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Kim JH, Hong JH, Jung JG, Jung WT, Nam KY, Roh JS, Choi YW, Bang J, Huh H, Lee HJ, Moon J, Kim J, Sunwoo J. Pharmacokinetic and Safety Comparison of Fixed-Dose Combination of Cilostazol/Rosuvastatin (200 + 20 mg) Versus Concurrent Administration of the Separate Components in Healthy Adults. Clin Pharmacol Drug Dev 2024. [PMID: 38469999 DOI: 10.1002/cpdd.1390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 01/23/2024] [Indexed: 03/13/2024]
Abstract
The combined cilostazol and rosuvastatin therapy is frequently used for coronary artery disease treatment. This open-label, 3 × 3 crossover clinical trial evaluated the pharmacokinetics and safety of a fixed-dose combination (FDC) of cilostazol/rosuvastatin (200 + 20 mg) versus a concurrent administration of the separate components (SCs) under both fasted and fed conditions. Among 48 enrolled healthy adults, 38 completed the study. Participants were administered a single oral dose of cilostazol/rosuvastatin (200 + 20 mg), either as an FDC or SCs in a fasted state, or FDC in a fed state, in each period of the trial. Blood samples were taken up to 48 hours after dosing, and plasma concentrations were analyzed using validated liquid chromatography-tandem mass spectrometry. The geometric mean ratios of FDC to SCs for area under the plasma concentration-time curve from time zero to the last quantifiable concentration (AUClast ) and maximum plasma concentration (Cmax ) were 0.94/1.05 and 1.06/1.15 for cilostazol and rosuvastatin, respectively (AUClast /Cmax ). Compared with that during fasting, fed-state administration increased the AUClast and Cmax for cilostazol by approximately 72% and 160% and decreased these parameters for rosuvastatin by approximately 39% and 43%, respectively. To conclude, the FDC is bioequivalent to the SCs, with notable differences in pharmacokinetics when administered in a fed state. No significant safety differences were observed between the treatments.
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Affiliation(s)
- Jae Hoon Kim
- Clinical Trials Center, Chungnam National University Hospital, Daejeon, Republic of Korea
- Department of Medical Science, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Jang Hee Hong
- Clinical Trials Center, Chungnam National University Hospital, Daejeon, Republic of Korea
- Department of Pharmacology, Chungnam National University College of Medicine, Daejeon, Republic of Korea
| | - Jin-Gyu Jung
- Department of Family Medicine, Chungnam National University Hospital, Daejeon, Republic of Korea
| | - Won Tae Jung
- Korea United Pharmaceutical Corporation, Seoul, Republic of Korea
| | - Kyu-Yeol Nam
- Korea United Pharmaceutical Corporation, Seoul, Republic of Korea
| | - Jae Seok Roh
- Korea United Pharmaceutical Corporation, Seoul, Republic of Korea
| | - Youn Woong Choi
- Korea United Pharmaceutical Corporation, Seoul, Republic of Korea
| | - Junbae Bang
- Korea United Pharmaceutical Corporation, Seoul, Republic of Korea
| | - Hyunwook Huh
- Korea United Pharmaceutical Corporation, Seoul, Republic of Korea
| | - Hye J Lee
- Caleb Multilab Corporation, Seoul, Republic of Korea
| | - JungHa Moon
- Caleb Multilab Corporation, Seoul, Republic of Korea
| | - Jaehee Kim
- Caleb Multilab Corporation, Seoul, Republic of Korea
| | - Jung Sunwoo
- Clinical Trials Center, Chungnam National University Hospital, Daejeon, Republic of Korea
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Khwarg J, Lee S, Jang IJ, Kang WH, Lee HJ, Kim KY, Jeong KS, Won C, Choi YW, Ha DC, Jung R, Han MG, Jung WT, Nam KY, Kim Y, Yu KS, Oh J. Pharmacokinetic Comparison Between a Fixed-Dose Combination of Atorvastatin/Omega-3-Acid Ethyl Esters and the Corresponding Loose Combination in Healthy Korean Male Subjects. Drug Des Devel Ther 2024; 18:395-406. [PMID: 38352172 PMCID: PMC10861834 DOI: 10.2147/dddt.s435885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 01/03/2024] [Indexed: 02/16/2024] Open
Abstract
Purpose Statins are widely used in combination with omega-3 fatty acids for the treatment of patients with dyslipidemia. The aim of this study was to compare the pharmacokinetic (PK) profiles of atorvastatin and omega-3-acid ethyl esters between fixed-dose combination (FDC) and loose combination in healthy subjects. Methods A randomized, open-label, single-dose, 2-sequence, 2-treatment, 4-period replicated crossover study was performed. Subjects were randomly assigned to one of the 2 sequences and alternately received four FDC soft capsules of atorvastatin/omega-3-acid ethyl esters (10/1000 mg) or a loose combination of atorvastatin tablets (10 mg × 4) and omega-3-acid ethyl ester soft capsules (1000 mg× 4) for four periods, each period accompanied by a high-fat meal. Serial blood samples were collected for PK analysis of atorvastatin, eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). PK parameters were calculated by a non-compartmental analysis. The geometric mean ratio (GMR) and its 90% confidence interval (CI) of the FDC to the loose combination were calculated to compare PK parameters. Results A total of 43 subjects completed the study as planned. The GMR (90% CI) of FDC to loose combination for maximum concentration (Cmax) and area under the time-concentration curve from zero to the last measurable point (AUClast) were 1.0931 (1.0054-1.1883) and 0.9885 (0.9588-1.0192) for atorvastatin, 0.9607 (0.9068-1.0178) and 0.9770 (0.9239-1.0331) for EPA, and 0.9961 (0.9127-1.0871) and 0.9634 (0.8830-1.0512) for DHA, respectively. The intra-subject variability for Cmax and AUClast of DHA was 30.8% and 37.5%, respectively, showing high variability. Both the FDC and the loose combination were safe and well tolerated. Conclusion The FDC of atorvastatin and omega-3-acid ethyl esters showed comparable PK characteristics to the corresponding loose combination, offering a convenient therapeutic option for the treatment of dyslipidemia.
