1
|
Liang S, Guan H, Zhang H, Han X, Zhao J, Dou S, Hao S, Zhou H, Geng C, Zhao T, Gu J, Wei H, Li Y. Tunable High-Performance Electromagnetic Interference Shielding of VO 2 Nanowires-Based Composite. ACS Appl Mater Interfaces 2024. [PMID: 38607616 DOI: 10.1021/acsami.3c19326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
The unique metal-insulator transition of VO2 is very suitable for dynamic electromagnetic (EM) regulation materials due to its sharp change in electrical conductivity. Here, we have developed an off/on switchable electromagnetic interference (EMI) shielding composite by interconnecting VO2 nanowires (NWs) in poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) to form conductive networks, resulting in outstanding performance at the X and Ku bands with maximum change values of 44.8 and 59.4 dB, respectively. The unique insulator-to-metal transition (IMT) of VO2 NWs has dominated the variation of polarization loss (εp″) and conductivity loss (εσ″) for the composites, which is the mechanism of EMI shielding switching between off and on states. Furthermore, the composite exhibits good cycling stability of the off/on switchable EMI shielding performance and has excellent mechanical properties, especially with 200 times abrasion resistance without obvious weight loss. This study provides a unique approach for dynamic switching of EM response with the potential to construct practical intelligent EM response systems for next-generation smart electromagnetic devices in various scenarios.
Collapse
Affiliation(s)
- Shuhui Liang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China
| | - Huan Guan
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
| | - Hainan Zhang
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China
| | - Xiangge Han
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
| | - Jiupeng Zhao
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
- Suzhou Laboratory, Suzhou 2215123, China
| | - Sue Hao
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China
| | - Haoxin Zhou
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
| | - Chenchen Geng
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
| | - Tao Zhao
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
| | - Jinxin Gu
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, China
- Suzhou Laboratory, Suzhou 2215123, China
| | - Hang Wei
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, 150001 Harbin, China
- Suzhou Laboratory, Suzhou 2215123, China
| |
Collapse
|
2
|
Gu J, Wei H, Zhao T, Ren F, Geng C, Guan H, Liang S, Chen X, Shi Y, Zhao J, Dou S, Li Y. Unprecedented Spatial Manipulation and Transformation of Dynamic Thermal Radiation Based on Vanadium Dioxide. ACS Appl Mater Interfaces 2024; 16:10352-10360. [PMID: 38357765 DOI: 10.1021/acsami.3c17286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/16/2024]
Abstract
Reconfigurable infrared (IR) materials have widespread applications in thermal management and smart IR concealment. Although various reconfigurable IR materials can be customized by positive or negative differential VO2-based resonators, their insightful mechanism remains unknown. Here, we comprehensively investigate the fundamental design rule of reconfigurable thermal radiation between positive and negative differential thermal radiation properties for the first time. Importantly, the skin depth of VO2 film in the metal state is investigated to clarify the transformation from positive to negative differential thermal radiation properties, and the critical thickness is further derived, providing important guidance in designing the reconfigurable thermal radiation regulator. Furthermore, the reconfigurable multistate thermal images had been presented into one plate. The resulting emittance variation (△ε8-14 μm) of the VO2-based resonator can change from 0.61 to -0.53, which consummates the ability for diverse demands such as infrared concealment, thermal illusion, and thermal management. This work constitutes a promising and universal route toward designing whole smart devices and may create new scientific and technological opportunities for platforms that can benefit from reconfigurable electromagnetic manipulation.
Collapse
Affiliation(s)
- Jinxin Gu
- Suzhou Laboratory, Suzhou 215123, China
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Hang Wei
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Tao Zhao
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Feifei Ren
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Chenchen Geng
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Huan Guan
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Shuhui Liang
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Xi Chen
- Suzhou Laboratory, Suzhou 215123, China
| | | | - Jiupeng Zhao
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Yao Li
- Suzhou Laboratory, Suzhou 215123, China
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| |
Collapse
|
3
|
Wei H, Gu J, Zhao T, Yan Z, Xu HX, Dou S, Qiu CW, Li Y. Tunable VO 2 cavity enables multispectral manipulation from visible to microwave frequencies. Light Sci Appl 2024; 13:54. [PMID: 38378739 PMCID: PMC10879493 DOI: 10.1038/s41377-024-01400-w] [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: 10/26/2023] [Revised: 01/17/2024] [Accepted: 01/25/2024] [Indexed: 02/22/2024]
Abstract
Optical materials capable of dynamically manipulating electromagnetic waves are an emerging field in memories, optical modulators, and thermal management. Recently, their multispectral design preliminarily attracts much attention, aiming to enhance their efficiency and integration of functionalities. However, the multispectral manipulation based on these materials is challenging due to their ubiquitous wavelength dependence restricting their capacity to narrow wavelengths. In this article, we cascade multiple tunable optical cavities with selective-transparent layers, enabling a universal approach to overcoming wavelength dependence and establishing a multispectral platform with highly integrated functions. Based on it, we demonstrate the multispectral (ranging from 400 nm to 3 cm), fast response speed (0.9 s), and reversible manipulation based on a typical phase change material, vanadium dioxide. Our platform involves tandem VO2-based Fabry-Pérot (F-P) cavities enabling the customization of optical responses at target bands independently. It can achieve broadband color-changing capacity in the visible region (a shift of ~60 nm in resonant wavelength) and is capable of freely switching between three typical optical models (transmittance, reflectance, and absorptance) in the infrared to microwave regions with drastic amplitude tunability exceeding 0.7. This work represents a state-of-art advance in multispectral optics and material science, providing a critical approach for expanding the multispectral manipulation ability of optical systems.
Collapse
Affiliation(s)
- Hang Wei
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
- National University of Singapore, Department of Electrical & Computer Engineering, Singapore, 117583, Singapore
| | - Jinxin Gu
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
- Suzhou Laboratory, Suzhou, 215123, China
| | - Tao Zhao
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| | - Zhiyuan Yan
- National University of Singapore, Department of Electrical & Computer Engineering, Singapore, 117583, Singapore
| | - He-Xiu Xu
- National University of Singapore, Department of Electrical & Computer Engineering, Singapore, 117583, Singapore
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.
| | - Cheng-Wei Qiu
- National University of Singapore, Department of Electrical & Computer Engineering, Singapore, 117583, Singapore.
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China.
- Suzhou Laboratory, Suzhou, 215123, China.
| |
Collapse
|
4
|
Wang Y, Li X, Yan X, Dou S, Li Y, Wang L. Effects of Film Thickness on the Residual Stress of Vanadium Dioxide Thin Films Grown by Magnetron Sputtering. Materials (Basel) 2023; 16:5093. [PMID: 37512365 PMCID: PMC10386697 DOI: 10.3390/ma16145093] [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: 04/03/2023] [Revised: 07/05/2023] [Accepted: 07/15/2023] [Indexed: 07/30/2023]
Abstract
Vanadium dioxide (VO2) thin films of different thicknesses were prepared by regulating the deposition time (2, 2.5, 3, and 3.5 h). The impact of deposition time on the microstructure, surface morphology, and cross-section morphology was investigated. The results showed that the grain size increased with the film thickness. Meanwhile, the influence of film thickness on the residual stress was evaluated by X-ray diffraction. The phenomenon of "compressive-to-tensile stress transition" was illustrated as the thickness increased. The change of dominant mechanism for residual stress was used for explaining this situation. First, the composition of residual stress indicates that growth stress play a key role. Then, the effect of "atomic shot peening" can be used to explain the compressive stress. Lastly, the increased grain size, lower grain boundary density, and "tight effect" in the progress of film growth cause tensile stress.
Collapse
Affiliation(s)
- Yuemin Wang
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
- Jiangxi Construction Engineering (Group) Construction Industry Investment Corporation Limited, Nanchang 330029, China
| | - Xingang Li
- Jiangxi Construction Engineering (Group) Corporation Limited, Nanchang 330029, China
| | - Xiangqiao Yan
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150080, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150080, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150080, China
| | - Lei Wang
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| |
Collapse
|
5
|
Wang Y, Li X, Lu J, Li Y, Yan X, Dou S, Wang L. Measurement of Mechanical Properties of VO 2 Films by Nanoindentation. Nanomaterials (Basel) 2023; 13:1042. [PMID: 36985936 PMCID: PMC10056105 DOI: 10.3390/nano13061042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 02/28/2023] [Accepted: 03/09/2023] [Indexed: 06/18/2023]
Abstract
The present work reported the intrinsic mechanical behavior of vanadium dioxide (VO2) thin film deposited on a SiO2 substrate using a combination of nanoindentation tests and a theoretical model. The effect of phase transition on mechanical parameters was studied by adjusting the test temperature. A new model that can simultaneously extract the elastic modulus and hardness was derived by introducing a dimensional analysis. The results showed that the thin film exhibits a hardness of 9.43 GPa and a Young's modulus of about 138.5 GPa at room temperature, compared with the values of 5.71 GPa and 126.9 GPa at a high temperature, respectively. It can be seen that the intrinsic mechanical parameters decrease to a certain extent after a phase transition. Finally, the numerical simulation results were consistent with those of the experiments, which verified the effectiveness of the new method. In addition, this study also provided useful guidance for mechanical tests on other ultra-thin films.
