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Kim Y, Son C, Park YK, Jo JH, Park JW. Sleep duration and inflammatory mediator levels associated with long-term prognosis in temporomandibular disorders. J Oral Rehabil 2023. [PMID: 37164342 DOI: 10.1111/joor.13494] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Revised: 03/24/2023] [Accepted: 05/04/2023] [Indexed: 05/12/2023]
Abstract
BACKGROUND Sleep disturbance is a systemic symptom and at the same time a major modulating factor of temporomandibular disorders (TMD). Inflammation is known as a underlying mechanism involved in both poor sleep and increased pain. OBJECTIVE The relationship between long-term clinical characteristics and hematologic biomarkers of hypothalamic-pituitary-adrenal axis activity and inflammation in TMD patients according to sleep duration was investigated to verify the possible role of sleep disturbance and systemic inflammation in TMD. MATERIALS AND METHODS Inflammatory and stress mediator levels of venous blood samples were investigated in 63 female TMD patients along with comorbidity levels including stress, somatization, autonomic symptoms, and sleep quality based on structured questionnaires. Differences in long-term clinical characteristics and hematologic variables following conservative treatment were analyzed according to total sleep time as normal, short, and long sleep groups. Also, clinical and hematologic indices related to favorable treatment response were sought out. RESULTS Significantly less patients in the long sleep group reported pain on voluntary mandibular movement(p=0.042) while depression(p=0.043) and somatization levels(p=0.002) were significantly higher in the short sleep group. Norepinephrine levels of the long sleep group were significantly lower than other groups. Decrease in pain intensity with treatment was smallest in the short sleep group. Erythrocyte sedimentation rate was associated with significant pain improvement at 3-months post-treatment and interleukin-1β, -4, and -8 levels could predict favorable treatment response. CONCLUSION Short sleep is associated with more comorbidities and unfavorable long-term treatment response in TMD which may be mediated by systemic inflammation. Effective management of sleep is necessary for successful TMD management.
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Affiliation(s)
- Yibee Kim
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul, Korea(ROK)
| | - Chunghwan Son
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul, Korea(ROK)
| | - Yoon Kyung Park
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul, Korea(ROK)
- Present address: Department of Ophthalmology, College of Medicine, University of Ulsan, Asan Medical Center, Seoul, Korea(ROK)
| | - Jung Hwan Jo
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul, Korea(ROK)
- Department of Oral Medicine, Seoul National University Dental Hospital, 101, Daehak-ro, Jongno-gu, Seoul, Korea(ROK)
| | - Ji Woon Park
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul, Korea(ROK)
- Department of Oral Medicine, Seoul National University Dental Hospital, 101, Daehak-ro, Jongno-gu, Seoul, Korea(ROK)
- Dental Research Institute, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul, Korea(ROK)
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Jung Y, Jin JH, Jung M, Hwang IS, Vu NT, Park YK, Kim NH, Park KH, Oh CS, Kim D. On-site Applicable Diagnostic Fluorescent Probe for Fire Blight Bacteria. iScience 2023; 26:106557. [PMID: 37102150 PMCID: PMC10123346 DOI: 10.1016/j.isci.2023.106557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Revised: 02/06/2023] [Accepted: 03/27/2023] [Indexed: 04/04/2023] Open
Abstract
Fire blight is a representative plant infection that contaminates edible plants and causes socio-economic problems in agricultural and livestock industries globally. It is caused by the pathogen Erwinia amylovora (E. amylovora) creates lethal plant necrosis and spreads rapidly across plant organs. We newly disclose the fluorogenic probe B-1 for real-time on-site detection of fire blight bacteria for the first time. B-1 exhibited no emission signals but manifested bright emission properties in the presence of fire blight bacteria. Based on these features, fluorescence imaging of the fire blight bacteria and its real-time detection from the infected host plant tissues were conducted. The detection limit against E. amylovora was 102 CFU/mL, which had excellent sensitivity. The fluorogenic probe-based on-site diagnostic technology was supplemented by introducing a new portable UV device. This work holds enormous potential to be a new advanced tool for detecting fire blight in agricultural and livestock industries.
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Affiliation(s)
- Yuna Jung
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Ji Hye Jin
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Minji Jung
- Medical Science Research Institute, Kyung Hee University, Seoul 02447, Republic of Korea
| | - In Sun Hwang
- Department of Horticultural Biotechnology, College of Life Sciences, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Nguyen Trung Vu
- Graduate School of Green-Bio Science, Kyung Hee University, Yongin 17104, Republic of Korea
| | - Yoon Kyung Park
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Na Hee Kim
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Ki-Ho Park
- Division of Infectious Diseases, Department of Internal Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Chang-Sik Oh
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Dokyoung Kim
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
- Department of Anatomy and Neurobiology, College of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
- Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, Core Research Institute (CRI), Kyung Hee University, Seoul 02447, Republic of Korea
- Center for Converging Humanities, Kyung Hee University, Seoul 02447, Republic of Korea
- KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul 02447, Republic of Korea
- UC San Diego Materials Research Science and Engineering Center, 9500 Gilman Drive, La Jolla, CA 92093, USA
- Corresponding author
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Park YK, Jangili P, Zi S, Kang RH, Kim D, Kim JS. SIWV tetrapeptide and ROS-responsive prodrug conjugate for advanced glioblastoma therapy. Chem Commun (Camb) 2022; 58:10941-10944. [PMID: 36082694 DOI: 10.1039/d2cc03777g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new conjugate formulation, SIWV-PB-SN, based on glioblastoma (GBM)-homing SIWV tetrapeptide and an ROS-responsive prodrug is reported. SIWV-PB-SN selectively penetrates the GBM cells and releases anti-GBM drug (SN-38) via ROS-induced linker cleavage. This study presents a new insight for a more advanced therapeutic approach to overcoming GBM.
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Affiliation(s)
- Yoon Kyung Park
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea.
| | - Paramesh Jangili
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
| | - Soyu Zi
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
| | - Rae Hyung Kang
- Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, Kyung Hee University, Seoul 02447, Republic of Korea.
| | - Dokyoung Kim
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea. .,Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, Kyung Hee University, Seoul 02447, Republic of Korea. .,KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul 02447, Republic of Korea.,Department of Anatomy and Neurobiology, College of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea.,Center for Converging Humanities, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jong Seung Kim
- Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
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Jung Y, Jin JH, Kim Y, Oh JH, Moon H, Jeong H, Kim J, Park YK, Oh Y, Park S, Kim D. Development of a fluorescent nanoprobe based on an amphiphilic single-benzene-based fluorophore for lipid droplet detection and its practical applications. Org Biomol Chem 2022; 20:5423-5433. [PMID: 35758412 DOI: 10.1039/d2ob00830k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lipid droplets (LDs) are crucial biological organelles connected with metabolic pathways in biological systems and diseases. To monitor the locations and accumulation of LDs in lipid-related diseases, the development of a visualization tool for LDs has gained importance. In particular, LD visualization using fluorescent probes has gained attention. Herein, a new fluorescent nanoprobe, BMeS-Ali, is developed that can sense LDs based on an amphiphilic single benzene-based fluorophore (SBBF). BMeS-Ali consists of hydrophilic (-NH2) and hydrophobic (-C12H25) moieties and exists as a micelle nanostructure in aqueous media. BMeS-Ali has a weak fluorescence, but its emission was dramatically enhanced upon exposure to the LD components such as oleic acids (OA) by reassembling its nano-formulation. BMeS-Ali showed a selective LD staining ability and great biocompatibility in cells (cancer cells and stem cells). It also showed a practical sensing ability towards biologically derived lipids and can be applied to the visualization of human fingerprints. We found that the nanoprobe BMeS-Ali has significant potential to serve as a practical dye and sensor for lipids, especially for LD imaging in the biomedical research area and broader industrial applications.
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Affiliation(s)
- Yuna Jung
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea.
| | - Ji Hye Jin
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea.
| | - Youngseo Kim
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Ji Hyeon Oh
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea.
| | - Heechang Moon
- Department of Biomedical Science, Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul 04763, Korea
| | - Huisu Jeong
- Department of Biomedical Science, Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul 04763, Korea
| | - Jaehoon Kim
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea.
| | - Yoon Kyung Park
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea.
| | - Yohan Oh
- Department of Biomedical Science, Graduate School of Biomedical Science and Engineering, Hanyang University, Seoul 04763, Korea.,Department of Biochemistry and Molecular Biology, College of Medicine, Hanyang University, Seoul 04763, Korea
| | - Sungnam Park
- Department of Chemistry, Korea University, Seoul, 02841, Republic of Korea
| | - Dokyoung Kim
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea. .,Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, Kyung Hee University, Seoul 02447, Republic of Korea.,Department of Anatomy and Neurobiology, College of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea.,Center for Converging Humanities, Kyung Hee University, Seoul 02447, Republic of Korea.,KHU-KIST Department of Converging Science and Technology, Kyung Hee University, Seoul 02447, Republic of Korea
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Bae HJ, Park YK, Cho DY, Choi JH, Kim BS, Shin YS. Predictors of the Effects of Flow Diversion in Very Large and Giant Aneurysms. AJNR Am J Neuroradiol 2021; 42:1099-1103. [PMID: 33926897 PMCID: PMC8191680 DOI: 10.3174/ajnr.a7085] [Citation(s) in RCA: 4] [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: 08/18/2020] [Accepted: 12/24/2020] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE The treatment paradigm for very large and giant aneurysms has recently changed to flow diversion, in light of the results of the Pipeline for Uncoilable or Failed Aneurysms trial. However, the effects of flow diversion were definitely unknown. We explored this topic and identified the predictors of such effects. MATERIALS AND METHODS We retrospectively reviewed 51 patients with unruptured aneurysms admitted to our institution for flow diversion between February 2014 and August 2019. Patients were categorized into an effect group (no filling or remnant entry) and a no-effect group (subtotal or total filling). We evaluated the aneurysm size and shape, incorporation vessel, parent artery stenosis and curvature, stagnation of contrast medium within the aneurysm, use of balloon angioplasty, and intra-aneurysm thrombus as potential predictors of the effects of flow diversion. RESULTS The effect group comprised 34 patients (66.7%, 34/51; no filling, 35.3%, 18/51; and remnant entry, 31.4%, 16/51). The no-effect group comprised 17 patients (33.3%, 17/51; subtotal filling, 29.4%, 15/51; and total filling, 3.9%, 2/51). An incorporation vessel and balloon angioplasty were independent risk factors for the no-effect group in multivariate logistic regression analyses (OR = 0.13 and 0.05; 95% confidence intervals, 0.02-0.62 and 0.00-0.32; P values, .021 and .004, respectively). CONCLUSIONS Flow diversion is effective for very large and giant aneurysms, but the outcomes require further improvement. The results of this study show that an incorporated vessel and excessive balloon angioplasty might compromise flow diversion. This finding can help improve the outcomes of flow diversion.
