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Sun J, Ni F, Gu J, Si M, Liu D, Zhang C, Shui X, Xiao P, Chen T. Entangled Mesh Hydrogels with Macroporous Topologies via Cryogelation for Rapid Atmospheric Water Harvesting. Adv Mater 2024:e2314175. [PMID: 38635920 DOI: 10.1002/adma.202314175] [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: 12/26/2023] [Revised: 04/01/2024] [Indexed: 04/20/2024]
Abstract
Sorption-based atmospheric water harvesting (SAWH) is a promising technology to alleviate freshwater scarcity. Recently, hygroscopic salt-hydrogel composites (HSHCs) have emerged as attractive candidates with their high water uptake, versatile designability, and scale-up fabrication. However, achieving high-performance SAWH applications for HSHCs has been challenging because of their sluggish kinetics, attributed to their limited mass transport properties. Herein, a universal network engineering of hydrogels using a cryogelation method is presented, significantly improving the SAWH kinetics of HSHCs. As a result of the entangled mesh confinements formed during cryogelation, a stable macroporous topology is attained and maintained within the obtained entangled-mesh hydrogels (EMHs), leading to significantly enhanced mass transport properties compared to conventional dense hydrogels (CDHs). With it, corresponding hygroscopic EMHs (HEMHs) simultaneously exhibit faster moisture sorption and solar-driven water desorption. Consequently, a rapid-cycling HEMHs-based harvester delivers a practical freshwater production of 2.85 Lwater kgsorbents -1 day-1 via continuous eight sorption/desorption cycles, outperforming other state-of-the-art hydrogel-based sorbents. Significantly, the generalizability of this strategy is validated by extending it to other hydrogels used in HSHCs. Overall, this work offers a new approach to efficiently address long-standing challenges of sluggish kinetics in current HSHCs, promoting them toward the next-generation SAWH applications.
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Affiliation(s)
- Jiajun Sun
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Feng Ni
- Max Planck Institute of Microstructure Physics, 06120, Halle (Saale), Germany
| | - Jincui Gu
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Muqing Si
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Depeng Liu
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chang Zhang
- School of Biological and Chemical Engineering, NingboTech University, Ningbo, 315100, China
| | - Xiaoxue Shui
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
| | - Peng Xiao
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tao Chen
- Key Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
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Wu B, Si M, Hua L, Zhang D, Li W, Zhao C, Lu W, Chen T. Cephalopod-Inspired Chemical-Gated Hydrogel Actuation Systems for Information 3D-Encoding Display. Adv Mater 2024:e2401659. [PMID: 38533903 DOI: 10.1002/adma.202401659] [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: 01/31/2024] [Revised: 03/14/2024] [Indexed: 03/28/2024]
Abstract
Cephalopods evolve the acetylcholine-gated actuation control function of their skin muscles, which enables their dynamic/static multimode display capacities for achieving perfectly spatial control over the colors/patterns on every inch of skin. Reproduction of artificial analogs that exhibit similar multimodal display is essential to reach advanced information three-dimensional (3D) encoding with higher security than the classic 2D-encoding strategy, but remains underdeveloped. The core difficulty is how to replicate such chemical-gated actuation control function into artificial soft actuating systems. Herein, this work proposes to develop azobenzene-functionalized poly(acrylamide) (PAAm) hydrogel systems, whose upper critical solution temperature (UCST) type actuation responsiveness can be intelligently programmed or even gated by the addition of hydrophilic α-cyclodextrin (α-CD) molecules for reversible association with pendant azobenzene moieties via supramolecular host-guest interactions. By employing such α-CD-gated hydrogel actuator as an analogue of cephalopods' skin muscle, biomimetic mechanically modulated multicolor fluorescent display systems are designed, which demonstrate a conceptually new α-CD-gated "thermal stimulation-hydrogel actuation-fluorescence output" display mechanism. Consequently, high-security 3D-encoding information carriers with an unprecedented combination of single-input multiple-output, dynamic/static dual-mode and spatially controlled display capacities are achieved. This bioinspired strategy brings functional-integrated features for artificial display systems and opens previously unidentified avenues for information security.
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Affiliation(s)
- Baoyi Wu
- Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Muqing Si
- Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Luqin Hua
- School of Materials Science & Chemical Engineering, Ningbo University, Ningbo, 315211, China
| | - Dong Zhang
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA
| | - Wanning Li
- Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Chuanzhuang Zhao
- School of Materials Science & Chemical Engineering, Ningbo University, Ningbo, 315211, China
| | - Wei Lu
- Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Tao Chen
- Laboratory of Advanced Marine Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, China
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Ye AL, Zhang H, Wu B, Lu H, Si M, Zhang K, Chen T. Hydrogel Rivet with Unidirectional Shape Morphing for Flexible Mechanical Assembly. Macromol Rapid Commun 2024; 45:e2300586. [PMID: 37972640 DOI: 10.1002/marc.202300586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2023] [Revised: 11/11/2023] [Indexed: 11/19/2023]
Abstract
Integrating diverse materials and functions into highly additive produce has piqued global interest due to the increasing demands of intelligent soft robotics. Nevertheless, existing assembly techniques, especially supramolecular assembly which heavily rely on precise chemical design and specific recognition, may prove inadequate when confronted with diverse external demands. Inspired by the traditional mechanical assembly, rivet connection, herein, a thermo-responsive hydrogel with unidirectional shape-morphing is fabricated and a stable mechanical assembly is constructed by emulating the rivet connection mechanism. This system employed poly(acrylamide-co-acrylic acid) [P(AAm-co-AAc)] to induce continuous swelling and hexylamine-modified polyvinyl alcohol (PVA-C6) as a molecular switch to control the swelling process. The hydrogel rivet, initially threaded through pre-fabricated hollows in two components. Subsequently, upon the disassociation of alkane chains the molecular switch would activate, inducing swelling and stable mechanical assembly via anchor structures. Moreover, to enhance the assembly strength, knots are introduced to enhance assembly strength, guiding localized stress release for programmed deformations. Additionally, the system can be remotely controlled using near-infrared light (NIR) by incorporating photo-thermal nanoparticles. This work presents a universal and efficient strategy for constructing stable mechanical assemblies without compromising overall softness, offering significant potential for the fabrication of integrated soft robots.
