mesoporous silica nanoparticles (Ag NC-MSNs) capable of long-term and efficient release of Ag+ ions. This novel Ag NC-MSNs nanocomposite was demonstrated as an effective antibacterial agent against both Gram-positive and Gram-negative pathogenic bacteria. Compared with the counterparts Ag NCs and silver nanoparticles decorated mesoporous silica nanoparticles (Ag NP-MSNs), Ag NC-MSNs exhibit 17-fold and 27-fold enhancement in antibacterial potency, respectively. The homogeneous distribution of ultrasmall Ag NCs in the mesoporous architecture of supporting MSNs matrix is crucial for the controlled release of Ag+ ions, leading to the superior broad-spectrum antimicrobial activity. Moreover, the cytotoxicity assay indicated that the effective antibacterial concentration of Ag NC-MSNs shows minimum toxicity on mammalian cells. This new Ag nanocomposite developed in this work is promising for practical applications against various microbial infections.
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Affiliation(s)
- Jing Liu
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Siheng Li
- Department of Chemistry, University of Houston, Houston, TX 77204, USA
| | - Yushuang Fang
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Zhiling Zhu
- College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
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Chen JH, Blanpied TA, Tang AH. Quantification of trans-synaptic protein alignment: A data analysis case for single-molecule localization microscopy. Methods 2019; 174:72-80. [PMID: 31325491 DOI: 10.1016/j.ymeth.2019.07.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 06/14/2019] [Accepted: 07/16/2019] [Indexed: 12/13/2022] Open
Abstract
Nanoscale distribution of proteins and their relative positioning within a defined subcellular region are key to their physiological functions. Thanks to the super-resolution imaging methods, especially single-molecule localization microscopy (SMLM), mapping the three-dimensional distribution of multiple proteins has been easier and more efficient than ever. Nevertheless, in spite of the many tools available for efficient localization detection and image rendering, it has been a challenge to quantitatively analyze the 3D distribution and relative positioning of proteins in these SMLM data. Here, using heterogeneously distributed synaptic proteins as examples, we describe in detail a series of analytical methods including detection of nanoscale density clusters, quantification of the trans-synaptic alignment between these protein densities, and automatic en face projection and averaging. These analyses were performed within customized Matlab routines and we make the full scripts available. The concepts behind these analytical methods and the scripts can be adapted for quantitative analysis of spatial organization of other macromolecular complexes.
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Affiliation(s)
- Jia-Hui Chen
- CAS Key Laboratory of Brain Function and Disease and Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Thomas A Blanpied
- Program in Neuroscience and Department of Physiology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Ai-Hui Tang
- CAS Key Laboratory of Brain Function and Disease and Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China.
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32
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Wang G, Feng L, Li W, Zhang J, Fu Y. In-situ generation of nanozymes by natural nucleotides: a biocatalytic label for quantitative determination of hydrogen peroxide and glucose. Mikrochim Acta 2019; 186:514. [PMID: 31280406 DOI: 10.1007/s00604-019-3616-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Accepted: 06/14/2019] [Indexed: 12/16/2022]
Abstract
Four natural nucleotides including 5'-cytidine monophosphate (CMP), 5'-thymidine monophosphate (TMP), guanosine monophosphate (GMP) and 5'-adenosine monophosphate (AMP) were employed to modulate the coordination environment and the valence state of PtCl42-. This is the first report that natural nucleotides have the ability to produce highly active Pt nanoclusters. The latter are shown to act as peroxidase mimetics. Both the size distribution and the charge state of Pt-nucleotide nanozymes vary with the chemical structures of nucleotides, thereby contributing to distinct enzyme-like activities. By adopting Pt-CMP as a signal amplifier, a photometric assay was well-established for quantitative determination of glucose. The assay is based on the oxidation of glucose by glucose oxidase. The oxidation product (H2O2) is detected at 652 nm via the Pt-CMP-catalyzed oxidation of 3,3',5,5'-tetramethylbenzidine with H2O2. Response is linear in the 5 to 100 μM glucose concentration range, and the limit of detection is 0.12 μM (at S/N= 3). The method excels by a low signal background, high sensitivity, and low consumption of energy and materials. Graphical abstract Peroxidase mimicking Pt nanoclusters were synthesized by employing natural nucleotides as both the reducing agent and the stabilization template.