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Affiliation(s)
- H J Bae
- From the Department of Neurosurgery (H.J.B.), Yeouido St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea
| | - Y K Park
- Department of Neurosurgery (Y.K.P.), Inje University Ilsan Paik Hospital, Goyang, Korea
| | - D Y Cho
- Department of Neurosurgery (D.Y.C.), Ewha Womans University, Seoul, Korea
| | - J H Choi
- Department of Neurosurgery (J.H.C., Y.S.S.), Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine. Seoul, Republic of Korea
| | - B S Kim
- Department of Radiology (B.S.K.), Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine, Seoul, Korea
| | - Y S Shin
- Department of Neurosurgery (J.H.C., Y.S.S.), Seoul St. Mary's Hospital, The Catholic University of Korea College of Medicine. Seoul, Republic of Korea
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6
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Son C, Park YK, Park JW. Long-term evaluation of temporomandibular disorders in association with cytokine and autoantibody status in young women. Cytokine 2021; 144:155551. [PMID: 33941445 DOI: 10.1016/j.cyto.2021.155551] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 11/16/2022]
Abstract
Temporomandibular disorders (TMD) is a chronic pain disease affecting 4-60% of general population. Its suggested etiology includes mechanical overloading to related structures, psychosocial factors, and genetic vulnerability. However, its pathogenesis is yet to be fully understood, especially in cases with a higher level of pain and more associated comorbidities. Recently chronic systemic inflammation and possible autoimmunity has been indicated in several pain conditions as the underlying mechanism of chronicity but this aspect has not been rigorously investigated in TMD. This article focuses on analyzing the levels of cytokines, chemokines, autoantibodies and nonspecific inflammatory markers and comparing their levels according to pain severity and duration in 66 female TMD patients in their 20 s and investigating their association with clinical indices of TMD and comorbidities. The high pain disability group showed decreased range of jaw function and more pain on palpation of capsule areas compared to the low pain disability group. Comorbidities such as anxiety and sleep disturbance were also significantly more prevalent. The level of IL-8 and IgG were significantly higher in the high pain disability group. IL-2, -8, -13, IFN- γ, RANTES, PGE2, and thrombopoietin levels showed a significant effect on indices reflecting jaw function, generalized pain intensity, and health related quality of life. Such results imply that longer pain duration and higher pain intensity is associated with higher levels of systemic inflammation suggesting the possible role of immunologic disturbance as an underlying factor of chronic TMD pain and warranting further investigation for its consideration in diagnosis and treatment.
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Affiliation(s)
- Chunghwan Son
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul 03080, Republic of Korea.
| | - Yoon Kyung Park
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul 03080, Republic of Korea.
| | - Ji Woon Park
- Department of Oral Medicine and Oral Diagnosis, School of Dentistry and Dental Research Institute, Seoul National University, 101 Yunkeun-Dong, Chongro-Ku, Seoul 03080, Republic of Korea.
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7
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Lee HH, Park YK, Duan X, Jia X, Jiang S, Yang M. Convolutional neural network based proton stopping-power-ratio estimation with dual-energy CT: a feasibility study. Phys Med Biol 2020; 65:215016. [PMID: 32736368 DOI: 10.1088/1361-6560/abab57] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Dual-energy computed tomography (DECT) has shown a great potential for lowering range uncertainties, which is necessary for truly leveraging the Bragg peak in proton therapy. However, analytical stopping-power-ratio (SPR) estimation methods have limitations in resolving the influence from the beam-hardening artifact, i.e. CT number variation of the same object scanned under different imaging conditions, such as different patient size and location in the field-of-view (FOV). We present a convolutional neural network (CNN)-based framework to estimate proton SPR that accounts for patient geometry variation and addresses CT number variation. The proposed framework was tested on both prostate and head-and-neck (HN) patient datasets. Simulated CT images were used in order to have a well-defined ground-truth SPR for evaluation. Two training scenarios were evaluated: training with patient CT images (ideal scenario) and training with computational phantoms (realistic scenario). For the training in ideal scenario, computational phantoms were created based on 120 kVp patient CT images using a custom-defined density and material translation curve. Then, 80 kVp and 150 kVp Sn DECT image pairs were obtained using ray-tracing simulation, and their corresponding SPR was calculated from the known density and elemental compositions. For the training in realistic scenario, computational phantoms were created based on the geometry of calibration phantoms. For both scenarios, evaluation was performed on the phantoms created from patient CT images. Compared to a conventional parametric model, U-net trained with computational phantoms (realistic scenario) reduced the SPR estimation uncertainty (95th percentile) of the prostate patient from 1.10% to 0.71%, and HN patient from 2.11% to 1.20%. With the U-net trained with patient images (ideal scenario) uncertainty values were 0.32% and 0.42% for prostate and HN patients, respectively. These results suggest that CNN has great potential to improve the accuracy of SPR estimation in proton therapy by incorporating individual patient geometry information.
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Affiliation(s)
- H Hc Lee
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX 75390, United States of America
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Cho DY, Kim BS, Choi JH, Park YK, Shin YS. The Fate of Unruptured Intracranial Vertebrobasilar Dissecting Aneurysm with Brain Stem Compression According to Different Treatment Modalities. AJNR Am J Neuroradiol 2019; 40:1924-1931. [PMID: 31601577 DOI: 10.3174/ajnr.a6252] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Accepted: 08/20/2019] [Indexed: 12/28/2022]
Abstract
BACKGROUND AND PURPOSE Unruptured intracranial vertebrobasilar dissecting aneurysms with brain stem compression are difficult to treat. In the present study, the clinical and radiologic outcomes of unruptured intracranial vertebrobasilar dissecting aneurysms with brain stem compression based on different treatment modalities were evaluated. MATERIALS AND METHODS This study included 28 patients with unruptured intracranial vertebrobasilar dissecting aneurysms with brain stem compression treated from January 2009 to December 2017. Treatment methods were observation (n = 6), stent-assisted coil embolization (n = 9), parent artery occlusion (n = 6), and flow diversion (n = 7). The data of baseline characteristics, change of aneurysm size, retreatment rate, stroke occurrence, and alteration of the mRS score were obtained from retrospective chart review. RESULTS The initial size of dissecting aneurysms was largest in the flow diversion group (22.5 ± 7.7 mm), followed by parent artery occlusion (20.3 ± 8.4 mm), stent-assisted coil embolization (11.7 ± 2.2 mm), and observation (17.8 ± 5.5 mm; P = .01) groups. The reduction rate of aneurysm size was highest in the parent artery occlusion group (26.7 ± 32.1%), followed by flow diversion (14.1% ± 28.7%), stent-assisted coil embolization (-17.9 ± 30.3%), and observation (-31.5 ± 30.8%; P = .007) groups. Additional treatment was needed in the observation (4/6, 66.7%) and stent-assisted coil embolization (3/9, 33.3%; P = .017) groups. Improvement of the mRS score on follow-up was observed in the flow diversion (6/7, 85.7%) and parent artery occlusion (4/6, 66.7%) groups but not in the stent-assisted coil embolization and observation groups. A worsened mRS score was most common in the observation group (4/6, 66.7%), followed by stent-assisted coil embolization (3/9, 33.3%), parent artery occlusion (2/6, 33.3%), and flow diversion (0/7, 0%) groups. CONCLUSIONS When treating intracranial vertebrobasilar dissecting aneurysms with brain stem compression, parent artery occlusion and flow diversion should be considered to reduce aneurysm size and improve the mRS score.
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Affiliation(s)
- D Y Cho
- From the Department of Neurosurgery (D.Y.C.), Ewha Womans University Seoul Hospital, College of Medicine, Ewha Womans University, Seoul, Republic of Korea
| | - B-S Kim
- Departments of Radiology (B.-S.K.)
| | - J H Choi
- Neurosurgery (J.H.C., Y.S.S.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
| | - Y K Park
- Department of Neurosurgery (Y.K.P.), Ilsan Paik Hospital, College of Medicine, Inje University, Goyang, Republic of Korea
| | - Y S Shin
- Neurosurgery (J.H.C., Y.S.S.), Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
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Kim KJ, Park JM, Lee JS, Kim YS, Kangwan N, Han YM, Kang EA, An JM, Park YK, Hahm KB. Oligonol prevented the relapse of dextran sulfate sodium-ulcerative colitis through enhancing NRF2-mediated antioxidative defense mechanism. J Physiol Pharmacol 2018; 69. [PMID: 30149369 DOI: 10.26402/jpp.2018.3.03] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 06/30/2018] [Indexed: 11/03/2022]
Abstract
Repeated bouts of ulcerative colitis featured troublesome course of inflammatory bowel disease leading to fatal colitis-associated cancer, which is strongly associated with oxidative stress and sustained inflammation. Since oligonol, low molecular weighted polyphenol extracted from fruit lychee, showed antioxidative and anti-inflammatory actions, we hypothesized that oligonolcan prevent relapse of colitis. We compared oligonol with current gold standard therapeutics, sulfasalazine in preventive efficacy of relapse. First, dextran sulfate sodium (DSS)-induced colitis were made following pretreatment with oligonol, 10, 50, and 100 mg/kg for 7 days to measure therapeutic effect of oligonol and relapse model via repeated DSS administration was made following with either 50 mg/kg oligonol or 30 mg/kg sulfasalazine to explore relapse preventing action of oligonol in C57BL/6 mice. Detailed changes in colon were measured to explain molecular mechanisms. Pretreatment of 10, 50, 100 mg/kg oligonol (p.o.), significantly reduced DSS-induced colitis; total pathologic scores, colon length, and clinical symptom scores (P < 0.05). Oligonol pretreatment significantly decreased the levels of interleukin (IL)-1, IL-6, and tumor necrosis factor-α (TNF-α) as well as nuclear factor-κB (NF-κB), c-Fos, and c-Jun in affected colon tissues, but the expression of heme oxygenase-1 (HO-1) and NADH: quinone oxidoreductase-1(NQO-1) as well as total antioxidant concentration (P < 0.005) was significantly increased with oligonol. A relapse model established with repeated DSS administration led to high mortality. However, oligonol significantly ameliorated exacerbations of colitis, while sulfasalazine did not (P < 0.01). Significantly decreased expressions of cyclooxygenase-2 (COX-2), TNF-α, and macrophages inhibition were relapse preventing actions of oligonal, but significant action of oligonol relevant to relapse prevention was either significantly increased expressions of NQO-1 or significantly preserved mucin (P < 0.05). Concerted anti-inflammatory, antioxidative, and host defense enhancing actions of oligonol can be applied during maintenance therapy of IBD to prevent relapse of IBD.