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Affiliation(s)
- April L Ye
- Ningbo Hanvos Kent School, Ningbo, 315200, China
- Georgia School Ningbo, Ningbo, 315000, China
| | - Haozhe Zhang
- Ningbo Hanvos Kent School, Ningbo, 315200, China
| | - Baoyi Wu
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang, 311121, China
| | - Huanhuan Lu
- College of Chemical Engineering, Ningbo Polytechnic, Ningbo, 315800, China
| | - Muqing Si
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang, 311121, China
| | - Kaihang Zhang
- Department of Engineering Mechanics, Zhejiang University, Hangzhou, 310027, China
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang, 311121, China
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Liu J, Fang C, Zhou Q, He L, Yu J, Li Y, Feng M, Pan M, Zhao L, Tang D, Li X, Tan B, An R, Zheng X, Si M, Zhang B, Li L, Kang X. 179O A phase II, open-label, single-arm study of QL1604 plus paclitaxel-cisplatin/carboplatin as first-line treatment in patients with recurrent or metastatic cervical cancer. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.10.215] [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: 12/07/2022] Open
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5
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Lu W, Si M, Le X, Chen T. Mimicking Color-Changing Organisms to Enable the Multicolors and Multifunctions of Smart Fluorescent Polymeric Hydrogels. Acc Chem Res 2022; 55:2291-2303. [PMID: 35899979 DOI: 10.1021/acs.accounts.2c00320] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Fluorescent polymer hydrogels (FPHs) are of significant interest for diverse emerging applications such as visualized sensing, smart display, camouflaging skins, soft actuators/robots, because they can synergize the features of classic fluorescent polymers and hydrogels. With great efforts in the past decades, the major challenge in this field has been believed to be not whether a given FPH of interest can be prepared but how to fabricate robust FPHs with multicolor tunability and multifunctional synergy. Such materials will conceptually minimize the contribution of passive materials to the mass and size of the final system, holding great potential to facilitate multiple applications. To this end, one promising way is to learn from the Nature that has superb capability to forge delicate or sometimes beyond-imagination materials. Chameleons and cephalopods serve as typical examples, which are famous for not only diverse skin color adaptability under changing environmental demands, but also synergistic skin color and body gesture changes to communicate, warn, camouflage, etc. Biological studies revealed their structural color-changing capacity derives from different types of skin chromatophores and their rational multilayer arrangement in under-skin tissues. Besides, their superb ability to heterogeneously integrate soft tissues with disparate functions into topology-optimized architectures has led to various multifunctional performances. Such natural strategies, if replicated and implemented in artificial systems, would significantly benefit and advance the development of robust FPHs for various applications.In this Account, we summarizes the key advances of smart FPHs mainly achieved by our groups. We start by introducing the unique hierarchical multilayer structures of skin chromatophores in structural color-changing reptiles, followed by an in-depth discussion on how a rational integration of bioinspiration and man-made design makes it possible to largely expand the fluorescence color-changing range of smart FPHs to almost cover the whole visible spectrum. Then, to closely mimic the multifunctional behaviors of chameleons and cephalopods, we further develop efficient strategies to introduce supramolecular interactions or heterogeneously integrating smart FPHs with other soft materials with disparate functions, producing a number of multifunctional fluorescent polymeric hydrogel systems. These robust FPHs can find many frontier applications, including bioinspired synergistic color/shape switchable hydrogel actuators/robots, smart systems with on-demand fluorescent patterning capacities for displaying or information encryption, as well as robust chemosensors for important food or environmental analytes. We expect that the discussion presented in this Account would promote better understanding of the discoloration systems in nature, and advance the development of bioinspired color-changing materials.
