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Shao G, Jing C, Ma Z, Li Y, Dang W, Guo D, Wu M, Liu S, Zhang X, He K, Yuan Y, Luo J, Dai S, Xu J, Zhou Z. Dynamic coordination engineering of 2D PhenPtCl 2 nanosheets for superior hydrogen evolution. Nat Commun 2024; 15:385. [PMID: 38195636 PMCID: PMC10776781 DOI: 10.1038/s41467-024-44717-1] [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: 09/15/2023] [Accepted: 01/02/2024] [Indexed: 01/11/2024] Open
Abstract
Exploring the dynamic structural evolution of electrocatalysts during reactions represents a fundamental objective in the realm of electrocatalytic mechanism research. In pursuit of this objective, we synthesized PhenPtCl2 nanosheets, revealing a N2-Pt-Cl2 coordination structure through various characterization techniques. Remarkably, the electrocatalytic performance of these PhenPtCl2 nanosheets for hydrogen evolution reaction (HER) surpasses that of the commercial Pt/C catalyst across the entire pH range. Furthermore, our discovery of the dynamic coordination changes occurring in the N2-Pt-Cl2 active sites during the electrocatalytic process, as clarified through in situ Raman and X-ray photoelectron spectroscopy, is particularly noteworthy. These changes transition from Phen-Pt-Cl2 to Phen-Pt-Cl and ultimately to Phen-Pt. The Phen-Pt intermediate plays a pivotal role in the electrocatalytic HER, dynamically coordinating with Cl- ions in the electrolyte. Additionally, the unsaturated, two-coordinated Pt within Phen-Pt provides additional space and electrons to enhance both H+ adsorption and H2 evolution. This research illuminates the intricate dynamic coordination evolution and structural adaptability of PhenPtCl2 nanosheets, firmly establishing them as a promising candidate for efficient and tunable electrocatalysts.
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Affiliation(s)
- Gonglei Shao
- Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE2), School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, PR China.
| | - Changfei Jing
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, PR China
- Feringa Nobel Prize Scientist Joint Research Centre, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, PR China
| | - Zhinan Ma
- School of Chemistry and Chemical Engineering, North University of China, Taiyuan, 030051, Shanxi, PR China
| | - Yuanyuan Li
- School of Sciences, Henan University of Technology, Zhengzhou, 450001, PR China
| | - Weiqi Dang
- National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, PR China
| | - Dong Guo
- Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE2), School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Manman Wu
- Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE2), School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Song Liu
- Institute of Chemical Biology and Nanomedicine (ICBN), State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, PR China
| | - Xu Zhang
- Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE2), School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
| | - Kun He
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, PR China
| | - Yifei Yuan
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, PR China
| | - Jun Luo
- ShenSi Lab, Shenzhen Institute for Advanced Study, University of Electronic Science and Technology of China, Longhua District, Shenzhen, 518110, PR China
| | - Sheng Dai
- Feringa Nobel Prize Scientist Joint Research Centre, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, PR China.
| | - Jie Xu
- College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, 325035, PR China.
| | - Zhen Zhou
- Interdisciplinary Research Center for Sustainable Energy Science and Engineering (IRC4SE2), School of Chemical Engineering, Zhengzhou University, Zhengzhou, 450001, PR China.
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Li L, Dang W, Zhu X, Lan H, Ding Y, Li ZA, Wang L, Yang Y, Fu L, Miao F, Zeng M. Ultrathin Van der Waals Lanthanum Oxychloride Dielectric for 2D Field-Effect Transistors. Adv Mater 2023:e2309296. [PMID: 38065546 DOI: 10.1002/adma.202309296] [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] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 11/23/2023] [Indexed: 12/29/2023]
Abstract
Downsizing silicon-based transistors can result in lower power consumption, faster speeds, and greater computational capacity, although it is accompanied by the appearance of short-channel effects. The integration of high-mobility 2D semiconductor channels with ultrathin high dielectric constant (high-κ) dielectric in transistors is expected to suppress the effect. Nevertheless, the absence of a high-κ dielectric layer featuring an atomically smooth surface devoid of dangling bonds poses a significant obstacle in the advancement of 2D electronics. Here, ultrathin van der Waals (vdW) lanthanum oxychloride (LaOCl) dielectrics are successfully synthesized by precisely controlling the growth kinetics. These dielectrics demonstrate an impressive high-κ value of 10.8 and exhibit a remarkable breakdown field strength (Ebd ) exceeding 10 MV cm-1 . Remarkably, the conventional molybdenum disulfide (MoS2 ) field-effect transistor (FET) featuring a dielectric made of LaOCl showcases an almost negligible hysteresis when compared to FETs employing alternative gate dielectrics. This can be attributed to the flawlessly formed vdW interface and excellent compatibility established between LaOCl and MoS2 . These findings will motivate the further exploration of rare-earth oxychlorides and the development of more-than-Moore nanoelectronic devices.
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Affiliation(s)
- Linyang Li
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Weiqi Dang
- National Laboratory of Solid State Microstructures, School of Physics, Institute of Brain-Inspired Intelligence, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, China
| | - Xiaofei Zhu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Haihui Lan
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Yiran Ding
- The Institute for Advanced Studies (IAS), Wuhan University, Wuhan, 430072, China
| | - Zhu-An Li
- National Laboratory of Solid State Microstructures, School of Physics, Institute of Brain-Inspired Intelligence, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, China
| | - Luyang Wang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Yuekun Yang
- National Laboratory of Solid State Microstructures, School of Physics, Institute of Brain-Inspired Intelligence, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, China
| | - Lei Fu
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
- The Institute for Advanced Studies (IAS), Wuhan University, Wuhan, 430072, China
- Institute of Molecular Medicine, Renmin Hospital of Wuhan University, Wuhan, 410013, China
| | - Feng Miao
- National Laboratory of Solid State Microstructures, School of Physics, Institute of Brain-Inspired Intelligence, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210023, China
| | - Mengqi Zeng
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
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Lu Z, Chen Y, Dang W, Kong L, Tao Q, Ma L, Lu D, Liu L, Li W, Li Z, Liu X, Wang Y, Duan X, Liao L, Liu Y. Wafer-scale high-κ dielectrics for two-dimensional circuits via van der Waals integration. Nat Commun 2023; 14:2340. [PMID: 37095079 PMCID: PMC10125989 DOI: 10.1038/s41467-023-37887-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 04/04/2023] [Indexed: 04/26/2023] Open
Abstract
The practical application of two-dimensional (2D) semiconductors for high-performance electronics requires the integration with large-scale and high-quality dielectrics-which however have been challenging to deposit to date, owing to their dangling-bonds-free surface. Here, we report a dry dielectric integration strategy that enables the transfer of wafer-scale and high-κ dielectrics on top of 2D semiconductors. By utilizing an ultra-thin buffer layer, sub-3 nm thin Al2O3 or HfO2 dielectrics could be pre-deposited and then mechanically dry-transferred on top of MoS2 monolayers. The transferred ultra-thin dielectric film could retain wafer-scale flatness and uniformity without any cracks, demonstrating a capacitance up to 2.8 μF/cm2, equivalent oxide thickness down to 1.2 nm, and leakage currents of ~10-7 A/cm2. The fabricated top-gate MoS2 transistors showed intrinsic properties without doping effects, exhibiting on-off ratios of ~107, subthreshold swing down to 68 mV/dec, and lowest interface states of 7.6×109 cm-2 eV-1. We also show that the scalable top-gate arrays can be used to construct functional logic gates. Our study provides a feasible route towards the vdW integration of high-κ dielectric films using an industry-compatible ALD process with well-controlled thickness, uniformity and scalability.
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Affiliation(s)
- Zheyi Lu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Yang Chen
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Weiqi Dang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Lingan Kong
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Quanyang Tao
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Likuan Ma
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Donglin Lu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Liting Liu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Wanying Li
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Zhiwei Li
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Xiao Liu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Yiliu Wang
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Xidong Duan
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Lei Liao
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Yuan Liu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha, 410082, China.
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4
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Chen L, Dang W, Lin X, Chen G. Continuous transport of zinc(II) by ammonium chloride media via supported liquid membrane system. ELECTROANAL 2022. [DOI: 10.1002/elan.202200455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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5
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Dang W, Lu Z, Zhao B, Li B, Li J, Zhang H, Song R, Hossain M, Le Z, Liu Y, Duan X. Ultimate low leakage and EOT of high- κdielectric using transferred metal electrode. Nanotechnology 2022; 33:395201. [PMID: 35675787 DOI: 10.1088/1361-6528/ac76d4] [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: 03/08/2022] [Accepted: 06/07/2022] [Indexed: 06/15/2023]
Abstract
The increase of gate leakage current when the gate dielectric layer is thinned is a key issue for device scalability. For scaling down the integrated circuits, a thin gate dielectric layer with a low leakage current is essential. Currently, changing the dielectric layer material or enhancing the surface contact between the gate dielectric and the channel material is the most common way to reduce gate leakage current in devices. Herein, we report a technique of enhancing the surface contact between the gate dielectric and the metal electrode, that is constructing an Au/Al2O3/Si metal-oxide-semiconductor device by replacing the typical evaporated electrode/dielectric layer contact with a transferred electrode/high-κdielectric layer contact. The contact with a mild, non-invasive interface can ensure the intrinsic insulation of the dielectric layer. By applying 2-40 nm Al2O3as the dielectric layer, the current density-electrical field (J-E) measurement reveals that the dielectric leakage generated by the transferred electrode is less than that obtained by the typical evaporated electrode with a ratio of 0.3 × 101 ∼ 5 × 106atVbias = 1 V. Furthermore, atJ = 1 mA cm-2, the withstand voltage can be raised by 100-102times over that of an evaporated electrode. The capacitance-voltage (C-V) test shows that the transferred metal electrode can efficiently scale the equivalent oxide layer thickness (EOT) to 1.58 nm, which is a relatively smaller value than the overall reported Si-based device's EOT. This finding successfully illustrates that the transferred electrode/dielectric layer's mild contact can balance the scaling of the gate dielectric layer with a minimal leakage current and constantly reduce the EOT. Our enhanced electrode/dielectric contact approach provides a straightforward and effective pathway for further scaling of devices in integrated circuits and significantly decreases the overall integrated circuit's static power consumption (ICs).
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Affiliation(s)
- Weiqi Dang
- Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Zheyi Lu
- Hunan Key Laboratory of Two-Dimensional Materials, Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
| | - Bei Zhao
- Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Bo Li
- Hunan Key Laboratory of Two-Dimensional Materials, Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
| | - Jia Li
- Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Hongmei Zhang
- Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Rong Song
- Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Mongur Hossain
- Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
| | - Zhikai Le
- Hunan Key Laboratory of Two-Dimensional Materials, Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
| | - Yuan Liu
- Hunan Key Laboratory of Two-Dimensional Materials, Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
| | - Xidong Duan
- Hunan Key Laboratory of Two-Dimensional Materials and State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, People's Republic of China
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6
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Li W, Liu L, Tao Q, Chen Y, Lu Z, Kong L, Dang W, Zhang W, Li Z, Li Q, Tang J, Ren L, Song W, Duan X, Ma C, Xiang Y, Liao L, Liu Y. Realization of Ultra-Scaled MoS 2 Vertical Diodes via Double-Side Electrodes Lamination. Nano Lett 2022; 22:4429-4436. [PMID: 35616710 DOI: 10.1021/acs.nanolett.2c00922] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Schottky diode is the fundamental building blocks for modern electronics and optoelectronics. Reducing the semiconductor layer thickness could shrink the vertical size of a Schottky diode, improving its speed and integration density. Here, we demonstrate a new approach to fabricate a Schottky diode with ultrashort physical length approaching atomic limit. By mechanically laminating prefabricated metal electrodes on both-sides of two-dimensional MoS2, the intrinsic metal-semiconductor interfaces can be well retained. As a result, we demonstrate the thinnest Schottky diode with a length of 2.6 nm and decent rectification behavior. Furthermore, with a diode length smaller than the semiconductor depletion length, the carrier transport mechanisms are investigated and explained by thickness-dependent and temperature-dependent electrical measurements. Our study not only pushes the scaling limit of a Schottky diode but also provides a general double-sided electrodes integration approach for other ultrathin vertical devices.
