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Lee DW, Lee HS, Kim SG, Kim KJ, Jung SJ. The rocky road to freedom: number of countries transited during defection and risk of metabolic syndrome among North Korean Refugees in South Korea. Public Health 2023; 221:208-215. [PMID: 37490839 DOI: 10.1016/j.puhe.2023.06.019] [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: 11/24/2022] [Revised: 05/22/2023] [Accepted: 06/15/2023] [Indexed: 07/27/2023]
Abstract
OBJECTIVES North Korean Refugees (NKRs) undergo defection, and this has been shown to impact their current health status in South Korea. However, little is understood about how the defection process is related to metabolic syndrome (MetS). This study regarded the defection process to be a quasi-measurement of traumatic experience and investigated whether defection was a risk factor for MetS among NKRs living in South Korea. STUDY DESIGN This cross-sectional study obtained data from the Korea University Anam Hospital in Seoul. NKRs (N = 847) voluntarily completed questionnaires and underwent at least one medical examination between October 2008 and July 2021. METHODS Multivariable logistic regression models were used to evaluate whether the number of countries transited by NKRs was associated with MetS by controlling for covariates. RESULTS The prevalence of MetS among male and female NKRs in South Korea was 12.3% and 13.3%, respectively. The highest prevalence of MetS (33.4%) was among NKRs who had transited two countries. The number of months in transit countries (mean: 49.9 ± 51.7) and period of residence in South Korea (mean: 40.9 ± 40.9 months) were also considered. NKRs who transited three countries had a higher probability of MetS (odds ratio [OR] 2.660, 95% confidence interval [CI] 1.161-6.097) than those who travelled directly to South Korea. NKRs who transited three countries and had only resided in South Korea for a short period had a higher probability of MetS (OR 3.424, 95% CI 1.149-10.208) than those who have lived in South Korea for a longer period. CONCLUSIONS Considering the social vulnerability of NKRs and consequential health problems, there is an urgent need for appropriate support from the government and society.
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Affiliation(s)
- D W Lee
- Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea; Institute of Health Services Research, Yonsei University, Seoul, 03722, Republic of Korea
| | - H S Lee
- Research Investment for Global Health Technology Fund Foundation, Seoul, 03145, Republic of Korea
| | - S G Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University College of Medicine, Seoul, 02841, Republic of Korea; Department of Healthcare and Medicine for Unified Korea, Korea University College of Medicine, Seoul, 02842, Republic of Korea
| | - K J Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University College of Medicine, Seoul, 02841, Republic of Korea.
| | - S J Jung
- Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea; Department of Public Health, Graduate School, Yonsei University, Seoul, 03722, Republic of Korea; Center for Global Health, Massachusetts General Hospital, Boston, MA, 02114, USA; Harvard Center for Population and Developmental Studies, Cambridge, MA, 02138, USA.
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2
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Kim KJ, Hong N, Lee S, Shin S, Rhee Y. Exploratory use of romosozumab for osteoporosis in a patient with Hajdu-Cheney syndrome: a case report. Osteoporos Int 2023; 34:1005-1009. [PMID: 36622389 DOI: 10.1007/s00198-023-06668-z] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 12/30/2022] [Indexed: 01/10/2023]
Abstract
Hajdu-Cheney syndrome (HCS) is an inherited skeletal disorder caused by mutations in the Notch homolog protein 2 gene (NOTCH2). Treatment of this rare disease is challenging because there are no established guidelines worldwide. Previous case reports using bisphosphonates, denosumab, or teriparatide suggested that curative treatment for HCS did not exist yet in terms of preventing the disease progression. Therefore, the efficacy of romosozumab for osteoporosis in patients with HCS needs to be evaluated. Herein, we report the case of a 43-year-old woman who had progressive acro-osteolysis and repeated fractures since the age of 29 years. Next-generation sequencing confirmed HCS with a mutation at nucleotide 6758G>A, leading to Trp2253Ter replacement in NOTCH2. Romosozumab treatment was initiated because she had already received bisphosphonate for more than 10 years at other hospitals. After 1 year of romosozumab treatment, the bone mineral density (BMD) increased by 10.2%, 6.3%, and 1.3%, with Z scores of -2.9, -1.6, and -1.2 at the lumbar spine, femoral neck, and total hip, respectively. In addition, C-telopeptide was suppressed by 26.4% (0.121 to 0.089 ng/mL), and procollagen type I N-terminal propeptide increased by 18.7% (25.2 to 29.9 ng/mL). This was the first report of romosozumab treatment in patient with osteoporosis and HCS in Korea. One year of romosozumab treatment provided substantial gains in BMD with maintaining the last acro-osteolytic status without deteriorating, representing a possible treatment option for HCS.
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Affiliation(s)
- K J Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - N Hong
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - S Lee
- Department of Internal Medicine, Yonsei University Wonju College of Medicine, 20, Ilsan-ro, Wonju-si, Gangwon-do, 26426, Republic of Korea
| | - S Shin
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Y Rhee
- Department of Internal Medicine, Severance Hospital, Endocrine Research Institute, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
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3
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Lee J, Nakamura T, Kobayashi K, Kim DT, Ha T, Hahn GR, Kim KJ, Shin S. Transverse bunch-by-bunch feedback system for time-resolved experiments at PLS-II. J Synchrotron Radiat 2021; 28:1417-1422. [PMID: 34475289 DOI: 10.1107/s1600577521005889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 06/07/2021] [Indexed: 06/13/2023]
Abstract
A description of the upgraded bunch-by-bunch feedback system for time-resolved experiments at Pohang Light Source II (PLS-II) is provided. The bunch-by-bunch feedback system has been upgraded to increase the single-bunch current in the hybrid fill pattern of the PLS-II facility. The project is part of the SPring-8 and PLS-II collaboration. The main features of the upgrade are to employ a single 500 MHz analog-to-digital converter (ADC) instead of the previous four 125 MHz interleaved ADCs for 500 MHz rate, to replace a single-loop two-dimensional feedback with two independent one-dimensional feedback loops, to implement the tune measurement function with a single bunch, and mainly to implement single-bunch and stretcher control. The realization of a 400 mA hybrid fill pattern including a 10 mA single bunch demonstrates the precision of the upgraded bunch-by-bunch feedback system.
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Affiliation(s)
- Jaeyu Lee
- Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea
| | - T Nakamura
- SPring-8, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - K Kobayashi
- SPring-8, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - D T Kim
- Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea
| | - T Ha
- Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea
| | - G R Hahn
- Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea
| | - K J Kim
- Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea
| | - S Shin
- Pohang Accelerator Laboratory, POSTECH, Pohang, Kyungbuk 37673, Republic of Korea
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Kim KJ, Kim IS, Oh SH, Lee SM, Lee HJ, Kang SH, Lee JB, Ryu YL, Chang CL. Evaluation of an automated specimen processing system for staining and culture for acid-fast bacilli. Int J Tuberc Lung Dis 2021; 25:677-679. [PMID: 34330357 DOI: 10.5588/ijtld.21.0206] [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: 11/10/2022] Open
Affiliation(s)
- K J Kim
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - I-S Kim
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - S-H Oh
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - S M Lee
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - H-J Lee
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - S H Kang
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - J B Lee
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - Y L Ryu
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - C L Chang
- Department of Laboratory Medicine, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
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Abstract
BACKGROUND The concept of frailty has been suggested to comprise physical, mental, and social phenotypes. However, there is no general consensus about the appropriate components for assessing frailty. OBJECTIVES The purpose of this study was to reach consensus on components of frailty assessment using the Delphi process. METHODS To achieve consensus on the definition of frailty, a modified Delphi method was used. Geriatric and gerontologic experts were selected from various fields. The detailed components of frailty were composed of data from the Korean Frailty and Aging Cohort Study. Establishing consensus and collecting opinions from experts were conducted using a modified Delphi method. RESULTS Overall, nine domains with 14 components of frailty assessment were accepted. There was consensus on the necessity of a broad phenotype including physical, mental, and social frailty. CONCLUSIONS Consensus on the components of a frailty assessment in a clinical setting is achieved through the Delphi process to establish a new tool of frailty assessment.
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Affiliation(s)
- K J Kim
- Jaekyung Choi, MD, PhD, Department of Family Medicine, Konkuk University School of Medicine, Konkuk University Medical Center, 120-1 Neungdong-ro, Gwangjin-gu, Seoul 05030, Korea, ORCID: https://orcid.org/0000-0002-0875-7505, Tel: +82-2-2030-7683, Fax: +82-2030-5009, E-mail:
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6
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Kang DU, Park JC, Hwang SW, Park SH, Yang DH, Kim KJ, Ye BD, Myung SJ, Yang SK, Byeon JS. Long-term clinical outcomes of endoscopic submucosal dissection for colorectal neoplasia with or without the hybrid technique. Colorectal Dis 2020; 22:2008-2017. [PMID: 32866340 DOI: 10.1111/codi.15339] [Citation(s) in RCA: 4] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 07/04/2020] [Accepted: 08/18/2020] [Indexed: 12/12/2022]
Abstract
AIM The main aim of this study was to compare the long-term outcome of a conventional colorectal endoscopic submucosal dissection (ESD) in which submucosal dissection was continued throughout until the completion of resection (ESD-T) to hybrid endoscopic submucosal dissection (ESD-H) in the colorectum. METHOD Medical records of 836 colorectal neoplasia patients treated by ESD-T or ESD-H were reviewed. ESD-H was defined as colorectal ESD with additional snaring in the final stage of the procedure. Primary outcomes were the overall and metastatic recurrence rates. Secondary outcomes were short-term outcomes such as the en bloc resection rate, procedure time and adverse events. RESULTS The overall recurrence rate was higher in the ESD-H than in the ESD-T group (5.7% vs 0.7%, P = 0.001). The metastatic recurrence rate showed no significant difference between these groups (1.4% vs 1.4%, P = 1.000). Multivariate analysis revealed that a failed en bloc resection (hazard ratio 24.097; 95% CI 5.446-106.237; P < 0.001) and larger tumour size (hazard ratio 1.042; 95% CI 1.014-1.070; P = 0.003) were independently associated with overall recurrence. The ESD-H group showed a lower en bloc resection rate (56.8% vs 96.5%, P < 0.001), shorter procedure time (45.6 vs 54.3 min, P < 0.001) and higher perforation rate (10.3% vs 6.0%, P = 0.029). CONCLUSION Although long-term outcomes in terms of overall recurrence are inferior following ESD-H, a failed en bloc resection and large tumour size are the only independent risk factors for recurrence. Further investigations are warranted to improve the long-term outcomes of ESD-H.