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Affiliation(s)
- Juyoung Khwarg
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - Soyoung Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
- Integrated Major in Innovative Medical Science, Seoul National University Graduate School, Seoul, Republic of Korea
| | - In-Jin Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - Won-Ho Kang
- R&D Center, Korea United Pharm. Inc., Seoul, Republic of Korea
| | | | | | | | - Chongho Won
- Caleb Multilab, Inc., Seoul, Republic of Korea
| | - Youn Woong Choi
- R&D Center, Korea United Pharm.Inc., Sejong, Republic of Korea
| | - Dae Chul Ha
- R&D Center, Korea United Pharm.Inc., Sejong, Republic of Korea
| | - RaeHoon Jung
- R&D Center, Korea United Pharm.Inc., Sejong, Republic of Korea
| | - Min-Gu Han
- R&D Center, Korea United Pharm.Inc., Sejong, Republic of Korea
| | - Won Tae Jung
- Global R&D, Korea United Pharm. Inc., Seoul, Republic of Korea
| | - Kyu-Yeol Nam
- Global R&D, Korea United Pharm. Inc., Seoul, Republic of Korea
| | - YeSeul Kim
- Global R&D, Korea United Pharm. Inc., Seoul, Republic of Korea
| | - Kyung-Sang Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - Jaeseong Oh
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
- Department of Pharmacology, Jeju National University College of Medicine, Jeju, Republic of Korea
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Yoo SJ, Kim MS, Choi YW. Pericardial diverticulum arising from the right lateral superior aortic recess: a mimicker of cystic anterior mediastinal mass. Clin Radiol 2023; 78:381-386. [PMID: 36890015 DOI: 10.1016/j.crad.2023.02.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 01/31/2023] [Accepted: 02/03/2023] [Indexed: 02/21/2023]
Abstract
AIM To report the prevalence of pericardial diverticulum of the right lateral superior aortic recess (RSAR) on computed tomography (CT), to analyse the structural CT findings of whether or not the structure is large enough to be seen on chest radiographs, and to describe changes in size and shape of RSAR on follow-up CT. MATERIALS AND METHODS A well-circumscribed, fluid-attenuation lesion in the anterior mediastinum with the following CT features was defined as a pericardial diverticulum of the RSAR: no enhancing wall, communication with the RSAR, abutment to the heart with an acute angle, and moulding by adjacent structures. Chest CT images of 31 patients with the diverticulum were evaluated, including four selected from 1,130 consecutive patients (0.4%). RESULTS The diverticulum projected ventrally from the RSAR and its largest size on axial CT ranged between 12-56 mm. Although the RSAR and the largest diverticular portion were usually seen on the same axial image (n=19), the latter sometimes lay above (n=1) or below (n=11) the former. On sagittal images, the last 11 diverticula resembled teardrops hanging from the RSAR by small stems. All of the 24 patients, each with 1-31 follow-up CT examinations, showed size fluctuations ranging between 1-46 mm (mean, 16 mm) during a follow-up period of 0.5-172 months (mean, 65 months). The diverticulum was not identifiable in five cases and was identifiable but did not show a connection with the RSAR in three cases when the diverticulum was smallest in size. CONCLUSIONS In cases of cystic anterior mediastinal mass, a deliberate search for its connection with the RSAR on all available CT images including previous studies is necessary for the diagnosis of pericardial diverticulum of the RSAR.
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Affiliation(s)
- S J Yoo
- Department of Radiology, Hanyang University Medical Center, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - M S Kim
- Department of Radiology, Hanyang University Medical Center, Hanyang University College of Medicine, Seoul, Republic of Korea; Department of Family Medicine, Samsung Medical Center, Seoul, Republic of Korea
| | - Y W Choi
- Department of Radiology, Hanyang University Medical Center, Hanyang University College of Medicine, Seoul, Republic of Korea.
