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Hwang BH, Shin HH, Seo JH, Cha HJ. Specific Multiplex Analysis of Pathogens Using a Direct 16S rRNA Hybridization in Microarray System. Anal Chem 2012; 84:4873-9. [DOI: 10.1021/ac300476k] [Citation(s) in RCA: 18] [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: 11/28/2022]
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52
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Kwon YJ, Kang BH, Bae SY, Seo JH, Kim JY, Lee EA, Wang JK, Lee YM, Go KJ, Pyo HJ, Lee JB. CALCIUM REQUIREMENT AFTER PARATHYROIDECTOMY (PTX) IN SECONDARY HYPERPARATHYROIDISM (2° HPT). Kidney Res Clin Pract 2012. [DOI: 10.1016/j.krcp.2012.04.449] [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] Open
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53
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Seo JH, Shin DS, Mukundan P, Revzin A. Attachment of hydrogel microstructures and proteins to glass via thiol-terminated silanes. Colloids Surf B Biointerfaces 2012; 98:1-6. [PMID: 22652352 DOI: 10.1016/j.colsurfb.2012.03.025] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 03/27/2012] [Accepted: 03/27/2012] [Indexed: 11/25/2022]
Abstract
Micropatterning strategies often call for attachment of non-fouling biomaterials and immobilization of proteins in order to create biosensing surfaces or to control cell-surface interactions. Our laboratory has made frequent use of hydrogel photolithography - a micropatterning process for immobilizing poly(ethylene glycol) (PEG) hydrogel microstructures on glass surfaces. In the present study we explored the use of thiolsilane as a coupling layer for both covalent anchoring of hydrogel microstructures and covalent immobilization of proteins on glass. These new surfaces were compared to acryl-silane functionalized glass slides that allowed covalent attachment of gels but only physical adsorption of proteins as well as surfaces containing a mixture of both functional groups. We observed comparable attachment and retention of hydrogel microstructures on acryl and thiol-terminated silanes. Ellipsometry studies revealed presence of significantly higher level of proteins on thiol-functionalized glass. Overall, our studies demonstrate that thiol-silane functionalized glass surfaces may be used to create complex micropatterned surfaces comprised of covalently attached hydrogels and proteins. This simple and effective surface modification strategy will be broadly applicable in cellular engineering and biosensing studies employing hydrogel micropatterns.
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Affiliation(s)
- Jeong Hyun Seo
- Department of Biomedical Engineering, University of California, Davis, CA 95616, United States
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Lee SY, Kwon JW, Seo JH, Song YH, Kim BJ, Yu J, Park KS, Kim H, Kim EJ, Lee JS, Hong SJ. Prevalence of atopy and allergic diseases in Korean children: associations with a farming environment and rural lifestyle. Int Arch Allergy Immunol 2012; 158:168-74. [PMID: 22286539 DOI: 10.1159/000330820] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Accepted: 07/11/2011] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND The results of recent studies suggest that factors in rural environments may protect against the development of allergic diseases, but the underlying mechanisms are not well understood. The aim of this study was to investigate the prevalence of allergic diseases, to establish if this prevalence is influenced by migration from rural to urban areas and to identify environmental risk factors associated with these diseases. METHODS A cross-sectional study of children aged 9-12 years from a rural village, a rural town and an urban city in Korea was conducted. Demographic and disease-related information was obtained via a detailed questionnaire, and skin prick tests were performed. RESULTS There were significant differences in lifestyle and environmental factors between children from the rural village, the rural town and the urban children. The prevalence of allergic diseases and atopy was higher in urban children. A lower prevalence of allergic diseases and atopy was associated with farming parents, contact with farm animals during pregnancy, owning pets or a stable, breast-feeding and having older siblings. A comparison of rural village and rural town children revealed no evidence of an association of allergic diseases and atopy with farming parents, contact with farm animals during pregnancy or owning a stable. On the other hand, having older siblings and antibiotic use during infancy were significantly associated with allergic diseases and atopy in these children. CONCLUSIONS Protective factors associated with a farming environment and/or rural lifestyle may influence the prevalence of allergic diseases and atopy in Korean children.
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Affiliation(s)
- S Y Lee
- Department of Pediatrics, Childhood Asthma Atopy Center, Asan Medical Center, University of Ulsan College of Medicine, School of Public Health, Seoul, Korea
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55
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Seo JH, Lee HY, Cha HJ. Characterization of the GM1 pentasaccharide–Vibrio cholera toxin interaction using a carbohydrate-based electrochemical system. Analyst 2012; 137:2860-5. [DOI: 10.1039/c2an16221k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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56
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Park KH, Gil EY, Choi YJ, Kim ST, Cho KR, Seo JH, Lee ES, Kim IS, Disis ML. P1-01-07: ErbB-2 Peptide Vaccination Suppresses Spontaneous Tumorigenesis and Tumor Stem Cell Expansion in MMTV-PyVT Transgenic Mouse. Cancer Res 2011. [DOI: 10.1158/0008-5472.sabcs11-p1-01-07] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Immunization targeting ErbB-2 could have considerable therapeutic potential by controlling growth and metastasis of highly aggressive tumor cells in the earlier preclinical and clinical studies. Just a few studies have examined preventive potential of ErbB-2 vaccines in preclinical studies. However, animal model systems used in the previous studies were tumor transplantation or neu-transgenic mouse, which were not relevant to human HER-2 positive breast tumorigenesis. In this study, active immunotherapy against tumor antigen ErbB-2/neu for primary prevention of breast cancer was tested using FVB/N-Tg (MMTV-PyVT) transgenic mice model. Mice were grouped to receive either ErbB-2 peptide vaccine, immune adjuvant only, tetanus toxoid, or PBS every 2 weeks for 3 times and monthly thereafter. The MMTV-PyVT transgenic mice in control groups (PBS, immune adjuvant only, or tetanus toxoid peptide) developed spontaneous mammary adenocarcinomas in 12 to 15 weeks, but vaccination against ErbB-2 strongly suppressed tumor formation by 30 weeks of observation. Further pathologic examination showed complete prevention of tumorigenesis was observed in ErbB-2 vaccinated mice, whereas the mice in control groups developed highly aggressive ErbB-2 overexpressing tumors similar to human breast cancer. The tumor protective effect of peptide vaccination was associated with induction of ErbB-2-specific humoral immune responses as well as T cell responses. Additionally, role of signal through ErbB-2 pathway and the relationship with stemness of cancer cells were determined by Aldefluor assay, mammosphere formation assay using Mouse mammary carcinoma (MMC) cells in vitro, and level of nestin expression determined by Western blot analysis. Further analysis of mammosphere formation capacity of MMC cells using immune sera showed that sera from ErbB2 vaccinated mice had a significant inhibitory effect on mammosphere formation in ErbB-2 overexpressing MMC cells. These results suggest that ErbB-2 targeting by cancer vaccination might be useful adjuvant to standard therapy, helping to prevent relapse in patients with ErbB-2-overexpressing tumors by suppressing stem/progenitor cell population.
Citation Information: Cancer Res 2011;71(24 Suppl):Abstract nr P1-01-07.
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Affiliation(s)
- KH Park
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - EY Gil
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - YJ Choi
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - ST Kim
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - KR Cho
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - JH Seo
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - ES Lee
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - IS Kim
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
| | - ML Disis
- 1Korea University College of Medicine, Seoul, Korea; Korea University College of Medicine; University of Washington, Seattle, WA
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57
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Abstract
A method for capture and release of cells was developed using a photolabile linker and antibody-attached glass surface with a poly(ethylene glycol) (PEG)-pattern.
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Affiliation(s)
- Dong-Sik Shin
- Department of Biomedical Engineering, University of California, Davis, 451 East Health Sciences Dr #2619, Davis, CA 95616, USA
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58
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Chen LJ, Seo JH, Eller MJ, Verkhoturov SV, Shah SS, Revzin A, Schweikert EA. Quantitative label-free characterization of avidin-biotin assemblies on silanized glass. Anal Chem 2011; 83:7173-8. [PMID: 21842883 PMCID: PMC3186069 DOI: 10.1021/ac2016085] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this study, a time-of-flight secondary ion mass spectrometer TOF-SIMS, operating in the event-by-event bombardment/detection mode was used to characterize avidin-biotin assemblies on silane-modified glass substrates. SIMS was used to analyze several variants of the biointerface, including avidin physically adsorbed on a monofunctional acryl silane surface and covalently attached on monofunctional (amine terminated) and bifunctional (amine and acryl terminated) silanes. The goal of these studies was to determine density of avidin and biotin layers chemically or physically adsorbed on silanized glass substrate. An individual impact of a C(60) projectile used in this study creates a hemispherical crater (∼10 nm in diameter) and emits large numbers of secondary ions from the same nanovolume. Thus, a single impact enables one to unfold distinct secondary ions that span the thickness of the assembled film. This method was used to monitor the presence of glass, silane, and protein ions and to estimate the thickness and density of the avidin layer. In addition, we employed the double coincidence mass spectrometry approach to identify ions coemitted from a specific stratum of the biointerface. This approach was used to determine density of biotin and avidin immobilization while eliminating interferences from isobaric ions that originated from other constituents on the surface. Overall, novel TOF-SIMS quantitative approaches employed here were useful for examining complex biointerfaces and determining both lateral and in depth composition of the film.