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Affiliation(s)
- D U Kang
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - J C Park
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S W Hwang
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S H Park
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - D H Yang
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - K J Kim
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - B D Ye
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S J Myung
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - S K Yang
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - J S Byeon
- Department of Gastroenterology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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7
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Spring J, Sediva E, Hood ZD, Gonzalez-Rosillo JC, O'Leary W, Kim KJ, Carrillo AJ, Rupp JLM. Toward Controlling Filament Size and Location for Resistive Switches via Nanoparticle Exsolution at Oxide Interfaces. Small 2020; 16:e2003224. [PMID: 32939986 DOI: 10.1002/smll.202003224] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/22/2020] [Indexed: 06/11/2023]
Abstract
Memristive devices are among the most prominent candidates for future computer memory storage and neuromorphic computing. Though promising, the major hurdle for their industrial fabrication is their device-to-device and cycle-to-cycle variability. These occur due to the random nature of nanoionic conductive filaments, whose rupture and formation govern device operation. Changes in filament location, shape, and chemical composition cause cycle-to-cycle variability. This challenge is tackled by spatially confining conductive filaments with Ni nanoparticles. Ni nanoparticles are integrated on the bottom La0.2 Sr0.7 Ti0.9 Ni0.1 O3- δ electrode by an exsolution method, in which, at high temperatures under reducing conditions, Ni cations migrate to the perovskite surface, generating metallic nanoparticles. This fabrication method offers fine control over particle size and density and ensures strong particle anchorage in the bottom electrode, preventing movement and agglomeration. In devices based on amorphous SrTiO3 , it is demonstrated that as the exsolved Ni nanoparticle diameter increases up to ≈50 nm, the ratio between the ON and OFF resistance states increases from single units to 180 and the variability of the low resistance state reaches values below 5%. Exsolution is applied for the first time to engineer solid-solid interfaces extending its realm of application to electronic devices.
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Affiliation(s)
- Jonathan Spring
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
- Electrochemical Materials, Department of Materials, ETHZ, Hönggerbergring 64, Zurich, 8093, Switzerland
| | - Eva Sediva
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
- Electrochemical Materials, Department of Materials, ETHZ, Hönggerbergring 64, Zurich, 8093, Switzerland
| | - Zachary D Hood
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
| | - Juan Carlos Gonzalez-Rosillo
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
| | - Willis O'Leary
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
| | - Kun Joong Kim
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
| | - Alfonso J Carrillo
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
| | - Jennifer L M Rupp
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
- Electrochemical Materials, Department of Materials, ETHZ, Hönggerbergring 64, Zurich, 8093, Switzerland
- Electrochemical Materials, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Av., Cambridge, MA, 02139, USA
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8
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Gonzalez-Rosillo JC, Balaish M, Hood ZD, Nadkarni N, Fraggedakis D, Kim KJ, Mullin KM, Pfenninger R, Bazant MZ, Rupp JLM. Lithium-Battery Anode Gains Additional Functionality for Neuromorphic Computing through Metal-Insulator Phase Separation. Adv Mater 2020; 32:e1907465. [PMID: 31958189 DOI: 10.1002/adma.201907465] [Citation(s) in RCA: 8] [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] [Received: 11/13/2019] [Revised: 12/20/2019] [Indexed: 06/10/2023]
Abstract
Specialized hardware for neural networks requires materials with tunable symmetry, retention, and speed at low power consumption. The study proposes lithium titanates, originally developed as Li-ion battery anode materials, as promising candidates for memristive-based neuromorphic computing hardware. By using ex- and in operando spectroscopy to monitor the lithium filling and emptying of structural positions during electrochemical measurements, the study also investigates the controlled formation of a metallic phase (Li7 Ti5 O12 ) percolating through an insulating medium (Li4 Ti5 O12 ) with no volume changes under voltage bias, thereby controlling the spatially averaged conductivity of the film device. A theoretical model to explain the observed hysteretic switching behavior based on electrochemical nonequilibrium thermodynamics is presented, in which the metal-insulator transition results from electrically driven phase separation of Li4 Ti5 O12 and Li7 Ti5 O12 . Ability of highly lithiated phase of Li7 Ti5 O12 for Deep Neural Network applications is reported, given the large retentions and symmetry, and opportunity for the low lithiated phase of Li4 Ti5 O12 toward Spiking Neural Network applications, due to the shorter retention and large resistance changes. The findings pave the way for lithium oxides to enable thin-film memristive devices with adjustable symmetry and retention.
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Affiliation(s)
- Juan Carlos Gonzalez-Rosillo
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Moran Balaish
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Zachary D Hood
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Neel Nadkarni
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Dimitrios Fraggedakis
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Kun Joong Kim
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Kaitlyn M Mullin
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Reto Pfenninger
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
- Electrochemical Materials, Swiss Federal Institute of Technology, 8093, Zurich, Switzerland
| | - Martin Z Bazant
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
- Department of Mathematics, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
| | - Jennifer L M Rupp
- Electrochemical Materials, Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
- Electrochemical Materials, Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Av., 02139, Cambridge, MA, USA
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Kim KJ, Han H, Defferriere T, Yoon D, Na S, Kim SJ, Dayaghi AM, Son J, Oh TS, Jang HM, Choi GM. Facet-Dependent in Situ Growth of Nanoparticles in Epitaxial Thin Films: The Role of Interfacial Energy. J Am Chem Soc 2019; 141:7509-7517. [DOI: 10.1021/jacs.9b02283] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kun Joong Kim
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Hyeon Han
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Thomas Defferriere
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Daseob Yoon
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Suenhyoeng Na
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Sun Jae Kim
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Amir Masoud Dayaghi
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Junwoo Son
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Tae-Sik Oh
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, United States
| | - Hyun Myung Jang
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
| | - Gyeong Man Choi
- Department of Materials Science & Engineering/Fuel Cell Research Center, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
- 1FCell Inc., Pohang 37673, Republic of Korea
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10
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Han H, Park J, Nam SY, Kim KJ, Choi GM, Parkin SSP, Jang HM, Irvine JTS. Lattice strain-enhanced exsolution of nanoparticles in thin films. Nat Commun 2019; 10:1471. [PMID: 30931928 PMCID: PMC6443801 DOI: 10.1038/s41467-019-09395-4] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 03/08/2019] [Indexed: 11/30/2022] Open
Abstract
Nanoparticles formed on oxide surfaces are of key importance in many fields such as catalysis and renewable energy. Here, we control B-site exsolution via lattice strain to achieve a high degree of exsolution of nanoparticles in perovskite thin films: more than 1100 particles μm−2 with a particle size as small as ~5 nm can be achieved via strain control. Compressive-strained films show a larger number of exsolved particles as compared with tensile-strained films. Moreover, the strain-enhanced in situ growth of nanoparticles offers high thermal stability and coking resistance, a low reduction temperature (550 °C), rapid release of particles, and wide tunability. The mechanism of lattice strain-enhanced exsolution is illuminated by thermodynamic and kinetic aspects, emphasizing the unique role of the misfit-strain relaxation energy. This study provides critical insights not only into the design of new forms of nanostructures but also to applications ranging from catalysis, energy conversion/storage, nano-composites, nano-magnetism, to nano-optics. Dispersion of metallic nanoparticles is promising for energy conversion and storage, but gaining control of size and distribution is not trivial. Here the authors use lattice mismatch to manipulate exsolution of nanoparticles, achieving a high population of small nanoparticles in perovskite thin films.
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Affiliation(s)
- Hyeon Han
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.,Max Planck Institute of Microstructure Physics, Weinberg 2, Halle (Saale), 06120, Germany
| | - Jucheol Park
- Gyeongbuk Science & Technology Promotion Center, Gumi Electronics & Information Technology Research Institute, Gumi, 39171, Republic of Korea
| | - Sang Yeol Nam
- Gyeongbuk Science & Technology Promotion Center, Gumi Electronics & Information Technology Research Institute, Gumi, 39171, Republic of Korea.,Department of Materials Science and Engineering, Kumoh National Institute of Technology, Gumi, 39177, Republic of Korea
| | - Kun Joong Kim
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.,Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA
| | - Gyeong Man Choi
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.,1Fcell Inc., Pohang, 37673, Republic of Korea
| | - Stuart S P Parkin
- Max Planck Institute of Microstructure Physics, Weinberg 2, Halle (Saale), 06120, Germany.
| | - Hyun Myung Jang
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea. .,Research Institute of Advanced Materials, Seoul National University, Seoul, 08826, Republic of Korea.
| | - John T S Irvine
- School of Chemistry, University of St Andrews, St Andrews, KY16 9ST, Scotland, UK.
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11
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Shin J, Choi J, Kim KJ. Association between long-term exposure of ambient air pollutants and cardiometabolic diseases: A 2012 Korean Community Health Survey. Nutr Metab Cardiovasc Dis 2019; 29:144-151. [PMID: 30595346 DOI: 10.1016/j.numecd.2018.09.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 09/18/2018] [Accepted: 09/19/2018] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND AIM The associations of long-term exposure to particulate matter <10 μm in size (PM10), nitrogen dioxide (NO2), carbon monoxide (CO), sulfur dioxide (SO2), and ozone (O3) with cardiometabolic diseases (CMD) remain uncertain in the Korean population. Therefore, we sought to examine the associations between PM10, NO2, CO, SO2, and O3 and CMD using data collected from the Korean Community Health Survey. METHODS AND RESULTS We selected 100,867 adults aged 19 years or older who had lived in the same domicile for ≥10 years and surveyed them to collect data on socioeconomic characteristics; health-related behaviors; obesity; and physician-diagnosed CMD history, including hypertension, diabetes mellitus, dyslipidemia, stroke, myocardial infarction, and ischemic heart disease. We calculated interquartile ranges for PM10, NO2, CO, SO2, and O3 from the 10 year average concentrations (2003-2012). Hypertension, diabetes mellitus, and dyslipidemia were positively associated with PM10, NO2, CO, SO2, and O3 after adjusting for confounding factors. Obesity was positively associated with PM10, NO2, SO2, and O3. On the other hand, we found no associations between stroke, myocardial infarction, and ischemic heart disease and exposure to PM10, NO2, CO, SO2, and O3 in these subjects. In subjects aged ≥65 years, the risk of dyslipidemia was markedly increased under exposure to NO2 and CO compared to subjects aged <65 years. The risk of obesity was also significantly increased under exposure to PM10 and NO2. However, sex differences in these associations were not found. CONCLUSION Long-term exposure to PM10, NO2, CO, SO2, and O3 may be a risk factor of CMD in Korean adults.