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Sharma A, Yadav A, Gupta N, Sharma S, Kakkar R, Cwiklinski K, Quaye E, Mahajan SD, Schwartz SA, Kumar Sharma R. Multifunctional mesoporous curcumin encapsulated iron-phenanthroline nanocluster: A new Anti-HIV agent. Colloids Surf B Biointerfaces 2019; 180:289-297. [PMID: 31071568 DOI: 10.1016/j.colsurfb.2019.04.057] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 04/02/2019] [Accepted: 04/27/2019] [Indexed: 01/16/2023]
Abstract
A new strategy to encapsulating the drug curcumin into the hydrophobic core of the iron-phenanthroline nanocomplex (NIP) and eventually its release is signified. NIP was prepared via coordinate interaction between Fe2+ and the lone pairs present on the N atoms of the bidentate phenanthroline ligand (spherical morphology, diameter 18.8 nm, mesoporous with pore size 2.443 nm, amorphous). Thereafter, curcumin was successfully encapsulated (NCIP) in NIP, resulting in its enhanced stability (spherical morphology, diameter 46.8 nm). The nanocomplex NIP was used for drug delivery applications. We evaluated the anti-HIV effects of NCIP in vitro on cultures of HIV infected human microglia. The treatment of HIV-1 infected microglia with NCIP significantly decreased the expression of HIV-p24 by 41% and pro-inflammatory mediators TNF-α, IL-8 and NO by 61.2%, 41% and 50.2%, respectively, compared to NIP. Flow cytometry data also support the decrease in TNF-α and IL-8 expression in case of NCIP. NCIP induced antioxidative effects by increasing the gene expression of catalase (CAT) and simulatenously decreasing hemeoxygenase-1 (HMOX-1) gene expression, thereby maintaining homeostasis which reduces neuroinflammation. These results support our premise that NCIP may be a significant adjuvant when used with traditional anti-retroviral regimens and may ameliorate HIV-1 associated neurotoxicity.
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Affiliation(s)
- Anu Sharma
- Department of Chemistry, Nanotechnology and Drug Delivery Research Lab, University of Delhi, India
| | - Anita Yadav
- Department of Chemistry, Nanotechnology and Drug Delivery Research Lab, University of Delhi, India
| | - Nikesh Gupta
- Department of Chemistry, Nanotechnology and Drug Delivery Research Lab, University of Delhi, India
| | - Sandeep Sharma
- Department of Chemistry, Nanotechnology and Drug Delivery Research Lab, University of Delhi, India
| | - Rita Kakkar
- Department of Chemistry, Computational chemistry Lab, University of Delhi, India
| | - Katherine Cwiklinski
- Department of Medicine, Division of Allergy, Immunology and Rheumatology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Elizabeth Quaye
- Department of Medicine, Division of Allergy, Immunology and Rheumatology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA
| | - Supriya D Mahajan
- Department of Medicine, Division of Allergy, Immunology and Rheumatology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA.
| | - Stanley A Schwartz
- Department of Medicine, Division of Allergy, Immunology and Rheumatology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA.
| | - Rakesh Kumar Sharma
- Department of Chemistry, Nanotechnology and Drug Delivery Research Lab, University of Delhi, India.
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Zhuang Z, Chen W. Ultra-low loading of Pd 5 nanoclusters on carbon nanotubes as bifunctional electrocatalysts for the oxygen reduction reaction and the ethanol oxidation reaction. J Colloid Interface Sci 2019; 538:699-708. [PMID: 30545584 DOI: 10.1016/j.jcis.2018.12.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 11/29/2018] [Accepted: 12/03/2018] [Indexed: 11/20/2022]
Abstract
How to reduce the usage of precious metals in electrocatalysts is a big challenge for the development of fuel cells. Metal nanoclusters (NCs) are highly desirable as active catalysts, but palladium nanoclusters (Pd NCs) have been less well developed than other metal clusters, such as gold, silver and copper, owing partly to the difficulties in size-controlled synthesis. Here, based on N, N-dimethylformamide (DMF)-mediation and ligand-exchange reaction, atomically precise Pd5(C12H25S)13 nanoclusters are successfully synthesized. By loading the as-prepared Pd5 nanoclusters on multiwalled carbon nanotubes (MWCNTs) and the following pyrolysis to remove the thiolate ligands, the surface-cleaned Pd5 clusters (Pd5 NCs/MWCNTs) can serve as efficient electrocatalysts for the oxygen reduction reaction (ORR) and the ethanol oxidation reaction (EOR). With ultra-low mass loading of Pd (2%), the Pd5 NCs showed higher mass and specific activities and better durability than the commercial Pd/C catalyst (5 wt%) for the ORR. At 0.8 V, the mass and specific activities of Pd5 NCs/MWCNTs are 5.70 and 4.53 times higher than the commercial Pd/C catalyst, respectively. As for the EOR, the Pd5 NCs/MWCNTs exhibited lower onset potential (0.39 V) and peak potential (0.81 V) than the commercial Pd/C catalyst (0.44 and 0.89 V). Electrochemical impedance spectroscopy (EIS) measurements indicated that for the EOR, the Pd5 nanoclusters have a much smaller charge transfer resistance (Rct) than the commercial Pd/C. The high-performance electrocatalytic properties of Pd5 NCs for the ORR and EOR could be ascribed to the relatively high surface area-to-volume ratio and high density of exposed surface atoms of the Pd5 nanoclusters.
