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Kim HW, Chung DH, Kim SA, Rhee MS. Synergistic cranberry juice combinations with natural-borne antimicrobials for the eradication of uropathogenic Escherichia coli biofilm within a short time. Lett Appl Microbiol 2019; 68:321-328. [PMID: 30801748 DOI: 10.1111/lam.13140] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 01/04/2019] [Revised: 02/16/2019] [Accepted: 02/19/2019] [Indexed: 01/24/2023]
Abstract
Urinary tract infections (UTI), one of the most common diseases in humans, are caused primarily by uropathogenic Escherichia coli (UPEC). Cranberry juice (CB) is a widely known prophylaxis for UTI, but the treatment of CB alone could not effectively eradicate preformed UPEC biofilms. The aim of this study was to develop enforced CB composites within a short time by adding a small quantity of natural borne antimicrobials. UPEC biofilms (initial: 6·0 log CFU per cm2 ), formed on silicone coupons in artificial urine medium, were exposed to CB (4-8%), caprylic acid (CAR; 0·025-0·05%) and thymol (TM; 0·025-0·05%) at 37°C for 1 min. Individual treatment of each compound did not show the significant antibacterial effect on UPEC biofilms (P > 0·05). Otherwise, the survivor counts of biofilms were synergistically reduced with CB containing any of the antimicrobials. For example combined treatment with CB (8%) + CAR (0·05%) + TM (0·05%) resulted in a 6 log reduction in UPEC populations in the biofilm (no detectable bacteria remained) with 4·6 log of synergistic bactericidal effect. The confocal laser scanning microscope images indicated that any composites including TM might result in biofilm detachment from the surface. The present method is cost-effective and more acceptable to consumers as it is based on the synergistic interaction of natural borne antimicrobials. The results of this study could be widely applicable in the functional food, medical and healthcare field. SIGNIFICANCE AND IMPACT OF THE STUDY: Anti-biofilm effect of cranberry juice (CB) has been focused mainly on inhibiting biofilm formation of uropathogenic Escherichia coli (UPEC); however, combined treatment with natural borne antimicrobials derived from coconut oil (caprylic acid) and oregano essential oil (thymol) could synergistically enhance its eradicating activity against biofilms. This study developed novel CB composites showing marked anti-biofilm effects (complete eradication of UPEC biofilms within just 1 min).
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Affiliation(s)
- H W Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea
| | - D H Chung
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea
| | - S A Kim
- Department of Food Science and Engineering, Ewha Womans University, Seoul, Republic of Korea
| | - M S Rhee
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul, Republic of Korea
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Won JK, Keam B, Koh J, Cho HJ, Jeon YK, Kim TM, Lee SH, Lee DS, Kim DW, Chung DH. Concomitant ALK translocation and EGFR mutation in lung cancer: a comparison of direct sequencing and sensitive assays and the impact on responsiveness to tyrosine kinase inhibitor. Ann Oncol 2014; 26:348-54. [PMID: 25403583 DOI: 10.1093/annonc/mdu530] [Citation(s) in RCA: 113] [Impact Index Per Article: 11.3] [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: 12/22/2022] Open
Abstract
BACKGROUND Epidermal growth factor receptor (EGFR) mutation and anaplastic lymphoma kinase (ALK) translocation are considered mutually exclusive in nonsmall-cell lung cancer (NSCLC). However, sporadic cases having concomitant EGFR and ALK alterations have been reported. The present study aimed to assess the prevalence of NSCLCs with concomitant EGFR and ALK alterations using mutation detection methods with different sensitivity and to propose an effective diagnostic and therapeutic strategy. PATIENTS AND METHODS A total of 1458 cases of lung cancer were screened for EGFR and ALK alterations by direct sequencing and flourescence in situ hybridization (FISH), respectively. For the 91 patients identified as having an ALK translocation, peptide nucleic acid (PNA)-clamping real-time PCR, targeted next-generation sequencing (NGS), and mutant-enriched NGS assays were carried out to detect EGFR mutation. RESULTS EGFR mutations and ALK translocations were observed in 42.4% (612/1445) and 6.3% (91/1445) of NSCLCs by direct sequencing and FISH, respectively. Concomitant EGFR and ALK alterations were detected in four cases, which accounted for 4.4% (4/91) of ALK-translocated NSCLCs. Additional analyses for EGFR using PNA real-time PCR and ultra-deep sequencing by NGS, mutant-enriched NGS increased the detection rate of concomitant EGFR and ALK alterations to 8.8% (8/91), 12.1% (11/91), and 15.4% (14/91) of ALK-translocated NSCLCs, respectively. Of the 14 patients, 3 who were treated with gefitinib showed poor response to gefitinib with stable disease in one and progressive disease in two patients. However, eight patients who received ALK inhibitor (crizotinib or ceritinib) showed good response, with response rate of 87.5% (7/8 with partial response) and durable progression-free survival. CONCLUSIONS A portion of NSCLC patients have concomitant EGFR and ALK alterations and the frequency of co-alteration detection increases when sensitive detection methods for EGFR mutation are applied. ALK inhibitors appear to be effective for patients with co-alterations.
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Affiliation(s)
| | - B Keam
- Department of Internal Medicine
| | | | | | | | - T M Kim
- Department of Internal Medicine
| | - S H Lee
- Department of Internal Medicine
| | - D S Lee
- Department of Nuclear Medicine
| | - D W Kim
- Department of Internal Medicine
| | - D H Chung
- Department of Pathology Biomedical Sciences, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
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Kim KY, Shim WB, Kim JS, Chung DH. Development of a Simultaneous Lateral Flow Strip Test for the Rapid and Simple Detection of Deoxynivalenol and Zearalenone. J Food Sci 2014; 79:M2048-55. [DOI: 10.1111/1750-3841.12647] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 08/08/2014] [Indexed: 01/15/2023]
Affiliation(s)
- Kyeong-Yeol Kim
- Div. of Applied Life Science; Graduate School; Gyeongsang National Univ; Jinju Gyeongnam 660-701 Republic of Korea
| | - Won-Bo Shim
- School of Physics and Chemistry; Gwangju Inst. of Science and Technology; Gwangju; 500-712 Republic of Korea
| | - Jeong-Sook Kim
- Inst. of Agriculture and Life Science; Gyeongsang Natl. Univ; Jinju Gyeongnam 660-701 Republic of Korea
| | - Duck-Hwa Chung
- Div. of Applied Life Science; Graduate School; Gyeongsang National Univ; Jinju Gyeongnam 660-701 Republic of Korea
- Inst. of Agriculture and Life Science; Gyeongsang Natl. Univ; Jinju Gyeongnam 660-701 Republic of Korea
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Li T, Kim BB, Shim WB, Byun JY, Chung DH, Shin YB, Kim MG. Homogeneous Fluorescence Resonance Energy Transfer Immunoassay for the Determination of Zearalenone. ANAL LETT 2014. [DOI: 10.1080/00032719.2013.843186] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Shim WB, Mun H, Joung HA, Ofori JA, Chung DH, Kim MG. Chemiluminescence competitive aptamer assay for the detection of aflatoxin B1 in corn samples. Food Control 2014. [DOI: 10.1016/j.foodcont.2013.07.042] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Eun YG, Chung DH, Kim SW, Lee YC, Kim SK, Kwon KH. A Fas-associated via death domain promoter polymorphism (rs10898853, -16C/T) as a risk factor for papillary thyroid cancer. Eur Surg Res 2014; 52:1-7. [PMID: 24434721 DOI: 10.1159/000355878] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Accepted: 09/23/2013] [Indexed: 01/07/2023]
Abstract
PURPOSE To determine whether a Fas-associated via death domain (FADD) promoter single-nucleotide polymorphism (SNP) is associated with susceptibility to papillary thyroid cancer (PTC) and clinicopathological features of PTC. METHODS To identify a possible association with PTC, 94 patients with PTC and 346 healthy controls were recruited. One promoter SNP (rs10898853, -16C/T) was analyzed by direct sequencing. Multiple logistic regression models (co-dominant, dominant, recessive, and log-additive models) were applied, and odds ratios (ORs), 95% confidence intervals (CIs), and p values were calculated. RESULTS The genotype of the promoter SNP (rs10898853) of FADD was found to be significantly associated with PTC in the co-dominant model 2 (T/T vs. C/C; p = 0.002, OR = 2.80, 95% CI = 1.39-5.65), the recessive model (p = 0.003, OR = 2.21, 95% CI = 1.31-3.71), and the log-additive model (p = 0.002, OR = 1.71, 95% CI = 1.20-2.44). Allele frequency analysis showed that the C allele of rs10898853 was significantly associated with an increased risk of PTC (p = 0.002, OR = 1.67, 95% CI = 1.21-2.32). CONCLUSIONS Our results suggest that the FADD promoter polymorphism is associated with susceptibility to PTC.
