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Goo D, Park I, Nam H, Lee Y, Sawall J, Smith AH, Rehberger TG, Li C, Lillehoj HS. Collagen adhesin protein and necrotic enteritis B-like toxin as biomarkers for early diagnosis of necrotic enteritis in commercial broiler chickens. Poult Sci 2023; 102:102647. [PMID: 37060834 PMCID: PMC10139936 DOI: 10.1016/j.psj.2023.102647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 03/07/2023] [Accepted: 03/08/2023] [Indexed: 03/14/2023] Open
Abstract
Mouse monoclonal antibodies (mAbs) reactive with Clostridium perfringens collagen adhesin protein (CNA) and necrotic enteritis B-like toxin (NetB) were developed. The best capture/detection mAb pairs for CNA and NetB were selected based on their affinity and specificity to develop sandwich enzyme-linked immunosorbent assays (ELISAs) to detect CNA and NetB proteins, respectively, in jejunal digesta samples from commercial broiler farms in the United States. Prior to the analysis of samples from commercial broiler flocks, the specificity and sensitivity of the CNA and NetB ELISAs were validated using sera, jejunal digesta, and fecal samples from chickens coinfected with Eimeria maxima and CNA+/NetB+C. perfringens in an animal model of necrotic enteritis (NE). Subsequently, a total of 251 field samples were collected from 74 commercial poultry farms. Among these, 18 samples were from 6 broiler farms that used certified organics (CO), and 155 samples were from 42 farms with nonantibiotics (NA). In jejunal digesta samples, CNA levels ranged from 0.02 to 0.59 ng/mL and NetB levels ranged from 0.09 to 1.91 ng/mL. CNA and NetB levels showed a positive correlation with each other (Pearson correlation coefficient r = 0.772, P < 0.001). CNA and NetB levels in jejunal digesta were significantly decreased in CO farms compared with those from NA farms (P < 0.001). In conclusion, these new C. perfringens antigen-specific sandwich ELISAs offer a sensitive and specific means to detect C. perfringens CNA and NetB proteins as biomarkers of early NE occurrence in field samples from commercial broiler chickens.
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Affiliation(s)
- D Goo
- Animal Bioscience and Biotechnology Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, USA; Department of Poultry Science, University of Georgia, Athens, GA, USA
| | - I Park
- Animal Bioscience and Biotechnology Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, USA
| | - H Nam
- Animal Bioscience and Biotechnology Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, USA
| | - Y Lee
- Animal Bioscience and Biotechnology Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, USA
| | - J Sawall
- Arm & Hammer Animal and Food Production, Waukesha, WI, USA
| | - A H Smith
- Arm & Hammer Animal and Food Production, Waukesha, WI, USA
| | - T G Rehberger
- Arm & Hammer Animal and Food Production, Waukesha, WI, USA
| | - C Li
- Animal Bioscience and Biotechnology Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, USA
| | - H S Lillehoj
- Animal Bioscience and Biotechnology Laboratory, Beltsville Agricultural Research Center, Agricultural Research Service, USDA, Beltsville, MD, USA.
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Kim JE, Nam H, Park JI, Cho H, Lee J, Kim HE, Kim DK, Joo KW, Kim YS, Kim BS, Park S, Lee H. Gut Microbial Genes and Metabolism for Methionine and Branched-Chain Amino Acids in Diabetic Nephropathy. Microbiol Spectr 2023; 11:e0234422. [PMID: 36877076 PMCID: PMC10100834 DOI: 10.1128/spectrum.02344-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Accepted: 01/23/2023] [Indexed: 03/07/2023] Open
Abstract
Diabetic mellitus nephropathy (DMN) is a serious complication of diabetes and a major health concern. Although the pathophysiology of diabetes mellitus (DM) leading to DMN is uncertain, recent evidence suggests the involvement of the gut microbiome. This study aimed to determine the relationships among gut microbial species, genes, and metabolites in DMN through an integrated clinical, taxonomic, genomic, and metabolomic analysis. Whole-metagenome shotgun sequencing and nuclear magnetic resonance metabolomic analyses were performed on stool samples from 15 patients with DMN and 22 healthy controls. Six bacterial species were identified to be significantly elevated in the DMN patients after adjusting for age, sex, body mass index, and estimated glomerular filtration rate (eGFR). Multivariate analysis found 216 microbial genes and 6 metabolites (higher valine, isoleucine, methionine, valerate, and phenylacetate levels in the DMN group and higher acetate levels in the control group) that were differentially present between the DMN and control groups. Integrated analysis of all of these parameters and clinical data using the random-forest model showed that methionine and branched-chain amino acids (BCAAs) were among the most significant features, next to the eGFR and proteinuria, in differentiating the DMN group from the control group. Metabolic pathway gene analysis of BCAAs and methionine also revealed that many genes involved in the biosynthesis of these metabolites were elevated in the six species that were more abundant in the DMN group. The suggested correlation among taxonomic, genetic, and metabolic features of the gut microbiome would expand our understanding of gut microbial involvement in the pathogenesis of DMN and may provide potential therapeutic targets for DMN. IMPORTANCE Whole metagenomic sequencing uncovered specific members of the gut microbiota associated with DMN. The gene families derived from the discovered species are involved in the metabolic pathways of methionine and branched-chain amino acids. Metabolomic analysis using stool samples showed increased methionine and branched-chain amino acids in DMN. These integrative omics results provide evidence of the gut microbiota-associated pathophysiology of DMN, which can be further studied for disease-modulating effects via prebiotics or probiotics.