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Bondarenko NV, Nedolya AV. Energy of the Isolated Metastable Iron-Nickel FCC Nanocluster with a Carbon Atom in the Tetragonal Interstice. Nanoscale Res Lett 2017; 12:139. [PMID: 28235374 PMCID: PMC5319937 DOI: 10.1186/s11671-017-1919-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 02/13/2017] [Indexed: 06/06/2023]
Abstract
The energy of the isolated iron-nickel nanocluster was calculated by molecular mechanics method using Lennard-Jones potential. The cluster included a carbon atom that drifted from an inside octahedral interstice to a tetrahedral interstice in [Formula: see text] direction and after that in <222> direction to the surface. In addition, one of 14 iron atoms was replaced by a nickel atom, the position of which was changing during simulation.The energy of the nanocluster was estimated at the different interatomic distances. As a result of simulation, the optimal interatomic distances of Fe-Ni-C nanocluster was chosen for the simulation, in which height of the potential barrier was maximal and face-centered cubic (FCC) nanocluster was the most stable.It is shown that there were three main positions of a nickel atom that significantly affected nanocluster's energy.The calculation results indicated that position of the carbon atom in the octahedral interstice was more energetically favorable than tetrahedral interstice in the case of FCC nanocluster. On the other side, the potential barrier was smaller in the direction [Formula: see text] than in the direction <022>.This indicates that there are two ways for carbon atom to drift to the surface of the nanocluster.
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Affiliation(s)
- Natalya V. Bondarenko
- Applied Physics Department, Zaporizhzhya National University, 66 Zhukovsky St., 69600 Zaporizhzhya, Ukraine
| | - Anatoliy V. Nedolya
- Applied Physics Department, Zaporizhzhya National University, 66 Zhukovsky St., 69600 Zaporizhzhya, Ukraine
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Hyla M. Network-Forming Nanoclusters in Binary As-S/Se Glasses: From Ab Initio Quantum Chemical Modeling to Experimental Evidences. Nanoscale Res Lett 2017; 12:45. [PMID: 28097600 PMCID: PMC5241260 DOI: 10.1186/s11671-016-1788-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 12/13/2016] [Indexed: 06/06/2023]
Abstract
Network-forming As2(S/Se)m nanoclusters are employed to recognize expected variations in a vicinity of some remarkable compositions in binary As-Se/S glassy systems accepted as signatures of optimally constrained intermediate topological phases in earlier temperature-modulated differential scanning calorimetry experiments. The ab initio quantum chemical calculations performed using the cation-interlinking network cluster approach show similar oscillating character in tendency to local chemical decomposition but obvious step-like behavior in preference to global phase separation on boundary chemical compounds (pure chalcogen and stoichiometric arsenic chalcogenides). The onsets of stability are defined for chalcogen-rich glasses, these being connected with As2Se5 (Z = 2.29) and As2S6 (Z = 2.25) nanoclusters for As-Se and As-S glasses, respectively. The physical aging effects result preferentially from global phase separation in As-S glass system due to high localization of covalent bonding and local demixing on neighboring As2Sem+1 and As2Sem-1 nanoclusters in As-Se system. These nanoclusters well explain the lower limits of reversibility windows in temperature-modulated differential scanning calorimetry, but they cannot be accepted as signatures of topological phase transitions in respect to the rigidity theory.
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Affiliation(s)
- M Hyla
- Institute of Physics of Jan Dlugosz University of Czestochowa, Al. Armii Krajowej 13/15, 42-200, Czestochowa, Poland.
