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Huang C, Yu J, Zhang CY, Cui Z, Chen J, Lai WH, Lei YJ, Nan B, Lu X, He R, Gong L, Li J, Li C, Qi X, Xue Q, Zhou JY, Qi X, Balcells L, Arbiol J, Cabot A. Electronic Spin Alignment within Homologous NiS 2/NiSe 2 Heterostructures to Promote Sulfur Redox Kinetics in Lithium-Sulfur Batteries. Adv Mater 2024:e2400810. [PMID: 38569213 DOI: 10.1002/adma.202400810] [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: 01/16/2024] [Revised: 03/08/2024] [Indexed: 04/05/2024]
Abstract
The catalytic activation of the Li-S reaction is fundamental to maximize the capacity and stability of Li-S batteries (LSBs). Current research on Li-S catalysts mainly focuses on optimizing the energy levels to promote adsorption and catalytic conversion, while frequently overlooking the electronic spin state influence on charge transfer and orbital interactions. Here, hollow NiS2/NiSe2 heterostructures encapsulated in a nitrogen-doped carbon matrix (NiS2/NiSe2@NC) are synthesized and used as a catalytic additive in sulfur cathodes. The NiS2/NiSe2 heterostructure promotes the spin splitting of the 3d orbital, driving the Ni3+ transformation from low to high spin. This high spin configuration raises the electronic energy level and activates the electronic state. This accelerates the charge transfer and optimizes the adsorption energy, lowering the reaction energy barrier of the polysulfides conversion. Benefiting from these characteristics, LSBs based on NiS2/NiSe2@NC/S cathodes exhibit high initial capacity (1458 mAh·g⁻1 at 0.1C), excellent rate capability (572 mAh·g⁻1 at 5C), and stable cycling with an average capacity decay rate of only 0.025% per cycle at 1C during 500 cycles. Even at high sulfur loadings (6.2 mg·cm⁻2), high initial capacities of 1173 mAh·g⁻1 (7.27 mAh·cm⁻2) are measured at 0.1C, and 1058 mAh·g⁻1 is retained after 300 cycles.
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Affiliation(s)
- Chen Huang
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
- Department of Chemistry, University of Barcelona, Barcelona, 08028, Spain
| | - Jing Yu
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona, Catalonia, 08193, Spain
| | - Chao Yue Zhang
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education & School of Physical Science & Technology, Lanzhou University, Lanzhou, 730000, China
| | - Zhibiao Cui
- School of Chemistry, South China Normal University, Guangzhou, 510006, P. R. China
| | - Jiakun Chen
- Analysis and Testing Center, South China Normal University, Guangzhou, 510006, China
| | - Wei-Hong Lai
- Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, Innovation Campus, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Yao-Jie Lei
- Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, Innovation Campus, University of Wollongong, Wollongong, NSW, 2500, Australia
| | - Bingfei Nan
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
| | - Xuan Lu
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
| | - Ren He
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
| | - Li Gong
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
- Department of Chemistry, University of Barcelona, Barcelona, 08028, Spain
| | - Junshan Li
- Institute for Advanced Study, Chengdu University, Chengdu, 610106, China
| | - Canhuang Li
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
- Department of Chemistry, University of Barcelona, Barcelona, 08028, Spain
| | - Xuede Qi
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400054, China
| | - Qian Xue
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400054, China
| | - Jin Yuan Zhou
- Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education & School of Physical Science & Technology, Lanzhou University, Lanzhou, 730000, China
| | - Xueqiang Qi
- College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing, 400054, China
| | - Lluís Balcells
- Institut de Ciència de Materials de Barcelona, Campus de la UAB, Bellaterra, Catalonia, 08193, Spain
| | - Jordi Arbiol
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, Barcelona, Catalonia, 08193, Spain
- ICREA Pg. Lluis Companys, Barcelona, Catalonia, 08010, Spain
| | - Andreu Cabot
- Catalonia Institute for Energy Research-IREC, Sant Adrià de Besòs, Barcelona, 08930, Spain
- ICREA Pg. Lluis Companys, Barcelona, Catalonia, 08010, Spain
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Kapuria N, Nan B, Adegoke TE, Bangert U, Cabot A, Singh S, Ryan KM. Colloidal Synthesis of Multinary Alkali-Metal Chalcogenides Containing Bi and Sb: An Emerging Class of I-V-VI 2 Nanocrystals with Tunable Composition and Interesting Properties. Chem Mater 2023; 35:4810-4820. [PMID: 37396682 PMCID: PMC10308588 DOI: 10.1021/acs.chemmater.3c00673] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 05/22/2023] [Indexed: 07/04/2023]
Abstract
The growth mechanism and synthetic controls for colloidal multinary metal chalcogenide nanocrystals (NCs) involving alkali metals and the pnictogen metals Sb and Bi are unknown. Sb and Bi are prone to form metallic nanocrystals that stay as impurities in the final product. Herein, we synthesize colloidal NaBi1-xSbxSe2-ySy NCs using amine-thiol-Se chemistry. We find that ternary NaBiSe2 NCs initiate with Bi0 nuclei and an amorphous intermediate nanoparticle formation that gradually transforms into NaBiSe2 upon Se addition. Furthermore, we extend our methods to substitute Sb in place of Bi and S in place of Se. Our findings show the initial quasi-cubic morphology transforms into a spherical shape upon increased Sb substitution, and the S incorporation promotes elongation along the <111> direction. We further investigate the thermoelectric transport properties of the Sb-substituted material displaying very low thermal conductivity and n-type transport behavior. Notably, the NaBi0.75Sb0.25Se2 material exhibits an ultralow thermal conductivity of 0.25 W·m-1·K-1 at 596 K with an average thermal conductivity of 0.35 W·m-1·K-1 between 358 and 596 K and a ZTmax of 0.24.