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Affiliation(s)
- J Shin
- Department of Family Medicine, Konkuk University School of Medicine, Konkuk University Medical Centre, Seoul, South Korea.
| | - J Choi
- Department of Family Medicine, Konkuk University School of Medicine, Konkuk University Medical Centre, Seoul, South Korea
| | - K J Kim
- Department of Family Medicine, Konkuk University School of Medicine, Konkuk University Medical Centre, Seoul, South Korea
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Youn SW, Lee JH, Yu DY, Kim Y, Kim BS, Seo SJ, Choe YB, Yun SK, Park J, Kim NI, Choi CW, Youn JI, Lee SJ, Lee MG, Kim KJ, Park CJ, Ro YS, Song HJ, Shin BS, Ahn SK, Lee JY, Won YH, Jang MS, Kim KH, Kim MH, Kim TY, Choi JH. The relationship between clinical characteristics including presence of exposed lesions and health-related quality of life (HRQoL) in patients with psoriasis: analysis from the nationwide epidemiologic study for psoriasis in Korea (EPI-PSODE study). J Eur Acad Dermatol Venereol 2018; 32:1499-1506. [PMID: 29430733 DOI: 10.1111/jdv.14865] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 01/25/2018] [Indexed: 01/23/2023]
Abstract
BACKGROUND Psychological aspect and quality of life should be considered in treating patients with psoriasis. OBJECTIVE We sought to ascertain which clinical characteristics including presence of exposed lesions are associated with impairment of health-related quality of life (HRQoL) in patients with psoriasis. METHODS The EPI-PSODE study was a nationwide, multicenter, cross-sectional study conducted in Korea that included 1260 adult patients with psoriasis. In addition to clinical characteristics including presence of exposed lesions, data were collected using the Psoriatic Arthritis (PsA) Screening and Evaluation (PASE), Dermatology Life Quality Index (DLQI), MOS 36-Item Short-Form Health Survey (SF-36), Work Productivity and Activity Impairment Questionnaire Psoriasis (WPAI: PSO) and Medication Satisfaction Questionnaire (MSQ). RESULTS Patients with a DLQI score > 5 (n = 990) were younger, had an earlier onset of psoriasis, scored higher on the Psoriasis Area and Severity Index (PASI), had higher body surface area (BSA) and had higher PASE scores than patients with DLQI ≤ 5 (n = 266). The group of patients with exposed lesions (n = 871) were younger and male predominance, earlier onset of psoriasis, longer disease duration, higher PASI/BSA score and a higher proportion with drinking and smoking history each than the group of patients without exposed lesions (n = 389). Presence of exposed lesions negatively influenced DLQI, 36-Item Short-Form Health Survey (SF-36) (mental component), presenteeism, total work productivity impairment and total activity impairment in the WPAI: PSO. In multiple regression model, PASI score was the only variable which was significantly associated with all HRQoL measures. Presence of exposed lesions was a significant factor affecting DLQI and SF-36 (mental). CONCLUSION The presence of exposed lesions has a negative impact on quality of life, mental health and work productivity. Therefore, effective treatments are particularly needed for psoriasis patients with exposed lesions.
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Affiliation(s)
- S W Youn
- Department of Dermatology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - J-H Lee
- Department of Dermatology, Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea
| | - D Y Yu
- Medical Affairs, Janssen Korea, Seoul, Korea
| | - Y Kim
- Medical Affairs, Janssen Korea, Seoul, Korea
| | - B S Kim
- Department of Dermatology, Pusan National University School of Medicine, Busan, Korea
| | - S J Seo
- Department of Dermatology, Chung-Ang University Hospital, Seoul, Korea
| | - Y B Choe
- Department of Dermatology, Konkuk University School of Medicine, Seoul, Korea
| | - S-K Yun
- Department of Dermatology, Chonbuk National University Medical School, Jeonju, Korea
| | - J Park
- Department of Dermatology, Catholic University of Daegu School of Medicine, Daegu, Korea
| | - N I Kim
- Department of Dermatology, KyungHee University Medical center, Seoul, Korea
| | - C W Choi
- Department of Dermatology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - J I Youn
- Department of Dermatology, National Medical Center, Seoul, Korea
| | - S-J Lee
- Department of Dermatology, Kyungpook National University Hospital, Daegu, Korea
| | - M-G Lee
- Department of Dermatology, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - K J Kim
- Department of Dermatology, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - C J Park
- Department of Dermatology, The Catholic University of Korea, Bucheon St. Mary's Hospital, Bucheon, Korea
| | - Y S Ro
- Department of Dermatology, Hanyang University Medical Center, Seoul, Korea
| | - H J Song
- Department of Dermatology, Korea University Guro Hospital, Seoul, Korea
| | - B S Shin
- Department of Dermatology, Chosun University Hospital, Gwangju, Korea
| | - S K Ahn
- Department of Dermatology, Wonju Severance Christian Hospital, Wonju, Korea
| | - J Y Lee
- Department of Dermatology, Chungbuk National University College of Medicine, Cheongju, Korea
| | - Y H Won
- Department of Dermatology, Chonnam National University Hospital, Gwangju, Korea
| | - M S Jang
- Department of Dermatology, Kosin University College of Medicine, Busan, Korea
| | - K H Kim
- Department of Dermatology, Dong-A University Hospital, Busan, Korea
| | - M H Kim
- Department of Dermatology, Dankook University Hospital, Cheonan, Korea
| | - T Y Kim
- Department of Dermatology, Catholic University of Korea Seoul St. Mary's Hospital, Seoul, Korea
| | - J-H Choi
- Department of Dermatology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
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Jeong YJ, Oh TI, Woo EJ, Kim KJ. Integration of piezo-capacitive and piezo-electric nanoweb based pressure sensors for imaging of static and dynamic pressure distribution. Annu Int Conf IEEE Eng Med Biol Soc 2017; 2017:21-24. [PMID: 29059801 DOI: 10.1109/embc.2017.8036753] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Recently, highly flexible and soft pressure distribution imaging sensor is in great demand for tactile sensing, gait analysis, ubiquitous life-care based on activity recognition, and therapeutics. In this study, we integrate the piezo-capacitive and piezo-electric nanowebs with the conductive fabric sheets for detecting static and dynamic pressure distributions on a large sensing area. Electrical impedance tomography (EIT) and electric source imaging are applied for reconstructing pressure distribution images from measured current-voltage data on the boundary of the hybrid fabric sensor. We evaluated the piezo-capacitive nanoweb sensor, piezo-electric nanoweb sensor, and hybrid fabric sensor. The results show the feasibility of static and dynamic pressure distribution imaging from the boundary measurements of the fabric sensors.
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Park YB, Ha CW, Kim JA, Han WJ, Rhim JH, Lee HJ, Kim KJ, Park YG, Chung JY. Single-stage cell-based cartilage repair in a rabbit model: cell tracking and in vivo chondrogenesis of human umbilical cord blood-derived mesenchymal stem cells and hyaluronic acid hydrogel composite. Osteoarthritis Cartilage 2017; 25:570-580. [PMID: 27789339 DOI: 10.1016/j.joca.2016.10.012] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Revised: 09/26/2016] [Accepted: 10/15/2016] [Indexed: 02/02/2023]
Abstract
OBJECTIVE Human umbilical cord blood-derived mesenchymal stem cells (hUCB-MSCs) have gained popularity as a promising cell source for regenerative medicine, but limited in vivo studies have reported cartilage repair. In addition, the roles of MSCs in cartilage repair are not well-understood. The purpose of this study was to investigate the feasibility of transplanting hUCB-MSCs and hyaluronic acid (HA) hydrogel composite to repair articular cartilage defects in a rabbit model and determine whether the transplanted cells persisted or disappeared from the defect site. DESIGN Osteochondral defects were created in the trochlear grooves of the knees. The hUCB-MSCs and HA composite was transplanted into the defect of experimental knees. Control knees were transplanted by HA or left untreated. Animals were sacrificed at 8 and 16 weeks post-transplantation and additionally at 2 and 4 weeks to evaluate the fate of transplanted cells. The repair tissues were evaluated by gross, histological and immunohistochemical analysis. RESULTS Transplanting hUCB-MSCs and HA composite resulted in overall superior cartilage repair tissue with better quality than HA alone or no treatment. Cellular architecture and collagen arrangement at 16 weeks were similar to those of surrounding normal articular cartilage tissue. Histological scores also revealed that cartilage repair in experimental knees was better than that in control knees. Immunohistochemical analysis with anti-human nuclear antibody confirmed that the transplanted MSCs disappeared gradually over time. CONCLUSION Transplanting hUCB-MSCs and HA composite promote cartilage repair and interactions between hUCB-MSCs and host cells initiated by paracrine action may play an important role in cartilage repair.
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Affiliation(s)
- Y B Park
- Department of Orthopedic Surgery, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, South Korea.
| | - C W Ha
- Department of Orthopedic Surgery, Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea; Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul, South Korea.
| | - J A Kim
- Department of Orthopedic Surgery, Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
| | - W J Han
- Department of Orthopedic Surgery, Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
| | - J H Rhim
- Department of Orthopedic Surgery, Stem Cell & Regenerative Medicine Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
| | - H J Lee
- Department of Orthopedic Surgery, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, South Korea.
| | - K J Kim
- Department of Orthopedic Surgery, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, South Korea.
| | - Y G Park
- Department of Orthopedic Surgery, Jeju National University Hospital, Jeju National University School of Medicine, Jeju, South Korea.
| | - J Y Chung
- Department of Orthopedic Surgery, Ajou University Hospital, Ajou University School of Medicine, Suwon, South Korea.
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Kim KJ, Xuan SH, Park SN. Licoricidin, an isoflavonoid isolated from Glycyrrhiza uralensis Fisher, prevents UVA-induced photoaging of human dermal fibroblasts. Int J Cosmet Sci 2016; 39:133-140. [PMID: 27502959 DOI: 10.1111/ics.12357] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [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: 06/20/2016] [Accepted: 08/02/2016] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Licoricidin is an isoflavonoid isolated from Glycyrrhiza uralensis Fisher. In this study, we investigated the effects of licoricidin on photoaging of UVA-irradiated human dermal fibroblasts (HDFs). METHODS In vitro reactive oxygen species (ROS) scavenging activity, cellular protective effect and inhibition of elastase activity was determined by Fe3+ -EDTA/H2 O2 systems, photohaemolysis and elastase activity assay, respectively. Anti-oxidative capacity of the compound was evaluated by fluorescent ELISA and 2', 7'-dichlorofluorescin-diacetate (DCF-DA) assay. The expression of protein and phosphorylation was examined using Western blot. RESULTS The ROS scavenging activity (OSC50 ) of licoricidin was 2.77 μM. It was 3.1-fold higher than that of L-ascorbic acid. Its protective effects were confirmed in a study of 1 O2 -induced cellular damage to human erythrocytes. The τ50 value of 10 μM of licoricidin was 71.0 min; this was markedly higher than that obtained with α-tocopherol (37.0 min). The elastase inhibitory activity of licoricidin (IC50 of 61.2 μM) was 2.1-fold more potent than that of oleanolic acid. Licoricidin markedly reduced the UVA-induced intracellular ROS in a concentration-dependent manner. Western blot revealed that licoricidin attenuated the UVA-dependent induction of MMP-1 protein. Mechanistically, this appeared to be due to licoricidin-dependent inhibition of mitogen-activated protein kinases (MAPK) phosphorylation, which resulted in decreased c-Jun activation and reduced c-Jun and c-Fos expression. CONCLUSION Licoricidin blocks UVA-induced photoaging via ROS scavenging. This activity converges to limit the activity of MMP-1. These data suggest that licoricidin may be considered as an active ingredient in new topically applied anti-ageing formulations.
