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Park BG, Kim YJ, Min JH, Cheong TC, Nam SH, Cho NH, Kim YK, Lee KB. Assessment of Cellular Uptake Efficiency According to Multiple Inhibitors of Fe 3O 4-Au Core-Shell Nanoparticles: Possibility to Control Specific Endocytosis in Colorectal Cancer Cells. Nanoscale Res Lett 2020; 15:165. [PMID: 32804261 PMCID: PMC7431494 DOI: 10.1186/s11671-020-03395-w] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Accepted: 08/03/2020] [Indexed: 05/03/2023]
Abstract
Magnetite (Fe3O4)-gold (Au) core-shell nanoparticles (NPs) have unique magnetic and optical properties. When combined with biological moieties, these NPs can offer new strategies for biomedical applications, such as drug delivery and cancer targeting. Here, we present an effective method for the controllable cellular uptake of magnetic core-shell NP systems combined with biological moieties. Vimentin, which is the structural protein, has been biochemically confirmed to affect phagocytosis potently. In addition, vimentin affects exogenic materials internalization into cells even though under multiple inhibitions of biological moieties. In this study, we demonstrate the cellular internalization performance of Fe3O4-Au core-shell NPs with surface modification using a combination of biological moieties. The photofluorescence of vimentin-tagged NPs remained unaffected under multiple inhibition tests, indicating that the NPs were minimally influenced by nystatin, dynasore, cytochalasin D, and even the Muc1 antibody (Ab). Consequently, this result indicates that the Muc1 Ab can target specific molecules and can control specific endocytosis. Besides, we show the possibility of controlling specific endocytosis in colorectal cancer cells.
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Affiliation(s)
- Bo Gi Park
- Department of Biomedical Engineering, College of Health Science, Korea University, Seoul, 02841, South Korea
| | - Yu Jin Kim
- Institute for High Technology Materials and Devices, College of Engineering, Korea University, Seoul, 02841, South Korea
| | - Ji Hyun Min
- Department of Materials Science and Engineering, College of Engineering, Korea University, Seoul, 02841, South Korea
| | - Taek-Chin Cheong
- Department of Microbiology and Immunology, College of Medicine, Seoul National University, Seoul, 03080, South Korea
| | - Sang Hwan Nam
- Center for Convergent Research of Emerging Virus Infection, Korea Research Institute of Chemical Technology, Daejeon, 34114, South Korea
| | - Nam-Hyuk Cho
- Department of Microbiology and Immunology, College of Medicine, Seoul National University, Seoul, 03080, South Korea
| | - Young Keun Kim
- Department of Materials Science and Engineering, College of Engineering, Korea University, Seoul, 02841, South Korea.
| | - Kyu Back Lee
- Department of Biomedical Engineering, College of Health Science, Korea University, Seoul, 02841, South Korea.
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Lee SH, Kim Y, Jang H, Min JH, Oh J, Jang E, Kim D. The effects of discrete and gradient mid-shell structures on the photoluminescence of single InP quantum dots. Nanoscale 2019; 11:23251-23258. [PMID: 31782468 DOI: 10.1039/c9nr06847c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We investigated the dependence of the spectral diffusion and blinking behaviors of indium phosphide (InP) based core/shell/shell quantum dots (QDs) on their mid-shell compositions. We synthesized two types of core/shell/shell QDs having different mid-shell structures by controlling the shell thickness, the total sizes, and the selenium to sulfur ratios. The QDs with a discrete mid-shell (DS-QDs) exhibited a higher photoluminescence (PL) quantum yield (QY) and a narrower PL linewidth than the QDs with a gradient mid-shell (GS-QDs). By analyzing X-ray diffraction (XRD) patterns, and Raman spectra, we found that GS-QDs showed a larger lattice mismatch between the core and the shell than DS-QDs. Also, the spectral diffusion, PL blinking, Auger ionization efficiencies, and the lifetime blinking behavior on single QDs revealed that DS-QDs were nearly unaffected by the defect traps.
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Affiliation(s)
- Sang Hyeon Lee
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Yongwook Kim
- Inorganic Material Lab, Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea.
| | - Hyosook Jang
- Inorganic Material Lab, Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea.
| | - Ji Hyun Min
- Inorganic Material Lab, Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea.
| | - Juwon Oh
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
| | - Eunjoo Jang
- Inorganic Material Lab, Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea.
| | - Dongho Kim
- Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
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Min JH, Kang TW, Cha DI, Song KD, Lee MW, Rhim H, Sinn DH, Kim JM, Sohn I. Radiofrequency ablation versus surgical resection for multiple HCCs meeting the Milan criteria: propensity score analyses of 10-year therapeutic outcomes. Clin Radiol 2018; 73:676.e15-676.e24. [PMID: 29709236 DOI: 10.1016/j.crad.2018.02.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2017] [Accepted: 02/13/2018] [Indexed: 02/06/2023]
Abstract
AIM To assess the long-term therapeutic outcomes of radiofrequency ablation (RFA) versus surgical resection (SR) as a first-line treatment for patients meeting the Milan criteria with multiple hepatocellular carcinomas (HCCs). MATERIALS AND METHODS This retrospective study was approved by the institutional review board and the requirement for informed consent was waived. Between January 2004 and December 2009, among 3,441 patients with treatment-naive HCCs, 88 patients meeting the Milan criteria with multiple HCCs (Barcelona Clinic Liver Cancer [BCLC] A stage) who underwent either RFA (n=62) or SR (n=26) were included. Recurrence-free survival (RFS) and overall survival (OS) rates were compared by using propensity score matching. In addition, multivariate analysis was performed for assess the prognostic factor. RESULTS Matching yielded 20 matched pairs of patients. In the two matched groups, the RFS rates were 30% and 30% at 5- and 10-years, respectively, in the RFA group and 60% and 48.6% in the SR group (p=0.054). The corresponding OS rates were 63.3% and 46.1% in the RFA group and 100% and 73.6% in the SR group, respectively (p=0.061). In multivariate analysis, treatment type was independently associated with RFS (hazard ratio [HR]=0.51; p=0.043) whereas it was not a statistically significant factor for OS (HR=0.50; p=0.088). CONCLUSION In patients meeting the Milan criteria with multiple HCCs (BCLC A stage), SR may provide better RFS compared to RFA.