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Affiliation(s)
- Wanying Li
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Liting Liu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Quanyang Tao
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Yang Chen
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Zheyi Lu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Lingan Kong
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Weiqi Dang
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Wujun Zhang
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials Science and Engineering, Hunan University, Changsha 410082, China
| | - Zhiwei Li
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Qianyuan Li
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Jie Tang
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Liwang Ren
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Wenjing Song
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Xidong Duan
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Chao Ma
- Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials Science and Engineering, Hunan University, Changsha 410082, China
| | - Yuanjiang Xiang
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Lei Liao
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Yuan Liu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, Changsha 410082, China
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7
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Zhang H, Li Q, Hossain M, Li B, Chen K, Huang Z, Yang X, Dang W, Shu W, Wang D, Li B, Xu W, Zhang Z, Yu G, Duan X. Phase-Selective Synthesis of Ultrathin FeTe Nanoplates by Controllable Fe/Te Atom Ratio in the Growth Atmosphere. Small 2021; 17:e2101616. [PMID: 34270865 DOI: 10.1002/smll.202101616] [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] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 05/11/2021] [Indexed: 06/13/2023]
Abstract
Phase controllable synthesis of 2D materials is of significance for tuning related electrical, optical, and magnetic properties. Herein, the phase-controllable synthesis of tetragonal and hexagonal FeTe nanoplates has been realized by a rational control of the Fe/Te ratio in a chemical vapor deposition system. Using density functional theory calculations, it has been revealed that with the change of the Fe/Te ratio, the formation energy of active clusters changes, causing the phase-controllable synthesis of FeTe nanoplates. The thickness of the obtained FeTe nanoplates can be tuned down to the 2D limit (2.8 nm for tetragonal and 1.4 nm for hexagonal FeTe). X-ray diffraction pattern, transmission electron microscopy, and high resolution scanning transmission electron microscope analyses exhibit the high crystallinity of the as-grown FeTe nanoplates. The two kinds of FeTe nanoflakes show metallic behavior and good electrical conductivity, featuring 8.44 × 104 S m-1 for 9.8 nm-thick tetragonal FeTe and 5.45 × 104 S m-1 for 7.6 nm-thick hexagonal FeTe. The study provides an efficient and convenient route for tailoring the phases of FeTe nanoplates, which benefits to study phase-sensitive properties, and may pave the way for the synthesis of other multiphase 2D nanosheets with controllable phases.
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Affiliation(s)
- Hongmei Zhang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Qiuqiu Li
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Mongur Hossain
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Bo Li
- Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Keqiu Chen
- Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Ziwei Huang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Xiangdong Yang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Weiqi Dang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Weining Shu
- Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Di Wang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Bailing Li
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Weiting Xu
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
- Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha, 410082, China
| | - Zucheng Zhang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Gang Yu
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
| | - Xidong Duan
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
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8
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Pan F, Wang X, Wen B, Wang C, Xu Y, Dang W, Zhang M. Development of walnut oil and almond oil blends for improvements in nutritional and oxidative stability. Grasas y Aceites 2020. [DOI: 10.3989/gya.0920192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
For the increase in oxidative stability and phytonutrient contents of walnut oil (WO), 5, 10, 20 and 30% blends with almond oil (AO) were prepared. The fatty acid compositions and the micronutrients of the oil samples such as tocopherol, phytosterol and squalene were measured by GC-MS and HPLC. It was found that the proportions of PUFAs/SFAs in blended oils with high AO contents were lowered, and the blends contained higher levels of tocopherols, phytosterols and squalene than those of pure WO. The 60 °C oven accelerated oxidation test was used to determine the oxidative stability of the blended oil. The fatty acid composition, micronutrients and oxidation products were determined. The results showed that the oxidation stability of the blended oil increased with an increasing proportion of AO. In addition, a significant negative correlation between micronutrient and oxidation products was observed as the number of days of oxidation increased.
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9
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Kong L, Zhang X, Tao Q, Zhang M, Dang W, Li Z, Feng L, Liao L, Duan X, Liu Y. Doping-free complementary WSe 2 circuit via van der Waals metal integration. Nat Commun 2020; 11:1866. [PMID: 32313257 PMCID: PMC7171173 DOI: 10.1038/s41467-020-15776-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Accepted: 03/26/2020] [Indexed: 11/23/2022] Open
Abstract
Two-dimensional (2D) semiconductors have attracted considerable attention for the development of ultra-thin body transistors. However, the polarity control of 2D transistors and the achievement of complementary logic functions remain critical challenges. Here, we report a doping-free strategy to modulate the polarity of WSe2 transistors using same contact metal but different integration methods. By applying low-energy van der Waals integration of Au electrodes, we observed robust and optimized p-type transistor behavior, which is in great contrast to the transistors fabricated on the same WSe2 flake using conventional deposited Au contacts with pronounced n-type characteristics. With the ability to switch majority carrier type and to achieve optimized contact for both electrons and holes, a doping-free logic inverter is demonstrated with higher voltage gain of 340, at the bias voltage of 5.5 V. Furthermore, the simple polarity control strategy is extended for realizing more complex logic functions such as NAND and NOR.
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Affiliation(s)
- Lingan Kong
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, 410082, Changsha, China
| | - Xiaodong Zhang
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, 710072, Xi'an, China
| | - Quanyang Tao
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, 410082, Changsha, China
| | - Mingliang Zhang
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, 410082, Changsha, China
| | - Weiqi Dang
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Zhiwei Li
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, 410082, Changsha, China
| | - Liping Feng
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, 710072, Xi'an, China.
| | - Lei Liao
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, 410082, Changsha, China
| | - Xiangfeng Duan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USA.
| | - Yuan Liu
- Key Laboratory for Micro-Nano Optoelectronic Devices of Ministry of Education, School of Physics and Electronics, Hunan University, 410082, Changsha, China.
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10
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Yu R, Wang J, Han M, Zhang M, Zeng P, Dang W, Liu J, Yang Z, Hu J, Tian Z. Overcurrent Electrodeposition of Fractal Plasmonic Black Gold with Broad-Band Absorption Properties for Excitation-Immune SERS. ACS Omega 2020; 5:8293-8298. [PMID: 32309740 PMCID: PMC7161050 DOI: 10.1021/acsomega.0c00698] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2020] [Accepted: 03/19/2020] [Indexed: 05/22/2023]
Abstract
The dependence of plasmon resonance on the size, shape, and interparticle spacing of single, isolated nanostructures inherently limits their light-harvesting capability to a narrow spectral band. Here, we report a facile overcurrent electrodeposition strategy to prepare fractal plasmonic black gold (B-Au) with broad-band absorption properties (over 80% throughout the range of 300-1800 nm). The broad-band absorption properties are attributed to the excitation of multiple plasmons in the B-Au, which results in strong light-matter interaction over a broad-band spectral window. Consequently, the B-Au can produce strong broad-band surface-enhanced Raman scattering (SERS) regardless of the excitation light used. These findings demonstrate that the fractal B-Au allows efficient utilization of broad spectral photons and opens up exciting opportunities for highly sensitive SERS detection, photocatalysis, and photovoltaic devices.
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Affiliation(s)
- Renpeng Yu
- State
Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory
of Two-Dimensional Materials, and College of Chemistry and Chemical
Engineering, Hunan University, Changsha 410082, China
| | - Jingyu Wang
- Department
of Physics, Research Institute for Biomimetics and Soft Matter, Xiamen University, Xiamen 361005, China
| | - Mei Han
- State
Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory
of Two-Dimensional Materials, and College of Chemistry and Chemical
Engineering, Hunan University, Changsha 410082, China
| | - Mengyao Zhang
- State
Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory
of Two-Dimensional Materials, and College of Chemistry and Chemical
Engineering, Hunan University, Changsha 410082, China
| | - Pei Zeng
- School
of Physics and Electronics, State Key Laboratory of Advanced Design
and Manufacturing for Vehicle Body, Hunan
University, Changsha 410082, China
| | - Weiqi Dang
- State
Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory
of Two-Dimensional Materials, and College of Chemistry and Chemical
Engineering, Hunan University, Changsha 410082, China
| | - Jianfang Liu
- State
Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory
of Two-Dimensional Materials, and College of Chemistry and Chemical
Engineering, Hunan University, Changsha 410082, China
| | - Zhilin Yang
- Department
of Physics, Research Institute for Biomimetics and Soft Matter, Xiamen University, Xiamen 361005, China
| | - Jiawen Hu
- State
Key Laboratory for Chemo/Biosensing and Chemometrics, Hunan Key Laboratory
of Two-Dimensional Materials, and College of Chemistry and Chemical
Engineering, Hunan University, Changsha 410082, China
| | - Zhongqun Tian
- State
Key Laboratory for Physical Chemistry of Solid Surfaces and Department
of Chemistry, Xiamen University, Xiamen 361005, China
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11
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Yang G, Shao Y, Niu J, Ma X, Lu C, Wei W, Chuai X, Wang J, Cao J, Huang H, Xu G, Shi X, Ji Z, Lu N, Geng D, Qi J, Cao Y, Liu Z, Liu L, Huang Y, Liao L, Dang W, Zhang Z, Liu Y, Duan X, Chen J, Fan Z, Jiang X, Wang Y, Li L, Gao HJ, Duan X, Liu M. Possible Luttinger liquid behavior of edge transport in monolayer transition metal dichalcogenide crystals. Nat Commun 2020; 11:659. [PMID: 32005802 PMCID: PMC6994668 DOI: 10.1038/s41467-020-14383-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Accepted: 12/24/2019] [Indexed: 11/09/2022] Open
Abstract
In atomically-thin two-dimensional (2D) semiconductors, the nonuniformity in current flow due to its edge states may alter and even dictate the charge transport properties of the entire device. However, the influence of the edge states on electrical transport in 2D materials has not been sufficiently explored to date. Here, we systematically quantify the edge state contribution to electrical transport in monolayer MoS2/WSe2 field-effect transistors, revealing that the charge transport at low temperature is dominated by the edge conduction with the nonlinear behavior. The metallic edge states are revealed by scanning probe microscopy, scanning Kelvin probe force microscopy and first-principle calculations. Further analyses demonstrate that the edge-state dominated nonlinear transport shows a universal power-law scaling relationship with both temperature and bias voltage, which can be well explained by the 1D Luttinger liquid theory. These findings demonstrate the Luttinger liquid behavior in 2D materials and offer important insights into designing 2D electronics.
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Affiliation(s)
- Guanhua Yang
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Yan Shao
- Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
- School of Information and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, 100081, Beijing, China
| | - Jiebin Niu
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Xiaolei Ma
- School of Information Science and Engineering, Shandong University, 250100, Jinan, China
- Institute of Semiconductors, Chinese Academy of Sciences, 100083, Beijing, China
| | - Congyan Lu
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Wei Wei
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
- School of Information Science and Engineering, Shandong University, 250100, Jinan, China
| | - Xichen Chuai
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Jiawei Wang
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Jingchen Cao
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Hao Huang
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, 430072, Wuhan, China
| | - Guangwei Xu
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Xuewen Shi
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Zhuoyu Ji
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Nianduan Lu
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Di Geng
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China
| | - Jing Qi
- Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
| | - Yun Cao
- Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
| | - Zhongliu Liu
- Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
| | - Liwei Liu
- School of Information and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, 100081, Beijing, China
| | - Yuan Huang
- Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
| | - Lei Liao
- Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, 430072, Wuhan, China
| | - Weiqi Dang
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Zhengwei Zhang
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Yuan Liu
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Xidong Duan
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Jiezhi Chen
- School of Information Science and Engineering, Shandong University, 250100, Jinan, China
| | - Zhiqiang Fan
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Xiangwei Jiang
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, 410082, Changsha, China
| | - Yeliang Wang
- Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China.