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Affiliation(s)
- Li-Jung Chen
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | - Jeong Hyun Seo
- Department of Biomedical Engineering, University of California, Davis, CA, USA
| | - Michael J. Eller
- Department of Chemistry, Texas A&M University, College Station, TX, USA
| | | | - Sunny S. Shah
- Department of Biomedical Engineering, University of California, Davis, CA, USA
| | - Alexander Revzin
- Department of Biomedical Engineering, University of California, Davis, CA, USA
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Seo JH, Kim CS, Lee HY, Kawai T, Cha HJ. Interactive Configuration through Force Analysis of GM1 Pentasaccharide-Vibrio cholera Toxin Interaction. Anal Chem 2011; 83:6011-7. [DOI: 10.1021/ac201013p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jeong Hyun Seo
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Chang Sup Kim
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
| | - Hea Yeon Lee
- Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
| | - Tomoji Kawai
- Institute of Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan
| | - Hyung Joon Cha
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
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60
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Seo JH, Chen LJ, Verkhoturov SV, Schweikert EA, Revzin A. The use of glass substrates with bi-functional silanes for designing micropatterned cell-secreted cytokine immunoassays. Biomaterials 2011; 32:5478-88. [PMID: 21550110 DOI: 10.1016/j.biomaterials.2011.04.026] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2011] [Accepted: 04/06/2011] [Indexed: 11/18/2022]
Abstract
It is often desirable to sequester cells in specific locations on the surface and to integrate sensing elements next to the cells. In the present study, surfaces were fabricated so as to position cytokine sensing domains inside non-fouling poly(ethylene glycol) (PEG) hydrogel microwells. Our aim was to increase sensitivity of micropatterned cytokine immunoassays through covalent attachment of biorecognition molecules. To achieve this, glass substrates were functionalized with a binary mixture of acrylate- and thiol-terminated methoxysilanes. During subsequent hydrogel photopatterning steps, acrylate moieties served to anchor hydrogel microwells to glass substrates. Importantly, glass attachment sites within the microwells contained thiol groups that could be activated with a hetero-bifunctional cross-linker for covalent immobilization of proteins. After incubation with fluorescently-labeled avidin, microwells fabricated on a mixed acryl/thiol silane layer emitted ∼ 6 times more fluorescence compared to microwells fabricated on an acryl silane alone. This result highlighted the advantages of covalent attachment of avidin inside the microwells. To create cytokine immunoassays, micropatterned surfaces were incubated with biotinylated IFN-γ or TNF-α antibodies (Abs). Micropatterned immunoassays prepared in this manner were sensitive down to 1 ng/ml or 60 pM IFN-γ. To further prove utility of this biointerface design, macrophages were seeded into 30 μm diameter microwells fabricated on either bi-functional (acryl/thiol) or mono-functional silane layers. Both types of microwells were coated with avidin and biotin-anti-TNF-α prior to cell seeding. Short mitogenic activation followed by immunostaining for TNF-α revealed that microwells created on bi-functional silane layer had 3 times higher signal due to macrophage-secreted TNF-α compared to microwells fabricated on mono-functional silane. The rational design of cytokine-sensing surfaces described here, will be leveraged in the future for rapid detection of multiple cytokines secreted by individual immune cells.
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Affiliation(s)
- Jeong Hyun Seo
- Department of Biomedical Engineering, University of California, Davis, CA 95616, USA
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61
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Ryu GY, Shin SE, Seo JH, Park JS, Chang HM, Shin S, Kim YK, Shin DM. A study on white organic light-emitting diodes co-doped with red fluorescent and blue phosphorescent dopants. J Nanosci Nanotechnol 2011; 11:4430-4433. [PMID: 21780470 DOI: 10.1166/jnn.2011.3706] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
White organic light-emitting diodes (WOLEDs) have drawn increasing attention due to their potential use in various applications such as solid-state lighting and backlight of liquid crystal displays and full-color OLEDs of red, green, and blue pixel. N,N'-dicabazolyl-3,5-benzene (mCP), the host material, was co-doped with Iridium (III) bis[(4,6-difluorophenyl)-pyridinato-N,C2']-picolinate (FIrpic), which functions not only as phosphorescent sensitizer but also blue emitter, and (2Z,2'Z)-3,3'-[4,4"-bis (dimethylamino)-1,1':4',1"-terphenyl-2',5'-diyl]bis (2-phenylacrylonitrile) (ABCV-P), which is a red fluorescent material. The fabricated device structures were as follows: (device A) Indium tin oxide (ITO)/N,N'-bis-(1-naphyl)-N,N'-diphenyl-1,1'-biphenyl-4,4'-diamine (NPB)/(mCP)/mCP:ABCV-P (1%)/4,7-diphenyl-1,10-phenanthroline (Bphen)/lithium quinolate (Liq)/aluminum (Al), (device B) ITO/NPB/mCP/mCP:FIrpic (8%)/Bphen/Liq/Al and (device C) ITO/NPB/mCP/mCP:FIrpic:ABCV-P (8%, 1%)/Bphen/Liq/Al, respectively. Phosphorescent FIrpic harvesting both singlet and triplet excitions not only emitted blue light but also transferred energy to fluorescent ABCV-P. The maximum luminance efficiency, external quantum efficiency, and luminance of white light device were measured to be 5.95 cd/A, 2.45% and 2500 cd/m2, respectively. The white device gave practically white light with the Commision Internationale de l'Eclairage (CIE(xy)) coordinate of (0.44, 0.49) which was close to warm white color (CIE(xy) = 0.45, 0.45).
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Affiliation(s)
- G Y Ryu
- Department of Mechanical and System Design, Hong-ik University, Seoul 121-791, Korea
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62
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Lee JY, Seo JH, Cho YD, Kang HS, Han MH. Endovascular treatment of wide-neck intracranial aneurysms using a microcatheter protective technique: results and outcomes in 75 aneurysms. AJNR Am J Neuroradiol 2011; 32:917-22. [PMID: 21393400 DOI: 10.3174/ajnr.a2411] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
BACKGROUND AND PURPOSE The microcatheter protective technique positions an additional microcatheter in the parent or side-branching artery to protect it during coil embolization. The purpose of this study was to describe this method and to evaluate its efficacy and safety as an alternative to a multiple-microcatheter or balloon- or stent-assisted technique for wide-neck aneurysms. MATERIALS AND METHODS A retrospective review of 74 patients (43 women; mean age, 59.6 years) with 75 wide-neck aneurysms treated with the microcatheter protective technique between January 2003 and April 2010 was performed. Immediate postembolization angiograms were evaluated by using a conventional angiographic scale, and clinical evaluation was performed by using the GOS. Clinical and imaging follow-up were available in 57 (76%) patients, with a mean of 14.7 months. RESULTS Postembolization angiograms demonstrated total occlusion in 45 of 75 (60%) aneurysms, a neck remnant in 17 (22.7%), and body filling in 13 (17.3%). The technique-related complication rate was 17.4% (13/75), and the procedural-related morbidity rate was 1.3% (1/74). All patients, except 3 complicated cases with a GOS of <4, had a GOS of 5 at the end of the study period. Of the 57 aneurysms with follow-up, recanalization developed in 5 (8.8%) aneurysms, and 3 (5.3%) cases of major recanalization were re-treated endovascularly. CONCLUSIONS The microcatheter protective technique is feasible and safe for coil embolization of wide-neck aneurysms, especially in cases that are not suitable for multiple catheter or balloon- or stent-assisted techniques.