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Affiliation(s)
- Y G Eun
- Department of Otolaryngology - Head and Neck Surgery, School of Medicine, Kyung Hee University, Seoul, South Korea
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Shim WB, Song JE, Mun H, Chung DH, Kim MG. Rapid colorimetric detection of Salmonella typhimuriumusing a selective filtration technique combined with antibody–magnetic nanoparticle nanocomposites. Anal Bioanal Chem 2013; 406:859-66. [DOI: 10.1007/s00216-013-7497-6] [Citation(s) in RCA: 26] [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: 09/12/2013] [Revised: 10/31/2013] [Accepted: 11/07/2013] [Indexed: 10/25/2022]
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Shim WB, Kim JS, Kim MG, Chung DH. Rapid and sensitive immunochromatographic strip for on-site detection of sulfamethazine in meats and eggs. J Food Sci 2013; 78:M1575-M1581. [PMID: 24024744 DOI: 10.1111/1750-3841.12232] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [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: 03/18/2013] [Accepted: 06/25/2013] [Indexed: 11/28/2022]
Abstract
A rapid immunochromatographic (ICG) strip based on a conjugate of colloidal gold and monoclonal antibody (mAb) was developed for the rapid, sensitive, and on-site detection of sulfamethazine in meat and egg samples. The detection limit of the ICG strip is 2 ng/mL, and the assay can be completed in 10 min. A cross-reactivity test indicated that the ICG strip was highly specific to sulfamethazine with no cross-reaction with sulfonamide compounds and other antibiotics. The results of the recovery test from meat and egg samples spiked with sulfamethazine were in good agreement with those obtained by the indirect competitive enzyme-linked immunosorbent assay. These results demonstrated that the ICG strip can be used as a rapid and qualitative tool for on-site screening of sulfamethazine in meat and egg samples.
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Affiliation(s)
- Won-Bo Shim
- School of Physics and Chemistry, Gwangju Inst. of Science and Technology, Gwangju, 500-712, Republic of Korea
| | - Jeong-Sook Kim
- Inst. of Agriculture and Life Science, Gyeongsang Natl. Univ., Jinju, Gyeongnam 660-701, Republic of Korea
| | - Min-Gon Kim
- School of Physics and Chemistry, Gwangju Inst. of Science and Technology, Gwangju, 500-712, Republic of Korea
| | - Duck-Hwa Chung
- Inst. of Agriculture and Life Science, Gyeongsang Natl. Univ., Jinju, Gyeongnam 660-701, Republic of Korea.,Div. of Applied Life Science, Graduate School, Gyeongsang Natl. Univ., Jinju, Gyeongnam 660-701, Republic of Korea
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Lee JK, Shin JY, Kim S, Lee S, Park C, Kim JY, Koh Y, Keam B, Min HS, Kim TM, Jeon YK, Kim DW, Chung DH, Heo DS, Lee SH, Kim JI. Primary resistance to epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs) in patients with non-small-cell lung cancer harboring TKI-sensitive EGFR mutations: an exploratory study. Ann Oncol 2013; 24:2080-7. [PMID: 23559152 DOI: 10.1093/annonc/mdt127] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- J K Lee
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
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Mtenga AB, Kassim N, Shim WB, Chung DH. Efficiency of fractionated γ-irradiation doses to eliminate vegetative cells and spores of Bacillus cereus from raw rice. Food Sci Biotechnol 2013. [DOI: 10.1007/s10068-013-0117-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Abstract
The objective of this study was to investigate the occurrence of aflatoxins in herbal medicines distributed in South Korea. A total of 700 herbal medicine samples (10 samples each for 70 types of herbal medicine) were analyzed by an enzyme-linked immunosorbent assay (ELISA) for aflatoxin B(1) (AFB(1)), and levels of total aflatoxins were quantified and confirmed by liquid chromatography combined with tandem mass spectrometry (LC-MS/MS). The levels of recovery of the methods were 84.30 to 102.68% (ELISA for AFB(1)) and 72.17 to 90.92% (LC-MS/MS for total aflatoxins). Fifty-eight (8.29%) of 700 samples were AFB(1) positive by ELISA, and 17 (2.43%) of them were finally confirmed as positive for total aflatoxins by LC-MS/MS. Total aflatoxin levels in the herbal medicines were from 4.51 to 108.42 μg/kg. Among the 17 samples, the AFB(1) content of 6 samples (11.95 to 73.27 μg/kg) and the total aflatoxin content of 10 (12.12 to 108.42 μg/kg) samples exceeded the legal limits set by the Korea Food and Drug Administration for AFB(1) (10 μg/kg) and by the European Commission for total aflatoxins (10 μg/kg), respectively. These results demonstrate the risk to consumers of herbal medicine contamination by aflatoxins and encourage further studies to investigate the transfer rate of mycotoxins to decoction, which is the final product for consumption.
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Affiliation(s)
- Won-Bo Shim
- Department of Nutrition, Florida State University, Tallahassee, FL 32312, USA
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Choi CM, Yang SC, Jo HJ, Song SY, Jeon YJ, Jang TW, Kim DJ, Jang SH, Yang SH, Kim YD, Lee KH, Jang SJ, Kim YT, Kim DK, Chung DH, Kim L, Nam HS, Cho JH, Kim HJ, Ryu JS. Proteins involved in DNA damage response pathways and survival of stage I non-small-cell lung cancer patients. Ann Oncol 2012; 23:2088-2093. [PMID: 22317771 DOI: 10.1093/annonc/mdr606] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Biological complexity leads to significant variation in the survival of patients with stage I non-small-cell lung cancer (NSCLC). DNA damage response (DDR) pathways play a critical role in maintaining genomic stability and in the progression of NSCLC. Therefore, the development of a prognostic biomarker focusing on DDR pathways is an intriguing issue. PATIENTS AND METHODS Expression of several proteins (ATM, ATMpS1981, γH2AX, 53BP1, 53BP1pS25, Chk2, Chk2pT68, MDC1, MDC1pS964, BRCA1pS1423, and ERCC1) and overall survival were investigated in 889 pathological stage I NSCLC patients. RESULTS Low expression of BRCA1pS1423 or ERCC1 was significantly associated with worse survival in the whole cohort of patients. Analysis performed based on histology revealed that low expression of γH2AX, Chk2pT68, or ERCC1 was a poor prognostic factor in squamous cell carcinoma patients [adjusted hazard ratio (aHR), Cox P: 1.544, 0.012 for γH2AX; 1.624, 0.010 for Chk2pT68; 1.569, 0.011 for ERCC1]. The analysis of the interaction between two proteins showed that this effect was more pronounced in squamous cell carcinoma patients. However, these effects were not detected in adenocarcinoma patients. CONCLUSIONS The proteins involved in DDR pathways exhibited differential expression between squamous cell carcinoma and adenocarcinoma and were important determinants of survival in stage I squamous cell carcinoma patients.