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Affiliation(s)
- Nilotpal Kapuria
- Department
of Chemical Sciences and Bernal Institute, University of Limerick, V94T9PX Limerick, Ireland
| | - Bingfei Nan
- Catalonia
Institute for Energy Research -IREC, 08930 Barcelona, Spain
- ICREA, 08010 Barcelona, Spain
| | - Temilade Esther Adegoke
- Department
of Chemical Sciences and Bernal Institute, University of Limerick, V94T9PX Limerick, Ireland
| | - Ursel Bangert
- Department
of Physics and Energy and Bernal Institute, University of Limerick, V94T9PX Limerick, Ireland
| | - Andreu Cabot
- Catalonia
Institute for Energy Research -IREC, 08930 Barcelona, Spain
- ICREA, 08010 Barcelona, Spain
| | - Shalini Singh
- Department
of Chemical Sciences and Bernal Institute, University of Limerick, V94T9PX Limerick, Ireland
| | - Kevin M. Ryan
- Department
of Chemical Sciences and Bernal Institute, University of Limerick, V94T9PX Limerick, Ireland
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3
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Xing C, Zhang Y, Xiao K, Han X, Liu Y, Nan B, Ramon MG, Lim KH, Li J, Arbiol J, Poudel B, Nozariasbmarz A, Li W, Ibáñez M, Cabot A. Thermoelectric Performance of Surface-Engineered Cu 1.5-xTe-Cu 2Se Nanocomposites. ACS Nano 2023; 17:8442-8452. [PMID: 37071412 DOI: 10.1021/acsnano.3c00495] [Citation(s) in RCA: 1] [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: 05/10/2023]
Abstract
Cu2-xS and Cu2-xSe have recently been reported as promising thermoelectric (TE) materials for medium-temperature applications. In contrast, Cu2-xTe, another member of the copper chalcogenide family, typically exhibits low Seebeck coefficients that limit its potential to achieve a superior thermoelectric figure of merit, zT, particularly in the low-temperature range where this material could be effective. To address this, we investigated the TE performance of Cu1.5-xTe-Cu2Se nanocomposites by consolidating surface-engineered Cu1.5Te nanocrystals. This surface engineering strategy allows for precise adjustment of Cu/Te ratios and results in a reversible phase transition at around 600 K in Cu1.5-xTe-Cu2Se nanocomposites, as systematically confirmed by in situ high-temperature X-ray diffraction combined with differential scanning calorimetry analysis. The phase transition leads to a conversion from metallic-like to semiconducting-like TE properties. Additionally, a layer of Cu2Se generated around Cu1.5-xTe nanoparticles effectively inhibits Cu1.5-xTe grain growth, minimizing thermal conductivity and decreasing hole concentration. These properties indicate that copper telluride based compounds have a promising thermoelectric potential, translated into a high dimensionless zT of 1.3 at 560 K.
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Affiliation(s)
- Congcong Xing
- Catalonia Energy Research Institute-IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Yu Zhang
- Catalonia Energy Research Institute-IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Ke Xiao
- Catalonia Energy Research Institute-IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain
- University of Barcelona, Martí i Franqués 1, 08028 Barcelona, Spain
| | - Xu Han
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
| | - Yu Liu
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, People's Republic of China
| | - Bingfei Nan
- Catalonia Energy Research Institute-IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain
- University of Barcelona, Martí i Franqués 1, 08028 Barcelona, Spain
| | - Maria Garcia Ramon
- Catalonia Energy Research Institute-IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain
- Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400 Klosterneuburg, Austria
| | - Khak Ho Lim
- Institute of Zhejiang University-Quzhou, 99 Zheda Rd., Quzhou 324000, Zhejiang, People's Republic of China
| | - Junshan Li
- Institute for Advanced Study, Chengdu University, 610106 Chengdu, People's Republic of China
| | - Jordi Arbiol
- Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Campus UAB, Bellaterra, 08193 Barcelona, Catalonia, Spain
- ICREA, Pg. Lluis Companys 23, 08010 Barcelona, Catalonia, Spain
| | - Bed Poudel
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Amin Nozariasbmarz
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Wenjie Li
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Maria Ibáñez
- Institute of Science and Technology Austria (ISTA), Am Campus 1, 3400 Klosterneuburg, Austria
| | - Andreu Cabot
- Catalonia Energy Research Institute-IREC, Sant Adrià de Besòs, 08930 Barcelona, Spain
- ICREA, Pg. Lluis Companys 23, 08010 Barcelona, Catalonia, Spain
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4
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Song X, Nan B, Li D, Lin Q, Sun X, Xue Y, Cao Q, Gui X, Xu K. Towards ambient temperature operation of Li metal batteries using UV-Crosslinked single-ion electrospun electrolytes. J Colloid Interface Sci 2023; 647:134-141. [PMID: 37247477 DOI: 10.1016/j.jcis.2023.05.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 04/19/2023] [Accepted: 05/03/2023] [Indexed: 05/31/2023]
Abstract
In spite of the fact that lithium metal batteries (LMBs) facilitate the diversification of energy storage technologies, their electrochemical reversibility and stability have long been constrained by side reactions and lithium dendrite problems. While single-ion conducting polymer electrolytes (SICPEs) possess unique advantages of suppressing Li dendrite growth, they deal with difficulties in practical applications due to their slow ion transport in general application scenarios at ∼25 °C. In this study, we develop novel bifunctional lithium salts with negative sulfonylimide (-SO2N(-)SO2-) anions mounted between two styrene reactive groups, which is capable of constructing 3D cross-linked networks with multiscale reticulated ion nanochannels, resulting in the uniform and rapid distribution of Li+ ions in the crosslinked electrolyte. To verify the feasibility of our strategy, we designed PVDF-HFP-based SICPEs and the obtained electrolyte exhibits high thermal stability, outstanding Li+ transference number (0.95), pleasing ionic conductivity (0.722 mS cm-1), and broad chemical window (greater than5.85 V) at ambient temperature. As a result of the electrolyte structural merits, the Li||LFP cells displayed excellent cycling stability (96.4% reversible capacities after 300 cycles at 0.2C) without additional auxiliary heating. This ingenious strategy is expected to providing a new perspective for advanced performance and high safety LMBs.
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Affiliation(s)
- Xuan Song
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China; The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Bingfei Nan
- Department of Physics, Universitat de Barcelona, 08028 Barcelona, Spain
| | - Dongxia Li
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiong Lin
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiangfeng Sun
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yuxin Xue
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qingbin Cao
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Xuefeng Gui
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Kai Xu
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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5
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Nan B, Song X, Chang C, Xiao K, Zhang Y, Yang L, Horta S, Li J, Lim KH, Ibáñez M, Cabot A. Bottom-Up Synthesis of SnTe-Based Thermoelectric Composites. ACS Appl Mater Interfaces 2023; 15:23380-23389. [PMID: 37141543 DOI: 10.1021/acsami.3c00625] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
There is a need for the development of lead-free thermoelectric materials for medium-/high-temperature applications. Here, we report a thiol-free tin telluride (SnTe) precursor that can be thermally decomposed to produce SnTe crystals with sizes ranging from tens to several hundreds of nanometers. We further engineer SnTe-Cu2SnTe3 nanocomposites with a homogeneous phase distribution by decomposing the liquid SnTe precursor containing a dispersion of Cu1.5Te colloidal nanoparticles. The presence of Cu within the SnTe and the segregated semimetallic Cu2SnTe3 phase effectively improves the electrical conductivity of SnTe while simultaneously reducing the lattice thermal conductivity without compromising the Seebeck coefficient. Overall, power factors up to 3.63 mW m-1 K-2 and thermoelectric figures of merit up to 1.04 are obtained at 823 K, which represent a 167% enhancement compared with pristine SnTe.