- Lviv Scientific-Research Institute of Materials of Scientific Research Company "Carat", Stryjska str. 202, Lviv, 79031, Ukraine.
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Shportko KV, Barlas TR, Baran J, Trukhan VM, Shoukavaya TV, Venger EF. Spectroscopy of the Surface Polaritons in the Cd XZn (1-X)P 2 Solid Solutions. Nanoscale Res Lett 2017; 12:87. [PMID: 28168611 PMCID: PMC5293703 DOI: 10.1186/s11671-017-1880-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Accepted: 01/31/2017] [Indexed: 06/06/2023]
Abstract
Here we report on the analysis of the effect of the doping of CdP2 single crystals by ZnP2 nanoclusters on the dispersion of the surface polaritons (SP). The ATR spectroscopic technique has been applied to excite the SP in the CdXZn(1-X)P2 system. Analysis of the obtained spectra has shown that the doping of CdP2 single crystals by ZnP2 nanoclusters result in the position and the width of the dispersion branches of the SP. This effect is more pronounced in the low frequency dispersion branches. These SP branches are originated from phonons which correspond to the motion of the cation sublattice.
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Affiliation(s)
- K. V. Shportko
- Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Nauki av. 45, Kyiv, 03028 Ukraine
| | - T. R. Barlas
- Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Nauki av. 45, Kyiv, 03028 Ukraine
| | - J. Baran
- Institute of Low Temperature and Structure Research, PAS, 2 Oko´lna Street, P.O. Box 1410, 50-950 Wroclaw 2, Poland
| | - V. M. Trukhan
- Scientific and Practical Center for Materials Science, National Academy of Sciences of Belarus, P. Brovki str. 19, 220072 Minsk, Belarus
| | - T. V. Shoukavaya
- Scientific and Practical Center for Materials Science, National Academy of Sciences of Belarus, P. Brovki str. 19, 220072 Minsk, Belarus
| | - E. F. Venger
- Lashkaryov Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Nauki av. 45, Kyiv, 03028 Ukraine
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Noh Y, Jo EJ, Mun H, Ahn YD, Kim MG. Homogeneous and selective detection of cadmium ions by forming fluorescent cadmium-protein nanoclusters. Chemosphere 2017; 174:524-530. [PMID: 28189897 DOI: 10.1016/j.chemosphere.2017.02.025] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 01/18/2017] [Accepted: 02/04/2017] [Indexed: 06/06/2023]
Abstract
We synthesized fluorescent Cd nanoclusters (CdNCs) through a protein-directed method, and the synthesis method was utilized for a homogeneous, ultrasensitive, and selective detection of cadmium ion (Cd2+). CdNCs were synthesized using a modified protein-directed method for developing a rapid Cd2+ detection system. For rapid Cd2+ detection, the reaction time was reduced by optimizing the reaction conditions such as temperature, reducing agent concentration, and protein concentration. The synthesized CdNCs had ca. 2 nm diameter and showed strong fluorescence at 485 nm under 365 nm UV light. The fluorescence of the CdNCs increased with increasing Cd2+ concentrations, and the limit of detection in deionized water was 15.68 fM. This method enables the detection of Cd2+ through the Cd concentration-dependent formation of fluorescent CdNCs in tap, fountain, and pond water samples with detection limits of 0.75, 7.65, and 48.2 fM, respectively. The sensitivity and specificity of our method are comparable to those of several existing methods for Cd2+ detection. Furthermore, the system enables the homogeneous detection of Cd2+ without separation and washing, thereby broadening its application in analytical chemistry.
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Affiliation(s)
- Yuseon Noh
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Eun-Jung Jo
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Hyoyoung Mun
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Young-Deok Ahn
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea
| | - Min-Gon Kim
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
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Shportko K, Shoukavaya T, Trukhan V, Baran J, Starik S, Venger E. The Role of ZnP2 Nanoclusters in the Vibrational Properties of Cd x Zn(1 - x)P2 Solid Solutions. Nanoscale Res Lett 2016; 11:423. [PMID: 27659952 PMCID: PMC5033797 DOI: 10.1186/s11671-016-1635-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 09/12/2016] [Indexed: 06/06/2023]
Abstract
This study reports an analysis of the IR reflectance and Raman spectra of Cd x Zn(1 - x)P2 solid solutions. We have analyzed the effect of the doping of the CdP2 single crystal by the ZnP2 nanoclusters on the vibrational properties of studied samples: ε 0, ε inf, phonon frequencies, and strengths. These dependencies might be used as an alternative non-destructive way for the control of the Cd x Zn(1 - x)P2 composition. The obtained results show that variation of the concentration of ZnP2 nanoclusters opens a space to design the tailored material properties for the industrial applications.