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Affiliation(s)
- K-J Kim
- Department of Gastroenterology, University of Ulsan Asan Medical Center, Seoul, Korea
| | - J-M Park
- Department of Pharmacology, Daejeon University School of Oriental Medicine, Daejeon, Korea
| | - J-S Lee
- Department of Biotechnology and Functional Food, Jeonju University, Cheonju, Korea
| | - Y S Kim
- Department of Biochemistry and Molecular Biology, Hanyang University School of Medicine, Seoul, Korea
| | | | - Y-M Han
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - E A Kang
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - J M An
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - Y K Park
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea
| | - K-B Hahm
- CHA Cancer Prevention Research Center, CHA Bio Complex, Seongnam, Korea. .,Digestive Disease Center, CHA University Bundang Medical Center, Seongnam, Korea
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10
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Noh BJ, Han CS, Park JS, Lee J, Kim YW, Park YK. ALK-positive anaplastic large-cell lymphoma with primary bone involvement: A rare case and review of the literature. Malays J Pathol 2018; 40:161-167. [PMID: 30173234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Primary bone lymphoma (PBL) is an uncommon type of extranodal lymphoma involvement. An anaplastic large-cell lymphoma (ALCL) is an extremely rare type of PBL, and it remains unclear whether ALCLs that primarily involve the bone exhibit favourable or unfavourable biological behaviour, and whether they are similar to ALCLs in general, or not. We reported a case of ALK-positive ALCL with primary bone involvement, and reviewed the clinicopathological features of 22 previously reported cases. An ALCL with primary bone involvement mostly affects younger patients with a preponderant towards the involvement of axial-bone. The prognosis of an ALCL that primarily involves bone is unfavourable, compared with PBL generally. The ALK-positive ALCLs in PBLs had less decedents than the ALK-negative ALCLs with a statistical non-significance (p=0.198).
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Affiliation(s)
- B J Noh
- University of Ulsan College of Medicine, Gangneung Asan Hospital, Department of Pathology, Gangneung, 25440, Korea.
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Song Y, Kim JS, Kim SH, Park YK, Yu E, Kim KH, Seo EJ, Oh HB, Lee HC, Kim KM, Seo HR. Patient-derived multicellular tumor spheroids towards optimized treatment for patients with hepatocellular carcinoma. J Exp Clin Cancer Res 2018; 37:109. [PMID: 29801504 PMCID: PMC5970513 DOI: 10.1186/s13046-018-0752-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 04/04/2018] [Indexed: 12/14/2022]
Abstract
Background Hepatocellular carcinoma (HCC) is one of the most common malignant tumors worldwide and has poor prognosis. Specially, patients with HCC usually have poor tolerance of systemic chemotherapy, because HCCs develop from chronically damaged tissue that contains considerable inflammation, fibrosis, and cirrhosis. Since HCC exhibits highly heterogeneous molecular characteristics, a proper in vitro system is required for the study of HCC pathogenesis. To this end, we have established two new hepatitis B virus (HBV) DNA-secreting HCC cell lines from infected patients. Methods Based on these two new HCC cell lines, we have developed chemosensitivity assays for patient-derived multicellular tumor spheroids (MCTSs) in order to select optimized anti-cancer drugs to provide more informative data for clinical drug application. To monitor the effect of the interaction of cancer cells and stromal cells in MCTS, we used a 3D co-culture model with patient-derived HCC cells and stromal cells from human hepatic stellate cells, human fibroblasts, and human umbilical vein endothelial cells to facilitate screening for optimized cancer therapy. Results To validate our system, we performed a comparison of chemosensitivity of the three culture systems, which are monolayer culture system, tumor spheroids, and MCTSs of patient-derived cells, to sorafenib, 5-fluorouracil, and cisplatin, as these compounds are typically standard therapy for advanced HCC in South Korea. Conclusion In summary, these findings suggest that the MCTS culture system is the best methodology for screening for optimized treatment for each patients with HCC, because tumor spheroids not only mirror the 3D cellular context of the tumors but also exhibit therapeutically relevant pathophysiological gradients and heterogeneity of in vivo tumors. Electronic supplementary material The online version of this article (10.1186/s13046-018-0752-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yeonhwa Song
- Cancer Biology Research Laboratory, Institut Pasteur Korea, 16, Daewangpangyo-ro 712 beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Korea
| | - Jin-Sun Kim
- Division of Gastroenterology and Hepatology, ASAN Medical center, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea
| | - Se-Hyuk Kim
- Cancer Biology Research Laboratory, Institut Pasteur Korea, 16, Daewangpangyo-ro 712 beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Korea
| | - Yoon Kyung Park
- Division of Gastroenterology and Hepatology, ASAN Medical center, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea
| | - Eunsil Yu
- Department of Pathology, University of Ulsan College of Medicine, Seoul, 05505, Korea
| | - Ki-Hun Kim
- Division of Hepatobiliary Surgery and Liver Transplantation, Department of Surgery, University of Ulsan College of Medicine, Seoul, 05505, Korea
| | - Eul-Ju Seo
- Department of Laboratory Medicine, Asan Medical, Center, University of Ulsan College of Medicine, Seoul, 05505, Korea
| | - Heung-Bum Oh
- Department of Laboratory Medicine, Asan Medical, Center, University of Ulsan College of Medicine, Seoul, 05505, Korea
| | - Han Chu Lee
- Division of Gastroenterology and Hepatology, ASAN Medical center, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea
| | - Kang Mo Kim
- Division of Gastroenterology and Hepatology, ASAN Medical center, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea.
| | - Haeng Ran Seo
- Cancer Biology Research Laboratory, Institut Pasteur Korea, 16, Daewangpangyo-ro 712 beon-gil, Bundang-gu, Seongnam-si, Gyeonggi-do, 13488, Korea.
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Yhi JY, Park DW, Min JH, Park YK, Kim SH, Kim TH, Sohn JW, Yoon HJ, Shin DH, Moon JY. Measurement of levels of fractional exhaled nitric oxide in patients with pulmonary tuberculosis. Int J Tuberc Lung Dis 2018; 20:1174-80. [PMID: 27510242 DOI: 10.5588/ijtld.15.1019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING The role of fractional exhaled nitric oxide (FeNO) in the diagnosis and treatment of pulmonary tuberculosis (PTB) is uncertain. OBJECTIVE To examine the value of FeNO as a biomarker for PTB. DESIGN Baseline FeNO levels were compared in 69 PTB patients and 118 healthy controls. The correlation between baseline FeNO levels and clinical variables of tuberculosis were studied. FeNO levels were checked twice in the PTB group, at diagnosis and after 2 months of anti-tuberculosis medication, and factors affecting changes in FeNO levels after treatment were analysed. RESULTS FeNO levels were not significantly different in the PTB group and controls (mean ± standard deviation 27.7 ± 17.6 parts per billion [ppb] vs. 27.0 ± 10.8 ppb, P = 0.531). In a multivariate regression analysis, no variable was shown to affect FeNO levels at diagnosis. FeNO levels did not significantly change after 2 months of treatment (26.8 ± 18.3 ppb vs. 24.0 ± 10.7 ppb, P = 0.257). Only PTB with a high FeNO level (>25 ppb) was related to a decline in FeNO levels after 2 months of treatment. CONCLUSION FeNO levels do not appear to be affected in PTB patients.
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Affiliation(s)
- J Y Yhi
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - D W Park
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - J-H Min
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - Y K Park
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - S-H Kim
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - T-H Kim
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - J W Sohn
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - H J Yoon
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - D H Shin
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
| | - J-Y Moon
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea
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Abstract
OBJECTIVES We evaluated the accuracy of augmented reality (AR)-based navigation assistance through simulation of bone tumours in a pig femur model. METHODS We developed an AR-based navigation system for bone tumour resection, which could be used on a tablet PC. To simulate a bone tumour in the pig femur, a cortical window was made in the diaphysis and bone cement was inserted. A total of 133 pig femurs were used and tumour resection was simulated with AR-assisted resection (164 resection in 82 femurs, half by an orthropaedic oncology expert and half by an orthopaedic resident) and resection with the conventional method (82 resection in 41 femurs). In the conventional group, resection was performed after measuring the distance from the edge of the condyle to the expected resection margin with a ruler as per routine clinical practice. RESULTS The mean error of 164 resections in 82 femurs in the AR group was 1.71 mm (0 to 6). The mean error of 82 resections in 41 femurs in the conventional resection group was 2.64 mm (0 to 11) (p < 0.05, one-way analysis of variance). The probabilities of a surgeon obtaining a 10 mm surgical margin with a 3 mm tolerance were 90.2% in AR-assisted resections, and 70.7% in conventional resections. CONCLUSION We demonstrated that the accuracy of tumour resection was satisfactory with the help of the AR navigation system, with the tumour shown as a virtual template. In addition, this concept made the navigation system simple and available without additional cost or time.Cite this article: H. S. Cho, Y. K. Park, S. Gupta, C. Yoon, I. Han, H-S. Kim, H. Choi, J. Hong. Augmented reality in bone tumour resection: An experimental study. Bone Joint Res 2017;6:137-143.
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Affiliation(s)
- H S Cho
- Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - Y K Park
- Department of Orthopaedic Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - S Gupta
- Division of Orthopaedic Surgery, Glasgow Royal Infirmary, 84 Castle Street, Glasgow, G4 0SF, UK
| | - C Yoon
- Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - I Han
- Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - H-S Kim
- Department of Orthopaedic Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - H Choi
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea
| | - J Hong
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea
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Kim SC, Jung HY, Nah JW, Park YK. Complete Oxidation of Toluene Over Supported Palladium Catalysts: Effect of Support. J Nanosci Nanotechnol 2016; 16:4638-4642. [PMID: 27483803 DOI: 10.1166/jnn.2016.11020] [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: 06/06/2023]
Abstract
The catalytic oxidation of toluene was carried out to investigate the effect of the support on the properties and performance of a supported palladium catalyst (1 wt% loading). γ-Al2O3), SiO2 and TiO2 were used as supports. The properties of the prepared catalysts were characterized by XRD, BET, PT, TPD, TPR, XPS and FE-TEM analyses. The experimental results showed that the order of catalytic performance was 1 wt% Pd/TiO2 > 1 wt% Pd/SiO2 > 1 wt% Pd/γ-Al2O3. A strong interaction between the palladium and support was found, which affected the palladium surface concentration and particle size. The higher catalytic activity of the Pd/TiO2 catalyst was attributed to the higher palladium surface concentration and larger particle size.