Collapse
Affiliation(s)
- Yuemin Wang
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Xingang Li
- Jiangxi Construction Engineering (Group) Corporation Limited, Nanchang 330029, China
| | - Jiarui Lu
- School of Engineering, Hong Kong University of Science and Technology, Hong Kong 999077, China
| | - Yao Li
- Center for Composite Materials and Structure, Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150080, China
| | - Xiangqiao Yan
- Center for Composite Materials and Structure, Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150080, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150080, China
| | - Lei Wang
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| |
Collapse
|
6
|
Wang Y, Wang L, Gu J, Yan X, Lu J, Dou S, Li Y, Wang L. Analysis of Thermal Stress in Vanadium Dioxide Thin Films by Finite Element Method. Nanomaterials (Basel) 2022; 12:4262. [PMID: 36500885 PMCID: PMC9735821 DOI: 10.3390/nano12234262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/22/2022] [Accepted: 11/28/2022] [Indexed: 06/17/2023]
Abstract
The buckling, de-lamination, and cracking of the thin film/substrate system caused by thermal stress is the main obstacle for functional failure. Moreover, the thermal stress of vanadium dioxide (VO2) thin film may be more complicated due to the stress re-distribution caused by phase transition. Therefore, the thermal stress of VO2 thin films deposited on four substrates with different materials (fused silica, silicon slice, sapphire, and glass) has been studied by finite element method in the present work. The influences of external temperature, substrate, and interlayer on thermal stress were analyzed. It was found that the substrates can greatly affect the thermal stresses, which were mainly caused by the mismatch of coefficient of thermal expansion (CTE). The thermal stress had a linear relationship with the external temperature, but this tendency would be redistributed or even change direction when phase transition occurred. The simulated results were in tandem with the analytical method. Meanwhile, the radial stress and shear stress distribution under the influence of phase transition were calculated. In addition, the reduction of thermal stress and shear stress showed that the appropriate interlayer can enhance the adhesive strength effectively.
Collapse
Affiliation(s)
- Yuemin Wang
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
- College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
| | - Lebin Wang
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, China
| | - Jinxin Gu
- Center for Composite Materials and Structure, Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150080, China
| | - Xiangqiao Yan
- Center for Composite Materials and Structure, Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150080, China
| | - Jiarui Lu
- School of Engineering, Hong Kong University of Science and Technology, Hong Kong 999077, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150080, China
| | - Yao Li
- Center for Composite Materials and Structure, Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150080, China
| | - Lei Wang
- Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, China
| |
Collapse
|
7
|
Xu X, Gu J, Zhao H, Zhang X, Dou S, Li Y, Zhao J, Zhan Y, Li X. Passive and Dynamic Phase-Change-Based Radiative Cooling in Outdoor Weather. ACS Appl Mater Interfaces 2022; 14:14313-14320. [PMID: 35302341 DOI: 10.1021/acsami.1c23401] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Radiative cooling has attracted considerable attention due to its tremendous potential in exploiting the cold reservoir of deep sky. However, overcooling always occurs in the conventional static radiative coolers because they operate only in the cooling mode in both hot and cold. Therefore, a dynamic radiative cooler based on phase change materials is highly desired. Nevertheless, the practical outdoor phase-change-based dynamic radiative cooling has not yet been experimentally demonstrated. To satisfy the stringent requirement of the phase-change-based radiative cooler in outdoor weather conditions, we engineered the phase-change material (VO2) to possess the room-temperature phase-transition capability for typical weather conditions. Second, the reconfigurable cavity consists of the lossless spacer to ensure the magnitude of thermal modulation and suppress the solar absorption simultaneously. Third, the practical selective-filtering method is devised to shield the solar irradiance while permitting the thermal emission. Our experiment demonstrates that these materials and photonic measures can work together to realize the dynamic radiative cooling in actual weather conditions, which shows a self-adaptive switch between the ON-cooling state in hot daytime and the OFF-cooling state in cold nighttime. The study pushes the radiative cooler toward multifunctionality and provides beneficial guidance for the phase-change-based intelligent thermal control.
Collapse
Affiliation(s)
- Xiudong Xu
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China
| | - Jinxin Gu
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Haipeng Zhao
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China
| | - Xinyuan Zhang
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Jiupeng Zhao
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Yaohui Zhan
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China
| | - Xiaofeng Li
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China
| |
Collapse
|
8
|
Gu J, Wei H, Ren F, Guan H, Liang S, Geng C, Li L, Zhao J, Dou S, Li Y. VO 2-Based Infrared Radiation Regulator with Excellent Dynamic Thermal Management Performance. ACS Appl Mater Interfaces 2022; 14:2683-2690. [PMID: 34981915 DOI: 10.1021/acsami.1c17914] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Dynamic thermal management materials attract fast-increasing interest due to their adaptability to changing environments and greater energy savings as compared to static materials. However, the high transition temperature and the low emittance tunability of the vanadium dioxide (VO2)-based infrared radiation regulators limit their practical applications. This study addresses these issues by proposing a smart infrared radiation regulator based on a Fabry-Pérot cavity structure (VO2/HfO2/Al), which is prepared by high-power impulse magnetron sputtering (HiPIMS) and has the potential for large-scale production. Remarkably, the outstanding emittance tunability reaches 0.51, and the phase transition temperature is lowered to near a room temperature of 27.5 °C by tungsten (W) doping. In addition, a numerical thermal management power of 196.3 W/m2 (at 8-14 μm band) can be obtained from 0 to 60 °C. As a proof-of-concept, the demonstrated capabilities of the VO2 infrared radiation regulator show great potentials in a wide range of applications for the thermal management of buildings and vehicles.
Collapse
Affiliation(s)
- Jinxin Gu
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Hang Wei
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Feifei Ren
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Huan Guan
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Shuhui Liang
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Chenchen Geng
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Long Li
- Shanghai Institute of Spacecraft Equipment, Shanghai 200240, China
| | - Jiupeng Zhao
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| |
Collapse
|
9
|
Lu M, Li C, Liu C, Chi N, Dou S. Screening, identification, purification and homologous modeling of marine cold-active alpha-amylase. Cryo Letters 2021; 42:341-352. [PMID: 35366300] [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: 06/14/2023]
Abstract
BACKGROUND Cold-active α-amylase is essential in industrial production. However, the number of cold-active α-amylases available for use is limited. Screening microbial strains would lay the groundwork for the future development of the food and pharmaceutical industries. OBJECTIVE To screen microbial strains for cold-active α-amylase based on physiological and biochemical identification, as well as homology modelling. MATERIALS AND METHODS Cold-active α-amylase strains were screened from water and mud obtained from the Yellow Sea. Colony morphology, Gram staining, scanning electron microscopy and transmission electron microscopy, physiological and biochemical identification and 16S rRNA gene analysis were used to identify strains. A series of steps, including DEAE-anion exchange column chromatography, SephadexG-100 column chromatography, and SDS-PAGE electrophoresis, were used to produce cold-active α-amylase of relatively high purity. Finally, the homology of amylase was modeled to explore the structure and activity site of the enzyme. RESULTS The named dsh19-1 strain of cold-active α-amylase was screened and identified as Bacillus. The cold-active α-amylase produced by Bacillus was named AmyD-1. The protein with PDB sequence number 5A2B was found to have 40.6% homology with AmyD-1. The verification score of the 3-D model was 137.07 points. We discovered that the six sites are potential sites for amylase to decompose starch by building a 3-D AmyD-1 model. AmyD-1 has a molecular weight of 1515 bp, and hydrogen bonding may be the primary interaction force between AmyD-1 and glucose molecules. CONCLUSION A cold-active α-amylase produced by Bacillus strain dsh19-1 was successfully obtained and named AmyD-1. This enzyme has potential uses in the food and pharmaceutical industries.
Collapse
Affiliation(s)
- M Lu
- School of Life Science and Technology, Dalian University, Dalian 116622, China
| | - C Li
- School of Life Science and Technology, Dalian University, Dalian 116622, China
| | - C Liu
- School of Life Science and Technology, Dalian University, Dalian 116622, China
| | - N Chi
- School of Life Science and Technology, Dalian University, Dalian 116622, China
| | - S Dou
- School of Life Science and Technology, Dalian University, Dalian 116622, China.
| |
Collapse
|
10
|
Wei H, Gu J, Ren F, Zhang L, Xu G, Wang B, Song S, Zhao J, Dou S, Li Y. Smart Materials for Dynamic Thermal Radiation Regulation. Small 2021; 17:e2100446. [PMID: 34013667 DOI: 10.1002/smll.202100446] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/19/2021] [Indexed: 05/25/2023]
Abstract
Thermal radiation in the mid-infrared region profoundly affects human lives in various fields, including thermal management, imaging, sensing, camouflage, and thermography. Due to their fixed emissivities, radiance features of conventional materials are usually proportional to the quadruplicate of surface temperature, which set the limit, that one type of material can only present a single thermal function. Therefore, it is necessary and urgent to design materials for dynamic thermal radiation regulations to fulfill the demands of the age of intelligent machines. Recently, the ability of some smart materials to dynamically regulate thermal radiation has been evaluated. These materials are found to be competent enough for various commands, thereby, providing better alternatives and tremendously promoting the commercial potentials. In this review, the dynamic regulatory mechanisms and recent progress in the evaluation of these smart materials are summarized, including thermochromic materials, electrochromic materials, mechanically and humidity responsive materials, with the potential applications, insufficient problems, and possible strategies highlighted.