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Glasbrenner DC, Choi YW, Richardson AW, Edwards EW, Mladineo MJ, Sunderman M, Keyes PH, Boyce J, Middleton JK, Howard MW. Decontamination of SARS-CoV-2 contaminated N95 filtering facepiece respirators using artificial sun lamps. J Appl Microbiol 2021; 131:2567-2578. [PMID: 33884721 PMCID: PMC8251224 DOI: 10.1111/jam.15106] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 03/30/2021] [Accepted: 04/02/2021] [Indexed: 12/23/2022]
Abstract
Aims Assess the feasibility of using light from artificial sun lamps to decontaminate N95 filtering facepiece respirators (FFRs) contaminated with SARS‐CoV‐2. Methods and Results FFR coupons or whole FFRs contaminated with 5 log10 TCID50 (target concentration) SARS‐CoV‐2 in culture media, simulated saliva, or simulated lung fluid were dried for 1–2 h, then exposed to light from tanning and horticulture lamps to assess decontamination. Exposed coupons and whole FFRs showed SARS‐CoV‐2 inactivation for all matrices tested. Furthermore, FFRs still met performance specifications after five decontamination cycles. Conclusions It is feasible that artificial sunlight from these sun lamps can be used to decontaminate FFRs provided the UV dose is sufficient and the light is unobstructed. Furthermore, decontamination can be performed up to five times without degrading FFR performance. Significance and Impact of the Study This research shows a proof of principle that artificial sun lamps may be an option to decontaminate SARS‐CoV‐2 on N95 FFRs. UV doses required for inactivation to levels below detection ranged from 4 to 37·8 J cm−2 depending on the light source, virus matrix and FFR type.
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Affiliation(s)
| | - Y W Choi
- Battelle Memorial Institute, Columbus, OH, USA
| | | | - E W Edwards
- Battelle Memorial Institute, Columbus, OH, USA
| | | | - M Sunderman
- Battelle Memorial Institute, Columbus, OH, USA
| | - P H Keyes
- Battelle Memorial Institute, Columbus, OH, USA
| | - J Boyce
- Battelle Memorial Institute, Columbus, OH, USA
| | | | - M W Howard
- Battelle Memorial Institute, Columbus, OH, USA
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Choi YW, Richardson AW, Sunderman M, Mladineo MJ, Keyes PH, Hofacre KC, Middleton JK. Decontamination of SARS-CoV-2 contaminated N95 filtering facepiece respirators (FFRs) with moist heat generated by a multicooker. Lett Appl Microbiol 2020; 72:366-374. [PMID: 33347637 PMCID: PMC7986083 DOI: 10.1111/lam.13443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 12/07/2020] [Accepted: 12/08/2020] [Indexed: 12/23/2022]
Abstract
Decontamination of N95 filtering facepiece respirators (FFRs) is a crisis capacity strategy allowed when there are known shortages of FFRs. The application of moist heat is one decontamination method that has shown promise and is the approach approved in the Steris Steam Emergency Use Authorization (EUA). This effort examines the use of multicookers to apply moist heat, as they are available in retail stores and more affordable than methods requiring more sophisticated equipment. Four of five multicooker models examined met the acceptance criteria for the test and one model was selected for inactivation testing. Tests were performed on four different FFR models with SARS‐CoV‐2 suspended in culture media, simulated saliva or simulated lung fluid. Moist heat treatment reduced recoverable titres of SARS‐CoV‐2 virus to levels below the limit of detection in all tests. Furthermore, these four FFR models showed no loss in collection efficiency, inhalation resistance or visual damage after up to 10 decontamination cycles. Two (2) FFR models showed a slight change in strap elasticity (<9%). These data show that moist heat treatment using a multicooker is a viable option for FFR decontamination in a crisis capacity strategy.