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Affiliation(s)
- C M Choi
- Department of Pulmonary and Critical Care Medicine, Asan Medical Center, College of Medicine, University of Ulsan, Seoul
| | - S C Yang
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University College of Medicine, Seoul
| | - H J Jo
- Department of Pathology, College of Medicine, Wonkwang University, Iksan
| | - S Y Song
- Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hwasun Hospital, Hwasun-gun
| | - Y J Jeon
- Department of Internal Medicine, School of Medicine, Keimyung University, Daegu
| | - T W Jang
- Department of Internal Medicine, College of Medicine, Kosin University, Busan
| | - D J Kim
- Division of Respiratory and Allergy Medicine, Soonchunhyang University Hospital, College of Medicine, Bucheon
| | - S H Jang
- Division of Pulmonary, Allergy & Critical Care Medicine, Hallym University Sacred Heart Hospital, College of Medicine, Hallym University, Anyang
| | - S H Yang
- Department of Internal Medicine, Wonkwang University Hospital, Iksan
| | - Y D Kim
- Department of Thoracic Surgery, School of Medicine, Pusan National University, Busan
| | - K H Lee
- Department of Internal Medicine, Yeungnam University School of Medicine, Daegu
| | - S J Jang
- Department of Pathology, Asan Medical Center, College of Medicine, University of Ulsan, Seoul
| | - Y T Kim
- Department of Thoracic and Cardiovascular Surgery, Seoul National University College of Medicine, Seoul
| | - D K Kim
- Department of Thoracic and Cardiovascular Surgery, Asan Medical Center, College of Medicine, University of Ulsan, Seoul
| | - D H Chung
- Department of Pathology, Seoul National University College of Medicine, Seoul
| | | | - H S Nam
- Pulmonary Division, Department of Internal Medicine, Inha University Hospital, Incheon, Korea
| | - J H Cho
- Pulmonary Division, Department of Internal Medicine, Inha University Hospital, Incheon, Korea
| | - H J Kim
- Pulmonary Division, Department of Internal Medicine, Inha University Hospital, Incheon, Korea
| | - J S Ryu
- Pulmonary Division, Department of Internal Medicine, Inha University Hospital, Incheon, Korea.
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Ahn JW, Jeon YH, Hwang JI, Kim HY, Kim JH, Chung DH, Kim JE. Monitoring of Pesticide Residues and Risk Assessment for Fruit Vegetables and Root Vegetables of Environment-friendly Certified and General Agricultural Products. ACTA ACUST UNITED AC 2012. [DOI: 10.5338/kjea.2012.31.2.164] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Ha GH, Kim HS, Go H, Lee H, Seimiya H, Chung DH, Lee CW. Tankyrase-1 function at telomeres and during mitosis is regulated by Polo-like kinase-1-mediated phosphorylation. Cell Death Differ 2012; 19:321-32. [PMID: 21818122 PMCID: PMC3263489 DOI: 10.1038/cdd.2011.101] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [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: 01/18/2011] [Revised: 06/13/2011] [Accepted: 06/22/2011] [Indexed: 01/21/2023] Open
Abstract
Telomere length is critical for chromosome stability that affects cell proliferation and survival. Telomere elongation by telomerase is inhibited by the telomeric protein, TRF1. Tankyrase-1 (TNKS1) poly(ADP-ribosyl)ates TRF1 and releases TRF1 from telomeres, thereby allowing access of telomerase to the telomeres. TNKS1-mediated poly(ADP-ribosyl)ation also appears to be crucial for regulating the mitotic cell cycle. In searching for proteins that interact with polo-like kinase-1 (Plk1) by using complex proteomics, we identified TNKS1 as a novel Plk1-binding protein. Here, we report that Plk1 forms a complex with TNKS1 in vitro and in vivo, and phosphorylates TNKS1. Phosphorylation of TNKS1 by Plk1 appears to increase TNKS1 stability and telomeric poly(ADP-ribose) polymerase (PARP) activity. By contrast, targeted inhibition of Plk1 or mutation of phosphorylation sites decreased the stability and PARP activity of TNKS1, leading to distort mitotic spindle-pole assembly and telomeric ends. Taken together, our results provide evidence of a novel molecular mechanism in which phosphorylation of TNKS1 by Plk1 may help regulate mitotic spindle assembly and promote telomeric chromatin maintenance.
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Affiliation(s)
- G-H Ha
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 440-746, Republic of Korea
- Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Republic of Korea
| | - H-S Kim
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 440-746, Republic of Korea
- Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Republic of Korea
| | - H Go
- Department of Pathology, Seoul National University College of Medicine, Seoul 110-799, Republic of Korea
| | - H Lee
- Division of Cancer Biology, Research Institute, National Cancer Center, Goyang 411-764, Republic of Korea
| | - H Seimiya
- Cancer Chemotherapy Center, Japanese Foundation for Cancer Research, Tokyo 135-8550, Japan
| | - D H Chung
- Department of Pathology, Seoul National University College of Medicine, Seoul 110-799, Republic of Korea
| | - C-W Lee
- Department of Molecular Cell Biology, Sungkyunkwan University School of Medicine, Suwon 440-746, Republic of Korea
- Center for Molecular Medicine, Samsung Biomedical Research Institute, Sungkyunkwan University School of Medicine, Suwon 440-746, Republic of Korea
- Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University School of Medicine, Suwon 440-746, Republic of Korea
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Mtenga AB, Kassim N, Lee WG, Heo RW, Shim WB, Yoon Y, Chung DH. Effect of Low Dose γ-Irradiation on the Fate and Cell Envelope of Bacillus cereus, Escherichia coli, and Salmonella Typhimurium. Korean J Food Sci Anim Resour 2011. [DOI: 10.5851/kosfa.2011.31.6.843] [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: 12/13/2022] Open
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Kim HY, Jeon YH, Hwang JI, Kim JH, Ahn JW, Chung DH, Kim JE. Monitoring of Pesticide Residues and Risk Assessment for Cereals and Leafy Vegetables of Certificated and General Agricultural Products. ACTA ACUST UNITED AC 2011. [DOI: 10.5338/kjea.2011.30.4.440] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Reiter EV, Cichna-Markl M, Tansakul N, Shim WB, Chung DH, Zentek J, Razzazi-Fazeli E. Sol–gel immunoaffinity chromatography for the clean up of ochratoxin A contaminated grains. J Chromatogr A 2011; 1218:7627-33. [DOI: 10.1016/j.chroma.2011.07.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2011] [Revised: 07/04/2011] [Accepted: 07/08/2011] [Indexed: 11/24/2022]
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Kim SR, Lee JY, Lee SH, Ryu KY, Park KH, Kim BS, Yoon YH, Shim WB, Kim KY, Ha SD, Yun JC, Chung DH. Profiles of Toxin Genes and Antibiotic Susceptibility of Bacillus cereus Isolated from Perilla Leaf and Cultivation Areas. ACTA ACUST UNITED AC 2011. [DOI: 10.9721/kjfst.2011.43.2.134] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Reiter EV, Cichna-Markl M, Chung DH, Shim WB, Zentek J, Razzazi-Fazeli E. Determination of ochratoxin A in grains by immuno-ultrafiltration and HPLC-fluorescence detection after postcolumn derivatisation in an electrochemical cell. Anal Bioanal Chem 2011; 400:2615-22. [DOI: 10.1007/s00216-011-4942-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2011] [Revised: 03/20/2011] [Accepted: 03/21/2011] [Indexed: 10/18/2022]
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Yoon Y, Kim K, Nam M, Shim WB, Ryu JG, Kim DH, You OJ, Chung DH. Microbiological Assessment in Strawberry Production and Recommendations to Establish a Good Agricultural Practice System. Foodborne Pathog Dis 2010; 7:1511-9. [DOI: 10.1089/fpd.2010.0611] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Yohan Yoon
- Department of Food and Nutrition, Sookmyung Women's University, Seoul, South Korea
| | - Kyeongyeol Kim
- Division of Applied Life Sciences, Graduate School of Gyeongsang National University, Jinju, South Korea
| | - Minji Nam
- Division of Applied Life Sciences, Graduate School of Gyeongsang National University, Jinju, South Korea
| | - Won-Bo Shim
- Division of Applied Life Sciences, Graduate School of Gyeongsang National University, Jinju, South Korea
| | - Jae-Gee Ryu
- Division of Microbial Safety, National Academy of Agricultural Science, Rural Development Administration, Suwon, South Korea
| | - Doo-Ho Kim
- Division of Microbial Safety, National Academy of Agricultural Science, Rural Development Administration, Suwon, South Korea
| | - Oh-Jong You
- Division of Agromaterial Management, National Academy of Agricultural Science, Rural Development Administration, Suwon, South Korea
| | - Duck-Hwa Chung
- Division of Applied Life Sciences, Graduate School of Gyeongsang National University, Jinju, South Korea
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Ahn J, Kim D, Jang HS, Kim Y, Shim WB, Chung DH. Occurrence of ochratoxin A in Korean red paprika and factors to be considered in prevention strategy. Mycotoxin Res 2010; 26:279-86. [PMID: 23605491 DOI: 10.1007/s12550-010-0067-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2010] [Revised: 07/05/2010] [Accepted: 08/05/2010] [Indexed: 10/19/2022]
Abstract
A large amount-260,000 tons-of red paprika is consumed annually in Korea, where the people prefer hot and pungent to sweet foods. Concern has recently grown among consumers over contamination of paprika powder by mycotoxins; contamination can occur at any stage from pre-harvest to drying, storage, grinding, and eventually transport to the retail market. This study had dual aims: to investigate the current level of contamination of hot peppers by ochratoxin A and to identify the critical control points in the food chain. We measured the ochratoxin A (OTA) content of 200 samples from various sources including supermarkets, an online shopping mall, small stakeholder mills, Hazard Analysis and Critical Control Points (HACCP)-implemented factories, and an import company. Mycotoxin was determined using immunoaffinity column cleanup/HPLC quantification as well as strong anion exchange cleanup/stable isotope dilution assay. Monitoring revealed that approximately 30% of red paprika samples were OTA-positive, indicating a need to establish a maximum level for regulation. We selected two model factories that had adopted HACCP in different ways, and compared data in order to develop guidelines for alleviation of mitigation of the mycotoxin contamination.