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Affiliation(s)
- K J Kim
- Department of Fine Chemistry, Cosmetic R&D Center, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Korea
| | - S H Xuan
- Department of Fine Chemistry, Cosmetic R&D Center, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Korea
| | - S N Park
- Department of Fine Chemistry, Cosmetic R&D Center, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul, 01811, Korea
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O'Rourke JG, Bogdanik L, Yáñez A, Lall D, Wolf AJ, Muhammad AKMG, Ho R, Carmona S, Vit JP, Zarrow J, Kim KJ, Bell S, Harms MB, Miller TM, Dangler CA, Underhill DM, Goodridge HS, Lutz CM, Baloh RH. C9orf72 is required for proper macrophage and microglial function in mice. Science 2016; 351:1324-9. [PMID: 26989253 DOI: 10.1126/science.aaf1064] [Citation(s) in RCA: 393] [Impact Index Per Article: 49.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Expansions of a hexanucleotide repeat (GGGGCC) in the noncoding region of the C9orf72 gene are the most common genetic cause of amyotrophic lateral sclerosis (ALS) and frontotemporal dementia. Decreased expression of C9orf72 is seen in expansion carriers, suggesting that loss of function may play a role in disease. We found that two independent mouse lines lacking the C9orf72 ortholog (3110043O21Rik) in all tissues developed normally and aged without motor neuron disease. Instead, C9orf72 null mice developed progressive splenomegaly and lymphadenopathy with accumulation of engorged macrophage-like cells. C9orf72 expression was highest in myeloid cells, and the loss of C9orf72 led to lysosomal accumulation and altered immune responses in macrophages and microglia, with age-related neuroinflammation similar to C9orf72 ALS but not sporadic ALS human patient tissue. Thus, C9orf72 is required for the normal function of myeloid cells, and altered microglial function may contribute to neurodegeneration in C9orf72 expansion carriers.
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Affiliation(s)
- J G O'Rourke
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - L Bogdanik
- The Jackson Laboratory, Bar Harbor, ME, USA
| | - A Yáñez
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - D Lall
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - A J Wolf
- Division of Biomedical Sciences, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - A K M G Muhammad
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - R Ho
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - S Carmona
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - J P Vit
- Division of Biomedical Sciences, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - J Zarrow
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - K J Kim
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - S Bell
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - M B Harms
- Department of Neurology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA
| | - T M Miller
- Department of Neurology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA
| | | | - D M Underhill
- Division of Biomedical Sciences, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - H S Goodridge
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
| | - C M Lutz
- The Jackson Laboratory, Bar Harbor, ME, USA
| | - R H Baloh
- Board of Governors Regenerative Medicine Institute, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA. Department of Neurology, Cedars-Sinai Medical Center, 8700 Beverly Boulevard, Los Angeles, CA 90048, USA
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Kim KJ, Kim HJ, Khalekuzzaman M, Yoo EH, Jung HH, Jang HS. Removal ratio of gaseous toluene and xylene transported from air to root zone via the stem by indoor plants. Environ Sci Pollut Res Int 2016; 23:6149-58. [PMID: 26797953 PMCID: PMC6763410 DOI: 10.1007/s11356-016-6065-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 11/24/2015] [Indexed: 05/04/2023]
Abstract
This work was designed to investigate the removal efficiency as well as the ratios of toluene and xylene transported from air to root zone via the stem and by direct diffusion from the air into the medium. Indoor plants (Schefflera actinophylla and Ficus benghalensis) were placed in a sealed test chamber. Shoot or root zone were sealed with a Teflon bag, and gaseous toluene and xylene were exposed. Removal efficiency of toluene and total xylene (m, p, o) was 13.3 and 7.0 μg·m(-3)·m(-2) leaf area over a 24-h period in S. actinophylla, and was 13.0 and 7.3 μg·m(-3)·m(-2) leaf area in F. benghalensis. Gaseous toluene and xylene in a chamber were absorbed through leaf and transported via the stem, and finally reached to root zone, and also transported by direct diffusion from the air into the medium. Toluene and xylene transported via the stem was decreased with time after exposure. Xylene transported via the stem was higher than that by direct diffusion from the air into the medium over a 24-h period. The ratios of toluene transported via the stem versus direct diffusion from the air into the medium were 46.3 and 53.7% in S. actinophylla, and 46.9 and 53.1% in F. benghalensis, for an average of 47 and 53% for both species. The ratios of m,p-xylene transported over 3 to 9 h via the stem versus direct diffusion from the air into the medium was 58.5 and 41.5% in S. actinophylla, and 60.7 and 39.3% in F. benghalensis, for an average of 60 and 40% for both species, whereas the ratios of o-xylene transported via the stem versus direct diffusion from the air into the medium were 61 and 39%. Both S. actinophylla and F. benghalensis removed toluene and xylene from the air. The ratios of toluene and xylene transported from air to root zone via the stem were 47 and 60 %, respectively. This result suggests that root zone is a significant contributor to gaseous toluene and xylene removal, and transported via the stem plays an important role in this process.
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Affiliation(s)
- K J Kim
- Urban Agriculture Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju, 560-852, Korea.
| | - H J Kim
- Urban Agriculture Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju, 560-852, Korea
| | - M Khalekuzzaman
- Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi, 6205, Bangladesh
| | - E H Yoo
- Urban Agriculture Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju, 560-852, Korea
| | - H H Jung
- Urban Agriculture Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju, 560-852, Korea
| | - H S Jang
- Urban Agriculture Research Division, National Institute of Horticultural and Herbal Science, Rural Development Administration, Wanju, 560-852, Korea
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Lee JS, Yoo Y, Lim BC, Kim KJ, Choi M, Chae JH. SATB2-associated syndrome presenting with Rett-like phenotypes. Clin Genet 2016; 89:728-32. [PMID: 26596517 DOI: 10.1111/cge.12698] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2015] [Revised: 11/18/2015] [Accepted: 11/19/2015] [Indexed: 11/30/2022]
Abstract
The SATB2-associated syndrome (SAS) was proposed recently, after the SATB2 gene was initially discovered to be associated with isolated cleft palate. This syndrome is characterized by intellectual disability with delayed speech development, facial dysmorphism, cleft or high-arched palate, and dentition problems. Here, we describe two novel SATB2 sequence variants in two unrelated patients presenting with Rett-like phenotypes. We performed trio-based whole-exome sequencing in a 17-month-old girl presenting with severe retardation and Rett-like phenotypes, which revealed a de novo missense variant in SATB2 (p.Glu396Gln). Moreover, targeted sequencing of the SATB2 gene was performed in a 2-year-old girl with severe psychomotor retardation, facial hypotonia, and cleft palate who also exhibited some features of Rett syndrome. A nonsense variant in SATB2 was identified in this patient (p.Arg459*). This study expanded the clinical and genetic spectrum of SAS. SATB2 variants should be considered in cases with psychomotor retardation alone or in any cases with Rett-like phenotypes, regardless of the typical features of SAS such as cleft palate.
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Affiliation(s)
- J S Lee
- Department of Pediatrics, Gachon University Gil Medical Center, Incheon, South Korea
| | - Y Yoo
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, South Korea
| | - B C Lim
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - K J Kim
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - M Choi
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, South Korea
| | - J-H Chae
- Department of Pediatrics, Pediatric Clinical Neuroscience Center, Seoul National University Children's Hospital, Seoul National University College of Medicine, Seoul, South Korea
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Choi Y, Lee KB, Kim KJ, Han J, Yi ES. Development of an optimized Compton suppression gamma-ray spectrometric system using Monte Carlo simulation. Appl Radiat Isot 2016; 109:558-562. [PMID: 26778448 DOI: 10.1016/j.apradiso.2015.12.058] [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: 12/23/2015] [Accepted: 12/28/2015] [Indexed: 11/19/2022]
Abstract
We have chosen to establish the Compton Suppression Spectrometer (CSS) for low activity environmental samples with a high purity germanium (HPGe) primary detector and a removable plug-in detector (NaI(Tl)) surrounded with a cylindrical annulus guard detector (NaI(Tl)). Monte Carlo simulation with PENELOPE (PENetration and Energy LOss of Positrons and Electrons) is used to determine the optimal geometry of the CSS. To verify a correlation between experiment and simulation, the energy distribution of (137)Cs and (60)Co point sources is measured and simulated for each condition. The CSS parameters are studied to determine optimal detector geometry and Compton Suppression Factor (CSF). The timing resolution of the CSS was found to be 44ns (FWHM), which is an outstanding result in the semiconductor-based gamma-ray spectrometry. All measured values of CSF agree within 5% with the values obtained from the simulation. The optimum geometry and CSF values are discussed.
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Affiliation(s)
- Y Choi
- University of Science and Technology, Daejeon, Republic of Korea; Korea Institute of Geoscience and Mineral Resources, Daejeon, Republic of Korea
| | - K B Lee
- Korea Research Institute of Standards and Science, Daejeon, Republic of Korea
| | - K J Kim
- Korea Institute of Geoscience and Mineral Resources, Daejeon, Republic of Korea.
| | - J Han
- Korea Research Institute of Standards and Science, Daejeon, Republic of Korea
| | - E S Yi
- Korea Institute of Geoscience and Mineral Resources, Daejeon, Republic of Korea
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Kim HJ, Seo JT, Kim KJ, Ahn H, Jeong JY, Kim JH, Song SH, Jung JH. Clinical significance of subclinical varicocelectomy in male infertility: systematic review and meta-analysis. Andrologia 2015; 48:654-61. [PMID: 26589369 DOI: 10.1111/and.12495] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/09/2015] [Indexed: 11/28/2022] Open
Abstract
Recent meta-analysis by the Cochrane collaboration concluded that treatment of varicocele may improve an infertile couple's chance of pregnancy. However, there has been no consensus on the management of subclinical varicocele. Therefore, we determine the impact of varicocele treatment on semen parameters and pregnancy rate in men with subclinical varicocele. The randomised controlled trials that assessed the presence and/or treatment of subclinical varicocele were included for systematic review and meta-analysis. Random effect model was used to calculate the weighted mean difference of semen parameters and odds ratio of pregnancy rates. Seven trials with 548 participants, 276 in subclinical varicocelectomy and 272 in no-treatment or clomiphene citrate subjects, were included. Although there was also no statistically significant difference in pregnancy rate (OR 1.29, 95% CI 0.99-1.67), surgical treatment resulted in statistically significant improvements on forward progressive sperm motility (MD 3.94, 95% CI 1.24-6.65). However, the evidence is not enough to allow final conclusions because the quality of included studies is very low and further research is needed.
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Affiliation(s)
- H J Kim
- Institute for Evidence-based Medicine, College of Medicine, Korea University, Seoul, Korea
| | - J T Seo
- Department of Urology, Cheil General Hospital, Dankook University College of Medicine, Seoul, Korea
| | - K J Kim
- Department of Urology, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - H Ahn
- Institute for Evidence-based Medicine, College of Medicine, Korea University, Seoul, Korea
| | - J Y Jeong
- Center for Health Promotion, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - J H Kim
- Department of Urology, Mizmedi Hospital, Seoul, Korea
| | - S H Song
- Department of Urology, CHA Gangnam Medical Center, CHA University, Seoul, Korea
| | - J H Jung
- Department of Urology, Yonsei University Wonju College of Medicine, Wonju, Korea
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Filosa JA, Morrison HW, Iddings JA, Du W, Kim KJ. Beyond neurovascular coupling, role of astrocytes in the regulation of vascular tone. Neuroscience 2015; 323:96-109. [PMID: 25843438 DOI: 10.1016/j.neuroscience.2015.03.064] [Citation(s) in RCA: 134] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2014] [Revised: 03/24/2015] [Accepted: 03/27/2015] [Indexed: 12/22/2022]
Abstract
The brain possesses two intricate mechanisms that fulfill its continuous metabolic needs: cerebral autoregulation, which ensures constant cerebral blood flow over a wide range of arterial pressures and functional hyperemia, which ensures rapid delivery of oxygen and glucose to active neurons. Over the past decade, a number of important studies have identified astrocytes as key intermediaries in neurovascular coupling (NVC), the mechanism by which active neurons signal blood vessels to change their diameter. Activity-dependent increases in astrocytic Ca(2+) activity are thought to contribute to the release of vasoactive substances that facilitate arteriole vasodilation. A number of vasoactive signals have been identified and their role on vessel caliber assessed both in vitro and in vivo. In this review, we discuss mechanisms implicating astrocytes in NVC-mediated vascular responses, limitations encountered as a result of the challenges in maintaining all the constituents of the neurovascular unit intact and deliberate current controversial findings disputing a main role for astrocytes in NVC. Finally, we briefly discuss the potential role of pericytes and microglia in NVC-mediated processes.