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Park E, Kim J, Yim JH, Han J, Kwon TS, Park YK, Jeon JK. Synthesis of Dicyclopentadiene Oligomer Over Nanoporous Al-MCM-41 Catalysts. J Nanosci Nanotechnol 2016; 16:4512-4515. [PMID: 27483783 DOI: 10.1166/jnn.2016.11005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
One step reaction composed of DCPD oligomerization and DCPD oligomer isomerization was investigated over nanoporous Al-MCM-41 catalysts. The effects of aluminum grafting over MCM-41 on the catalyst characteristics were studied with respect to the synthesis of TCPD isomer. Physical and chemical properties of the catalysts were analyzed by N2 adsorption, temperature-programmed desorption of ammonia, and infrared spectroscopy of adsorbed pyridine. The overall number of acid sites as well as the number of Lewis acid sites increased with increasing of aluminum content over MCM-41. When utilizing MCM-41 and Al-MCM-41 as the catalyst, DCPD oligomerization reaction activity greatly increased compared to the thermal reaction. The highest TCPD isomer selectivity over the Al-MCM-41 catalyst with the highest aluminum content could be ascribed to the largest amount of acid sites. This study showed an increased level of TCPD isomer selectivity by an increasing level of Lewis acid sites through aluminum addition over MCM-41.
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Park YK, Yoo ML, Park SH. Catalytic Fast Pyrolysis of Wild Reed Over Nanoporous SBA-15 Catalysts. J Nanosci Nanotechnol 2016; 16:4561-4564. [PMID: 27483790 DOI: 10.1166/jnn.2016.10979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Wild reed was pyrolyzed over two nanoporous SBA-15 catalysts with different acid characteristics: Si-SBA-15 and Al-SBA-15. Al was grafted on Si-SBA-15 to increase the acidity and enhance the catalytic activity. Fast pyrolysis was carried out using a pyrolysis-gas chromatography/mass spectrometry system at 550 degrees C for real-time analysis of the products. Significant improvement of the product bio-oil quality was attained by catalytic reforming over nanoporous Al-SBA-15. The fraction of total oxygenates was reduced because of the decrease in. the fraction of ketones, aldehydes, and carboxylates, which deteriorate the fuel quality of bio-oil. On the other hand, the fractions of furans and aromatics, which are the chemicals with high value-added, were increased by the catalytic reforming. The catalytic activity of Al-SBA-15 was considerably higher than that of Si-SBA-15 because the incorporation of Al increased the catalyst acidity.
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Lee H, Park YK, Kim SJ, Kim BJ, An KH, Kim BH, Jung SC. Facile Synthesis of Iron Oxide/Graphene Nanocomposites Using Liquid Phase Plasma Method. J Nanosci Nanotechnol 2016; 16:4483-4486. [PMID: 27483778 DOI: 10.1166/jnn.2016.10995] [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: 06/06/2023]
Abstract
Liquid phase plasma (LPP) method was applied, for the first time, to the impregnation of iron oxide nanoparticles onto graphene sheet. Iron oxide nanoparticles with the size of 50 nm were precipitated with uniform dispersion on the surface of graphene sheet. The amount of iron oxide nanoparticles precipitated on graphene sheets increased with increasing LPP process times. The XPS, Raman and EDX analyses showed that the iron oxide/graphene composites synthesized by the LPP process.
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Choi JS, Lee H, Park YK, Kim SJ, Kim BJ, An KH, Kim BH, Jung SC. Application of Silver and Silver Oxide Nanoparticles Impregnated on Activated Carbon to the Degradation of Bromate. J Nanosci Nanotechnol 2016; 16:4493-4497. [PMID: 27483780 DOI: 10.1166/jnn.2016.10986] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Silver and silver oxide nanoparticles were impregnated on the surface of powdered activated carbon (PAC) using a single-step liquid phase plasma (LPP) method. Spherical silver and silver oxide nanoparticles of 20 to 100 nm size were dipersed evenly on the surface of PAC. The impregnated PAC exhibited a higher activity for the decomposition of bromate than bare PAC. The XPS, Raman and EDX analyses showed that the Ag/PAC composites synthesized by the LPP process.
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Park YK, Kang HK, Jang H, Suh DJ, Park SH. Catalytic Reforming of Lignin-Derived Bio-Oil Over a Nanoporous Molecular Sieve Silicoaluminophosphate-11. J Nanosci Nanotechnol 2016; 16:4434-4437. [PMID: 27483769 DOI: 10.1166/jnn.2016.11014] [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: 06/06/2023]
Abstract
Catalytic pyrolysis of lignin, a major constituent of biomass, was performed. A nanoporous molecular sieve silicoaluminophosphate-11 (SAPO-11) was selected as catalyst. Thermogravimetric analysis showed that 500 degrees C was the optimal pyrolysis temperature. Pyrolyzer-gas chromatography/mass spectroscopy was used to investigate the pyrolysis product distribution. Production of phenolics, the dominant product from the pyrolysis of lignin, was promoted by the increase in the catalyst dose. In particular, low-molecular-mass phenolics were produced more over SAPO-11, while high-molecular-mass phenolics and double-bond-containing phenolics were produced less. The fraction of aromatic compounds, including benzene, toluene, xylene, and ethylbenzene, was also increased by catalytic reforming. The catalytic effects were more pronounced when the catalyst/biomass ratio was increased. The enhanced production of aromatic compounds by an acidic catalyst obtained in this study is in good agreement with the results of previous studies.
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Hoesl M, Deepak S, Moteabbed M, Jassens G, Orban J, Park YK, Parodi K, Bentefour EH, Lu HM. Clinical commissioning of an in vivo range verification system for prostate cancer treatment with anterior and anterior oblique proton beams. Phys Med Biol 2016; 61:3049-62. [PMID: 27002470 DOI: 10.1088/0031-9155/61/8/3049] [Citation(s) in RCA: 17] [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: 12/25/2022]
Abstract
The purpose of this work is the clinical commissioning of a recently developed in vivo range verification system (IRVS) for treatment of prostate cancer by anterior and anterior oblique proton beams. The IRVS is designed to perform a complete workflow for pre-treatment range verification and adjustment. It contains specifically designed dosimetry and electronic hardware and a specific software for workflow control with database connection to the treatment and imaging systems. An essential part of the IRVS system is an array of Si-diode detectors, designed to be mounted to the endorectal water balloon routinely used for prostate immobilization. The diodes can measure dose rate as function of time from which the water equivalent path length (WEPL) and the dose received are extracted. The former is used for pre-treatment beam range verification and correction, if necessary, while the latter is to monitor the dose delivered to patient rectum during the treatment and serves as an additional verification. The entire IRVS workflow was tested for anterior and 30 degree inclined proton beam in both solid water and anthropomorphic pelvic phantoms, with the measured WEPL and rectal doses compared to the treatment plan. Gafchromic films were also used for measurement of the rectal dose and compared to IRVS results. The WEPL measurement accuracy was in the order of 1 mm and after beam range correction, the dose received by the rectal wall were 1.6% and 0.4% from treatment planning, respectively, for the anterior and anterior oblique field. We believe the implementation of IRVS would make the treatment of prostate with anterior proton beams more accurate and reliable.
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Affiliation(s)
- M Hoesl
- Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA. Faculty of Physics, Ludwig Maximilians University Munich, Munich, Germany
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Lee JH, Nam BH, Ryu KW, Ryu SY, Park YK, Kim S, Kim YW. Comparison of outcomes after laparoscopy-assisted and open total gastrectomy for early gastric cancer. Br J Surg 2015; 102:1500-5. [PMID: 26398912 DOI: 10.1002/bjs.9902] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 12/16/2014] [Accepted: 06/19/2015] [Indexed: 12/24/2022]
Abstract
BACKGROUND The aim of this study was to compare the results of laparoscopy-assisted total gastrectomy with those of open total gastrectomy for early gastric cancer. METHODS Patients with gastric cancer who underwent total gastrectomy with curative intent in three Korean tertiary hospitals between January 2003 and December 2010 were included in this multicentre, retrospective, propensity score-matched cohort study. Cox proportional hazards regression models were used to evaluate the association between operation method and survival. RESULTS A total of 753 patients with early gastric cancer were included in the study. There were no significant differences in the matched cohort for overall survival (hazard ratio (HR) for laparoscopy-assisted versus open total gastrectomy 0.96, 95 per cent c.i. 0.57 to 1.65) or recurrence-free survival (HR 2.20, 0.51 to 9.52). The patterns of recurrence were no different between the two groups. The severity of complications, according to the Clavien-Dindo classification, was similar in both groups. The most common complications were anastomosis-related in the laparoscopy-assisted group (8.0 per cent versus 4.2 per cent in the open group; P = 0.015) and wound-related in the open group (1.6 versus 5.6 per cent respectively; P = 0.003). Postoperative death was more common in the laparoscopy-assisted group (1.6 versus 0.2 per cent; P = 0.045). CONCLUSION Laparoscopy-assisted total gastrectomy for early gastric cancer is feasible in terms of long-term results, including survival and recurrence. However, a higher postoperative mortality rate and an increased risk of anastomotic leakage after laparoscopic-assisted total gastrectomy are of concern.
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Affiliation(s)
- J H Lee
- Department of Surgery, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - B-H Nam
- Department of Cancer Control and Policy, Graduate School of Cancer Science and Policy, Seoul, Korea
| | - K W Ryu
- Centre for Gastric Cancer, National Cancer Centre, Goyang-si, Gyeonggi-do, Seoul, Korea
| | - S Y Ryu
- Department of Surgery, Chunnam National University Whasoon Hospital, Seoul, Korea
| | - Y K Park
- Department of Surgery, Chunnam National University Whasoon Hospital, Seoul, Korea
| | - S Kim
- Department of Surgery, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Y W Kim
- Department of Cancer Control and Policy, Graduate School of Cancer Science and Policy, Seoul, Korea
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Park YK, Lee JY, Ko KS. Transcriptomic analysis of colistin-susceptible and colistin-resistant isolates identifies genes associated with colistin resistance in Acinetobacter baumannii. Clin Microbiol Infect 2015; 21:765.e1-7. [PMID: 25911992 DOI: 10.1016/j.cmi.2015.04.009] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [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: 11/21/2014] [Revised: 04/10/2015] [Accepted: 04/10/2015] [Indexed: 12/26/2022]
Abstract
The emergence of colistin-resistant Acinetobacter baumannii is concerning, as colistin is often regarded as the last option for treating multidrug-resistant (MDR) A. baumannii infections. Using mRNA sequencing, we compared whole transcriptomes of colistin-susceptible and colistin-resistant A. baumannii strains, with the aim of identifying genes involved in colistin resistance. A clinical colistin-susceptible strain (06AC-179) and a colistin-resistant strain (07AC-052) were analysed in this study. In addition, a colistin-resistant mutant (06AC-179-R1) derived from 06AC-179 was also included in this study. High throughput mRNA sequencing was performed with an Illumina HiSeq TM 2000. In total, six genes were identified as associated with colistin resistance in A. baumannii. These six genes encode PmrAB two-component regulatory enzymes, PmrC (a lipid A phosphoethanolamine transferase), a glycosyltransferase, a poly-β-1,6-N-acetylglucosamine deacetylase, and a putative membrane protein. Matrix-assisted laser desorption/ionization time of flight mass spectrometry revealed that all three colistin-resistant strains used in this study had modified lipid A structure by addition of phosphoethanolamine. As genes found in our results are all associated with either lipopolysaccharide biosynthesis or electrostatic changes in the bacterial cell membrane, lipopolysaccharide modification might be one of the principal modes of acquisition of colistin resistance in some A. baumannii strains.