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Affiliation(s)
- J Y Lee
- Department of Radiology, Seoul National University College of Medicine, Korea
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63
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Seo JH, Holland K, Rose D, Rozhkov L, Fujiwara H, Byars A, Arthur T, DeGrauw T, Leach JL, Gelfand MJ, Miles L, Mangano FT, Horn P, Lee KH. Multimodality imaging in the surgical treatment of children with nonlesional epilepsy. Neurology 2011; 76:41-8. [PMID: 21205694 DOI: 10.1212/wnl.0b013e318204a380] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES To evaluate the diagnostic value of individual noninvasive presurgical modalities and to study their role in surgical management of nonlesional pediatric epilepsy patients. METHODS We retrospectively studied 14 children (3-18 years) with nonlesional intractable focal epilepsy. Clinical characteristics, surgical outcome, localizing features on 3 presurgical diagnostic tests (subtraction peri-ictal SPECT coregistered to MRI [SISCOM], statistical parametric mapping [SPM] analysis of [18F] FDG-PET, magnetoencephalography [MEG]), and intracranial EEG (iEEG) were reviewed. The localization of each individual test was determined for lobar location by visual inspection. Concordance of localization between each test and iEEG was scored as follows: 2=lobar concordance; 1=hemispheric concordance; 0=discordance or nonlocalization. Total concordance score in each patient was measured by the summation of concordance scores for all 3 tests. RESULTS Seven (50%) of 14 patients were seizure-free for at least 12 months after surgery. One (7%) had only rare seizures and 6 (43%) had persistent seizures. MEG (79%, 11/14) and SISCOM (79%, 11/14) showed greater lobar concordance with iEEG than SPM-PET (13%, 3/14) (p<0.05). SPM-PET provided hemispheric lateralization (71%, 10/14) more often than lobar localization. Total concordance score tended to be greater for seizure-free patients (4.7) than for non-seizure-free patients (3.9). CONCLUSIONS Our data suggest that MEG and SISCOM are better tools for lobar localization than SPM analysis of FDG-PET in children with nonlesional epilepsy. A multimodality approach may improve surgical outcome as well as selection of surgical candidates in patients without MRI abnormalities.
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Affiliation(s)
- J H Seo
- Division of Pediatric Neurology, Department of Radiology, Cincinnati Children's Hospital Medical Center, University of Cincinnati College of Medicine, 3333 Burnet Avenue, Cincinnati, OH 45229-3339, USA
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Abstract
Optimal operating conditions have been determined for recombinant Escherichia coli cells in a fed-batch and two-stage continuous fermentors. The model expression system used in this article was the E. coli trp promoter cloned on plasmids. Model equations for cell growth and cloned-gene expression have been formulated and used to evaluate process performances under different operating modes. The operating variables manipulated for maximum performance include the timing of IAA addition to derepress transcription from the trp promoter. The total operating period and the nutrient concentration profile during fermentations. For a fed-batch mode, the performance was significantly improved by adjusting the IAA addition (environmental switch) time relative to the total operation period. It was found that the optimal switching time exists for a given total operation period. For a two-stage continuous fermentation system, the productivity is more sensitive to the combination of the dilution rates than to the volume ratio of two reactors. In general, as long as the down time is less than the total operation time in the fed-batch mode, the fed-batch mode gives higher productivity than the two-stage continuous system.
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Affiliation(s)
- T H Park
- School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
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65
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Abstract
A carbohydrate chip based on glass or other transparent surfaces has been suggested as a potential tool for high-throughput analysis of carbohydrate-protein interactions. Here we proposed a facile, efficient, and cost-effective method whereby diverse carbohydrate types are modified in a single step and directly immobilized onto a glass surface, with retention of functional orientation. We modified various types of carbohydrates by reductive amination, in which reducing sugar groups were coupled with 4-(2-aminoethyl)aniline, which has di-amine groups at both ends. The modified carbohydrates were covalently attached to an amino-reactive NHS-activated glass surface by formation of stable amide bonds. This proposed method was applied for efficient construction of a carbohydrate microarray to analyze carbohydrate-protein interactions. The carbohydrate chip prepared using our method can be successfully used in diverse biomimetic studies of carbohydrates, including carbohydrate-biomolecule interactions, and carbohydrate sensor chip or microarray development for diagnosis and screening.
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Affiliation(s)
- Jeong Hyun Seo
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
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Chang Y, Jung TD, Kim JY, Lee YS, Kim DH, Lee JJ, Seo JH, Lee HJ. Effect of repetitive transcranial magnetic stimulation in a patient with chronic crossed aphasia: fMRI study. J Rehabil Med 2010; 42:973-8. [DOI: 10.2340/16501977-0637] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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67
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Kim CS, Seo JH, Hwang BH, Kim BJ, Jo BH, Cha HJ. Functional carbohydrate microarray for carbohydrate–protein interaction. J Biosci Bioeng 2009. [DOI: 10.1016/j.jbiosc.2009.08.415] [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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68
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Moon YS, Paik SK, Seo JH, Yi HW, Cho YS, Moritani M, Yoshida A, Ahn CDK, Kim YS, Bae YC. GABA- and glycine-like immunoreactivity in axonal endings presynaptic to the vibrissa afferents in the cat trigeminal interpolar nucleus. Neuroscience 2008; 152:138-45. [PMID: 18248903 DOI: 10.1016/j.neuroscience.2007.11.033] [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] [Received: 10/08/2007] [Revised: 11/20/2007] [Accepted: 11/21/2007] [Indexed: 10/22/2022]
Abstract
The goal of this study was to analyze the synaptic interaction of primary afferents with GABA- and/or glycine-immunopositive presynaptic endings in the cat trigeminal interpolar nucleus (Vi). Fast adapting vibrissa afferents were labeled by intra-axonal injections of horseradish peroxidase. Postembedding immunogold labeling on serially cut ultrathin sections and quantitative ultrastructural analysis of the labeled boutons and their presynaptic endings (p-endings) in the Vi were performed. The majority of p-endings presynaptic to labeled boutons (83%) were immunopositive for both GABA and glycine and 8% were immunopositive for glycine alone. A small fraction of p-endings were immunopositive for GABA alone (4%) or immunonegative for both GABA and glycine (4%). Ultrastructural parameters related to synaptic release, i.e. bouton volume, mitochondrial volume, and active zone area, were significantly larger in the labeled boutons of primary afferents than in the p-endings. The volume of labeled boutons was positively correlated with the number of the postsynaptic dendrites and p-endings. In addition, fairly large-sized labeled boutons and p-endings were frequently observed in the Vi. These results reveal that large majority of vibrissa afferents in the Vi are presynaptically modulated by interneurons immunopositive for both GABA and glycine, and suggest that the Vi plays a distinct role in the processing of orofacial sensory information, different from that of other trigeminal sensory nuclei.
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Affiliation(s)
- Y S Moon
- Department of Anatomy, School of Medicine, Catholic University of Daegu, 3056-6, Daemyong-Dong, Nam-Gu, Daegu 705-718, Korea
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Seo JH, Heo HY, Han BH, Lee SY. Comparison of birdcage and phase array coil using FDTD for the B(1) homogeneity in high field MRI. ACTA ACUST UNITED AC 2008; 2007:3902-5. [PMID: 18002852 DOI: 10.1109/iembs.2007.4353186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
RF coils play an important role to acquire MR images with the maintenance of high homogeneity in high field MR system more than 3.0 T. Many kinds of RF coils such as birdcage coil, STR, surface coil, and phase array coil have been used, however, the good uniformity of a coil has always been an issue. In this paper, comparison of B(1) homogeneity between birdcage and phase array coil was investigated using FDTD method at 3.0 T MRI in order to develop RF coils with the high uniformity. Three different configurations of the FDTD simulation were performed like as using a free space configuration, water phantom configuration, and head mesh model. B1 homogeneity was calculated to the case of birdcage coil and 8-channel phase array coil in each configuration of simulation. Improvement on the homogeneity of the images and reduction of standing wave effect was achieved with comparing the real MR images with the result from simulation.
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Affiliation(s)
- J H Seo
- Department of Biomedical Engineering, Kyung Hee University, Yongin, Gyeonggi, Republic of Korea
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70
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Sim YJ, Seo JH. Congenital lymphedema of the upper extremity. A case report. Eur J Phys Rehabil Med 2008; 44:89-91. [PMID: 18385633] [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]
Abstract
This study presents an unusual case of primary lymphedema of the upper extremity in a healthy 28-year-old woman. The onset of swelling of the left upper extremity was observed at birth, but was not accurately diagnosed until the patient visited our department. Diagnostic assessment included evaluating the patient's history and laboratory and radiological data, which were all normal except for the swollen upper extremity and the lymphoscintigraphy findings. The patient was diagnosed as suffering from primary lymphedema of her left arm. Complete decongestive therapy was done and her swelling mildly improved.
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Affiliation(s)
- Y J Sim
- Department of Physical Medicine and Rehabilitation, Kosin University College of Medicine, Busan, Republic of Korea
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71
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Lee BK, Lee HY, Kim P, Suh KY, Seo JH, Cha HJ, Kawai T. Stepwise self-assembly of a protein nanoarray from a nanoimprinted poly(ethylene glycol) hydrogel. Small 2008; 4:342-8. [PMID: 18256998 DOI: 10.1002/smll.200700865] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Affiliation(s)
- Bong Kuk Lee
- Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchishi, Saitama 332-0012, Japan.