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Affiliation(s)
- Bingfei Nan
- Catalonia Institute for Energy Research─IREC, Sant Adrià de Besòs, Barcelona 08930, Spain
- Universitat de Barcelona, Martí i Franquès 1, Barcelona 08028, Spain
| | - Xuan Song
- The State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Cheng Chang
- Institute of Science and Technology Austria (ISTA), Am Campus 1, Klosterneuburg 3400, Austria
- School of Materials Science and Engineering, Beihang University, Beijing 100191, China
| | - Ke Xiao
- Catalonia Institute for Energy Research─IREC, Sant Adrià de Besòs, Barcelona 08930, Spain
- Universitat de Barcelona, Martí i Franquès 1, Barcelona 08028, Spain
| | - Yu Zhang
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, State College, Pennsylvania 16802, United States
| | - Linlin Yang
- Catalonia Institute for Energy Research─IREC, Sant Adrià de Besòs, Barcelona 08930, Spain
- Universitat de Barcelona, Martí i Franquès 1, Barcelona 08028, Spain
| | - Sharona Horta
- Institute of Science and Technology Austria (ISTA), Am Campus 1, Klosterneuburg 3400, Austria
| | - Junshan Li
- Institute of Advanced Study, Chengdu University, Chengdu 610106, China
| | - Khak Ho Lim
- Institute of Zhejiang University─Quzhou, 99 Zheda Rd, Quzhou 324000, Zhejiang, P. R. China
- College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Rd, Hangzhou 310007, Zhejiang, P. R. China
| | - Maria Ibáñez
- Institute of Science and Technology Austria (ISTA), Am Campus 1, Klosterneuburg 3400, Austria
| | - Andreu Cabot
- Catalonia Institute for Energy Research─IREC, Sant Adrià de Besòs, Barcelona 08930, Spain
- ICREA, Pg. Lluís Companys 23, Barcelona 08010, Catalonia, Spain
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6
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Nan B, Zhan Y, Xu CA. A review on the thermal conductivity properties of polymer/ nanodiamond nanocomposites. POLYM-PLAST TECH MAT 2023. [DOI: 10.1080/25740881.2022.2116343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Bingfei Nan
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, Peking, China
- Department of Electronic and Biomedical Engineering, Universitat de Barcelona, Barcelona Spain
| | - Yingjie Zhan
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, Peking, China
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, Kwangtung, China
| | - Chang-an Xu
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, Peking, China
- Guangzhou Institute of Chemistry, Chinese Academy of Sciences, Guangzhou, Kwangtung, China
- Key Laboratory for Bio-based Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou, Kwangtung, China
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7
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Zhan Y, Zheng X, Nan B, Lu M, Shi J, Wu K. Flexible MXene/aramid nanofiber nanocomposite film with high thermal conductivity and flame retardancy. Eur Polym J 2023. [DOI: 10.1016/j.eurpolymj.2023.111847] [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: 01/22/2023]
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8
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Zhan Y, Nan B, Zheng X, Lu M, Shi J, Wu K. Ma Lao-like structural fireproof aramid nanofiber@Ag nanocomposite film enhanced with MXene for advanced thermal management applications. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129370] [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: 11/16/2022]
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9
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Zheng H, Wu K, Chen W, Nan B, Qu Z, Lu M. High Intrinsic Thermal Conductivity of Polythiophene by Reducing Steric Hindrance and Enhancing p‐π Conjugation. MACROMOL CHEM PHYS 2021. [DOI: 10.1002/macp.202000418] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Haoting Zheng
- Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 P.R. China
- Guangdong Provincial Key Laboratory of Organic Polymer Materials for Electronics Guangzhou 510650 P.R. China
- CAS Engineering Laboratory for Special Fine Chemicals Guangzhou 510650 P.R. China
| | - Kun Wu
- Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 P.R. China
- University of Chinese Academy of Sciences Beijing 10049 P.R. China
| | - Weilong Chen
- Department of Chemistry City University of Hong Kong Hong Kong
| | - Bingfei Nan
- CASH GCC (Nanxiong) Research Institute of New Materials Co., Ltd Guangzhou 510650 P.R. China
| | - Zhencai Qu
- CAS Engineering Laboratory for Special Fine Chemicals Guangzhou 510650 P.R. China
| | - Mangeng Lu
- Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 P.R. China
- Department of Chemistry City University of Hong Kong Hong Kong
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Zhang E, Shi J, Xiao L, Zhang Q, Lu M, Nan B, Wu K, Lu M. A highly efficient bionic self-healing flexible waterborne polyurethane elastic film based on a cyclodextrin–ferrocene host–guest interaction. Polym Chem 2021. [DOI: 10.1039/d0py01480j] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Flexible WPU elastic films with superior self-healing based on synergic effects between host–guest interactions and hydrogen bonds.
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Affiliation(s)
- Ending Zhang
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Jun Shi
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Luqi Xiao
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Qiang Zhang
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Maoping Lu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Bingfei Nan
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Kun Wu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
| | - Mangeng Lu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- People's Republic of China
- University of Chinese Academy of Sciences
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11
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Nan B, Xiao L, Wu K, Xu CA, Zhang E, Zheng H, Zhan Y, Zhang Q, Shi J, Lu M. Covalently introducing amino-functionalized nanodiamond into waterborne polyurethane via in situ polymerization: Enhanced thermal conductivity and excellent electrical insulation. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124752] [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: 11/24/2022]
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Chappel-Farley MG, Nan B, Grill JD, Mander BA, Yassa MA, Benca RM. 0091 Sleep as a Mediator of the Relationship Between Exercise and Self-Reported Cognitive Function. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.089] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Introduction
Insufficient sleep and sedentary behavior are associated with cognitive decline. How sleep and physical activity interact to influence cognition is not fully understood. This study sought to examine whether self-reported sleep and exercise impact subjective cognitive complaints across adulthood.
Methods
Self-report questionnaire data from 2,744 adults (μ=56.18 yrs/old; 63.8% F; μ=16.36 yrs/edu) in the University of California Irvine Consent-to-Contact Registry were analyzed. Multiple regression models, analysis of covariance, and ordinary least squares path analysis were conducted to investigate relationships among the Cognitive Function Instrument (CFI), Medical Outcome Study Sleep Scale (MOS-SS) Subscales, and exercise frequency. All models adjusted for education, sex, age, BMI, medical comorbidities, depression, cancer diagnosis, and antidepressant usage. Individuals taking medications known to affect sleep or with a diagnosis major psychiatric illness were excluded from analyses.
Results
All MOS-SS Subscales significantly predicted CFI score (all p<0.001). Individuals who exercise >3times/week had significantly lower scores on the CFI (p<0.05), Sleep Problems Index I & II (both p<0.05), Somnolence Subscale (p<0.01), and higher scores on the Sleep Adequacy Subscale (p=0.001). Mediation analyses revealed that all subscales, aside from the Sleep Disturbance Subscale, mediated the relationship between exercise frequency and CFI Score (Bootstrapped CI’s did not include zero).
Conclusion
More self-reported sleep disturbance and greater daytime sleepiness are associated with more subjective cognitive complaints. Individuals who exercise more frequently report lower daytime sleepiness and higher quality sleep. The effects of exercise frequency on cognitive complaints appear to be mediated by the impact of exercise on sleep. These results suggest that sleep health may be a crucial consideration when evaluating outcomes of exercise-based therapies aimed at delaying the onset of cognitive impairment.