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Affiliation(s)
- J A Filosa
- Georgia Regents University, 1120 15th Street, Augusta, GA 30912, United States.
| | - H W Morrison
- University of Arizona, 1305 N. Martin Avenue, P.O. Box 210203, Tucson, AZ 85721, United States
| | - J A Iddings
- Georgia Regents University, 1120 15th Street, Augusta, GA 30912, United States
| | - W Du
- Georgia Regents University, 1120 15th Street, Augusta, GA 30912, United States
| | - K J Kim
- Georgia Regents University, 1120 15th Street, Augusta, GA 30912, United States
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Affiliation(s)
- M S Kim
- Department of Dermatology, College of Medicine, Hallym University, 896 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-070, Korea
| | - J Y Jung
- Department of Dermatology, College of Medicine, Hallym University, 896 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-070, Korea
| | - E B Cho
- Department of Dermatology, College of Medicine, Hallym University, 896 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-070, Korea
| | - E J Park
- Department of Dermatology, College of Medicine, Hallym University, 896 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-070, Korea.
| | - K H Kim
- Department of Dermatology, College of Medicine, Hallym University, 896 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-070, Korea
| | - K J Kim
- Department of Dermatology, College of Medicine, Hallym University, 896 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-070, Korea
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Kang BJ, Kim KJ, Kim TJ. Serodiagnosis of a viral haemorrhagic septicaemia virus infection. J Fish Dis 2015; 38:227-229. [PMID: 24697581 DOI: 10.1111/jfd.12233] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Revised: 01/04/2014] [Accepted: 01/07/2014] [Indexed: 06/03/2023]
Affiliation(s)
- B J Kang
- Ocean and Fisheries Research Institute, Jeju, Korea
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Ha JM, Yoon JH, Cho EB, Park GH, Park EJ, Kim KH, Kim KJ. Subungual desmoplastic malignant melanoma. J Eur Acad Dermatol Venereol 2014; 30:360-2. [PMID: 25307258 DOI: 10.1111/jdv.12777] [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: 11/28/2022]
Affiliation(s)
- J M Ha
- Department of Dermatology, Hallym University College of Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - J H Yoon
- Department of Dermatology, Hallym University College of Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - E B Cho
- Department of Dermatology, Hallym University College of Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - G H Park
- Department of Dermatology, Dongtan Sacred Heart Hospital, Hwasung, Korea
| | - E J Park
- Department of Dermatology, Hallym University College of Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - K H Kim
- Department of Dermatology, Hallym University College of Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
| | - K J Kim
- Department of Dermatology, Hallym University College of Medicine, Hallym University Sacred Heart Hospital, Anyang, Korea
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Amaresh S, Karthikeyan K, Kim KJ, An JY, Cho SJ, Chung KY, Cho BW, Nam KW, Lee YS. Metal oxide coated lithium cobalt fluorophosphate cathode materials for lithium secondary batteries--effect of aging and temperature. J Nanosci Nanotechnol 2014; 14:7545-7552. [PMID: 25942823 DOI: 10.1166/jnn.2014.9561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Lithium cobalt fluorophosphate (Li2CoPO4F) is a promising 5 V class cathode material for lithium secondary batteries. In this study, surface coating with ZrO2 improved the electrochemical activity of Li2CoPO4F with a maximum discharge capacity of 144 mA h g(-1). The effectiveness of ZrO2 coating was evaluated using aging analysis with a commercial electrolyte, i.e., 1 M LiPF6 in EC:DMC (1:1, v/v). The metal ion dissolution was reduced to 1/8th of that observed in the non-coated Li2CoPO4F. It was found that the thin coating layer had less or no contribution to the additional resistance for the cell, both at an open circuit potential and at a fully charged state; hence, the capacity of the cell was retained over cycling. Elevated temperature aging did not affect the intrinsic property of the coated Li2CoPO4F, as observed from the complete anodic and cathodic peaks from cyclic voltammetry studies after 30 days of storage at 50 degrees C. An increase in impedance was observed for aged cells, which could be due to the thick SEI layer formed during storage. The ZrO2 coating over Li2CoPO4F was crucial for the improved performance of electrode active material at higher operating potentials of up to 5.2 V.
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Ku SH, Cho EB, Park EJ, Kim KH, Kim KJ. Dermoscopic features of molluscum contagiosum based on white structures and their correlation with histopathological findings. Clin Exp Dermatol 2014; 40:208-10. [PMID: 25252138 DOI: 10.1111/ced.12444] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/03/2014] [Indexed: 11/30/2022]
Affiliation(s)
- S H Ku
- Department of Dermatology, College of Medicine, Hallym University Sacred Heart Hospital, 896 Pyeongchon-dong, Dongan-gu, Anyang, Gyeonggi-do, 431-070, Korea
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Amaresh S, Karthikeyan K, Kim KJ, Lee YG, Lee YS. Aluminum based sulfide solid lithium ionic conductors for all solid state batteries. Nanoscale 2014; 6:6661-6667. [PMID: 24816684 DOI: 10.1039/c4nr00804a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The present work focuses on the synthesis of lithium ionic conductors based on a Li2S-Al2S3-GeS-P2S5 system due to the high ionic conductivity exhibited by the constituents of this system. Mechanical milling for a short duration and a single step heat treatment at a moderate temperature of 550 °C resulted in crystalline powders with high lithium ionic conductivity at room temperature that are comparable to the organic liquid electrolytes. The effect of various aluminum to germanium ratios was studied. Among the samples containing Al : Ge, the ratio of 30 : 70 was found to show high ionic conductivities of 1.7 × 10(-3) S cm(-1) at 25 °C and ∼ 6 × 10(-3) S cm(-1) at 100 °C equivalent. The activation energy of this material was significantly less (Ea = 17 kJ mol(-1)), which can be considered to be the best value among solid electrolytes. The electrochemical stability was analyzed using cyclic voltammetry between -0.3 and 5.0 V and it was found that the voltammetric profile was smooth without any additional current response, due to electrolyte decomposition, or any other side reaction, except a pair of lithium deposition and stripping peaks.
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Affiliation(s)
- S Amaresh
- Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea.
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Huh JH, Song MK, Park KH, Kim KJ, Kim JE, Rhee YM, Lim SK. Gender-specific pleiotropic bone-muscle relationship in the elderly from a nationwide survey (KNHANES IV). Osteoporos Int 2014; 25:1053-61. [PMID: 24150214 DOI: 10.1007/s00198-013-2531-2] [Citation(s) in RCA: 18] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 09/25/2013] [Indexed: 12/16/2022]
Abstract
SUMMARY The aim of this study was to examine the gender-specific association between sarcopenia and bone geometry/metabolic parameters. Low muscle mass was associated with greater deterioration of bone than in deterioration of glucose or lipid profiles. This bone-muscle relationship was more prominent in men than in women. INTRODUCTION There are few studies that report on gender differences in the effects of low muscle mass on bone and metabolic parameters in elderly subjects. This study aimed to assess the gender-specific influence of muscle mass on bone and metabolic parameters. METHODS A total of 2,264 participants (940 men and 1,324 women) whose age ranged from 65 to 92 years were analyzed using data from The Fourth Korea National Health and Nutrition Examination Surveys (2008-2009). We measured bone mineral density (BMD) and appendicular muscle mass using the dual-energy X-ray absorptiometry and also measured metabolic profiles. RESULTS The age-related trend in bone and muscle coincided in men but not in women. Femoral neck (FN) and total hip (TH) BMD were highly correlated with muscle mass in both genders. However, in women, this correlation was not significant in the lumbar spine (LS). In addition, this positive correlation was stronger in the FN or TH than in the LS and was stronger in men than in women. Subjects with sarcopenia were at a higher risk for osteoporosis in the FN, TH, and LS in men, and in the TH and FN in women. The degree of association between muscle mass and metabolic profiles was relatively very weak. CONCLUSION Bone-muscle relationship was more prominent in men than in women. The gender differences in bone-muscle relationship may be helpful for the development of gender-specific preventive strategies in the elderly, especially in men.
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Affiliation(s)
- J H Huh
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-gu, Seoul, 120-752, South Korea
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Anitha D, Kim KJ, Lim SK, Lee T. Implications of local osteoporosis on the efficacy of anti-resorptive drug treatment: a 3-year follow-up finite element study in risedronate-treated women. Osteoporos Int 2013; 24:3043-51. [PMID: 23818209 DOI: 10.1007/s00198-013-2424-4] [Citation(s) in RCA: 10] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 05/21/2013] [Indexed: 11/26/2022]
Abstract
UNLABELLED The existence of local osteoporosis necessitates patient-specific analysis. Lower and higher ranges of local buckling ratio were found at femoral necks for adequate and inadequate drug response groups, respectively (grouped based on fracture loads). Management of hip fracture risk should be targeted at local geometric abnormalities causing instability. INTRODUCTION Hip fracture amongst the elderly is a growing concern especially with improvements in living standards and increasing lifespan. Approximately half of the total hip fractures result from those without osteoporosis. This escalates the need to observe local osteoporosis. By observing the local buckling ratio (BR) in the femoral neck in ten risedronate-treated subjects over 3 years, we discovered that subjects with improved fracture loads, as predicted by finite element (FE) analysis, were associated with lower local BR and vice versa. METHODS The 3D models of the left proximal femurs were generated, and local BR values at 30° intervals were obtained from femoral neck slices by measuring the respective mean cortical thickness and mean outer radius. Following geometric analysis, structural strength was examined with FE analysis where critical fracture loads (F cr) were acquired from sideways fall load simulations. RESULTS We classified subjects in three groups according to the change in F cr: adequate (+20 %), inadequate (-22 %) and indefinite (-2 %) drug response groups. A common striking feature was that lower and higher ranges of local BR values (baseline year) were found for adequate (min = 2.14, max = 8.04) and inadequate (min = 1.72, max = 11.38) drug response groups, respectively. CONCLUSIONS Subjects in the inadequate drug response group exhibited high local BR at the supero-anterior and supero-posterior regions. These high local BR values coincided with FE-predicted critical strain regions, whereas subjects from the adequate drug response group showed significantly reduced strain regions. The superiority of coupling geometry (BR) with structure (F cr) over bone mineral density measurements alone by monitoring local osteoporosis has been illustrated.