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Affiliation(s)
- Jongsung Ahn
- National Agricultural Products Quality Management Service, Seoul, 150-804, Korea,
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22
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Abstract
Birch's law arises in the physics of solids as a linear approximation, in a certain range of density, of a power law. For a change of chemical composition within the same crystal structure, the velocity-density relation is constant with a slope of nearly -0.5 in the first-order approximation.
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Yang ZY, Shim WB, Kim KY, Chung DH. Rapid detection of enterotoxigenic Clostridium perfringens in meat samples using immunomagnetic separation polymerase chain reaction (IMS-PCR). J Agric Food Chem 2010; 58:7135-7140. [PMID: 20507064 DOI: 10.1021/jf1009654] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Rapid detection of enterotoxigenic Clostridium perfringens in meat samples was accomplished with an immunomagnetic separation polymerase chain reaction (IMS-PCR). First, a monoclonal antibody (mAb) specific to C. perfringens was generated. The antibody showed strong binding to C. perfringens and no binding to non- Clostridia bacteria, except a weak cross-reaction to Staphylococcus aureus based on the enzyme-linked immunosorbent assay (ELISA). Then, magnetic beads were coated with the mAb, and the IMS-PCR system was developed. With the optimized conditions, the IMS-PCR assay was capable of detecting as few as 10 colony forming units (CFU)/g of C. perfringens cells in the meat sample within 10 h. Of the 116 collected samples (26 chicken samples, 20 beef samples, 30 pork samples, 20 fish samples, and 20 processed meat samples) examined with IMS-PCR, 36 (31%) were C. perfringens -positive samples and 2 (1.7%) were enterotoxigenic C. perfringens -positive samples. The IMS-PCR results gave a good agreement with the results obtained by conventional culture methods. In comparison to conventional culture methods, the IMS-PCR is a rapid and specific method and has potential use as a screening tool for enterotoxigenic C. perfringens in food samples.
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Affiliation(s)
- Zheng-You Yang
- Department of Microbiology, College of Life Science, Key Laboratory for Agriculture Microbiology, Shandong Agricultural University, Taian, China
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Koh YI, Shim JU, Lee JH, Chung IJ, Min JJ, Rhee JH, Lee HC, Chung DH, Wi JO. Natural killer T cells are dispensable in the development of allergen-induced airway hyperresponsiveness, inflammation and remodelling in a mouse model of chronic asthma. Clin Exp Immunol 2010; 161:159-70. [PMID: 20456411 DOI: 10.1111/j.1365-2249.2010.04151.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Natural killer T (NK T) cells have been shown to play an essential role in the development of allergen-induced airway hyperresponsiveness (AHR) and/or airway inflammation in mouse models of acute asthma. Recently, NK T cells have been reported to be required for the development of AHR in a virus induced chronic asthma model. We investigated whether NK T cells were required for the development of allergen-induced AHR, airway inflammation and airway remodelling in a mouse model of chronic asthma. CD1d-/- mice that lack NK T cells were used for the experiments. In the chronic model, AHR, eosinophilic inflammation, remodelling characteristics including mucus metaplasia, subepithelial fibrosis and increased mass of the airway smooth muscle, T helper type 2 (Th2) immune response and immunoglobulin (Ig)E production were equally increased in both CD1d-/- mice and wild-type mice. However, in the acute model, AHR, eosinophilic inflammation, Th2 immune response and IgE production were significantly decreased in the CD1d-/- mice compared to wild-type. CD1d-dependent NK T cells may not be required for the development of allergen-induced AHR, eosinophilic airway inflammation and airway remodelling in chronic asthma model, although they play a role in the development of AHR and eosinophilic inflammation in acute asthma model.
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Affiliation(s)
- Y-I Koh
- Department of Allergy, Asthma and Clinical Immunology and Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju, South Korea.
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Cho MS, Kim K, Seo E, Kassim N, Mtenga AB, Shim WB, Lee SH, Chung DH. Occurrence of patulin in various fruit juices from South Korea: An exposure assessment. Food Sci Biotechnol 2010. [DOI: 10.1007/s10068-010-0001-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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26
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Shim WB, Kim KY, Chung DH. Development and validation of a gold nanoparticle immunochromatographic assay (ICG) for the detection of zearalenone. J Agric Food Chem 2009; 57:4035-4041. [PMID: 19348422 DOI: 10.1021/jf900075h] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [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
A monoclonal antibody (mAb)-based gold nanoparticle immunochromatographic assay (ICG) for zearalenone detection was developed, optimized, and validated. The detection limits of ICG optimized with appropriate amounts of zearalenone-bovine serum albumin and gold nanoparticle-mAb to zearalenone were 2.5 ng/mL and 30 μg/kg for the standard solution and spike sample, respectively, and a weak cross-reaction for α-zearalenol and β-zearalenol was observed. The assay required only 15 min to obtain results and one step to perform the assay. In validation, the results obtained from spiked corn (10, 20, 30, 50, and 100 μg/kg) and naturally contaminated corn samples by the ICG were in good agreement with those obtained by direct competitive enzyme-linked immunosorbent assay (DC-ELISA) and high-performance liquid chromatography (HPLC). Therefore, the results obtained in this study could be used as basic research for the development of zearalenone-ICG, and the ICG developed could be a useful on-site screening tool for the rapid detection of zearalenone in corn without special instrumentation.