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Affiliation(s)
- Wei Lu
- Key Laboratory of Marine Materials and Related Technologies, Chinese Academy of Sciences, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
| | - Muqing Si
- Key Laboratory of Marine Materials and Related Technologies, Chinese Academy of Sciences, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
| | - Xiaoxia Le
- Key Laboratory of Marine Materials and Related Technologies, Chinese Academy of Sciences, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies, Chinese Academy of Sciences, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo 315201, China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China
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6
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Noly P, Sood V, Ohye R, Bouhout I, Aoronson K, Haft J, Pagani F, Si M, Tang P. Outcomes Following Simultaneous Heart-Liver Transplantation: An Analysis of Donor and Recipient Characteristics. J Heart Lung Transplant 2022. [DOI: 10.1016/j.healun.2022.01.196] [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: 11/25/2022] Open
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7
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Yin G, Huang J, Liu D, Li R, Wei S, Si M, Ni F, Zheng Y, Yang Q, Zhou R, Le X, Lu W, Chen T. Mechanochemical transformation of fluorescent hydrogel based on dynamic lanthanide-terpyridine coordination. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.03.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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8
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Shi H, Wu S, Si M, Wei S, Lin G, Liu H, Xie W, Lu W, Chen T. Cephalopod-Inspired Design of Photomechanically Modulated Display Systems for On-Demand Fluorescent Patterning. Adv Mater 2022; 34:e2107452. [PMID: 34695246 DOI: 10.1002/adma.202107452] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2021] [Revised: 10/14/2021] [Indexed: 05/07/2023]
Abstract
Cephalopods can display variable body color/patterns upon environmental stimulation via bioelectricity-controlled muscle contraction/expansion of skin chromatophores. However, it remains challenging to produce artificial display analogs that exhibit reversible and rapid switching between multiple expected luminescent patterns, although such systems are very appealing for many practical uses (e.g., data encryption). Inspired by the bioelectromechanical display tactic of cephalopods, in this work, a conceptually new photomechanically modulated fluorescent system that enables on-demand display of fluorescent patterns via a cascading stimulation-mechanical movement-optical output conduction mechanism is presented. Specifically, this biomimetic system comprises a customizable hollow display panel and a bottom-tethered photothermally responsive fluorescent actuator. Under NIR light, the photomechanically bending movements of the fluorescent actuator will immediately cover the hollow window of the display panel and synchronously manifest as the display of fluorescent patterns. Owing to its desirable time- and light-power-dependent actuating behaviors, diverse fluorescent patterns/information can be dynamically and reversibly displayed by facilely controlling this single remote NIR signal. This bioinspired strategy is universal and promising for fabricating on-demand fluorescent display platforms that combine a wide choice of fluorophores, remote control with high spatial/temporal precision, and especially single-input multiple-output features.
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Affiliation(s)
- Huihui Shi
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Shuangshuang Wu
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Muqing Si
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Shuxin Wei
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Guoqing Lin
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
| | - Hao Liu
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Weiping Xie
- Public Technology Service Center, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
| | - Wei Lu
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China
- School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, China
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9
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Wu S, Shi H, Lu W, Wei S, Shang H, Liu H, Si M, Le X, Yin G, Theato P, Chen T. Aggregation‐Induced Emissive Carbon Dots Gels for Octopus‐Inspired Shape/Color Synergistically Adjustable Actuators. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shuangshuang Wu
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Huihui Shi
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Wei Lu
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Shuxin Wei
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Hui Shang
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Hao Liu
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Muqing Si
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Xiaoxia Le
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Guangqiang Yin
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
| | - Patrick Theato
- Soft Matter Synthesis Laboratory Institute for Biological Interfaces III Karlsruhe Institute of Technology (KIT) Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
- Institute for Chemical Technology and Polymer Chemistry Karlsruhe Institute of Technology (KIT) Engesser Str. 18 76131 Karlsruhe Germany
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
- School of Chemical Sciences University of Chinese Academy of Sciences 19A Yuquan Road Beijing 100049 P. R. China
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10
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Wu S, Shi H, Lu W, Wei S, Shang H, Liu H, Si M, Le X, Yin G, Theato P, Chen T. Aggregation-Induced Emissive Carbon Dots Gels for Octopus-Inspired Shape/Color Synergistically Adjustable Actuators. Angew Chem Int Ed Engl 2021; 60:21890-21898. [PMID: 34312961 DOI: 10.1002/anie.202107281] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Indexed: 12/11/2022]
Abstract
Some living organisms such as the octopus have fantastic abilities to simultaneously swim away and alter body color/morphology for disguise and self-protection, especially when there is a threat perception. However, it is still quite challenging to construct artificial soft actuators with octopus-like synergistic shape/color change and directional locomotion behaviors, but such systems could enhance the functions of soft robotics dramatically. Herein, we proposed to utilize unique hydrophobic carbon dots (CDs) with rotatable surficial groups to construct the aggregation-induced emission (AIE) active glycol CDs polymer gel, which could be further employed to be interfacially bonded to an elastomer to produce anisotropic bilayer soft actuator. When putting the actuator on a water surface, glycol spontaneously diffused out from the gel layer to allow water intake, resulting in a color change from a blue dispersion fluorescence to red AIE and a shape deformation, as well as a large surface tension gradient that can promote its autonomous locomotion. Based on these findings, artificial soft swimming robots with octopus-like synergistic shape/color change and directional swimming motion were demonstrated. This study provides an elegant strategy to develop advanced multi-functional bio-inspired intelligent soft robotics.