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Affiliation(s)
- Y W Choi
- Battelle Memorial Institute, Columbus, OH, USA
| | | | - M Sunderman
- Battelle Memorial Institute, Columbus, OH, USA
| | | | - P H Keyes
- Battelle Memorial Institute, Columbus, OH, USA
| | - K C Hofacre
- Battelle Memorial Institute, Columbus, OH, USA
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Park JK, Choi YW, Kim BS, Chang KS, Lee YG, Shin JH, Lim YH, Park HC, Shin J. P1880Independent effect of physical activity and resting heart rate on incidence of atrial fibrillation in general population. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy565.p1880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- J K Park
- Hanyang University, Seoul, Korea Republic of
| | - Y W Choi
- Hanyang University, Seoul, Korea Republic of
| | - B S Kim
- Hanyang University, Seoul, Korea Republic of
| | - K S Chang
- Hanyang University, Seoul, Korea Republic of
| | - Y G Lee
- Hanyang University Kuri Hospital, Cardiology, Guri, Korea Republic of
| | - J H Shin
- Hanyang University Kuri Hospital, Cardiology, Guri, Korea Republic of
| | - Y H Lim
- Hanyang University, Seoul, Korea Republic of
| | - H C Park
- Hanyang University Kuri Hospital, Cardiology, Guri, Korea Republic of
| | - J Shin
- Hanyang University, Seoul, Korea Republic of
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Lim YH, Choi YW, Park JY, Lee YG, Choi JW, Park HK, Cho SH, Cho SH. P4423Non-contact heart beat monitoring using impulse-radio ultra-wide band radar technology. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy563.p4423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Y.-H Lim
- Hanyang University, Seoul, Korea Republic of
| | - Y W Choi
- Hanyang University, Seoul, Korea Republic of
| | - J Y Park
- Hanyang University, Seoul, Korea Republic of
| | - Y G Lee
- Hanyang University, Seoul, Korea Republic of
| | - J W Choi
- Hanyang University, Seoul, Korea Republic of
| | - H K Park
- Hanyang University, Seoul, Korea Republic of
| | - S.-H Cho
- Hanyang University, Seoul, Korea Republic of
| | - S H Cho
- Hanyang University, Seoul, Korea Republic of
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Yoo H, Cho SM, Choi YW, Lee HJ, Kwon JH, Kim SW, Kim JW, Lee S, Hong JH. Comparison of pharmacokinetic characteristics of sildenafil citrate chewable tablets and film-coated tablets in healthy male subjects. Transl Clin Pharmacol 2017; 25:153-156. [PMID: 32095467 PMCID: PMC7033379 DOI: 10.12793/tcp.2017.25.3.153] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2017] [Revised: 09/04/2017] [Accepted: 09/04/2017] [Indexed: 11/19/2022] Open
Abstract
UI14SDF100CW is a chewable tablet of sildenafil citrate, which was developed to improve compliance through convenience of administration. The purpose of this study was to compare the pharmacokinetic (PK) properties of sildenafil citrate chewable tablets (UI14SDF100CW) and conventional sildenafil citrate film-coated tablets (Viagra®, Pfizer). A randomized, open-label, single dose, two-treatment, two-period, two-way crossover study was conducted in 60 healthy male volunteers. In each period, the subjects received a single oral dose of UI14SDF100CW or Viagra® (both tablets contain 140.45 mg of sildenafil citrate, which is equivalent to 100 mg of sildenafil). Serial blood samples were collected up to 24 h post-dose for PK analysis. The plasma concentration of sildenafil was determined using a validated HPLC-MS/MS assay. PK parameters of sildenafil were calculated using non-compartmental methods. The plasma concentration-time profiles of sildenafil in both formulations were similar. For UI14SDF100CW, the Cmax and AUClast of sildenafil were 1068.69 ± 458.25 (mean ± standard deviation) mg/L and 3580.59 ± 1680.29 h·mg/L, and the corresponding values for Viagra® were 1146.84 ± 501.70 mg/L and 3406.35 ± 1452.31 h·/L, respectively. The geometric mean ratios (90% confidence intervals) of UI14SDF100CW to Viagra® for Cmax and AUClast were 0.933 (0.853–1.021) and 1.034 (0.969–1.108), respectively, which met the bioequivalence criteria of Korean regulatory agency. In conclusion, UI14SDF100CW and Viagra® showed similar PK properties. Therefore, UI14SDF100CW can be an alternative to sildenafil for the treatment of erectile dysfunction, providing better compliance.
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Affiliation(s)
- Hyounggyoon Yoo
- Seoul National University College of Medicine and Hospital, Seoul 03080, Republic of Korea
| | - Sang Min Cho
- Korea United Pharm. INC., Seoul 06116, Republic of Korea
| | | | - Hye Jung Lee
- Caleb Multilab INC., Seoul 06745, Republic of Korea
| | - Ji-Hye Kwon
- Caleb Multilab INC., Seoul 06745, Republic of Korea
| | - Soo-Whan Kim
- Industrial Pharmaceutial Sciences, School of Pharmacy, Sungkyunkwan University, Seoul 16149, Republic of Korea
| | - Jae Woo Kim
- Chungnam National University College of Medicine and Hospital, Daejeon 35015, Republic of Korea
| | - SeungHwan Lee
- Seoul National University College of Medicine and Hospital, Seoul 03080, Republic of Korea
| | - Jang-Hee Hong
- Chungnam National University College of Medicine and Hospital, Daejeon 35015, Republic of Korea
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Oh JE, Lee HJ, Choi YW, Choi HY, Byun JY. Metal allergy in eyelid dermatitis and the evaluation of metal contents in eye shadows. J Eur Acad Dermatol Venereol 2016; 30:1518-21. [PMID: 27004926 DOI: 10.1111/jdv.13646] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 02/04/2016] [Indexed: 11/30/2022]
Abstract
BACKGROUND Allergic contact dermatitis is a common diagnosis in eyelid dermatitis. Sensitization to metals is prevalent in eyelid dermatitis and colour cosmetic products are frequently suspected as the source of metal exposure. OBJECTIVE To investigate the contact allergens for eyelid dermatitis and to assess metal contents in eye shadow products. METHODS Data were collected in the department of dermatology of Ewha Womans University hospital from December 1998 to February 2014. A total of 983 patients were patch tested during the period and 67 patients had eyelid dermatitis among them. To examine metal elements in colour cosmetic products for eyes, randomly selected 10 eye shadows were analysed. RESULTS Frequent allergens were metals, thiomersal and phenylenediamine in patients with eyelid dermatitis. The sensitization rates of individual allergens were not significantly different between patients with eyelid dermatitis and without eyelid dermatitis. All 10 eye shadow products contained more than 5 ppm of at least one element, nickel, cobalt or chromium. CONCLUSION Metals were top-rank allergens in patients with eyelid dermatitis as in the remaining patients patch tested. The eye shadow products contained significant amount of nickel, cobalt or chromium to elicit allergic reactions.