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Affiliation(s)
- Won-Bo Shim
- Division of Applied Life Science (BK 21 program), Graduate School, Institute of Agriculture and Life Science, Gyeongsang National University, Chinju, Gyeongnam 660-701, Korea
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Reiter EV, Cichna-Markl M, Chung DH, Zentek J, Razzazi-Fazeli E. Immuno-ultrafiltration as a new strategy in sample clean-up of aflatoxins. J Sep Sci 2009; 32:1729-39. [DOI: 10.1002/jssc.200900123] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Shim WB, Yakovleva ME, Kim KY, Nam BR, Vylegzhanina ES, Komarov AA, Eremin SA, Chung DH. Development of fluorescence polarization immunoassay for the rapid detection of 6-chloronicotinic acid: main metabolite of neonicotinoid insecticides. J Agric Food Chem 2009; 57:791-796. [PMID: 19140717 DOI: 10.1021/jf802647v] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [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
A fluorescence polarization immunoassay (FPIA) for the quantitative determination of 6-chloronicotinic acid (6-CNA) using polyclonal antibody was developed. The 6-CNA-protein (bovine serum albumin and soybean trypsin inhibitor) conjugates and fluorescein-labeled 6-CNA derivative (tracer) were prepared and used as the immunogens and tracer, respectively. The synthesized tracer was purified by thin layer chromatography (TLC) and showed a good binding to antiserum (73/5) which was obtained from the immunized rabbit (No. 73) with 6-CNA-BSA conjugate. The detection limit (10% inhibition) of FPIA was 4 microg/mL, and IC(50) value was 32 microg/mL. The FPIA showed a cross-reaction for 5-amino-2-chloropyridine (60%), but no cross-reaction for other pesticides was observed. Recoveries for spiked apple, urine, soil, and water samples (5, 50, and 500 ppm) averaging between 78.6 +/- 8.8 and 114 +/- 18% were reasonable and in good agreement with the amounts spiked. Although the developed FPIA possesses low sensitivity, this assay is more simple and quick than other analytical methods, such as high performance liquid chromatography and gas chromatography. Thus, the developed FPIA method could be a useful tool for express screening 6-CNA in agricultural, environmental, and biological samples.
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Affiliation(s)
- Won-Bo Shim
- Division of Applied Life Science, Graduate School of Gyeongsang National University, Chinju, Gyeongnam, Korea
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29
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Seo E, Yoon Y, Kim K, Shim WB, Kuzmina N, Oh KS, Lee JO, Kim DS, Suh J, Lee SH, Chung KH, Chung DH. Fumonisins B1 and B2 in agricultural products consumed in South Korea: an exposure assessment. J Food Prot 2009; 72:436-40. [PMID: 19350995 DOI: 10.4315/0362-028x-72.2.436] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
To survey fumonisins B1 (FB1) and B2 (FB2) in agricultural products consumed in South Korea and provide an exposure assessment, ground samples were extracted (80% MeOH), filtered (0.2 microm), and cleaned up. After evaporation, dry residues were reconstituted in 50% MeOH, and a 50-micro1 aliquot of this sample was mixed with 200 micro1 of o-phthaldialdehyde for derivatization. The derivatives were analyzed with a high-performance liquid chromatography system equipped with a fluorescence detector. For validation of the detection procedure, linearity, accuracy, precision, detection limit, and quantification limit were determined. The validated detection method was then used to survey fumonisins in white rice, brown rice, barley, barley tea, beer, wheat flour, millet, dried corn, corn flour, corn tea, canned corn, popcorn, and breakfast cereal. Retention times for FB1 and FB2 standards were 7 and 18 min, respectively. Linearity (R2 = 0.99995 to 0.99998), accuracy (81.47 to 108.83%), precision (2.35 to 5.77), detection limit (25 ng/g or ng/ml), and quantification limit (37 ng/g or ng/ml) indicated that this procedure is capable of quantifying fumonisins in agricultural products. Only FB1-positive samples (5.12%, three dried corn samples and five corn flour samples) were found at 90.89 to 439.67 ng/g. According the survey results, an estimated daily intake of FB1 and FB2 in Korea was 0.087 ng/kg of body weight per day. These results indicate that continuous monitoring of these mycotoxins is necessary to establish appropriate risk assessment, and the maximum tolerable daily intake of fumonisins in Korea is lower than the 2 microg/kg set by the Joint Food and Agriculture Organization-World Health Organization Expert Committee.
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Affiliation(s)
- Eunkyoung Seo
- Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju, Gyeongnam 660-701, Korea
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Shim WB, Dzantiev BB, Eremin SA, Chung DH. One-step simultaneous immunochromatographic strip test for multianalysis of ochratoxin a and zearalenone. J Microbiol Biotechnol 2009; 19:83-92. [PMID: 19190413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Individual immunochromatographic assays (ICG) for ochratoxin A (OTA) and zearalenone (ZEA) were optimized and used in the development of a one-step simultaneous immunochromatographic assay (OS-ICG) for the rapid multianalysis of two mycotoxins in corn samples. The nitrocellulose membrane of the OS-ICG was treated with OTA-bovine serum albumin (BSA), ZEA-ovalbumin (OVA), and anti-mouse IgG in the OTA test, ZEA test, and control zones, respectively. Monoclonal antibody-gold conjugates (OTA3 MAb-gold and ZEA2C5 MAb-gold) were sprayed onto the conjugate pad. The visual detection limits were 2.5 and 5 ng/ml for OTA and ZEA, resepectively, and the results were obtained within 15 min after starting the analysis. An efficient, simple, and rapid extraction method using 30% MeOH/PBS was established and validated by analyzing the corn samples spiked with OTA/ZEA mixtures (0/0, 5/10, 10/20, and 20/30 microg/kg). The cut-off values of the OS-ICG for the spiked corn were 5 and 10 microg/kg for OTA and ZEA, respectively. Natural corn samples were analyzed by OS-ICG, direct competitive enzyme-linked immunosorbent assay (DC-ELISA), and HPLC. Results of the OS-ICG were in good agreement with those obtained by DC-ELISA and HPLC. The developed OS-ICG offers a rapid, easy-to-use, and portable analytical system and can be used as a convenient qualitative tool for the on-site simultaneous determination of OTA and ZEA in cereals, food, and agricultural products in one analytical cycle.
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Affiliation(s)
- Won-Bo Shim
- Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University, Chinju, Korea
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Gachok IV, Bondarenko AP, De Saeger S, Lobeau M, Van Peteghem C, Shim WB, Chung DH, Eremin SA. Multi-detection of mycotoxins by fluorescence polarization immunoassay. Toxicol Lett 2008. [DOI: 10.1016/j.toxlet.2008.06.688] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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33
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Kim HJ, Chung DH, Kim MJ, Jang JH, Kim YW, Han SK, Shim YS, Yim JJ. Decreased phosphorylation of STAT-1, STAT-4 and cytokine release in MDR-TB patients with primary resistance. Int J Tuberc Lung Dis 2008; 12:1071-1076. [PMID: 18713507] [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: 05/26/2023] Open
Abstract
SETTING We recently showed that treatment failure rate was higher among multidrug-resistant tuberculosis (MDR-TB) patients without a previous history of tuberculosis (TB) treatment, or so-called 'primary resistance'. OBJECTIVE To investigate the phosphorylation levels of signal transducers and activators of transcription-1 (STAT-1) and STAT-4 and the subsequent cytokine release as a possible cause of a poor prognosis in MDR-TB patients with primary resistance. DESIGN Ten patients with successfully treated pulmonary TB without resistance, 12 MDR-TB patients with acquired resistance and 10 MDR-TB patients with primary resistance were enrolled. After 24 h stimulation of peripheral blood mononuclear cells (PBMC) with interferon-gamma (IFN-gamma), interleukin-12 (IL-12), purified protein derivative (PPD), or lysate of Mycobacterium tuberculosis, flow cytometric analysis of intracellular pSTAT-1 and pSTAT-4 were performed and secretion of IFN-gamma, IL-12p40 and tumour necrosis factor-alpha (TNF-alpha) was measured in culture supernatant. RESULTS The mean fluorescent intensities of pSTAT-1 and pSTAT-4 in PBMC of MDR-TB patients with primary resistance decreased on stimulation of IFN-gamma, PPD or lysate of M. tuberculosis when compared with patients with acquired resistance. In addition, secretion of IFN-gamma, IL-12p40 and TNF-alpha in these patients decreased on various stimuli. CONCLUSION Decreased phosphorylation of STAT-1, STAT-4, and of subsequent cytokine release, might be associated with a poor prognosis in MDR-TB patients with primary resistance.