Collapse
Affiliation(s)
- Hang Wei
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| | - Jinxin Gu
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Feifei Ren
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| | - Leipeng Zhang
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| | - Gaoping Xu
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| | - Bo Wang
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| | - Shanshan Song
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Jiupeng Zhao
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| |
Collapse
|
11
|
Gao L, Zhang X, Dou S, Yue X, Yang J. [Interference of long noncoding RNA FOXCUT inhibits epithelial-mesenchymal transformation and induces mitochondrial injury in nasopharyngeal carcinoma cells]. Nan Fang Yi Ke Da Xue Xue Bao 2021; 41:1334-1341. [PMID: 34658347 DOI: 10.12122/j.issn.1673-4254.2021.09.07] [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] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Abstract
OBJECTIVE To investigate the effects of RNA interference of long noncoding RNA FOXCUT on epithelial mesenchymal transformation and mitochondrial function in nasopharyngeal carcinoma (NPC) cells. METHODS FOXCUT expression levels were detected by RT-PCR in tumor tissues and adjacent tissues from 50 patients with NPC and in NP69, CNE1, CNE2, SUNE2, HER2 and 5-8F cell lines. CNE1 cells were transfected with a short hairpin RNA (shRNA) targeting FOXCUT or a negative control RNA construct (shRNA-NC), and the changes in cell proliferation and morphology were assessed with CCK8 assay, clone formation assay and microscopic observation. An immunofluorescence assay was used to examine the vimentin-positive cells, and the levels of SOD, MDA and LDH in the cells were detected. The changes of mitochondrial membrane potential were detected with flow cytometry, and the expression levels of E-cad, N-cad, vimentin, Bax, Bcl-2, caspase-3 and c-Myc in the cells were detected with Western blotting. RESULTS The expression level of FOXCUT was significantly increased in NPC tissues as compared with the adjacent tissues (P < 0.001). Compared with NP69 cells, CNE1, CNE2, SUNE2, HER2 and 5-8F cells all exhibited significantly increased expressions of FOXCUT (P < 0.001). In CNE1 cells, transfection with FOXCUT shRNA significantly inhibited cell proliferation and clone formation (P < 0.001), and caused obvious changes in cell morphology. FOXCUT knockdown significantly decreased the expressions of N-cad and vimentin, increased E- cad expression and the contents of MDA and LDH (P < 0.05), reduced vimentin- positive cells and the activity of SOD, and caused a shift of red fluorescent cells to green fluorescent cells and an increased percentage of green fluorescent cells. FOXCUT knockdown also resulted in significantly increased expressions of Bax/Bcl2 and cleaved Cas3/Cas3 and a lowered expression of c-Myc. CONCLUSIONS Interference of FOXCUT can inhibit the proliferation and epithelial-mesenchymal transformation, enhance oxidative stress, induce mitochondrial function injury, and promote apoptosis in NPC cells, suggesting the potential of FOXCUT interference for targeted treatment of NPC.
Collapse
Affiliation(s)
- L Gao
- School of Medicine, Xijing University, Xi'an 710000, China
| | - X Zhang
- Department of Otolaryngology, Affiliated Hospital of Shaanxi University of Chinese Medicine, Xianyang 712000, China
| | - S Dou
- School of Medicine, Xijing University, Xi'an 710000, China
| | - X Yue
- School of Medicine, Xijing University, Xi'an 710000, China
| | - J Yang
- School of Medicine, Xijing University, Xi'an 710000, China
| |
Collapse
|
12
|
Ma H, Wang L, Dou S, Zhao H, Huang M, Xu Z, Zhang X, Xu X, Zhang A, Yue H, Ali G, Zhang C, Zhou W, Li Y, Zhan Y, Huang C. Flexible Daytime Radiative Cooling Enhanced by Enabling Three-Phase Composites with Scattering Interfaces between Silica Microspheres and Hierarchical Porous Coatings. ACS Appl Mater Interfaces 2021; 13:19282-19290. [PMID: 33866783 DOI: 10.1021/acsami.1c02145] [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] [Indexed: 06/12/2023]
Abstract
Daytime radiative cooling has attracted considerable attention recently due to its tremendous potential for passively exploiting the coldness of the universe as clean and renewable energy. Many advanced materials with novel photonic micro/nanostructures have already been developed to enable highly efficient daytime radiative coolers, among which the flexible hierarchical porous coatings (HPCs) are a more distinguished category. However, it is still hard to precisely control the size distribution of the randomized pores within the HPCs, usually resulting in a deficient solar reflection at the near-infrared optical regime under diverse fabrication conditions of the coatings. We report here a three-phase (i.e., air pore-phase, microsphere-phase, and polymer-phase) self-assembled hybrid porous composite coating, which dramatically increases the average solar reflectance and yields remarkable temperature drops of ∼10 and ∼ 30 °C compared to the ambient circumstance and black paint, respectively, according to the rooftop measurements. Mie theory and Monte Carlo simulations reveal the origin of the low reflectivity of as-prepared two-phase porous HPCs, and the optical cooling improvement of the three-phase porous composite coatings is attributed to the newly generated interfaces possessing the high scattering efficiency between the hierarchical pores and silica microspheres hybridized with appropriate mass fractions. As a result, the hybrid porous composite approach enhances the whole performance of the coatings, which provides a promising alternative to the flexible daytime radiative cooler.
Collapse
Affiliation(s)
- Hongchen Ma
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Liang Wang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
| | - Shuliang Dou
- National Key Laboratory of Science and Technology on Advanced Composites, Harbin Institute of Technology, Harbin 150001, China
| | - Haipeng Zhao
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Min Huang
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Zewen Xu
- Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Xinyuan Zhang
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Xiudong Xu
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Aiqin Zhang
- Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Huiyu Yue
- Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Ghulam Ali
- Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
| | - Caihua Zhang
- Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
- School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Wenying Zhou
- School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
| | - Yao Li
- National Key Laboratory of Science and Technology on Advanced Composites, Harbin Institute of Technology, Harbin 150001, China
| | - Yaohui Zhan
- School of Optoelectronic Science and Engineering & Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
- Light Industry Institute of Electrochemical Power Sources, Zhangjiagang 215600, China
| | - Cheng Huang
- Soochow Institute for Energy and Materials Innovations, College of Energy, Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
- Light Industry Institute of Electrochemical Power Sources, Zhangjiagang 215600, China
| |
Collapse
|
13
|
Ren F, Gu J, Wei H, Xu G, Zhao J, Dou S, Li Y. Effect of Unit Cell Shape on Switchable Infrared Metamaterial VO 2 Absorbers/Emitters. Research (Wash D C) 2021; 2021:9804183. [PMID: 33982002 PMCID: PMC8087995 DOI: 10.34133/2021/9804183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 03/23/2021] [Indexed: 06/12/2023]
Abstract
Metamaterial absorber/emitter is an important aspect of infrared radiation manipulation. In this paper, we proposed four simple switchable infrared metamaterial absorbers/emitters with Ag/VO2 disks on the Ag plane employing triangle, square, hexagon, and circle unit cells. The spectral absorption peaks whose intensities are above 0.99 occur at ~4 μm after structure optimization when VO2 is in insulating state and disappear when VO2 becomes metallic state. The simulated electromagnetic field reveals that the spectral absorption peaks are attributed to the excitation of magnetic polariton within the insulating VO2 spacer layer, whose values exceed 1.59 orders of magnitude higher than the incident magnetic field. Longer resonant wavelength would be excited in square arrays because its configuration is a better carrier of charges at the same spans. For absorption stability, the absorbers/emitters with square and circular structures do not have any change with the polarization angles changing from 0° to 90°, due to the high rotational symmetric structure. And four absorbers/emitters reveal similar shifts and attenuations under different incident angles. We believed that the switchable absorber/emitter demonstrates promising applications in the sensing technology and adaptive infrared system.
Collapse
Affiliation(s)
- Feifei Ren
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Jinxin Gu
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Hang Wei
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Gaoping Xu
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Jiupeng Zhao
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Shuliang Dou
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin 150001, China
| |
Collapse
|
14
|
Dou S, Xu H, Zhao J, Zhang K, Li N, Lin Y, Pan L, Li Y. Bioinspired Microstructured Materials for Optical and Thermal Regulation. Adv Mater 2021; 33:e2000697. [PMID: 32686250 DOI: 10.1002/adma.202000697] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 04/28/2020] [Indexed: 06/11/2023]
Abstract
Precise optical and thermal regulatory systems are found in nature, specifically in the microstructures on organisms' surfaces. In fact, the interaction between light and matter through these microstructures is of great significance to the evolution and survival of organisms. Furthermore, the optical regulation by these biological microstructures is engineered owing to natural selection. Herein, the role that microstructures play in enhancing optical performance or creating new optical properties in nature is summarized, with a focus on the regulation mechanisms of the solar and infrared spectra emanating from the microstructures and their role in the field of thermal radiation. The causes of the unique optical phenomena are discussed, focusing on prevailing characteristics such as high absorption, high transmission, adjustable reflection, adjustable absorption, and dynamic infrared radiative design. On this basis, the comprehensive control performance of light and heat integrated by this bioinspired microstructure is introduced in detail and a solution strategy for the development of low-energy, environmentally friendly, intelligent thermal control instruments is discussed. In order to develop such an instrument, a microstructural design foundation is provided.