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Affiliation(s)
- K. Shportko
- Lashkarev Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Nauki av. 45, Kyiv, 03028 Ukraine
| | - T. Shoukavaya
- Scientific and Practical Center for Materials Science, National Academy of Sciences of Belarus, P. Brovki str. 19, Minsk, 220072 Belarus
| | - V. Trukhan
- Scientific and Practical Center for Materials Science, National Academy of Sciences of Belarus, P. Brovki str. 19, Minsk, 220072 Belarus
| | - J. Baran
- Institute of Low Temperature and Structure Research, PAS, 2 Oko’lna Street, P.O. Box 1410, 50-950 Wroclaw 2, Poland
| | - S. Starik
- Bakul Institute for Superhard Materials, National Academy of Sciences of Ukraine, Avtozavodska str., 2, Kyiv, 04074 Ukraine
| | - E. Venger
- Lashkarev Institute of Semiconductor Physics, National Academy of Sciences of Ukraine, Nauki av. 45, Kyiv, 03028 Ukraine
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Mori T, Hegmann T. Determining the composition of gold nanoparticles: a compilation of shapes, sizes, and calculations using geometric considerations. J Nanopart Res 2016; 18:295. [PMID: 27766020 PMCID: PMC5047942 DOI: 10.1007/s11051-016-3587-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/03/2016] [Indexed: 05/02/2023]
Abstract
ABSTRACT Size, shape, overall composition, and surface functionality largely determine the properties and applications of metal nanoparticles. Aside from well-defined metal clusters, their composition is often estimated assuming a quasi-spherical shape of the nanoparticle core. With decreasing diameter of the assumed circumscribed sphere, particularly in the range of only a few nanometers, the estimated nanoparticle composition increasingly deviates from the real composition, leading to significant discrepancies between anticipated and experimentally observed composition, properties, and characteristics. We here assembled a compendium of tables, models, and equations for thiol-protected gold nanoparticles that will allow experimental scientists to more accurately estimate the composition of their gold nanoparticles using TEM image analysis data. The estimates obtained from following the routines described here will then serve as a guide for further analytical characterization of as-synthesized gold nanoparticles by other bulk (thermal, structural, chemical, and compositional) and surface characterization techniques. While the tables, models, and equations are dedicated to gold nanoparticles, the composition of other metal nanoparticle cores with face-centered cubic lattices can easily be estimated simply by substituting the value for the radius of the metal atom of interest. GRAPHICAL ABSTRACT
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Affiliation(s)
- Taizo Mori
- Chemical Physics Interdisciplinary Program, Liquid Crystal Institute, Kent State University, Kent, OH 44242-0001 USA
- World Premier International (WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, 305-0044 Japan
| | - Torsten Hegmann
- Chemical Physics Interdisciplinary Program, Liquid Crystal Institute, Kent State University, Kent, OH 44242-0001 USA
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41
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Chaban VV. Systematic and efficient navigating potential energy surface: Data for silver doped gold clusters. Data Brief 2016; 7:1321-6. [PMID: 27158643 DOI: 10.1016/j.dib.2016.04.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 02/08/2016] [Accepted: 04/05/2016] [Indexed: 11/23/2022] Open
Abstract
Locating global minimum of certain atomistic ensemble is known to be a highly challenging and resource consuming task. This dataset represents joint usage of the semi-empirical PM7 Hamiltonian, Broyden-Fletcher-Goldfarb-Shanno algorithm and basin hopping scheme to navigate a potential energy surface. The Au20 nanocluster was used for calibration as its global minimum structure is well-known. Furthermore, Au18Ag2 and Au15Ag5 were simulated for illustration of the algorithm performance. The work shows encouraging results and, particularly, underlines proper accuracy of PM7 as applied to this type of heavy metal systems. The reported dataset motivates to use the benchmarked method for studying potential energy surfaces of manifold systems and locate their global-minimum atomistic configurations.