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Affiliation(s)
- J E Oh
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - H J Lee
- Department of Dermatology, Ewha Womans University School of Medicine, Seoul, Korea
| | - Y W Choi
- Department of Dermatology, Ewha Womans University School of Medicine, Seoul, Korea
| | - H Y Choi
- Department of Dermatology, Ewha Womans University School of Medicine, Seoul, Korea
| | - J Y Byun
- Department of Dermatology, Ewha Womans University School of Medicine, Seoul, Korea
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Son JD, Cho SM, Choi YW, Kim SH, Kwon IS, Jin EH, Kim JW, Hong JH. Pharmacokinetic characteristics of cilostazol 200 mg controlled-release tablet compared with two cilostazol 100 mg immediate-release tablets (Pletal) after single oral dose in healthy Korean male volunteers. Transl Clin Pharmacol 2016. [DOI: 10.12793/tcp.2016.24.4.183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Jin Dong Son
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon 35015, Republic of Korea
- Clinical Trials Center, Chungnam National University Hospital, Daejeon 35015, South Korea
| | - Sang Min Cho
- Korea United Pharm.Inc., Seoul 06116, Republic of Korea
| | | | - Soo-Hwan Kim
- Caleb Multilab Inc., Seoul 06745, Republic of Korea
| | - In Sun Kwon
- Clinical Trials Center, Chungnam National University Hospital, Daejeon 35015, South Korea
| | - Eun-Heui Jin
- Clinical Trials Center, Chungnam National University Hospital, Daejeon 35015, South Korea
| | - Jae Woo Kim
- Clinical Trials Center, Chungnam National University Hospital, Daejeon 35015, South Korea
| | - Jang Hee Hong
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon 35015, Republic of Korea
- Clinical Trials Center, Chungnam National University Hospital, Daejeon 35015, South Korea
- Department of Pharmacology, College of Medicine, Chungnam National University, Daejeon 35015, Republic of Korea
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11
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Woo JY, Suhng EA, Choi YW, Choi HY, Byun JY. Cystic sebaceous tumour with no evidence of Muir-Torre syndrome. J Eur Acad Dermatol Venereol 2015; 30:1038-9. [PMID: 25753622 DOI: 10.1111/jdv.13093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- J Y Woo
- Department of Dermatology, School of Medicine, Ewha Womans University, Seoul, Korea
| | - E A Suhng
- Department of Dermatology, School of Medicine, Ewha Womans University, Seoul, Korea
| | - Y W Choi
- Department of Dermatology, School of Medicine, Ewha Womans University, Seoul, Korea
| | - H Y Choi
- Department of Dermatology, School of Medicine, Ewha Womans University, Seoul, Korea
| | - J Y Byun
- Department of Dermatology, School of Medicine, Ewha Womans University, Seoul, Korea
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12
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Ha DC, Lee HY, Son YW, Yuk SH, Choi YW, Kwak BK, Shin BC, Cho CW, Cho SH. Preparation and evaluation of poly(2-hydroxyethyl aspartamide)-hexadecylamine-iron oxide for MR imaging of lymph nodes. Nanoscale Res Lett 2014; 9:38. [PMID: 24438671 PMCID: PMC3931668 DOI: 10.1186/1556-276x-9-38] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 01/07/2014] [Indexed: 06/03/2023]
Abstract
The purpose of this study was to synthesize biocompatible poly(2-hydroxyethyl aspartamide)-C16-iron oxide (PHEA-C16-iron oxide) nanoparticles and to evaluate their efficacy as a contrast agent for magnetic resonance imaging of lymph nodes. The PHEA-C16-iron oxide nanoparticles were synthesized by coprecipitation method. The core size of the PHEA-C16-iron oxide nanoparticles was about 5 to 7 nm, and the overall size of the nanoparticles was around 20, 60, and 150 nm in aqueous solution. The size of the nanoparticles was controlled by the amount of C16. The 3.0-T MRI signal intensity of a rabbit lymph node was effectively reduced after intravenous administration of PHEA-C16-iron oxide with the size of 20 nm. The in vitro and in vivo toxicity tests revealed the high biocompatibility of PHEA-C16-iron oxide nanoparticles. Therefore, PHEA-C16-iron oxide nanoparticles with 20-nm size can be potentially useful as T2-weighted MR imaging contrast agents for the detection of lymph nodes.