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72
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Choi IK, Kim YH, Kim JS, Seo JH. PPAR-gamma ligand promotes the growth of APC-mutated HT-29 human colon cancer cells in vitro and in vivo. Invest New Drugs 2007; 26:283-8. [PMID: 18161004 DOI: 10.1007/s10637-007-9108-x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2007] [Accepted: 12/06/2007] [Indexed: 01/08/2023]
Abstract
PPAR-gamma has been known to induce suppression, differentiation and reversal of malignant changes in colon cancer in vitro. However, there are several reports that PPAR-gamma ligands enhance colon polyp development in APCmin mice in vivo. These contradictory results have not yet been thoroughly explained. To explain the contradictory results, we analyzed the effects of different concentrations of the PPAR-gamma agonist, 15-deoxy-D12, 14-prostaglandin (15-d Delta PGJ2) and pioglitazone, on APC gene-mutated colon cancer cell lines (HT-29). We measured cell growth and suppression by cell count and MTT assay and analyzed the expression of beta-catenin and c-Myc protein by Western blot. In addition, we inoculated HT-29 cells into APCmin mice to compare tumor size. High concentrations (10-100 microM/L 15-d Delta PGJ2 and pioglitazone) of PPAR-gamma ligand suppressed growth, while low concentrations (0.01-1 microM/L 15-d Delta PGJ2 and pioglitazone) of PPAR-gamma ligand promoted growth. In particular, the effects of 0.1 microM/L 15-d Delta PGJ2 and pioglitazone on cell growth were statistically significant (P = 0.003, P = 0.001, respectively). Tumor growth was associated with an increase in beta-catenin and c-Myc expression. The growth of xenograft tumors was greater in PPAR-gamma ligand-treated mice than in control mice (control vs day 14: P = 0.024, control vs day 28: P = 0.007). The expression of beta-catenin and c-Myc protein were also elevated in PPAR-gamma-treated mouse tissues. PPAR-gamma ligand can promote the growth of APC-mutated HT-29 colon cancer cells in vitro and in vivo. In addition, the tumor promoting effect seems to be associated with an increase in beta-catenin and c-Myc expression. We think that well-controlled clinical trials should be conducted to confirm our results and to verify clinical applications.
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Affiliation(s)
- I K Choi
- Division of Medical Oncology, Department of Internal Medicine, Medical College, Korea University Guro Hospital, 80 Guro-dong, Seoul, South Korea
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73
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Seo JH, Adachi K, Lee BK, Kang DG, Kim YK, Kim KR, Lee HY, Kawai T, Cha HJ. Facile and Rapid Direct Gold Surface Immobilization with Controlled Orientation for Carbohydrates. Bioconjug Chem 2007; 18:2197-201. [DOI: 10.1021/bc700288z] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeong Hyun Seo
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Kyouichi Adachi
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Bong Kuk Lee
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Dong Gyun Kang
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Yeon Kyu Kim
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Kyoung Ro Kim
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Hea Yeon Lee
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Tomoji Kawai
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Hyung Joon Cha
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea, Institute for Scientific and Industrial Research, Osaka University, Osaka 567-0047, Japan, and Core Research for Evolutional Science and technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
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74
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Kim IY, Yoo MK, Seo JH, Park SS, Na HS, Lee HC, Kim SK, Cho CS. Evaluation of semi-interpenetrating polymer networks composed of chitosan and poloxamer for wound dressing application. Int J Pharm 2007; 341:35-43. [PMID: 17482781 DOI: 10.1016/j.ijpharm.2007.03.042] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2006] [Revised: 03/22/2007] [Accepted: 03/28/2007] [Indexed: 11/20/2022]
Abstract
We have elsewhere reported the work on the preparation of semi-interpenetrating polymer networks (SIPNs) composed of chitosan (CS) and poloxamer to improve the mechanical strength of CS sponge. This study focuses on evaluation of the CS/poloxamer SIPNs to intend for wound dressing application and the efficacy of dehydroepiandrosterone (DHEA)-loaded CS/poloxamer SIPNs in the wound model studies. The properties required for ideal wound dressing, such as equilibrium water content (EWC), water absorption (A(w)), water vapor transmission rate (WVTR), and evaporative water loss, were examined. The CS/poloxamer SIPNs were found to have a water content of 90% of their weight which could prevent the wound bed from accumulation of exudates and also have excellent water adsorption. The WVTR of CS/poloxamer SIPNs was found to be 2,508.2+/-65.7gm(-2)day(-1), indicating that the SIPNs can maintain a moist environment over wound bed in moderate to heavily exuding wound which enhances epithelial cell migration during the healing process. Also, the CS/poloxamer SIPNs in vitro assessment showed proper biodegradation and low cytotoxicity for wound dressing application. The wound healing efficacy of CS/poloxamer SIPNs as a wound dressing was evaluated on experimental full thickness wounds in a mouse model. It was found that the wounds covered with CS/poloxamer SIPNs or DHEA-loaded CS/poloxamer SIPNs were completely filled with new epithelium without any significant adverse reactions after 3 weeks. The results thus indicate that CS/poloxamer SIPNs could be employed in the future as potential wound dressing materials.
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Affiliation(s)
- I Y Kim
- School of Agricultural Biotechnology, Seoul National University, Seoul 151-921, South Korea
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75
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Seo JH, Pedersen TM, Chang GS, Moewes A, Yoo KH, Cho SJ, Whang CN. Probing Interfacial Characteristics of Rubrene/Pentacene and Pentacene/Rubrene Bilayers with Soft X-Ray Spectroscopy. J Phys Chem B 2007; 111:9513-8. [PMID: 17658782 DOI: 10.1021/jp070347p] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The electronic structure of rubrene/pentacene and pentacene/rubrene bilayers has been investigated using soft X-ray absorption spectroscopy, resonant X-ray emission spectroscopy, and density-functional theory calculations. X-ray absorption and emission measurements reveal that it has been possible to alter the lowest unoccupied and the highest occupied molecular orbital states of rubrene in rubrene/pentacene bilayer. In the reverse case, one gets p* molecular orbital states originating from the pentacene layer. Resonant X-ray emission spectra suggest a reduction in the hole-transition probabilities for the pentacene/rubrene bilayer in comparison to reference pentacene layer. For the rubrenepentacene structure, the hole-transition probability shows an increase in comparison to the rubrene reference. We also determined the energy level alignment of the pentacene-rubrene interface by using X-ray and ultraviolet photoelectron spectroscopy. From these comparisons, it is found that the electronic structure of the pentacene-rubrene interface has a strong dependence on interface characteristics which depends on the order of the layers used.
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Affiliation(s)
- J H Seo
- Institute of Physics and Applied Physics, Yonsei University, Seoul, 120-749, Korea
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76
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Li L, Kim YS, Hwang DS, Seo JH, Jung HJ, Du J, Cha HJ. High and compact formation of baculoviral polyhedrin-induced inclusion body by co-expression of baculoviral FP25 in Escherichia coli. Biotechnol Bioeng 2007; 96:1183-90. [PMID: 17004271 DOI: 10.1002/bit.21193] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Previously, we found that baculoviral polyhedrin (Polh) can successfully be used in Escherichia coli as a fusion partner for the expression of special foreign proteins as inclusion bodies, and the resulting, easily isolatable Polh-induced fusion inclusion bodies had almost the same characteristics as the native Polh. Here, we investigated the effects of co-expression of baculoviral FP25 protein on Polh-induced inclusion-body production in an E. coli expression system, as FP25 is known to be involved specifically in polyhedra formation. Using several analytical tools, including SDS-PAGE, pronase proteolysis, solubilization under alkaline conditions, and electron microscopy, we found that co-expressed FP25 was associated with Polh-induced inclusion bodies and that its co-expression led to formation of compact inclusion bodies as well as high production levels. We confirmed that FP25 co-expression induced higher production levels of other heterologous protein, antimicrobial peptide Hal18, fused with aggregation-prone Polh. Therefore, co-expression of baculoviral FP25 can be promisingly used to increase the levels of baculoviral Polh-fused foreign proteins, especially harmful proteins, expressed as inclusion bodies in an E. coli expression system.