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Affiliation(s)
- J H Min
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - T W Kang
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
| | - D I Cha
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - K D Song
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - M W Lee
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - H Rhim
- Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - D H Sinn
- Division of Hepatology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - J M Kim
- Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - I Sohn
- Biostatistics and Clinical Epidemiology Center, Samsung Biomedical Research Institute, Seoul, Republic of Korea
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Jang JY, Min JH, Wang SB, Chae YH, Baek JY, Kim M, Ryu JS, Chang TS. Resveratrol inhibits collagen-induced platelet stimulation through suppressing NADPH oxidase and oxidative inactivation of SH2 domain-containing protein tyrosine phosphatase-2. Free Radic Biol Med 2015; 89:842-51. [PMID: 26482867 DOI: 10.1016/j.freeradbiomed.2015.10.413] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [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: 05/06/2015] [Revised: 10/05/2015] [Accepted: 10/14/2015] [Indexed: 11/18/2022]
Abstract
Reactive oxygen species (ROS) produced upon collagen stimulation are implicated in propagating various platelet-activating pathways. Among ROS-producing enzymes, NADPH oxidase (NOX) is largely responsible for collagen receptor-dependent ROS production. Therefore, NOX has been proposed as a novel target for the development of antiplatelet agent. We here investigate whether resveratrol inhibits collagen-induced NOX activation and further examine the effects of resveratrol on ROS-dependent signaling pathways in collagen-stimulated platelets. Collagen-induced superoxide anion production in platelets was inhibited by resveratrol. Resveratrol suppressed collagen-induced phosphorylation of p47(phox), a major regulatory subunit of NOX. Correlated with the inhibitory effects on NOX, resveratrol protected SH2 domain-containing protein tyrosine phosphatase-2 (SHP-2) from ROS-mediated inactivation and subsequently attenuated the specific tyrosine phosphorylation of key components (spleen tyrosine kinase, Vav1, Bruton's tyrosine kinase, and phospholipase Cγ2) for collagen receptor signaling cascades. Resveratrol also inhibited downstream responses such as cytosolic calcium elevation, P-selectin surface exposure, and integrin-αIIbβ3 activation. Furthermore, resveratrol inhibited platelet aggregation and adhesion in response to collagen. The antiplatelet effects of resveratrol through the inhibition of NOX-derived ROS production and subsequent oxidative inactivation of SHP-2 suggest that resveratrol is a potential compound for prevention and treatment of thrombovascular diseases.
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Affiliation(s)
- Ji Yong Jang
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Ji Hyun Min
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Su Bin Wang
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Yun Hee Chae
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Jin Young Baek
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Myunghee Kim
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Jae-Sang Ryu
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea
| | - Tong-Shin Chang
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750, Republic of Korea.
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Wang SB, Jang JY, Chae YH, Min JH, Baek JY, Kim M, Park Y, Hwang GS, Ryu JS, Chang TS. Kaempferol suppresses collagen-induced platelet activation by inhibiting NADPH oxidase and protecting SHP-2 from oxidative inactivation. Free Radic Biol Med 2015; 83:41-53. [PMID: 25645952 DOI: 10.1016/j.freeradbiomed.2015.01.018] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [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: 09/22/2014] [Revised: 01/08/2015] [Accepted: 01/21/2015] [Indexed: 12/24/2022]
Abstract
Reactive oxygen species (ROS) generated upon collagen stimulation act as second messengers to propagate various platelet-activating events. Among the ROS-generating enzymes, NADPH oxidase (NOX) plays a prominent role in platelet activation. Thus, NOX has been suggested as a novel target for anti-platelet drug development. Although kaempferol has been identified as a NOX inhibitor, the influence of kaempferol on the activation of platelets and the underlying mechanism have never been investigated. Here, we studied the effects of kaempferol on NOX activation, ROS-dependent signaling pathways, and functional responses in collagen-stimulated platelets. Superoxide anion generation stimulated by collagen was significantly inhibited by kaempferol in a concentration-dependent manner. More importantly, kaempferol directly bound p47(phox), a major regulatory subunit of NOX, and significantly inhibited collagen-induced phosphorylation of p47(phox) and NOX activation. In accordance with the inhibition of NOX, ROS-dependent inactivation of SH2 domain-containing protein tyrosine phosphatase-2 (SHP-2) was potently protected by kaempferol. Subsequently, the specific tyrosine phosphorylation of key components (Syk, Vav1, Btk, and PLCγ2) of collagen receptor signaling pathways was suppressed by kaempferol. Kaempferol also attenuated downstream responses, including cytosolic calcium elevation, P-selectin surface exposure, and integrin-αIIbβ3 activation. Ultimately, kaempferol inhibited platelet aggregation and adhesion in response to collagen in vitro and prolonged in vivo thrombotic response in carotid arteries of mice. This study shows that kaempferol impairs collagen-induced platelet activation through inhibition of NOX-derived ROS production and subsequent oxidative inactivation of SHP-2. This effect suggests that kaempferol has therapeutic potential for the prevention and treatment of thrombovascular diseases.
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Affiliation(s)
- Su Bin Wang
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Ji Yong Jang
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Yun Hee Chae
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Ji Hyun Min
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Jin Young Baek
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Myunghee Kim
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Yunjeong Park
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Gwi Seo Hwang
- Lab of Cell Differentiation Research, College of Oriental Medicine, Gachon University, Seongnam 461-701, Republic of Korea
| | - Jae-Sang Ryu
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea
| | - Tong-Shin Chang
- Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Women's University, Seoul 120-750, Republic of Korea.
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Jang JY, Wang SB, Min JH, Chae YH, Baek JY, Yu DY, Chang TS. Peroxiredoxin II is an antioxidant enzyme that negatively regulates collagen-stimulated platelet function. J Biol Chem 2015; 290:11432-42. [PMID: 25802339 DOI: 10.1074/jbc.m115.644260] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [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: 02/08/2015] [Indexed: 12/16/2022] Open
Abstract
Collagen-induced platelet signaling is mediated by binding to the primary receptor glycoprotein VI (GPVI). Reactive oxygen species produced in response to collagen have been found to be responsible for the propagation of GPVI signaling pathways in platelets. Therefore, it has been suggested that antioxidant enzymes could down-regulate GPVI-stimulated platelet activation. Although the antioxidant enzyme peroxiredoxin II (PrxII) has emerged as having a role in negatively regulating signaling through various receptors by eliminating H2O2 generated upon receptor stimulation, the function of PrxII in collagen-stimulated platelets is not known. We tested the hypothesis that PrxII negatively regulates collagen-stimulated platelet activation. We analyzed PrxII-deficient murine platelets. PrxII deficiency enhanced GPVI-mediated platelet activation through the defective elimination of H2O2 and the impaired protection of SH2 domain-containing tyrosine phosphatase 2 (SHP-2) against oxidative inactivation, which resulted in increased tyrosine phosphorylation of key components for the GPVI signaling cascade, including Syk, Btk, and phospholipase Cγ2. Interestingly, PrxII-mediated antioxidative protection of SHP-2 appeared to occur in the lipid rafts. PrxII-deficient platelets exhibited increased adhesion and aggregation upon collagen stimulation. Furthermore, in vivo experiments demonstrated that PrxII deficiency facilitated platelet-dependent thrombus formation in injured carotid arteries. This study reveals that PrxII functions as a protective antioxidant enzyme against collagen-stimulated platelet activation and platelet-dependent thrombosis.