- School of Information and Electronics, MIIT Key Laboratory for Low-Dimensional Quantum Structure and Devices, Beijing Institute of Technology, 100081, Beijing, China.
| | - Ling Li
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China.
| | - Hong-Jun Gao
- Institute of Physics, Chinese Academy of Sciences, 100190, Beijing, China
| | - Xiangfeng Duan
- Department of Chemistry and Biochemistry and California Nanosystems Institute, University of California, Los Angeles, CA, 90095, USA.
| | - Ming Liu
- Key Laboratory of Microelectronic Devices & Integrated Technology, Institute of Microelectronics, Chinese Academy of Sciences, 100029, Beijing, China.
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12
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Yuan Y, Yan Z, Miao J, Cai R, Zhang M, Wang Y, Wang L, Dang W, Wang D, Xiang D, Wang Y, Zhang P, Cui Y, Bian X, Ma Q. Autofluorescence of NADH is a new biomarker for sorting and characterizing cancer stem cells in human glioma. Stem Cell Res Ther 2019; 10:330. [PMID: 31747975 PMCID: PMC6865050 DOI: 10.1186/s13287-019-1467-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 10/14/2019] [Accepted: 10/22/2019] [Indexed: 02/07/2023] Open
Abstract
Background The existing cell surface markers used for sorting glioma stem cells (GSCs) have obvious limitations, such as vulnerability to the enzymatic digestion and time-consuming labeling procedure. Reduced nicotinamide adenine dinucleotide (NADH) as a cellular metabolite with property of autofluorescence has the potential to be used as a new biomarker for sorting GSCs. Methods A method for sorting GSCs was established according to the properties of the autofluorescence of NADH. Then, the NADHhigh and NADHlow subpopulations were sorted. The stem-like properties of the subpopulations were evaluated by qRT-PCR, western blot analyses, limiting dilution assay, cell viability assay, bioluminescence imaging, and immunofluorescence analysis in vitro and in vivo. The relationship between CD133+/CD15+ cells and NADHhigh subpopulation was also assessed. Results NADHhigh cells expressed higher stem-related genes, formed more tumor spheres, and harbored stronger pluripotency in vitro and higher tumorigenicity in vivo, compared to NADHlow subpopulation. NADHhigh glioma cells had the similar stemness with CD133+ or CD15+ GSCs, but the three subpopulations less overlaid each other. Also, NADHhigh glioma cells were more invasive and more resistant to chemotherapeutic drug temozolomide (TMZ) than NADHlow cells. In addition, the autofluorescence of NADH might be an appropriate marker to sort cancer stem cells (CSCs) in other cancer types, such as breast and colon cancer. Conclusion Our findings demonstrate that intracellular autofluorescence of NADH is a non-labeling, sensitive maker for isolating GSCs, even for other CSCs.
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Affiliation(s)
- Ye Yuan
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Zexuan Yan
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Jingya Miao
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Ruili Cai
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Mengsi Zhang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Yanxia Wang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Lihong Wang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Weiqi Dang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Di Wang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Dongfang Xiang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Yan Wang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Peng Zhang
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China
| | - Youhong Cui
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China.
| | - Xiuwu Bian
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China.
| | - Qinghua Ma
- Institute of Pathology and Southwest Cancer Center, Key Laboratory of the Ministry of Education, Southwest Hospital, Third Military Medical University (Army Medical University), Chongqing, 400038, China.
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13
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Dang W, Ma JT, Chen H, Yuan F, Ma XM, Zhan J. [Analysis of infection status and recombination types of norovirus in patients with acute gastroenteritis in the Ningxia Hui Autonomous Region from 2016 to 2017]. Zhonghua Yu Fang Yi Xue Za Zhi 2019; 53:811-816. [PMID: 31378041 DOI: 10.3760/cma.j.issn.0253-9624.2019.08.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To analyze the infection status and recombination of Norovirus in patients with acute gastroenteritis in Ningxia. Methods: The specimens of 10 sentinel hospitals in Ningxia were collected from 2016 to 2017. Real-time quantitative PCR was used for nucleic acid detection. GⅡ-positive samples were amplified by RT-PCR for the RdRp and Capsid regions, then sequenced and genotyped. Evolution analysis was performed using software such as MEGA-X, and recombination analysis was performed using Simplot 3.5.1 and RDP4. Results: The age of the 2 334 cases was 1.42 (0.68, 7.69) years old, 1 133 cases in 2016 and 1 201 cases in 2017, 1 343 and 991 cases for males and females respectively. The positive rate of Norovirus GⅠ genogroup was 0.86% (20/2 334), and GⅡ genogroup was 14.82% (346/2 334). A total of 78 recombinant strains were sequenced and 12 recombinant types were found. GⅡ.Pe/GⅡ.4Sydney_2012 and GⅡ.P12/GⅡ.3 were the main epidemic strains, accounting for 35.90% (28 strains) and 32.05% (25 strain) respectively, followed by GⅡ.P16/GⅡ.2 accounting for 12.82% (10 strains). Among them,GⅡ.P7/GⅡ.6 (2 strains), GⅡ.P12/GⅡ.3 (6 strains), GⅡ.P16/GⅡ.1 (2 strains), GⅡ.P16/GⅡ.2 (5 strains), GⅡ.Pe/GⅡ.4 (7 strains) were detected for the first time in Ningxia. Recombinant strains were all intergenotype recombination, and the recombination breakpionts were all located within ORF1. Conclusion: Norovirus infection in Ningxia area was mainly in GⅡ genogroup from 2016 to 2017, and most of them were recombinant strains. GⅡ.Pe/GⅡ.4Sydney_2012 and GⅡ.P12/GⅡ.3 were the main epidemic strains, followed by GⅡ.P16/GⅡ. 2.
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Affiliation(s)
- W Dang
- School of Public Health and Management of Ningxia Medical University, Yinchuan 750004, China
| | - J T Ma
- School of Public Health and Management of Ningxia Medical University, Yinchuan 750004, China
| | - H Chen
- School of Public Health and Management of Ningxia Medical University, Yinchuan 750004, China
| | - F Yuan
- School of Public Health and Management of Ningxia Medical University, Yinchuan 750004, China
| | - X M Ma
- School of Public Health and Management of Ningxia Medical University, Yinchuan 750004, China
| | - J Zhan
- Viral Department, Ningxia Center for Disease Control and Prevention, Yinchuan 750004, China
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14
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Dang W, Shang S, Zhang X, Yu Y, Irwin DM, Wang Z, Zhang S. A novel 13-plex STR typing system for individual identification and parentage testing of donkeys (Equus asinus). Equine Vet J 2019; 52:290-297. [PMID: 31398262 DOI: 10.1111/evj.13158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 04/24/2019] [Accepted: 07/27/2019] [Indexed: 11/28/2022]
Abstract
BACKGROUND Previous studies investigating donkey parentage and genetic diversity used horse-specific multiplex systems. However, several mis-allele and null-allele issues were found with some of the horse primers when used in donkeys. In 2017, the International Society for Animal Genetics (ISAG) recommended 13 dinucleotide short tandem repeats (STRs) (AHT4, ASB23, HMS2, HMS3, HMS6, HMS7, HMS18, HTG7, HTG10, TKY297, TKY312, TKY337 and TKY343) as a core panel that should be used to identify individuals and to test for parentage in donkeys. To date, no single multiplex STR typing system containing all 13 donkey STRs recommended by the ISAG has been reported. OBJECTIVES To establish a novel and donkey-specific multiplex STR typing system containing all 13 recommended STRs. STUDY DESIGN Assay development and validation in field population. METHODS Primers for seven of the STRs were redesigned and conditions for polymerase chain reaction (PCR) were optimised. We analysed the allele sequences, sensitivity, species-specificity and stutter ratios of this new system. RESULTS A 13-plex STR typing system for donkey was established. A full profile could be generated from a single PCR reaction using as little as 5 ng of DNA template with the 13 pairs of primers labelled with fluorescent dyes. An allele ladder, containing 101 alleles from the 13 STRs, was generated. No full genotype profile was generated with these primers if DNA from humans, or 11 other commonly encountered animals, was used. Genotypes could be generated for the horse and horse-donkey hybrids (mule and hinny). Stutter ratios and population genetic parameters were calculated based on samples from 150 donkeys. The combined probabilities of paternity exclusion for this system were 0.988907326 (CPEduo) and 0.999665018 (CPEtrio). MAIN LIMITATIONS This system cannot detect sex. CONCLUSIONS Our results indicate that our donkey-specific 13-plex STR typing system is sensitive, species-specific and robust for individual identification, paternity testing and population genetic analysis in donkeys, and has potential forensic applications.
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Affiliation(s)
- W Dang
- Institute of Equine Sciences, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, China
| | - S Shang
- Institute of Equine Sciences, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, China
| | - X Zhang
- Liaoning Province Engineering Center of Modern Agricultural Production Base, Shenyang, China
| | - Y Yu
- Institute of Equine Sciences, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, China
| | - D M Irwin
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Z Wang
- Institute of Equine Sciences, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, China
| | - S Zhang
- Institute of Equine Sciences, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang, China
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15
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Shang S, Zhang M, Zhao Y, Dang W, Hua P, Zhang S, Wang Z. Development and validation of a novel 13‐plex
PCR
system for commonly used short tandem repeats in horses (
Equus caballus
). Equine Vet J 2018; 51:688-695. [DOI: 10.1111/evj.13047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Accepted: 11/13/2018] [Indexed: 11/30/2022]
Affiliation(s)
- S. Shang
- Institute of Equine Sciences College of Animal Science and Veterinary Medicine Shenyang Agricultural University Shenyang PR China
- College of Food Science Shenyang Agricultural University Shenyang PR China
| | - M. Zhang
- College of Economics and Management Shenyang Agricultural University Shenyang PR China
| | - Y. Zhao
- Institute of Equine Sciences College of Animal Science and Veterinary Medicine Shenyang Agricultural University Shenyang PR China
| | - W. Dang
- Institute of Equine Sciences College of Animal Science and Veterinary Medicine Shenyang Agricultural University Shenyang PR China
| | - P. Hua
- School of Ecological and Environmental Sciences East China Normal University Shanghai PR China
| | - S. Zhang
- Institute of Equine Sciences College of Animal Science and Veterinary Medicine Shenyang Agricultural University Shenyang PR China
| | - Z. Wang
- Institute of Equine Sciences College of Animal Science and Veterinary Medicine Shenyang Agricultural University Shenyang PR China
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16
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Masterson SP, Zhou N, Akers BK, Dang W, Bickford ME. Ultrastructural and optogenetic dissection of V1 corticotectal terminal synaptic properties. J Comp Neurol 2018; 527:833-842. [PMID: 30255935 DOI: 10.1002/cne.24538] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 05/14/2018] [Revised: 08/27/2018] [Accepted: 09/06/2018] [Indexed: 11/08/2022]
Abstract
The superior colliculus (SC) is a major site of sensorimotor integration in which sensory inputs are processed to initiate appropriate motor responses. Projections from the primary visual cortex (V1) to the SC have been shown to exert a substantial influence on visually induced behavior, including "freezing." However, it is unclear how V1 corticotectal terminals affect SC circuits to mediate these effects. To investigate this, we used anatomical and optogenetic techniques to examine the synaptic properties of V1 corticotectal terminals. Electron microscopy revealed that V1 corticotectal terminals labeled by anterograde transport primarily synapse (93%) on dendrites that do not contain gamma aminobutyric acid (GABA). This preference was confirmed using optogenetic techniques to photoactivate V1 corticotectal terminals in slices of the SC maintained in vitro. In a mouse line in which GABAergic SC interneurons express green fluorescent protein (GFP), few GFP-labeled cells (11%) responded to activation of corticotectal terminals. In contrast, 67% of non-GABAergic cells responded to activation of V1 corticotectal terminals. Biocytin-labeling of recorded neurons revealed that wide-field vertical (WFV) and non-WFV cells were activated by V1 corticotectal inputs. However, WFV cells were activated in the most uniform manner; 85% of these cells responded with excitatory postsynaptic potentials (EPSPs) that maintained stable amplitudes when activated with light trains at 1-20 Hz. In contrast, in the majority of non-WFV cells, the amplitude of evoked EPSPs varied across trials. Our results suggest that V1 corticotectal projections may initiate freezing behavior via uniform activation of the WFV cells, which project to the pulvinar nucleus.