Collapse
Affiliation(s)
- Shuliang Dou
- National Key Laboratory of Science and Technology on Advanced Composites, Harbin Institute of Technology, Harbin, 150006, China
| | - Hongbo Xu
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Jiupeng Zhao
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Ke Zhang
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Na Li
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Yipeng Lin
- School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin, 150001, China
| | - Lei Pan
- National Key Laboratory of Science and Technology on Advanced Composites, Harbin Institute of Technology, Harbin, 150006, China
| | - Yao Li
- Center for Composite Materials and Structure, Harbin Institute of Technology, Harbin, 150001, China
| |
Collapse
|
15
|
Zhang P, Zhang K, Chen X, Dou S, Zhao J, Li Y. Influence of Coagulation Bath Temperature on the Structure and Dielectric Properties of Porous Polyimide Films in Different Solvent Systems. ACS Omega 2020; 5:29889-29895. [PMID: 33251424 PMCID: PMC7689915 DOI: 10.1021/acsomega.0c04103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Accepted: 10/26/2020] [Indexed: 06/12/2023]
Abstract
In this work, the effect of coagulation bath temperature in different solvent systems [1,4-butyrolactone (GBL)/N,N-dimethylacetamide (DMAC)] on the structure and dielectric properties of polyimide (PI) films was investigated for the first time. The solubility parameter was introduced to explain the formation process of porous PI films. The results showed that the changed tendency of the dielectric constant versus temperature is opposite for the single-solvent system and cosolvent system. For a single DMAC and GBL solvent, the dielectric constants of the films decreased with increasing temperature. In contrast, the dielectric constants increased with the increase in temperature for the GBL/DMAC cosolvent system. Moreover, the measured porosities were applied to estimate the dielectric constants of the PI films. This showed that the porosity increased with increasing temperature for a single-solvent system, while it decreased for a cosolvent system. Scanning electron microscopy images suggested that the variation trends are derived from the different influences of the temperature on the structure and morphology. Thus, this study reveals the effect of coagulation bath temperature on the structure and dielectric properties of porous PI films and provides the guidance for the design and optimization of architectures for high-performance porous films.
Collapse
Affiliation(s)
- Panpan Zhang
- Taiyuan
University of Science and Technology, Jincheng Campus, Jincheng 048011, People’s Republic
of China
| | - Ke Zhang
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Xi Chen
- Center
for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s
Republic of China
| | - Shuliang Dou
- Center
for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s
Republic of China
| | - Jiupeng Zhao
- MIIT
Key Laboratory of Critical Materials Technology for New Energy Conversion
and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
| | - Yao Li
- Center
for Composite Materials and Structures, Harbin Institute of Technology, Harbin 150001, People’s
Republic of China
| |
Collapse
|
16
|
Ye L, Li R, Dou S, Shao Z, Ji T, Zhu G. A Phase II Trial of Radiotherapy Concurrent with Apatinib in Locally Advanced Bone and Soft Tissue Sarcoma of the Head and Neck: Preliminary Results. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2020.07.862] [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: 11/24/2022]
|
17
|
Li X, Zhang L, Xu G, Wang B, Yu S, Ren Z, Ren F, Dou S, Li Y, Zhao J. Effect of ionic liquid electrolytes on the electrochemical stability and optical tunability of polyaniline-based infrared variable emittance devices. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.136935] [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: 10/23/2022]
|
18
|
Chen X, Dou S, Li W, Liu D, Zhang Y, Zhao Y, Li Y, Zhao J, Zhang X. All solid state electrochromic devices based on the LiF electrolyte. Chem Commun (Camb) 2020; 56:5018-5021. [PMID: 32242572 DOI: 10.1039/d0cc00697a] [Citation(s) in RCA: 7] [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: 12/18/2022]
Abstract
The unsafe deposition process and slow deposition rate of the electrolyte layers are the main obstacles for electrochromic devices (ECDs) toward commercial application. In this work, an ECD with a structure of glass/ITO/WO3/LiF/NiO/ITO has been prepared by electron beam and resistance evaporation methods. The LiF electrolyte is deposited by resistance evaporation with the LiF particles and shows promising potential as the Li+ based electrolyte in ECDs owing to its high transparency and good ionic conductivity. The ECD shows a fast response (4.0 s for bleaching and 9.6 s for coloring), large optical transmittance modulations (∼58.9% at 625 nm, 100 s for coloring), good stability and high coloration efficiency (88.5 cm2 C-1). This work not only indicates that LiF can be used as a Li+ based electrolyte in an ECD, but also paves a new way to fast and safe preparation of ECDs with high performance.
Collapse
Affiliation(s)
- Xi Chen
- National Key Laboratory of Science and Technology on Advanced Composites in Special Environments, Harbin Institute of Technology, Harbin 150001, P. R. China.
| | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Jiang W, Dou S, Li R, Zhang L, Zhu G. Efficacy and safety of Apatinib and Tegafur Gimeracil Oteracil as Induction Chemotherapy in Locally Advanced Squamous Cell Carcinoma of the Head and Neck. Int J Radiat Oncol Biol Phys 2020. [DOI: 10.1016/j.ijrobp.2019.11.194] [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: 10/24/2022]
|
20
|
Dou S, Zhao J, Zhang W, Zhao H, Ren F, Zhang L, Chen X, Zhan Y, Li Y. A Universal Approach To Achieve High Luminous Transmittance and Solar Modulating Ability Simultaneously for Vanadium Dioxide Smart Coatings via Double-Sided Localized Surface Plasmon Resonances. ACS Appl Mater Interfaces 2020; 12:7302-7309. [PMID: 31968158 DOI: 10.1021/acsami.9b17923] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Vanadium dioxide (VO2)-based thermochromic coatings has attracted considerable attention in the application of smart windows as a result of their intriguing property of metal-insulator transition at moderate temperatures. However, the practical requirements of smart windows, i.e., the high luminous transmittance of Tlum > 60% and large solar modulating ability of ΔTsol > 10%, are competing to a large extent and hardly satisfied simultaneously. Here, we proposed a facile and universal method to prepare VO2 coatings for exceeding the criteria above using double-sided localized surface plasmon resonances (LSPRs), which are excited by the VO2 nanoparticles dispersed evenly on both surfaces of the fused silica substrate. With subtle engineering of the sol-gel and heat treatment processes, the morphology of as-prepared VO2 nanoparticles and corresponding LSPRs are controlled to achieve a high luminous transmittance (Tlum = 68.2%) and solar modulating ability (ΔTsol = 11.7%) simultaneously. Further simulation suggests that the double-sided LSPRs can collectively enhance the performance of VO2 smart coatings. Moreover, the double-sided VO2 nanoparticle coatings demonstrate stable performance with no more than 1% degradation of Tlum and ΔTsol after 1500 cycles. This study provides an alternative strategy to obtain high-quality VO2 (M) solar modulating coatings.