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Affiliation(s)
- D Anitha
- Department of Bioengineering, National University of Singapore, Block E1, #08-03, 9 Engineering Drive 1, Singapore, 117576, Singapore
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Akshintala VS, Hutfless SM, Colantuoni E, Kim KJ, Khashab MA, Li T, Elmunzer BJ, Puhan MA, Sinha A, Kamal A, Lennon AM, Okolo PI, Palakurthy MK, Kalloo AN, Singh VK. Systematic review with network meta-analysis: pharmacological prophylaxis against post-ERCP pancreatitis. Aliment Pharmacol Ther 2013; 38:1325-37. [PMID: 24138390 DOI: 10.1111/apt.12534] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [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: 07/07/2013] [Revised: 08/03/2013] [Accepted: 09/29/2013] [Indexed: 12/13/2022]
Abstract
BACKGROUND The efficacy of many pharmacological agents for preventing post-ERCP pancreatitis (PEP) has been evaluated in randomised controlled trials (RCTs), but it is unclear which agent(s) should be used in clinical practice. Network meta-analyses of RCTs are used to simultaneously compare several agents to determine their relative efficacy and identify priority agents for comparison in future RCTs. AIM To evaluate pharmacological agents for the prevention of PEP by conducting a network meta-analysis of RCTs. METHODS We searched MEDLINE, EMBASE and Cochrane Library databases for RCTs that evaluated the efficacy of agents for preventing PEP. RCTs were simultaneously analysed using random-effects network meta-analysis under the Bayesian framework to identify the best agents. The efficacy of agents was ordered according to the probability of being ranked as any of the top three best performing agents. RESULTS The network meta-analysis included 99 RCTs evaluating 16 agents in 25 313 patients. Topical epinephrine (adrenaline) was the most efficacious agent with 85.9% probability of ranking among the top three agents, followed by nafamostat (51.4%), antibiotics (44.5%) and NSAIDs (42.8%). However, in a sensitivity analysis including only rectal NSAIDs, NSAIDs moved from fourth rank to second (58.1%). Patients receiving topical epinephrine, compared with placebo, had a 75% reduced risk of PEP (OR 0.25, 95% probability interval 0.06-0.66). CONCLUSIONS Topical epinephrine and rectal NSAIDs are the most efficacious agents for preventing post-ERCP pancreatitis, based on existing RCTs. Combinations of these agents, which act on different steps in the pathogenesis of post-ERCP pancreatitis, should be evaluated in future trials.
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Affiliation(s)
- V S Akshintala
- Division of Gastroenterology, Johns Hopkins Medical Institutions, Baltimore, MD, USA
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Lee SG, Lee YH, Kim KJ, Lee W, Kwon OH, Kim JH. Additive association of vitamin D insufficiency and sarcopenia with low femoral bone mineral density in noninstitutionalized elderly population: the Korea National Health and Nutrition Examination Surveys 2009-2010. Osteoporos Int 2013; 24:2789-99. [PMID: 23652463 DOI: 10.1007/s00198-013-2378-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Accepted: 04/23/2013] [Indexed: 11/27/2022]
Abstract
UNLABELLED Vitamin D insufficiency and sarcopenia are crucial risk factors for osteoporosis. In a study of noninstitutionalized elderly subjects, we investigated the simultaneous effect of vitamin D and sarcopenia on bone mineral density (BMD) and found that sarcopenia was associated with low BMD in the femur, especially in those with suboptimal vitamin D levels. INTRODUCTION Although vitamin D insufficiency and sarcopenia are prevalent in the elderly population worldwide, their possible influence on BMD has not been determined. We aimed to investigate the different effect of vitamin D insufficiency and sarcopenia on BMD in the elderly Korean population. METHODS Individuals aged 60 or older were selected from those who participated in the Fourth and Fifth Korea National Health and Nutrition Examination Surveys conducted in 2009 and 2010; 1,596 males and 1,886 females were analyzed. Appendicular skeletal muscle mass (ASM) and BMD were assessed by dual-energy X-ray absorptiometry; serum 25-hydroxyvitamin D [25(OH)D] and a panel of clinical and laboratory parameters were also measured. RESULTS The study population was divided into four groups according to their vitamin D and sarcopenic status. BMD in total femur and in the femoral neck but not the lumbar spine was markedly decreased in sarcopenic subjects with vitamin D insufficiency [25(OH)D < 20 ng/ml] comparing to other groups, regardless of gender. Multivariable linear regression models showed that BMD was significantly associated with ASM and high daily calcium intake as well as conventional risk factors such as age, body mass index (BMI), and history of fracture. Independent predictors for low femur BMD included sarcopenia, low daily calcium intake, low 25(OH)D levels, age, and BMI. CONCLUSIONS These data showed that an association between vitamin D insufficiency and low BMD was more prominent in elderly subjects with sarcopenia.
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Affiliation(s)
- S-G Lee
- Department of Laboratory Medicine, Armed Forces Capital Hospital, Seongnam, South Korea
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Karthikeyan K, Amaresh S, Kim KJ, Kim SH, Chung KY, Cho BW, Lee YS. A high performance hybrid capacitor with Li2CoPO4F cathode and activated carbon anode. Nanoscale 2013; 5:5958-5964. [PMID: 23708774 DOI: 10.1039/c3nr00760j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
For the first time, we report the possibility of utilizing Li2CoPO4F as a novel cathode material for hybrid capacitor applications. Li2CoPO4F powders were prepared by a conventional two-step solid state method. A hybrid cell was fabricated using Li2CoPO4F as the cathode along with activated carbon (AC) as the anode in 1 M LiPF6 dissolved in 1 : 1 EC/DMC electrolyte and its electrochemical properties were examined by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and constant current charge-discharge (C-D) techniques. The Li2CoPO4F/AC cell is capable of delivering a discharge capacitance of 42 F g(-1) at 150 mA g(-1) current density within 0-3 V region having excellent coulombic efficiency of over 99% even after 1000 cycles. Furthermore, the Li2CoPO4F/AC cell exhibited excellent rate performance with an energy density of ~24 W h kg(-1) at 1100 mA g(-1) current and maintained about 92% of its initial value even after 30,000 C-D cycles. Electrochemical impedance spectroscopy was conducted to corroborate the results that were obtained and described.
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Affiliation(s)
- K Karthikeyan
- Faculty of Applied Chemical Engineering, Chonnam National University, Gwangju 500-757, Korea.
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Shin S, Kim KJ, Chang HJ, Lee BW, Yang WI, Cha BS, Choi D. The effect of oral prostaglandin analogue on painful diabetic neuropathy: a double-blind, randomized, controlled trial. Diabetes Obes Metab 2013; 15:185-8. [PMID: 22974254 DOI: 10.1111/dom.12010] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2011] [Revised: 10/11/2011] [Accepted: 07/02/2012] [Indexed: 12/29/2022]
Abstract
This study was performed to assess the efficacy of beraprost sodium (BPS) in painful diabetic peripheral neuropathy (DPN) in type 2 diabetes mellitus (T2DM) patients. In this randomized clinical trial, 99 T2DM patients (41% male, age 60 ± 6 years) with DPN but without evidence of peripheral artery disease were randomized to receive either BPS (40 µg, tid) or placebo for 8 weeks. The primary end point was the improvement of the total symptom score (TSS), temperature rebound (TR) and nadir to peak (NP) above baseline. After 8 weeks treatment, the change of TSS in the BPS group showed a significant improvement compared to the placebo group (2.80 ± 2.48 vs. 1.60 ± 1.94 points, p = 0.009). Furthermore, the number of patients who showed signs of improvement in TSS and the proportion of patients with 50% relief of symptom was also significantly greater in the BPS group than in the placebo group (83.7 vs. 62%, p = 0.015, 36.2 vs. 14%, p = 0.009, respectively). In conclusion, treatment with BPS significantly improved TSS over an 8-week period.
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Affiliation(s)
- S Shin
- Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Seoul, Korea
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Ye BD, Yang SK, Kim D, Shim TS, Kim SH, Kim MN, Lee YJ, Na HK, Park SH, Yang DH, Kim KJ, Byeon JS, Myung SJ, Kim JH. Diagnostic sensitivity of culture and drug resistance patterns in Korean patients with intestinal tuberculosis. Int J Tuberc Lung Dis 2012; 16:799-804. [PMID: 22508109 DOI: 10.5588/ijtld.11.0252] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
SETTING It is challenging to differentiate between intestinal tuberculosis (ITB) and Crohn's disease in areas where TB is still prevalent. The use of diagnostic tools and verifying the drug resistance patterns of ITB can be helpful for its correct diagnosis. OBJECTIVE To determine the diagnostic sensitivity of a culture assay using colonoscopic biopsy specimens and the drug resistance patterns of Mycobacterium tuberculosis isolated from ITB. DESIGN Data from 400 patients diagnosed with ITB were retrospectively analysed. RESULTS Of the 400 patients, 170 (42.5%) were males; the median age at diagnosis was 40 years. The sensitivity of culture was 44.1% (145/329). Resistance to at least one anti-tuberculosis drug was identified in 13 (17.6%) and multidrug-resistant TB (MDR-TB) was diagnosed in two (2.7%) of the 74 patients for whom drug susceptibility testing was performed. Including M. tuberculosis isolated from respiratory specimens, the proportion of MDR-TB was 4.4% (5/113); previous anti-tuberculosis treatment was an independent risk factor for MDR-TB (26.7% vs. 1.0%, P < 0.01). CONCLUSION Culture of colonoscopic biopsy specimens shows substantial diagnostic sensitivity; the frequency of MDR-TB is higher in previously treated cases than in new cases.
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Affiliation(s)
- B D Ye
- Department of Gastroenterology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
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Jang YS, Kim GB, Kim KJ, Kim MS, Lee HJ, Lee JS, Lee KB, Lee MK, Lee SJ, Ri HC, Yoon WS, Yuryev YN, Kim YH. Development of decay energy spectroscopy using low temperature detectors. Appl Radiat Isot 2012; 70:2255-9. [PMID: 22410296 DOI: 10.1016/j.apradiso.2012.02.109] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2011] [Accepted: 02/22/2012] [Indexed: 10/28/2022]
Abstract
We have developed a high-resolution detection technique for measuring the energy and activity of alpha decay events using low-temperature detectors. A small amount of source material containing alpha-emitting radionuclides was enclosed in a 4π metal absorber. The energy of the alpha particles as well as that of the recoiled nuclides, low-energy electrons, and low-energy x-rays and γ-rays was converted into thermal energy of the gold absorber. A metallic magnetic calorimeter serving as a fast and sensitive thermometer was thermally attached to the metal absorber. In the present report, experimental demonstrations of Q spectroscopy were made with a new meander-type magnetic calorimeter. The thermal connection between the temperature sensor and the absorber was established with annealed gold wires. Each alpha decay event in the absorber resulted in a temperature increase of the absorber and the temperature sensor. Using the spectrum measured for a drop of (226)Ra solution in a 4π gold absorber, all of the alpha emitters in the sample were identified with a demonstration of good detector linearity. The resolution of the (226)Ra spectrum showed a 3.3 keV FWHM at its Q value together with an expected gamma escape peak at the energy shifted by its γ-ray energy.
