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Comparison of cytotoxicity and wound healing effect of carboxymethylcellulose and hyaluronic acid on human corneal epithelial cells

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International Journal of Ophthalmology(English edition) 2015年第2期8卷 215-221页

作者： jong Soo Lee Seung Uk Lee Cheng-Ye Che Ji-eun Lee Department of Ophthalmology School of MedicinePusan National University Biomedical Research Institute Pusan National University Hospital Department of Ophthalmology School of Medicine Kosin University Department of Ophthalmology the Affiliated Hospital of Medical College Qingdao University Research Institute for Convergence of Biomedical Science and Technology Pusan National University Yangsan Hospital

AIM: To investigate the cytotoxic effect on human corneal epithelial cells(HCECs) and the ability to faciliate corneal epithelial wound healing of carboxymethylcellulose(CMC) and hyaluronic acid(HA).METHODS: HCECs were exposed to 0.5% CMC(Refresh plus, Allergan, Irvine, California, USA) and 0.1% and 0.3%HA(Kynex , Alcon, Seoul, Korea, and Hyalein mini,Santen, Osaka, Japan) for the period of 30 min, and 4, 12,and 24 h. Methyl thiazolyl tetrazoiun(MTT)-based calorimetric assay was performed to assess the metabolic activity of cellular proliferation and lactate dehydrogenase(LDH) leakage assay to assess the cytotoxicity. apoptotic response was evaluated with flow cytometric analysis and fluorescence staining with Annexin V and propiodium iodide. Cellular morphology was evaluated by inverted phase-contrast light microscopy and electron microscopy. The wound widths were measured 24 h after confluent HCECs were scratch ***: The inhibitory effect of human corneal epithelial proliferation and cytotoxicity showed the time-dependent response but no significant effect. Apoptosis developed in flow cytometry and apoptotic cells weredemonstrated in fluorescent micrograph. The damaged HCECs were detached from the bottom of the dish and showed the well-developed vacuole formations. Both CMC and HA stimulated reepithehlialization of HCECs scratched, which were more observed in ***: CMC and HA, used in artificial tear formulation, could be utilized without any significant toxic effect on HCECs. Both significantly stimulated HCEC reepithelialization of corneal wounds.

关键词： carboxymethylcellulose corneal wound healing human corneal epithelial cells hyaluronic acid cytotoxicity

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Pyruvate dehydrogenase kinase is a negative regulator of interleukin-10 production in macrophages

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Journal of Molecular Cell Biology 2020年第7期12卷 543-555页

作者： Yi Rang Na Daun Jung Juha Song jong-Wan Park Jung joo Hong Seung Hyeok Seok Macrophage Lab Department of Microbiology and Immunology and Institute of Endemic DiseaseSeoul National University College of MedicineChongno-guSeoul 03080Republic of Korea Department of Biomedical Science BK21-Plus Education ProgramSeoul National University College ofMedicineJongno-guSeoul 03080Republic of Korea Department of Pharmacology Seoul National University College of MedicineJongno-guSeoul 03080Republic of Korea Cancer Research Institute and Ischemic/Hypoxic Disease Institute Seoul National University College ofMedicineJongno-guSeoul 03080Republic of Korea National Primate Research Center Korea Research Institute of Bioscience and BiotechnologyCheongju 28116Republic of Korea

Interleukin-10(IL-10)is the most potent anti-inflammatory cytokine in the body and plays an essential role in determining outcomes of many inflammatory *** metabolism is a critical determinant of immune cell function;however,it is currently unclear whether metabolic processes are specifically involved in IL-10 *** this study,we aimed to find the central metabolic molecule regulating IL-10 production of macrophages,which are the main producers of *** analysis identified that metabolic changes were predominantly enriched in Kupffer cells at the early inflammatory phase of a mouse endotoxemia *** them,pyruvate dehydrogenase kinase(PDK)-dependent acute glycolysis was negatively involved in IL-10 *** or knockdown of PDK selectively increased macrophage IL-10 ***,PDK inhibition increased IL-10 production via profound phosphorylation of adenosine monophosphate(AMP)-activated protein kinase alpha 1(AMPKα1)by restricting glucose uptake in lipopolysaccharide-stimulated ***α1 consequently activated p38 mitogen-activated protein kinase,c-Jun N-terminal kinase,and cyclic AMP-responsive element-binding protein to regulate IL-10 *** study uncovers a previously unknown regulatory mechanism of IL-10 in activated macrophages involving an immunometabolic function of PDK.