Collapse
Affiliation(s)
- Shuliang Dou
- National Key Laboratory of Science and Technology on Advanced Composites , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , People's Republic of China
| | - Jiupeng Zhao
- School of Chemical Engineering and Technology , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , People's Republic of China
| | - Weiyan Zhang
- School of Chemical Engineering and Technology , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , People's Republic of China
| | - Haipeng Zhao
- School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology , Soochow University , Suzhou , Jiangsu 215006 , People's Republic of China
| | - Feifei Ren
- School of Chemical Engineering and Technology , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , People's Republic of China
| | - Leipeng Zhang
- National Key Laboratory of Science and Technology on Advanced Composites , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , People's Republic of China
| | - Xi Chen
- National Key Laboratory of Science and Technology on Advanced Composites , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , People's Republic of China
| | - Yaohui Zhan
- School of Optoelectronic Science and Engineering and Collaborative Innovation Center of Suzhou Nano Science and Technology , Soochow University , Suzhou , Jiangsu 215006 , People's Republic of China
| | - Yao Li
- National Key Laboratory of Science and Technology on Advanced Composites , Harbin Institute of Technology , Harbin , Heilongjiang 150001 , People's Republic of China
| |
Collapse
|
21
|
Li X, Zhang L, Wang B, Xu G, Yu S, Pan M, Dou S, Li Y, Zhao J. Highly-conductive porous poly(ether ether ketone) electrolyte membranes for flexible electrochromic devices with variable infrared emittance. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2019.135357] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
22
|
Jiang W, Dou S, Li R, Zhang L, Zhu G. Efficacy and safety of anlotinib for patients with recurrent and/or metastatic salivary gland carcinomas. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz252.039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
23
|
Dou S, Wang X, Li R, Wu S, Ruan M, Yang W, Zhu G. Prospective Phase II Study of Concurrent Chemoradiotherapy in High-risk Malignant Salivary Gland Tumors. Int J Radiat Oncol Biol Phys 2019. [DOI: 10.1016/j.ijrobp.2019.06.292] [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: 10/26/2022]
|
24
|
Dou S, Li R, Xie L, Wang Z, Zhang C, Zhang L, Zhu G. PO-087 Apatinib combined with oral chemotherapy in patients with recurrent/metastatic head and neck cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30253-1] [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: 10/27/2022]
|
25
|
Zhang X, Dou S, Li W, Wang L, Qu H, Chen X, Zhang L, Zhao Y, Zhao J, Li Y. Preparation of monolayer hollow spherical tungsten oxide films with enhanced near infrared electrochromic performances. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2018.11.179] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
26
|
Lemaire M, Dou S, Cahu A, Romé V, Canlet C, Tremblay-Franco M, Rhimi M, Cuinet I, Le Ruyet P, Baudry C, Gérard P, Blat S, Le Huërou-Luron I. La matière grasse laitière et le probiotique L. fermentum CECT 5716 incorporés dans des formules infantiles programment la composition du microbiote et la fonction endocrine intestinale dans un modèle miniporc. NUTR CLIN METAB 2018. [DOI: 10.1016/j.nupar.2018.09.194] [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: 10/27/2022]
|
27
|
Zhu G, Li R, Dou S, Zhong L, Sun J, Zhang C. A Phase II Trial of Chemoradiation Using Weekly Docetaxel for High-Risk Postoperative Oral Squamous Cell Carcinoma Patients. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2018.06.137] [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: 11/28/2022]
|
28
|
Dou S, Zhang L, Li R, Zhu G. Phase 2 Study of Apatinib, A Novel VEGFR Inhibitor in Patients With Recurrent and/or Metastatic Adenoid Cystic Carcinoma of the Head and Neck: Preliminary Results. Int J Radiat Oncol Biol Phys 2018. [DOI: 10.1016/j.ijrobp.2017.12.184] [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]
|
29
|
Hua C, Dou S, Xu H, Hou S, Zhang H, Zhang P, Gan Y, Zhao J, Li Y. A nanostructured Fc(COCH 3) 2 film prepared using silica monolayer colloidal crystal templates and its electrochromic properties. Phys Chem Chem Phys 2017; 19:30756-30761. [PMID: 29130081 DOI: 10.1039/c7cp05074g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Since oxidation and reduction reactions mainly take place on surfaces, enlarging the specific surface of redox materials is the key to achieving excellent electrochemical performance. In this work, by using silica monolayer colloidal crystal templates (MCCTs), a nanostructured Fc(COCH3)2 film is prepared successfully, and such a nanostructure could exhibit the following unique electrochemical properties: the MCCTs could impede the aggregation tendency of Fc(COCH3)2 and possess high electrochemical activity; Fc(COCH3)2 enlarges the contact area and offers more active sites and faster electronic transmission channels. The structure, optical and electrochemical properties of the nanostructured Fc(COCH3)2 were tested and then compared with those of compact Fc(COCH3)2 films to evaluate the role of the nanoarchitecture. The unique structure design of the Fc(COCH3)2 film enables outstanding performance, showing a large transmittance change (ΔT) of 37% at 550 nm when switched between 0.5 V and -2.5 V, which is approximately ninefold higher than that of the compact Fc(COCH3)2 film (approximately 4%). Response times of coloration and bleaching are found to be only 16.15 s and 5.56 s. Furthermore, the nanostructured Fc(COCH3)2 film shows much better cycling stability than the compact one. The results indicate that the nanostructure could significantly improve the electrochemical performance of the Fc(COCH3)2 film due to the increase in electrochemical active sites and the enhancement of the "D-to-A" redox switch of ferrocene.
Collapse
Affiliation(s)
- Chunxia Hua
- School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001, Harbin, China.
| | | | | | | | | | | | | | | | | |
Collapse
|
30
|
Graziani F, Pujol A, Nicoletti C, Dou S, Maresca M, Giardina T, Fons M, Perrier J. Ruminococcus gnavus E1 modulates mucin expression and intestinal glycosylation. J Appl Microbiol 2016; 120:1403-17. [PMID: 26868655 DOI: 10.1111/jam.13095] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2015] [Revised: 01/15/2016] [Accepted: 02/07/2016] [Indexed: 12/16/2022]
Abstract
AIMS The molecular cross-talk between commensal bacteria and the gut play an important role in the maintenance of the intestinal homeostasis and general health. Here, we studied the impact of a major Gram-positive anaerobic bacterium of the human gut microbiota, that is, Ruminococcus gnavus on the glycosylation pattern and the production of intestinal mucus by the goblet cells. METHODS AND RESULTS Our results showed that R. gnavus E1 specifically increases the expression and the glycosylation level of the intestinal glyco-conjugates by goblet cells in the colonic mucosa of mono-associated mice with R. gnavus E1 as well as in human HT29-MTX cells. Such an effect was mediated through induction of the level of mRNA encoding for the major intestinal gel-forming mucin such as MUC2 and various glycosyltransferase enzymes. CONCLUSIONS This study demonstrates for the first time that R. gnavus E1 possess the ability to modulate the glycosylation profile of the glyco-conjugate molecules and mucus in goblet cells. SIGNIFICANCE AND IMPACT OF THE STUDY Furthermore, we demonstrated that R. gnavus E1 modified specifically the glycosylation pattern and MUC2 expression by means of a small soluble factor of peptidic nature (<3 kDa) and heat stable in the HT29-MTX cell.
Collapse
Affiliation(s)
- F Graziani
- iSm2 UMR 7313, CNRS, Centrale Marseille, Aix Marseille Université, Marseille, France
| | - A Pujol
- iSm2 UMR 7313, CNRS, Centrale Marseille, Aix Marseille Université, Marseille, France
| | - C Nicoletti
- iSm2 UMR 7313, CNRS, Centrale Marseille, Aix Marseille Université, Marseille, France
| | - S Dou
- UP 2012.10.120.EGEAL, Institut Polytechnique, La Salle Beauvais, France
| | - M Maresca
- iSm2 UMR 7313, CNRS, Centrale Marseille, Aix Marseille Université, Marseille, France
| | - T Giardina
- iSm2 UMR 7313, CNRS, Centrale Marseille, Aix Marseille Université, Marseille, France
| | - M Fons
- IMM UMR 7283, CNRS, Aix Marseille Université, Marseille, France
| | - J Perrier
- iSm2 UMR 7313, CNRS, Centrale Marseille, Aix Marseille Université, Marseille, France
| |
Collapse
|
31
|
Xiao F, Zhu G, Qian W, Liang F, Dou S, Kong L, WANG X, Hu C. Omitting Lower Neck and Sparing Glottis Larynx in Node Negative Nasopharyngeal Carcinoma (NPC) Improves Patient Reported Voice Outcomes. Int J Radiat Oncol Biol Phys 2015. [DOI: 10.1016/j.ijrobp.2015.07.1785] [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: 10/22/2022]
|
32
|
Xu T, Liu Y, Dou S, Li F, Guan X, Zhu G. Weekly cetuximab concurrent with IMRT aggravated radiation-induced oral mucositis in locally advanced nasopharyngeal carcinoma: Results of a randomized phase II study. Oral Oncol 2015; 51:875-9. [DOI: 10.1016/j.oraloncology.2015.06.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 06/15/2015] [Accepted: 06/22/2015] [Indexed: 11/28/2022]
|
33
|
Liu G, Dou S, Pretorius PH, Liu X, Chen L, Rusckowski M, Hnatowich DJ. Tumor pretargeting in mice using MORF conjugated CC49 antibody and radiolabeled complimentary cMORF effector. Q J Nucl Med Mol Imaging 2010; 54:333-340. [PMID: 20639818 PMCID: PMC2939249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
AIM Using the antiCEA antibody MN14, a LS174T mouse tumor model has been successfully targeted with (⁹⁹m)Tc for imaging and ¹⁸⁸Re for radiotherapy by phosphorodiamidate morpholino oligomers (MORF)/complementary MORF (cMORF) pretargeting strategy. This investigation evaluated the antiTAG-72 antibody CC49 as an alternative to MN14 for this application. METHODS Both CC49 and MN14 were labeled with ¹¹¹In via SCN-benzyl-DTPA and their biodistributions were compared to that of MN14 labeled via DTPA anhydride. Since the accessibility of the antibody to the effector is required for optimization of pretargeting, the internalization of both MORF-CC49 and MORF-MN14 antibodies in LS174T cells were evaluated in culture. In addition, the accessible concentration of MORF-CC49 antibody in tumor was determined in a series of pretargeting studies with escalating dosages of the [(⁹⁹m)Tc]cMORF effector. Finally, using these results and our semi-empirical model, an imaging study was performed under optimal pretargeting conditions. RESULTS The biodistribution of ¹¹¹In to trace the MN14 antibody depended significantly on the labeling method. Furthermore, both MORF-CC49 and MORF-MN14 antibodies showed rapid internalization in culture. Fortunately, the accessibility in tumor was found to be less seriously reduced in vivo. In a pretargeting study under optimal conditions, both by imaging and by necropsy, the [(⁹⁹m)Tc]cMORF effector accumulated predominantly in the tumor of pretargeted mice. Normal tissue accumulations were minimal except in kidneys, liver, and a segment of intestines. CONCLUSION MORF pretargeting with CC49 was equally successful in the LS174T tumor model to the MORF pretargeting with MN14. The MORF-CC49 antibody may therefore be considered for future investigations toward early clinical trials.