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Affiliation(s)
- Y K Park
- Department of Molecular Cell Biology, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - J-Y Lee
- Department of Molecular Cell Biology, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea
| | - K S Ko
- Department of Molecular Cell Biology, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon, Korea.
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Lee DH, Park YK. Isolated fallopian tube torsion during pregnancy: a case report. CLIN EXP OBSTET GYN 2015; 42:681-682. [PMID: 26524824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Isolated fallopian tube torsion is a rare pregnancy-related complication. It is frequently misdiagnosed as acute appendicitis or ovarian torsion owing to the lack of specific symptoms or signs. Here, the authors report a case of a 35-year-old primigravida at 30 weeks and six days of gestation who had presented with right isolated fallopian tube torsion and a history of right oophorectomy. The authors propose that isolated fallopian tube torsion should be included in the list of differential diagnosis when encountered with patients complaining of lower abdominal pain.
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Abstract
During the maintenance of bone marrow-derived mesenchymal stem cells (BMMSCs), suspended cells are discarded normally. We noted the osteogenic potential of these cells to be like that of anchorage-dependent BMMSCs. Therefore, we characterized suspended BMMSCs from rabbit bone marrow by bioengineering and applied the suspended BMMSCs to double-canaled dental implants inserted into rabbits. After primary isolation of BMMSCs, we collected the suspended cells during primary culture on the third day. The cells were transferred and maintained on an extracellular-matrix-coated culture plate. The cells were characterized and compared with BMMSCs by colony-forming-unit fibroblast (CFU-f) and cell proliferation assay, fluorescence-activated cell sorter (FACS), in vitro multipotency, and reverse transcription polymerase chain reaction (RT-PCR). We also analyzed the osteogenic potential of cells mixed with hydroxyapatite/tricalcium phosphate (HA/TCP) and transplanted into immunocompromised mice. We compared the viability and proliferation of the suspended BMMSCs and BMMSCs on the titanium implant surface and observed cell morphology. Then, the cells mixed with HA/TCP were applied to the double-canaled implants during installation into rabbit tibia. Four weeks later, we analyzed bone formation inside the canal by histomorphometry. The suspended cells showed higher CFU-f on the extracellular matrix (ECM)-coated culture plate and similar results of proliferation capacity compared with BMMSCs. The cells also showed osteogenic, adipogenic, and chondrogenic ability. The suspended cells showed levels of attachment survival and proliferation on the surfaces of titanium implant discs to be higher than or similar to those of BMMSCs. The suspended cells as well as BMMSCs showed stronger bone formation ability in both upper and lower canals of the implants compared with controls on double-canaled implants inserted into rabbit tibia. In this study, we showed that suspended cells after primary BMMSC isolation have bone regeneration capacity like that of BMMSCs, not only in vitro but also in vivo. ECM was valuable for propagation of MSCs for cell-based bone regeneration. Therefore, the suspended cells could also be useful tools for bone regeneration after implant surgery.
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Affiliation(s)
- R C Zheng
- Department of Prosthodontics & Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea
| | - Y K Park
- Department of Dental Research Institute, Brain Korea 21, Seoul National University, Seoul, South Korea
| | - J J Cho
- Department of Dental Regenerative Biotechnology, School of Dentistry, Seoul, South Korea
| | - S K Kim
- Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, South Korea
| | - S J Heo
- Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, South Korea
| | - J Y Koak
- Department of Prosthodontics & Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, Seoul National University, Seoul, South Korea
| | - J H Lee
- Department of Prosthodontics, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, South Korea
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Lee JH, Nam BH, Ryu KW, Ryu SY, Kim YW, Kim S, Park YK. Tumor differentiation is not a risk factor for lymph node metastasis in elderly patients with early gastric cancer. Eur J Surg Oncol 2014; 40:1771-6. [PMID: 25245539 DOI: 10.1016/j.ejso.2014.07.042] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [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: 04/30/2014] [Revised: 07/16/2014] [Accepted: 07/29/2014] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND The aim of this study was to identify risk factors for lymph node metastasis in elderly patients (70 years or more) with early gastric cancer. METHODS We reviewed the prospectively collected database of 6893 patients with early gastric cancer who had undergone curative gastrectomy in 3 tertiary cancer centers between January 2003 and December 2009 in Korea. Patients were sorted into 4 groups according to age: less than 50, fifties, sixties, and 70 years or more. Risk factors for lymph node metastasis in early gastric cancer were analyzed. RESULTS One thousand and thirty five patients (15.0%) were 70 years or more. As age increased, the frequency of large differentiated tumor, lymphatic and submucosa invasion increased. Old age was associated with a lower risk for lymph node metastasis in patients with early gastric cancer (Odds ratio [OR], OR, 0.622; 95% CI, 0.5466-0.830, P = 0.010). Ulceration or differentiation of tumor was not associated with lymph node metastasis in elderly patients with early gastric cancer. CONCLUSIONS Elderly patients with undifferentiated type histology early gastric cancer without other risk factors for lymph node metastasis may be candidates for endoscopic resection.
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Affiliation(s)
- J H Lee
- Department of Surgery, Sungkyunkwan University School of Medicine, South Korea
| | - B-H Nam
- Center for Clinical Trial, National Cancer Center, South Korea
| | - K W Ryu
- Center for Gastric Cancer, National Cancer Center, South Korea
| | - S Y Ryu
- Department of Surgery, Chonnam National University Hwasoon Hospital, South Korea
| | - Y W Kim
- Center for Gastric Cancer, National Cancer Center, South Korea
| | - S Kim
- Department of Surgery, Sungkyunkwan University School of Medicine, South Korea
| | - Y K Park
- Department of Surgery, Chonnam National University Hwasoon Hospital, South Korea.
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Yoon CH, Park YK, Kim SJ, Lee MJ, Ryoo S, Kim GM, Chung CS, Lee KH, Kim JS, Bang OY. Eligibility and preference of new oral anticoagulants in patients with atrial fibrillation: comparison between patients with versus without stroke. Stroke 2014; 45:2983-8. [PMID: 25147329 DOI: 10.1161/strokeaha.114.005599] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
BACKGROUND AND PURPOSE Recent randomized clinical trials (RCTs) have evaluated the benefit of new oral anticoagulants in reducing the risk of vascular events and bleeding complications in patients with atrial fibrillation (AF). However, abundant and strict enrollment criteria may limit the validity and applicability of results of RCTs to clinical practice. We estimated the eligibility for participation in RCTs of an unselected group of patients with AF. In addition, we compared features favoring new oral anticoagulant use between patients with versus without stroke. Randomized Evaluation of Long-Term Anticoagulation Therapy METHODS We applied enrollment criteria of 4 RCTs (RE-LY, ROCKET-AF, ARISTOTLE, and ENGAGE-AF-TIMI 48) to 695 patients with AF taking warfarin, prospectively and consecutively collected at a university medical center; 500 patients with and 195 patients without stroke. Time in therapeutic range and bleeding risk scheme (anticoagulation and risk factors in atrial fibrillation) were also measured. RESULTS The proportions of patients fulfilling the trial enrollment criteria varied, ranging from 39% to 72.8%, depending on the differences in indications/contraindications among studies and presence/absence of stroke. The main reasons for ineligibility for RCTs were hemorrhagic risk (anticoagulation and risk factors in atrial fibrillation [ATRIA] score) (10.8%-40.5%) and planned cardioversion (5.1%-7.7%) for nonstroke patients, and a low creatinine clearance (5.6%-9.2%) and higher risk of bleeding (15.2%-20.8%) for patients with stroke. When compared with nonstroke patients, patients with stroke showed a lower time in therapeutic range (54.4±42.8% versus 65.4±34.9%, especially with severe disability) and a high hemorrhagic risk (ATRIA score) (3.06±2.30 versus 2.18±2.16) (P<0.05 in both cases). CONCLUSIONS Patients enrolled in RCTs are partly representative of patients with AF in clinical practice. When time in therapeutic range and bleeding tendency with warfarin use were considered, the use of new oral anticoagulants was preferred in patients with stroke than in nonstroke patients, but they were more likely to be excluded in RCTs.
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Affiliation(s)
- Chang Hyo Yoon
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Yoon Kyung Park
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Suk Jae Kim
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Mi-ji Lee
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Sookyung Ryoo
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Gyeong-Moon Kim
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Chin-Sang Chung
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Kwang Ho Lee
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - June Soo Kim
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Oh Young Bang
- From the Department of Neurology (C.H.Y., Y.K.P., S.J.K., M.-j.L., S.R., G.-M.K., C.-S.C., K.H.L., O.Y.B.) and Department of Cardiology (J.S.K.), Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea.
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Yoon CH, Park YK, Kim SJ, Lee M, Ryoo S, Kim GM, Chung CS, Lee KH, Bang OY. Abstract T P335: Eligibility and Preference of New Oral Anticoagulants in Patients With Atrial Fibrillation: Comparison Between Patients With Versus Without Stroke or TIA. Stroke 2014. [DOI: 10.1161/str.45.suppl_1.tp335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUNDS:
Recent randomized clinical trials of new oral anticoagulants (NOACs) forms the basis for international guidelines for the management of patients with atrial fibrillation. However, strict enrollment criteria may limit the applicability of results of trials to clinical practice. We estimated the eligibility for participation in landmark trials of NOACs of an unselected group of atrial fibrillation patients with or without stroke/TIA. In addition, we compared the preference for NOACs use between patients with versus without stroke/TIA.
METHODS:
Four hundred patients were prospectively and consecutively enrolled in a database from a university medical center. We applied three large NOAC trials' enrollment criteria (RE-LY, ROCKET-AF, and ARISTOTLE). In addition, INR lability (time in therapeutic window for patients taking warfarin) and bleeding risk schemes (ATRIA) were measured.
RESULTS:
The proportions of patients fulfilling the trial enrollment criteria ranged from 20% to 75%, depending on the differences in the indications/contraindications of studies (lower in ROCKET-AF than others) and presence or absence of stroke/TIA (20-60% vs. 75%). The main reasons for ineligible for NOACs are lower CHADS2 score and planned cardioversion for patients without stroke/TIA, whereas low creatinine clearance and bleeding-related complications for those with stroke/TIA. TTR is lower in the former, especially in patients with severe disability. In addition, bleeding tendency as measured by ATRIA is much higher in patients with stroke/TIA, mainly due to concomitant use of antithrombotics.