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Smith CE, Ernenwein D, Shkumatov A, Clay NE, Lee J, Melhem M, Misra S, Zimmerman SC, Kong H. Hydrophilic packaging of iron oxide nanoclusters for highly sensitive imaging. Biomaterials 2015; 69:184-90. [PMID: 26291408 PMCID: PMC4556553 DOI: 10.1016/j.biomaterials.2015.07.056] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2015] [Revised: 07/27/2015] [Accepted: 07/31/2015] [Indexed: 11/29/2022]
Abstract
Superparamagnetic iron oxide nanoparticles (SPIONs) are used as imaging probes to provide contrast in magnetic resonance images. Successful use of SPIONs in targeted applications greatly depends on their ability to generate contrast, even at low levels of accumulation, in the tissue of interest. In the present study, we report that SPION nanoclusters packaged to a controlled size by a hyperbranched polyglycerol (HPG) can target tissue defects and have a high relaxivity of 719 mM(-1) s(-1), which was close to their theoretical maximal limit. The resulting nanoclusters were able to identify regions of defective vasculature in an ischemic murine hindlimb using MRI with iron doses that were 5-10 fold lower than those typically used in preclinical studies. Such high relaxivity was attributed to the molecular architecture of HPG, which mimics that of the water retentive polysaccharide, glycogen. The results of this study will be broadly useful in sensitive imaging applications.
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Affiliation(s)
- Cartney E Smith
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Dawn Ernenwein
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Artem Shkumatov
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, 2001 South Lincoln Avenue, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL 61801, USA
| | - Nicholas E Clay
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - JuYeon Lee
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Molly Melhem
- Department of Bioengineering, University of Illinois at Urbana-Champaign, 1304 West Springfield Avenue, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL 61801, USA
| | - Sanjay Misra
- Department of Radiology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA
| | - Steven C Zimmerman
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
| | - Hyunjoon Kong
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA; Institute for Genomic Biology, University of Illinois at Urbana-Champaign, 1206 West Gregory Drive, Urbana, IL 61801, USA.
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43
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Ahmad NF, Yasui K, Hashim AM. Seed/catalyst-free growth of zinc oxide on graphene by thermal evaporation: effects of substrate inclination angles and graphene thicknesses. Nanoscale Res Lett 2015; 10:10. [PMID: 25852308 PMCID: PMC4311902 DOI: 10.1186/s11671-014-0716-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 12/26/2014] [Indexed: 05/07/2023]
Abstract
A seed/catalyst-free growth of ZnO on graphene by thermal evaporation of Zn in the presence of O2 gas was further studied. The effects of substrate positions and graphene thicknesses on the morphological, structural, and optical properties were found to be very pronounced. By setting the substrate to be inclined at 90°, the growth of ZnO nanostructures, namely, nanoclusters and nanorods, on single-layer (SL) graphene was successfully realized at temperatures of 600°C and 800°C, respectively. For the growth on multilayer (ML) graphene at 600°C with an inclination angle of 90°, the grown structures show extremely thick and continuous cluster structures as compared to the growth with substrate's inclination angle of 45°. Moreover, the base of nanorod structures grown at 800°C with an inclination angle of 90° also become thicker as compared to 45°, even though their densities and aspect ratios were almost unchanged. Photoluminescence (PL) spectra of the grown ZnO structures were composed of the UV emission (378-386 nm) and the visible emission (517-550 nm), and the intensity ratio of the former emission (I UV) to the latter emission (I VIS) changed, depending on the temperature. The structures grown at a low temperature of 600°C show the highest value of I UV/I VIS of 16.2, which is almost two times higher than the structures grown on SL graphene, indicating fewer structural defects. The possible growth mechanism was proposed and described which considered both the nucleation and oxidation processes. From the results obtained, it can be concluded that temperature below 800°C, substrate position inclined at 90° towards the gas flow, and ML graphene seems to be preferable parameters for the growth of ZnO structures by thermal evaporation because these factors can be used to overcome the problem of graphene's oxidation that takes place during the growth.