Collapse
Affiliation(s)
- G Liu
- Division of Nuclear Medicine, Department of Radiology, University of Massachusetts Medical School, Worcester, MA 01655-0243, USA.
| | | | | | | | | | | | | |
Collapse
|
34
|
Bordi F, Cametti C, Sennato S, Zuzzi S, Dou S, Colby RH. Dielectric scaling in polyelectrolyte solutions with different solvent quality in the dilute concentration regime. Phys Chem Chem Phys 2006; 8:3653-8. [PMID: 16883394 DOI: 10.1039/b605624e] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [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: 11/21/2022]
Abstract
In this note, we present a set of radiowave dielectric spectroscopy measurements of two dilute, differently-charged polyelectrolyte solutions, under different solvent conditions. We have found that both the dielectric strength, Delta epsilon, and the relaxation time, tau(ion), of the dielectric relaxation process associated with the counterion polarization along a length scale of the order of the correlation length obey the scaling laws with the polyion concentration, according to the Ito model. This is verified with good accuracy independently of the quality of the solvent, which has been varied from poor to good solvent conditions. This finding supports evidence to the fact that, in dilute solutions, the counterion polarization is independent of the polyion concentration, in spite of what occurs at the semi-dilute concentrations.
Collapse
Affiliation(s)
- F Bordi
- Dipartimento di Fisica, Universita' di Roma La Sapienza, Piazzale A. Moro 5, I-00185, Rome, Italy
| | | | | | | | | | | |
Collapse
|
35
|
Bordi F, Cametti C, Gili T, Sennato S, Zuzzi S, Dou S, Colby RH. Solvent quality influence on the dielectric properties of polyelectrolyte solutions: a scaling approach. Phys Rev E Stat Nonlin Soft Matter Phys 2005; 72:031806. [PMID: 16241472 DOI: 10.1103/physreve.72.031806] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2005] [Indexed: 05/05/2023]
Abstract
The dielectric properties of polyelectrolytes in solvent of different quality have been measured in an extended frequency range and the dielectric parameters associated with the polarization induced by counterion fluctuation over some peculiar polyion lengths have been evaluated. Following the scaling theory of polyelectrolyte solutions and the recent models developed by Dobrynin and Rubinstein that explicitly take into account the quality of the solvent on the polyion chain conformation, we have reviewed and summarized a set of scaling laws that describe the dielectric behavior of these systems in the dilute and semidilute regime. Moreover, for poorer solvents, where theory of hydrophobic polyelectrolytes predicts, and computer simulation confirms, a particular chain structure consisting of partially collapsed monomers (beads) connected by monomer strings, we derived a scaling law. These predictions are compared with the results obtained from the dielectric parameters (the dielectric increment delta epsilon and the relaxation time tau(ion)) of the "intermediate" frequency relaxation of two partially charged polymers, which possess a carbon-based backbone for which water is a poor solvent and ethylene glycol is a good solvent. By varying the solvent composition (a water-ethylene glycol mixture), we have tuned the quality of the solvent, passing from poor to good condition and have observed the predicted scaling for all the systems investigated. These findings give a further support to the scaling theory of polyelectrolyte solutions and to the necklace model for hydrophobic polyelectrolytes in poor solvents.
Collapse
Affiliation(s)
- F Bordi
- Dipartimento di Fisica, Universita' di Roma La Sapienza Piazzale A. Moro 5, I-00185, Rome, Italy
| | | | | | | | | | | | | |
Collapse
|
36
|
Bordi F, Cametti C, Gili T, Sennato S, Zuzzi S, Dou S, Colby RH. Conductometric properties of linear polyelectrolytes in poor-solvent condition: The necklace model. J Chem Phys 2005; 122:234906. [PMID: 16008486 DOI: 10.1063/1.1931607] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present a set of low-frequency electrical conductivity measurements of solutions of differently charged, salt-free polyelectrolytes in poor- and in good-solvent conditions, in the semidilute concentration regime. The data have been analyzed and discussed in light of the necklace model for hydrophobic polyelectrolytes recently proposed by Dobrynin et al. [Macromolecules 29, 2974 (1996)] that predicts the chains to collapse into spheroidal cores connected by narrow strings. By varying the quality of the solvent, we have measured the polyion equivalent conductance lambda(p) in an extended concentration range in the semidilute regime and have demonstrated that this parameter is influenced by the polyion chain conformation, giving further support, when the poor-solvent condition prevails, to the picture of a string of electrostatic blobs. On the contrary, in good-solvent condition, the electrical conductivity data are in reasonable good agreement with the picture of an extended chain consisting of a collection of electrostatic blobs. These electrical conductivity measurements, in light of scaling theory, furnish new experimental support for the necklace model for hydrophobic polyions in poor solvents.
Collapse
Affiliation(s)
- F Bordi
- Dipartimento di Fisica, Universita' di Roma "La Sapienza," Piazzale A. Moro 5, I-00185 Rome, Italy
| | | | | | | | | | | | | |
Collapse
|
37
|
Abstract
Even though increased accumulations of radiolabeled antisense DNAs compared to control DNAs are becoming a routine observation in cultured tumor cells, trustworthy evidence of tumor targeting in vivo by an antisense mechanism remains elusive. The goal of this study was to obtain convincing evidence of antisense tumor targeting in nude mice by using two different tumors and both intratumoral (i.t.) and intravenous (i.v.) administration of radiolabeled antisense and control sense DNAs. Both the MDR++ cell line KB-G2 and its parent MDR+ cell line KB-31 were used in this study. The antisense (AS) DNA was directed against the AUG start codon of the MDR1 mRNA and, along with the sense (S) control DNA, was a uniform phosphorothioate administered naked. In previous cell culture studies from our laboratories, the accumulation of this AS DNA was strikingly high in KB-G2 cells and only average in KB-31 cells, a fact we attribute to the 1000-fold higher expression by RT-PCR of MDR1 mRNA in the former cell line. In this study, both DNAs were radiolabeled with (99m)Tc via MAG3 and administered i.t. or i.v. at 1 microg (100 microCi) per animal 24 h prior to sacrifice and dissection in mice bearing thigh tumors of about 1 g. Following i.t. administration, no statistically significant differences (Student's t test, p < 0.05, N = 4) between the AS and S DNA biodistributions in normal tissues were observed except in the KB-G2 mice in which muscle levels were lower for the S control. In contrast, tumor levels in the KB-G2 animals were significantly higher for the AS DNA vs S DNA (14.7 vs 8.5% ID/g) while this difference (8.6 vs 4.3% ID/g) was insignificant in the KB-31 animals. The whole body images obtained just prior to sacrifice clearly show improved targeting of AS DNA vs S DNA in the KB-G2 but not the KB-31 animals. Calculations based on these results show that about 60 000 AS DNAs accumulated specifically (i.e. AS DNA - S DNA) per KB-G2 tumor cell following i.t. administration. When administered i.v. rather than i.t., higher tumor levels in KB-G2 animals compared to KB-31 were not observed, most likely because of the lower dosage reaching the tumors. When the KB-G2 and KB-31 results are combined, no statistically significant differences between the AS and S DNA biodistributions in normal tissues were observed except in blood in which S DNA levels were higher and in spleen in which they were lower. In contrast, tumor levels were significantly higher for the AS DNA vs S DNA (0.100 vs 0.063% ID/g). Calculations based on these results show that about 400 AS DNAs accumulated specifically per tumor cell following i.v. administration. Therefore evidence for tumor targeting in vivo by an antisense mechanism has been obtained in that statistically higher tumor accumulations of the (99m)Tc-AS DNA were observed compared to the control (99m)Tc-S DNA both following i.t. and i.v. administrations. The successful localization of AS DNA in tumor demonstrates that in vivo AS targeting of tumor is feasible although improvements in tumor delivery and normal tissue clearance are needed for practical antisense imaging.
Collapse
Affiliation(s)
- K Nakamura
- Department of Radiology, Keio University School of Medicine, Tokyo, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Ma X, Dou S, Wright JA, Reich RA, Teeter LD, El Sahly HM, Awe RJ, Musser JM, Graviss EA. 5' dinucleotide repeat polymorphism of NRAMP1 and susceptibility to tuberculosis among Caucasian patients in Houston, Texas. Int J Tuberc Lung Dis 2002; 6:818-23. [PMID: 12234138] [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: 02/26/2023] Open
Abstract
SETTING Houston Tuberculosis Initiative (HTI) and Baylor College of Medicine, Houston, Texas. OBJECTIVE To further explore the association between the polymorphisms of NRAMP1 and human susceptibility/resistance to tuberculosis (TB), specifically to determine whether the reported association shown for blacks and Asians holds true for Caucasian populations. DESIGN In a case-control study, 135 adult Caucasian TB patients and 108 adult Caucasian HIV-seronegative non-TB controls were analyzed for the association between the polymorphisms in NRAMP1 gene and clinical TB. RESULTS Heterozygote at 5'(GT)n, a dinucleotide repeat polymorphism in the promoter of NRAMP1, was observed at significantly higher frequencies among HIV-negative patients with pulmonary TB (41.6%; OR 2.02; 95%CI 1.11-3.64), extra-pulmonary TB (66.7%; OR 4.80; 95%CI 1.34-17.15), and HIV-seropositive TB patients (50%; OR 3.77; 95%CI 1.33-10.66) in comparison with the controls (27.8%). Homozygotes (GT)(10,10) were over-represented among HIV-positive TB patients (18.2%; OR 6.86; 95%CI 1.55-30.21) compared to the controls (5.5%). CONCLUSION These findings suggest that the 5'(GT)n polymorphism of NRAMP1 modifies TB susceptibility in this Caucasian population, and could possibly be related to the site of infection among HIV-negative individuals and HIV-coinfected TB.