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Affiliation(s)
- Ji Eun Kim
- Department of Internal Medicine, Korea University Guro Hospital, Seoul, South Korea
| | - Hoonsik Nam
- College of Pharmacy, Natural Products Research Institute, Seoul National University, Seoul, South Korea
| | - Ji In Park
- Department of Internal Medicine, Kangwon National University Hospital, Chuncheon, South Korea
| | - Hyunjeong Cho
- Department of Internal Medicine, Chungbuk National University Hospital, Cheongju, South Korea
| | - Jangwook Lee
- Department of Internal Medicine, Dongguk University Ilsan Hospital, Ilsan, South Korea
| | - Hyo-Eun Kim
- Seoul National University Hospital Biomedical Research Institute, Seoul, South Korea
| | - Dong Ki Kim
- Kidney Research Institute, Seoul National University, Seoul, South Korea
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - Kwon Wook Joo
- Kidney Research Institute, Seoul National University, Seoul, South Korea
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - Yon Su Kim
- Kidney Research Institute, Seoul National University, Seoul, South Korea
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
| | - Bong-Soo Kim
- Department of Life Science, Multidisciplinary Genome Institute, Hallym University, Chuncheon, South Korea
| | - Sunghyouk Park
- College of Pharmacy, Natural Products Research Institute, Seoul National University, Seoul, South Korea
| | - Hajeong Lee
- Department of Internal Medicine, Seoul National University Hospital, Seoul, South Korea
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
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Jeon H, Kim G, Nam H, Suh S. The Function of Bedtime Procrastination in Individuals with Clinical Insomnia. Sleep Med 2022. [DOI: 10.1016/j.sleep.2022.05.385] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Nam H, Kang S, Park MS, Kang S, Kim HS, Mai VH, Kim J, Lee H, Lee W, Suh YJ, Lim JH, Kim SY, Kim SC, Kim SH, Jung KH, Hong SS, Park S. A Serum Marker for Early Pancreatic Cancer with a Possible Link to Diabetes. J Natl Cancer Inst 2021; 114:228-234. [PMID: 34613397 DOI: 10.1093/jnci/djab191] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 07/23/2021] [Accepted: 09/16/2021] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Pancreatic cancer (PC) has a grim prognosis, and an early diagnostic biomarker has been highly desired. The molecular link between diabetes and PC has not been well-established. METHODS Bioinformatics screening was performed for a serum PC marker. Experiments in cell lines (5 PC and 1 normal cell lines), mouse models, and human tissue staining (37 PC and 10 normal cases) were performed to test asprosin production from PC. Asprosin's diagnostic performance was tested with serums from multi-center cohorts (347 PC, 209 normal, and 55 additional diabetic subjects) and evaluated according to PC status, stages, and diabetic status, which was compared with that of CA19-9. RESULTS Asprosin, a diabetes-related hormone, was found from the bioinformatics screening, and its production from PC was confirmed. Serum asprosin levels from multi-center cohorts yielded an age-adjusted diagnostic AUC of 0.987 (95% confidence interval [CI] = 0.961 to 0.997), superior to that of CA19-9 (AUC = 0.876, 95% CI = 0.847 to 0.905), and a cut-off of 7.18 ng/mL, at which the validation set exhibited a sensitivity of 0.957 and a specificity of 0.924. Importantly, the performance was maintained in early-stage and non-metastatic PC, consistent with the tissue staining. A slightly lower performance against additional diabetic patients (n = 55) was restored by combining asprosin and CA19-9 (AUC = 0.985, 95% CI = 0.975 to 0.995). CONCLUSION Asprosin is presented as an early-stage PC serum marker that may provide clues for PC-induced diabetes. Larger prospective clinical studies are warranted to solidify its utility.