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Affiliation(s)
- Ji Yong Jang
- From the Graduate School of Pharmaceutical Sciences and
| | - Su Bin Wang
- From the Graduate School of Pharmaceutical Sciences and
| | - Ji Hyun Min
- From the Graduate School of Pharmaceutical Sciences and
| | - Yun Hee Chae
- From the Graduate School of Pharmaceutical Sciences and
| | | | - Dae-Yeul Yu
- the Disease Model Research Laboratory, Aging Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 605-806, Korea
| | - Tong-Shin Chang
- From the Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University, 52 Ewhayeodae-gil, Seodaemun-gu, Seoul 120-750 and
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Yun JW, Yoon JH, Kang BC, Cho NH, Seok SH, Min SK, Min JH, Che JH, Kim YK. The toxicity and distribution of iron oxide-zinc oxide core-shell nanoparticles in C57BL/6 mice after repeated subcutaneous administration. J Appl Toxicol 2015; 35:593-602. [DOI: 10.1002/jat.3102] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 11/16/2014] [Accepted: 11/17/2014] [Indexed: 11/06/2022]
Affiliation(s)
- Jun-Won Yun
- Department of Experimental Animal Research, Biomedical Research Institute; Seoul National University Hospital; Seoul Republic of Korea
| | - Jung-Hee Yoon
- Department of Experimental Animal Research, Biomedical Research Institute; Seoul National University Hospital; Seoul Republic of Korea
| | - Byeong-Cheol Kang
- Department of Experimental Animal Research, Biomedical Research Institute; Seoul National University Hospital; Seoul Republic of Korea
- Graduate School of Translational Medicine; Seoul National University College of Medicine; Seoul Republic of Korea
- Biomedical Center for Animal Resource and Development, Bio-Max Institute; Seoul National University; Seoul Republic of Korea
- Designed Animal and Transplantation Research Institute; Seoul National University; Pyeongchang-gun Gangwon-do Republic of Korea
| | - Nam-Hyuk Cho
- Department of Microbiology and Immunology, Department of Biomedical Sciences; Seoul National University College of Medicine and Bundang Hospital; Seoul Republic of Korea
| | - Seung Hyeok Seok
- Department of Microbiology and Immunology; Seoul National University College of Medicine; Seoul Republic of Korea
| | - Seung-Kee Min
- Department of Surgery; Seoul National University College of Medicine; Seoul Republic of Korea
| | - Ji Hyun Min
- Department of Materials Science and Engineering; Korea University; Seoul Republic of Korea
| | - Jeong-Hwan Che
- Department of Experimental Animal Research, Biomedical Research Institute; Seoul National University Hospital; Seoul Republic of Korea
- Biomedical Center for Animal Resource and Development, Bio-Max Institute; Seoul National University; Seoul Republic of Korea
| | - Young Keun Kim
- Department of Materials Science and Engineering; Korea University; Seoul Republic of Korea
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Abstract
AIM To evaluate the inhibitory effects of the sports drink containing nano-sized hydroxyapatite (nano-HA) on dental erosion in situ. DESIGN The study had a single-blind, two-treatment crossover design. The two treatment groups were a control group (CG; Powerade only) and an experimental group (EG; 0.25% wt/vol nano-HA was added to Powerade). Ten subjects wore removable palatal appliances containing bovine enamel specimens. The appliances were immersed in each drink for 10 mins, 4 times a day for 10 days. The tooth surface microhardness (SMH) was tested, and the erosion depth and the morphology of the tooth surface were observed. The data were analysed by repeated measures anova and t-test. RESULTS Between the baseline and the 10th day, SMH was decreased by 80% in the specimens of the CG (P < 0.001), whereas there was only a 6% decrease in the SMH of the specimens in the EG. An erosion depth of 12.70 ± 4.66 μm and an irregular tooth surface were observed on the 10th day in the specimens of the CG. No dental erosions, however, was observed in the specimens of the EG. CONCLUSIONS The sports drink containing 0.25% nano-HA was effective in preventing dental erosion in situ.
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Affiliation(s)
- Ji Hyun Min
- Department of Preventive Dentistry and Public Oral Health, Oral Science Research Institute, BK 21 Plus Project, Yonsei University College of Dentistry, Seoul, South Korea
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Kim SH, Min JH, Lee JY. How to Differentiate Inactive from Active Disease in Patients of Primary Multidrug-resistant Tuberculosis with Persistent Cavity after Anti-tuberculous Therapy. Hong Kong J Radiol 2014. [DOI: 10.12809/hkjr1413228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Min JH, Cho JU, An BH, Choi DS, Kimlr YK. Magnetic nanodiscs fabricated from multilayered nanowires. J Nanosci Nanotechnol 2014; 14:7923-7928. [PMID: 25942895 DOI: 10.1166/jnn.2014.9437] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report a simple, high throughput synthesis method of producing magnetic nanodiscs, in which the diameter and thickness are easily controlled. This method consists of two steps: (1) Electrodeposition for growing multilayered nanowires and (2) Selective etching of sacrificial layers. The electrodeposition step results in a bundle of multilayered nanowires. The nanowires consist of alternating layers of magnetic (e.g., Co) and sacrificial materials (e.g., Cu) inside the nanometer-sized pores of an anodized aluminum oxide (AAO) template. The diameter of each layer is determined by pore size, while the thickness is controlled by electrodeposition time. The selective wet etching step removes sacrificial layers, leaving the magnetic nanodiscs. Through this process, the magnetic nanodiscs are fabricated with aspect ratios ranging from 0.25 to 2.0.