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MESH Headings
- Adolescent
- Adult
- Cytokines/metabolism
- Enzyme-Linked Immunosorbent Assay
- Female
- Flow Cytometry
- Humans
- Leukocytes, Mononuclear/chemistry
- Leukocytes, Mononuclear/immunology
- Male
- Middle Aged
- Mycobacterium tuberculosis/immunology
- Phosphorylation
- STAT1 Transcription Factor/metabolism
- STAT4 Transcription Factor/metabolism
- Tuberculosis, Multidrug-Resistant/blood
- Tuberculosis, Multidrug-Resistant/drug therapy
- Tuberculosis, Multidrug-Resistant/immunology
- Tuberculosis, Multidrug-Resistant/metabolism
- Tuberculosis, Pulmonary/drug therapy
- Tuberculosis, Pulmonary/immunology
- Tuberculosis, Pulmonary/metabolism
- Tuberculosis, Pulmonary/microbiology
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Affiliation(s)
- H J Kim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine and Lung Institute, Seoul National University College of Medicine, Seoul, Republic of Korea
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Shim WB, Choi JG, Kim JY, Yang ZY, Lee KH, Kim MG, Ha SD, Kim KS, Kim KY, Kim CH, Eremin SA, Chung DH. Enhanced rapidity for qualitative detection of Listeria monocytogenes using an enzyme-linked immunosorbent assay and immunochromatography strip test combined with immunomagnetic bead separation. J Food Prot 2008; 71:781-9. [PMID: 18468033 DOI: 10.4315/0362-028x-71.4.781] [Citation(s) in RCA: 30] [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: 11/11/2022]
Abstract
An enzyme-linked immunosorbent assay (ELISA), immunochromatography (ICG) strip test, and immunomagnetic bead separation (IMBS) system based on a monoclonal antibody were individually developed for the detection and isolation of Listeria monocytogenes in meat samples. The three methods showed a strong reaction with Listeria species and a weak reaction with Staphylococcus aureus. To increase the rapidity of L. monocytogenes detection, combinations of the ELISA and ICG strip test with the IMBS system (ELISA-IMBS and ICG-IMBS) were investigated. In comparative analyses of artificially inoculated meat and samples of processed meat, the ELISA and ICG strip test required 24 h of enrichment time to detect the inoculated meat samples with > or =1 X 10(2) CFU/10 g, whereas the ELISA-IMBS and ICG-IMBS required only 14 h of enrichment. Analyses of naturally contaminated meat samples (30 pork samples, 20 beef samples, 26 chicken samples, 20 fish samples, and 20 processed meat samples) performed by ELISA-IMBS, ICG-IMBS, and API kit produced similar results. The ELISA-IMBS and ICG-IMBS provide a more rapid assay than the individual ELISA and the ICG strip test and are appropriate for rapid and qualitative detection of L. monocytogenes (or Listeria species) in meat samples. With the ICG-IMBS, L. monocytogenes could be detected in meat samples within 15 h and the method has potential as a rapid, cost-effective on-site screening tool for the detection of L. monocytogenes in food samples and agricultural products at a minimum detection level of approximately 100 CFU/10 g.
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Affiliation(s)
- Won-Bo Shim
- Division of Applied Life Science (Brain Korea 21 program), Graduate School of Gyeongsang National University, Chinju, Gyeongnam 660-701, Korea
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36
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Kim DW, Min HS, Lee KH, Kim YJ, Oh DY, Jeon YK, Lee SH, Im SA, Chung DH, Kim YT, Kim TY, Bang YJ, Sung SW, Kim JH, Heo DS. High tumour islet macrophage infiltration correlates with improved patient survival but not with EGFR mutations, gene copy number or protein expression in resected non-small cell lung cancer. Br J Cancer 2008; 98:1118-24. [PMID: 18283317 PMCID: PMC2275476 DOI: 10.1038/sj.bjc.6604256] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [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] [Subscribe] [Scholar Register] [Received: 07/26/2007] [Revised: 01/02/2008] [Accepted: 01/18/2008] [Indexed: 11/09/2022] Open
Abstract
The purpose of this study was to investigate the prognostic value of tumour-associated macrophages with a focus on micro-anatomical localisation and determine whether molecular changes of the epidermal growth factor receptor (EGFR) are related to macrophage infiltration in resected non-small cell lung cancer (NSCLC). One hundred and forty-four patients were included in this study. Immunohistochemistry was used to identify CD68+ macrophages in the tumour islet and surrounding stroma. Epidermal growth factor receptor mutations were studied by direct sequencing. The EGFR gene copy number and protein expression were analysed by fluorescence in situ hybridisation and immunohistochemistry. Patients with a high tumour islet macrophage density survived longer than did the patient with a low tumour islet macrophage density (5-year overall survival rate was 63.9 vs 38.9%, P=0.0002). A multivariate Cox proportional hazard analysis revealed that the tumour islet macrophage count was an independent prognostic factor for survival (hazard ratio 0.471, 95% confidence interval 0.300-0.740). However, EGFR mutations, gene copy number, and protein expression were not related to the macrophage infiltration. In conclusion, tumour islet macrophage infiltration was identified as a strong favourable independent prognostic marker for survival but not correlated with the molecular changes of the EGFR in patients with resected NSCLC.
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Affiliation(s)
- D-W Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - H S Min
- Department of Pathology, Seoul National University Hospital, Seoul, Korea
| | - K-H Lee
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - Y J Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - D-Y Oh
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Y K Jeon
- Department of Pathology, Seoul National University Hospital, Seoul, Korea
| | - S-H Lee
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - S-A Im
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - D H Chung
- Department of Pathology, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Y T Kim
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul, Korea
| | - T-Y Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Y-J Bang
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - S W Sung
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul, Korea
| | - J H Kim
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul, Korea
| | - D S Heo
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
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Ok HE, Kim HJ, Shim WB, Lee H, Bae DH, Chung DH, Chun HS. Natural occurrence of aflatoxin B1 in marketed foods and risk estimates of dietary exposure in Koreans. J Food Prot 2007; 70:2824-8. [PMID: 18095437 DOI: 10.4315/0362-028x-70.12.2824] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Aflatoxin B1 (AFB1) is an unavoidable food contaminant. To evaluate the potential health risk of AFB1 to Koreans posed by food consumption, we determined the natural occurrence of AFB1 in food and estimated the excess risk for liver cancer through dietary exposure to AFB1. A total of 694 food samples collected from six different regions of South Korea were analyzed for their AFB, content. One hundred four of the 694 samples were found to give positive enzyme-linked immunosorbent assay (ELISA) readings for AFB1 and were further investigated with high-performance liquid chromatography. Thirty-two samples, including 2 maize samples, 3 soybean products, 20 peanut samples, nut samples, and their products, and 7 spices, were found to be contaminated with AFB1 (4.6% incidence), up to 48.6 microg kg(-1). The level of AFB1 contamination in 28 of the 32 food products was below 10 microg kg(-1), which is the legal tolerance limit in Korea. From data on daily food consumption, the exposure dose of AFB1 was estimated to be 6.42 x 10(-7) mg kg(-1) body weight (bw) day(-1). The major contributors to the dietary intake of AFB1 were soybean paste and soy sauce, which composed 91% of the total exposure to AFB1. The excess risk of liver cancer for those exposed to AFB1 through food intake was estimated to be 5.78 x 10(-6) for hepatitis B-negative individuals and 1.48 x 10(-4) for hepatitis B-positive individuals. These results suggest that special consideration is required to reduce the intake of AFB1 in hepatitis B-positive individuals.
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Affiliation(s)
- Hyun Ee Ok
- Food Safety Research Division, Korea Food Research Institute, San 516, Baekhyun, Bundang, Sungnam 463-746, South Korea
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Shim WB, Yang ZY, Kim JS, Kim JY, Kang SJ, Woo GJ, Chung YC, Eremin SA, Chung DH. Development of immunochromatography strip-test using nanocolloidal gold-antibody probe for the rapid detection of aflatoxin B1 in grain and feed samples. J Microbiol Biotechnol 2007; 17:1629-1637. [PMID: 18156778] [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
An immunochromatography (ICG) strip test using a nanocolloidal gold-antibody probe was developed and optimized for the rapid detection of aflatoxin B1 (AFB1). A monoclonal antibody specific to AFB1 was produced from the cloned hybridoma cell (AF78), coupled with nanocolloidal gold, and distributed on the conjugate pad of the ICG strip test. The visual detection limit of the ICG strip test was 0.5 ng/ml, and this method showed a cross-reaction to aflatoxin B2, G1, and G2. In total, 172 grain and feed samples were collected and analyzed by both the ICG strip test and HPLC. The results of the ICG strip test showed a good agreement with those obtained by HPLC. These results indicated that the ICG strip test has a potential use as a rapid and cost-effective screening tool for the determination of AFB1 in real samples and could be applied to the preliminary screening of mycotoxin in food and agricultural products, generating results within 15 min without complicated steps.