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Affiliation(s)
- Hoonsik Nam
- Natural Product Research Institute, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Sunmi Kang
- Natural Product Research Institute, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Min Seok Park
- Department of Biomedical Sciences, College of Medicine, and Program in Biomedical Science & Engineering, Inha University, Incheon, Korea
| | - Suyeon Kang
- Department of Statistics, College of Natural Sciences, Inha University, Incheon, Korea
| | - Han Sun Kim
- Natural Product Research Institute, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Van-Hieu Mai
- Natural Product Research Institute, College of Pharmacy, Seoul National University, Seoul, Korea
| | - Juyoung Kim
- Department of Biomedical Sciences, College of Medicine, and Program in Biomedical Science & Engineering, Inha University, Incheon, Korea
| | - Ho Lee
- Graduate School of Cancer Science and Policy, National Cancer Center, Goyang, Korea
| | - Woohyung Lee
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
| | - Young Ju Suh
- Department of Biomedical Sciences, College of Medicine, and Program in Biomedical Science & Engineering, Inha University, Incheon, Korea
| | - Joo Han Lim
- Division of Hematology and Oncology, Department of Internal Medicine, Inha University Hospital, Inha University, Incheon, Korea
| | - Soo-Youl Kim
- Division of Cancer Biology, Research Institute, National Cancer Center, Goyang, Korea
| | - Song Cheol Kim
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
| | - So Hun Kim
- Department of Endocrinology and Metabolism, Department of Internal Medicine, Inha University Hospital, Inha University, Incheon, Korea
| | - Kyung Hee Jung
- Department of Biomedical Sciences, College of Medicine, and Program in Biomedical Science & Engineering, Inha University, Incheon, Korea
| | - Soon-Sun Hong
- Department of Biomedical Sciences, College of Medicine, and Program in Biomedical Science & Engineering, Inha University, Incheon, Korea
| | - Sunghyouk Park
- Natural Product Research Institute, College of Pharmacy, Seoul National University, Seoul, Korea
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Nam H, Kim J, Woo S, Park S, Lee H, Jang H, Park† K, Suh† S. 0971 Mother’s Parenting Style As A Moderator In The Relationship Between Temperament And Sleep Problems In Children With Obesity. Sleep 2020. [DOI: 10.1093/sleep/zsaa056.967] [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: 11/13/2022] Open
Abstract
Abstract
Introduction
Based on past studies, a child’s temperament and parenting style greatly affect a child’s sleep. However, there are limited studies that have investigated how parenting styles and a child’s temperament interact and affect the child’s sleep in obese children. Thus, this study investigated parenting styles as a moderator in the relationship between temperament and sleep in obese children.
Methods
Seventy-seven obese children (male=66.2%, average BMI = 27.35±2.78) participated in the study. The mean age of the participants was 10.82(± 1.00) years. The primary caregiver (mother) of the participants completed the Junior Temperament and Character Inventory (J-TCI), and Parents as Social Context Questionnaire (K-PSCQ), and Children’s Sleep Habits Questionnaire (CSHQ). Among the different subscales, only Novelty Seeking (NS) and Reward Dependence (RD) were used for analysis among Junior Temperament and Character Inventory (J-TCI) components.
Results
In this sample, 66 children (85.7%) reported significant levels of sleep problems based on the CSHQ. Novelty seeking (NS) and reward dependence (RD) significantly predicted sleep problems (B=-.771, p<.05, B=-.683, p<.01). Additionally, mother’s negative parenting style moderated the relationship between NS and the child’s sleep problem [B=.03, 95% CI=.007, .049] and the relationship between RD and the child’s sleep problem [B=.031, 95% CI=.013, .049]. The more negative mother’s parenting style, the higher the child’s NS or RD scores had a negative effect on sleep.
Conclusion
The results of this study show that obese children experience high levels of sleep disturbance. Additionally, the mother’s negative parenting style moderated the relationship between temperament and sleep problems in obese children. The results suggest that sleep interventions for obese children should include the mother, especially in children with high novelty seeking and reward dependence.
Support
This work was supported by Korea Centers for Disease Control and Prevention & Korea National Research Institute of Health (2019020660E-00)
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Affiliation(s)
- H Nam
- SUNGSHIN WOMEN’S UNIVERSITY, Seoul, KOREA, REPUBLIC OF
| | - J Kim
- SUNGSHIN WOMEN’S UNIVERSITY, Seoul, KOREA, REPUBLIC OF
| | - S Woo
- Department of Medical Science, Hallym University School of Medicine, Chuncheon, KOREA, REPUBLIC OF
| | - S Park
- Center for Biomedical Sciences, Korea National Institute of Health, Cheongju, Chungbuk, KOREA, REPUBLIC OF
| | - H Lee
- Center for Biomedical Sciences, Korea National Institute of Health, Cheongju, Chungbuk, KOREA, REPUBLIC OF
| | - H Jang
- Center for Biomedical Sciences, Korea National Institute of Health, Cheongju, Chungbuk, KOREA, REPUBLIC OF