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Jang JY, Min JH, Chae YH, Baek JY, Wang SB, Park SJ, Oh GT, Lee SH, Ho YS, Chang TS. Reactive oxygen species play a critical role in collagen-induced platelet activation via SHP-2 oxidation. Antioxid Redox Signal 2014; 20:2528-40. [PMID: 24093153 PMCID: PMC4025609 DOI: 10.1089/ars.2013.5337] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [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: 12/19/2022]
Abstract
AIMS The collagen-stimulated generation of reactive oxygen species (ROS) regulates signal transduction in platelets, although the mechanism is unclear. The major targets of ROS include protein tyrosine phosphatases (PTPs). ROS-mediated oxidation of the active cysteine site in PTPs abrogates the PTP catalytic activity. The aim of this study was to elucidate whether collagen-induced ROS generation leads to PTP oxidation, which promotes platelet stimulation. RESULTS SH2 domain-containing PTP-2 (SHP-2) is oxidized in platelets by ROS produced upon collagen stimulation. The oxidative inactivation of SHP-2 leads to the enhanced tyrosine phosphorylation of spleen tyrosine kinase (Syk), Vav1, and Bruton's tyrosine kinase (Btk) in the linker for the activation of T cells signaling complex, which promotes the tyrosine phosphorylation-mediated activation of phospholipase Cγ2 (PLCγ2). Moreover, we found that, relative to wild-type platelets, platelets derived from glutathione peroxidase 1 (GPx1)/catalase double-deficient mice showed enhanced cellular ROS levels, oxidative inactivation of SHP-2, and tyrosine phosphorylation of Syk, Vav1, Btk, and PLCγ2 in response to collagen, which subsequently led to increased intracellular calcium levels, degranulation, and integrin αIIbβ3 activation. Consistent with these findings, GPx1/catalase double-deficiency accelerated the thrombotic response in FeCl3-injured carotid arteries. INNOVATION The present study is the first to demonstrate that SHP-2 is targeted by ROS produced in collagen-stimulated platelets and suggests that a novel mechanism for the regulation of platelet activation by ROS is due to oxidative inactivation of SHP-2. CONCLUSION We conclude that collagen-induced ROS production leads to SHP-2 oxidation, which promotes platelet activation by upregulating tyrosine phosphorylation-based signal transduction.
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Affiliation(s)
- Ji Yong Jang
- 1 Graduate School of Pharmaceutical Sciences and College of Pharmacy, Ewha Womans University , Seoul, South Korea
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Kim SH, Min JH, Lee JY. Radiological Findings of Primary Multidrug-resistant Pulmonary Tuberculosis in HIV-seronegative Patients. Hong Kong J Radiol 2014. [DOI: 10.12809/hkjr1413213] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Yoon H, Lee JS, Min JH, Wu J, Kim YK. Synthesis, microstructure, and magnetic properties of monosized MnxZnyFe3 - x - yO4 ferrite nanocrystals. Nanoscale Res Lett 2013; 8:530. [PMID: 24344630 PMCID: PMC3878439 DOI: 10.1186/1556-276x-8-530] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Accepted: 12/09/2013] [Indexed: 05/27/2023]
Abstract
We report the synthesis and characterization of ferrite nanocrystals which exhibit high crystallinity and narrow size distributions. The three types of samples including Zn ferrite, Mn ferrite, and Mn-Zn ferrite were prepared via a non-aqueous nanoemulsion method. The structural, chemical, and magnetic properties of the nanocrystals are analyzed by transmission electron microscopy, X-ray diffraction, X-ray fluorescence, and physical property measurement system. The characterization indicates that the three types of ferrite nanocrystals were successfully produced, which show well-behaved magnetic properties, ferrimagnetism at 5 K and superparamagnetism at 300 K, respectively. In addition, the magnetization value of the ferrites increases with the increasing concentration of Mn.
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Affiliation(s)
- Hayoung Yoon
- Department of Materials Science and Engineering, Korea University, Seoul 136-713, Republic of Korea
| | - Ji Sung Lee
- Department of Materials Science and Engineering, Korea University, Seoul 136-713, Republic of Korea
| | - Ji Hyun Min
- Department of Materials Science and Engineering, Korea University, Seoul 136-713, Republic of Korea
| | - JunHua Wu
- Pioneer Research Center for Biomedical Nanocrystals, Korea University, Seoul 136-713, Republic of Korea
| | - Young Keun Kim
- Department of Materials Science and Engineering, Korea University, Seoul 136-713, Republic of Korea
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Ahn JH, Park JR, Min JH, Sohn JT, Hwang SJ, Park Y, Koh JS, Jeong YH, Kwak CH, Hwang JY. Risk Stratification Using Computed Tomography Coronary Angiography in Patients Undergoing Intermediate-Risk Noncardiac Surgery. J Am Coll Cardiol 2013; 61:661-8. [DOI: 10.1016/j.jacc.2012.09.060] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 09/12/2012] [Accepted: 09/16/2012] [Indexed: 11/15/2022]
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15
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Ahn JH, Koh JS, Park JR, Park MJ, Min JH, Cho SY, Lee EJ, Kim WC, Kim KH. Isolated left ventricular noncompaction with a congenital aneurysm presenting with recurrent embolism. J Cardiovasc Ultrasound 2012; 20:103-7. [PMID: 22787529 PMCID: PMC3391626 DOI: 10.4250/jcu.2012.20.2.103] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [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: 02/26/2012] [Revised: 04/03/2012] [Accepted: 05/15/2012] [Indexed: 11/22/2022] Open
Abstract
Isolated left ventricular noncompaction (LVNC) is a rare disorder caused by embryonic arrest of compaction. LVNC is sometimes associated with other congenital cardiac disorders; however, there have been few reports of its coexistence with a left ventricular aneurysm. A 40-year-old woman was admitted to our hospital for renal infarction. She had a history of embolic cerebral infarction 10 years ago. Transthoracic echocardiography showed prominent trabeculae and deep intertrabecular recesses which are filled with blood from the left ventricular (LV) cavity. A thrombus in the akinetic apical wall was confirmed by contrast echocardiography. Using cardiac computed tomography and magnetic resonance imaging, we rejected a possible diagnosis of suspicion of coronary artery disease. She was diagnosed LVNC with a thrombus in apical aneurysm. Here, we report the first patient in Korea known to have LVNC accompanying LV congenital aneurysm presenting with recurrent embolism.