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Affiliation(s)
- S P Masterson
- Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky
| | - N Zhou
- Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky
| | - B K Akers
- Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky
| | - W Dang
- Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky
| | - M E Bickford
- Anatomical Sciences and Neurobiology, University of Louisville, Louisville, Kentucky
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17
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Liu J, Zhong M, Liu X, Sun G, Chen P, Zhang Z, Li J, Ma H, Zhao B, Wu R, Dang W, Yang X, Dai C, Tang X, Fan C, Chen Z, Miao L, Liu X, Liu Y, Li B, Duan X. Two-dimensional plumbum-doped tin diselenide monolayer transistor with high on/off ratio. Nanotechnology 2018; 29:474002. [PMID: 30188325 DOI: 10.1088/1361-6528/aadf5a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Doping can effectively regulate the electrical and optical properties of two-dimensional semiconductors. Here, we present high-quality Pb-doped SnSe2 monolayer exfoliated using a micromechanical cleavage method. X-ray photoelectron spectroscopy measurement demonstrates that Pb content of the doped sample is ∼3.6% and doping induces the downward shift of the Fermi level with respect to the pure SnSe2. Transmission electron microscopy characterization exhibits that Pb0.036Sn0.964Se2 nanosheets have a high-quality hexagonal symmetry structure and Pb element is uniformly distributed in the nanosheets. The current of the SnSe2 field effect transistors (FETs) was found to be very difficult to turn off due to the high electron density. The FETs based on the Pb0.036Sn0.964Se2 monolayer show n-type behavior with a high on/off ratio of 106 which is higher than any values of SnSe2 FETs reported at the moment. The estimated carrier concentration of Pb0.036Sn0.964Se2 is approximately six times lower than that of SnSe2. The results suggest that the method of reducing carrier concentration by doping to achieve high on/off ratio is effective, and Pb-doped SnSe2 monolayer has significant potential in future nanoelectronic and optoelectronic applications.
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Affiliation(s)
- Junchi Liu
- Department of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, People's Republic of China
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Zhao B, Dang W, Liu Y, Li B, Li J, Luo J, Zhang Z, Wu R, Ma H, Sun G, Huang Y, Duan X, Duan X. Synthetic Control of Two-Dimensional NiTe2 Single Crystals with Highly Uniform Thickness Distributions. J Am Chem Soc 2018; 140:14217-14223. [DOI: 10.1021/jacs.8b08124] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bei Zhao
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Weiqi Dang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yuan Liu
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Bo Li
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
- School of Physics and Electronics, Hunan University, Changsha 410082, China
| | - Jia Li
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Jun Luo
- Center for Electron Microscopy Institute for New Energy Materials and Low-Carbon Technologies School of Materials, Tianjin University of Technology, Tianjin 300384, China
| | - Zhengwei Zhang
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Ruixia Wu
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Huifang Ma
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Guangzhuang Sun
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yu Huang
- Department of Materials Science Engineering, University of California, Los Angeles, Los Angeles, California 90095, United States
| | - Xidong Duan
- Hunan Key Laboratory of Two-Dimensional Materials, State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Xiangfeng Duan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States
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Sharifabadi AD, Korevaar DA, McGrath TA, van Es N, Frank RA, Cherpak L, Dang W, Salameh JP, Nguyen F, Stanley C, McInnes MDF. Reporting bias in imaging: higher accuracy is linked to faster publication. Eur Radiol 2018; 28:3632-3639. [PMID: 29564596 DOI: 10.1007/s00330-018-5354-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 10/25/2017] [Revised: 12/28/2017] [Accepted: 01/24/2018] [Indexed: 12/12/2022]
Abstract
OBJECTIVES The objective of this study was to evaluate whether higher reported accuracy estimates are associated with shorter time to publication among imaging diagnostic accuracy studies. METHODS We included primary imaging diagnostic accuracy studies, included in meta-analyses from systematic reviews published in 2015. For each primary study, we extracted accuracy estimates, participant recruitment periods and publication dates. Our primary outcome was the association between Youden's index (sensitivity + specificity - 1, a single measure of diagnostic accuracy) and time to publication. RESULTS We included 55 systematic reviews and 781 primary studies. Study completion dates were missing for 238 (30%) studies. The median time from completion to publication in the remaining 543 studies was 20 months (IQR 14-29). Youden's index was negatively correlated with time from completion to publication (rho = -0.11, p = 0.009). This association remained significant in multivariable Cox regression analyses after adjusting for seven study characteristics: hazard ratio of publication was 1.09 (95% CI 1.03-1.16, p = 0.004) per unit increase for logit-transformed estimates of Youden's index. When dichotomizing Youden's index by a median split, time from completion to publication was 20 months (IQR 13-33) for studies with a Youden's index below the median, and 19 months (14-27) for studies with a Youden's index above the median (p = 0.104). CONCLUSION Imaging diagnostic accuracy studies with higher accuracy estimates were weakly associated with a shorter time to publication. KEY POINTS • Higher accuracy estimates are weakly associated with shorter time to publication. • Lag in time to publication remained significant in multivariate Cox regression analyses. • No correlation between accuracy and time from submission to publication was identified.
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Affiliation(s)
| | - D A Korevaar
- Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Academic Medical Center, Amsterdam, The Netherlands
| | - T A McGrath
- Department of Radiology-Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - N van Es
- Department of Vascular Medicine, Academic Medical Center, Room F4-139, Meibergdreef 9, 1105, AZ, Amsterdam, The Netherlands
| | - R A Frank
- Department of Radiology-Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - L Cherpak
- Department of Radiology-Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - W Dang
- Department of Radiology-Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - J P Salameh
- School of Epidemiology and Public Health, University of Ottawa, Ottawa, ON, Canada
| | - F Nguyen
- Department of Radiology-Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - C Stanley
- Dalhousie University, Halifax, NS, Canada
| | - M D F McInnes
- Department of Radiology, Clinical Epidemiology Program, Ottawa Hospital Research Institute, University of Ottawa, Room c159 Ottawa Hospital Civic Campus, 1053 Carling Ave., Ottawa, ON, K1Y 4E9, Canada.
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Cao H, Huang Y, Wang L, Wang H, Pang X, Li K, Dang W, Tang H, Wei L, Su M, Tang C, Chen T. Leptin promotes migration and invasion of breast cancer cells by stimulating IL-8 production in M2 macrophages. Oncotarget 2018; 7:65441-65453. [PMID: 27588409 PMCID: PMC5323167 DOI: 10.18632/oncotarget.11761] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 08/13/2016] [Indexed: 02/02/2023] Open
Abstract
This study aims to investigate the mechanisms underlying leptin-mediated crosstalk between tumor-associated macrophages (M2 macrophages) and breast cancer cells. THP1 human leukemic monocytes were induced to differentiate into M2 macrophages by PMA (100 nM) and IL-4 (20 ng/mL). Quantitative RT-PCR and Western blot revealed that leptin (100 nM) significantly increased the expression of leptin receptor (ObR) in the M2 macrophages (P < 0.01) and stimulated interleukin (IL)-8 expression in the M2 macrophages, mouse macrophage cells RAW264.7, and primary mouse peritoneal macrophages in a dose- and time-dependent manner. Leptin-induced IL-8 production was sensitive to the ERK inhibitor PD980590 (10 μmol/L), p38 MAPK inhibitor SB203580 (20 μmol/L), and anti-ObR neutralizing antibody (4 μg/mL). Leptin (100 ng/mL) substantially increased the phosphorylation of p38 and ERK1/2. Thus, leptin may induce IL-8 production in M2 macrophages by interacting with ObR to activate the p38 and ERK signaling pathways. Scratch and transwell chamber assay showed that both recombinant IL-8 and leptin-induced M2 macrophage-derived IL-8 promoted the migration and invasion of human breast cancer cells MCF7 and MDA-MB-231 (All P < 0.01). In a nude mice xenograft model of breast cancer (n = 5 per group), injection of leptin (0.1 μg/g) dramatically increased tumor volume and mass, reduced survival, exacerbated pulmonary metastasis, and elevated IL-8 and Ki67 expression in the tumor tissue (All P < 0.05) compared with PBS injection. Depletion of mouse macrophage by Clophosome®-clodronate liposome and injection of anti-mouse IL-8 neutralizing antibodies in the xenograft tumor significantly attenuated those leptin-mediated stimulations (All P < 0.05). These findings indicate that leptin may promote tumor growth and metastasis by stimulating IL-8 production in tumor-associated macrophage.
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Affiliation(s)
- Hong Cao
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Yunxiu Huang
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Lin Wang
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Hong Wang
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Xueli Pang
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Kuangfa Li
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Weiqi Dang
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Hao Tang
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Lan Wei
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Min Su
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Cuiping Tang
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
| | - Tingmei Chen
- Department of Laboratory Medicine Key Laboratory of Diagnostic Medicine, Ministry of Education Chongqing Medical University, Chongqing, China
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Dang W. H3K36ME3 PROMOTES LONGEVITY BY SUPPRESSING AGE-ASSOCIATED INTRAGENIC CRYPTIC TRANSCRIPTION. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- W. Dang
- Huffington Center on Aging, Baylor College of Medicine, Houston, Texas
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Su Q, Liu H, Yuan X, Zhang X, Dang W, Zhang J, Qin Y, Men B, Zhao X, Xiao Y, Sun R. Retraction Note to: The Interaction Effects of Temperature and Humidity on Emergency Room Visits for Respiratory Diseases in Beijing, China. Cell Biochem Biophys 2017; 76:327. [PMID: 28526909 DOI: 10.1007/s12013-017-0803-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- Q Su
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - H Liu
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - X Yuan
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - X Zhang
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - W Dang
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - J Zhang
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - Y Qin
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - B Men
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - X Zhao
- Emergency Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China.
| | - Y Xiao
- Respiratory Department, The First Affiliated Hospital of General Hospital of PLA, Beijing, People's Republic of China
| | - R Sun
- Emergency Department, The General Hospital of PLA, Beijing, People's Republic of China
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Lopez P, Aguilar T, Wu R, Krishnan A, Kong D, Patel J, Javier H, Dang W, Wong D, Zhu D, Dodd J, Shad Y, Humayun M, Hinton D, Clegg D, Johnson L, Lin C, Hsu D, Couture L. 445. cGMP Compliant Production for Human Embryonic Stem Cell Derived Retinal Pigment Epithelial Cells on a Synthetic Substrate for the Treatment of Non-Neovascular Age-Related Macular Degeneration for Phase I Clinical Study. Mol Ther 2016. [DOI: 10.1016/s1525-0016(16)33254-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Yogeswaran N, Dang W, Navaraj W, Shakthivel D, Khan S, Polat E, Gupta S, Heidari H, Kaboli M, Lorenzelli L, Cheng G, Dahiya R. New materials and advances in making electronic skin for interactive robots. Adv Robot 2015. [DOI: 10.1080/01691864.2015.1095653] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Dang W, Tang H, Cao H, Wang L, Zhang X, Tian W, Pang X, Li K, Chen T. Strategy of STAT3β cell-specific expression in macrophages exhibits antitumor effects on mouse breast cancer. Gene Ther 2015; 22:977-83. [PMID: 26181625 DOI: 10.1038/gt.2015.70] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 04/27/2015] [Accepted: 06/18/2015] [Indexed: 01/05/2023]
Abstract
Recent studies underscore the importance of crosstalk between tumor-associated macrophages (TAMs) and tumor cells in cancer progression and metastasis. In our study, AdCD68STAT3β, a recombinant adenovirus containing a STAT3β gene driven by CD68 macrophage-specific promoter, was used to suppress STAT3 and the downstream signaling pathways in TAMs. The results showed that STAT3β gene under the control of CD68 macrophage-specific promoter was only expressed in macrophages, which significantly inhibited the motility and invasion of breast cancer cells when co-cultured with 4T1 cells. Moreover, cell-specific STAT3β expression in TAMs extended survival of tumor-bearing mice and suppressed breast tumor growth, angiogenesis and metastasis, by regulating the crosstalk between tumor cells and TAMs. Therefore, our study provided a novel strategy for the antitumor effects of STAT3β.