| | - K Park†
- Department of Family Medicine, Hallym University Sacred Heart Hospital, Hallym University School of Medicine, Anayng, KOREA, REPUBLIC OF
| | - S Suh†
- SUNGSHIN WOMEN’S UNIVERSITY, Seoul, KOREA, REPUBLIC OF
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Lee E, Lee J, Hur M, Park HY, Yum H, Nam H, Oh MY, Choi H, Kim J, Cho B, Lim Y, Won J. MG1124, a novel CEACAM1-targeted monoclonal antibody, has therapeutic potential as a combination partner of PD-1 inhibitors in NSCLC patients. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz253.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Shin C, Lee J, Kim YK, Nam H, Yoon EJ, Shin SA, Kim H, Jeon B. Cognitive decline in association with hyposmia in idiopathic rapid eye movement sleep behavior disorder: a prospective 2‐year follow‐up study. Eur J Neurol 2019; 26:1417-1420. [DOI: 10.1111/ene.14025] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Accepted: 06/18/2019] [Indexed: 11/29/2022]
Affiliation(s)
- C. Shin
- Department of Neurology Kyung Hee University Hospital SeoulKorea
| | - J.‐Y. Lee
- Department of Neurology Seoul National University Boramae Hospital SeoulKorea
| | - Y. K. Kim
- Department of Nuclear Medicine Seoul National University Boramae Hospital SeoulKorea
| | - H. Nam
- Department of Neurology Seoul National University Boramae Hospital SeoulKorea
| | - E. J. Yoon
- Department of Nuclear Medicine Seoul National University Boramae Hospital SeoulKorea
| | - S. A. Shin
- Department of Nuclear Medicine Seoul National University Boramae Hospital SeoulKorea
| | - H.‐J. Kim
- Department of Neurology Seoul National University Hospital Seoul Korea
| | - B. Jeon
- Department of Neurology Seoul National University Hospital Seoul Korea
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Choi C, Kang D, Kim H, Park S, Kim S, Nam H. Clinical outcomes of rectal neuroendocrine tumors less than 20 mm: a single institutional analysis of 371 patients. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz156.033] [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: 11/13/2022] Open
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Choi C, Kim S, Kang D, Park S, Nam H. Can an undifferentiated type early gastric cancer be a candidate for endoscopic resection? Ann Oncol 2019. [DOI: 10.1093/annonc/mdz155.066] [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: 11/12/2022] Open
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Kim ER, Kwon HN, Nam H, Kim JJ, Park S, Kim YH. Urine-NMR metabolomics for screening of advanced colorectal adenoma and early stage colorectal cancer. Sci Rep 2019; 9:4786. [PMID: 30886205 PMCID: PMC6423046 DOI: 10.1038/s41598-019-41216-y] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Accepted: 02/01/2019] [Indexed: 12/13/2022] Open
Abstract
Although colorectal cancer (CRC) is considered one of the most preventable cancers, no non-invasive, accurate diagnostic tool to screen CRC exists. We explored the potential of urine nuclear magnetic resonance (NMR) metabolomics as a diagnostic tool for early detection of CRC, focusing on advanced adenoma and stage 0 CRC. Urine metabolomics profiles from patients with colorectal neoplasia (CRN; 36 advanced adenomas and 56 CRCs at various stages, n = 92) and healthy controls (normal, n = 156) were analyzed by NMR spectroscopy. Healthy and CRN groups were statistically discriminated using orthogonal projections to latent structure discriminant analysis (OPLS-DA). The class prediction model was validated by three-fold cross-validation. The advanced adenoma and stage 0 CRC were grouped together as pre-invasive CRN. The OPLS-DA score plot showed statistically significant discrimination between pre-invasive CRN as well as advanced CRC and healthy controls with a Q2 value of 0.746. In the prediction validation study, the sensitivity and specificity for diagnosing pre-invasive CRN were 96.2% and 95%, respectively. The grades predicted by the OPLS-DA model showed that the areas under the curve were 0.823 for taurine, 0.783 for alanine, and 0.842 for 3-aminoisobutyrate. In multiple receiver operating characteristics curve analyses, taurine, alanine, and 3-aminoisobutyrate were good discriminators for CRC patients. NMR-based urine metabolomics profiles significantly and accurately discriminate patients with pre-invasive CRN as well as advanced CRC from healthy individuals. Urine-NMR metabolomics has potential as a screening tool for accurate diagnosis of pre-invasive CRN.
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Affiliation(s)
- Eun Ran Kim
- Departments of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Hyuk Nam Kwon
- College of Pharmacy, Natural Product Research Institute, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, Korea.,Helsinki Institute of Life Science/Medicum, University of Helsinki, Helsinki, Finland
| | - Hoonsik Nam
- College of Pharmacy, Natural Product Research Institute, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, Korea
| | - Jae J Kim
- Departments of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Sunghyouk Park
- College of Pharmacy, Natural Product Research Institute, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, Korea.