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Affiliation(s)
- Nurul Fariha Ahmad
- />Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia
| | - Kanji Yasui
- />Department of Electrical Engineering, Nagaoka University of Technology, Kamitomioka-machi, Nagaoka, Niigata 940-2137 Japan
| | - Abdul Manaf Hashim
- />Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, 54100 Kuala Lumpur, Malaysia
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Maity PC, Yang J, Klaesener K, Reth M. The nanoscale organization of the B lymphocyte membrane. Biochim Biophys Acta 2014; 1853:830-40. [PMID: 25450974 PMCID: PMC4547082 DOI: 10.1016/j.bbamcr.2014.11.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2014] [Revised: 10/30/2014] [Accepted: 11/07/2014] [Indexed: 12/13/2022]
Abstract
The fluid mosaic model of Singer and Nicolson correctly predicted that the plasma membrane (PM) forms a lipid bi-layer containing many integral trans-membrane proteins. This model also suggested that most of these proteins were randomly dispersed and freely diffusing moieties. Initially, this view of a dynamic and rather unorganized membrane was supported by early observations of the cell surfaces using the light microscope. However, recent studies on the PM below the diffraction limit of visible light (~250nm) revealed that, at nanoscale dimensions, membranes are highly organized and compartmentalized structures. Lymphocytes are particularly useful to study this nanoscale membrane organization because they grow as single cells and are not permanently engaged in cell:cell contacts within a tissue that can influence membrane organization. In this review, we describe the methods that can be used to better study the protein:protein interaction and nanoscale organization of lymphocyte membrane proteins, with a focus on the B cell antigen receptor (BCR). Furthermore, we discuss the factors that may generate and maintain these membrane structures.
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Affiliation(s)
- Palash Chandra Maity
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Germany; Department of Molecular Immunology, Biology III, University of Freiburg, Germany; Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany.
| | - Jianying Yang
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Germany; Department of Molecular Immunology, Biology III, University of Freiburg, Germany; Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Kathrin Klaesener
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Germany; Department of Molecular Immunology, Biology III, University of Freiburg, Germany; Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany
| | - Michael Reth
- BIOSS Centre for Biological Signalling Studies, University of Freiburg, Germany; Department of Molecular Immunology, Biology III, University of Freiburg, Germany; Max Planck Institute of Immunobiology and Epigenetics, Freiburg, Germany.
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Neve-Oz Y, Razvag Y, Sajman J, Sherman E. Mechanisms of localized activation of the T cell antigen receptor inside clusters. Biochim Biophys Acta 2014; 1853:810-21. [PMID: 25300584 DOI: 10.1016/j.bbamcr.2014.09.025] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Revised: 09/07/2014] [Accepted: 09/29/2014] [Indexed: 01/21/2023]
Abstract
The T cell antigen receptor (TCR) has been shown to cluster both before and upon engagement with cognate antigens. However, the effect of TCR clustering on its activation remains poorly understood. Here, we used two-color photo-activated localization microscopy (PALM) to visualize individual molecules of TCR and ZAP-70, as a marker of TCR activation and phosphorylation, at the plasma membrane of uniformly activated T cells. Imaging and second-order statistics revealed that ZAP-70 recruitment and TCR activation localized inside TCR clusters. Live cell PALM imaging showed that the extent of localized TCR activation decreased, yet remained significant, with cell spreading. Using dynamic modeling and Monte-Carlo simulations we evaluated possible mechanisms of localized TCR activation. Our simulations indicate that localized TCR activation is the result of long-range cooperative interactions between activated TCRs, or localized activation by Lck and Fyn. Our results demonstrate the role of molecular clustering in cell signaling and activation, and are relevant to studying a wide range of multi-molecular complexes. This article is part of a Special Issue entitled: Nanoscale membrane organisation and signalling.
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Affiliation(s)
- Yair Neve-Oz
- Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
| | - Yair Razvag
- Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
| | - Julia Sajman
- Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
| | - Eilon Sherman
- Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel.
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46
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Liu Y, Wu Z, Zhang H. Deriving the colloidal synthesis of crystalline nanosheets to create self-assembly monolayers of nanoclusters. Adv Colloid Interface Sci 2014; 207:347-60. [PMID: 24355252 DOI: 10.1016/j.cis.2013.11.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2013] [Revised: 11/04/2013] [Accepted: 11/18/2013] [Indexed: 11/22/2022]
Abstract
Two-dimensional (2D) nanomaterials with the thickness at atomic level are promising candidates for a wide range of applications, and now reach the point to create diversified 2D architectures. The colloidal synthesis route is powerful to produce crystalline nanosheets, nanoribbons and nanoplatelets, and the self-assembly strategy is robust to integrate the functionalities of different nano-objects. In this review, we bridge the colloidal synthesis of nanosheets and the 2D self-assembly of nanoclusters (NCs) with the aim to further optimize the physical and chemical properties of 2D nanomaterials. Ultrasmall NCs, the intermediate for synthesizing nanosheets, are highlighted to show the similarity of 2D crystallization and 2D self-assembly. The modification of conventional 2D colloidal synthesis route greatly permits the controlled self-assembly of NCs into free-standing monolayers in colloidal solutions.