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Affiliation(s)
- Lin Li
- Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Korea
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77
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Oh SC, Sur HY, Sung HJ, Choi IK, Park SS, Seo JH, Jeen YT, Chun HJ, Shin SW, Mok YJ, Kim JS, Kim YH. A phase II study of biweekly dose-intensified oral capecitabine plus irinotecan (bXELIRI) for patients with advanced or metastatic gastric cancer. Br J Cancer 2007; 96:1514-9. [PMID: 17473829 PMCID: PMC2359951 DOI: 10.1038/sj.bjc.6603752] [Citation(s) in RCA: 12] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Capecitabine, a prodrug of 5-FU, has been reported to generate maximal tumour activity at tumour sites and/or to improve drug tolerability as compared with 5-FU infusion, and it has also been demonstrated to act synergistically with irinotecan against some solid cancers. A previous study concluded that dose-intensified biweekly capecitabine seems to be more effective at increasing both response rate and progression-free survival time than conventional dose and schedule of capecitabine in colon cancer. We conducted this study to ascertain the efficacy and toxicity of dose-intensified biweekly capecitabine and irinotecan combination chemotherapy in chemotherapy-naïve advanced or metastatic gastric cancer patients. Patients were treated with irinotecan 130 mg m−2 intravenously for 90 min on days 1 and 15. Capecitabine at 3500 mg m−2 day−1, divided into two sessions per day, was administered for seven consecutive days from days 1 and 15, and followed by a 7-day drug-free period, respectively. Fifty-five eligible patients were enrolled in this study from November 2003 to April 2006. There were 22 women and 33 men: median patient age was 54 years (range: 27–81). A total of 200 treatment cycles were administered at a median number of four per patient (range: 1–9). Intent-to-treatment analysis showed that one patient achieved complete response (1.8%), 23 partial response (41.8%), 15 stable disease (27.3%), 10 progressive disease (18.2%) and 6 were non-evaluable (10.9%). The overall response rate was 43.6% (95% confidence interval: 30.2–56.9). The common grade 3–4 toxicities were neutropenia in 12 (21.8%), nausea/vomiting in 3 (5.4%) and diarrhea in 4 (7.2%) patients. Median time to progression was 5 months (range: 0.5–11 months), median survival duration was 11 months (range: 0.5–45 months) and median response duration was 6 months (range: 0.5–9 months). Biweekly dose-intensified capecitabine and irinotecan combination chemotherapy was active for the treatment of advanced or metastatic gastric cancers with a tolerable safety profile.
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Affiliation(s)
- S C Oh
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - H Y Sur
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - H J Sung
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - I K Choi
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - S S Park
- Department of General Surgery, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - J H Seo
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - Y T Jeen
- Section of Gastrointestinal Disease, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - H J Chun
- Section of Gastrointestinal Disease, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - S W Shin
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - Y J Mok
- Department of General Surgery, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - J S Kim
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
| | - Y H Kim
- Section of Hemato-Oncology, Department of Internal Medicine, Korea University College of Medicine, 126-1, Anam-Dong 5Ga, Sungbuk-Gu, Seoul 136-705, Korea
- E-mail:
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78
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Seo JH, Kim CY, Kang SJ, Yoo KH, Whang CN, Moewes A, Chang GS. Electronic structure of NPB and BCP molecules probed by x-ray emission spectroscopy. J Chem Phys 2007; 126:064706. [PMID: 17313237 DOI: 10.1063/1.2464086] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Soft x-ray absorption and emission spectroscopies have been employed to investigate the electronic structure and chemical bonding of two prototypical molecules, N,N(')-bis-(1-naphthyl)-N,N(')-diphenyl-1,1(')-biphenyl-4,4(')-diamine (NPB) and bathocuproine (BCP), which are frequently chosen because of their hole-transporting and hole-blocking properties, respectively. The resulting resonant C Kalpha x-ray emission spectra of these materials reveal different spectral features depending on the resonant excitation energy. According to the N absorption and emission spectra, the contribution of N atoms to the highest occupied and lowest unoccupied molecular orbitals is different for in NPB and in BCP. Detailed knowledge of these materials will allow tailoring charge transport properties of organic devices in order to develop high performance organic light-emitting diodes and photovoltaic cells.
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Affiliation(s)
- J H Seo
- Institute of Physics and Applied Physics, Yonsei University, Seoul 120-749, Korea
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79
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Moon HS, Lee HG, Seo JH, Chung CS, Kim TG, Kim IY, Lim KW, Seo SJ, Choi YJ, Cho CS. Down-regulation of PPARgamma2-induced adipogenesis by PEGylated conjugated linoleic acid as the pro-drug: Attenuation of lipid accumulation and reduction of apoptosis. Arch Biochem Biophys 2006; 456:19-29. [PMID: 17084379 DOI: 10.1016/j.abb.2006.10.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2006] [Revised: 10/02/2006] [Accepted: 10/03/2006] [Indexed: 10/24/2022]
Abstract
This study is designed to evaluate whether the PEGylated conjugated linoleic acid (PCLA) as the pro-drug can have favorable stability, bioavailability, and anti-adipogenic activity in 3T3-L1 cells for anti-obesity when compared with conjugated linoleic acid (CLA) itself. The CLA was simply coupled to poly(ethylene glycol) (PEG) at the melting state without solvents or catalysts through ester linkages between the carboxylic group of CLA and the hydroxyl group of PEG. To confirm of PCLA as the pro-drug, CLA release from PCLA was investigated by using high-performance liquid chromatographic (HPLC), showing that CLA release from PCLA was almost 90% in a nearly continuous fashion over the next 75h. Apoptosis was promoted by both CLA- and PCLA-treatments with increasing concentrations. However, the level of cell apoptosis induced by PCLA was lower than that induced by CLA owing to the biocompatible and hydrophilic properties of PEG. Moreover, the PCLA decreased glycerol-3-phosphate dehydrogenase (GPDH) activity in 3T3-L1 cells by acting upon major adipocyte marker proteins such as PPARgamma2, C/EBPalpha, and aP2 modulators. Furthermore, either CLA or PCLA stimulated basal, but not isoproterenol-sensitive, lipolysis in our cell model, suggesting that both CLA and PCLA may stimulate lipolysis via hormone sensitive lipase (HSL)-independent mechanisms. These results suggest that the PCLA may prove to be a stable pro-drug to control the deposition of fat in the human body, and that the anti-adipogenic effect of the PCLA on 3T3-L1 cells will offer a challenging approach for anti-obesity.
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Affiliation(s)
- H S Moon
- School of Agricultural Biotechnology, Seoul National University, Seoul 151-921, South Korea
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80
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Jung KH, Kil SY, Choi IK, Seo JH, Shin C, Kim YS, Kim JH. Interstitial lung diseases in patients treated with oxaliplatin, 5-fluorouracil and leucovorin (FOLFOX). Int J Tuberc Lung Dis 2006; 10:1181-2. [PMID: 17044215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023] Open
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81
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Seo JH, Yeo JS, Cha HJ. Baculoviral polyhedrin-Bacillus thuringiensis toxin fusion protein: a protein-based bio-insecticide expressed in Escherichia coli. Biotechnol Bioeng 2005; 92:166-72. [PMID: 15981278 DOI: 10.1002/bit.20592] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Previously, we found that baculoviral polyhedrin (Polh) used as a fusion partner for recombinant expression in Escherichia coli showed almost the same characteristics (rapid solubilization under alkaline conditions and specific degradation by specific alkaline proteases in insect midgut) as the native baculoviral Polh, and formed easily isolatable inclusion bodies. Here, Polh derived from the Autographa californica nuclear polyhedrosis virus (AcNPV) was fused with a Bacillus thuringiensis (Bt) toxin protein (truncated Cry1Ac having toxin region as a model Bt toxin) for the novel generation of a new bio-insecticide. The Polh-Cry1Ac fusion protein (approximately 99 kDa) was highly expressed (3.6-fold induction as compared to E. coli-derived single Cry1Ac (approximately 68 kDa)) as an insoluble inclusion body fraction in E. coli. Trypsin and alpha-chymotrypsin, which have similar properties to the insect midgut alkaline proteases, rapidly degraded the Polh portion in vitro, leaving only the toxic Cry1Ac protein behind. In vivo, the Polh-Cry1Ac fusion protein showed high insecticidal activity against the pest, Plutella xylostella. Because this novel bio-insecticide employs E. coli as the host, mass production at a low cost should be possible. Also, since this is a protein-based insecticide, living modified organism (LMO) issues such as environmental and ecological safety can be avoided.