Support
The C2C registry was made possible by a donation from HCP, Inc. and is supported by NIA AG016573 and NCATS UL1 TR001414.
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Affiliation(s)
- M G Chappel-Farley
- Department of Neurobiology & Behavior, University of California Irvine, Irvine, CA
| | - B Nan
- Department of Statistics, University of California Irvine, Irvine, CA
| | - J D Grill
- Department of Psychiatry & Human Behavior, University of California Irvine, Irvine, CA
| | - B A Mander
- Department of Psychiatry & Human Behavior, University of California Irvine, Irvine, CA
| | - M A Yassa
- Department of Neurobiology & Behavior, University of California Irvine, Irvine, CA
| | - R M Benca
- Department of Psychiatry & Human Behavior, University of California Irvine, Irvine, CA
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Xu CA, Nan B, Lu M, Qu Z, Tan Z, Wu K, Shi J. Effects of polysiloxanes with different molecular weights on in vitro cytotoxicity and properties of polyurethane/cotton–cellulose nanofiber nanocomposite films. Polym Chem 2020. [DOI: 10.1039/d0py00809e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A series of polyurethane/cotton–cellulose nanofiber nanocomposite films are manufactured using amino-terminated polydimethylsiloxane, polycarbonate diol, isophorone diisocyanate, and dispersed cotton–cellulose nanofibers.
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Affiliation(s)
- Chang-An Xu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- PR China
- University of Chinese Academy of Sciences
| | - Bingfei Nan
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- PR China
- University of Chinese Academy of Sciences
| | - Mangeng Lu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- PR China
- University of Chinese Academy of Sciences
| | - Zhencai Qu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- PR China
- University of Chinese Academy of Sciences
| | - Zhiyou Tan
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- PR China
- University of Chinese Academy of Sciences
| | - Kun Wu
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- PR China
- University of Chinese Academy of Sciences
| | - Jun Shi
- Guangzhou Institute of Chemistry
- Chinese Academy of Sciences
- Guangzhou 510650
- PR China
- University of Chinese Academy of Sciences
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Hui Z, Men Y, Hu C, Zhou Z, Liang J, Feng Q, Nan B, Wang X, Chen D, Xiao Z, Lv J, Deng L, Zhang T, Wang W, Gao S, He J, Wang L. OA12.06 A Prospective Randomized Phase Ⅲ Study of Precise PORT for Patients with pⅢA-N2 NSCLC After Complete Resection and Adjuvant Chemotherapy. J Thorac Oncol 2019. [DOI: 10.1016/j.jtho.2019.08.475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Goodsitt M, Chan H, Watcharotone K, Nan B, Christodoulou E. SU-C-206-02: Estimating Coronary Artery Plaque Composition with a Combined Dual-Energy and Single-Energy QCT Optimization Model. Med Phys 2016. [DOI: 10.1118/1.4955584] [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: 11/07/2022] Open
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Kim C, Harlow SD, Karvonen-Gutierrez CA, Randolph JF, Helmuth M, Kong S, Nan B, Carlos R. Racial/ethnic differences in hepatic steatosis in a population-based cohort of post-menopausal women: the Michigan Study of Women's Health Across the Nation. Diabet Med 2013; 30:1433-41. [PMID: 23659546 PMCID: PMC3786038 DOI: 10.1111/dme.12225] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2012] [Revised: 04/11/2013] [Accepted: 05/07/2013] [Indexed: 12/20/2022]
Abstract
AIMS The prevalence of hepatic steatosis may differ between post-menopausal African-American women and non-Hispanic white women and by sex hormone binding globulin level. We examined prevalence of hepatic steatosis by race/ethnicity and associations with sex hormone binding globulin. METHODS Participants included post-menopausal women who underwent hepatic ultrasound (n = 345) at the Michigan site of the Study of Women's Health Across the Nation, a population-based study. We examined hepatic steatosis prevalence by race/ethnicity and used logistic regression models to calculate the odds of hepatic steatosis with race/ethnicity and sex hormone binding globulin, after adjustment for age, alcohol use, waist circumference, high density lipoprotein cholesterol, triglycerides, systolic blood pressure and use of medications reported to lower intrahepatic fat. RESULTS Fewer African-American women than non-Hispanic white women had hepatic steatosis (23 vs. 36%, P = 0.01). African-American women had lower triglyceride and low-density lipoprotein cholesterol levels, but higher blood pressure and follicle-stimulating hormone levels (P < 0.05). In the optimal-fitting multivariable models, women in the highest tertile of sex hormone binding globulin (60.2-220.3 nmol/l) had a lower odds of hepatic steatosis (odds ratio 0.43, 95% CI 0.20-0.93) compared with women in the lowest tertile of sex hormone binding globulin (10.5-40.3 nmol/l). There was an interaction between race/ethnicity and medication use whereby non-Hispanic white women using medications had three times higher odds of hepatic steatosis compared with African-American women not using medications (odds ratio 3.36, 95% CI 1.07-10.58). Interactions between race/ethnicity and other variables, including sex hormone levels, were not significant. CONCLUSIONS Hepatic steatosis on ultrasound may be more common in post-menopausal non-Hispanic white women than African-American women and was associated with lower levels of sex hormone binding globulin.
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Affiliation(s)
- C Kim
- Department of Medicine, Ann Arbor, MI, USA; Department of Obstetrics and Gynecology, Ann Arbor, MI, USA
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Little RJ, Yosef M, Nan B, Harlow SD. Little et al. Respond to "(Bio)marker Effectiveness". Am J Epidemiol 2011. [DOI: 10.1093/aje/kwr019] [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: 11/13/2022] Open
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Gilman S, Koeppe RA, Nan B, Wang CN, Wang X, Junck L, Chervin RD, Consens F, Bhaumik A. Cerebral cortical and subcortical cholinergic deficits in parkinsonian syndromes. Neurology 2010; 74:1416-23. [PMID: 20439843 DOI: 10.1212/wnl.0b013e3181dc1a55] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES Cholinergic projections to cerebral cortical and subcortical regions are decreased in Parkinson disease (PD), but not evaluated in the parkinsonian syndromes of multiple system atrophy (MSA-P) and progressive supranuclear palsy (PSP). We studied cholinergic innervation in these disorders as compared to age-appropriate normal control subjects. METHODS We used PET with [(11)C]PMP to measure acetylcholinesterase (AChE) activity in multiple cerebral cortical and subcortical regions. We studied 22 normal controls, 12 patients with PD, 13 patients with MSA-P, and 4 patients with PSP. RESULTS We found significantly decreased AChE activity in most cerebral cortical regions in PD and MSA-P, and a similar but nonsignificant decrease in PSP. No differences were found between PD and MSA-P. Significantly decreased AChE activity was found in PD in striatum, cerebellum, and thalamus, with a marginally significant decrease in mesencephalon and no change in pons. Significantly greater declines in AChE activity in all subcortical regions were seen in MSA-P and PSP vs in PD. Decreased AChE activity in brainstem and cerebellum of all 3 disorders correlated with disturbances of balance and gait. CONCLUSIONS Cerebral cortical cholinergic activity is decreased to a similar level in Parkinson disease (PD), parkinsonian syndromes of multiple system atrophy (MSA-P), and progressive supranuclear palsy (PSP) as compared to normal controls. Subcortical cholinergic activity is significantly more decreased in MSA-P and PSP than in PD. The more substantial decrease reflects greater impairment in the pontine cholinergic group, which is important in motor activity, particularly gait. These differences may account for the greater gait disturbances in the early stages of MSA-P and PSP than in PD.