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Affiliation(s)
- Jong-Hwa Ahn
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
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16
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Carroll MW, Lee M, Cai Y, Hallahan CW, Shaw PA, Min JH, Goldfeder LC, Alekseyev V, Grinkrug S, Kang HS, Hwang S, Park HM, Kang E, Lee SY, Jin B, Park HE, Min S, Park SK, Jeon DS, Via LE, Barry CE. Frequency of adverse reactions to first- and second-line anti-tuberculosis chemotherapy in a Korean cohort. Int J Tuberc Lung Dis 2012; 16:961-6. [PMID: 22584241 DOI: 10.5588/ijtld.11.0574] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE To determine the frequency of and risk factors for major adverse drug reactions (MADRs) associated with anti-tuberculosis treatment at a tuberculosis (TB) referral hospital in the Republic of Korea. METHODS Data from an ongoing natural history cohort study were analyzed for permanent regimen changes due to adverse drug reactions and confirmed by chart review. RESULTS Among 655 subjects, there were 132 MADRs in 112 (17%) subjects. The most common MADRs were gastrointestinal (n = 53), musculoskeletal (n = 22), psychiatric (n = 10), visual (n = 9) and peripheral neuropathic (n = 8). MADRs were more frequent in subjects being treated with second-line regimens (16%) compared to first-line regimens (2.5%). Drugs frequently associated with MADRs were amikacin (3/10, 30%), linezolid (8/29, 28%), para-aminosalicylic acid (47/192, 24%), pyrazinamide (31/528, 5.8%), macrolides (2/44, 4.5%) and cycloserine (12/272, 4.4%). Fluoroquinolones accounted for a single MADR (1/377, 0.003%), despite widespread usage. In multivariate analysis, infection with multi- or extensively drug-resistant disease and previous history of anti-tuberculosis treatment were risk factors for MADR, with adjusted hazard ratios of respectively 2.2 (P = 0.02) and 1.6 (P = 0.04). CONCLUSION MADRs are common during anti-tuberculosis chemotherapy in this population, occurring in more than one in six subjects. New and less toxic agents to treat drug-resistant TB are urgently needed.
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Affiliation(s)
- M W Carroll
- International Tuberculosis Research Center, Masan, Republic of Korea
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Kwon TJ, Hwang JY, Kwak CH, Jeong YH, Park YW, Hwang SJ, Park JR, Ahn JH, Min JH. Rupture and Spontaneous Sealing of a Coronary Aneurysm After Deployment of Drug-Eluting Stent. Korean Circ J 2012; 42:558-61. [PMID: 22977452 PMCID: PMC3438266 DOI: 10.4070/kcj.2012.42.8.558] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 09/06/2011] [Revised: 11/22/2011] [Accepted: 01/16/2012] [Indexed: 11/11/2022] Open
Abstract
Lesions with coronary artery aneurysm (CAA) can become complicated during percutaneous coronary intervention. Here, we report a case of a 78-year-old man who developed a rupture, and spontaneous sealing of the CAA occurred after stent implantation, as shown by computed tomography coronary angiography.
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Affiliation(s)
- Tae Jung Kwon
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Jin Yong Hwang
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Choong Hwan Kwak
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Young-Hoon Jeong
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Yong Whi Park
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Seok-Jae Hwang
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Jeong Rang Park
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Jong-Hwa Ahn
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
| | - Ji Hyun Min
- Department of Internal Medicine, Gyeongsang National University Hospital, Jinju, Korea
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Cho NH, Cheong TC, Min JH, Wu JH, Lee SJ, Kim D, Yang JS, Kim S, Kim YK, Seong SY. A multifunctional core-shell nanoparticle for dendritic cell-based cancer immunotherapy. Nat Nanotechnol 2011; 6:675-682. [PMID: 21909083 DOI: 10.1038/nnano.2011.149] [Citation(s) in RCA: 326] [Impact Index Per Article: 25.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 08/04/2011] [Indexed: 05/28/2023]
Abstract
Dendritic cell-based cancer immunotherapy requires tumour antigens to be delivered efficiently into dendritic cells and their migration to be monitored in vivo. Nanoparticles have been explored as carriers for antigen delivery, but applications have been limited by the toxicity of the solvents used to make nanoparticles, and by the need to use transfection agents to deliver nanoparticles into cells. Here we show that an iron oxide-zinc oxide core-shell nanoparticle can deliver carcinoembryonic antigen into dendritic cells while simultaneously acting as an imaging agent. The nanoparticle-antigen complex is efficiently taken up by dendritic cells within one hour and can be detected in vitro by confocal microscopy and in vivo by magnetic resonance imaging. Mice immunized with dendritic cells containing the nanoparticle-antigen complex showed enhanced tumour antigen specific T-cell responses, delayed tumour growth and better survival than controls.
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Affiliation(s)
- Nam-Hyuk Cho
- Department of Microbiology and Immunology, Seoul National University College of Medicine and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul, Republic of Korea
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19
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Min JH, Kwon HK, Kim BI. The addition of nano-sized hydroxyapatite to a sports drink to inhibit dental erosion: in vitro study using bovine enamel. J Dent 2011; 39:629-35. [PMID: 21763390 DOI: 10.1016/j.jdent.2011.07.001] [Citation(s) in RCA: 45] [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] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 06/30/2011] [Accepted: 07/01/2011] [Indexed: 11/25/2022] Open
Abstract
OBJECTIVES This study examined the dental erosion and demineralization potential of a sports drink containing nano-sized hydroxyapatite (nano-HA) as an additive. METHODS The experimental solutions were Powerade (PA) alone and PA with 0.05%, 0.10%, and 0.25% nano-HA. The pH, titratable acidity, and calcium and phosphate content of each solution were analysed, and the degree of saturation with respect to the dental enamel (DS(En)) was obtained. Twelve sound bovine enamel specimens for each group were treated in accordance with the pH-cycling schedule which had 60min treatment with experimental solution per day for 7 days. The erosion potential was determined from the changes in surface micro hardness (SMH), the depths of erosion and demineralized layer using confocal laser scanning microscopy (CLSM), and the morphological changes to the tooth surface were examined with scanning electron microscopy (SEM) after pH-cycling. RESULTS pH and DS(En) increased with increasing nano-HA concentration in the drinks, whereas the titratable acidity decreased. There were significant differences in the SMH between the PA alone and >0.10% nano-HA groups (p<0.001). Although the PA alone group showed a pronounced erosion depth, CLSM showed no erosion depth in 0.25% nano-HA group. SEM showed an intact surface with increasing nano-HA concentration in the drinks. In conclusion, dental erosion was effectively prevented with increase of adding concentration of nano-HA, and a sports drink containing 0.25% nano-HA might prevent dental erosion.