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Affiliation(s)
- W Dang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - H Tang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - H Cao
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - L Wang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - X Zhang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - W Tian
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - X Pang
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - K Li
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
| | - T Chen
- Key Laboratory of Diagnostic Medicine Designated by the Ministry of Education, Chongqing Medical University, Chongqing, China
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Wang L, Tang C, Cao H, Li K, Pang X, Zhong L, Dang W, Tang H, Huang Y, Wei L, Su M, Chen T. Activation of IL-8 via PI3K/Akt-dependent pathway is involved in leptin-mediated epithelial-mesenchymal transition in human breast cancer cells. Cancer Biol Ther 2015; 16:1220-30. [PMID: 26121010 DOI: 10.1080/15384047.2015.1056409] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [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: 12/12/2022] Open
Abstract
BACKGROUND INFORMATION Previous studies have revealed that leptin may be involved in epithelial-mesenchymal transition (EMT), a crucial initiator of cancer progression to facilitate metastatic cascade, increase tumor recurrence, and ultimately cause poor prognosis. However, the underlying mechanism remains unclear. The aim of our present study was to investigate the effect of leptin on EMT of breast cancer cells and the underlying mechanism. RESULTS Our data demonstrated that leptin significantly increased the phosphorylation of STAT3, Akt, and ERK1/2, elevated the expression of IL-8, and induced breast cancer cells to undergo EMT. The effect of leptin on IL-8 could visibly abolished by the inhibitor of PI3K LY294002. In addition, leptin-induced EMT of breast cancer cells was blocked by anti-IL-8 antibodies. Examination of the expression of ObR, leptin, IL-8 and EMT-related biomarkers in patient specimens demonstrated that malignant breast carcinoma with lymph node metastases (LNM), which represents poor prognosis, expressed higher levels of ObR, leptin, IL-8 than other types of breast cancer, and displayed more obvious EMT transversion. In vivo xenograft experiment revealed that leptin signally promoted tumor growth and metastasis and increased the expressions of IL-8 and EMT-related biomarkers. CONCLUSIONS Our results support that leptin-induced EMT in breast cancer cells requires IL-8 activation via the PI3K/Akt signal pathway.
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Key Words
- AKT, Protein Kinase B
- COX-2, cyclooxygenase-2
- EMT
- EMT, epithelial-mesenchymal transition
- ERK, extracellular signal-regulated kinase
- IFN, interferon
- IL-8
- IL-8, Interleukin 8
- JAK, Junas Kinase
- LNM, lymph node metastases
- MAPK, Mitogen-activated protein kinase
- MMP, matrix metalloproteinase
- NF-κB, Nuclear factor kappa B
- Ob-R, Ob receptor
- PI-3K, phosphatidylinositol-3 kinase
- PI3K/Akt
- STAT, signal transduction and activators of transcription
- TGF, transforming growth factor
- TNF, tumor necorsis factor
- VEGF, vascular endothelial growth factor
- breast cancer
- leptin
- mTOR, Mammalian Target Of Rapamycin
- qRT-PCR, quantify reverse transcription-polymerase chain reaction
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Affiliation(s)
- Lin Wang
- a Department of Laboratory Medicine ; Key Laboratory of Diagnostic Medicine ; Ministry of Education ; Chongqing Medical University ; Chongqing , China
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Wang L, Cao H, Pang X, Li K, Dang W, Tang H, Chen T. [The effect of leptin and its mechanisms on the migration and invasion of human breast cancer MCF-7 cells]. Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi 2013; 29:1272-1276. [PMID: 24321071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
OBJECTIVE To investigate the effect and the relevant molecular mechanisms of leptin on the migration and invasion of human breast cancer MCF-7 cells. METHODS The expression of OB-R in MCF-7 cells was measured by RT-PCR and Western blotting. The effects of leptin (100 ng/mL) on the the phosphorylation of a few key cell signaling proteins, p-ERK1/2, p-STAT3, p-AKT in MCF-7 cells were examined by Western blotting. Cell scratch assay and Transwell(TM); assay were utilized to measure the effects of leptin on the migration and invasion capability of MCF-7 cells, respectively. The effects of leptin on the mRNA and protein expression of matrix metalloproteinas 9 (MMP-9) and transforming growth factor β (TGF-β) were measured by RT-PCR and Western blotting. RESULTS Both OB-Rb and OB-Rt were expressed in MCF-7 cells. This indicated that leptin may have significant activities in MCF7 cells. Indeed, leptin increased the phosphorylation of p-ERK1/2, p-STAT3, and p-AKT in MCF-7 cells (P < 0.05). Further, leptin promoted migration and invasion of MCF-7 cells, which were attenuated by the JAK/STAT inhibitor AG490 (50 μmol/L), and the PI3K/AKT inhibitor LY294002 (10 μmol/L) (P < 0.05). Similarly, leptin also increased the mRNA and protein expression of MMP-9 and TGF-β, and these effects were blocked by AG490 and LY294002 as well (P < 0.05). CONCLUSION Leptin promoted the migration and invasion capabilities of MCF-7 cells. These activities may be achieved by the upregulation of MMP-9 and TGF-β through JAK/STAT and PI3K/AKT signaling pathways.
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Affiliation(s)
- Lin Wang
- Key Laboratory of Laboratory Medical Diagnostics, Ministry of Eduction, Chongqing Medical University, Chongqing 400016, China
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Su N, Zhang L, Fei F, Hu H, Wang K, Hui H, Jiang XF, Li X, Zhen HN, Li J, Cao BP, Dang W, Qu Y, Zhou F. The brain-derived neurotrophic factor is associated with alcohol dependence-related depression and antidepressant response. Brain Res 2011; 1415:119-26. [PMID: 21880305 DOI: 10.1016/j.brainres.2011.08.005] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 07/14/2011] [Accepted: 08/03/2011] [Indexed: 11/30/2022]
Abstract
Brain-derived neurotrophic factor (BDNF) plays an essential role in neuronal survival, proliferation, and synaptic remodeling and modulates the function of many other neurotransmitters. Additionally, it likely underlies neurodegenerative and psychiatric disorders, including alcohol dependence-related depression (AD-D). Here, we investigated the possible association between three single nucleotide polymorphisms (SNPs) of the BDNF gene (rs13306221, rs6265, rs16917204) and AD-D. Of 548 patients with alcohol dependence (AD), 166 had AD-D and 312 healthy controls. Response to 8-week sertraline treatment was also assessed. The frequency of the A allele of rs6265 (Val66Met) was significantly higher in AD-D patients than in the healthy controls (p=0.009 after Bonferroni correction). The analysis revealed a strong association between the rs6265 genotype distribution and AD-D (p=0.005 after Bonferroni correction), and the A allele of rs6265 was significantly overrepresented in AD-D patients compared to AD without depression (AD-nD) patients (p=0.001 after Bonferroni correction). Additionally, carriers of the A allele of rs6265 responded better to sertraline treatment (p=0.001). Our results suggested a novel association between BDNF rs6265 and AD-D. These findings might lead to earlier detection of AD-D, perhaps providing better tools for clinical care of these patients in the future.
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Affiliation(s)
- N Su
- Department of Neurosurgery, Xi Jing Hospital, Fourth Military Medical University, Xi'an, Shannxi, PR China.
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Ausubel LJ, Meseck M, Derecho I, Lopez P, Knoblauch C, McMahon R, Anderson J, Dunphy N, Quezada V, Khan R, Huang P, Dang W, Luo M, Hsu D, Woo SLC, Couture L. Current good manufacturing practice production of an oncolytic recombinant vesicular stomatitis viral vector for cancer treatment. Hum Gene Ther 2011; 22:489-97. [PMID: 21083425 DOI: 10.1089/hum.2010.159] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Vesicular stomatitis virus (VSV) is an oncolytic virus currently being investigated as a promising tool to treat cancer because of its ability to selectively replicate in cancer cells. To enhance the oncolytic property of the nonpathologic laboratory strain of VSV, we generated a recombinant vector [rVSV(MΔ51)-M3] expressing murine gammaherpesvirus M3, a secreted viral chemokine-binding protein that binds to a broad range of mammalian chemokines with high affinity. As previously reported, when rVSV(MΔ51)-M3 was used in an orthotopic model of hepatocellular carcinoma (HCC) in rats, it suppressed inflammatory cell migration to the virus-infected tumor site, which allowed for enhanced intratumoral virus replication leading to increased tumor necrosis and substantially prolonged survival. These encouraging results led to the development of this vector for clinical translation in patients with HCC. However, a scalable current Good Manufacturing Practice (cGMP)-compliant manufacturing process has not been described for this vector. To produce the quantities of high-titer virus required for clinical trials, a process that is amenable to GMP manufacturing and scale-up was developed. We describe here a large-scale (50-liter) vector production process capable of achieving crude titers on the order of 10(9) plaque-forming units (PFU)/ml under cGMP. This process was used to generate a master virus seed stock and a clinical lot of the clinical trial agent under cGMP with an infectious viral titer of approximately 2 × 10(10) PFU/ml (total yield, 1 × 10(13) PFU). The lot has passed all U.S. Food and Drug Administration-mandated release testing and will be used in a phase 1 clinical translational trial in patients with advanced HCC.
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Affiliation(s)
- L J Ausubel
- Center for Biomedicine and Genetics, and Center for Applied Technology Development, Beckman Research Institute of City of Hope, Duarte, CA 91010, USA.