Collapse
Affiliation(s)
- X Ma
- Department of Pathology, Baylor College of Medicine, Houston, Texas 77030, USA
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Shi D, Li S, Dou S. [MRI diagnosis of painful ophthalmoplegia syndrome]. Zhonghua Yan Ke Za Zhi 2001; 37:40-2. [PMID: 11864388] [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: 02/23/2023]
Abstract
OBJECTIVE To study MRI appearances of painful ophthalmoplegia syndrome and provide image basis for clinical diagnosis of painful ophthalmoplegia syndrome. METHODS Seventeen cases with painful ophthalmoplegia syndrome diagnosed clinically were collected. MRI ordinary scan and gadolinium-diethylene triamine pentaacetic acid (Gd-DTPA) contrast fatty-restraint scan were performed on the orbit and cavernous sinus. RESULTS MRI appearances of painful ophthalmoplegia syndrome included patch or small nodule abnormal signal at the region of fissura orbitalis superior. The ipsilateral cavernous sinus was enlarged. The local lobus temporalis meninges close to the fissura orbitalis superior and cavernous sinus were invaded. MRI contrast fatty-restraint scan might clearly show the pathological changes. CONCLUSION MRI may provide image basis for the clinical diagnosis of painful ophthalmoplegia syndrome.
Collapse
Affiliation(s)
- D Shi
- Imaging Department, Henan Province People Hospital, Zhengzhou 450003, China
| | | | | |
Collapse
|
40
|
Webb CF, Smith EA, Medina KL, Buchanan KL, Smithson G, Dou S. Expression of bright at two distinct stages of B lymphocyte development. J Immunol 1998; 160:4747-54. [PMID: 9590220] [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] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The B cell regulator of Ig heavy chain transcription (Bright) is a DNA-binding protein that was originally discovered in a mature Ag-specific B cell line after stimulation with IL-5 and Ag. It binds to the intronic heavy chain enhancer and 5' of the V1 S107 family V(H) promoter. Several studies suggested that Bright may increase transcription of the heavy chain locus, and expression in cell lines was limited to those representing mature B cells. We have now analyzed normal hemopoietic tissues for the expression of Bright during B lymphocyte differentiation. We expected to find Bright expression in a subset of mature spleen cells, but also observed Bright in a subset of normal B lymphocytic progenitors in both adult bone marrow (BM) and in fetal liver as early as day 12 of gestation. Bright was also expressed in the small percentage of CD4(low) cells in the thymus that are newly arrived from the BM and are not yet committed to the T lymphocyte lineage, but was not observed at later stages of T cell differentiation in either the spleen or thymus. Bright mRNA was not detected in the immature B lymphocytes that initially populate the spleen after migration from the BM. In addition, new splice variants of Bright were observed in fetal tissues. Thus, Bright expression is highly regulated in normal murine lymphocytes and occurs both early and late during B cell differentiation. These findings may have important implications for the function of Bright in regulating Ig transcription.
Collapse
Affiliation(s)
- C F Webb
- Immunobiology and Cancer Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA.
| | | | | | | | | | | |
Collapse
|
41
|
Buchanan KL, Smith EA, Dou S, Corcoran LM, Webb CF. Family-specific differences in transcription efficiency of Ig heavy chain promoters. The Journal of Immunology 1997. [DOI: 10.4049/jimmunol.159.3.1247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Murine Ig variable region heavy chain genes (V(H)) are grouped into families based on coding sequence homology. We observed that the accompanying promoter sequences were also conserved in a family-specific manner. Remarkably, no one has directly compared the transcription efficiencies of V(H) genes from different families. Using an in vitro transcription system, we found that transcription efficiencies of different V(H) promoters differed by as much as 70-fold. These differences could be attributed to variation in the octamer-heptamer and TATA sequences, as well as to the presence or absence of initiator elements. The J558 family promoter exhibited the highest level of transcription and specifically interacted with an Oct-1 dimer not bound by other V(H) promoters. These data suggest that differential transcription and regulation of V(H) promoters could occur in vivo. The increased transcription efficiency of the J558 promoter relative to other V(H) promoters also presents a possible explanation for the abundance of J558 sterile transcripts observed before V(H)DJ(H) rearrangement.
Collapse
Affiliation(s)
- K L Buchanan
- Immunobiology and Cancer Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA
| | - E A Smith
- Immunobiology and Cancer Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA
| | - S Dou
- Immunobiology and Cancer Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA
| | - L M Corcoran
- Immunobiology and Cancer Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA
| | - C F Webb
- Immunobiology and Cancer Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA
| |
Collapse
|
42
|
Buchanan KL, Smith EA, Dou S, Corcoran LM, Webb CF. Family-specific differences in transcription efficiency of Ig heavy chain promoters. J Immunol 1997; 159:1247-54. [PMID: 9233620] [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] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Murine Ig variable region heavy chain genes (V(H)) are grouped into families based on coding sequence homology. We observed that the accompanying promoter sequences were also conserved in a family-specific manner. Remarkably, no one has directly compared the transcription efficiencies of V(H) genes from different families. Using an in vitro transcription system, we found that transcription efficiencies of different V(H) promoters differed by as much as 70-fold. These differences could be attributed to variation in the octamer-heptamer and TATA sequences, as well as to the presence or absence of initiator elements. The J558 family promoter exhibited the highest level of transcription and specifically interacted with an Oct-1 dimer not bound by other V(H) promoters. These data suggest that differential transcription and regulation of V(H) promoters could occur in vivo. The increased transcription efficiency of the J558 promoter relative to other V(H) promoters also presents a possible explanation for the abundance of J558 sterile transcripts observed before V(H)DJ(H) rearrangement.
Collapse
Affiliation(s)
- K L Buchanan
- Immunobiology and Cancer Research Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA
| | | | | | | | | |
Collapse
|
43
|
Abstract
While expression of functional heavy chain immunoglobulin mRNA requires rearrangement of variable (VH), diversity (D) and (JH) gene segments, these individual gene segments can be transcribed prior to their rearrangement. It has been proposed that the resulting germline, or sterile, transcripts play an important role in the rearrangement process because strong correlations between rearrangement frequency and sterile transcript levels have been observed in some studies. Murine VH genes have been grouped into families on the basis of coding sequence homology. VH families rearrange in a developmentally regulated manner, so that rearrangements of genes from several VH families are detected earlier than rearrangements of J558 family genes. Paradoxically, the only VH family for which sterile transcripts have been documented is the J558 family. We used RT-PCR analyses to ask whether sterile transcripts from other VH families could be detected in fetal liver samples prior to their rearrangement. While J558 family germline transcripts were easily detected, no sterile transcripts were observed from the S107 family. Our studies also revealed the ability of small quantities of degraded genomic DNA to nonspecifically prime cDNA synthesis, emphasizing the need for caution in interpreting RT-PCR data in which family-specific oligos are used for cDNA production. These results cast doubt on the idea that sterile transcripts are required for V(H)DJ(H) rearrangement.
Collapse
Affiliation(s)
- C F Webb
- Department of Immunobiology/Cancer, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA
| | | | | | | | | | | |
Collapse
|
44
|
Carlson KM, Dou S, Toshima K, Chi DD, Donis-Keller H. Three dinucleotide repeat polymorphisms closely linked to the RET protooncogene D10S1098, D10S1099 and D10S1100. Hum Mol Genet 1994; 3:1207. [PMID: 7981703 DOI: 10.1093/hmg/3.7.1207] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Affiliation(s)
- K M Carlson
- Division of Human Molecular Genetics, Washington University School of Medicine, St Louis, MO 63110
| | | | | | | | | |
Collapse
|
45
|
Dou S, Zeng X, Cortes P, Erdjument-Bromage H, Tempst P, Honjo T, Vales LD. The recombination signal sequence-binding protein RBP-2N functions as a transcriptional repressor. Mol Cell Biol 1994; 14:3310-9. [PMID: 8164682 PMCID: PMC358697 DOI: 10.1128/mcb.14.5.3310-3319.1994] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.9] [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: 01/29/2023] Open
Abstract
We have identified a cellular protein, RBP-2N, a presumed recombinase, as a repressor of transcription. Inhibition of transcription by RBP-2N was dependent on its DNA recognition site and was demonstrated in vitro and in vivo. This repression appears to be general, as transcription mediated by SP1 and Gal4/VP16 was inhibited by RBP-2N. The protein was purified to near homogeneity from human cells on the basis of its binding to a site present in the promoter of the adenovirus pIX gene. The DNA recognition sequence is 5'-TGGGAAAGAA, which is markedly different from the recombination signal sequence originally identified as the target site for this protein. The sequence of the purified protein is 97% identical with that published for the mouse RBP-2N protein. The reported homolog in Drosophila is Suppressor of Hairless. RBP-2N binding sites are present in a number of cellular and viral promoters, so RBP-2N may have a general role in transcriptional repression.