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Affiliation(s)
- J H Min
- Department of Preventive Dentistry and Public Oral Health, Research Center for Orofacial Hard Tissue Regeneration, College of Dentistry, Yonsei University, Seoul, Republic of Korea
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Liu H, Wu J, Min JH, Hou P, Song AY, Kim YK. Non-aqueous synthesis of water-dispersible Fe3O4-Ca3(PO4)2 core-shell nanoparticles. Nanotechnology 2011; 22:055701. [PMID: 21178225 DOI: 10.1088/0957-4484/22/5/055701] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The Fe(3)O(4)-Ca(3)(PO(4))(2) core-shell nanoparticles were prepared by one-pot non-aqueous nanoemulsion with the assistance of a biocompatible triblock copolymer, poly(ethylene glycol)-block-poly(propylene glycol)-block-poly(ethylene glycol) (PEO-PPO-PEO), integrating the magnetic properties of Fe(3)O(4) and the bioactive functions of Ca(3)(PO(4))(2) into single entities. The Fe(3)O(4) nanoparticles were pre-formed first by thermal reduction of Fe(acac)(3) and then the Ca(3)(PO(4))(2) layer was coated by simultaneous deposition of Ca(2+) and PO(4)(3-). The characterization shows that the combination of the two materials into a core-shell nanostructure retains the magnetic properties and the Ca(3)(PO(4))(2) shell forms an hcp phase (a = 7.490 Å, c = 9.534 Å) on the Fe(3)O(4) surface. The magnetic hysteresis curves of the nanoparticles were further elucidated by the Langevin equation, giving an estimation of the effective magnetic dimension of the nanoparticles and reflecting the enhanced susceptibility response as a result of the surface covering. Fourier transform infrared (FTIR) analysis provides the characteristic vibrations of Ca(3)(PO(4))(2) and the presence of the polymer surfactant on the nanoparticle surface. Moreover, the nanoparticles could be directly transferred to water and the aqueous dispersion-collection process of the nanoparticles was demonstrated for application readiness of such core-shell nanostructures in an aqueous medium. Thus, the construction of Fe(3)O(4) and Ca(3)(PO(4))(2) in the core-shell nanostructure has conspicuously led to enhanced performance and multi-functionalities, offering various possible applications of the nanoparticles.
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Affiliation(s)
- HongLing Liu
- Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng, People's Republic of China
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21
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Lee JM, Song HN, Kang Y, Kim H, Min JH, Suh YS, Ahn JH, Lee SH, Jo YW, Cheon YH, Kim MJ, Lee GW. Isolated mediastinal myeloid sarcoma successfully treated with chemoradiotherapy followed by unrelated allogeneic stem cell transplantation. Intern Med 2011; 50:3003-7. [PMID: 22185993 DOI: 10.2169/internalmedicine.50.6125] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A 22-year-old man was diagnosed with isolated mediastinal myeloid sarcoma which radiologically mimicked primary mediastinal lymphoma. Despite administration of standard remission induction chemotherapy with daunorubicin and cytarabine, and three cycles of intensive high-dose cytarabine-based consolidation, chemo-resistant hypermetabolic lesions were persistently detected in the highest mediastinum and in the supraclavicular area. However, complete remission and long-term survival were achieved by curative radiotherapy followed by unrelated allogeneic stem cell transplantation.
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Affiliation(s)
- Jeong Mi Lee
- Division of Oncology and Hematology Department of Internal Medicine, Gyeongsang National University Hospital, Gyeongsang National University School of Medicine, Korea
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22
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Kim SM, Waters P, Vincent A, Kim SY, Kim HJ, Hong YH, Park KS, Min JH, Sung JJ, Lee KW. Sjögren’s syndrome myelopathy: spinal cord involvement in Sjögren’s syndrome might be a manifestation of neuromyelitis optica. Mult Scler 2009; 15:1062-8. [DOI: 10.1177/1352458509106636] [Citation(s) in RCA: 46] [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: 10/20/2022]
Abstract
Objective To evaluate clinical characteristics, aquaporin (AQP)-4 antibody results, and probability of developing symptoms of neuromyelitis optica (NMO) in patients with Sjögren’s syndrome myelopathy (SSM). Methods We identified eight patients with spinal cord involvement from 112 patients with Sjögren’s syndrome (SS) referred to the neurology department. The clinical characteristics and AQP-4 antibody status, based on immunoprecipitation of EGFP-tagged AQP-4, of the patients with SSM were assessed. Results All patients with SSM had extensive spinal cord lesions, high mean annual relapse rates, and poor response to steroid treatment. Of the eight patients with SSM, seven patients satisfied the revised diagnostic criteria for NMO or showed positive results from AQP-4 antibody testing; one patient had incomplete follow-up. The clinical manifestations and AQP-4 autoantibody status of patients with SSM did not differ significantly from those of NMO patients without SS. Conclusion All patients with SSM had poor prognosis with high mean annual relapse rates, and most seemed to have the clinical and immunological characteristics of NMO. Early aggressive immune therapies should be considered in patients with SSM irrespective of the presence or absence of optic neuritis.
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Affiliation(s)
- SM Kim
- Department of Neurology, Seoul National University, College of Medicine, Seoul, Korea
| | - P Waters
- Neuroscience Group, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - A Vincent
- Neuroscience Group, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - SY Kim
- Department of Neurology, Seoul National University, College of Medicine, Seoul, Korea
| | - HJ Kim
- Department of Neurology, Seoul National University, College of Medicine, Seoul, Korea
| | - YH Hong
- Department of Neurology, Seoul Boramae Hospital, Seoul, Korea
| | - KS Park
- Department of Neurology, Seoul National University, College of Medicine, Seoul, Korea
| | - JH Min
- Department of Neurology, Kwan-Dong University, College of Medicine, Seoul, Korea
| | - JJ Sung
- Department of Neurology, Seoul National University, College of Medicine, Seoul, Korea
| | - KW Lee
- Department of Neurology, Seoul National University, College of Medicine, Seoul, Korea
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23
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Min JH, Kim HJ, Kim BJ, Lee KW, Sunwoo IN, Kim SM, Kim BJ, Kim SH, Park MS, Waters P, Vincent A, Sung JJ, Lee KH. Brain abnormalities in Sjogren syndrome with recurrent CNS manifestations: association with neuromyelitis optica. Mult Scler 2009; 15:1069-76. [DOI: 10.1177/1352458509106228] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background and objectives Optic neuritis or longitudinally extensive myelitis in Sjogren syndrome (SS) suggests a neuromyelitis optica spectrum disorder (NMOSD). However, brain abnormalities of SS remain to be elucidated for the association with neuromyelitis optica (NMO). Methods Twelve primary SS patients (all women, 42 ± 13.2 years) who had recurrent central nervous system (CNS) manifestations with brain involvement were retrospectively identified. Brain MRI, and neurologic and serologic findings were analyzed with the measurement of anti-aquaporin-4 antibody (AQP4-Ab). Results All patients showed brain lesions characteristic of NMO as follows: 1) the involved sites adjacent to the third and fourth ventricles and in the posterior limb of the internal capsule, 2) unique configurations, such as the longitudinal course from the internal capsule to the midbrain, large cerebral or cerebellar lesions over 3 cm, and cavity-like formations. AQP4-Ab was positive in six of eight patients tested, and all the seropositive patients showed lesions with increased diffusion, suggestive of vasogenic edema. Four patients met the revised criteria of NMO, and nine had features of NMOSDs. Of the remaining three patients showing only brain involvement, one had AQP4-Ab. Conclusions This study demonstrates that SS patients with recurrent CNS involvement have brain abnormalities characteristic of NMO and AQP4-Ab in Korea. The presence of AQP4-Ab in one SS patient with only brain involvement may suggest that the coexistence of NMO should be explored in SS patients with recurrent CNS manifestations, even without optic neuritis or myelitis.