CONCLUSIONS:
Our data confirm that patients enrolled in randomized clinical trials are representative of most stroke patients with atrial fibrillation, but partly of nonstroke patients, in clinical practice. When INR lability and bleeding tendency with warfarin use were considered, the use of NOACs was preferred in patients with stroke/TIA than in patients without
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Affiliation(s)
- Chang Hyo Yoon
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Yoon Kyung Park
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Suk Jae Kim
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Miji Lee
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Sookyung Ryoo
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Gyeong-Moon Kim
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Chin-Sang Chung
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Kwang Ho Lee
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
| | - Oh Young Bang
- Neurology, Dept of Neurology, Samsung Med Cntr, Sungkyunkwan Univ Sch of Medicine, Seoul, Korea, Republic of
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Kim CK, Joo YT, Lee EP, Park YK, Kim HJ, Kim SJ. Simple, direct drug susceptibility testing technique for diagnosis of drug-resistant tuberculosis in resource-poor settings. Int J Tuberc Lung Dis 2013; 17:1212-6. [PMID: 23823178 DOI: 10.5588/ijtld.12.1009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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
SETTING The Korean Institute of Tuberculosis, Seoul, Republic of Korea. OBJECTIVE To develop a simple, direct drug susceptibility testing (DST) technique using Kudoh-modified Ogawa (KMO) medium. DESIGN The critical concentrations of isoniazid (INH), rifampicin (RMP), kanamycin (KM) and ofloxacin (OFX) for KMO medium were calibrated by comparing the minimal inhibitory concentrations (MICs) against clinical isolates of Mycobacterium tuberculosis on KMO with those on Löwenstein-Jensen (LJ). The performance of the direct KMO DST technique was evaluated on 186 smear-positive sputum specimens and compared with indirect LJ DST. RESULTS Agreement of MICs on direct vs. indirect DST was high for INH, RMP and OFX. KM MICs on KMO were ∼10 g/ml higher than those on LJ. The critical concentrations of INH, RMP, OFX and KM for KMO were therefore set at 0.2, 40.0, 2.0, and 40.0 g/ml. The evaluation of direct DST of smear-positive sputum specimens showed 100% agreement with indirect LJ DST for INH and RMP. However, the respective susceptible and resistant predictive values were 98.8% and 100% for OFX, and 100% and 80% for KM. CONCLUSION Direct DST using KMO is useful, with clear advantages of a shorter turnaround time, procedural simplicity and low cost compared to indirect DST. It may be most indicated in resource-poor settings for programmatic management of drug-resistant tuberculosis.
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Affiliation(s)
- C-K Kim
- Korean National Tuberculosis Association, Korean Institute of Tuberculosis, Republic of Korea.
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Yoon JH, Ingale SL, Kim JS, Kim KH, Lohakare J, Park YK, Park JC, Kwon IK, Chae BJ. Effects of dietary supplementation with antimicrobial peptide-P5 on growth performance, apparent total tract digestibility, faecal and intestinal microflora and intestinal morphology of weanling pigs. J Sci Food Agric 2013; 93:587-592. [PMID: 22903784 DOI: 10.1002/jsfa.5840] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 06/29/2012] [Accepted: 07/05/2012] [Indexed: 06/01/2023]
Abstract
BACKGROUND The increase in drug-resistant bacteria and the ban on antibiotic growth promoters worldwide make the search for novel means of preventing bacterial infection and promoting growth performance imperative. In this sense, antimicrobial peptides are thought to be ideal candidates owing to their antimicrobial properties, broad spectrum of activity and low propensity for development of bacterial resistance. The aim of the present study was to investigate the effect of dietary supplementation with antimicrobial peptide-P5 (AMP-P5) on weanling pig nutrition. RESULTS A total of 240 weanling pigs were allotted to four treatments on the basis of initial body weight. There were four replicates in each treatment, with 15 pigs per replicate. Dietary treatments were negative control (NC, basal diet without antimicrobial), positive control (PC, basal diet + 1.5 g kg(-1) apramycin), basal diet with 40 mg kg(-1) AMP-P5 (P5-40) and basal diet with 60 mg kg(-1) AMP-P5 (P5-60). Pigs fed the PC or P5-60 diet showed improved (P < 0.05) overall growth performance, apparent total tract digestibility of dry matter, crude protein and gross energy and reduced (P < 0.05) faecal and intestinal coliforms compared with pigs fed the NC diet. CONCLUSION The results obtained in this study indicate that dietary supplementation with 60 mg kg(-1) AMP-P5 has the potential to improve the growth performance and apparent total tract digestibility of nutrients and reduce coliforms in weanling pigs.
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Affiliation(s)
- Jung Ho Yoon
- College of Animal Life Sciences, Kangwon National University, Chuncheon, South Korea
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Heo NY, Lee HC, Park YK, Park JW, Lim YS, Kim KM, Shim JH, Lee YJ. Lack of association between hepatitis B virus pre-S mutations and recurrence after surgical resection in hepatocellular carcinoma. J Med Virol 2013; 85:589-96. [PMID: 23296476 DOI: 10.1002/jmv.23502] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/22/2012] [Indexed: 01/05/2023]
Abstract
Pre-S mutation of hepatitis B virus (HBV) is known to be a risk factor for hepatocarcinogenesis. A previous study suggested that pre-S mutation(s) may associate with increased recurrence after surgical resection. In the present study, 64 patients with HBV-related hepatocellular carcinoma (HCC) were categorized into two groups according to the presence or absence of pre-S mutation(s). The clinicopathological variables of the two groups were analyzed to assess the relationship between pre-S mutations and postoperative recurrence. Nineteen patients (29.7%) had pre-S mutations;13 had a pre-S deletion, three had a pre-S2 start codon mutation, two patients had both a pre-S deletion, and a pre-S2 start codon mutation, and one patient had a pre-S2 insertion. The two groups did not differ in terms of baseline clinicopathological parameters. Cirrhosis and satellite lesion(s) were predictive factors for postoperative recurrence and poor overall survival. Recurrence-free survival (P = 0.320) and overall survival (P = 0.238) did not differ significantly when pre-S mutations were present. In conclusion, this study did not find evidence supporting the notion that pre-S mutation(s) are associated with postoperative recurrence after surgical resection.
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Affiliation(s)
- Nae-Yun Heo
- Department of Internal Medicine, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Korea
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Yoon DH, Kwon OY, Mang JY, Jung MJ, Kim DY, Park YK, Heo TH, Kim SJ. Protective potential of resveratrol against oxidative stress and apoptosis in Batten disease lymphoblast cells. Biochem Biophys Res Commun 2011; 414:49-52. [DOI: 10.1016/j.bbrc.2011.09.019] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 09/03/2011] [Indexed: 11/27/2022]
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32
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Park YK, Kim KM, Lee YJ, Kim KH, Lee SG, Lee D, Shim JH, Lim YS, Lee HC, Chung YH, Lee YS, Suh DJ. Could HBx protein expression affect signal pathway inhibition by gefitinib or selumetinib, a MEK inhibitor, in hepatocellular carcinoma cell lines? J Korean Med Sci 2011; 26:214-21. [PMID: 21286012 PMCID: PMC3031005 DOI: 10.3346/jkms.2011.26.2.214] [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] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/19/2010] [Accepted: 11/02/2010] [Indexed: 11/20/2022] Open
Abstract
Hepatitis B virus X (HBx) protein has been known to play an important role in development of hepatocellular carcinoma (HCC). The aim of this study is to find out whether HBx protein expression affects antiproliferative effect of an epidermal growth factor receptor-tyrosine kinase (EGFR-TK) inhibitor and a MEK inhibitor in HepG2 and Huh-7 cell lines. We established HepG2 and Huh-7 cells transfected stably with HBx gene. HBx protein expression increased pERK and pAkt expression as well as β-catenin activity in both cells. Gefitinib (EGFR-TK inhibitor) inhibited pERK and pAkt expression and β-catenin activity in both cells. Selumetinib (MEK inhibitor) reduced pERK level and β-catenin activity but pAkt expression was rather elevated by selumetinib in these cells. Reduction of pERK levels was much stronger with selumetinib than gefitinib in both cells. The antiproliferative efficacy of selumetinib was more potent than that of gefitinib. However, the antiproliferative effect of gefitinib, as well as selumetinib, was not different between cell lines with or without HBx expression. Signal pathway activation by HBx might not be strong enough to attenuate the antiproliferative effect of EGFR-TK inhibitor. Future experiments are needed to understand the role of HBx protein expression in HCC treatment using molecular targeting agent.
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Affiliation(s)
- Yoon Kyung Park
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Kang Mo Kim
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Young-Joo Lee
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Ki-Hun Kim
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Sung-Gyu Lee
- Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Danbi Lee
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Ju Hyun Shim
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Young-Suk Lim
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Han Chu Lee
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Young-Hwa Chung
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Yung Sang Lee
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Dong Jin Suh
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Choi YJ, Jung MH, Park YK, Lee BY, Huh CY. Uterine müllerian adenosarcoma with sarcomatous overgrowth and lung metastasis in a 25-year-old woman. EUR J GYNAECOL ONCOL 2011; 32:91-94. [PMID: 21446335] [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: 05/30/2023]
Abstract
Uterine müllerian adenosarcoma with sarcomatous overgrowth (MASO), uncommon in premenopausal women, is a rare variant of uterine adenosarcomas characterized by a sarcomatous portion constituting >25% of the tumor. Uterine MASO often appears as a benign, protruding cervical polyp. However, in contrast to typical müllerian adenosarcomas (MAs), MASO is a highly aggressive tumor, frequently associated with a fatal outcome. Though very rare in premenopausal women, because of the high aggressiveness and malignant potential, uterine MASO should be considered, even in women of a young age with benign-appearing polypoid masses, and treated aggressively at the time of initial diagnosis without delay. We present herein a case of uterine MASO in a 25-year-old woman with lung metastasis who was lost to follow-up for one month after the initial diagnosis had been established.