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Abstract
AIM To investigate the effect of copper on the virulence of Edwardsiella tarda. METHODS AND RESULTS The pathogenic Edw. tarda strain TX5 was cultured under copper-stressed conditions and examined for any potential alteration in capacities that are associated with pathogenicity. The results showed that compared to untreated TX5, Cu-treated TX5 exhibits reduced planktonic and biofilm growth, an impaired ability to adhere to host mucus, modulation of host immune response, and dissemination in host blood and liver. Consistent with these observations, the overall bacterial virulence of Cu-treated TX5 is significantly attenuated. SDS-PAGE analyses of whole cell protein production showed that Cu-treated TX5 differs from the untreated TX5 in its production of at least one protein. Quantitative real time reverse transcriptase PCR analyses showed that copper treatment decreased the expression of virulence-associated genes encoding components of the type III and type VI secretion systems, the Eth haemolysin system, and the LuxS/AI-2 quorum-sensing system. CONCLUSIONS Prolonged exposure to copper has multiple effects on TX5 and results in significant attenuation of bacterial virulence. SIGNIFICANCE AND IMPACT OF THE STUDY The results of this study demonstrate that copper treatment has a broad and profound effect on the virulence-associated capacities of TX5, which is exerted at least in part at the transcription level. These findings provide new insights to the antimicrobial mechanism of copper.
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Affiliation(s)
- Y-H Hu
- Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China
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Zhukovsky E, Chu S, Bernett M, Karki S, Dang W, Hammond P, Edler C, Polder N, Chan C, Jacinto J, Desjarlais J. XmAb Fc engineered anti-CD19 monoclonal antibodies with enhanced in vitro efficacy against multiple lymphoma cell lines. J Clin Oncol 2007. [DOI: 10.1200/jco.2007.25.18_suppl.3021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
3021 Background: CD19 is a pan-B cell surface receptor that is expressed from early stages of pre-B cell development through terminal differentiation into plasma cells. It is an attractive immunotherapy target for cancers of lymphoid origin since it is also expressed on the vast majority of Non-Hodgkin Lymphoma (NHL) cells as well as some leukemias. Despite major improvements in response rates and progression free survival the majority of NHL patients will relapse under the current combination chemotherapy with anti-CD20. Thus salvage regimens with new non-cross resistant antibody therapies are warranted. Methods: We employ our XmAb antibody engineering technology to increase the affinity of IgG antibodies for Fc gamma receptors (FcγR), improve the effector function of antibodies, and significantly increases their antitumor potency; we also we humanize and affinity mature such antibodies. Results: The XmAb technology was applied to a humanized anti-CD19 antibody to engineer a variant with significantly enhanced (10- to 100-fold) antibody-dependent cell-mediated cytotoxicity (ADCC). The resulting XmAb CD19 variant was assayed for ADCC against multiple cell lines representative of follicular lymphoma (FL), chronic lymphocytic leukemia (CLL), B-cell acute lymphoblastic leukemia (B-ALL), mantle cell lymphoma (MCL), hairy cell leukemia (HCL), chronic myelogenous leukemia (CML), and Burkitt’s lymphoma (BL). The ADCC activity of the XmAb CD19 was in striking contrast to a wild type IgG1 version of the antibody that mediates little ADCC. Moreover, ADCC potency and efficacy of the anti-CD19 Fc variant antibody were superior to that of rituximab: CLL - 10- and 1.5-fold higher, ALL - 10- and 100-fold higher, and HCL - 6- and 1.2-fold higher, respectively. Further, we observed no correlation between ADCC and antigen expression based on the measured cell surface density of CD19 for these cell lines. Conclusions: The increased affinity for FcγRs exhibited by the anti-CD19 Fc variant antibody overcomes much of the dependence of cytotoxicity on surface antigen density. Our data suggest that the anti-CD19 Fc variant antibody engineered for increased effector function could be a promising next-generation NHL immunotherapeutic. No significant financial relationships to disclose.
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Vafa O, Kharki S, Vielmetter J, Chamberlain A, Hammond P, Dang W, Carmichael D, Kunkel L, Barbosa M, Desjarlais J. Anti-EpCAM XmAb antibodies with improved cytotoxicity. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.12506] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
12506 Background: The epithelial cell adhesion molecule (EpCAM), also known as epithelial protein 2 (EGP-2) or 17–1A antigen, is a trans-membrane protein expressed on the surfaces of most carcinomas, including those of pancreatic, colorectal, prostate, breast, kidney, lung, and ovarian origins. Moderate affinity antibodies (Abs) such as 17–1A (Kd ∼ 10−7 nM) have been safe in humans albeit with limited clinical efficacy. Attempts to improve clinical efficacy by enhancing antigen affinity (Kd ∼ 10−9 nM) have led to serious clinical toxicity, including pancreatitis. These observations raise the question of whether a moderate affinity Ab with enhanced effector function will be both safe and clinically efficacious. Methods: We applied our proprietary XmAb™ technologies to humanize the 17–1A variable domain and engineer a human IgG1 Fc domain to increase affinity for the activating receptor FcγRIIIa. Ab binding to Ep-CAM or to Fc receptors was tested with Biacore and/or AlphaScreen binding assays. In vitro cytotoxic activity against representative cancer cell lines was measured with Antibody Dependent Cell-mediated Cytotoxicity (ADCC) assays, using human PBMC as effector cells. Results: Humanized anti-EpCAM Abs have affinity for EpCAM similar to the parent 17–1A. Affinity for the activating FcγRIIIa was increased 100-fold relative to a control Ab with an IgG1 Fc domain. As expected, these Abs exhibit dramatically enhanced ADCC against multiple cancer cell lines relative to 17–1A and IgG1 control Abs. Despite their moderate affinity for EpCAM, these novel Abs have in vitro cytotoxicity comparable to the high affinity Ab ING-1. CDC activities of these Abs were similar to chimeric 17–1A. Conclusions: We have demonstrated that antibodies with moderate affinity for EpCAM and increased FcγRIIIa affinity exhibit superior cancer cell killing via an ADCC mechanism. The humanized nature and the increased cytotoxicity of anti-EpCAM XmAb™ antibodies make them promising candidates for clinical development of a novel pan-carcinoma Ab that is superior to 17–1A. [Table: see text]
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Carmichael DF, Desjarlais JR, Lazar GA, Dang W, Vafa O, Vielmetter J, Karki S, Dahiyat B. Engineering antibodies to enhance efector functions. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.2551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Affiliation(s)
- B S Nikolajczyk
- Rosenstiel Research Center and Department of Biology, Brandeis University, Waltham, Massachusetts 02454
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Harper E, Dang W, Lapidus RG, Garver RI. Enhanced efficacy of a novel controlled release paclitaxel formulation (PACLIMER delivery system) for local-regional therapy of lung cancer tumor nodules in mice. Clin Cancer Res 1999; 5:4242-8. [PMID: 10632366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The efficacy of systemic chemotherapy for non-small cell lung cancer (NSCLC) has improved with newer agents. However, the response rates and prolonged survival times achieved by chemotherapy remain modest, and these small gains are obtained at the cost of significant toxicity. In this study, the efficacy of a controlled release formulation of paclitaxel was compared with conventional paclitaxel in animals with human lung cancer xenografts. Paclitaxel (10%) was encapsulated in a proprietary polymer in the form of microspheres (PACLIMER Delivery System). Tumor nodules comprised of two different cell lines (A549 and H1299) were treated by a single i.p. or intratumoral administration of conventionally formulated paclitaxel or a single intratumoral injection of the PACLIMER Delivery System. In vitro testing demonstrated that paclitaxel was released slowly from the microspheres with >80% released after 90 days. Direct comparison of the highest dose for all formulations (24 mg/kg) showed that for nodules comprised of either NSCLC cell line, growth of the PACLIMER Delivery System-treated nodules were inhibited significantly more than the groups treated with conventional paclitaxel or the vehicle controls. Tumor volume doubling times for A549 and H1299 nodules treated with PACLIMER Delivery System were 60 and 35 days, respectively, compared with 10 and 11 days, respectively, in the nodules treated with the conventional paclitaxel by intratumoral administration. We conclude that intratumoral administration of the PACLIMER Delivery System may substantially increase the efficacy of paclitaxel for the therapy of local-regional NSCLC.
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MESH Headings
- Animals
- Antineoplastic Agents, Phytogenic/administration & dosage
- Antineoplastic Agents, Phytogenic/chemistry
- Carcinoma, Non-Small-Cell Lung/drug therapy
- Carcinoma, Non-Small-Cell Lung/pathology
- Delayed-Action Preparations
- Drug Delivery Systems
- Growth Inhibitors/administration & dosage
- Growth Inhibitors/chemistry
- Humans
- Injections, Intralesional
- Injections, Intraperitoneal
- Lung Neoplasms/drug therapy
- Lung Neoplasms/pathology
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- Microspheres
- Neoplasm Transplantation
- Paclitaxel/administration & dosage
- Paclitaxel/chemistry
- Transplantation, Heterologous
- Tumor Cells, Cultured
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Affiliation(s)
- E Harper
- Lung Cancer Program and Division of Pulmonary/Allergy/Critical Care Medicine, University of Alabama at Birmingham, 35294-0007, USA
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Dang W, Nikolajczyk BS, Sen R. Exploring functional redundancy in the immunoglobulin mu heavy-chain gene enhancer. Mol Cell Biol 1998; 18:6870-8. [PMID: 9774700 PMCID: PMC109270 DOI: 10.1128/mcb.18.11.6870] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/1998] [Accepted: 07/22/1998] [Indexed: 11/20/2022] Open
Abstract
Immunoglobulin (Ig) mu heavy-chain gene enhancer activity is mediated by multiple DNA binding proteins. Mutations of several protein binding sites in the enhancer do not affect enhancer activity significantly. This feature, termed redundancy, is thought to be due to functional compensation of the mutated sites by other elements within the enhancer. In this study, we identified the elements that make the basic helix-loop-helix (bHLH) protein binding sites, muE2 and muE3, redundant. The major compensatory element is a binding site for interferon regulatory factors (IRFs) and not one of several other bHLH protein binding sites. These studies also provide the first evidence for a role of IRF proteins in Ig heavy-chain gene expression. In addition, we reconstituted the activity of a monomeric mu enhancer in nonlymphoid cells and defined the domains of the ETS gene required for function.
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Affiliation(s)
- W Dang
- Rosenstiel Research Center and Departments of Biology and Biochemistry, Brandeis University, Waltham, Massachusetts 02254, USA
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37
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Dang W, Yang J. Clinical study on acupuncture treatment of stomach carcinoma pain. J TRADIT CHIN MED 1998; 18:31-8. [PMID: 10437260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Clinical observation on 48 cases of stomach carcinoma pain indicated that acupuncture including filiform needle group and point-injection group had better therapeutic effects in treatment of stomach carcinoma pain when patient's mind was concentrated at the site of disease. After treatment for 2 months, the long-term effective rates of analgesia in both the filiform needle group and the point-injection group were similar to that in the western medicine group, all being about 81%. While the long-term markedly effective rates in the two groups were superior to that in the western medicine group. Life quality of the patients in all the groups were improved. The toxic action and side effects caused by chemotherapy were prevented, the high viscous state showed by indexes of blood rheology was improved, and the lowered Cu-Zu-SOD activity in erythrocytes in patients of stomach carcinoma was increased in the filiform needle group and the point-injection group. Based on the results of clinical study, we consider that acupuncture analgesic effect on stomach carcinoma is related to the increase of PLEK, improvement of cellular immune function and the elevation of life quality after acupuncture.