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Affiliation(s)
- Dae Chul Ha
- College of Pharmacy, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 305-764, Republic of Korea
| | - Ha Young Lee
- Division of Drug Discovery Research, Research Center for Medicinal Chemistry, Korean Research Institute of Chemical Technology (KRICT), 100 Jang-dong, Yuseong-gu, Daejeon 305-600, Republic of Korea
| | - Yeo Won Son
- University of Science and Technology, 113 Gwahangno, Yuseong-gu, Daejeon 305-333, Republic of Korea
| | - Soon Hong Yuk
- College of Pharmacy, Korea University, 2511 Sejongro, Sejong 339-700, Republic of Korea
| | - Youn Woong Choi
- Korea United Pharmaceuticals, Inc., 25-23 Nojanggongdan-gil, Jeondong-myeon, Sejong 339-841, Republic of Korea
| | - Byung Kook Kwak
- Chung-Ang University, 102 Heukseok-ro, Dongjak-gu, Seoul 156-755, Republic of Korea
| | - Byung Cheol Shin
- Division of Drug Discovery Research, Research Center for Medicinal Chemistry, Korean Research Institute of Chemical Technology (KRICT), 100 Jang-dong, Yuseong-gu, Daejeon 305-600, Republic of Korea
| | - Cheong-Weon Cho
- College of Pharmacy, Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon 305-764, Republic of Korea
| | - Sun Hang Cho
- Division of Drug Discovery Research, Research Center for Medicinal Chemistry, Korean Research Institute of Chemical Technology (KRICT), 100 Jang-dong, Yuseong-gu, Daejeon 305-600, Republic of Korea
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13
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Wood JP, Choi YW, Wendling MQ, Rogers JV, Chappie DJ. Environmental persistence of vaccinia virus on materials. Lett Appl Microbiol 2013; 57:399-404. [PMID: 23815079 DOI: 10.1111/lam.12126] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 05/02/2013] [Accepted: 06/26/2013] [Indexed: 11/29/2022]
Abstract
Smallpox is caused by the variola virus, and ranks as one of the most serious diseases that could originate from a biological weapon. However, limited data exist on the persistence of variola and related viruses on materials (that may act as fomites), under controlled environmental conditions. To fill these data gaps, we determined the persistence of the vaccinia virus (an established surrogate for the variola virus) as a function of temperature, relative humidity and material. Experiments were conducted with vaccinia virus in a freeze-dried form, using four materials under four sets of environmental conditions. After elapsed times ranging from 1 to 56 days, the virus was extracted from small coupons and quantified via plaque-forming units (PFU). The vaccinia virus was most persistent at low temperature and low relative humidity, with greater than 10(4) PFU recovered from glass, galvanized steel and painted cinder block at 56 days (equivalent to only a c. 2 log reduction). Thus, vaccinia virus may persist from weeks to months, depending on the material and environmental conditions. This study may aid those responsible for infection control to make informed decisions regarding the need for environmental decontamination following the release of an agent such as variola.
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Affiliation(s)
- J P Wood
- United States Environmental Protection Agency, National Homeland Security Research Center, Research Triangle Park, NC, USA
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14
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Park HJ, Choi YW, Kim SH, Shin MS, Lee SW, Oh MK, Choi HY. Change in cytokines in patients with warts after contact immunotherapy with squaric acid dibutylester. Clin Exp Dermatol 2013; 38:775-81. [PMID: 23611147 DOI: 10.1111/ced.12075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/22/2012] [Indexed: 11/28/2022]
Abstract
BACKGROUND A wart is a skin lesion caused by infection with human papillomavirus (HPV). Contact immunotherapy is one of the many therapeutic options that have been used to treat warts; however, the effectiveness of contact immunotherapy differs from patient to patient, and the cause of this variation in clinical response is unclear. AIM To assess cytokine changes in patients after contact immunotherapy with squaric acid dibutylester (SADBE). METHODS In total, 21 patients with warts and 9 healthy control subjects were enrolled in the study. The frequencies of CD3+ T cells expressing interleukin (IL)-4, IL-10, IL-12, tumour necrosis factor-α and interferon-γ were measured by flow cytometry analysis of peripheral blood at baseline in both patients and controls, and after SADBE treatment in patients. RESULTS Lower expression of IL-4 and higher expression of IL-12 in CD3+ T cells were found in patients compared with controls. The percentage of CD3+/IL-4+ T cells significantly increased after contact immunotherapy in all responders, but was significantly higher in those with an excellent response, who also had a significantly higher percentage of CD3+/IL-10+ T cells. The patients with an excellent response also had a significant decrease in the percentage of CD3+/IL-12+ T cells, and the percentage of CD3+/IL-4+ T cells normalized. CONCLUSIONS Response to contact immunotherapy can vary depending on the types of cytokine changes produced by treatment. An excessive shift to a Th2 pattern and increased IL-10 production after contact immunotherapy may hinder clearance of HPV.