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Affiliation(s)
- Jeong Hyun Seo
- Department of Chemical Engineering & Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang, Korea
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82
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Wei Q, Kim YS, Seo JH, Jang WS, Lee IH, Cha HJ. Facilitation of expression and purification of an antimicrobial peptide by fusion with baculoviral polyhedrin in Escherichia coli. Appl Environ Microbiol 2005; 71:5038-43. [PMID: 16151084 PMCID: PMC1214617 DOI: 10.1128/aem.71.9.5038-5043.2005] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Several fusion strategies have been developed for the expression and purification of small antimicrobial peptides (AMPs) in recombinant bacterial expression systems. However, some of these efforts have been limited by product toxicity to host cells, product proteolysis, low expression levels, poor recovery yields, and sometimes an absence of posttranslational modifications required for biological activity. For the present work, we investigated the use of the baculoviral polyhedrin (Polh) protein as a novel fusion partner for the production of a model AMP (halocidin 18-amino-acid subunit; Hal18) in Escherichia coli. The useful solubility properties of Polh as a fusion partner facilitated the expression of the Polh-Hal18 fusion protein ( approximately 33.6 kDa) by forming insoluble inclusion bodies in E. coli which could easily be purified by inclusion body isolation and affinity purification using the fused hexahistidine tag. The recombinant Hal18 AMP ( approximately 2 kDa) could then be cleaved with hydroxylamine from the fusion protein and easily recovered by simple dialysis and centrifugation. This was facilitated by the fact that Polh was soluble during the alkaline cleavage reaction but became insoluble during dialysis at a neutral pH. Reverse-phase high-performance liquid chromatography was used to further purify the separated recombinant Hal18, giving a final yield of 30% with >90% purity. Importantly, recombinant and synthetic Hal18 peptides showed nearly identical antimicrobial activities against E. coli and Staphylococcus aureus, which were used as representative gram-negative and gram-positive bacteria, respectively. These results demonstrate that baculoviral Polh can provide an efficient and facile platform for the production or functional study of target AMPs.
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Affiliation(s)
- Quande Wei
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
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83
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Park JY, Seo JH, Whang CN, Kim SS, Choi DS, Chae KH. Structural determination of the low-coverage phase of Al on Si(001) surface. J Chem Phys 2005; 122:244723. [PMID: 16035809 DOI: 10.1063/1.1947767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The atomic structure of Al layer on Si(001)-(2 x 1) surface has been studied by coaxial impact collision ion scattering spectroscopy. When 0.5 monolayer (ML) of Al atoms are adsorbed on Si(001) at room temperature, it is found that Al adatoms are dimerized and Al ad-dimers are oriented parallel to the underlying Si dimers at the position of centering T3 site with a height of 1.02 Angstroms from the first layer of Si(001). The bond length of the Al dimer is 2.67 Angstroms. With increasing Al coverage up to one ML, Al ad-dimers still occupied near T3 site and the next favorable site is near HH site.
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Affiliation(s)
- J Y Park
- Institute of Physics and Applied Physics, Yonsei University, Seoul, Korea
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84
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Abstract
The atomic structure of reconstructed Si(001)c(4 x 4)-C surface has been studied by coaxial impact collision ion scattering spectroscopy. When the 100L of ethylene (C(2)H(4)) molecules have been exposed on Si(001)-(2 x 1) surface at 700 degrees C, it is found that C atoms cause the ordering of missing Si dimer defects and occupy the fourth layer of Si(001) directly below the bridge site. Our results provide the support for the previous model in which a missing dimer structure is accompanied by C incorporation into the subsurface.
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Affiliation(s)
- J Y Park
- Institute of Physics & Applied Physics, Yonsei University, Seoul 120-749, Korea
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85
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Oh SC, Park KH, Choi IK, Yoon SY, Kim SJ, Seo JH, Choi CW, Kim BS, Shin SW, Kim JS, Kim YH. Docetaxel (Taxotere), cisplatin, UFT, and leucovorin combination chemotherapy in advanced gastric cancer. Br J Cancer 2005; 92:827-31. [PMID: 15726097 PMCID: PMC2361894 DOI: 10.1038/sj.bjc.6602446] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
We conducted this study to ascertain the efficacy and toxicity of docetaxel and cisplatin combined with oral UFT and leucovorin as a first-line treatment for patients with advanced gastric cancer. In all, 52 patients received courses of docetaxel 60 mg m(-2) intravenously (i.v.) for 1 h and then cisplatin 75 mg m(-2) i.v. for 2 h on day 1. Oral UFT at 400-600 mg day(-1), as determined by body surface area, and leucovorin at 75 mg day(-1) were administered for 21 consecutive days from day 1, and this was followed by a 7-day drug-free interval. A total of 225 courses were administered, and the median number of courses per patient was four. Four complete responses (7.7%) and 22 partial responses (42.3%) were achieved, giving an overall response rate of 50% (95% Confidence Interval: 36.4-63.6%). The major toxicity was neutropenia, which reached grade 3/4 in 36 patients (69.3%). Grade 3/4 nausea and vomiting was observed in 12 patients (23.1%). Median time to progression was 22 weeks (4 to 156+ weeks), median survival duration was 48 weeks (4 to 156+ weeks), and median response duration was 24 weeks (6-152 weeks). We conclude that docetaxel, cisplatin, oral UFT, and leucovorin combination chemotherapy is effective and tolerable for the treatment of advanced gastric cancer.
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Affiliation(s)
- S C Oh
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - K H Park
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - I K Choi
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - S Y Yoon
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - S J Kim
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - J H Seo
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - C W Choi
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - B S Kim
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - S W Shin
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - J S Kim
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
| | - Y H Kim
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea
- Department of Internal Medicine, Division of Hematology/Oncology, Korea University Medical Center, Anam Hospital, 126-1, 5-Ga Anam-Dong, Sungbuk-Gu, Seoul 136-705, Korea. E-mail:
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86
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Abstract
Baculoviral polyhedrin, which originated from Autographa californica nuclear polyhedrosis virus (AcNPV), was employed for the first time as a novel fusion partner for expression of foreign proteins in an Escherichia coli system. We characterized the expression of recombinant polyhedrin protein fused to green fluorescent protein (GFP). The polyhedrin fusion protein ( approximately 58 kDa) was successfully expressed as an insoluble inclusion body comprising approximately 30% of the total cellular protein. The E. coli expressing polyhedrin-GFP fusion protein showed higher cell growth ( approximately 1.8-fold) and higher GFP yield ( approximately 3.5-fold) than the strain expressing soluble single GFP. Interestingly, the polyhedrin fusion portion showed almost the same characteristics as the native baculoviral polyhedrin; it was rapidly solubilized under alkaline conditions, similar to the conditions found in the insect midgut. In addition, the polyhedrin fusion portion was rapidly digested by alkaline proteases in insect Plutella xylostella midgut as well as by alpha-chymotrypsin, a protease that has similar properties to insect midgut polyhedra-associated alkaline proteases. These unique properties suggest that baculoviral polyhedrin might be an advantageous fusion partner for production of foreign proteins, especially harmful proteins, in E. coli expression systems.
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Affiliation(s)
- Jeong Hyun Seo
- Department of Chemical Engineering, Pohang University of Science and Technology, Pohang 790-784, South Korea
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87
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Seo JH, Kang DG, Cha HJ. Comparison of cellular stress levels and green-fluorescent-protein expression in several Escherichia coli strains. Biotechnol Appl Biochem 2003; 37:103-7. [PMID: 12630897 DOI: 10.1042/ba20020041] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Constructs comprising stress-gene promoter elements from rpoH (Sigma 32), clpB or dnaK linked to a green-fluorescent-protein (GFP) expression vector were previously used as non-invasive "stress probes" in Escherichia coli. We compared cellular stress responses in four E. coli strains: production hosts JM105 and BL21, and cloning hosts HB101 and TOP10. When GFP was also used as a model for foreign protein production, we generally observed that the level of expression was inversely proportional to the level of cellular stress. JM105 showed the highest cellular stress level and very low GFP expression, while BL21 exhibited the lowest cellular stress level and the highest GFP expression, in both normal and heat-shock stress environments.
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Affiliation(s)
- Jeong Hyun Seo
- Department of Chemical Engineering & Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang 790-784, South Korea
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88
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Kwon OS, Lee HS, Koh DW, Cho YJ, Park YH, Park DK, Oh YL, Seo JH, Chun HJ, Um SH, Lee SW, Choi JH, Kim CD, Ryu HS, Hyun JH, Kim AR, Kim YS. A case of primary adenosquamous carcinoma of the liver presented with liver abscess. Korean J Intern Med 2001; 16:270-3. [PMID: 11855159 PMCID: PMC4578056 DOI: 10.3904/kjim.2001.16.4.270] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
Primary adenosquamous carcinoma of the liver is a very rare type of cholangiocarcinoma and is defined as a cancer containing both squamous and adenomatous components in the same lesion. Recently, we experienced a primary adenosquamous carcinoma of the liver presented as liver abscess. A 63-year-old man was presented with a 4-day history of fever and chill. The radiologic study showed a 4 cm-sized, central hypoattenuated mass with peripheral rim enhancement in the left lobe of the liver. Ultrasonography-guided aspiration and biopsy suggested an adenocarcinoma with abscess in the liver. At laparotomy, the tumor occupied the left lobe of the liver and invaded the right diaphragm. An extended left lobectomy and a partial excision of the involved diaphragm were done. Grossly, the tumor was 6 x 5 x 5 cm in size and had an eccentric necrosis. Microscopically, the tumor was composed of adenocarcinoma and squamous cell carcinoma with a transitional area.