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Affiliation(s)
- JH Min
- Department of Neurology, Myongji Hospital, Kwandong University College of Medicine, South Korea
| | - HJ Kim
- Department of Neurology, National Cancer Center, South Korea
| | - BJ Kim
- Department of Neurology, Korea University Medical Center, South Korea
| | - KW Lee
- Department of Neurology, Seoul National University College of Medicine, South Korea
| | - IN Sunwoo
- Department of Neurology, Severance Hospital, Yonsei College of Medicine, South Korea
| | - SM Kim
- Department of Neurology, Severance Hospital, Yonsei College of Medicine, South Korea
| | - BJ Kim
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, South Korea
| | - SH Kim
- Department of Neurology, Hanyang University Hospital, South Korea
| | - MS Park
- Department of Neurology, Chonnam National University Hospital, South Korea
| | - P Waters
- Department of Clinical Neurology, Neuroscience group, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK
| | - A Vincent
- Department of Clinical Neurology, Neuroscience group, Weatherall Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, UK
| | - JJ Sung
- Department of Neurology, Seoul National University College of Medicine, South Korea
| | - KH Lee
- Department of Neurology, Samsung Medical Center, Sungkyunkwan University School of Medicine, South Korea
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Jeon DS, Kim DH, Kang HS, Hwang SH, Min JH, Kim JH, Sung NM, Carroll MW, Park SK. Survival and predictors of outcomes in non-HIV-infected patients with extensively drug-resistant tuberculosis. Int J Tuberc Lung Dis 2009; 13:594-600. [PMID: 19383192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023] Open
Abstract
SETTING A tuberculosis (TB) referral hospital in South Korea. OBJECTIVE To evaluate predictors of treatment outcomes and survival among non-human immunodeficiency virus (HIV) infected patients with extensively drug-resistant TB (XDR-TB). DESIGN Patients who were diagnosed with XDR-TB at the National Masan Tuberculosis Hospital from January 2001 to December 2005 were included in this study. We conducted a retrospective review of their medical records and mortality data. RESULTS A total of 176 non-HIV-infected patients with XDR-TB were included. TB-related mortality was 48% (84/176), and the median survival time from the diagnosis date of XDR-TB was 51 months (range 0-127, 95%CI 32.53-69.47). Cure and treatment completion were classified as favourable outcome and treatment failure, death during treatment and default as poor outcome. Previous TB treatment with second-line drugs (aOR 2.76, 95%CI 1.02-7.44) and cavitary disease (aOR 3.01, 95%CI 1.12-8.08) were independent risk factors for poor outcome. Use of linezolid (aOR 0.10, 95%CI 0.01-0.69) and surgical resection (aOR 0.18, 95%CI 0.04-0.78) were associated with favourable outcome. CONCLUSION There was high mortality in non-HIV-infected patients with XDR-TB at a TB referral hospital in South Korea. Adjunctive surgical treatment and linezolid improved the outcome for selected patients with XDR-TB.
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Affiliation(s)
- D S Jeon
- National Masan Tuberculosis Hospital, Masan, South Korea; and International Tuberculosis Research Center, Masan, South Korea.
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Abstract
We have synthesized highly crystalline, monosized Fe3O4(Fe)/Au magnetic-optic multifunctional nanocrystals using a modified polyol process. The formation of the core-shell structure was achieved in two consecutive steps, seeding the Fe3O4(Fe) core followed by coating the gold shell. The characterization demonstrates the core-shell nanostructure and provides particle size and distribution of the nanocrystals. The spectroscopic analysis gives three Fe oxidation states (Fe0, Fe+2 and Fe+3) in the core and the surface plasmon characteristic of the Au nanoshell, while the magnetic measurements show excellent susceptibility of the nanocrystals.
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Affiliation(s)
- Hong-Ling Liu
- Institute for Nano Science, Korea University, Seoul 136-713, Korea
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26
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Affiliation(s)
- Ju Hun Lee
- Department of Materials Science and Engineering, Korea University, Seoul 136-713, South Korea
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27
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Lee SS, Ahn JR, Kim ND, Min JH, Hwang CG, Chung JW, Yeom HW, Ryjkov SV, Hasegawa S. Adsorbate-induced pinning of a charge-density wave in a quasi-1D metallic chains: Na on the In/Si(111)-(4x1) surface. Phys Rev Lett 2002; 88:196401. [PMID: 12005651 DOI: 10.1103/physrevlett.88.196401] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2001] [Indexed: 05/22/2023]
Abstract
We find that foreign adsorbates acting as local impurities can induce a metal-insulator transition by pinning a charge-density wave (CDW) on the quasi-1D metallic In/Si(111)-(4x1) chain system. Our scanning tunneling microscopy image clearly reveals the presence of a new local 4x2 structure nucleated by Na adatoms at room temperature, which turns out to be insulating with a doubled periodicity along the chains. We directly determine a CDW gap energy Delta = 105+/-8 meV by identifying a characteristic loss peak in our high-resolution electron-energy-loss spectra. We thus report the first observation of a local impurity-derived Peierls-like reconstruction of a quasi-1D system.
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Affiliation(s)
- S S Lee
- Physics Department and Basic Science Research Institute, Pohang University of Science and Technology, San 31 Hyoja Dong, Pohang 790-784, Korea
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Min JH, Wilder C, Aoki J, Arai H, Inoue K, Paul L, Gelb MH. Platelet-activating factor acetylhydrolases: broad substrate specificity and lipoprotein binding does not modulate the catalytic properties of the plasma enzyme. Biochemistry 2001; 40:4539-49. [PMID: 11294621 DOI: 10.1021/bi002600g] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Platelet-activating factor acetylhydrolases (PAF-AHs) are a group of enzymes that hydrolyze the sn-2 acetyl ester of PAF (phospholipase A(2) activity) but not phospholipids with two long fatty acyl groups. Our previous studies showed that membrane-bound human plasma PAF-AH (pPAF-AH) accesses its substrate only from the aqueous phase, which raises the possibility that this enzyme can hydrolyze a variety of lipid esters that are partially soluble in the aqueous phase. Here we show that pPAF-AH has broad substrate specificity in that it hydrolyzes short-chain diacylglycerols, triacylglycerols, and acetylated alkanols, and displays phospholipase A(1) activity. On the basis of all of the substrate specificity results, it appears that the minimal structural requirement for a good pPAF-AH substrate is the portion of a glyceride derivative that includes an sn-2 ester and a reasonably hydrophobic chain in the position occupied by the sn-1 chain. In vivo, pPAF-AH is bound to high and low density lipoproteins, and we show that the apparent maximal velocity for this enzyme is not influenced by lipoprotein binding and that the enzyme hydrolyzes tributyroylglycerol as well as the recombinant pPAF-AH does. Broad substrate specificity is also observed for the structurally homologous PAF-AH which occurs intracellularly [PAF-AH(II)] as well as for the PAF-AH from the lower eukaryote Physarum polycephalum although pPAF-AH and PAF-AH(II) tolerate the removal of the sn-3 headgroup better than the PAF-AH from P. polycephalum does. In contrast, the intracellular PAF-AH found in mammalian brain [PAF-AH(Ib) alpha 1/alpha 1 and alpha 2/alpha 2 homodimers] is more selectively operative on compounds with a short acetyl chain although this enzyme also displays significant phospholipase A(1) activity.