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Guzmán C, Šolman M, Ligabue A, Blaževitš O, Andrade DM, Reymond L, Eggeling C, Abankwa D. The efficacy of Raf kinase recruitment to the GTPase H-ras depends on H-ras membrane conformer-specific nanoclustering. J Biol Chem 2014; 289:9519-33. [PMID: 24569991 DOI: 10.1074/jbc.m113.537001] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Solution structures and biochemical data have provided a wealth of mechanistic insight into Ras GTPases. However, information on how much the membrane organization of these lipid-modified proteins impacts on their signaling is still scarce. Ras proteins are organized into membrane nanoclusters, which are necessary for Ras-MAPK signaling. Using quantitative conventional and super-resolution fluorescence methods, as well as mathematical modeling, we investigated nanoclustering of H-ras helix α4 and hypervariable region mutants that have different bona fide conformations on the membrane. By following the emergence of conformer-specific nanoclusters in the plasma membrane of mammalian cells, we found that conformers impart distinct nanoclustering responses depending on the cytoplasmic levels of the nanocluster scaffold galectin-1. Computational modeling revealed that complexes containing H-ras conformers and galectin-1 affect both the number and lifetime of nanoclusters and thus determine the specific Raf effector recruitment. Our results show that mutations in Ras can affect its nanoclustering response and thus allosterically effector recruitment and downstream signaling. We postulate that cancer- and developmental disease-linked mutations that are associated with the Ras membrane conformation may exhibit so far unrecognized Ras nanoclustering and therefore signaling alterations.
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Affiliation(s)
- Camilo Guzmán
- From the Turku Centre for Biotechnology, Åbo Akademi University, Tykistökatu 6B, 20520 Turku, Finland
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Wang L, Hess A, Chang TZ, Wang YC, Champion JA, Compans RW, Wang BZ. Nanoclusters self-assembled from conformation-stabilized influenza M2e as broadly cross-protective influenza vaccines. Nanomedicine 2013; 10:473-82. [PMID: 23988715 DOI: 10.1016/j.nano.2013.08.005] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2013] [Revised: 07/23/2013] [Accepted: 08/14/2013] [Indexed: 01/10/2023]
Abstract
UNLABELLED Influenza vaccines with broad cross-protection are urgently needed. The highly conserved ectodomain of the influenza matrix protein 2 (M2e) can be a promising candidate if its low immunogenicity was overcome. In this study, we generated protein nanoclusters self-assembled from conformation-stabilized M2e tetramers (tM2e) to improve its immunogenicity. The resulting nanoclusters showed an average hydrodynamic diameter of 227 nm. Vaccination with the nanoclusters by an intranasal route elicited high levels of serum antigen-specific IgG in mice (approximately 100-fold higher than that obtained with soluble tM2e), as well as antigen-specific T cell and mucosal antibody responses. The immunity conferred complete protection against lethal challenge with homo- as well as heterosubtypic viruses. These results demonstrate that nanoclusters assembled from conformation-stabilized M2e are promising as a potential universal influenza A vaccine. Self-assembly into nanoclusters represents a novel approach for increasing the immunogenicity of vaccine antigens. FROM THE CLINICAL EDITOR In order to develop more effective influenza vaccination, the highly conserved ectodomain of M2e could be a promising candidate. Unfortunately, it is a weak antigen for vaccination purposes. In this study, self-assembled protein nanoclusters of tM2e were generated and tested. The nanoclusters demonstrated superior vaccination properties, with complete protection against lethal challenge in the studied rodent model, raising hope for the introduction of similar vaccines to challenge human influenza outbreaks.
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Affiliation(s)
- Li Wang
- Department of Microbiology and Immunology, and Emory Vaccine Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Annie Hess
- Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, Atlanta, GA, USA
| | - Timothy Z Chang
- Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, Atlanta, GA, USA
| | - Ying-Chun Wang
- Department of Microbiology and Immunology, and Emory Vaccine Center, Emory University School of Medicine, Atlanta, GA, USA
| | - Julie A Champion
- Georgia Institute of Technology, School of Chemical and Biomolecular Engineering, Atlanta, GA, USA.
| | - Richard W Compans
- Department of Microbiology and Immunology, and Emory Vaccine Center, Emory University School of Medicine, Atlanta, GA, USA.
| | - Bao-Zhong Wang
- Department of Microbiology and Immunology, and Emory Vaccine Center, Emory University School of Medicine, Atlanta, GA, USA.
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