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Affiliation(s)
- Won-Bo Shim
- Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University, Jinju, Korea
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Shim WB, Choi JG, Kim JY, Yang ZY, Lee KH, Kim MG, Ha SD, Kim KS, Kim KY, Kim CH, Ha KS, Eremin SA, Chung DH. Production of monoclonal antibody against Listeria monocytogenes and its application to immunochromatography strip test. J Microbiol Biotechnol 2007; 17:1152-1161. [PMID: 18051327] [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
An immunochromatography (ICG) strip test based on a monoclonal antibody for the rapid detection of L. monocytogenes in meat and processed-meat samples was developed in this study. A monoclonal antibody (MAb) specific to L. monocytogenes was produced from cloned hybridoma cells (FKLM-3B12-37) and used to develop an ICG strip test. The antibody showed a stronger binding to L. monocytogenes than other Listeria species, and a weak cross-reaction to S. aureus based on an ELISA. The detection limit of the ICG strip test was 10(5) cell/ml. In total, 116 meat and processed-meat samples were collected and analyzed using both the ICG strip test and a PCR. The ICG strip test and PCR indicated L. monocytogenes contamination in 34 and 27 meat samples, respectively. The 7 meat samples not identified as L. monocytogenes positive by the PCR were also tested using an API kit and found to be contaminated by Listeria species. In conclusion, the ICG strip test results agreed well with those obtained using the PCR and API kit. Thus, the developed ICG has potential use as a primary screening tool for L. monocytogenes in various foods and agricultural products, generating results within 20 min without complicated steps.
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Affiliation(s)
- Won-Bo Shim
- Division of Applied Life Science (Brain Korea 21 Program), Graduate School of Gyeongsang National University, Chinju 660-701, Korea
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Joung HA, Shim WB, Chung DH, Ahn J, Chung BH, Choi HS, Ha SD, Kim KS, Lee KH, Kim CH, Kim KY, Kim MG. Screening of a specific monoclonal antibody against and detection ofListeria monocytogenes whole cells using a surface plasmon resonance biosensor. BIOTECHNOL BIOPROC E 2007. [DOI: 10.1007/bf03028630] [Citation(s) in RCA: 15] [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: 10/21/2022]
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Yang ZY, Shim WB, Kim MG, Lee KH, Kim KS, Kim KY, Kim CH, Ha SD, Chung DH. Production and characterization of monoclonal and recombinant antibodies against antimicrobial sulfamethazine. J Microbiol Biotechnol 2007; 17:571-578. [PMID: 18051266] [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
A monoclonal antibody (mab) against the antimicrobial sulfamethazine was prepared and characterized by an indirect competitive enzyme-linked immunosorbent assay (IC-ELISA). Sulfamethazine in the range of 0.2 and 45 ng/ml could be determined with the mab by IC-ELISA. cDNAs encoding a variable heavy chain and variable light chain of the mab were cloned to produce recombinant antibodies using phage display technology. Following phage rescue and three rounds of panning, a single-chain variable fragment (scFv) antibody with high sulfamethazine-binding affinity was obtained. ELISA analysis revealed that scFv antibody and parent mab showed similar, but not identical, characteristics. The IC50 value by IC-ELISA with scFv antibody was 4.8 ng/ml, compared with 1.6 ng/ml with the parent mab. Performances of the assays in the presence of milk matrix were compared; the mab-based assay was less affected than the scFv-based assay. Sixty milk samples were analyzed by mab-based IC-ELISA, and four samples were sulfamethazine positive; these results were favorably correlated with those obtained by HPLC.
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Affiliation(s)
- Zheng-You Yang
- Division of Applied Life Science, Graduate School of Gyeongsang National University, Jinju 660-701, Korea
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Jang KI, Kim MG, Ha SD, Kim KS, Lee KH, Chung DH, Kim CH, Kim KY. Morphology and adhesion of Campylobacter jejuni to chicken skin under varying conditions. J Microbiol Biotechnol 2007; 17:202-206. [PMID: 18051750] [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
The adhesion of Campylobacter jejuni to chicken skin, along with the associated morphological changes under aerobic conditions at 4, 25, and 37 degrees C and microaerobic (O2 5%, CO2 10%, N2 85%) conditions, were investigated using confocal laser scanning microscopy (CLSM), flow cytometry, and plate counting. The morphological change of C. jejuni from a spiral shape to a coccoid form or VBNC form (viable but nonculturable form) progressed rapidly under aerobic conditions at 25, 37, and 4 degrees C. As regards adhesion, the C. jejuni cells were mostly located in the crevices and feather follicles of the chicken skin, where the cells in the feather follicles floated freely in the entrapped water, even after the skin was rinsed quite thoroughly. CLSM also revealed the penetration of some spiral-shaped C. jejuni cells into the chicken skin. Even after changing their shape at various temperatures, coccoid-form C. jejuni cells were still found in the crevices and feather follicles of the chicken skin.
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Affiliation(s)
- Keum-Il Jang
- Department of Food Science and Technology and Research Center for Bioresources and Health, Chungbuk National University, Cheongfu 361-763, Korea
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Shim WB, Yang ZY, Kim JY, Choi JG, Je JH, Kang SJ, Kolosova AY, Eremin SA, Chung DH. Immunochromatography using colloidal gold-antibody probe for the detection of atrazine in water samples. J Agric Food Chem 2006; 54:9728-34. [PMID: 17177493 DOI: 10.1021/jf0620057] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
An immunochromatography (ICG) strip test for rapid detection of atrazine in water samples was developed. A monoclonal antibody (MAb) specific to atrazine was produced from the cloned hybridoma cell (AT-1-M3) and used to develop a direct competitive enzyme-linked immunosorbent assay (DC-ELISA) and ICG strip. MAb conjugated to colloidal gold, and that was applied to the conjugate pad of the ICG strip. The visual detection limit for the ICG strip was 3 ng/mL. This test required only 10 min to get results and one step of sample to perform the assay. The results of water samples spiked with 5, 10, 20, and 50 ng/mL of atrazine by ICG strip were in good agreement with those obtained by DC-ELISA. The ICG strip was sufficiently sensitive and accurate to be useful for rapid screening of atrazine in various water samples.
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Affiliation(s)
- Won-Bo Shim
- Division of Applied Life Science (Brain Korea 21 program), Graduate School of Gyeongsang National University, Chinju, Gyeongnam 660-701, Korea
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Yang ZY, Kolosova AY, Shim WB, Chung DH. Development of monoclonal antibodies against pirimiphos-methyl and their application to IC-ELISA. J Agric Food Chem 2006; 54:4551-6. [PMID: 16786997 DOI: 10.1021/jf0606196] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
To detect the organophosphorus (OP) pesticide pirimiphos-methyl in grain samples, a monoclonal antibody-based indirect competitive enzyme-linked immunosorbent assay (IC-ELISA) was developed and optimized. By the active esters method, pirimiphos-methyl hapten A was conjugated to keyhole limpet hemocyanin to be used as the immunogen for the production of monoclonal antibodies, and pirimiphos-methyl hapten B was conjugated to ovalbumin to be used as coating antigen. By using the monoclonal antibody and the coating antigen, an IC-ELISA has been developed. Under the established optimized conditions, the IC-ELISA showed an IC50 of 4.2 ng/mL with a detection limit of 0.07 ng/mL. The IC-ELISA showed negligible cross-reactivity with other OP pesticides except with pirimiphos-ethyl. Recoveries of pirimiphos-methyl from spiked grain samples ranged from 83 to 96%.