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Affiliation(s)
- H J Park
- Department of Dermatology, Ilsanpaik Hospital, Inje University School of Medicine, Goyang, South Korea
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15
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Wood JP, Choi YW, Rogers JV, Kelly TJ, Riggs KB, Willenberg ZJ. Efficacy of liquid spray decontaminants for inactivation of Bacillus anthracis spores on building and outdoor materials. J Appl Microbiol 2011; 110:1262-73. [PMID: 21332900 DOI: 10.1111/j.1365-2672.2011.04980.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To obtain data on the efficacy of various liquid and foam decontamination technologies to inactivate Bacillus anthracis Ames and Bacillus subtilis spores on building and outdoor materials. METHODS AND RESULTS Spores were inoculated onto test coupons and positive control coupons of nine different materials. Six different sporicidal liquids were spray-applied to the test coupons and remained in contact for exposure times ranging from 10 to 70 min. Following decontamination, spores were recovered from the coupons and efficacy was quantified in terms of log reduction. CONCLUSIONS The hydrogen peroxide/peracetic acid products were the most effective, followed by decontaminants utilizing hypochlorous acid chemistry. Decontamination efficacy varied by material type. SIGNIFICANCE AND IMPACT OF THE STUDY The study results may be useful in the selection of technologies to decontaminate buildings and outdoor areas in the event of contamination with B. anthracis spores. These results may also facilitate selection of decontaminant liquids for the inactivation of other spore-forming infectious disease agents.
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Affiliation(s)
- J P Wood
- United States Environmental Protection Agency, National Homeland Security Research Center, Research Triangle Park, NC, USA.
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16
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Yang JK, Kim YS, Kim KI, Koo HS, Kim SM, Lee TH, Im EH, Huh KC, Choi YW, Kang YW, Kwon SJ. A case of esophageal and endobronchial anthracosis. Endoscopy 2010; 42 Suppl 2:E150-1. [PMID: 20486083 DOI: 10.1055/s-0029-1215417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- J K Yang
- Department of Gastroenterology, Konyang University College of Medicine, Daejeon, Korea
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Rogers JV, Richter WR, Shaw MQ, Choi YW. Vapour-phase hydrogen peroxide inactivates Yersinia pestis dried on polymers, steel, and glass surfaces. Lett Appl Microbiol 2009; 47:279-85. [PMID: 19241520 DOI: 10.1111/j.1472-765x.2008.02421.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS This study evaluated the inactivation of virulent Yersinia pestis dried on polymers, steel, and glass surfaces using vapour-phase hydrogen peroxide. METHODS AND RESULTS A suspension of Y. pestis CO92 (1.70 x 10(8) CFU) was dried on 10 different types of test surfaces and exposed to vapour-phase hydrogen peroxide fumigation for a contact time of 2 h. A significant reduction in the log10 CFU of Y. pestis on all 10 materials was observed between the controls evaluated after a 1 h drying time and unexposed controls evaluated after the decontamination run. Qualitative growth assessment showed that vapour-phase hydrogen peroxide exposure inactivated Y. pestis on all replicates of the 10 test materials as well as biological indicators up to 7 days postexposure. CONCLUSIONS Virulent Y. pestis CO92 is inactivated on polymers, steel, and glass surfaces when exposed to vapour-phase hydrogen peroxide without observable physical damage to the test materials. SIGNIFICANCE AND IMPACT OF THE STUDY This study provides information for using vapour-phase hydrogen peroxide as a practical process for the decontamination of virulent Y. pestis in circumstances where time-dependent attenuation/inactivation orliquid/heat decontamination may not be the most suitable approach.
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Affiliation(s)
- J V Rogers
- Battelle Biomedical Research Center, 505 King Avenue, JM-7, Columbus, OH 43201, USA.
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Rogers JV, Choi YW, Richter WR, Rudnicki DC, Joseph DW, Sabourin CLK, Taylor ML, Chang JCS. Formaldehyde gas inactivation of Bacillus anthracis, Bacillus subtilis, and Geobacillus stearothermophilus spores on indoor surface materials. J Appl Microbiol 2008; 103:1104-12. [PMID: 17897215 DOI: 10.1111/j.1365-2672.2007.03332.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIMS To evaluate the decontamination of Bacillus anthracis, Bacillus subtilis, and Geobacillus stearothermophilus spores on indoor surface materials using formaldehyde gas. METHODS AND RESULTS B. anthracis, B. subtilis, and G. stearothermophilus spores were dried on seven types of indoor surfaces and exposed to approx. 1100 ppm formaldehyde gas for 10 h. Formaldehyde exposure significantly decreased viable B. anthracis, B. subtilis, and G. stearothermophilus spores on all test materials. Significant differences were observed when comparing the reduction in viable spores of B. anthracis with B. subtilis (galvanized metal and painted wallboard paper) and G. stearothermophilus (industrial carpet and painted wallboard paper). Formaldehyde gas inactivated>or=50% of the biological indicators and spore strips (approx. 1x10(6) CFU) when analyzed after 1 and 7 days. CONCLUSIONS Formaldehyde gas significantly reduced the number of viable spores on both porous and nonporous materials in which the two surrogates exhibited similar log reductions to that of B. anthracis on most test materials. SIGNIFICANCE AND IMPACT OF THE STUDY These results provide new comparative information for the decontamination of B. anthracis spores with surrogates on indoor surfaces using formaldehyde gas.