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Affiliation(s)
- S Gilman
- Department of Neurology, University of Michigan Health System, Ann Arbor, USA.
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Sowers MFR, Zheng H, McConnell D, Nan B, Karvonen-Gutierrez CA, Randolph JF. Testosterone, sex hormone-binding globulin and free androgen index among adult women: chronological and ovarian aging. Hum Reprod 2009; 24:2276-85. [PMID: 19520711 DOI: 10.1093/humrep/dep209] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND In this study, levels and rates of change in total testosterone (T), sex hormone-binding globulin (SHBG) and free androgen index (FAI) were related to chronological age and to the final menstrual period (FMP) as an indicator of ovarian aging. METHODS Data were annually acquired over a 15-year period in 629 women of the Michigan Bone Health and Metabolism Study cohort. Data were censored for hormone therapy use. Endogenous androgen patterns over time were described with stochastic processes and bootstrapping. RESULTS With ovarian aging, T levels rose from a mean of 18 ng/dl commencing 10 years prior to the FMP to 27 ng/dl at the FMP. Over the 20-year period encompassing the FMP, modeled mean SHBG levels changed from 58 to 34 nM and the FAI ratio increased from 1.6 to 2.9 in a non-linear manner. With chronological aging, total T levels increased (P < 0.0001) from 43 to 50 years, but not thereafter. SHBG declined steadily with age with a modestly greater rate of change between 49 and 54 years. The FAI increased from 1.3 to 2.5 from 34 to 58 years. CONCLUSIONS T increased from approximately age 40 until the FMP whereas SHBG had rate of change patterns reflecting both chronological and ovarian aging components. These data provide new insight into the endogenous androgen patterns at mid-life.
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Affiliation(s)
- M F R Sowers
- Department of Epidemiology, School of Public Health, University of Michigan, 109 Observatory, Room 1846, Ann Arbor, MI 48109, USA.
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Kelly AM, Quint LE, Nan B, Zheng J, Cronin P, Deeb GM, Williams DM. Aortic growth rates in chronic aortic dissection. Clin Radiol 2007; 62:866-75. [PMID: 17662735 DOI: 10.1016/j.crad.2007.04.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2006] [Revised: 03/01/2007] [Accepted: 04/26/2007] [Indexed: 10/23/2022]
Abstract
AIM To determine and compare rates of descending aortic enlargement and complications in chronic aortic dissection with and without a proximal aortic graft. METHODS AND MATERIALS Fifty-two patients with dissection involving the descending aorta and who had undergone at least two computed tomography (CT) examinations at our institution between November, 1993 and February, 2004 were identified, including 24 non-operated patients (four type A, 20 type B) and 28 operated patients (type A). CT examinations per patient ranged from two to 10, and follow-up ranged from 1-123 months (mean 49 months, median 38.5 months). On each CT image, the aortic short axis (SA), false lumen (FL), and true lumen (TL) diameters were measured at the longitudinal midpoint of the dissection and at the point of maximum aortic diameter. Complications were tabulated, including aortic rupture and aortic enlargement requiring surgery. RESULTS For non-operated patients, the midpoint and maximum point SA, TL, and FL diameters increased significantly over time. For operated patients, the midpoint and maximum point SA and FL diameters increased significantly over time. In both groups, aortic enlargement was predominantly due to FL expansion. Diameter increases in non-operated patients were significantly larger than those in operated patients. The rate of change in aortic diameter was constant, regardless of aortic size. Four non-operated and six operated patients developed aortic complications. CONCLUSIONS In patients with a dissection involving the descending thoracic aorta, the FL increased in diameter over time, at a constant rate, and to a greater degree in non-operated patients (mostly type B) compared with operated patients (all type A).
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Affiliation(s)
- A M Kelly
- Department of Radiology, Division of Thoracic Radiology, University of Michigan Medical Center, Ann Arbor, Michigan, USA.
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Hughes M, Sundgren PC, Fan X, Foerster B, Nan B, Welsh RC, Williamson JA, Attwood J, Maly PV, Chenevert TL, McCune W, Gebarski S. Diffusion tensor imaging in patients with acute onset of neuropsychiatric systemic lupus erythematosus: a prospective study of apparent diffusion coefficient, fractional anisotropy values, and eigenvalues in different regions of the brain. Acta Radiol 2007; 48:213-22. [PMID: 17354144 DOI: 10.1080/02841850601105825] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
PURPOSE To investigate whether apparent diffusion coefficient (ADC), fractional anisotropy (FA), and eigenvalues in neuropsychiatric systemic lupus erythematosus (NPSLE) patients differ from those of healthy controls. MATERIAL AND METHODS Eight NPSLE patients (aged 23-55 years, mean 42.9 years) and 20 healthy age-matched controls (aged 22-59 years, mean 44.4 years) underwent conventional brain magnetic resonance (MR) and diffusion tensor imaging (DTI). The ADC, FA, principal eigenvalue (lambda parallel), and the corresponding average perpendicular eigenvalue (lambda perpendicular) (=(lambda2+lambda3)/2) were measured in selected regions of normal appearing gray and white matter brain parenchyma. For statistical evaluation of differences between the two groups, a Student's t-test was used. The P value for statistical significance was set to P=0.0025 after Bonferroni correction for multiple measurements. RESULTS Significantly increased ADC values were demonstrated in normal-appearing areas in the insular cortex (P<0.001), thalamus (P<0.001), and the parietal and frontal white matter (P<0.001 and P<0.001, respectively) in NPSLE patients. Significantly decreased FA values were demonstrated in normal-appearing thalamus (P<0.001), corpus callosum (P=0.002), and in the parietal and frontal white matter (P<0.001 and P<0.001, respectively) in NPSLE patients compared to healthy controls. The lambda perpendicular was significantly higher in several of these regions in NPSLE patients compared to healthy controls. CONCLUSION Our study demonstrates alterations in normal-appearing gray and white matter brain parenchyma of patients with NPSLE by means of abnormal ADC, FA, and eigenvalues. These alterations may be based on loss of tissue integrity in part due to demyelination. It is possible that DTI in the future could assist in the diagnosis of NPSLE and possibly help to further elucidate the pathogenesis of NPSLE.