Collapse
Affiliation(s)
- S Dou
- Department of Biochemistry, Robert Wood Johnson Medical School, University of Medicine and Dentistry of New Jersey, Piscataway 08854-5635
| | | | | | | | | | | | | |
Collapse
|
46
|
Carlson KM, Dou S, Chi D, Scavarda N, Toshima K, Jackson CE, Wells SA, Goodfellow PJ, Donis-Keller H. Single missense mutation in the tyrosine kinase catalytic domain of the RET protooncogene is associated with multiple endocrine neoplasia type 2B. Proc Natl Acad Sci U S A 1994; 91:1579-83. [PMID: 7906417 PMCID: PMC43203 DOI: 10.1073/pnas.91.4.1579] [Citation(s) in RCA: 420] [Impact Index Per Article: 14.0] [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: 01/27/2023] Open
Abstract
Multiple endocrine neoplasia type 2B (MEN 2B) is a human cancer syndrome characterized by medullary thyroid carcinoma (MTC), pheochromocytomas, mucosal neuromas, ganglioneuromas of the intestinal tract, and skeletal and ophthalmic abnormalities. It appears both as an inherited disorder and as de novo disease. Sequence analysis of germ-line DNA from MEN 2B patients revealed the existence of the same point mutation in the RET protooncogene in 34 unrelated individuals. This sequence difference was not observed in 93 unaffected individuals, including the normal parents of 14 de novo MEN 2B patients. The mutation (ATG-->ACG) results in the replacement of methionine with threonine within the catalytic core region of the tyrosine kinase domain. We propose that this amino acid replacement effects substrate interactions and results in dominant oncogenic activity by the RET protein. Missense mutations in the extracellular ligand-binding domain of the RET protooncogene previously have been associated with two other disorders [MEN 2A and familial MTC (FMTC)] in which MTC is observed. MEN 2B represents the third form of heritable MTC known to be an allele of RET. Alterations in two different functional domains of the putative receptor protein tyrosine kinase are implicated in development of MTC.
Collapse
Affiliation(s)
- K M Carlson
- Department of Surgery, Washington University School of Medicine, St Louis, MO 63110
| | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Donis-Keller H, Dou S, Chi D, Carlson KM, Toshima K, Lairmore TC, Howe JR, Moley JF, Goodfellow P, Wells SA. Mutations in the RET proto-oncogene are associated with MEN 2A and FMTC. Hum Mol Genet 1993; 2:851-6. [PMID: 8103403 DOI: 10.1093/hmg/2.7.851] [Citation(s) in RCA: 760] [Impact Index Per Article: 24.5] [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: 01/28/2023] Open
Abstract
Multiple endocrine neoplasia type 2A (MEN 2A) and familial medullary thyroid carcinoma (FMTC) are dominantly inherited conditions which predispose to the development of endocrine neoplasia. Evidence is presented that sequence changes within the coding region of the RET proto-oncogene, a putative transmembrane tyrosine kinase, may be responsible for the development of neoplasia in these inherited disorders. Single strand conformational variants (SSCVs) in exons 7 and 8 of the RET proto-oncogene were identified in eight MEN 2A and four FMTC families. The variants were observed only in the DNA of individuals who were either affected or who had inherited the MEN2A or FMTC allele as determined by haplotyping experiments. The seven variants identified were sequenced directly. All involved point mutations within codons specifying cysteine residues, resulting in nonconservative amino acid changes. Six of the seven mutations are located in exon 7. A single mutation was found in exon 8. Variants were not detected in four MEN 2B families studied for all exon assays available, nor were they detectable in 16 cases of well documented sporadic medullary thyroid carcinoma or pheochromocytoma that were tested for exon 7 variants. Coinheritance of the mutations with disease and the physical and genetic proximity of the RET proto-oncogene provide evidence that RET is responsible for at least two of the three inherited forms of MEN 2. Neither the normal function, nor the ligand of RET are yet known. However, its apparent involvement in the development of these inherited forms of neoplasia as well as in papillary thyroid carcinoma suggest an important developmental or cell regulatory role for the protein.
Collapse
Affiliation(s)
- H Donis-Keller
- Division of Human Molecular Genetics, Washington University School of Medicine, St Louis, MO 63110
| | | | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Ball DW, Azzoli CG, Baylin SB, Chi D, Dou S, Donis-Keller H, Cumaraswamy A, Borges M, Nelkin BD. Identification of a human achaete-scute homolog highly expressed in neuroendocrine tumors. Proc Natl Acad Sci U S A 1993; 90:5648-52. [PMID: 8390674 PMCID: PMC46778 DOI: 10.1073/pnas.90.12.5648] [Citation(s) in RCA: 133] [Impact Index Per Article: 4.3] [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: 01/30/2023] Open
Abstract
Basic helix-loop-helix transcription factors of the achaete-scute family are instrumental in Drosophila neurosensory development and are candidate regulators of development in the mammalian central nervous system and neural crest. We report the isolation and initial characterization of a human achaete-scute homolog that is highly expressed in two neuroendocrine cancers, medullary thyroid cancer (MTC) and small cell lung cancer (SCLC). The human gene, which we have termed human achaete-scute homology 1 (hASH1), was cloned from a human MTC cDNA library. It encodes a predicted protein of 238 aa that is 95% homologous to mammalian achaete-scute homolog (MASH) 1, a rodent basic helix-loop-helix factor. The 57-residue basic helix-loop-helix domain is identical to that in the rodent gene, and the basic and helical regions, excluding the loop, are 72-80% identical to Drosophila achaete-scute family members. The proximal coding region of the hASH1 cDNA contains a striking 14-copy repeat of the triplet CAG that exhibits polymorphism in human genomic DNA. Thus, hASH1 is a candidate locus for disease-causing mutations via triplet repeat amplification. Analysis of rodent-human somatic cell hybrids permitted assignment of hASH1 to human chromosome 12. Northern blots revealed hASH1 transcripts in RNA from a human MTC cell line, two fresh MTC tumors, fetal brain, and three lines of human SCLC. In contrast, cultured lines of non-SCLC lung cancers and a panel of normal adult human tissues showed no detectable hASH1 transcripts. Expression of hASH1 may provide a useful marker for cancers with neuroendocrine features and may contribute to the differentiation and growth regulation of these cells.
Collapse
Affiliation(s)
- D W Ball
- Division of Endocrinology and Metabolism, Johns Hopkins University School of Medicine, Baltimore, MD 21231
| | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Howe JR, Lairmore TC, Veile R, Dou S, Wells SA, Donis-Keller H. Development of a sequence-tagged site for the centromere of chromosome 10: its use in cytogenetic and physical mapping. Hum Genet 1993; 91:199-204. [PMID: 8478002 DOI: 10.1007/bf00218256] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
We sequenced the alphoid centromere probe p alpha 10RP8 (D10Z1), aligned it to three published consensus sequences, and developed a sequence-tagged site (STS), sJRH-2, based upon oligonucleotide primers having two 3' mismatches with these consensus sequences. Polymerase chain reaction (PCR) amplification using genomic DNA from a somatic cell hybrid panel representing all human chromosomes demonstrated amplification from only those cell lines containing chromosome 10. Fluorescence in situ hybridization of the amplified product demonstrated intense and specific hybridization of the PCR product to 10p11.1-q11.1. A human genomic yeast artificial chromosome (YAC) library was screened using the sJRH-2 PCR assay, and five clones were identified. Sequence analysis of one chimeric clone (consisting of DNA segments derived from chromosomes 5p and 10cen) confirmed specificity of the STS for the centromere of chromosome 10. sJRH-2 provides a convenient cytogenetic marker for chromosome 10, which will also be useful for physical mapping of the pericentromeric region of chromosome 10, a region that harbors the gene(s) for three forms of multiple endocrine neoplasia (types 2A, 2B, and familial medullary thyroid carcinoma). The GenBank accession number for the p alpha 10RP8 sequence is X63622.
Collapse
Affiliation(s)
- J R Howe
- Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110
| | | | | | | | | | | |
Collapse
|
50
|
Lairmore TC, Dou S, Howe JR, Chi D, Carlson K, Veile R, Mishra SK, Wells SA, Donis-Keller H. A 1.5-megabase yeast artificial chromosome contig from human chromosome 10q11.2 connecting three genetic loci (RET, D10S94, and D10S102) closely linked to the MEN2A locus. Proc Natl Acad Sci U S A 1993; 90:492-6. [PMID: 8093642 PMCID: PMC45689 DOI: 10.1073/pnas.90.2.492] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [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: 01/28/2023] Open
Abstract
The genetic loci RET, D10S94, and D10S102 from human chromosome 10q11.2 are very closely linked to a locus responsible for the multiple endocrine neoplasia type 2 (MEN2A and MEN2B) and medullary thyroid carcinoma (MTC1) familial cancer syndromes. We have constructed a 1.5-megabase contig consisting of six genomic yeast artificial chromosome clones which include these loci and define their physical order. A critical crossover event has been identified within the map interval; this event places the MEN2A locus centromeric to D10S102 and defines the orientation of the physical map on the chromosome. The orientation of the contig and order of the markers are centromere-RET-D10S94-D10S102-telomere. In addition, a microsatellite repeat polymorphism with a heterozygosity of 71% at the RET locus and a restriction fragment length polymorphism with a heterozygosity of 42% detected by a lambda clone from the D10S94 locus have been developed for high-resolution genetic linkage mapping and predictive diagnostic testing. These data place three important markers on a contiguous physical map, narrow the MEN2 disease locus interval, and provide a framework for further candidate gene identification efforts. Placement of these genetic loci along a clone-based map and continued expansion of the contig will also facilitate efforts to determine the relationship of physical to genetic distance near the centromeres of human chromosomes.
Collapse
Affiliation(s)
- T C Lairmore
- Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110
| | | | | | | | | | | | | | | | | |
Collapse
|