| | - Young-Ho Kim
- Departments of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
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Park HY, Nam H, Kwon H, Yu C, Song S, Oh I, Yang H, Jo EC, Won J, Eun SY. A dual-targeting fusion protein, human PVR-4-1BBL for immunotherapy in AML. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy487.022] [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: 11/13/2022] Open
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Kang D, Choi C, Kim H, Park S, Kim S, Ryu D, Ko J, Lee J, Lee J, Lee K, Kwon B, Kim H, Nam H. Associated factors with overlooked multiple synchronous gastric epithelial neoplasia. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.068] [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: 11/13/2022] Open
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Kim S, Choi C, Kang D, Kim H, Park S, Ryu D, Ko J, Kim H, Kwon B, Lee K, Lee J, Lee J, Nam H. Clinical outcomes of endoscopic submucosal dissection for lesions on the proximal location of the stomach. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.067] [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: 11/14/2022] Open
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14
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Kang D, Kim H, Choi C, Park S, Kim S, Nam H, Ryu D, Ko J, Kim H, Kwon B, Lee K, Lee J, Lee J. Long-term clinical outcomes in large colorectal polyps with indefinite or positive resection margin after endoscopic resection. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.228] [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: 11/14/2022] Open
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15
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Koo D, Lee J, Nam H. Sleep problems in patients with synucleinopathy and REM sleep behavior disorder. Sleep Med 2017. [DOI: 10.1016/j.sleep.2017.11.494] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Nam H, Kim C, Kim D, Lim J, Jeon S, Kim J, Lee Y, Cho J, Ryu J. P2.01-016 Prognostic Impact of a New Score Using Neutrophil-To-Lymphocyte Ratios in the Serum and Malignant Pleural Effusion in Lung Cancer Patients. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1118] [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: 11/27/2022]
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Lee S, Nam H, Lee Y. Cariporide Enhances DNA Damage and Apoptosis of Malignant Mesothelioma Cells Preadapted to Acidic Environment. Clin Ther 2017. [DOI: 10.1016/j.clinthera.2017.05.154] [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: 10/19/2022]
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18
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Jeong MK, Hwang C, Nam H, Cho YS, Kang BY, Cho EC. Effect of the gel elasticity of model skin matrices on the distance/depth-dependent transmission of vibration energy supplied from a cosmetic vibrator. Int J Cosmet Sci 2016; 39:42-48. [PMID: 27264842 DOI: 10.1111/ics.12346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 06/02/2016] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The purpose of this study was to determine how the energies supplied from a cosmetic vibrator are deeply or far transferred into organs and tissues, and how these depths or distances are influenced by tissue elasticity. METHODS External vibration energy was applied to model skin surfaces through a facial cleansing vibrator, and we measured a distance- and depth-dependent energy that was transferred to model skin matrices. As model skin matrices, we synthesized hard and soft poly(dimethylsiloxane) (PDMS) gels, as well as hydrogels with a modulus of 2.63 MPa, 0.33 MPa and 21 kPa, respectively, mostly representing those of skin and other organs. The transfer of vibration energy was measured either by increasing the separation distances or by increasing the depth from the vibrator. RESULTS The energies were transmitted deeper into the hard PDMS than into the soft PDMS and hydrogel matrices. This finding implies that the vibration forces influence a larger area of the gel matrices when the gels are more elastic (or rigid). There were no appreciable differences between the soft PDMS and hydrogel matrices. However, the absorbed energies were more concentrated in the area closest to the vibrator with decreasing elasticity of the matrix. Softer materials absorbed most of the supplied energy around the point of the vibrator. In contrast, harder materials scattered the external energy over a broad area. CONCLUSIONS The current results are the first report in estimating how the external energy is deeply or distantly transferred into a model skins depending on the elastic moduli of the models skins. In doing so, the results would be potentially useful in predicting the health of cells, tissues and organs exposed to various stimuli.
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Affiliation(s)
- M K Jeong
- Department of Chemical Engineering, Hanyang University, Seoul, 04763, South Korea
| | - C Hwang
- Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea
| | - H Nam
- Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea
| | - Y S Cho
- Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea
| | - B Y Kang
- Amorepacific Corporation R&D Center, Yonggu-daero, Yongin, 446-729, South Korea
| | - E C Cho
- Department of Chemical Engineering, Hanyang University, Seoul, 04763, South Korea
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Nam H, Galen K, Campara M, Perni N, Garcia-Roca R, Yeldandi V. Significance of preservation fluid cultures in solid organ transplantation. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.02.461] [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: 10/22/2022] Open
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Nam H, Kerman IA. Distribution of catecholaminergic presympathetic-premotor neurons in the rat lower brainstem. Neuroscience 2016; 324:430-45. [PMID: 26946268 DOI: 10.1016/j.neuroscience.2016.02.066] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 11/21/2015] [Revised: 02/11/2016] [Accepted: 02/26/2016] [Indexed: 11/15/2022]
Abstract
We previously characterized the organization of presympathetic-premotor neurons (PSPMNs), which send descending poly-synaptic projections with collaterals to skeletal muscle and the adrenal gland. Such neurons may play a role in shaping integrated adaptive responses, and many of them were found within well-characterized regions of noradrenergic cell populations suggesting that some of the PSPMNs are catecholaminergic. To address this issue, we used retrograde trans-synaptic tract-tracing with attenuated pseudorabies virus (PRV) recombinants combined with multi-label immunofluorescence to identify PSPMNs expressing tyrosine hydroxylase (TH). Our findings indicate that TH-immunoreactive (ir) PSPMNs are present throughout the brainstem within multiple cell populations, including the A1, C1, C2, C3, A5 and A7 cell groups along with the locus coeruleus (LC) and the nucleus subcoeruleus (SubC). The largest numbers of TH-ir PSPMNs were located within the LC and SubC. Within SubC and the A7 cell group, about 70% of TH-ir neurons were PSPMNs, which was a significantly greater fraction of neurons than in the other brain regions we examined. These findings indicate that TH-ir neurons near the pontomesencephalic junction that are distributed across the LC, SubC, and the A7 may play a prominent role in somatomotor-sympathetic integration, and that the major functional role of the A7 and SubC noradrenergic cell groups maybe in the coordination of concomitant activation of somatomotor and sympathetic outflows. These neurons may participate in mediating homeostatic adaptations that require simultaneous activation of sympathetic and somatomotor nerves in the periphery.