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Affiliation(s)
- M Hughes
- Department of Radiology, School of Public Health, University of Michigan Health Systems, Ann Arbor, Michigan 48109, USA
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D Harlow S, Cain K, Crawford S, Dennerstein L, Little R, Mitchell ES, Nan B, Randolph J, Taffe J, Yosef M. The Restage Project: Evaluating Bleeding Criteria for Staging Reproductive Aging in Four Cohorts. Am J Epidemiol 2006. [DOI: 10.1093/aje/163.suppl_11.s153-a] [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: 11/15/2022] Open
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Chen C, Nan B, Lin P, Lumsden A, Yao Q. C-reactive protein increases plasminogen activator inhibitor-1 expression of human endothelial cells. J Surg Res 2006. [DOI: 10.1016/j.jss.2005.11.122] [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: 12/01/2022]
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Sundgren PC, Jennings J, Attwood JT, Nan B, Gebarski S, McCune WJ, Pang Y, Maly P. MRI and 2D-CSI MR spectroscopy of the brain in the evaluation of patients with acute onset of neuropsychiatric systemic lupus erythematosus. Neuroradiology 2005; 47:576-85. [PMID: 16007461 DOI: 10.1007/s00234-005-1371-y] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2004] [Accepted: 02/04/2005] [Indexed: 10/25/2022]
Abstract
MRI and 2D-CSI spectroscopy were performed in eight patients with systemic lupus erythematosus who presented with acute onset of neuropsychiatric lupus (NP-SLE), and in seven normal controls to evaluate for differences in metabolic peaks and metabolic ratios between the two groups. Also, the interval change of the metabolic peaks and their ratios during treatment in the NP-SLE patient group was evaluated. Metabolic peaks for N-acetyl-aspartate (NAA), choline (Cho), creatine (Cr), and lactate/lipids (LL) and their ratios (NAA/Cr, NAA/Cho, Cho/Cr, LL/Cr) were determined at initial presentation and 3 and 6 months later. In the eight lupus patients compared to the seven normal controls, NAA/Cho ratios were lower at presentation (1.05 vs 1.25; p = 0.004) and decreased even further at the three month follow-up (0.92 vs 1.05; p = 0.008). In contrast, both Cho/Cr (1.42 vs 1.26; p = 0.026) and LL/Cr ratios (0.26 vs 0.19; p = 0.002) were higher in the lupus patients at presentation compared to the controls and did not significantly change at three and six months follow-up. The NAA/Cr ratios were lower in the lupus patients compared to the controls at presentation but the difference was not statistically significant. However, the mean NAA/Cr significantly decreased from the initial examination to the three month follow-up (1.42 vs 1.32; p = 0.049) but did not significantly change from the three to the six month follow-up examinations. The NAA/Cr, Cho/Cr, and NAA/Cho ratios varied significantly (p < 0.05, p < 0.05, p < 0.05, respectively) between the 17 different locations measured in the brain in all eight patients and seven controls. Both the NAA/Cr ratios and the Cho/Cr ratios were also significantly lower in the gray matter than in the white matter (p < 0.0001) in both patients and controls, whereas the LL/Cr and NAA/Cho ratios were not significantly different. In conclusion, 2D-CSI MR spectroscopy may be useful in the early detection of metabolic CNS changes in NP-SLE patients with acute onset of new neurological symptoms as well as in the follow-up after treatment to assess presence and changes in metabolic brain injury. However, although there are detectable differences between normal individuals and lupus patients it is currently unclear whether these relate to the acute episode. Future studies are needed comparing NP-SLE patients with active CNS involvement with those inactive disease.
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Affiliation(s)
- P C Sundgren
- Department of Radiology, Division of Neuroradiology, University of Michigan Health Systems, Ann Arbor, MI 48104, USA.
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Yan S, Wang H, Nan B, Chai H, Yao Q, Chen C, Chen C. HIV protease inhibitor ritonavir increases monolayer permeability of endothelial cells. J Surg Res 2004. [DOI: 10.1016/j.jss.2004.07.176] [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: 11/29/2022]
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Nan B, Yan S, Chai H, Lin P, Yao Q, Chen C. TNF-α decreases expression of Thrombomudulin and endothelial protein C receptor in human endothelial cells. J Surg Res 2004. [DOI: 10.1016/j.jss.2004.07.077] [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: 11/16/2022]
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Abstract
To investigate whether the tumor suppressor gene PTEN affects the activity of the androgen receptor (AR), we monitored the expression of the apoptotic gene HA-Bax (inserted in an adenovirus where it is driven by the AR-responsive promoter ARR(2)PB) in the presence or absence of dihydrotestosterone, in PTEN (+) or (-) prostate cancer cell lines, infected with an adenovirus containing wild-type PTEN (Av-CMV-PTEN) or a control LacZ-expressing construct. Our results showed that AR transcriptional activity was antagonized by PTEN expression. This antagonism was not cell line dependent, as it was observed in both LNCaP and LAPC-4 cells, or promoter dependent, as it was observed for a reporter gene (HA-Bax) driven by an exogenous androgen-responsive promoter (the ARR(2)PB promoter), and for a native gene (prostate-specific antigen; PSA) driven by an endogenous AR-responsive promoter. Additional experiments performed with viruses containing constitutively active (Adeno-myrAkt) or dominant negative (Adeno-dnAkt) forms of Akt demonstrated that Akt, a protein kinase whose activation is known to be inhibited by PTEN, mediated the observed antagonism between PTEN and AR transcriptional activity. Recently, two putative Akt phosphorylation sites have been identified in the AR sequence. Site-directed mutagenesis was utilized to convert these two serine into alanine residues. The resulting construct, named CMV-AR S213A&S791A was transfected in AR (-) and PTEN (-) PC-3 cells in the presence or absence of Av-CMV-PTEN and of two reporter plasmids (GRE(2)E1b-Luc and PSA P/E-luc) containing the luciferase gene driven by well-characterized androgen responsive promoters. These experiments demonstrated that, similarly to the wild-type molecule, AR S213A&S791A was transcriptionally inhibited by PTEN, suggesting that Akt does not have an effect on AR transcription by direct phosphorylation, but probably by affecting the availability of a downstream molecule whose main mechanism of action is that of modulating AR transcription. The data presented here suggest that loss of PTEN function may facilitate activation of AR signaling and progression to androgen independence in prostate cancer.