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Affiliation(s)
- Zheng-You Yang
- Division of Applied Life Science, Graduate School of Gyeongsan National University, Chinju, Gyeongnam 660-701, South Korea
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Kolosova AY, Shim WB, Yang ZY, Eremin SA, Chung DH. Direct competitive ELISA based on a monoclonal antibody for detection of aflatoxin B1. Stabilization of ELISA kit components and application to grain samples. Anal Bioanal Chem 2005; 384:286-94. [PMID: 16254721 DOI: 10.1007/s00216-005-0103-9] [Citation(s) in RCA: 163] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2005] [Revised: 08/26/2005] [Accepted: 08/31/2005] [Indexed: 10/25/2022]
Abstract
A direct competitive enzyme-linked immunosorbent assay (ELISA) based on a monoclonal antibody has been developed and optimized for detection of aflatoxin B1 (AFB1), and an ELISA kit has been designed. This immunoassay was highly specific, sensitive, rapid, simple, and suitable for aflatoxin monitoring. AFB1 concentrations determinable by ELISA ranged from 0.1 to 10 microg L(-1). The IC50 value was 0.62 microg L(-1). Recovery from spiked rice samples averaged between 94 and 113%. The effect of different reagents on the stability of HRP-AFB1 conjugate solution was studied. The performance of a stabilized enzyme tracer in ELISA was determined and compared with that of a freshly prepared control solution of HRP-AFB(1) conjugate. The results showed that stabilizing media containing 0.02% BSA, 0.1% Kathon CG, and 0.05 mol L(-1) calcium chloride in 0.05 mol L(-1) Tris-HCl buffer (pH 7.2) maintained the activity of HRP-AFB1 at a dilution of 1:1000 for a period of at least 12 months at room temperature whereas the reference conjugate solution without the additives lost its activity within a few days. Several additives were tested for their stabilizing effect on a monoclonal antibody (MAb) immobilized on the surface of polystyrene microtitre plates. It was shown that immobilized MAb, treated with post-coating solutions containing PVA, BSA, and combinations of these substances with trehalose, retained its activity for at least 4 months at 4 degrees C, whereas the untreated MAb-coated plate lost its activity within 2 days.
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Affiliation(s)
- Anna Yu Kolosova
- Laboratory of Food Analysis, Group of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Harelbekestraat 72, 9000, Ghent, Belgium.
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Kang EH, Lee EB, Shin KC, Im CH, Chung DH, Han SK, Song YW. Interstitial lung disease in patients with polymyositis, dermatomyositis and amyopathic dermatomyositis. Rheumatology (Oxford) 2005; 44:1282-6. [PMID: 15972351 DOI: 10.1093/rheumatology/keh723] [Citation(s) in RCA: 149] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVE To assess the prevalence, characteristics and prognostic factors of interstitial lung disease (ILD) in Korean patients with polymyositis (PM), dermatomyositis (DM) and amyopathic dermatomyositis (ADM). METHODS We reviewed the medical records of 72 consecutive PM and DM patients, including six patients with ADM, who were seen at the Rheumatology Clinic of Seoul National University Hospital between 1984 and 2003. RESULTS Twenty-nine PM/DM patients (40.3%) developed ILD. Anti-Jo-1 antibody and arthralgia were associated with the presence of ILD (P = 0.022 and P = 0.041, respectively), whereas dysphagia was more frequently found in patients without ILD (P = 0.041). Lung biopsies revealed diffuse alveolar damage (DAD) (n = 2), usual interstitial pneumonia (UIP) with DAD (n = 2), UIP (n = 1), and non-specific interstitial pneumonia (n = 2). Of the 29 patients, 11 (37.9%) died. The mean survival time in ILD patients was significantly shorter than in those without ILD (13.8+/-1.8 vs 19.2+/-0.9 yr, P = 0.017). Poor survival in ILD patients was associated with a Hamman-Rich-like presentation (P = 0.0000), ADM features (P = 0.0001) and an initial forced vital capacity (FVC) < or =60% (P = 0.024). CONCLUSIONS ILD was observed in 40.3% of Korean PM/DM patients and was associated with poor survival. A Hamman-Rich-like presentation, ADM features and an initial FVC < or =60% were associated with poor survival in ILD.
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Affiliation(s)
- E H Kang
- Department of Internal Medicine, Seoul National University Hospital, 28 Yongon-dong, Chongno-gu, Seoul 110-744, Korea
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Yang ZY, Shim WB, Kim JH, Park SJ, Kang SJ, Nam BS, Chung DH. Detection of aflatoxin-producing molds in Korean fermented foods and grains by multiplex PCR. J Food Prot 2004; 67:2622-6. [PMID: 15553652 DOI: 10.4315/0362-028x-67.11.2622] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
An assay based on multiplex PCR was applied for the detection of potential aflatoxin-producing molds in Korean fermented foods and grains. Three genes, avfA, omtA, and ver-1, coding for key enzymes in aflatoxin biosynthesis, were used as aflatoxin-detecting target genes in multiplex PCR. DNA extracted from Aspergillus flavus, Aspergillus parasiticus, Aspergillus oryzae, Aspergillus niger, Aspergillus terreus, Penicillium expansum, and Fusarium verticillioides was used as PCR template to test specificity of the multiplex PCR assay. Positive results were achieved only with DNA that was extracted from the aflatoxigenic molds A. flavus and A. parasiticus in all three primer pairs. This result was supported by aflatoxin detection with direct competitive enzyme-linked immunosorbent assay (DC-ELISA). The PCR assay required just a few hours, enabling rapid and simultaneous detection of many samples at a low cost. A total of 22 Meju samples, 24 Doenjang samples, and 10 barley samples commercially obtained in Korea were analyzed. The DC-ELISA assay for aflatoxin detection gave negative results for all samples, whereas the PCR-based method gave positive results for 1 of 22 Meju samples and 2 of 10 barley samples. After incubation of the positive samples with malt extract agar, DC-ELISA also gave positive results for aflatoxin detection. All Doenjang samples were negative by multiplex PCR and DC-ELISA assay, suggesting that aflatoxin contamination and the presence of aflatoxin-producing molds in Doenjang are probably low.
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Affiliation(s)
- Zheng-You Yang
- Division of Applied Life Science of Graduate School, Gyeongsang National University, Chinju 660-701 Korea
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Shim WB, Kolosova AY, Kim YJ, Yang ZY, Park SJ, Eremin SA, Lee IS, Chung DH. Fluorescence polarization immunoassay based on a monoclonal antibody for the detection of ochratoxin A. Int J Food Sci Technol 2004. [DOI: 10.1111/j.1365-2621.2004.00856.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [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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Kolosova AY, Park JH, Eremin SA, Kang SJ, Chung DH. Fluorescence polarization immunoassay based on a monoclonal antibody for the detection of the organophosphorus pesticide parathion-methyl. J Agric Food Chem 2003; 51:1107-1114. [PMID: 12590442 DOI: 10.1021/jf025801v] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A fluorescence polarization immunoassay (FPIA) based on a monoclonal antibody for the detection of parathion-methyl (PM) was developed and optimized. Fluorescein-labeled PM derivatives (tracers) with different structures were synthesized and purified by thin-layer chromatography. The influence of immunogen and tracer structures on the assay characteristics was investigated. PM concentration determinable by the FPIA ranged from 25 to 10000 ppb. The detection limit was 15 ppb. Methanol extracts of vegetable, fruit, and soil samples were diluted 1/10 for the analysis. Recovery in spiked samples averaged between 85 and 110%. The method developed is characterized by high specificity and reproducibility (CV ranged from 1.5 to 9.1% for interassay and from 1.8 to 14.1% for intra-assay). The FPIA method can be applied to the screening of food and environmental samples for PM residues without complicated cleanup.
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Affiliation(s)
- Anna Yu Kolosova
- Division of Applied Life Science, Graduate School of Gyeongsang National University, Chinju, Gyeongnam 660-701, Korea.
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