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Affiliation(s)
- H Nam
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States; Cell Molecular and Developmental Biology Theme, Graduate Biomedical Sciences Program, University of Alabama at Birmingham, Birmingham, AL, United States
| | - I A Kerman
- Department of Psychiatry and Behavioral Neurobiology, University of Alabama at Birmingham, Birmingham, AL, United States.
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Koo D, Nam H. Association between obstructive sleep apnea syndrome and cerebral microbleeds in patients with ischemic stroke. Sleep Med 2015. [DOI: 10.1016/j.sleep.2015.02.490] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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22
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Min S, Nam H, Kwon D, Hwang S, Kim M. Correlation of maxillo-mandibular skeletal changes and change of lip canting in two jaw orthognathic surgery for correction of facial asymmetry. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.705] [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: 11/26/2022]
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Hue N, Nam H, Tung N. A Preliminary Investigation of Pentachlorobenzene Amount Created from Municipal Waste Incinerators and Industrial Furnaces at Some Provinces in Northern Vietnam. ACTA ACUST UNITED AC 2015. [DOI: 10.14233/ajchem.2015.18726] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kim HS, Park YH, Nam H, Lee YM, Song K, Choi C, Ahn I, Park SR, Lee YH, Hwang DJ. Overexpression of the Brassica rapa transcription factor WRKY12 results in reduced soft rot symptoms caused by Pectobacterium carotovorum in Arabidopsis and Chinese cabbage. Plant Biol (Stuttg) 2014; 16:973-981. [PMID: 24552622 DOI: 10.1111/plb.12149] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Accepted: 12/03/2013] [Indexed: 06/03/2023]
Abstract
Chinese cabbage (Brassica rapa L. ssp. pekinensis), an important vegetable crop, can succumb to diseases such as bacterial soft rot, resulting in significant loss of crop productivity and quality. Pectobacterium carotovorum ssp. carotovorum (Pcc) causes soft rot disease in various plants, including Chinese cabbage. To overcome crop loss caused by bacterial soft rot, a gene from Chinese cabbage was isolated and characterised in this study. We isolated the BrWRKY12 gene from Chinese cabbage, which is a group II member of the WRKY transcription factor superfamily. The 645-bp coding sequence of BrWRKY12 translates to a protein with a molecular mass of approximately 24.4 kDa, and BrWRKY12 was exclusively localised in the nucleus. Transcripts of BrWRKY12 were induced by Pcc infection in Brassica. Heterologous expression of BrWRKY12 resulted in reduced susceptibility to Pcc but not to Pseudomonas syringae pv. tomato in Arabidopsis. Defence-associated genes, such as AtPDF1.2 and AtPGIP2, were constitutively expressed in transgenic lines overexpressing BrWRKY12. The expression of AtWKRY12, which is the closest orthologue of BrWRKY12, was down-regulated by Pcc in Arabidopsis. However, the Atwrky12-2 mutants did not show any difference in response to Pcc, pointing to a difference in function of WRKY12 in Brassica and Arabidopsis. Furthermore, BrWRKY12 in Chinese cabbage also exhibited enhanced resistance to bacterial soft rot and increased the expression of defence-associated genes. In summary, BrWRKY12 confers enhanced resistance to Pcc through transcriptional activation of defence-related genes.