关键词： macrophage pyruvate dehydrogenase kinase AMP-activated protein kinase interleukin-10

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The complex of Fas-associated factor 1 with Hsp70 stabilizes the adherens junction integrity by suppressing RhoA activation

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Journal of Molecular Cell Biology 2022年第6期14卷 14-29页

作者： Soonhwa Song joon Kyu Park Sang Chui Shin Jae-Jin Lee Seung Kon Hong In-Kang Song Bokyung Kim eun joo Song Kong-joo Lee eunice eunKyeong Kim Graduate School of Pharmaceutical Sciences College of PharmacyEwha Womans UniversitySeoul 03760Republic of Korea Biomedical Research Institute Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Technology Support Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea

Fas-associated factor 1 (FAF1) is a scaffolding protein that plays multiple functions, and dysregulation of FAF1 is associated withmany types of diseases such as cancers. FAF1 contains multiple ubiquitin-related domains (UBA, UBL1, UBL2, UAS, and UBX), eachdomain interacting with a specific partner. In particular, the interaction of UBL1 with heat shock protein 70 (Hsp70) is associatedwith tumor formation, although the molecular understanding remains unknown. In this study, the structural analysis revealed thatHis160 of FAF1 is important for its interaction with Hsp70. The association of Hsp70 with FAF1 is required for the interaction withIQGAP1. FAF1 negatively regulates RhoA activation by FAF1–Hsp70 complex formation, which then interacts with IQGAP1. Thesesteps play a key role in maintaining the stability of cell-to-cell junction. We conclude that FAF1 plays a critical role in the structureand function of adherens junction during tissue homeostasis and morphogenesis by suppressing RhoA activation, which induces theactivation of Rho-associated protein kinase, phosphorylation of myosin light chain, formation of actin stress fiber, and disruptionof adherens junction. In addition, depletion of FAF1 increased collective invasion in a 3D spheroid cell culture. These results provideinsightinto how the FAF1–Hsp70 complex acts as a novelregulator ofthe adherens junction integrity. The complex can be a potentialtherapeutic target to inhibit tumorigenesis and metastasis.

关键词： human Fas-associated factor 1(FAF1) heat shock protein 70(Hsp70) adherens junction RhoA activation IQGAP1 X-ray crystallography FAF1–Hsp70 complex

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Time-dependent effect of combination therapy with erythropoietin and granulocyte colony-stimulating factor in a mouse model of hypoxic-ischemic brain injury

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Neuroscience Bulletin 2014年第1期30卷 107-117页

作者： Ji Hea Yu Jung Hwa Seo jong eun Lee Ji Hoe Heo Sung-Rae Cho Department and Research Institute of Rehabilitation Medicine Yonsei University College of Medicine Brain Korea 21 PLUS Project for Medical Science Yonsei University Graduate Program of Nano Science and Technology Yonsei University Department of Anatomy Yonsei University College of Medicine Department of Neurology Yonsei University College of Medicine Yonsei Stem Cell Center Avison Biomedical Research CenterYonsei University College of Medicine Rehabilitation Institute of Neuromuscular Disease Yonsei University College of Medicine

Erythropoietin （EPO） and granulocyte colony- stimulating factor （G-CSF） are likely to play broad roles in the brain. We investigated the effects of combination therapy with EPO and G-CSF in hypoxic- ischemic brain injury during the acute, subacute, and chronic phases. A total of 79 C57BL/6 mice with hypoxic-ischemic brain injury were randomly assigned acute （days 1-5）, subacute （days 11-15）and chronic （days 28-32） groups. All of them were treated with G-CSF （250 μg/kg） and EPO （5 000 U/kg） or saline daily for 5 consecutive days. Behavioral assessments and immunohistochemistry for angiogenesis, neuro- genesis, and astrogliosis were performed with an 8-week follow-up. Hypoxia-inducible factor-1 （HIF-1） was also measured by Western blot analysis. The results showed that the combination therapy with EPO and G-CSF in the acute phase significantly improved rotarod performance and forelimb-use symmetry compared to the other groups, while subacute EPO and G-CSF therapy exhibited a modest improvement compared with the chronic saline controls. The acute treatment significantly increased the density of CD31^＋（PECAM-1） and a-smooth muscle actin^＋ vessels in the frontal cortex and striatum, increased BrdU^＋/PSA- NCAM^＋ neurogenesis in the subventricular zone, and decreased astroglial density in the striatum. Furthermore, acute treatment significantly increased the HIF-1 expression in the cytosol and nucleus, whereas chronic treatment did not change the HIF-1 expression, consistent with the behavioral outcomes. These results indicate that the induction of HIF-1 expression by combination therapy with EPO and G-CSF synergistically enhances not only behavioral function but also neurogenesis and angiogenesis while decreasing the astroglial response in a time- dependent manner.