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Affiliation(s)
- Shuangshuang Wu
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Huihui Shi
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Wei Lu
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Shuxin Wei
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Hui Shang
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Hao Liu
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Muqing Si
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Xiaoxia Le
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Guangqiang Yin
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
| | - Patrick Theato
- Soft Matter Synthesis Laboratory, Institute for Biological Interfaces III, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.,Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesser Str. 18, 76131, Karlsruhe, Germany
| | - Tao Chen
- Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P. R. China.,School of Chemical Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing, 100049, P. R. China
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11
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Avancena A, Peng D, Lee J, Si M, Schumacher K, Hutton D. Cost-Effectiveness of Immediate Ventricular Assist Device Implantation in Children with Inotrope-Dependent Heart Failure. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.1318] [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] Open
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12
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Fan MP, Si M, Li BJ, Hu GH, Hou Y, Yang W, Liu L, Tang B, Nie L. Cell therapy of a knee osteoarthritis rat model using precartilaginous stem cells. Eur Rev Med Pharmacol Sci 2019; 22:2119-2125. [PMID: 29687871 DOI: 10.26355/eurrev_201804_14745] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To explore the effect and mechanism of precartilaginous stem cells (PSCs) engraftment-inducing tissue repair in a knee osteoarthritis (OA) rat model. MATERIALS AND METHODS Knee osteoarthritis (OA) model was constructed in Sprague Dawley (SD) rats by partial removal of the medial meniscus of the right knee. PSCs were engrafted by injecting precartilaginous stem cells (PSCs) into the right knee cavity. At 4 and 8 weeks after model construction, the serum levels of interleukine (IL)-1β, tumor necrosis factor (TNF)-α, and IL-6 were assessed using enzyme-linked immunosorbent assay (ELISA). Hematoxylin-eosin (HE) staining was performed to assess the histopathology of synovial membrane and cartilage. Western blot analysis was used to assess Notch1, Bcl-2 and Bax levels in the articular cartilage. RESULTS At 4 and 8 weeks, OA rats demonstrated significantly higher IL-1β, TNF-α, and IL-6 levels than normal rats (p < 0.05), whereas PSCs treatment prominently attenuated IL-1β upregulation (p < 0.05). In OA rats, the number of chondrocytes dramatically decreased over time in OA rats, with disruption of chondrocytes organization and cell layers. PSCs alleviated the deterioration of cartilage, as evidenced by the relatively smooth articular surface, distinct tidemark and clear cell layers. The model and treatment groups demonstrated substantially higher Notch1 expression. The Bcl-2/Bax value in the OA rats was lower than the control group, while PSCs treatment led to increase in Bcl-2/Bax value. CONCLUSIONS PSCs treatment downregulated the expression of inflammatory cytokines, alleviating osteoarthritis in the knee of rats. Notch1 signaling pathway plays an important role in this ameliorating effect of PSCs treatment.
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Affiliation(s)
- M-P Fan
- Department of Orthopaedic Surgery, Qilu Hospital of Shandong University, Jinan, China.
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13
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Shi YK, Fang J, Zhang S, Liu Y, Wang L, Si M, Ge M, Geng H. Safety and efficacy of WX-0593 in ALK-positive or ROS1-positive non-small cell lung cancer. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz260.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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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14
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Xu Q, Si M, Zhang Z, Li Z, Jiang L, Huang H. Rational Side-Chain Amino Acid Substitution in Firefly Luciferase for Improved Thermostability. APPL BIOCHEM MICRO+ 2018. [DOI: 10.1134/s0003683819010204] [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: 12/07/2022]
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15
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Fan MP, Si M, Li BJ, Hu GH, Hou Y, Yang W, Liu L, Tang B, Nie L. Cell therapy of a knee osteoarthritis rat model using precartilaginous stem cells. Eur Rev Med Pharmacol Sci 2018. [PMID: 29687871 DOI: 10.26355/eurrev-201804-14745] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To explore the effect and mechanism of precartilaginous stem cells (PSCs) engraftment-inducing tissue repair in a knee osteoarthritis (OA) rat model. MATERIALS AND METHODS Knee osteoarthritis (OA) model was constructed in Sprague Dawley (SD) rats by partial removal of the medial meniscus of the right knee. PSCs were engrafted by injecting precartilaginous stem cells (PSCs) into the right knee cavity. At 4 and 8 weeks after model construction, the serum levels of interleukine (IL)-1β, tumor necrosis factor (TNF)-α, and IL-6 were assessed using enzyme-linked immunosorbent assay (ELISA). Hematoxylin-eosin (HE) staining was performed to assess the histopathology of synovial membrane and cartilage. Western blot analysis was used to assess Notch1, Bcl-2 and Bax levels in the articular cartilage. RESULTS At 4 and 8 weeks, OA rats demonstrated significantly higher IL-1β, TNF-α, and IL-6 levels than normal rats (p < 0.05), whereas PSCs treatment prominently attenuated IL-1β upregulation (p < 0.05). In OA rats, the number of chondrocytes dramatically decreased over time in OA rats, with disruption of chondrocytes organization and cell layers. PSCs alleviated the deterioration of cartilage, as evidenced by the relatively smooth articular surface, distinct tidemark and clear cell layers. The model and treatment groups demonstrated substantially higher Notch1 expression. The Bcl-2/Bax value in the OA rats was lower than the control group, while PSCs treatment led to increase in Bcl-2/Bax value. CONCLUSIONS PSCs treatment downregulated the expression of inflammatory cytokines, alleviating osteoarthritis in the knee of rats. Notch1 signaling pathway plays an important role in this ameliorating effect of PSCs treatment.