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Affiliation(s)
- W Dang
- Chengdu College of Traditional Chinese Medicine
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38
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Dang W, Sun XH, Sen R. ETS-mediated cooperation between basic helix-loop-helix motifs of the immunoglobulin mu heavy-chain gene enhancer. Mol Cell Biol 1998; 18:1477-88. [PMID: 9488464 PMCID: PMC108862 DOI: 10.1128/mcb.18.3.1477] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/1997] [Accepted: 11/29/1997] [Indexed: 02/06/2023] Open
Abstract
The muE motifs of the immunoglobulin mu heavy-chain gene enhancer bind ubiquitously expressed proteins of the basic helix-loop-helix (bHLH) family. These elements work together with other, more tissue-restricted elements to produce B-cell-specific enhancer activity by presently undefined combinatorial mechanisms. We found that muE2 contributed to transcription activation in B cells only when the muE3 site was intact, providing the first evidence for functional interactions between bHLH proteins. In vitro assays showed that bHLH zipper proteins binding to muE3 enhanced Ets-1 binding to muA. One of the consequences of this protein-protein interaction was to facilitate binding of a second bHLH protein, E47, to the muE2 site, thereby generating a three-protein-DNA complex. Furthermore, transcriptional synergy between bHLH and bHLH zipper factors also required an intermediate ETS protein, which may bridge the transcription activation domains of the bHLH factors. Our observations define an unusual form of cooperation between bHLH and ETS proteins and suggest mechanisms by which tissue-restricted and ubiquitous factors combine to generate tissue-specific enhancer activity.
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Affiliation(s)
- W Dang
- Department of Biology, Brandeis University, Waltham, Massachusetts 02254-9110, USA
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Abstract
The lymphoid-specific immunoglobulin mu heavy chain gene intron enhancer (muE) contains multiple binding sites for trans-acting nuclear factors. We have used a combination of in vitro and in vivo assays to reconstruct protein-DNA interactions on a minimal B cell-specific mu enhancer that contains three motifs, muA, muB, and muE3. Using ETS-domain proteins that transactivate the minimal enhancer in non-lymphoid cells, we show that (i) PU.1 binds coordinately to both muA and muB sites in vitro and (ii) in the presence of Ets-1, this factor binds to the muA site and PU.1 to the muB site. Two factors, TFE3 and USF, bind to the muE3 element. When the ETS proteins are present together with muE3 binding proteins, a three-protein-DNA complex is generated. Furthermore, we provide evidence for protein-protein interactions between Ets-1 and PU.1 proteins that bind to muA and muB sites, and between Ets-1 and TFE3 bound to the muA and mu3 sites. We propose that this domain of the mu enhancer is assembled into a nucleoprotein complex that contains two tissue-restricted ETS domain proteins that recognize DNA from the same side of the helix and one ubiquitously expressed bHLH-leucine zipper protein that binds between them, recognizing its site from a different side of the helix.
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Affiliation(s)
- E Rao
- Rosenstiel Basic Medical Sciences Research Center and Departments of Biology, Brandeis University, Waltham, Massachusetts 02254-9110, USA
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40
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Dang W, Daviau T, Brem H. Morphological characterization of polyanhydride biodegradable implant gliadel during in vitro and in vivo erosion using scanning electron microscopy. Pharm Res 1996; 13:683-91. [PMID: 8860422 DOI: 10.1023/a:1016035229961] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
PURPOSE The objectives of the current study are to characterize the distribution of the chemotherapeutic agent carmustine (BCNU) in spray dried polyanhydride microspheres and to describe the morphological changes that occur during the in vitro and in vivo erosion of the polyanhydride implant--GLIADEL, which consists of BCNU distributed in the copolymer matrix of poly(carboxyphenoxy propane:sebacic acid) in a 20:80 molar ratio (p(CPP:SA, 20:80)). METHODS Scanning electron microscopy (SEM) was used to visualize the morphological changes of the polymer during the manufacturing process and in vitro and in vivo erosion. RESULTS This study revealed that BCNU was homogeneously distributed within spray dried polyanhydride microspheres with no phase separation. The porosity of the wafer fabricated from spray dried polyanhydride microspheres gradually increased during erosion. During the initial period following wafer implantation in the brains of rats, erosion was mainly confined to the surface layer of the wafer with the majority of the wafer remaining intact. The eroding front gradually advanced from the surface to the interior of the wafer in a layerwise fashion, creating pores and connecting channel. Eventually both the interior and exterior of the wafers were eroded and the same porous structure was seen throughout the whole wafer. CONCLUSIONS This study provides the first visual observation of the morphological changes of the GLIADEL(R) wafer during erosion of the polyanhydride matrix and release of the drug substance BCNU. The observations in this study support the conclusion that BCNU release from a polyanhydride wafer is controlled both by diffusion of the drug and erosion of the polymer matrix.
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Affiliation(s)
- W Dang
- Guilford Pharmaceuticals, Inc., Baltimore, Maryland 21224, USA
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Naini AA, Shimony E, Kozlowski E, Shaikh T, Dang W, Miller C. Interaction of Ca2(+)-activated K+ channels with refolded charybdotoxins mutated at a central interaction residue. Neuropharmacology 1996; 35:915-21. [PMID: 8938722 DOI: 10.1016/0028-3908(96)00112-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Charybdotoxin is a small peptide blocker of K+ channels, rigidly held in active conformation by three disulfide bonds. The toxin blocks K+ channels by binding to a receptor site located at the external "vestibule", and thus physically occluding the outer opening of the K+ conduction pore. In the blocked complex, K27, a residue on the toxin's molecular surface, projects its epsilon-amino group into the K(+)-selective pore. The results here show that CTX, produced by heterologous expression in E. coli, may be manipulated to place unnatural positively charged residues at position 27. The toxin folds faithfully to its native conformation when the crucial lysine at position 27 is replaced by a cysteine residue, a maneuver that allows specific chemical modification of this side-chain. Replacements of K27 by side-chains slightly shorter or slightly longer than lysine yield active toxins. The toxin variant with ornithine at this position interacts much less strongly with K+ ions in the pore of slowpoke-type Ca2(+)-activated K+ channels than does wild-type toxin. This result argues that the epsilon-amino group of K27 in bound toxin lies only a few ångstroms away from a K+ ion occupying the blocked pore. The peptide folds with high efficiency to form the correct disulfides even in the presence of strong denaturants.
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Affiliation(s)
- A A Naini
- Howard Hughes Medical Institute, Graduate Department of Biochemistry, Brandeis University, Waltham, Massachusetts, USA
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Abstract
Polymeric matrices that slowly release macromolecules may be useful for the controlled delivery of proteins or polymer-drug conjugates for targeted drug delivery. Solid particles of fluorescein and fluorescently-labeled, size-fractionated dextran (4000-150,000 number average molecular weight) were dispersed in degradable polyanhydride matrices composed of a 1:1 copolymer of fatty acid dimers and sebacic acid. The release of macromolecules from the polymer matrix into buffered saline was measured; changes in the polymer during immersion were monitored by infrared spectroscopy, differential scanning calorimetry, and scanning electron microscopy. Although significant hydrolysis of the polymer occurred within the first day, the matrices remained intact and water-soluble tracers were slowly released for several days. During polymer hydrolysis and erosion, micron-sized pores developed throughout the 2 mm thick polymer matrix, permitting water penetration into the matrix and tracer diffusion out of the matrix. The rate of tracer release from the matrix depended on tracer particle size; rates of fluorescein isothiocyanate dextran release were controlled by adjusting the size of particles dispersed in the matrix.
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Affiliation(s)
- W Dang
- Department of Chemical Engineering, Johns Hopkins University, Baltimore, MD 21218
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Simón C, Tsafriri A, Chun SY, Piquette GN, Dang W, Polan ML. Interleukin-1 receptor antagonist suppresses human chorionic gonadotropin-induced ovulation in the rat. Biol Reprod 1994; 51:662-7. [PMID: 7819447 DOI: 10.1095/biolreprod51.4.662] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Indirect evidence has implicated the interleukin-1 (IL-1) system in ovulation. Thus, the ability of IL-1 beta to induce ovulation in rat and rabbit perfused ovaries has been demonstrated. In the present study, the involvement of the IL-1 system in ovulation was directly tested in vivo, in the rat model. For this purpose, the natural inhibitor of the IL-1 system, interleukin-1 receptor antagonist (IL-1ra), was administered locally by use of an intrabursal injection route. Twenty-six-day-old Sprague-Dawley rats received injections of eCG (10 IU), followed 56 h later by hCG (15 IU). IL-1ra (75 micrograms/bursa) was administered locally into the periovarian sac, 6 h (n = 5), 2 h (n = 11), and 0 h (n = 5) before hCG administration. Control animals (n = 10) received injections of the same volume (50 microliters) of vehicle (PBS). IL-1ra administered locally into the periovarian sac inhibited ovulation from the treated ovary, reaching 40% inhibition (p < 0.05) when injected 2 h prior to hCG, as compared to the untreated contralateral ovary (6 +/- 1.4 ova vs. 10 +/- 1.8 ova) and PBS-injected control ovaries (6 +/- 1.4 ova vs. 8.2 +/- 0.7). Injection of IL-1ra 6 h before or concomitantly with hCG did not affect the ovulation rate. Internucleosomal DNA fragmentation was evaluated by 3' end-labeling and autoradiography for detecting apoptotic changes. No difference in DNA fragmentation was found between treated and untreated ovaries.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- C Simón
- Department of Gynecology and Obstetrics, Stanford University Medical Center, California 94305
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Dang W, Colvin OM, Brem H, Saltzman WM. Covalent coupling of methotrexate to dextran enhances the penetration of cytotoxicity into a tissue-like matrix. Cancer Res 1994; 54:1729-35. [PMID: 7511049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
For antitumor agents introduced directly into the intracranial space, the extent of penetration into tissue, and hence the effectiveness of therapy, depends on the rate of drug elimination from the tissue. To test the hypothesis that slowly eliminated agents would penetrate further through tissues, methotrexate (MTX)-dextran conjugates were produced by covalently linking MTX to dextran through a short-lived ester bond (MTX-ester-dextran; t1/2 approximately 3 days in buffered saline) and a longer-lived amide bond (MTX-amide-dextran; t1/2 > 20 days in buffered saline). The ability of these agents to kill cells and to penetrate through tissue was evaluated using: (a) human brain tumor (H80) cells in a standard format; (b) H80 cells in a novel three-dimensional format that mimics many characteristics of intracranial tumors; and (c) 9L gliosarcoma in the rat brain. Penetration into three-dimensional tissue-like matrices was performed by suspending H80 cells in agarose gels within a hollow fiber that was permeable to MTX but not dextran and injecting MTX or MTX-dextran conjugates into one end of the fiber. The cytotoxicity of MTX-ester-dextran and MTX-amide-dextran against H80 was equivalent to unmodified MTX (50% inhibitory concentration, approximately 0.01 microgram/ml). When released from a biodegradable polyanhydride polymer matrix, MTX and MTX-dextran conjugates retained their ability to inhibit dihydrofolate reductase activity. When MTX or MTX-dextran was diffused into the three-dimensional tumor cell matrix for 10 days, cytotoxic activity penetrated > 2 cm for MTX-amide-dextran and approximately 1 cm for MTX or MTX-ester-dextran; this enhanced penetration correlated with the stability of the MTX-dextran linkage. Intracranial polymeric delivery of MTX or MTX-amide-dextran to rats with intracranial 9L gliosarcoma produced modest but significant increases in survival; conjugation of MTX to dextran appeared to shift the dose-response curve to a lower dosage.