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Affiliation(s)
- H S Kim
- National Academy of Agricultural Science, Rural Development Administration, Suwon, South Korea
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Guo M, Nam H, Li R, Xing L, Gao H. TH-E-17A-02: High-Pitch and Sparse-View Helical 4D CT Via Iterative Image Reconstruction Method Based On Tensor Framelet. Med Phys 2014. [DOI: 10.1118/1.4889677] [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: 11/07/2022] Open
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Nam H, Guo M, Lee K, Li R, Xing L, Gao H. SU-E-I-93: Improved Imaging Quality for Multislice Helical CT Via Sparsity Regularized Iterative Image Reconstruction Method Based On Tensor Framelet. Med Phys 2014. [DOI: 10.1118/1.4888043] [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: 11/07/2022] Open
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Kim J, Nam H, An S, Oh Y, Ji Y, Lee R. SU-E-I-62: A New Metal Artifact Reduction Algorithm Using Edge Preserving Smoothing Filter. Med Phys 2013. [DOI: 10.1118/1.4814172] [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: 11/07/2022] Open
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Kim J, Nam H, Park S, Wu H, Ye S. Assessment of Tracking Jaws Based on MLC Aperture to Reduce Normal Tissue Irradiation in VMAT. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.2313] [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: 10/27/2022]
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Park SJ, Shon OJ, Rim JA, Lee JK, Kim JS, Nam H, Kim H. Calixazacrown ethers for copper(II) ion-selective electrode. Talanta 2012; 55:297-304. [PMID: 18968373 DOI: 10.1016/s0039-9140(01)00420-9] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2001] [Revised: 04/19/2001] [Accepted: 04/23/2001] [Indexed: 11/18/2022]
Abstract
Five novel 1,3-alternate calix[4]azacrown ethers having 2-picolyl, 3-picolyl, and benzyl unit on the nitrogen atom were synthesized and used as ionophores for transition metal-selective polymeric membrane electrodes. The electrode based on 2-picolyl armed 1,3-alternate calix [4] azacrown ether exhibited Nernstian response toward copper (II) ion over a concentration range (10(-4.5) M-10(-2.5) M). The detection limit was determined as 10(-5) M in pH 7 and the selectivity coefficients for possible interfering cations were evaluated. Anions in the sample solution strongly affected the electrode response.
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Affiliation(s)
- S J Park
- School of Chemistry and Molecular Engineering, Center for Molecular Catalysis, Seoul National University, Seoul 151-742, South Korea
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Maris P, Vary JP, Navrátil P, Ormand WE, Nam H, Dean DJ. Origin of the anomalous long lifetime of ¹⁴C. Phys Rev Lett 2011; 106:202502. [PMID: 21668224 DOI: 10.1103/physrevlett.106.202502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Indexed: 05/30/2023]
Abstract
We report the microscopic origins of the anomalously suppressed beta decay of ¹⁴C to ¹⁴N using the ab initio no-core shell model with the Hamiltonian from the chiral effective field theory including three-nucleon force terms. The three-nucleon force induces unexpectedly large cancellations within the p shell between contributions to beta decay, which reduce the traditionally large contributions from the nucleon-nucleon interactions by an order of magnitude, leading to the long lifetime of ¹⁴C.
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Affiliation(s)
- P Maris
- Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011-3160, USA
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Ryu JS, Choi C, Yang S, Nam H, Kim H, Lee MH. Development of prognostic biomarker in pathologic stage I NSCLC patients: Protein expressions involving in DNA damage response. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.7578] [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: 11/20/2022] Open
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Dean DJ, Langanke K, Nam H, Nazarewicz W. Pairing reentrance phenomenon in heated rotating nuclei in the shell-model Monte Carlo approach. Phys Rev Lett 2010; 105:212504. [PMID: 21231296 DOI: 10.1103/physrevlett.105.212504] [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] [Received: 01/07/2009] [Revised: 09/21/2010] [Indexed: 05/30/2023]
Abstract
Rotational motion of heated 72Ge is studied within the microscopic shell-model Monte Carlo approach. We investigate the angular momentum alignment and nuclear pairing correlations associated with J^{π} Cooper pairs as a function of the rotational frequency and temperature. The reentrance of pairing correlations with temperature is predicted at high rotational frequencies. It manifests itself through the anomalous behavior of specific heat and level density.
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Affiliation(s)
- D J Dean
- Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA
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Nam H, Huh S, Ju S, Choi J, Kim B. PET/CT Guided Brachytherapy Planning for Cervical Cancer. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.990] [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: 11/26/2022]
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Lee J, Choi D, Huh S, Park W, Nam H, Yang J, Nam S, Lee J. Omitting Postoperative Radiation after Excision for Ductal Carcinoma In Situ of the Breast. Int J Radiat Oncol Biol Phys 2010. [DOI: 10.1016/j.ijrobp.2010.07.578] [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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Nam H, Huh SJ, Park W, Bae DS, Kim BG, Lee JH, Kim CK, Park BK. Prognostic significance of MRI-detected bladder muscle and/or serosal invasion in patients with cervical cancer treated with radiotherapy. Br J Radiol 2010. [DOI: 10.1259/bjr/6646798] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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36
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Nam H, Huh SJ, Park W, Bae DS, Kim BG, Lee JH, Kim CK, Park BK. Prognostic significance of MRI-detected bladder muscle and/or serosal invasion in patients with cervical cancer treated with radiotherapy. Br J Radiol 2010; 83:868-73. [PMID: 20846984 DOI: 10.1259/bjr/66646798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In cervical cancer, the prognostic significance of bladder wall invasion on MRI without pathological evidence of mucosal invasion is not known. From 454 consecutive patients with cervical cancer who were treated with radiation, we reviewed images and analysed the outcome of 92 patients with the Federation of International Gynecology and Obstetrics (FIGO) stage IIIB-IVA. We analysed the patients in three groups, normal, wall (muscle and/or serosal) invasion and mucosal invasion, according to the findings on the MRI. Kaplan-Meier life table analysis and the log-rank test were used to assess the survival rates and differences according to prognostic factors. MRI detected abnormalities in the bladder wall in 42 patients (45.6%): wall invasion in 24 and mucosal invasion in 18. 5 of 18 patients, suspected on MRI to have mucosal invasion, showed no pathological evidence of mucosal invasion. Median follow-up period was 34 months. 3-year cause-specific survival (CSS) in the normal group compared with the wall invasion group was 76.2% vs 71.4% (p = 0.48). 3-year CSS for the wall invasion group compared with the mucosal invasion group was 71.4% vs 54.3% (p = 0.04). Mucosal invasion on MRI (p = 0.03) and concurrent chemoradiotherapy (p = 0.01) was significant for CSS. The prognosis for patients with cervical cancer with evidence of muscle and/or serosal invasion of the bladder on MRI may not differ from that for patients without abnormality on MRI. In patients with the MRI finding of bladder mucosal invasion, further studies should be conducted regarding the role of cystoscopy to determine the need for pathological confirmation.