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Affiliation(s)
- M-P Fan
- Department of Orthopaedic Surgery, Qilu Hospital of Shandong University, Jinan, China.
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16
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Kong F, Hoshi T, Li S, Xu L, Ai B, Yan Z, Ding G, Si M. ASSOCIATION BETWEEN HEALTH STATUS AND LONG-TERM CARE NEEDS: A COHORT STUDY OF JAPANESE ELDERLY. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- F. Kong
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - T. Hoshi
- Tokyo Metropolitan University, Tokyo, Japan,
| | - S. Li
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - L. Xu
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - B. Ai
- Minzu University of China, Beijing, China,
| | - Z. Yan
- CDC of Zibo City, Zibo, China
| | - G. Ding
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
| | - M. Si
- Department of Social Medicine and Health Services Management, Shandong University, Jinan, Shandong, China,
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Hou Y, Nie L, Pan X, Si M, Han Y, Li J, Zhang H. Effectiveness and safety of Mobi-C for treatment of single-level cervical disc spondylosis. Bone Joint J 2016; 98-B:829-33. [PMID: 27235528 DOI: 10.1302/0301-620x.98b6.36381] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Accepted: 01/15/2016] [Indexed: 12/11/2022]
Abstract
Aims In order to evaluate the effectiveness of the Mobi-C implant in cervical disc degeneration, a randomised study was conducted, comparing the Mobi-C prosthesis arthroplasty with anterior cervical disc fusion (ACDF) in patients with single level cervical spondylosis. Patients and Methods From January 2008 to July 2009, 99 patients were enrolled and randomly divided into two groups, those having a Mobi-C implant (n = 51; 30 men, 21 women) and those undergoing ACDF (n = 48; 28 men, 20 women).The patients were followed up for five years, with the primary outcomes being the Japanese Orthopaedic Association score, visual analogue scale for pain and the incidence of further surgery. The secondary outcomes were the Neck Disability Index and range of movement (ROM) of the treated segment. Results The incidence of further surgery was found to be statistically significant between the two groups (p = 0.49), with seven ACDF patients requiring further surgery and only one Mobi-C patient requiring re-operation. There were significant differences (p < 0.001) between the two groups in the ROM of the treated segment. However, both Mobi-C surgery and ACDF surgery were effective in improving the patient’s clinical symptoms. Take home message: Mobi-C implant surgery is a safe alternative to ACDF surgery in cervical disc degeneration. Cite this article: Bone Joint J 2016;98-B:829–3.
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Affiliation(s)
- Y. Hou
- Qilu Hospital of Shandong University, 107
Wenhua W Road, Jinan, Shandong
250012, China
| | - L. Nie
- Qilu Hospital of Shandong University, 107
Wenhua W Road, Jinan, Shandong
250012, China
| | - X. Pan
- Qilu Hospital of Shandong University, 107
Wenhua W Road, Jinan, Shandong
250012, China
| | - M. Si
- Qilu Hospital of Shandong University, 107
Wenhua W Road, Jinan, Shandong
250012, China
| | - Y. Han
- Qilu Hospital of Shandong University, 107
Wenhua W Road, Jinan, Shandong
250012, China
| | - J. Li
- Qilu Hospital of Shandong University, 107
Wenhua W Road, Jinan, Shandong
250012, China
| | - H. Zhang
- Qilu Hospital of Shandong University, 107
Wenhua W Road, Jinan, Shandong
250012, China
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18
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Zhang W, Cheng L, Hou Y, Si M, Zhao YP, Nie L. Plumbagin Protects Against Spinal Cord Injury-induced Oxidative Stress and Inflammation in Wistar Rats through Nrf-2 Upregulation. Drug Res (Stuttg) 2014; 65:495-9. [PMID: 25243650 DOI: 10.1055/s-0034-1389950] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
BACKGROUND Spinal cord injury causes post-traumatic degeneration through series of biochemical events. This study aims to evaluate the possible protective mechanism of Plumbagin against Spinal cord injury induced oxidative stress and inflammation. Plumbagin is a potent antioxidant and shows anti-carcinogenic, anti-inflammatory and analgesic activities. However, its exact molecular mechanism of action has yet to be explored. METHODS We tested the effects of Plumbagin on spinal cord injury induced ROS generation and lipid peroxidation content in wistar rats. Additionally, the expression of 2 important transcription factors NF-κB and Nrf-2 was investigated. RESULTS Plumbagin treatment significantly ameliorated oxidative stress through inhibition of ROS and lipid peroxidation with a concomitant increase in antioxidant status. Western blot analysis revealed enhanced nuclear levels of Nrf-2, while NF-κB expression was suppressed during Plumbagin administration. Enzyme linked immunosorbent assay for pro-inflammatory cytokines (TNF-α, IL-1β) showed a significant downregulation followed by Plumbagin treatment in spinal cord injury rats. CONCLUSION Taken together, the data suggests potential and novel role of Plumbagin in cytoprotection by modulating NF-κB and Nrf-2 levels against spinal cord injury.