关键词： erythropoietin granulocyte colony-stimulating factor hypoxia-inducible factor-1 hypoxic-ischemic brain injury

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Foldable three dimensional neural electrode arrays for simultaneous brain interfacing of cortical surface and intracortical multilayers

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npj Flexible Electronics 2022年第1期6卷 840-853页

作者： Ju Young Lee Sang Hoon Park Yujin Kim Young Uk Cho Jaejin Park Jung-Hoon Hong Kyubeen Kim jongwoon Shin Jeong eun Ju In Sik Min Mingyu Sang Hyogeun Shin Ui-Jin Jeong Yuyan Gao Bowen Li Aizhan Zhumbayeva Kyung Yeun Kim eun-Bin Hong Min-Ho Nam Hojeong Jeon Youngmee Jung Huanyu Cheng Il-joo Cho Ki Jun Yu School of Electrical and Electronic Engineering Yonsei University50 Yonsei-roSeodaemunguSeoul 03722Republic of Korea Department of Biomedical Sciences College of MedicineKorea UniversitySeoul 02841Republic of Korea Brain Science Institute Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea School of Electrical Engineering Korea UniversitySeoul 02841Republic of Korea Department of Engineering Science and Mechanics The Pennsylvania State UniversityUniversity ParkPA 16802USA Center for Biomaterials Biomedical Research InstituteKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Biomaterials Research Center Biomedical Research DivisionKorea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea Department of Mechanical Engineering Seoul National UniversitySeoul 08826Republic of Korea Department of Biotechnology College of Life Science and BiotechnologyYonsei UniversitySeoul 03722Republic of Korea Department of KHU-KIST Convergence Science and Technology Kyung Hee UniversitySeoul 02447Republic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoul 02841Republic of Korea School of Electrical and Electronic Engineering YU-KIST InstituteYonsei UniversitySeoul 03722Republic of Korea Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA 16802USA Materials Research Institute The Pennsylvania State UniversityUniversity ParkPA 16802USA Department of Anatomy College of MedicineKorea UniversitySeoul 02841Republic of Korea Department of Electrical and Electronic Engineering YU-Korea Institute of Science and Technology(KIST)InstituteYonsei University50Yonsei-roSeodaemun-guSeoul 03722Korea

Challenges in the understanding of three-dimensional(3D)brain networks by simultaneously recording both surface and intracortical areas of brain signals remain due to the difficulties of constructing mechanical design and spatial limitations of the implanted ***,we present a foldable and flexible 3D neural prosthetic that facilitates the 3D mapping of complex neural circuits with high spatiotemporal dynamics from the intracortical to cortical *** device is the tool to map the 3D neural transmission through sophisticatedly designed four flexible penetrating shanks and surface electrode arrays in one integrated *** demonstrate the potential possibilities of identifying correlations of neural activities from the intracortical area to cortical regions through continuous monitoring of electrophysiological *** also exploited the structural properties of the device to record synchronized signals of single spikes evoked by unidirectional total whisker *** platform offers opportunities to clarify unpredictable 3D neural pathways and provides a next-generation neural interface.

关键词： neural electrode simultaneous

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Lubrication properties of silver-palladium alloy prepared by ion plating method for high temperature stud bolt

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Transactions of Nonferrous Metals Society of China 2011年第A1期21卷 12-16页

作者： Jung-Dae KWON Sunghun LEE Koo-Hyun LEE jong-joo RHA Kee-Seok NAN Se-Hun KWON Materials Processing Division Korea Institute of Materials Science Changwon Gyeongnam 641-831 Korea National Core Research Center for Hybrid Materials Solution Pusan National University

As a solid lubricant, silver-palladium (Ag-Pd) alloy coating was investigated for the application to high temperature stud bolt. A glue layer nickel (Ni) film was deposited on the surface of the hex bolt sample and then Ag-Pd alloy coating was performed on it using ion plating method. The friction coefficient of Ag-Pd alloy film coated bolt was lower than that of N-5000 oil coated bolt by the result of axial force measurement. The cyclic test of heat treatment was conducted to evaluate the durability of Ag-Pd alloy film coated bolt. In a cycle, sample was assembled into the block using torque wrench, followed by heating and disassembling. It was not successful to disassemble the N-5000 oil coated bolt from the block after only one cycle. However, the Ag-Pd alloy film coated bolt was able to be disassembled softly till 12 cycles.