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Affiliation(s)
- H Nam
- Department of Radiation Oncology, Samsung Medical Centre, Sungkyunkwan University School of Medicine, 135-710, Irwon-dong 50, Gangnam-gu, Seoul, South Korea
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Nam H, Huh S, Lee J. Prognostic Significance of MRI-detected Bladder Muscle and/or Serosal Invasion in Cervical Cancer Patients Treated with Radiotherapy. Int J Radiat Oncol Biol Phys 2009. [DOI: 10.1016/j.ijrobp.2009.07.867] [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: 10/20/2022]
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Lee J, Huh S, Nam H, Ju S, Choi J, Kim B. 8050 Usefulness of FDG-PET/CT guided brachytherapy planning in patients with uterine cervical cancer. EJC Suppl 2009. [DOI: 10.1016/s1359-6349(09)71572-1] [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: 10/20/2022] Open
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Park D, Nam H, Jung T, Jung H, Lee S, Kim D. 69. Clinical, biochemical and electrophysiological study in chronic alcoholism. Clin Neurophysiol 2009. [DOI: 10.1016/j.clinph.2008.10.087] [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: 11/26/2022]
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Park D, Nam H, Kim J, Jeong J, Lee S. 65. Lumbrical and interosseus recording of 700 hands with carpal tunnel syndrome. Clin Neurophysiol 2008. [DOI: 10.1016/j.clinph.2007.11.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Abstract
Current practice in MRI trends towards higher static magnetic field (B/sub 0/) because of the advantage of signal-to-noise ratio (SNR). However at high magnetic fields, the interaction between a coil and a load becomes significant, thus making current distribution on RF coils disturbed and causing transverse magnetic (B/sub 1/) field inhomogeneity. A novel approach to optimize B/sub 1/, field homogeneity is to use a transmit phased array and adjust the amplitudes and phases of the currents on each element independently. However, independent control is difficult to achieve in conventional arrays due to coupling between elements. In addition, the currents are generally load dependent. In this paper we show that a RF current source is an effective method for controlling the current on each element of the transmit phased array, and that the RF current source is much less sensitive to loading and a interelement coupling than a conventional 50Omega matched coil.
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Affiliation(s)
- H Nam
- Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
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Oh D, Lim D, Heo J, Choi S, Choi D, Nam H, Ahn Y, Park W, Huh S. 2157. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.562] [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: 10/24/2022]
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Kang M, Park W, Choi Y, Nam H, Huh S, Ahn Y, Lim D, Park Y, Oh D. 2345. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.754] [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: 11/15/2022]
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Ahn Y, Nam H, Kim Y, Oh D, Ko Y. 2531. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.943] [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: 11/30/2022]
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Nam H, Lim D, Kim S, Sohn T, Noh J, Heo J, Kang W, Park C, Ahn Y, Huh S. 1073. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.338] [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: 10/24/2022]
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Noh J, Park W, Ahn Y, Nam H, Oh D, Chun H, Lee W, Yun S, Kang W, Park Y. 2180. Int J Radiat Oncol Biol Phys 2006. [DOI: 10.1016/j.ijrobp.2006.07.585] [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: 11/16/2022]
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Kim B, Ahn Y, Park W, Park Y, Nam H, Yoon S, Kang W, Chon H. Results of Adjuvant Combined Modality Treatment for Rectal Cancer Patients with Synchronous Liver Metastasis Following Synchronous Rectal and Hepatic Resection. Int J Radiat Oncol Biol Phys 2005. [DOI: 10.1016/j.ijrobp.2005.07.478] [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: 11/28/2022]
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Ahn Y, Kim K, Nam H, Oh D, Park Y, Lim D, Han J, Park J, Kim J, Kim K. P-190 Prognostic factors of N2 positive stage IIIA non-small cell lung cancer treated with preoperative concurrent radiochemotherapy and surgery. Lung Cancer 2005. [DOI: 10.1016/s0169-5002(05)80684-1] [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: 10/25/2022]
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