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Affiliation(s)
- W Dang
- Department of Chemical Engineering, Johns Hopkins University, Baltimore, Maryland 21218
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Rennick D, Hunte B, Dang W, Thompson-Snipes L, Hudak S. Interleukin-10 promotes the growth of megakaryocyte, mast cell, and multilineage colonies: analysis with committed progenitors and Thy1loSca1+ stem cells. Exp Hematol 1994; 22:136-41. [PMID: 8299735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The growth-promoting activities of interleukin-10 (IL-10) were assessed in hematopoietic colony-forming assays. We found that IL-10 failed to support the clonal growth of normal and lineage-depleted (Lin-) bone marrow (BM) cells. Furthermore, IL-10 neither enhanced nor suppressed colony formation by eosinophil, neutrophil, or macrophage progenitors when combined with a variety of factors. IL-10 stimulated a modest increase in erythropoietin (Epo)-dependent erythroid colonies but had no effect on the burst-promoting activities of IL-3. However, the combination of IL-10 plus IL-3 resulted in the enhanced growth of mast cell progenitors. In addition to its mast cell stimulating activity, IL-10 promoted the growth of megakaryocyte (Mk) and Mk-mixed colonies when combined with Epo or with Epo plus IL-3, IL-6, or IL-11. Comparative studies showed that the megakaryocyte potentiating activity of IL-10 is roughly equivalent to that of IL-6 and IL-11. In experiments using Thy1loSca1+ stem cells, IL-10 was shown to enhance the number of cells initiating IL-3-dependent colony formation. IL-10 also costimulated increased colony formation when used with IL-3 and another factor such as IL-1, IL-6, and granulocyte colony-stimulating factor (G-CSF). Cellular analysis of the resulting colonies indicated that IL-10 increases the formation of multilineage colonies containing erythrocytes, megakaryocytes, and/or mast cells. The ability of IL-10 to cooperatively regulate various stages of hematopoietic development is discussed.
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Affiliation(s)
- D Rennick
- Department of Immunology, DNAX Research Institute, Palo Alto, CA 94304
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Abstract
We have investigated the relevance of interleukin-1 receptor type I (IL-1R tI) in the implantation process in vivo in a murine model. Indirect immunofluorescence experiments demonstrate that IL-1R tI is located in mouse endometrial lumenal epithelium with increased intensity in the periimplantation period, whereas IL-1 beta staining is located in the mouse placenta. PMSG/human CG (hCG)-stimulated and mated 12-week-old B6C3F-1 female mice were randomly allocated to three groups: A, control noninjected; B, buffer-injected animals; and C, animals injected ip with 20 micrograms recombinant human IL-1 receptor antagonist (rhIL-1ra) every 12 h beginning on pregnancy day 3. Injections were continued until day 9, and animals were killed 12 h after the last injection. Pregnancy rates in the three groups were: noninjected, 58.8% (10 of 17); buffer-injected, 73.7% (14 of 19); rhIL-1ra-injected, 6.7% (1 of 15), P = 0.0001155, Fisher exact test. To rule out the possibility that pregnancy failure was due to an embryotoxic effect of rhIL-1ra, 2-cell mouse embryos (n = 276) were flushed from the same group of animals used for in vivo experiments and cultured with increasing concentrations of rhIL-1ra: 0 microgram/ml (n = 91), 1 microgram/ml (n = 36), 50 micrograms/ml (n = 36), 100 micrograms/ml (n = 52), and 200 micrograms/ml (n = 61) rhIL-1ra. The percentages of 2-cell mouse embryos reaching the blastocyst stage after 72 h in culture were 85.7%, 91.6%, 94.4%, 96%, and 85.2%, respectively. We further cultured these blastocysts for 5 days on fibronectin-coated plates with or without 200 micrograms/ml rhIL-1ra. In both groups, hatching, attachment to fibronectin, outgrowth, and migration were documented to be similar. Furthermore, our longitudinal morphological study of embryonic implantation in control and rhIL-1ra-injected mice shows that the blockade of IL-1R tI interferes with the attachment of mouse blastocysts to maternal endometrium in vivo. In summary, we demonstrate that blockade of maternal endometrial IL-1R tI with IL-1ra prevents implantation in the mouse by interfering with embryonic attachment, without adverse effects on blastocyst formation, hatching, fibronectin attachment, outgrowth, and migration in vitro.
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Affiliation(s)
- C Simón
- Department of Gynecology and Obstetrics, Stanford University Medical Center, California 94305
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de Waal Malefyt R, Figdor CG, Huijbens R, Mohan-Peterson S, Bennett B, Culpepper J, Dang W, Zurawski G, de Vries JE. Effects of IL-13 on phenotype, cytokine production, and cytotoxic function of human monocytes. Comparison with IL-4 and modulation by IFN-gamma or IL-10. The Journal of Immunology 1993. [DOI: 10.4049/jimmunol.151.11.6370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Recently, we described the cloning and expression of a human cDNA which is the homologue to P600, a gene transcribed by mouse Th2 clones. Based on its activities on human monocytes and B cells this gene was designated IL-13. In the present study we investigated the effects of IL-13 alone or in combination with IL-4, IFN-gamma, or IL-10 on human monocytes. IL-13 induced significant changes in the phenotype of monocytes. Like IL-4, it enhanced the expression of CD11b, CD11c, CD18, CD29, CD49e (VLA-5), class II MHC, CD13, and CD23, whereas it decreased the expression of CD64, CD32, CD16, and CD14 in a dose-dependent manner. IL-13 induced up-regulation of class II MHC Ag and its down-regulatory effects on CD64, CD32, and CD16 expression were prevented by IL-10. IFN-gamma could also partially prevent the IL-13-induced down-regulation of CD64, but not that of CD32 and CD16. However, IL-13 strongly inhibited spontaneous and IL-10- or IFN-gamma-induced ADCC activity of human monocytes toward anti-D coated Rh+ erythrocytes, indicating that the cytotoxic activity of monocytes was inhibited. Furthermore, IL-13 inhibited production of IL-1 alpha, IL-1 beta, IL-6, IL-8, IL-10, IL-12 p35, IL-12 p40, macrophage inflammatory protein-1 alpha, granulocyte/macrophage-CSF, granulocyte-CSF, IFN-alpha, and TNF alpha by monocytes activated with LPS. In contrast, IL-13 enhanced the production of IL-1 ra by these cells. Similar results on cytokine production were observed or have been obtained with IL-4. Thus IL-13 shares most of its activities on human monocytes with IL-4, but no additive or synergistic effects of IL-4 and IL-13 on human monocytes were observed, suggesting that these cytokines may share common receptor components. Taken together, these results indicate that IL-13 has anti-inflammatory and important immunoregulatory activities.
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Affiliation(s)
- R de Waal Malefyt
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - C G Figdor
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - R Huijbens
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - S Mohan-Peterson
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - B Bennett
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - J Culpepper
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - W Dang
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - G Zurawski
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
| | - J E de Vries
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
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de Waal Malefyt R, Figdor CG, Huijbens R, Mohan-Peterson S, Bennett B, Culpepper J, Dang W, Zurawski G, de Vries JE. Effects of IL-13 on phenotype, cytokine production, and cytotoxic function of human monocytes. Comparison with IL-4 and modulation by IFN-gamma or IL-10. J Immunol 1993; 151:6370-81. [PMID: 7902377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Recently, we described the cloning and expression of a human cDNA which is the homologue to P600, a gene transcribed by mouse Th2 clones. Based on its activities on human monocytes and B cells this gene was designated IL-13. In the present study we investigated the effects of IL-13 alone or in combination with IL-4, IFN-gamma, or IL-10 on human monocytes. IL-13 induced significant changes in the phenotype of monocytes. Like IL-4, it enhanced the expression of CD11b, CD11c, CD18, CD29, CD49e (VLA-5), class II MHC, CD13, and CD23, whereas it decreased the expression of CD64, CD32, CD16, and CD14 in a dose-dependent manner. IL-13 induced up-regulation of class II MHC Ag and its down-regulatory effects on CD64, CD32, and CD16 expression were prevented by IL-10. IFN-gamma could also partially prevent the IL-13-induced down-regulation of CD64, but not that of CD32 and CD16. However, IL-13 strongly inhibited spontaneous and IL-10- or IFN-gamma-induced ADCC activity of human monocytes toward anti-D coated Rh+ erythrocytes, indicating that the cytotoxic activity of monocytes was inhibited. Furthermore, IL-13 inhibited production of IL-1 alpha, IL-1 beta, IL-6, IL-8, IL-10, IL-12 p35, IL-12 p40, macrophage inflammatory protein-1 alpha, granulocyte/macrophage-CSF, granulocyte-CSF, IFN-alpha, and TNF alpha by monocytes activated with LPS. In contrast, IL-13 enhanced the production of IL-1 ra by these cells. Similar results on cytokine production were observed or have been obtained with IL-4. Thus IL-13 shares most of its activities on human monocytes with IL-4, but no additive or synergistic effects of IL-4 and IL-13 on human monocytes were observed, suggesting that these cytokines may share common receptor components. Taken together, these results indicate that IL-13 has anti-inflammatory and important immunoregulatory activities.
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Affiliation(s)
- R de Waal Malefyt
- Department of Human Immunology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
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McKenzie AN, Culpepper JA, de Waal Malefyt R, Brière F, Punnonen J, Aversa G, Sato A, Dang W, Cocks BG, Menon S. Interleukin 13, a T-cell-derived cytokine that regulates human monocyte and B-cell function. Proc Natl Acad Sci U S A 1993; 90:3735-9. [PMID: 8097324 PMCID: PMC46376 DOI: 10.1073/pnas.90.8.3735] [Citation(s) in RCA: 424] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
We have isolated the human cDNA homologue of a mouse helper T-cell-specific cDNA sequence, called P600, from an activated human T-cell cDNA library. The human cDNA encodes a secreted, mainly unglycosylated, protein with a relative molecular mass of approximately 10,000. We show that the human and mouse proteins cause extensive morphological changes to human monocytes with an associated up-regulation of major histocompatibility complex class II antigens and the low-affinity receptor for immunoglobulin E (Fc epsilon RII or CD23). In addition, they stimulate proliferation of human B cells that have been activated by anti-IgM antibodies or by anti-CD40 monoclonal antibodies presented by a mouse Ltk- cell line transfected with CDw32. Furthermore, the human protein induced considerable levels of IgM and IgG, but no IgA production, in cultures in which highly purified human surface IgD+ or total B cells were cocultured with an activated CD4+ T-cell clone. Based on these findings, we propose that this immunoregulatory protein be designated interleukin 13.
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Affiliation(s)
- A N McKenzie
- Department of Molecular Biology, DNAX Research Institute of Molecular and Cellular Biology, Palo Alto, CA 94304-1104
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Abstract
Intracranial controlled release polymers may improve drug administration to the brain, where therapy is frequently limited due to the low permeability of brain capillaries to therapeutic agents. On the basis of drug transport and elimination rates, we proposed that high molecular weight, water-soluble molecules would be retained in the brain space following release from an intracranial implant. To test this hypothesis, solid particles of different molecular weight fractions of fluorescein isothiocyanate labeled dextran (FITC-dextran; 4 x 10(3) Da (4 kDa) < weight-averaged molecular weight (Mw) < 150 kDa) or fluorescein were uniformly dispersed in matrices of a polyanhydride copolymer synthesized from a fatty acid dimer and sebacic acid in a 50:50 ratio, P(FAD:SA). When incubated in buffered saline, FITC-dextran fractions of 70 kDa Mw were released from the polymer within 48 h; 4 kDa Mw FITC-dextran and fluorescein were released more slowly. Following implantation of P(FAD:SA) matrices containing either 70 kDa Mw FITC-dextran, 4 kDa Mw FITC-dextran, or fluorescein into the brains of normal rats, fluorescent tracers were continuously released into the brain tissue for 30 days. Tracer concentrations within the brain were significantly higher for large molecular weight tracers (70 kDa Mw FITC-dextran >> 4 kDa Mw FITC-dextran > fluorescein). The rate of elimination, kapp, of each tracer from the brain was determined by comparing experimental data with a model describing tracer diffusion/elimination in the brain extracellular space; kapp decreased with increasing molecular weight (fluorescein > 4 kDa Mw FITC-dextran > 70 kDa Mw FITC-dextran).
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Affiliation(s)
- W Dang
- Department of Chemical Engineering, Johns Hopkins University, Baltimore, Maryland 21218
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