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Affiliation(s)
- J H Min
- Department of Biochemistry and Chemistry, University of Washington, Seattle, Washington 98195, USA
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Gelb MH, Min JH, Jain MK. Do membrane-bound enzymes access their substrates from the membrane or aqueous phase: interfacial versus non-interfacial enzymes. Biochim Biophys Acta 2000; 1488:20-7. [PMID: 11080673 DOI: 10.1016/s1388-1981(00)00106-2] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
For membrane-bound enzymes that act on substrates that partition between the membrane and aqueous phases, it is possible to imagine two fundamentally different mechanisms. Interfacial enzymes must access their substrate from the membrane phase, in other words substrate in the membrane binds directly to the active site of the enzyme at the membrane without mixing with substrate molecules in the aqueous phase. On the other hand, non-interfacial enzymes, either bound to membranes or present in the aqueous phase, must access their substrates from the aqueous phase, i.e. substrate in the aqueous phase binds directly to the enzyme without mixing with substrates in the membrane phase. An interfacial mechanism for some enzymes including secreted and cytosolic phospholipase A(2) and phosphoinositide 3'-hydroxykinase was rigorously proven by demonstrating that these enzymes processively hydrolyze many phospholipids without desorbing from the surface of vesicles (scooting mode). The non-interfacial mechanism is more difficult to establish because it cannot be addressed by steady-state kinetics. Using a pre-steady-state method in which the enzymatic velocity is measured during the time it takes for substrate to exchange between vesicles, a non-interfacial mechanism was proven for vesicle-bound plasma platelet activating factor acetylhydrolase. This enzyme prefers more water-soluble phospholipids such as those with sn-2 acetyl or oxidatively truncated fatty acyl chains, and this is readily explained by the mandatory access of substrate from the aqueous phase.
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Affiliation(s)
- M H Gelb
- Department of Chemistry, University of Washington, Seattle 98195, USA.
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Ahn JR, Lee SS, Kim ND, Min JH, Hwang CG, Chung JW. Observation of disorder-induced 2D mott-hubbard states of the alkali-earth metal (Mg,Ba)-adsorbed Si(111) surface. Phys Rev Lett 2000; 84:1748-1751. [PMID: 11017616 DOI: 10.1103/physrevlett.84.1748] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/1999] [Indexed: 05/23/2023]
Abstract
We report evidence of a disorder-driven Mott-Hubbard-type localization on the alkali-earth metal (AEM) (Mg,Ba)-adsorbed Si(111)-(7x7) surface. The clean metallic Si(111) surface is found to undergo a two-dimensional (2D) metal-insulator transition as randomly distributed AEM adsorbates cause disorder on the surface. A well-defined electron-energy-loss peak unique to the insulating phase is attributed to an interband excitation between the split Hubbard bands originated from a metallic surface band at Fermi energy. A quantitative analysis of the loss peak reveals that the AEM-induced insulating surfaces are of a Mott-Hubbard type driven essentially by disorder.
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Affiliation(s)
- JR Ahn
- Physics Department and Basic Science Research Institute, Pohang University of Science and Technology, San 31 Hyoja Dong, Pohang 790-784, Korea
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Min JH, Jain MK, Wilder C, Paul L, Apitz-Castro R, Aspleaf DC, Gelb MH. Membrane-bound plasma platelet activating factor acetylhydrolase acts on substrate in the aqueous phase. Biochemistry 1999; 38:12935-42. [PMID: 10504265 DOI: 10.1021/bi991149u] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.1] [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: 11/28/2022]
Abstract
Human plasma platelet activating factor acetylhydrolase (pPAF-AH) is a phospholipase A(2) that specifically hydrolyzes the sn-2 ester of platelet activating factor (PAF) and of phospholipids with oxidatively truncated sn-2 fatty acyl chains. pPAF-AH is bound to lipoproteins in vivo, and it binds essentially irreversibly to anionic and zwitterionic phospholipid vesicles in vitro and hydrolyzes PAF and PAF analogues. Substrate hydrolysis also occurs in the absence of vesicles, with a maximum rate reached at the critical micelle concentration. A novel pre-steady-state kinetic analysis with enzyme tightly bound to vesicles and with a substrate that undergoes slow intervesicle exchange establishes that pPAF-AH accesses its substrate from the aqueous phase and thus is not an interfacial enzyme. Such a mechanism readily explains why this enzyme displays dramatic specificity for phospholipids with short sn-2 chains or with medium-length, oxidatively truncated sn-2 chains since a common feature of these lipids is their relatively high water solubility. It also explains why the enzymatic rate drops as the length of the sn-1 chain is increased. pPAF-AH shows broad specificity toward phospholipids with different polar headgroups. Additional results are that PAF undergoes intervesicle exchange on the subminute time scale and it does not undergo transbilayer movement over tens of minutes.
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Affiliation(s)
- J H Min
- Departments of Biochemistry and Chemistry, University of Washington, Seattle, Washington 98195, USA
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Abstract
A successful attempt at percutaneous transluminanl coronary angioplasty (PTCA) to relieve stenosis of the mid-portion of the left anterior descending artery was achieved in a 6-year 9-month old boy who had multiple coronary aneurysms and stenosis due to Kawasaki disease. Despite the progression of coronary stenosis he had been well except for the perfusion defect of the anterior wall of myocardium on 99mTc-MIBI SPECT with dipyridamole infusion until PTCA was carried out after 4-year 4-months of the onset of illness. The area of stenosis was 70% before PTCA and 20% after PTCA. No restenosis at the site of PTCA was observed on follow-up angiography at 26 months after PTCA. This successful attempt may indicate that this procedure should be considered early in subclinical stenosis to prevent ischemic cardiac damage.
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Affiliation(s)
- J H Min
- Department of Pediatrics, Seoul National University College of Medicine, Korea
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