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Affiliation(s)
- Y S Jang
- Korea Research Institute of Standards and Science (KRISS), Daejeon, South Korea
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Abstract
AIM To investigate whether the change in glycated albumin 3 weeks after initiating anti-diabetes treatment (oral hypoglycaemic agent or insulin) could predict the corresponding change in HbA(1c) 3 months later in Korean patients with Type 2 diabetes. METHODS A total of 140 patients were enrolled into two groups: group I (insulin-based; n = 100) and group II (oral hypoglycaemic agent-based; n = 40). Both glycated albumin and HbA(1c) levels were measured as 'glucose control markers' during hospitalization. Glycated albumin was measured again at 3 weeks (first visit) after the initial measurement, and HbA(1c) was measured at 3 months (second visit) after the initial measurement.. The change in glucose control marker was defined as 100 × (follow-up glucose control marker--hospital glucose control marker)/hospital glucose control marker. RESULTS In both groups, the change in glycated albumin at the first visit and in HbA(1c) at the second visit showed a moderate linear relationship (r = 0.735; P < 0.01). In group II (r = 0.778; P < 0.01), a slightly stronger linear relationship was demonstrated than in group I (r = 0.738; P < 0.001); however, there was no statistically significant difference between the two groups. A correlation coefficient between the change in glycated albumin and HbA(1c) was not affected by sex, age, BMI, haemoglobin, serum creatinine or albumin. CONCLUSION The reduction in glycated albumin 3 weeks after the initiation of treatment corresponded with the reduction in HbA(1c) 3 months after starting treatment in both the group treated with a oral hypoglycaemic agent and the insulin-treated group of Korean patients with Type 2 diabetes.
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Affiliation(s)
- H K Won
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
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Park SH, Yang SK, Kim MJ, Yang DH, Jung KW, Kim KJ, Ye BD, Byeon JS, Myung SJ, Kim JH. Long term follow-up of appendiceal and distal right-sided colonic inflammation. Endoscopy 2012; 44:95-8. [PMID: 22198779 DOI: 10.1055/s-0031-1291443] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [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] [Indexed: 12/10/2022]
Abstract
The aim of this study was to investigate the possibility of appendiceal orifice inflammation (AOI) as a preceding lesion in the development of ulcerative colitis. A total of 20 patients were identified (mean age 41.2 years; 11 males) who had ulcerative colitis-like inflammatory lesions at the appendiceal orifice without concomitant typical features of ulcerative colitis, such as rectal involvement. A total of 19 patients were followed up endoscopically for a mean duration of 18.4 months (range 2 - 84 months). Typical ulcerative colitis developed in five patients (25 %; four proctitis, one pancolitis) in a mean time of 18.4 months (range 2 - 36 months). Negative conversion of all inflammatory lesions occurred in seven patients (35 %) after a mean follow-up of 20 months (range 3 - 84 months). In the remaining seven patients (35 %), initial lesions did not progress to ulcerative colitis and did not go into remission during a mean follow-up of 16.9 months (range 2 - 42 months). These results suggest that, at least in some cases, AOI precedes development of ulcerative colitis.
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Affiliation(s)
- S H Park
- Department of Gastroenterology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
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Lim BC, Ki CS, Cho A, Hwang H, Kim KJ, Hwang YS, Kim YE, Yun JY, Jeon BS, Lim YH, Paek SH, Chae JH. Pantothenate kinase-associated neurodegeneration in Korea: recurrent R440P mutation in PANK2 and outcome of deep brain stimulation. Eur J Neurol 2011; 19:556-61. [PMID: 22103354 DOI: 10.1111/j.1468-1331.2011.03589.x] [Citation(s) in RCA: 32] [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: 11/28/2022]
Abstract
BACKGROUND AND PURPOSE The purpose of this study was to evaluate the mutation status of PANK2 among Korean patients with pantothenate kinase-associated neurodegeneration (PKAN) and to document the outcome of pallidal deep brain stimulation (DBS). METHODS Direct sequencing and deletion/duplication analysis of PANK2 were conducted in 12 patients (11 unrelated) with PKAN, diagnosed on the basis of extrapyramidal dysfunction and the 'eye-of-the-tiger sign' on brain magnetic resonance imaging (MRI). Pallidal DBS was conducted in four patients, and the outcomes were measured using the Burke-Fahn-Marsden Dystonia Rating Scale (BFMDRS). RESULTS A PANK2 mutation was identified in both alleles in all patients. The most prevalent mutation was c.1319G>C (p.R440P) in 8/22 mutated alleles (36%). An intragenic deletion ranging from exons 2 to 4 was found in one allele (1/22, 4.5%) using deletion/duplication analysis. The outcome of pallidal DBS was favorable in two patients with atypical PKAN and moderate severity of dystonia. However, two patients with typical PKAN and relatively severe symptoms showed variable responses. CONCLUSIONS The c.1319G>C (p.R440P) mutation appears to be a founder genotype among Korean patients with PKAN. Furthermore, this study provides additional data for the recent international effort to evaluate the efficacy of pallidal DBS in the treatment of patients with PKAN.
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Affiliation(s)
- B C Lim
- Department of Pediatrics, Seoul National University College of Medicine, Seoul National University Children's Hospital, Seoul, Korea.
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Jang EY, Hwang M, Yoon SS, Lee JR, Kim KJ, Kim HC, Yang CH. Liquiritigenin decreases selective molecular and behavioral effects of cocaine in rodents. Curr Neuropharmacol 2011; 9:30-4. [PMID: 21886557 PMCID: PMC3137196 DOI: 10.2174/157015911795017371] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 04/17/2010] [Accepted: 05/26/2010] [Indexed: 11/30/2022] Open
Abstract
Cocaine, as an indirect dopamine agonist, induces selective behavioral and physiological events such as hyperlocomotion and dopamine release. These changes are considered as consequences of cocaine-induced molecular adaptation such as CREB and c-Fos. Recently, methanolic extracts from licorice was reported to decrease cocaine-induced dopamine release and c-Fos expression in the nucleus accumbens. In the present study, we investigated the effects of liquiritigenin (LQ), a main compound of licorice, on acute cocaine-induced behavioral and molecular changes in rats. LQ attenuated acute cocaine-induced hyperlocomotion in dose-dependent manner. In addition, LQ inhibited CREB phosphorylation and c-Fos expression in the striatum and the nucleus accumbens induced by acute cocaine. Results provide strong evidence that LQ effectively attenuates the acute behavioral effects of cocaine exposure and prevents the induction of selective neuroadaptive changes in dopaminergic signaling pathways. Further investigation of LQ from licorice extract might provide a novel therapeutic strategy for the treatment of cocaine addiction.
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Affiliation(s)
- E Y Jang
- Department of Physiology, College of Oriental Medicine, Daegu Haany University, Daegu 706-828, South Korea
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Cho JH, Kim MJ, Kim KJ, Kim JR. POZ/BTB and AT-hook-containing zinc finger protein 1 (PATZ1) inhibits endothelial cell senescence through a p53 dependent pathway. Cell Death Differ 2011; 19:703-12. [PMID: 22052190 DOI: 10.1038/cdd.2011.142] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Vascular cell senescence, induced by the DNA damage response or inflammatory stress, contributes to age-associated vascular disease. Using complementary DNA microarray technology, we found that the level of POZ/BTB and AT-hook-containing zinc finger protein 1 (PATZ1) is downregulated during endothelial cell (EC) senescence. PATZ1 may have an important role as a transcriptional repressor in chromatin remodeling and transcription regulation; however, the role of PATZ1 in EC senescence and vascular aging remains unidentified. Knockdown of PATZ1 in young cells accelerated premature EC senescence, which was confirmed by growth arrest, increased p53 protein level and senescence-associated β-galactosidase (SA-β-gal) activity, and repression of EC tube formation. In contrast, overexpression of PATZ1 in senescent cells reversed senescent phenotypes. Cellular senescence induced by PATZ1 knockdown in young cells was rescued by knockdown of p53, but not by knockdown of p16(INK4a). PATZ1 knockdown increased ROS levels, and pretreatment with N-acetylcysteine abolished EC senescence induced by PATZ1 knockdown. Notably, PATZ1 immunoreactivity was lower in ECs of atherosclerotic tissues than those of normal arteries in LDLR(-/-) mice, and immunoreactivity also decreased in ECs of old human arteries. These results suggest that PATZ1 may have an important role in the regulation of EC senescence through an ROS-mediated p53-dependent pathway and contribute to vascular diseases associated with aging.
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Affiliation(s)
- J H Cho
- Department of Biochemistry and Molecular Biology, Aging-associated Vascular Disease Research Center, College of Medicine, Yeungnam University, Daegu, Republic of Korea
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Kim KM, Brown JK, Kim KJ, Choi HS, Kim HN, Rhee Y, Lim SK. Differences in femoral neck geometry associated with age and ethnicity. Osteoporos Int 2011; 22:2165-74. [PMID: 20976592 DOI: 10.1007/s00198-010-1459-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2010] [Accepted: 08/31/2010] [Indexed: 11/27/2022]
Abstract
SUMMARY We studied femoral geometry in relation to age and ethnicity in a cross-sectional study. Age-associated cortical thinning showed the most pronounced effect, and Koreans studied here had thicker cortices and lower buckling ratios than those reported for other races. Cortical thickness may thus be a major determinant of hip fracture risk. INTRODUCTION The rate of hip fracture varies by age and ethnicity. The geometric properties of the femur influence femoral strength and fragility, but differences in femoral geometry according to age and ethnicity are poorly understood. To explain the high prevalence of hip fractures in the elderly and the relatively low hip fracture rate in Asian populations, we studied age-related changes and ethnic differences in femoral geometry. METHODS We recruited 214 peri- or postmenopausal women aged 46 to 85 years (mean age, 60.6 years). Their proximal femoral bone mineral densities (BMD) were measured by quantitative computed tomography and further analyzed geometric properties. RESULTS We observed large declines in trabecular volumetric bone mineral density associated with aging (33.03% less than the reference value in the oldest group, respectively). Cortical thickness decreased remarkably with age as well, and only 53.94% of the baseline value remained in the oldest group. As a result, the cortical buckling ratio increased geometrically and reached 239.14% of the reference value in the oldest group. In comparisons with other ethnic groups, Korean subjects had thicker cortices than their American, European, and African counterparts. CONCLUSIONS In this cross-sectional study, cortical thickness showed a pronounced age-associated decrease, and the cortical buckling ratio showed a strong age-associated increase. This may in part explain the higher rates of hip fractures in the elderly. When compared with other races, Asians had thicker cortical bone and lower buckling ratios, which may partially explain the lower prevalence of hip fractures in Asians.