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Affiliation(s)
- O S Kwon
- Department of Internal Medicine, Korea University, Ansan Hospital, 516 Kojan-Dong, Ansan City, Kyungki-Do, 425-020, Korea
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89
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Seo JH, Park SH, Bak CW, Choi CW, Kim BS, Shin SW, Kim YH, Kim JS, Mok YJ, Kim JS, Han SA, Yoon JI. Clinical Significance of Peripheral Blood CEA mRNA Expression in Gastric Cancer Patients Underwent Curative Resection. Cancer Res Treat 2001; 33:483-8. [PMID: 26680827 DOI: 10.4143/crt.2001.33.6.483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PURPOSE Recent advances in molecular technology have made it possible to detect small numbers of circulating tumor cells in the peripheral blood or bone marrow. Carcinoembryonic antigen (CEA) is an oncofetal antigen that is expressed in epithelial tumor cells. CEA mRNA may be a reliable marker for the detection of tumor cells in the peripheral blood of patients with epithelial cancer. MATERIALS AND METHODS We analyzed the peripheral blood of 46 patients with gastric cancer who had undergone curative resection. The presence of CEA mRNA was serially monitored using RT-PCR (Preop, Post op 15 day, 2 months (m), 4 m, 6 m, 8 m, 10 m, 12 m). The clinical characteristics, serum CEA level and immunohistochemical staining of tumor tissue were also evaluated. Patients were followed up for 6 to 12 months. RESULTS There was no significant relationship seen between CEA mRNA RT-PCR positivity in the peripheral blood and sex, stage, serum CEA level or immunohistochemical staining for CEA antigen, During follow up,eight patients experienced recurrence; were positve for CEA mRNA RT-PCR recurrence was seen in 66.7% (6/9) of the patients who before clinical recurrence as compared to 5.4% (2/37) of patients who were negative (p=0.0002). Serial changes of CEA mRNA RT-PCR correlated with clinical recurrence; 100% in the positively converted group (3/3), 0% in the negatively converted group(0/18), 50% in all positive group (3/6) and 10.5% in all negative group (2/19) experienced recurrence, respectively. CONCLUSION RT-PCR analysis of CEA mRNA in the peripheral blood seems to be a promising tool for the early detection of micrometastatic circulating tumor cells in gastric cancer patients and may be useful in determining patients at high risk for recurrence. However, definitive correlation with recurrence certainly requires a longer follow up duration in further studies.
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90
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Choi CW, Kim BS, Seo JH, Shin SW, Kim YH, Kim JS. Long-term engraftment stability of peripheral blood stem cells cryopreserved using the dump-freezing method in a -80 degrees C mechanical freezer with 10% dimethyl sulfoxide. Int J Hematol 2001; 73:245-50. [PMID: 11372739 DOI: 10.1007/bf02981945] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
In this study, we summarize our long-term follow-up data of 24 patients who underwent autologous peripheral blood stem cell transplantation (PBSCT) using the dump-freezing method in a -80 degrees C freezer. Collected peripheral blood mononuclear cells were mixed with a cryoprotectant solution consisting of autologous plasma and 20% dimethyl sulfoxide, then placed in a -80 degrees C freezer. The recovery rate of mononuclear cells (MNCs), colony-forming unit-granulocyte/macrophage (CFU-GM) colonies, and CD34+ cells were calculated. Engraftment time (with neutrophil count > 0.5 x 10(9)/L, platelet count > 50 x 10(9)/L) and normal hemopoiesis (neutrophil count > 2 x 10(9)/L, platelet count > 100 x 10(9)/L) were evaluated. Median duration of cryopreservation was 76 days. The mean recovery rates of MNCs, CFU-GM colonies, and CD34+ cells were 93.4%, 78.4%, and 95.3%, respectively. The median engraftment times of neutrophils and platelets were 8 and 27 days, respectively. The median normal hemopoiesis times of neutrophil and platelet were 31 and 45 days, respectively. Nine patients are alive and in complete remission (CR). Seven patients in first CR sustained normal hemopoiesis with a median duration of 35 months. Two patients, who achieved second CR after salvage chemotherapy due to a leukemia relapse after PBSCT, maintained engraftment status for 24 and 28 months, and 1 reached normal hemopoiesis. These results demonstrate that PBSCT using the dump-freezing method in a -80 degrees C freezer leads to acceptable long-term engraftment stability.
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Affiliation(s)
- C W Choi
- Department of Internal Medicine, Korea University Medical Center, Seoul
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91
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Choi SH, Park CH, Koo JW, Seo JH, Kim HS, Jeong SJ, Lee JH, Kim SS, Suh YH. Memory impairment and cholinergic dysfunction by centrally administered Abeta and carboxyl-terminal fragment of Alzheimer's APP in mice. FASEB J 2001; 15:1816-8. [PMID: 11481240 DOI: 10.1096/fj.00-0859fje] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- S H Choi
- Department of Pharmacology, College of Medicine, National Creative Research Initiative Centre for Alzheimer's Dementia and Neuroscience Research Institute, MRC, Seoul National University, Seoul 110-799, South Korea
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92
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Seo JH, Haam YG, Park SW, Kim DW, Jeon GS, Lee C, Hwang DH, Kim YS, Cho SS. Oligodendroglia in the avian retina: immunocytochemical demonstration in the adult bird. J Neurosci Res 2001; 65:173-83. [PMID: 11438986 DOI: 10.1002/jnr.1140] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Immunohistochemical techniques were used in conjunction with an avian-specific probe for oligodendrocyte (OLG) marker, the antibody for transferrin binding protein (TfBP), to study the characteristics and distribution of OLGs in the retina of chickens and quails. For comparison, other antibodies such as myelin basic protein, Rip, and those for labeling Müller cells and microglia were used. A large population of OLGs was found to be distributed throughout the retina, with the distinct pattern of a central-to-peripheral gradient. It was possible to detect a spectrum of OLG morphology that bore a resemblance to the subtype of the mammalian central nervous system. In addition to these mature OLGs, limited numbers of TfBP-positive (TfBP(+)) cells with the morphology of immature OLGs were found in the immediate vicinity of the optic head. The majority of OLGs appeared in the ganglion cell layer throughout the retina, whereas OLGs in the nerve fiber layer were seen mainly in the central zone of the retina, near the optic nerve head. Double-labeling experiments showed that OLGs were associated with myelin only in the central region, where the majority of retinal OLGs occurred, but not toward the periphery of the retina. The present study is the first comprehensive analysis of the morphological features and spatial distribution of OLGs in the adult avian retina and provides in vivo evidence for the existence of a substantial population of both mature and immature OLGs in the retina of adult birds. The putative functions of TfBP(+) OLGs including myelination and the tropic role of the ganglion cells are discussed in conjunction with the physical properties of TfBP and structural characteristics of the avascular retina of birds.
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Affiliation(s)
- J H Seo
- Department of Anatomy, Seoul National University College of Medicine, Seoul, Korea
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93
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Kim MD, Kang HA, Rhee SK, Seo JH. Effects of methanol on expression of an anticoagulant hirudin in recombinant Hansenula polymorpha. J Ind Microbiol Biotechnol 2001; 27:58-61. [PMID: 11598812 DOI: 10.1038/sj.jim.7000163] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2000] [Accepted: 06/10/2001] [Indexed: 11/08/2022]
Abstract
A series of batch, fed-batch, and continuous cultures was carried out to analyze the effects of methanol on the fermentation characteristics of recombinant Hansenula polymorpha for the production of hirudin, an anticoagulant. Hirudin expression efficiencies were greatly influenced by the methanol concentrations in continuous and fed-batch culture modes. At a steady state of continuous culture, an optimum methanol concentration of 1.7 g l(-1) was determined at a dilution rate of 0.18 h(-1) with 1.8 mg l(-1) h(-1) hirudin productivity.