关键词：银钯合金高温螺栓离子镀润滑性能薄膜涂层固体润滑剂合金镀层六角螺栓

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What is the real practice of exercise echocardiographic testing in asymptomatic patients with severe aortic stenosis？

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Chinese Medical Journal 2013年第24期126卷 4649-4654页

作者： eun Jeong Cho Sung-Ji Park Jung-eun Song Seol-Hwa Kim Yung-joo Lee Ji-Hye Gakt Sung-A Chang Sang-Chol Lee Seung Woo Park Division of Cardiology Department of Internal MedicineCardiovascular Imaging Center Cardiac and Vascular CenterSamsung Medical Center Sungkyunkwan University School ofMedicine Seoul Republic of Korea

Background Although exercise testing has been suggested to help predict clinical outcome, limited data are available to guide how exercise Doppler echocardiography （ECG） can be used clinically in asymptomatic patients with aortic stenosis （AS）. The aim of this study was to assess the clinical value of exercise echocardiographic testing in asymptomatic patients with severe AS. Methods Symptom-limited treadmill exercise testing using the modified Bruce protocol was performed in 31 asymptomatic patients （mean age （62＋11） years） with severe AS （aortic valve area 〈1 cm2, peak aortic velocity （AV Vmax）〉4 m/sec, or a mean transaortic pressure gradient （AV mean PG）〉40 mmHg （1 mmHg=0.133 kPa）） with normal left ventricular （LV） systolic function （LV ejection fraction （EF）〉50%）. Clinical symptoms, vital signs, ECG, and Doppler hemodynamics were obtained during and/or immediately after exercise. Results Aortic valve replacement （AVR） was performed in 18 patients during follow-up. The patients who had AVR exhibited higher baseline AV mean PG （51 （35-84） vs. 44 （25.2-57.0） mmHg; P=0.031）. There were no significant differences between the AVR group and non-AVR group including exercise duration （7.47 （2.32-11.59） vs. 7.25 （4.06- 10.52） minutes, P=0.917）, exercise capacity （10.1 （4.6-12.8） vs. 10.1 （7.0-12.8） metabolic equivalents, P=0.675）, and an increment in AV mean PG by exercise （18.5 （3.2-48.0） vs. 12.6 （4.4-32.1） mmHg, P=0.366）. Univariate regression analysis revealed that independent determinant of AVR was the baseline AV mean PG （P=-0.031）. Conclusions Although additional value of exercise ECG was demonstrated, baseline transaortic mean pressure gradient is the major determinant of AVR. Further large-scale prospective studies are required to determine whether surgery should be recommended in the presence of an abnormal exercise ECG in asymptomatic severe AS.

关键词： aortic stenosis exercise echocardiography asymptomatic, aortic valve replacement

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Superficial foveal avascular zone area changes before and after idiopathic epiretinal membrane surgery

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International Journal of Ophthalmology(English edition) 2018年第10期11卷 1711-1715页

作者： Yo Sep Yoon Je Moon Woo jong eun Woo Jung Kee Min Department of Ophthalmology Ulsan University Hospital College of Medicine University of Ulsan

To investigate the foveal morphological changes and foveal avascular zone（FAZ）area before and after epiretinal membrane（ERM）***-two eyes with treatmentnaive ERM were included in this retrospective *** central foveal thickness（CFT）and FAZ area were measured via swept-source optical coherence tomography（SS-OCT）and OCT angiography pre-and *** unaffected fellow eyes were used as *** preoperative superficial FAZ area was significantly smaller in patients（0.08±0.04 mm^2）than in controls（0.33±0.09 mm^2;P〈0.001）.The postoperative superficial FAZ（0.12±0.06 mm^2）area was significantly greater than the preoperative area（P〈0.001）.The preoperative superficial FAZ area was strongly negatively correlated with CFT（P〈0.001,rho=-0.763）.ERM induced significant foveal morphological changes and reduction of the superficial FAZ *** thickness was restored and FAZ area increased ***,the process is rather slow and the recovery is incomplete.