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Affiliation(s)
- W Zhang
- Department of Orthopedics, Qilu Hospital, Shandong University, Jinan, Shandong, China
| | - L Cheng
- Department of Orthopedics, Qilu Hospital, Shandong University, Jinan, Shandong, China
| | - Y Hou
- Department of Orthopedics, Qilu Hospital, Shandong University, Jinan, Shandong, China
| | - M Si
- Department of Orthopedics, Qilu Hospital, Shandong University, Jinan, Shandong, China
| | - Y-P Zhao
- Department of Orthopedics, Qilu Hospital, Shandong University, Jinan, Shandong, China
| | - L Nie
- Department of Orthopedics, Qilu Hospital, Shandong University, Jinan, Shandong, China
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19
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Zhang F, Mi Y, Qi JL, Li JW, Si M, Guan BC, Du XN, An HL, Zhang HL. Modulation of K(v)7 potassium channels by a novel opener pyrazolo[1,5-a]pyrimidin-7(4H)-one compound QO-58. Br J Pharmacol 2013; 168:1030-42. [PMID: 23013484 DOI: 10.1111/j.1476-5381.2012.02232.x] [Citation(s) in RCA: 27] [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] [Received: 05/17/2012] [Revised: 08/22/2012] [Accepted: 09/17/2012] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND AND PURPOSE Modulation of K(v)7/M channel function represents a relatively new strategy to treat neuronal excitability disorders such as epilepsy and neuropathic pain. We designed and synthesized a novel series of pyrazolo[1,5-a] pyrimidin-7(4H)-one compounds, which activate K(v)7 channels. Here, we characterized the effects of the lead compound, QO-58, on K(v)7 channels and investigated its mechanism of action. EXPERIMENTAL APPROACH A perforated whole-cell patch technique was used to record K(v)7 currents expressed in mammalian cell lines and M-type currents from rat dorsal root ganglion neurons. The effects of QO-58 in a rat model of neuropathic pain, chronic constriction injury (CCI) of the sciatic nerve, were also examined. KEY RESULTS QO-58 increased the current amplitudes, shifted the voltage-dependent activation curve in a more negative direction and slowed the deactivation of K(v)7.2/K(v)7.3 currents. QO-58 activated K(v)7.1, K(v)7.2, K(v)7.4 and K(v)7.3/K(v)7.5 channels with a more selective effect on K(v)7.2 and K(v)7.4, but little effect on K(v)7.3. The mechanism of QO-58's activation of K(v)7 channels was clearly distinct from that used by retigabine. A chain of amino acids, Val(224)Val(225)Tyr(226), in K(v)7.2 was important for QO-58 activation of this channel. QO-58 enhanced native neuronal M currents, resulting in depression of evoked action potentials. QO-58 also elevated the pain threshold of neuropathic pain in the sciatic nerve CCI model. CONCLUSIONS AND IMPLICATIONS The results indicate that QO-58 is a potent modulator of K(v)7 channels with a mechanism of action different from those of known K(v)7 openers. Hence, QO-58 shows potential as a treatment for diseases associated with neuronal hyperexcitability.
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Affiliation(s)
- F Zhang
- The Key Laboratory of Neural and Vascular Biology, Ministry of Education, Shijiazhuang, China.
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20
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Palermo E, Si M, Occhiogrosso R, Berndt C, Rudomen G, Rafailovich M. Effects of Supercritical Carbon Dioxide on Phase Homogeneity, Morphology, and Mechanical Properties of Poly(styrene-blend-ethylene-stat-vinyl acetate). Macromolecules 2005. [DOI: 10.1021/ma051335+] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [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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21
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Gelfer M, Burger C, Fadeev A, Sics I, Chu B, Hsiao BS, Heintz A, Kojo K, Hsu SL, Si M, Rafailovich M. Thermally induced phase transitions and morphological changes in organoclays. Langmuir 2004; 20:3746-58. [PMID: 15875410 DOI: 10.1021/la035361h] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Thermal transitions and morphological changes in Cloisite organoclays were investigated by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, and in situ simultaneous small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) over the temperature range of 30-260 degrees C. On the basis of DSC and FTIR results, the surfactant component in organoclays was found to undergo a melting-like order-disorder transition between 35 and 50 degrees C. The transition temperatures of the DSC peaks (Ttr) in the organoclays varied slightly with the surfactant content; however, they were significantly lower than the melting temperature of the free surfactant (dimethyldihydrotallowammonium chloride; Tm = 70 degrees C). FTIR results indicated that within the vicinity of Ttr, the gauche content increased significantly in the conformation of surfactant molecules, while WAXD results did not show any change in three-dimensional ordering. Multiple scattering peaks were observed in SAXS profiles. In the SAXS data acquired below Ttr, the second scattering peak was found to occur at an angle lower than twice that of the first peak position (i.e., nonequidistant scattering maxima). In the data acquired above Ttr, the second peak was found to shift toward the equidistant position (the most drastic shift was seen in the system with the highest surfactant content). Using a novel SAXS modeling technique, we suggest that the appearance of nonequidistant SAXS maxima could result from a bimodal layer thickness distribution of the organic layers in organoclays. The occurrence of the equidistant scattering profile above Ttr could be explained by the conversion of the bimodal distribution to the unimodal distribution, indicating a redistribution of the surfactant that is nonbounded to the clay surface. At temperatures above 190 degrees C, the scattering maxima gradually broadened and became nonequidistant again but having the second peak shifted toward a scattering angle higher than twice the first peak position. The changes in SAXS patterns above 190 degrees C could be attributed to the collapse of organic layers due to desorption and/or degradation of surfactant component, which was supported by the TGA data.