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Affiliation(s)
- B Nan
- Department of Medicine, Baylor College of Medicine, Houston, Texas 77030, USA
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Le XF, Marcelli M, McWatters A, Nan B, Mills GB, O'Brian CA, Bast RC. Heregulin-induced apoptosis is mediated by down-regulation of Bcl-2 and activation of caspase-7 and is potentiated by impairment of protein kinase C alpha activity. Oncogene 2001; 20:8258-69. [PMID: 11781840 DOI: 10.1038/sj.onc.1205039] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2001] [Revised: 09/06/2001] [Accepted: 10/09/2001] [Indexed: 11/08/2022]
Abstract
Heregulins are a group of growth factors that play diverse and critical roles in the signaling network of the human epidermal growth factor receptor (HER or EGFR) superfamily. Our earlier studies have shown that recombinant heregulinbeta1 (HRG) induces apoptosis in SKBr3 breast cancer cells that overexpress HER2. Here we report molecular mechanisms of HRG-induced apoptosis. HRG treatment of SKBr3 cells for 72 h decreased the level of Bcl-2 protein. HRG treatment led to degradation of poly (ADP-ribose) polymerase (PARP) and activated both caspase-9 and caspase-7. No significant activation of caspase-3, -6, or -8 was detected. Expression of exogenous caspase-7 by adenovirus-caspase-7 (Ad-casp-7) in SKBr3 cells resulted in apoptosis, which mimicked the effect of HRG treatment. Expression of exogenous caspase-7 had no impact on Bcl-2 expression, but promoted PARP degradation. Two highly selective inhibitors of protein kinase C (PKC), GF109203X (GF) and Ro318425 (Ro), significantly enhanced HRG-induced apoptosis as determined by flow cytometric analysis and DNA fragmentation assay. Accordingly, the PKC inhibitor GF further decreased the level of Bcl-2 protein and further degraded PARP in HRG-treated cells. Assay of PKC activity indicated that HRG activated PKC in SKBr3 cells, predominantly affecting the PKCalpha isoform. To confirm which PKC isoform(s) mediated potentiation of HRG-induced apoptosis, the profile of PKC isoforms was measured in SKBr3 cells. Five PKC isoforms, PKCalpha, PKCiota, PKCzeta, PKClambda, and PKCdelta as well as their receptors (RACK1) were expressed in this cell line. Treatment with PKC inhibitors GF and Ro decreased protein levels of both PKCalpha and PKCdelta at 24 h. PKCalpha levels were still depressed at 72 h. GF and Ro had little effect on the expression of other PKC isoforms. An inhibitor of classical PKC isoforms (Go6976) enhanced HRG-induced apoptosis, whereas the PKCdelta selective inhibitor rottlerin did not. As PKCalpha was the only classical isoform expressed in SKBr3 cells, the effect of Go6976 on HRG-induced apoptosis largely related to inhibition of PKCalpha. Constitutive expression of wild-type PKCalpha attenuated the apoptosis produced by HRG and GF. Consequently, HRG-induced apoptosis in SKBr3 cells appeared to involve down-regulation of Bcl-2 protein, activation of caspase-9 and caspase-7, and degradation of PARP. Inhibition of PKC function enhanced HRG-induced apoptosis, leading to synergistic down-regulation of Bcl-2 expression. Impairment of the PKCalpha isoform alone was sufficient to potentiate HRG-induced apoptosis.
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Affiliation(s)
- X F Le
- Department of Experimental Therapeutics, The University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA
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Abstract
BACKGROUND Wilms tumor is one of the few pediatric cancers with well-defined familial and genetic components. The authors assessed the risk of early-onset cancers in first- and second-degree relatives of patients enrolled by the National Wilms Tumor Study Group. METHODS Using a stratified sampling scheme that targeted 530 families of patients who were believed a priori to have a genetic contribution to their disease, the authors conducted interviews regarding cancer occurrence in 4258 family members from 296 families of patients with Wilms tumor. Reports of malignant neoplasms that occurred before 55 years of age were confirmed by review of medical records wherever possible. A period of risk was defined for each family member based on calendar time and his or her relationship to the proband. RESULTS Ninety-nine cancers were observed, whereas 126.8 were expected by applying standard cancer rates for age and calendar period to the 120,885 person-years at risk. The standardized incidence ratio (SIR) was O-E = 0.78 with 95% confidence interval (CI) of (0.64, 0.95). In subgroup analyses, the highest relative risks were observed for parents of the index case (O/E = 21/13.0 = 1.6, 95% CI = 1.0, 2.5) and for leukemia (O/E = 9/4.9 = 1.9, 95% CI= 0.85,3.5). CONCLUSIONS The results of this study may provide reassurance to families of children who have had Wilms tumor. Potential sources of bias included the low (56%) rate of participation of targeted families. In general, the biases might have led to the underreporting of some cancers, especially in more distant relatives. The possibility of a slight excess of cancer in parents of Wilms tumor patients could not be excluded.
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Affiliation(s)
- J L Felgenhauer
- Department of Pediatrics, University of Washington, Seattle, Washington, USA.
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Andriani F, Nan B, Yu J, Li X, Weigel NL, McPhaul MJ, Kasper S, Kagawa S, Fang B, Matusik RJ, Denner L, Marcelli M. Use of the probasin promoter ARR2PB to express Bax in androgen receptor-positive prostate cancer cells. J Natl Cancer Inst 2001; 93:1314-24. [PMID: 11535706 DOI: 10.1093/jnci/93.17.1314] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [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: 11/12/2022] Open
Abstract
BACKGROUND Adenovirus-mediated overexpression of the apoptosis-inducing protein Bax can induce apoptosis in prostate cancer cell lines. Constitutive overexpression of Bax could result in unwanted apoptosis in every site of accidental Bax accumulation in vivo. Therefore, we developed an adenoviral construct (Av-ARR2PB-Bax) in which the probasin promoter, modified to contain two androgen response elements, drives Bax expression. This promoter would be expected to limit expression of Bax to cells expressing the androgen receptor. METHODS A variety of androgen receptor (AR)-positive and -negative cell lines of prostatic or nonprostatic origin were infected with Av-ARR2PB-Bax or a control virus, Av-ARR2PB-CAT, in which the same promoter drives expression of the chloramphenicol acetyl transferase-reporter gene. Bax expression and apoptosis in vitro were assessed by western blot analysis. Tumor size and apoptosis in vivo were assessed after four weekly injections of Av-ARR2PB-Bax or Av-ARR2PB-CAT into subcutaneous LNCaP xenografts growing in uncastrated male mice. All statistical tests were two-sided. RESULTS Bax was overexpressed in an androgen-dependent way in AR-positive cell lines of prostatic origin but not in AR-positive cells of nonprostatic origin or in AR-negative cell lines of either prostatic or nonprostatic origin. The androgen dihydrotestosterone activated apoptosis in LNCaP cells infected with Av-ARR2PB-Bax but not in those infected with Av-ARR2PB-CAT. Av-ARR2PB-Bax-injected LNCaP xenograft tumors decreased in tumor size from 34.1 mm3 (95% confidence interval [CI] = 25.1 mm3 to 43.1 mm3) to 24.6 mm3 (95% CI = -2.5 mm3 to 51.7 mm3), but the difference was not statistically significant (P =.5). Tumors injected with Av-ARR2PB-CAT increased in size, from 28.9 mm3 (95% CI = 12.7 mm3 to 45.1 mm3) to 206 mm3 (95% CI = 122 mm3 to 290 mm3) (P =.002) and contained statistically significant more apoptotic cells (23.3% [95% CI = 21.1% to 25.6%] versus 9.5% [95% CI = 8.0% to 11.1]) (P<.001). CONCLUSIONS Av-ARR2PB-Bax induces androgen-dependent therapeutic apoptosis in vitro and in vivo by activating apoptosis in AR-positive cells derived specifically from prostatic epithelium and does not affect nonprostatic cells.