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Affiliation(s)
- M D Kim
- Department of Food Science and Technology and Research Center for New Biomaterials in Agriculture, Seoul National University, Suwon 441-744, Korea
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94
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Shin HJ, Cho MS, Jung SY, Kim HI, Park S, Seo JH, Yoo JC, Im KI. Cytopathic changes in rat microglial cells induced by pathogenic Acanthamoeba culbertsoni: morphology and cytokine release. Clin Diagn Lab Immunol 2001; 8:837-40. [PMID: 11427438 PMCID: PMC96154 DOI: 10.1128/cdli.8.4.837-840.2001] [Citation(s) in RCA: 20] [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: 11/20/2022]
Abstract
To determine whether pathogenic Acanthamoeba culbertsoni trophozoites and lysate can induce cytopathic changes in primary-culture microglial cells, morphological changes were observed by transmission electron microscopy (TEM). In addition, the secretion of two kinds of cytokines, tumor necrosis factor alpha (TNF-alpha) and interleukin-1beta (IL-1beta), from microglial cells was observed. Trophozoites of pathogenic A. culbertsoni made contact with microglial cells and produced digipodia. TEM revealed that microglial cells cocultured with amoebic trophozoites underwent a necrotic process, accompanied by lysis of the cell membrane. TEM of microglial cells cocultured with amoebic lysate showed that the membranes of the small cytoplasmic vacuoles as well as the cell membrane were lysed. The amounts of TNF-alpha secreted from microglial cells cocultured with A. culbertsoni trophozoites or lysate increased at 6 h of incubation. The amounts of IL-1beta secreted from microglial cells cocultured with A. culbertsoni trophozoites at 6 h of incubation was similar to those secreted from the control group, but the amounts decreased during cultivation with A. culbertsoni lysate. These results suggest that pathogenic A. culbertsoni induces the cytopathic effects in primary-culture rat microglial cells, with the effects characterized by necrosis of microglial cells and changes in levels of secretion of TNF-alpha and IL-1beta from microglial cells.
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Affiliation(s)
- H J Shin
- Department of Microbiology, Ajou University School of Medicine, Suwon 442-749, Korea.
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95
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Oh SJ, Melo AC, Lee DK, Cichy SW, Kim DS, Demerci M, Seo JH, Claussen GC. Large-fiber neuropathy in distal sensory neuropathy with normal routine nerve conduction. Neurology 2001; 56:1570-2. [PMID: 11402118 DOI: 10.1212/wnl.56.11.1570] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Near-nerve needle sensory nerve conduction of plantar nerves in 100 patients with distal sensory neuropathy with normal routine nerve conduction (DSN-NNC) found the definite neuropathy pattern (abnormality in more than three of six tested nerves) in 65%, axonal neuropathy in 35%, and the known cause in 37% of patients. Absent or diminished reflexes were a reliable indicator for large fiber neuropathy (LFN). This near-nerve needle plantar nerve study provides useful and unequivocal evidence of its value in identifying neuropathy in DSN-NNC by finding LFN in 65% of patients.
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Affiliation(s)
- S J Oh
- Department of Neurology, University of Alabama at Birmingham, The Veterans Affairs Medical Centre, 35294, USA.
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96
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Lee BK, Shin SG, Seo JH, Bae MH, Lee YM, Park SJ, Park BC, Kim KW, Koo JY. Study on the Expression of Insulin-like Growth Factor II (IGF- II) in Hepatocellular Carcinoma Cells and Developing Rat Embryos. Cancer Res Treat 2001; 33:256-63. [PMID: 26680794 DOI: 10.4143/crt.2001.33.3.256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
PURPOSE The insulin-like growth factor II (IGF-II) gene expresses a family of transcripts in embryonic/fetal tissue, and also highly was expressed during hepatocellular carcinogenesis. In this study, we showed that IGF-II mRNA and protein levels are detected in rat embryo, HepG2 human hepatoma cells and Chang liver cells. MATERIALS AND METHODS This study included sections of rat embryos 7~17 days post coitum (d.p.c), HepG2 cells and Chang liver cells. Using immunohistochemistry, Northern blotting and Western blotting, we observed the expression of IGF-II in the rat embryo, HepG2 cells and Chang liver cells. RESULTS We localized IGF-II gene products in sections of rat embryo 7~17 d.p.c by performing immunohistochemistry. The IGF-II was mainly expressed in the proximal endoderm and ectoplacental cone between 7 and 9 d.p.c. At 10 d.p.c. the expression was localized at the heart primodium as well as the proximal endoderm, and at 11 d.p.c. the IGF-II was expressed in the liver and heart. After 12 d.p.c. and 14 d.p.c., the expression was also detected in the brain, muscle and bone, and head mesenchyme, respectively. While the expression of IGF-II protein was not detected in the normal adult liver, intense staining was detected in the heart, liver and choroids plexus at 17 d.p.c. CONCLUSION These results suggest that IGF-II may act as an oncofetal protein during hepatocellular carcinogenesis and embryogenesis.
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97
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Rah JC, Kim HS, Kim SS, Bach JH, Kim YS, Park CH, Seo JH, Jeong SJ, Suh YH. Effects of carboxyl-terminal fragment of Alzheimer's amyloid precursor protein and amyloid beta-peptide on the production of cytokines and nitric oxide in glial cells. FASEB J 2001; 15:1463-5. [PMID: 11387258 DOI: 10.1096/fj.00-0724fje] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- J C Rah
- Department of Pharmacology, College of Medicine, National Creative Research Initiative Centre for Alzheimer's Dementia and Neuroscience Research Institute, Medical Research Centre, Seoul National University, Seoul 110-799, Republic of Korea
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98
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Lee C, Kim DW, Jeon GS, Roh EJ, Seo JH, Wang KC, Cho SS. Cerebellar alterations induced by chronic hypoxia: an immunohistochemical study using a chick embryonic model. Brain Res 2001; 901:271-6. [PMID: 11368977 DOI: 10.1016/s0006-8993(01)02362-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A model of fetal aerogenic hypoxia was developed in which fertilized chicken eggs were half-painted with melted wax and incubated under normal conditions. The cerebellum of the hypoxic chick embryos at a later stage of development (E18-20) was analyzed immunochemically. Hypoxic insult resulted in considerable neurocytological deficits of the Purkinje cells and altered glial fibrillary acid protein (GFAP) immunoreactivity in the fetal cerebellum. Purkinje cells in the hypoxic embryos were marked by small cell size, poorly developed dendrites, low cell density, deletion and ectopia. On the other hand, enhanced GFAP immunoreactivity was found in astrocytes and Bergmann glia of the hypoxic embryos. Our results indicate that chronic hypoxia in the chick fetus can cause severe disorders of neuronal development as well as glial activation. We suggest that our hypoxic model of chick embryos could be an accessible animal model for further elucidating fetal hypoxia.
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Affiliation(s)
- C Lee
- Department of Anatomy, Seoul National University College of Medicine, 110-799, Seoul, South Korea
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99
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Chang KY, Kwon SH, Nam G, Seo JH, Kim SH, Choi KI, Kim JH, Ha DC. New cephalosporin antibiotics with 3-triazolylpyridiniummethyl substituents. J Antibiot (Tokyo) 2001; 54:460-2. [PMID: 11480891 DOI: 10.7164/antibiotics.54.460] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- K Y Chang
- Biochemicals Research Center, Korea Institute of Science and Technology, Cheongryang, Seoul
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100
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Won MH, Kang T, Park S, Jeon G, Kim Y, Seo JH, Choi E, Chung M, Cho SS. The alterations of N-Methyl-D-aspartate receptor expressions and oxidative DNA damage in the CA1 area at the early time after ischemia-reperfusion insult. Neurosci Lett 2001; 301:139-42. [PMID: 11248442 DOI: 10.1016/s0304-3940(01)01625-1] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.0] [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: 11/15/2022]
Abstract
Delayed neuronal death in the CA1 of the hippocampus following global ischemia has been evoked by both the activation of N-methyl-D-aspartate receptor (NR) and the generate reactive oxygen species in the neurons. In the present study, we investigated whether oxidative DNA damages may be correlated with NR subunits (NR1 and NR2A/B) expression following ischemia insults in vivo. Thirty minutes after ischemia-reperfusion, the intensities of both NR and 8-hydroxy-2'-deoxyguanosine (8-OHdG) immunoreactivities were markedly increased in neurons of CA1. However, NR2A/B and 8-OHdG immunoreactivities were enhanced in CA1 over 24 h after ischemia although NR1 immunoreactivity was decreased. These results suggest that oxidative stress and excitotoxicity in the CA1 may simultaneously trigger neuronal damages at early time after ischemia, and free radical damage including oxidative DNA damage may eventually promote the delayed neuronal death in this region.
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Affiliation(s)
- M H Won
- Department of Anatomy, College of Medicine, Seoul National University, Yongon-Dong, Chongno-Gu, 110-799, Seoul, South Korea
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