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Affiliation(s)
- M Gelfer
- Chemistry Department, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA
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Affiliation(s)
- P Ji
- Department of Surgery, Division of Transplantation, College of Medicine, University of California at Irvine, UCI Medical Center, 101 The City Drive, Orange, CA 92868, USA
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23
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Si M, Zhang P. [A comparison of SERS of positive and negative nano-silver adsorbing cation and anion molecule]. Guang Pu Xue Yu Guang Pu Fen Xi 2001; 21:501-502. [PMID: 12945273] [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: 05/24/2023]
Abstract
A study on the negative charge colloid of nano-silver particles with anion and cation molecules has been done. The results of the experiment show that the negative charge colloid of nano-silver particle has no SERS effect when anion molecule adsorbed on its surface. While the cation molecule in adsorbed on its surface the SERS effect is enhanced. The SERS effects are just opposite when the two molecules separately adsorbed on the surface of the positive colloid of nano-silver particles. The paper hypothesizes that strong SERS effect can be got by using proper colloid of nano-silver particles. It is practical to develop the use of SERS.
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Affiliation(s)
- M Si
- Department of Physics, Chuxiong Teachers College, 675000 Chuxiong
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Si M, Wu R, Zhang P. [The enhanced mechanism of Cl- to SERS in silver colloid]. Guang Pu Xue Yu Guang Pu Fen Xi 2001; 21:343-346. [PMID: 12947663] [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: 05/24/2023]
Abstract
The SERS is enhanced when KCl is added to silver colloid and cation molecule. The hypothesis supposed that Cl- bridged between nano-silver and molecule, as a result the molecule adsorbing on nano-silver surface is promoted and the SERS is therefore enhanced. The CN- and NH3 can be better adsorbed when they are added separately to the nano-silver particles, Cl- and anion molecule. The SERS reduces when CN- and NH3 are added separately to Cl-, anion molecule and silver colloid. The result is that the CN- and NH3 are so strong that they have replaced Cl- and anion molecules. Therefore the SERS reduces. This has proved the bridge role of Cl-.
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Affiliation(s)
- M Si
- Department of Physics, Chuxiong Teacher's College, 675000 Chuxiong
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Abstract
The regulation of heme oxygenase (HO) activity and its dependence on iron was studied in bovine aortic endothelial cells (BAEC) subjected to hypoxia-reoxygenation (H/R). HO activity was induced by hypoxia (10 h) and continued to increase during the reoxygenation phase. HO-1 protein levels were strongly induced by hypoxia from undetectable levels and remained elevated at least 8 h postreoxygenation. Addition of the Fe(3+) chelator desferrioxamine mesylate (DFO) or the Fe(2+) chelator o-phenanthroline during hypoxia alone or during the entire H/R period inhibited the induction of HO activity and HO-1 protein levels. However, DFO had no effect and o-phenanthroline had a partial inhibitory effect on HO activity and protein levels when added only during reoxygenation. Loading of BAEC with Fe(3+) enhanced the activation of the HO-1 gene by H/R, whereas loading with L-aminolevulinic acid, which stimulates heme synthesis, had little effect. These results suggest that chelatable iron participates in regulating HO expression during hypoxia.
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Affiliation(s)
- S W Ryter
- Department of Medicine, Southern Illinois University School of Medicine, Springfield, Illinois 62794, USA
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Abstract
Our goal was to determine whether bedrails could be removed safely on a geriatric rehabilitation unit. Staff attended in-services about bedrails, assessment, and possible alternatives. Residents in the study group were assessed by an interdisciplinary team, following which a determination was made about the use of bedrails or alternatives. Eighty percent of residents in the study group were free of bedrails, which suggests that bedrails can be safely removed from most short-stay nursing home rehabilitation residents.
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Affiliation(s)
- M Si
- Jewish Home and Hospital, New York, NY 10025, USA.
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27
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Kakkis JL, Ke B, Dawson S, Maggard M, Si M, Kaldas F, Cai W, Shau H, Seu P, Sauri H, Busuttil RW, Imagawa DK. Pravastatin increases survival and inhibits natural killer cell enhancement factor in liver transplanted rats. J Surg Res 1997; 69:393-8. [PMID: 9224413 DOI: 10.1006/jsre.1997.5107] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Pravastatin, a 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitor, has been shown to decrease the number of acute rejection episodes in cardiac and renal transplant patients. This study evaluates the effects of pravastatin on survival of rats following liver transplant and attempts to elucidate the mechanisms of these effects. Both survival and natural killer cell enhancing factor (NKEF) studies utilized Dark Agouti rats for donor livers transplanted into Brown Norway rats as recipients. All rats received daily low-dose cyclosporine (CsA) 2 mg/kg/day by gavage. The treated groups also received gavage doses of pravastatin, 20 mg/kg/day. Survival data were analyzed by the method of Kaplan-Meier and log-rank chi 2 tests for statistical significance. For NKEF evaluation, rats were sacrificed at varying time points; total RNA was extracted from the liver and hybridized with 32P-radiolabeled NKEF DNA probes in the Northern blot technique. Radiographs were quantitated using densitometry. Data were analyzed by two-way ANOVA. Actuarial survival was improved (P < < 0.05) in rats treated with pravastatin in addition to low-dose CsA (n = 41, CsA alone n = 74). Less fibrosis and chronic rejection was seen on histological section in the treated animal livers, P < 0.05, NKEF was seen maximally at Days 5-15 tapering off at Day 21. NKEF-a and NKEF-b levels were significantly decreased in the animals treated with CsA and pravastatin compared to CsA alone in the group of animals < 16 days postop (P < < 0.05). Pravastatin improves survival in rats following OLT and while the mechanism is still unknown, inhibition of natural killer cell enhancement factor may represent an alteration in the overall immune response.