关键词： central foveal thickness epiretinal membrane foveal avascular zone optical coherence tomography angiography

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Graphene-GaN Schottky diodes

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Nano Research 2015年第4期8卷 1327-1338页

作者： Seongjun Kim Tae Hoon Seo Myung jong Kim Keun Man song eun-Kyung Suh Hyunsoo Kim School of Semiconductor and Chemical Engineering Semiconductor Physics Research Center Chonbuk National University Jeonju 561-756 Republic of Korea Soft Innovative Materials Research Center Korea Institute of Science and Technology Jeonbuk 561-905 Republic of Korea Korea Advanced Nano Fab Center Suwon 443-700 Republic of Korea

在 undoped 上形成的 graphene Schottky 接触的电的特征轧了半导体被调查。有 10 的校正比率的优秀修正行为在業慮楴湯漠 ? 敭慴汬捩瀠瑡獨愠牣獯 ? 桴 ? 潳牵散搯慲湩攠敬瑣潲敤 ? 祢映牯業杮琠敨渠湡浯獥 ? 瑳畲瑣牵 ? 湩琠敨栠杩... 详细信息

在 undoped 上形成的 graphene Schottky 接触的电的特征轧了半导体被调查。有 10 的校正比率的优秀修正行为在業慮楴湯漠 ? 敭慴汬捩瀠瑡獨愠牣獯 ? 桴 ? 潳牵散搯慲湩攠敬瑣潲敤 ? 祢映牯業杮琠敨渠湡浯獥 ? 瑳畲瑣牵 ? 湩琠敨栠杩 ? 敤獮瑩 ?坓呎渠瑥潷歲挠慨湮汥的 7 ？？

关键词：肖特基二极管 GaN 石墨氮化镓半导体势垒高度表面状态整流特性肖特基整流器

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8-Hydroxydeoxyguanosine:Not mere biomarker for oxidative stress,but remedy for oxidative stress-implicated gastrointestinal diseases

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World Journal of Gastroenterology 2012年第4期18卷 302-308页

作者： Chan-Young Ock eun-Hee Kim Duck joo Choi Ho Jae Lee Ki-Baik Hahm Myung Hee Chung Lab of Translational Medicine Gachon University of Medicine and ScienceLee Gil Ya Cancer and Diabetes Institute Department of Gastroenterology Gachon Graduate School of MedicineGil Hospital Sungkyunkwan University Samsung Advanced Institute for Biomedical Research

Reactive oxygen species (ROS) attack guanine bases in DNA easily and form 8-hydroxydeoxyguanosine (8-OHdG),which can bind to thymidine rather than cytosine,based on which,the level of 8-OHdG is gen-erally regarded as a biomarker of mutagenesis conse-quent to oxidative *** example,higher levels of 8-OHdG are noted in Helicobacter pylori-associated chronic atrophic gastritis as well as gastric ***,we have found that exogenous 8-OHdG can paradoxically reduce ROS production,attenuate thenuclear factor-κB signaling pathway,and ameliorate the expression of proinflammatory mediators such as interleukin (IL)-1,IL-6,cyclo-oxygenase-2,and induc-ible nitric oxide synthase in addition to expression of nicotinamide adenine dinucleotide phosphate oxidase (NOX)-1,NOX organizer-1 and NOX activator-1 in vari-ous conditions of inflammation-based gastrointestinal (GI) diseases including gastritis,inflammatory bowel disease,pancreatitis,and even colitis-associated *** recent finding that exogenous 8-OHdG was very effective in either inflammation-based or oxidative-stress-associated diseases of stress-related mucosal damage has inspired the hope that synthetic 8-OHdG can be a potential candidate for the treatment of inflammation-based GI diseases,as well as the pre-vention of inflammation-associated GI *** this editorial review,the novel fact that exogenous 8-OHdG can be a functional molecule regulating oxidative-stress-induced gastritis through either antagonizing Rac-guanosine triphosphate binding or blocking the signals responsible for gastric inflammatory cascade is introduced.

关键词：胃肠道疾病氧化应激生物标志物补救办法羟基烟酰胺腺嘌呤二核苷酸信号转导通路炎症介质

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