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Affiliation(s)
- F Andriani
- Department of Medicine, Baylor College of Medicine, and VA Medical Center, Houston, TX 77030, USA
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Nan B, Getchell ML, Partin JV, Getchell TV. Leukemia inhibitory factor, interleukin-6, and their receptors are expressed transiently in the olfactory mucosa after target ablation. J Comp Neurol 2001; 435:60-77. [PMID: 11370011 DOI: 10.1002/cne.1193] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.6] [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: 11/09/2022]
Abstract
Removal of the synaptic targets of olfactory receptor neurons by olfactory bulb ablation results in apoptosis of olfactory receptor neurons and up-regulation of proliferation of their progenitors. This study focuses on the expression of the neuropoietic cytokines leukemia inhibitory factor (LIF) and its receptor (LIFR) and interleukin 6 (IL-6) and its receptor (IL-6R) in intercellular signaling pathways in the olfactory mucosa after target ablation. Olfactory bulbectomy (OBX) resulted in several transient, early-onset, temporally integrated events that were detected immunohistochemically. Macrophages infiltrated the olfactory epithelium (OE) by 16 hours post-OBX. LIF expression was up-regulated transiently at 2 days post-OBX, when up-regulated expression of LIFR also was detected on globose basal cells (GBCs), a subpopulation of which are immediate progenitors of olfactory receptor neurons. GBC proliferation peaked at 3--4 days post-OBX. In the olfactory nerve (ON), LIF-positive and IL-6-positive macrophage infiltration was followed by the transient up-regulation of expression of LIFR, IL-6, and IL-6R in ensheathing cells by 3 days post-OBX. The mRNAs for LIF/LIFR, IL-6/IL-6R, and their common signal-transduction molecule, gp130, in olfactory-nasal mucosa from control mice and from 3-day post-OBX mice were detected with reverse transcriptase-polymerase chain reaction (RT-PCR). Analysis of Northern blot and relative quantitative RT-PCR demonstrated similar temporal patterns of changes in relative mRNA levels for both LIF and IL-6, which were up-regulated by 16 hours post-OBX and peaked at 2--3 days post-OBX. These data indicate that LIF from infiltrating macrophages acts as a mitogen for GBCs and that LIF from infiltrating macrophages and IL-6 from infiltrating macrophages and ensheathing cells act as repair factors in the ON.
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Affiliation(s)
- B Nan
- Sanders-Brown Center on Aging, University of Kentucky College of Medicine, Lexington, Kentucky 40536, USA
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Green DM, Grigoriev YA, Nan B, Takashima JR, Norkool PA, D'Angio GJ, Breslow NE. Congestive heart failure after treatment for Wilms' tumor: a report from the National Wilms' Tumor Study group. J Clin Oncol 2001; 19:1926-34. [PMID: 11283124 DOI: 10.1200/jco.2001.19.7.1926] [Citation(s) in RCA: 207] [Impact Index Per Article: 9.0] [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: 11/20/2022] Open
Abstract
PURPOSE We determined the frequency of and risk factors for congestive heart failure following treatment for Wilms' tumor that included doxorubicin. PATIENTS AND METHODS Flow sheets and medical records were reviewed to identify cases of congestive heart failure in a cohort of patients treated on National Wilms' Tumor Studies (NWTS)-1, -2, -3, and -4. The frequency of congestive heart failure was estimated using the Kaplan-Meier method. A case-control study was conducted to determine the relationship among cumulative doxorubicin dose, site(s), total dose of abdominal and thoracic irradiation, sex, and the frequency of congestive heart failure. RESULTS The cumulative frequency of congestive heart failure was 4.4% at 20 years after diagnosis among patients treated initially with doxorubicin and 17.4% at 20 years after diagnosis among those treated with doxorubicin for their first or subsequent relapse of Wilms' tumor. The relative risk (RR) of congestive heart failure was increased in females (RR = 4.5; P =.004) and by cumulative doxorubicin dose (RR = 3.3/100 mg/m(2); P <.001), lung irradiation (RR = 1.6/10 Gy; P =.037), and left abdominal irradiation (RR = 1.8/10 Gy; P =.013). CONCLUSION We conclude that congestive heart failure is a risk of treatment with doxorubicin for Wilms' tumor. Additional follow-up of those children treated on NWTS-4 will be necessary to determine if the decrease in dose to 150 mg/m(2) significantly reduces this risk.
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Affiliation(s)
- D M Green
- Department of Pediatrics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA.
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Li X, Marani M, Yu J, Nan B, Roth JA, Kagawa S, Fang B, Denner L, Marcelli M. Adenovirus-mediated Bax overexpression for the induction of therapeutic apoptosis in prostate cancer. Cancer Res 2001; 61:186-91. [PMID: 11196158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Using adenoviral technology, we overexpressed the proapoptotic molecules pro-caspase-3, pro-caspase-7, and Bax to induce therapeutic apoptosis of prostate cancer cell lines growing in vitro and in vivo. Because overexpressed pro-caspase-3 did not undergo autocatalytic activation in any of the five prostate cancer cell lines evaluated, this strategy was unable to engage any component of the apoptotic pathway. Overexpressed pro-caspase-7 was proteolytically cleaved in LNCaP and LnCaP-Bcl-2 cells but not in PC-3, DU-145, or TsuPr(1) cells. Cleavage was associated with engagement of many components of the apoptotic pathway, including DEVDase activity, cleavage of intracellular caspase targets such as the DNA fragmentation factor and the proapoptotic Bid, release of cytochrome c from the mitochondria to the cytoplasm, and terminal deoxynucleotidyl transferase-mediated nick end labeling. No apoptosis was observed in the cells where caspase-7 did not undergo autocatalytic activation. Searching for an approach that would more reliably induce therapeutic apoptosis of prostate cancer cell lines, we used a binary adenoviral system to overexpress the proapoptotic molecule Bax. Bax was dramatically overexpressed and caused apoptosis of every cell line infected by engaging the mitochondrial pathway, including proteolytic cleavage and catalytic activation of the caspases, cleavage of caspase substrates, release of cytochrome c from the mitochondria, and DNA fragmentation. Furthermore, three injections of the Bax overexpression system into PC-3 cell tumors in nude mice in vivo caused a 25% regression in tumor size corresponding to a 90% reduction relative to continued tumor growth in animals that received injections with the control binary system expressing Lac-Z. These experiments show that adenovirus-mediated Bax overexpression is capable of inducing therapeutic programmed cell death in vitro and in vivo by activating the mitochondrial pathway of apoptosis. On the basis of these studies, we conclude that manipulation of Bax expression is an attractive new gene therapy approach for the treatment of prostate cancer.
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Affiliation(s)
- X Li
- Department of Medicine, Baylor College of Medicine and Veterans Affairs Medical Center, Houston, Texas 77030, USA
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