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Affiliation(s)
- Y J Choi
- Department of Obstetrics and Gynecology, Kyung Hee University Medical Center, Seoul, Korea
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Cho SB, Kim JH, Cho S, Park JM, Park YK, Oh SH. Vitiligo in children and adolescents: association with thyroid dysfunction. J Eur Acad Dermatol Venereol 2010; 25:64-7. [DOI: 10.1111/j.1468-3083.2010.03694.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Abstract
The exact effect of probiotics on epithelial barrier function is not well understood. The aims of this study were to evaluate cytokine-induced epithelial barrier dysfunction in intestinal epithelial cells (IECs) and to study the role of probiotics in the prevention of epithelial barrier dysfunction. Caco-2 cells grown on transwell chambers were stimulated with tumor necrosis factor (TNF)-α or interferon (IFN)-γ basolaterally. Probiotic, Lactobacillus casei, was added 1 h before cytokine stimulation. MAPK inhibitors were added 15 min before L. casei stimulation. The electrical resistance and paracellular permeability of Caco-2 monolayers were measured. Distribution of zonula occludens (ZO)-1 protein was assessed by immunofluorescence, and Western blot analyses for ZO-1, p-Akt, and toll-like receptor (TLR) 2 were performed. Both TNF-α and IFN-γ stimulation on Caco-2 cells decreased transepithelial resistance (TER), increased epithelial permeability, and decreased ZO-1 expression of Caco-2 cells. In contrast, pretreatment of L. casei reversed the cytokine-induced dysfunction of TER, epithelial permeability, and ZO-1 expression. Reversal of cytokine-induced dysfunction of TER and intestinal permeability by L. casei was abrogated with MAPK inhibitor treatment. Lactobacillus casei stimulation on Caco-2 cells increased TLR2 and p-Akt expression. Probiotic, L. casei, prevents cytokine-induced epithelial barrier dysfunctions in IECs.
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Affiliation(s)
- Chang Soo Eun
- Department of Internal Medicine, Hanyang University Guri Hospital, Gyeonggi-Do, Korea
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Jin YJ, Park YK, Yun GJ, Lee HC, Jeong SH, Kim GM, Lim YS, Chung YH, Lee YS, Suh DJ. [Mutations within the interferon sensitivity determining region in Korean patients infected with hepatitis C virus genotype 1b]. Korean J Hepatol 2010; 16:158-67. [PMID: 20606500 DOI: 10.3350/kjhep.2010.16.2.158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND/AIMS The treatment response to interferon could differ with mutations in the interferon-sensitivity-determining region (ISDR) in patients infected with hepatitis C virus (HCV) genotype-1b (HCV-Ib). We examined the pattern of ISDR mutations and analyzed whether the number of amino acid substitutions influences the treatment response to peginterferon plus ribavirin in chronic hepatitis or cirrhotic patients infected with HCV-Ib. METHODS The study population comprised 52 patients who visited Seoul Asan Medical Center and Seoul National University Bundang Hospital from January 2006 to December 2008 and who received peginterferon alpha-2a (n=37) or -2b (n=15) plus ribavirin, and whose serum was stored. We analyzed the early virologic response, end-of-treatment response, and sustained virologic response (SVR), and examined the ISDR using direct sequencing. RESULTS The proportions of patients with ISDR mutation types of wild (0 mutations), intermediate (1-3 mutations), and mutant (> or =4 mutations) were 50.0%, 42.3%, and 7.7%, respectively, and the corresponding SVR rates were 63%, 50%, and 67% (p>0.05). The SVR rates were 59.4% and 50.0% in patients with <2 and > or =2 mutations, respectively (p>0.05). On univariate analysis, age was the only predictive factor for SVR (p=0.016). The pretreatment HCV RNA titer tended to be lower in those with SVR, but without statistical significance (p=0.069). CONCLUSIONS The frequency of ISDR mutations was low in our cohort of Korean patients infected with HCV-Ib. Therefore, ISDR mutations might not contribute to the response to treatment with peginterferon plus ribavirin.
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Affiliation(s)
- Young-Joo Jin
- Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Abstract
Electrical properties of single ZnO nanobelt have been examined by fabricating single nanobelt based field effect transistors (FETs). The ZnO nanobelts were grown via non-catalytic simple thermal evaporation process by using metallic zinc powder in the presence of oxygen. The detailed structural and optical characterizations confirmed that the grown nanobelts are well-crystalline with the wurtzite hexagonal phase and exhibiting good optical properties. The passivation effect on the electrical characteristics of the as-grown nanobelts was also evaluated by passivating the fabricated FETs with polymethyl methacrylate (PMMA). The passivated single ZnO nanobelt based FETs exhibited higher electrical performance as compared to non-passivated FETs due to reduction in the physically absorbed chemisorbed species such as O-, O2-, O2, or OH- etc. The field effect mobility (micro(eff)) of the fabricated nanobelt based non-passivated and passivated FETs was estimated to be approximately 21.3 and 59 cm2/V x s, respectively. Moreover the carrier concentration and peak transconductance of the fabricated non-passivated and passivated FET were calculated to be approximately 8.73 x 10(17) and approximately 1.86 x 10(18) cm(-3) and approximately 0.76 and 1.4 microS, respectively. This work offers substantial opportunities for further practical electronics and photonics nanodevice applications of ZnO based nanostructures.
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Affiliation(s)
- Y K Park
- School of Semiconductor and Chemical Engineering, BK 21 Centre for Future Energy Materials and Devices and Nanomaterials Processing Research Centre, Chonbuk National University, Jeonju 561-756, South Korea
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Kim BW, Bae BK, Lee JM, Won JH, Park YK, Xu WG, Wang HJ, Kim MW. Duct-to-duct biliary reconstructions and complications in 100 living donor liver transplantations. Transplant Proc 2009; 41:1749-55. [PMID: 19545721 DOI: 10.1016/j.transproceed.2009.02.097] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2008] [Accepted: 02/23/2009] [Indexed: 02/07/2023]
Abstract
OBJECTIVE We evaluated the risk factors for biliary complications and surgical procedures for duct-to-duct reconstructions in adult living donor liver transplantation (LDLT). PATIENTS AND METHODS From February 2005 to March 2008, we performed 100 cases of adult LDLT with duct-to-duct biliary reconstruction, using 64 right lobe grafts, 33 left lobe grafts, and 3 right lateral grafts. We employed 4 types of duct-to-duct procedures: all interrupted 6-0 Prolene suture (group 1, n = 9); continuous posterior and interrupted anterior wall 6-0 Prolene suture (group 2, n = 49); all continuous 7-0 Prolene suture (group 3, n = 26); and all continuous 7-0 Prolene suture with external stent (group 4, n = 16). Biliary complications were defined as an anastomosis stricture or a leakage. RESULTS Thirty-four patients experienced biliary complications during the follow-up period (median, 27 months). The incidence of stricture was 27% and that of leakage, 8%. There were no perioperative, intraoperative, or anatomic risk factors for biliary complications, except the type of duct-to-duct procedure. Group 1 and 2 patients showed higher incidences of biliary strictures than groups 3 and 4 (43.1% vs 4.7%; P = .00). Group 3 patients experienced a higher incidence of bile leakage than the other groups (23.1% vs 2.7%; P = .004). CONCLUSIONS The type of biliary reconstruction is a factor affecting biliary complications following duct-to-duct anastomosis in LDLT. Duct-to-duct biliary anastomosis with 7-0 monofilament suture and a small external stent is a feasible procedure in LDLT that significantly reduces the incidence of biliary complications.
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Affiliation(s)
- B W Kim
- Department of Surgery, Ajou University School of Medicine, Suwon, Korea
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Chung HK, Kang B, Lee JH, Shim JY, Park S, Lee SH, Park YK, Park E, Chung N, Shin MJ. Increased arterial stiffness is associated with reduced plasma levels of beta-carotene in treated hypertensive patients with type 2 diabetes mellitus. Nutr Metab Cardiovasc Dis 2009; 19:e9-e11. [PMID: 19505810 DOI: 10.1016/j.numecd.2009.03.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2008] [Revised: 02/22/2009] [Accepted: 03/17/2009] [Indexed: 12/12/2022]
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Cao Z, Song JH, Park YK, Maeng EJ, Nam SW, Lee JY, Park WS. The p53 codon 72 polymorphism and susceptibility to colorectal cancer in Korean patients. Neoplasma 2009; 56:114-8. [PMID: 19239324 DOI: 10.4149/neo_2009_02_114] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
UNLABELLED TP53 is a major gene involved in the determination of proliferation or growth arrest at the cellular level. The polymorphism of p53 at codon 72 has been widely studied; this variation has been associated with cancer susceptibility and disease outcome. The specific aim of this study was to investigate whether the p53 codon 72 polymorphism is associated with individual susceptibility to colorectal cancer in Korean patients. The frequency of the polymorphism was examined in 156 patients with colorectal cancer and in 293 healthy controls. The polymorphism analysis was performed by amplifying exon 4 of p53 and digesting the products with restriction enzyme. The frequencies of genotypes: Arg/Arg, Arg/Pro and Pro/Pro were 34.6% (54/156), 43.0% (67/156) and 22.4% (35/156), respectively, in the cases with colorectal cancer, and 28.9% (114/293), 47.8% (140/293) and 13.3% (39/293), respectively, in the healthy controls. Statistically, there was a significant difference in the frequency of the genotypes when the healthy controls were compared to the patients with colorectal cancer (<em>p</em>=0.0459). The specific allele frequencies showed borderline significance (<em>p</em>=0.0502). Our findings suggest that the p53 Pro72 variant is associated with an increased risk for colorectal cancer in the Korean population. KEYWORDS p53, colorectal cancer, polymorphism, susceptibility, metastasis.
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Affiliation(s)
- Z Cao
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Abstract
High aspect-ratio ZnO nanowires were grown onto the copper foil, in a large-quantity, by non-catalytic thermal evaporation method. The detailed morphological observations revealed that the diameters and lengths of as-grown nanowires are in the range of 60-100 nm and 10-30 microm, respectively exhibiting a very high-aspect ratio. Detailed structural characterizations confirmed that the as-grown nanowires are well crystalline and possess a wurtzite hexagonal phase, grown along the c-axis direction in preference. The presence of a sharp and strong UV emission at 381 nm in the room temperature photoluminescence (PL) spectrum affirmed that the obtained nanowires have good optical properties. The electrical transport properties of the as-grown nanowires was explored by fabricating the field effect transistors (FETs) using a single ZnO nanowire. From the fabricated single ZnO nanowire based FET, the electron carrier density and field effect mobility were estimated to be approximately 6.7 x 10(13) cm(-3) and approximately 3.8 cm2/Vs, respectively.
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Affiliation(s)
- Ahmad Umar
- School of Semiconductor and Chemical Engineering, BK21 Centre for Future Energy Materials and Devices, and Nanomaterials Processing Research Center, Chonbuk National University, Jeonju 561-756, South Korea
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Cho SB, Park JM, Oh SH, Kim HS, Park YK. Atypical hyperpigmentation after acitretin and narrow-band ultraviolet B combination therapy. J Eur Acad Dermatol Venereol 2009; 23:356-7. [DOI: 10.1111/j.1468-3083.2008.02879.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Park YK, Kim BW, Wang HJ, Kim MW. Auxiliary partial orthotopic living donor liver transplantation in a patient with Wilson's disease: a case report. Transplant Proc 2009; 40:3808-9. [PMID: 19100498 DOI: 10.1016/j.transproceed.2008.07.128] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2008] [Accepted: 07/02/2008] [Indexed: 11/29/2022]
Abstract
A patient with end-stage liver cirrhosis and neurological disorder due to Wilson's disease (WD) underwent auxiliary partial orthotopic liver transplantation (APOLT) using a living donor. He first visited our institute complaining of hand tremor, which was diagnosed as WD. Despite medical therapy, hepatic impairment progressed toward portal hypertensive complications. He was considered a suitable candidate for living donor-related liver transplantation. However, because of the impossibility of mobilization of the lateral section due to severe splenomegaly at the time of the recipient operation, we performed an APOLT using a right lobe graft. After transplantation, he suffered hepatic vein stenosis and biliary stenosis, receiving interventional therapy. The remnant native liver volume decreased, and the volume of the graft increased serially after transplantation. At the time of reporting, the patient had a normal working life with normal serum ceruloplasmin level and without neurologic problems at 26 months posttransplantation. APOLT may be a therapeutic option for patients with WD.