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Affiliation(s)
- K M Kim
- Division of Endocrinology, Department of Internal Medicine, and Institute of Endocrine Research, Yonsei University College of Medicine, 250 Seongsan-ro, Seodaemun-gu, Seoul, 120-752, South Korea
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Kim SH, Choi HS, Rhee Y, Kim KJ, Lim SK. Prevalent vertebral fractures predict subsequent radiographic vertebral fractures in postmenopausal Korean women receiving antiresorptive agent. Osteoporos Int 2011; 22:781-7. [PMID: 20533028 DOI: 10.1007/s00198-010-1298-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2009] [Accepted: 03/30/2010] [Indexed: 10/19/2022]
Abstract
UNLABELLED The relationship between prevalent vertebral fractures and new vertebral fractures in Korean women has not been previously studied. We found that prevalent vertebral fracture is a strong risk factor for subsequent radiographic vertebral fracture, independent of age and spine bone mineral density (BMD) in postmenopausal Korean women receiving antiresorptive agents. INTRODUCTION The presence of prevalent vertebral fractures increases the risk of subsequent vertebral fractures. This observational study examined whether prevalent vertebral fractures influenced future incident vertebral fracture in postmenopausal women receiving antiresorptive treatment. METHODS Using the medical records, we retrospectively assessed 1,200 postmenopausal women who had visited the osteoporosis clinic. Among them, we selected patients whose BMD was measured at least once a year for 3 years. We excluded patients whose lateral spine X-ray film at baseline or follow-up period was missing, which is the key assessment. In the end, we analyzed 666 postmenopausal women. The mean duration of follow-up period was 3.2 years. RESULTS The majority of patients (83%) received bisphosphonates or raloxifene during the mean duration of 3.2 years. Fifty-five of the 666 women had new incident radiographic vertebral fractures during the follow-up period. Prevalent vertebral fractures were associated with a five-fold increased risk (odd ratio 5.7, 95% CI 3.09-10.74) of incident vertebral fractures after adjusting for age. These associations remained significant after the adjustment for multiple confounding factors (odd ratio 4.4, 95% CI 1.97-9.75). The risk of incident vertebral fracture increased with the number of prevalent vertebral fractures at baseline: 3.4 (95% CI 1.54-7.70) for those with a single fracture and 7.4 (95% CI 3.10-17.54) for those with two or more after adjustment for age and spine BMD. CONCLUSIONS We confirmed that prevalent vertebral fracture is a strong risk factor for new vertebral fractures, independent of age and spine BMD in postmenopausal Korean women receiving antiresorptive agents.
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Affiliation(s)
- S H Kim
- Division of Endocrinology, Department of Internal Medicine, Kwandong University College of Medicine, Myongji Hospital, Goyang, South Korea
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Abstract
Free-electron lasers as scientific instruments are reviewed. The present status and future prospects are delineated with attention drawn to the size, complexity, availability, and performance capability of this new tool.
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Hong JW, Nam W, Cha IH, Chung SW, Choi HS, Kim KM, Kim KJ, Rhee Y, Lim SK. Oral bisphosphonate-related osteonecrosis of the jaw: the first report in Asia. Osteoporos Int 2010; 21:847-53. [PMID: 19633881 DOI: 10.1007/s00198-009-1024-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2009] [Accepted: 07/06/2009] [Indexed: 10/20/2022]
Abstract
UNLABELLED Bisphosphonate-related osteonecrosis of the jaw (BRONJ) is a serious side effect of bisphosphonate therapy. The incidence of BRONJ is known to be low among patients treated with oral bisphosphonates. We investigated the prevalence, demographics, clinical manifestations, and treatment outcome of 24 patients with oral BRONJ in Asian populations. INTRODUCTION The long-term safety of oral bisphosphonates is clinically important considering the rare but potentially serious complications such as bisphosphonate-related osteonecrosis of the jaw (BRONJ) versus the effect of reducing and preventing osteoporotic fracture. The incidence of BRONJ is known to be low among patients treated with oral bisphosphonates around the world. However, the prevalence in those taking oral bisphosphonates for osteoporosis in Asian populations is unknown. Moreover, a recent article, showing that the majority of reported patients who received alendronate were Asian American, raised concern about the prevalence of oral BRONJ in Asian populations. The objective of this study was to investigate the estimated prevalence, clinical characteristics, and treatment outcome of oral BRONJ in Asian populations. METHODS From October 2005 to December 2008, a retrospective review of medical charts identified 24 patients receiving oral bisphosphonates diagnosed as BRONJ at the Department of Oral and Maxillofacial Surgery, Yonsei University Dental Hospital, Seoul, South Korea. RESULTS The estimated prevalence of oral BRONJ was 0.05-0.07%. The average oral bisphosphonate treatment duration was 43.1 months (range, 5-120 months). Treatment with oral antibiotics and/or surgery including sequestrectomy or alveolectomy showed relatively favorable results. CONCLUSIONS The prevalence of oral BRONJ in Korea is similar to that reported previously in Western populations. We suggest that recognition of BRONJ and appropriate management pre- and post-dental surgery might reduce the frequency of BRONJ among patients receiving oral bisphosphonates.
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Affiliation(s)
- J W Hong
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, South Korea
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Affiliation(s)
- K J Kim
- Division of Gastroenterology, Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea.
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Nguyen TH, Kim YU, Kim KJ, Choi SS. Investigation of structural transition of dsDNA on various substrates studied by atomic force microscopy. J Nanosci Nanotechnol 2009; 9:2162-2168. [PMID: 19435096 DOI: 10.1166/jnn.2009.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Structural transition of single dsDNA molecule which is immobilized on 3-aminopropyltriethoxysilane (APTES) treated substrate (APTES/substrate) or alkylthiol treated substrate (alkylthiol/substrate) has been investigated by atomic force microscopy (AFM). The obtained force versus distance (F-D) curves are used to dissect the transition from B-form to S-form, the melting from double stranded (ds) to single stranded (ss) DNA, and its Young's modulus as well as persistence length. The melt from dsDNA to ssDNA is evidenced by fitting with freely jointed chain (FJC) model. FJC fit and Young's modulus or persistence length values when the molecules are fixed on alkylthiol/substrate are more agreeable with other studies than those on APTES. We have clarified the different results of those experiments by analyzing the binding force between DNA molecules and APTES or alkylthiol linkers on the substrate. The DNA binding to APTES linker is much stronger than that on alkylthiol/substrate.
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Affiliation(s)
- T H Nguyen
- National Research Laboratory, Department of Physics and Nanoscience, Sun Moon University, Asan 336-708, Korea
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Abstract
BACKGROUND Although electrophysiological tests and brain MRI provide information about the site of the lesion in Bell's palsy, clinicians usually depend on clinical data. However, the accuracy of clinical findings in identifying lesions has never been evaluated. METHOD A total of 57 patients with idiopathic peripheral facial palsy were included in this study. We determined the sites of the lesions based on associated symptoms and by brain MRI. We then compared the two to assess the value of clinical findings in determining lesion sites. RESULTS Of the 57 patients, 27 were men. The mean age of all patients was 50.6+/-16.7 years. The lesion sites determined from clinical findings were as follows: the infrageniculate-suprastapedial segment, 13 (23%); the infrastapedial-suprachordal segment, 9 (16%); and the mastoid segment, 35 (61%). No sites were classified as involving the suprageniculate segment. On brain MRI, 51 (89%) of the 57 patients showed abnormal enhancement of the facial nerve, with the most common area being the suprageniculate segment, including the distal intrameatal, labyrinthine and geniculate ganglion. CONCLUSIONS We demonstrate that clinical history is not helpful in determining the site of a lesion in Bell's palsy. The segment most frequently involved in Bell's palsy is the suprageniculate segment.
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Affiliation(s)
- J I Seok
- Department of Neurology, School of Medicine, Catholic University of Daegu, 3056-6 Daemyeong 4 Dong, Nam-Gu, Daegu 705-718, Korea
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Kim KJ, Lee GH. Acute abdominal pain caused by a prolapsed duodenal polyp that resolved when the polyp broke off spontaneously. Endoscopy 2007; 39 Suppl 1:E92-3. [PMID: 17440868 DOI: 10.1055/s-2007-966455] [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] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- K J Kim
- Department of Gastroenterology, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan, South Korea.
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Kawamura M, Wright FAC, Declerck D, Freire MCM, Hu DY, Honkala E, Lévy G, Kalwitzki M, Polychronopoulou A, Yip HK, Kinirons MJ, Eli I, Petti S, Komabayashi T, Kim KJ, Razak AAA, Srisilapanan P, Kwan SYL. An exploratory study on cultural variations in oral health attitudes, behaviour and values of freshman (first-year) dental students. Int Dent J 2005; 55:205-11. [PMID: 16167608 DOI: 10.1111/j.1875-595x.2005.tb00317.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [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: 11/29/2022] Open
Abstract
OBJECTIVE To identify similarities and differences in oral health attitudes, behaviour and values among freshman dental students. DESIGN Cross-cultural survey of dental students. SETTING 18 cultural areas. PARTICIPANTS AND METHODS 904 first-year dental students completed the Hiroshima University-Dental Behavioural Inventory (HU-DBI) translated into their own languages. Individual areas were clustered by similarity in responses to the questions. RESULTS The first group displayed an 'occidental-culture orientation' with the exception of Brazil (Cluster 1 comprised: Australia, United Kingdom, Ireland, Belgium and Brazil, Cluster 2: Germany, Italy, Finland and France). The second group displayed an 'oriental-cultural orientation' with the exception of Greece and Israel (Cluster 3 comprised: China and Indonesia, and Cluster 4: Japan, Korea, Israel, Hong Kong, Malaysia, Thailand and Greece). Australia and United Kingdom were the countries that were most alike. Ireland was the 'neighbour' to these countries. Greece and Malaysia had similar patterns of oral health behaviour although geographic conditions are very different. Although it was considered that in Hong Kong, occidental nations have affected the development of education, it remained in the oriental-culture group. Comparison with the data from the occidentals indicates that a higher percentage of the orientals put off going to the dentist until they have toothache (p < 0.001). Only a small proportion of the occidentals (8%) reported a perception of inevitability in having false teeth, whereas 33% of the orientals held this fatalistic belief (p = 0.001). CONCLUSIONS Grouping the countries into key cultural orientations and international clusters yielded plausible results, using the HU-DBI.
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Affiliation(s)
- M Kawamura
- Preventive Dentistry, Hiroshima University Hospital, Japan.
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Abstract
Chromosome aberration frequency and lipid peroxidation levels were analyzed to investigate their efficacy as biological markers for monitoring the genotoxicity and oxidative damage in Korean chromium (Cr)-exposed workers. Fifty-one Cr-exposed workers and 31 age-matched controls in ten chrome-plating plants were sampled. The Cr level was measured in the workers' blood and urine, and in the ambient air at the workplaces. The conventional Giemsa staining method and fluorescence in situ hybridization (FISH) technique were used for chromosome aberration analysis. Spectrum green whole chromosome paint specific for chromosome 4 was used in the FISH procedure. As for lipid peroxidation, malondialdehyde (MDA) was measured in the blood plasma as thiobarbituric acid-reactive substances (TBARS). The blood Cr concentration was statistically correlated with both the frequency of chromatid exchange and the total frequency of chromosome/chromatid breaks and exchanges, as detected by the Giemsa staining. Meanwhile, the frequency of translocation, as detected by the FISH technique, was significantly higher in the Cr-exposed workers than in the controls and it correlated with the blood Cr concentration. Although the concentration of MDA, the metabolite of lipid peroxidation, in the exposed workers was higher than that of the controls, no statistically significant correlation between the MDA level and the blood or urine Cr levels was observed. Accordingly, the genotoxicity and oxidative damage (plasma lipid peroxidation) in the Korean Cr-exposed workers were consequential at quite low exposure levels, plus chromosome rearrangement, especially translocation, was clearly evident as a biological response marker for Cr exposure based on a significant positive correlation between the translocations detected by FISH and the Cr in the blood.
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Affiliation(s)
- S H Maeng
- Center for Occupational Toxicology, Occupational Safety & Health Research Institute, Korea Occupational Safety & Health Agency, 104-8 Munji-dong, Yuseong-gu, Daejeon 305-380, Korea
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