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Affiliation(s)
- J L Kakkis
- Department of Surgery, Liver and Pancreas Transplantation, UCLA School of Medicine 90095-7054, USA.
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Zhou FQ, Si M, Li JX. [Revision on the type of leaf trace bundles of Cyperus rotundus L]. Zhongguo Zhong Yao Za Zhi 1993; 18:648-50, 702. [PMID: 8003224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- F Q Zhou
- Department of Traditional Chinese Pharmacy, Shandong College of TCM, Jinan
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29
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Si M, Rodstein M, Neufeld RR, Libow LS, Mulvihill M, Hsu MA. Orthostatic change in blood pressure in non-demented, ambulatory nursing home patients. Arch Gerontol Geriatr 1992; 14:123-9. [PMID: 15374397 DOI: 10.1016/0167-4943(92)90047-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/1991] [Revised: 10/18/1991] [Accepted: 11/07/1991] [Indexed: 11/22/2022]
Abstract
While postural hypotension was present in almost 20% of ambulatory patients of this long-term institution, associated symptoms were infrequent. A comparison of the groups with and without a history of falls in the prior year revealed no relationship to the presence of postural hypotension and no relationship to a number of medications which have been reported to be associated with orthostatic hypotension. Blood pressure readings should be obtained at 1,3 and 5 min after assuming the erect position as significant falls in blood pressure were found at each interval.
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Affiliation(s)
- M Si
- The Jewish Home and Hospital for Aged, New York, NY 10025, U.S.A
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30
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Wen Z, Si M. [The analysis of foreign bodies in the anterior chamber in 165 cases]. Yan Ke Xue Bao 1990; 6:108-10. [PMID: 2101364] [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: 12/30/2022]
Abstract
One hundred and sixty-six eyes of 165 patients with foreign bodies in the anterior chamber who were treated at our center from 1966 to 1988 were retrospectively reviewed. Among them there were 109 eyes with nonmetal foreign bodies, 55 eyes with metal foreign bodies and three eyes with foreign bodies of unknown nature. Most of these foreign bodies were stone or iron. 83.6% of the patients were in the age range from 7 to 40 years, and the left eyes were affected more than the right eyes. Mostly, the foreign bodies were located on the surface of iris (97 cases) and at the anterior chamber angle (40 cases). The rates of blindness were 27.8% and 16.3% before and after operation. The postoperative visual acuity were: 0.05-0.2 in 27 eyes, 0.3-0.9 in 66 eyes, greater than 1.0 in 43 eyes and the rest of the eyes lower than 0.05. The presurgery treatment such as miosis and reduction of intraocular pressure, the selection of operative methods according to the nature, size, location of the foreign bodies and tissue wrapped up were discussed. If combined procedures should be done, it is better to remove the foreign bodies first and then perform the operation for complications.
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Affiliation(s)
- Z Wen
- Zhongshan Ophthalmic Center, Sun Yat-sen University of medical sciences, Guangzhou, China
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Wen X, Si M. [The analysis of foreign bodies in the anterior chamber in 165 cases]. Yan Ke Xue Bao 1990; 6:108-10. [PMID: 2289572] [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: 12/31/2022]
Abstract
One hundred and sixty-six eyes of 165 patients with foreign bodies in the anterior chamber who were treated at our center from 1966 to 1988 were retrospectively reviewed. Among them there were 109 eyes with nonmetal foreign bodies, 55 eyes with metal foreign bodies and three eyes with foreign bodies of unknown nature. Most of these foreign bodies were stone or iron. 83.6% of the patients were in the age range from 7 to 40 years, and the left eyes were affected more than the right eyes. Mostly, the foreign bodies were located on the surface of iris (97 cases) and at the anterior chamber angle (40 cases). The rates of blindness were 27.8% and 16.3% before and after operation. The postoperative visual acuity were: 0.05-0.2 in 27 eyes, 0.3-0.9 in 66 eyes, greater than 1.0 in 43 eyes and the rest of the eyes lower than 0.05. The presurgery treatment such as miosis and reduction of intraocular pressure, the selection of operative methods according to the nature, size, location of the foreign bodies and tissue wrapped up were discussed. If combined procedures should be done, it is better to remove the foreign bodies first and then perform the operation for complications.
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Affiliation(s)
- X Wen
- Zhongshan Ophthalmic Center, Sun Yat-sen University of medical sciences, Guangzhou, China
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