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Affiliation(s)
- Y K Park
- Department of Surgery, Ajou University School of Medicine, Suwon, Korea
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Park YK, Umar A, Kim SH, Hahn YB. Solution grown ultra-violet emitting quasi-aligned ZnO nanotubes. J Nanosci Nanotechnol 2008; 8:6349-6354. [PMID: 19205205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Quasi-aligned ZnO nanotubes were grown in a high density on Si substrate via aqueous solution method at low temperature of 65 degrees C by using zinc nitrate and hexamethylenetetramine. The detailed structural characterizations revealed that the as-synthesized nanotubes are single-crystalline possessing a hexagonal phase and grown along the [0001] direction. Raman-scattering spectrum exhibits a strong and sharp optical-phonon E2 high-mode at 437 cm(-1) again confirming the good crystal quality with hexagonal crystal structure for the as-synthesized nanotubes. A strong ultraviolet (UV) emission with a weak and broad orange is observed from the room-temperature photoluminescence (PL) spectrum which substantiates the good optical properties for the as-grown nanotubes. The detailed growth mechanism has also been proposed for the formation of as-grown nanotubes based on chemical reactions involved and different crystallographic habits of wurtzite hexagonal ZnO.
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Affiliation(s)
- Y K Park
- School of Semiconductor and Chemical Engineering, and BK 21, Centre for Future Energy Materials and Devices, Chonbuk National University, Jeonju, South Korea 561-756
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Chun BH, Bang WG, Park YK, Woo SK. Stable expression of recombinant human coagulation factor XIII in protein-free suspension culture of Chinese hamster ovary cells. Cytotechnology 2008; 37:179-87. [PMID: 19002921 DOI: 10.1023/a:1020555918441] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
The recombinant a and bsubunits for human coagulation factor XIII were transfected into Chinese hamster ovary (CHO) cells. CHO cells were amplified and selected with methotrexate in adherent cultures containing serum, and CHO 1-62 cells were later selected in protein-free medium. To develop a recombinant factor XIII production process in a suspension culture, we have investigated the growth characteristics of CHO cells and the maintenance of factor XIII expression in the culture medium. Suspension adaptation of CHO cells was performed in protein-free medium, GC-CHO-PI, by two methods, such as serum weaning and direct switching from serum containing media to protein-free media. Although the growth of CHO cells in suspension culture was affected initially by serum depletion, cell specific productivity of factor XIII showed only minor changes by the direct switching to protein-free medium during a suspension culture. As for the long-term stability of factor XIII, CHO 1-62 cells showed a stable expression of factor XIII in protein-free condition for 1000 h. These results indicate that the CHO 1-62cells can be adapted to express recombinant human factor XIII in a stable maimer in suspension culture using a protein-free medium. Our results demonstrate that enhanced cell growth in a continuous manner is achievable for factor XIII production in a protein-free medium when a perfusion bioreactor culture system with a spin filter is employed.
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Affiliation(s)
- B H Chun
- Korea Green Cross Corp, 227 Kugal-Ri, Keeheung-Eup, 449-900, Yongin, Korea
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Park YK, Umar A, Kim SH, Kim JH, Lee EW, Vaseem M, Hahn YB. Comparison between the electrical properties of ZnO nanowires based field effect transistors fabricated by back- and top-gate approaches. J Nanosci Nanotechnol 2008; 8:6010-6016. [PMID: 19198339 DOI: 10.1166/jnn.2008.478] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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
Large-quality, well-crystallized growth of ZnO nanowires was done via non-catalytic thermal evaporation process on silicon substrate only by using metallic zinc powder and oxygen as source materials for zinc and oxygen, respectively. The electrical properties of the as-grown ZnO nanowires were examined by fabricating a single nanowire based FETs which were fabricated via two approaches, i.e., back- and top-gate approaches by using electron beam lithography (EBL) and photolithography processes. ZnO FETs electrical properties were characterized by I(DS)-V(DS) and I(DS)-V(GS) measurement. The fabricated single ZnO nanowire based FETs by back- and top-gate approaches exhibited field effect mobilities of approximately 4.25 and approximately 12.76 cm2/Vs, respectively. Moreover, the carrier concentrations for the fabricated back- and top-gate FETs were approximately 1.6 x 10(17) and approximately 1.37 x 10(18) cm(-3), respectively. From our studies it was observed that the fabricated top-gate FETs exhibited higher and good electrical properties as compared to ZnO nanowire FETs fabricated using back-gate approaches.
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Affiliation(s)
- Y K Park
- School of Semiconductor and Chemical Engineering, BK21 Center for Future Energy Materials and Devices, and Nanomaterials Processing Research Center, Chonbuk National University, Jeonju, 561-756, South Korea
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Cho YG, Lee HS, Song JH, Kim CJ, Park YK, Nam SW, Yoo NJ, Lee JY, Park WS. KLF6 IVS1 -27G/A polymorphism with susceptibility to gastric cancers in Korean. Neoplasma 2008; 55:47-50. [PMID: 18190240] [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: 05/25/2023]
Abstract
KLF6 is a key cell cycle regulator that is downregulated in several kinds of human cancers, including gastric cancer. The IVS1 -27G/A polymorphism of KLF6 has been investigated, which can influence susceptibility to gastric cancer and disease outcome. In order to investigate whether the IVS1 -27G/A polymorphism of KLF6 is associated with individual susceptibility to gastric cancer in Korea, the frequency of the polymorphism was examined in 264 gastric cancer patients and 299 healthy controls. Single nucleotide polymorphism (SNP) analysis was performed by amplifying intron 1 of KLF6 and sequencing the products. The frequencies of genotypes: G/G, G/A and A/A were 91.7% (242/264), 5.7% (15/264) and 2.6%, respectively, in gastric cancer cases and 91.9%, 7.0% and 1.1%, respectively, in healthy controls. Genotype frequencies in Korean population were very similar to those of Caucasian population. Interestingly, the male gastric cancer patients showed a significantly higher proportion of the G allele (Chi-Square test, P=0.005) compared to female gastric cancer patients. However, the polymorphism was statistically not associated with increased risk of gastric cancer in Korea. When stratified by histological subtype of gastric cancer, the risk was also not statistically significant. Thus, our results suggested that the IVS1 -27G/A polymorphism of KLF6 is not associated with an increased risk for gastric cancer in Korean population.
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Affiliation(s)
- Y G Cho
- Department of Pathology, College of Medicine, The Catholic University of Korea, Seoul, Korea
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Park YK, Koo HC, Kim SH, Hwang SY, Jung WK, Kim JM, Shin S, Kim RT, Park YH. The analysis of milk components and pathogenic bacteria isolated from bovine raw milk in Korea. J Dairy Sci 2007; 90:5405-14. [PMID: 18024731 DOI: 10.3168/jds.2007-0282] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Bovine mastitis can be diagnosed by abnormalities in milk components and somatic cell count (SCC), as well as by clinical signs. We examined raw milk in Korea by analyzing SCC, milk urea nitrogen (MUN), and the percentages of milk components (milk fat, protein, and lactose). The associations between SCC or MUN and other milk components were investigated, as well as the relationships between the bacterial species isolated from milk. Somatic cell counts, MUN, and the percentages of milk fat, protein, and lactose were analyzed in 30,019 raw milk samples collected from 2003 to 2006. The regression coefficients of natural logarithmic-transformed SCC (SCCt) on milk fat (-0.0149), lactose (-0.8910), and MUN (-0.0096), and those of MUN on milk fat (-0.3125), protein (-0.8012), and SCCt (-0.0671) were negative, whereas the regression coefficient of SCCt on protein was positive (0.3023). When the data were categorized by the presence or absence of bacterial infection in raw milk, SCCt was negatively associated with milk fat (-0.0172), protein (-0.2693), and lactose (-0.4108). The SCCt values were significantly affected by bacterial species. In particular, 104 milk samples infected with Staphylococcus aureus had the highest SCCt (1.67) compared with milk containing other mastitis-causing bacteria: coagulase-negative staphylococci (n = 755, 1.50), coagulase-positive staphylococci (except Staphylococcus aureus; n = 77, 1.59), Streptococcus spp. (Streptococcus dysgalactiae, n = 37; Streptococcus uberis, n = 12, 0.83), Enterococcus spp. (n = 46, 1.04), Escherichia coli (n = 705, 1.56), Pseudomonas spp. (n = 456, 1.59), and yeast (n = 189, 1.52). These results show that high SCC and MUN negatively affect milk components and that a statistical approach associating SCC, MUN, and milk components by bacterial infection can explain the patterns among them. Bacterial species present in raw milk are an important influence on SCC in Korea.
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Affiliation(s)
- Y K Park
- Department of Microbiology, College of Veterinary Medicine and the BK21 Program for Veterinary Science, Seoul National University, Seoul, Republic of Korea
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Umar A, Kim SH, Kim JH, Park YK, Hahn YB. Low-temperature growth of flower-shaped UV-emitting ZnO nanostructures on steel alloy by thermal evaporation. J Nanosci Nanotechnol 2007; 7:4421-7. [PMID: 18283822 DOI: 10.1166/jnn.2007.857] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Flower-shaped ZnO nanostructures, containing the triangular-shaped petals (sharpened tips and wider bases) have been achieved by simple thermal evaporation of high purity metallic zinc powder in the presence of oxygen at 440 degrees C on steel alloy substrate without the use of metal catalyst or additives. Detailed structural studies confirm that the obtained flower-shaped nanostructures are single crystalline and possesses a wurtzite hexagonal structure, grown along the c-axis in the [0001] direction. Raman and room temperature photoluminescence analysis substantiate a wurtzite hexagonal phase with a good crystal quality and a strong UV emission at 378 nm, respectively, indicating few or no structural defects. Additionally, a detailed possible growth mechanism has also been discussed.
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Affiliation(s)
- Ahmad Umar
- School of Chemical Engineering and Technology, Chonbuk National University, Chonju 561-756, South Korea
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