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Affiliation(s)
- J V Rogers
- Battelle Memorial Institute, Columbus, OH 43201, USA.
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Park HS, Yang SW, Choi SU, Choi HG, Yong CS, Choi YW, Lee J. In vitro skin penetration and pharmacodynamic evaluation of prostaglandin E1 ethyl ester, a vasoactive prodrug of prostaglandin E1, formulated into alcoholic hydrogels. Pharmazie 2006; 61:933-7. [PMID: 17152986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Alcoholic hydrogels containing prostaglandin E1 ethyl ester (PGE1-EE), a prodrug of PGE1 as a therapeutic agent for erectile dysfunction, were formulated. The prodrug was stable against chemical hydrolysis in aqueous solution (pH 7.4), devoid of esterase activities, but was hydrolyzed to the parent drug in rat skin homogenates within 240 min. In the rat skin penetration study for 24 h, the steady-state flux values (microg/cm2/h) of PGE1-EE and PGE, from alcoholic hydrogels having 20% ethanol content were 7.6 and 1.8, respectively. PGE1-EE was superior to PGE, from a skin penetration point of view due to its increased lipophilicity. The fastest skin penetration rate was obtained for PGE1-EE in 20% alcoholic hydrogel together with limonene or cineole. These formulations increased the flux of PGE1-EE up to about 4-fold compared to control hydrogel in the absence of penetration enhancers. In the pharmacodynamic study using a cat, alcoholic hydrogel with limonene or cineole showed a significant effect in terms of increasing intracavernosal pressure compared to control hydrogel. Therefore, the transdermal alcoholic hydrogel formulation of PGE1-EE with limonene or cineole can be a promising transdermal delivery system to overcome inconvenience associated with frequent intracavernosal injections for the treatment of erectile dysfunction.
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Affiliation(s)
- H S Park
- Division of Pharmaceutical Sciences, College of Pharmacy, Chung-Ang University, Heuksuk-dong, Dongjak-gu, Seoul, South Korea
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Rogers JV, Ducatte GR, Choi YW, Early PC. A preliminary assessment ofBacillus anthracisspore inactivation using an electrochemically activated solution (ECASOL™). Lett Appl Microbiol 2006; 43:482-8. [PMID: 17032220 DOI: 10.1111/j.1472-765x.2006.02002.x] [Citation(s) in RCA: 15] [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: 11/29/2022]
Abstract
AIM To evaluate the efficacy of electrochemically activated solution (ECASOL) in decontaminating Bacillus anthracis Ames and Vollum 1B spores, with and without changing the source water hardness and final ECASOL pH. METHODS AND RESULTS Five different ECASOL formulations were generated, in which the source water hardness and final ECASOL pH were varied, resulting in cases where significant changes in free available chlorine (FAC) and oxidative-reduction potential (ORP) were observed. B. anthracis Ames and Vollum 1B spores were suspended in the various ECASOL formulations for 30 min, and decontamination efficacy was determined; calcium hypochlorite [5% high-test hypochlorite (HTH)] was used as a positive control. The five different ECASOL formulations yielded mean FAC levels ranging from 305 to 464 ppm, and mean ORP levels ranging from +826 to +1000 mV. Exposure to all the ECASOL formulations and 5% HTH resulted in >or=7.0 log reductions in both B. anthracis Ames and Vollum 1B spores. CONCLUSIONS The present testing demonstrated that ECASOL with a minimum of c. 300-ppm FAC levels and +800-mV ORP inactivated the B. anthracis spores in suspension, similar to 5% HTH. SIGNIFICANCE AND IMPACT OF THE STUDY These results provide information for decontaminating B. anthracis Ames and Vollum 1B spores in suspension using ECASOL.
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Affiliation(s)
- J V Rogers
- Battelle Memorial Institute, Columbus, OH, USA
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21
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Abstract
BACKGROUND Extracellular newly identified RAGE-binding protein (EN-RAGE) is a ligand of the receptor for advanced glycation endproducts (RAGE) and has been termed S100A12. The ligation of EN-RAGE with RAGE on the endothelium, mononuclear phagocytes and lymphocytes triggers cellular activation with the generation of the key proinflammatory mediators interleukin (IL)-1beta and tumour necrosis factor (TNF)-alpha. OBJECTIVES The aim of this study was to investigate the presence of RAGE and EN-RAGE, their spatial localization and their coexpression in leprosy lesions. METHODS Immunohistochemistry and confocal laser scanning microscopy were used to evaluate the expression of RAGE and EN-RAGE in leprosy. By enzyme-linked immunosorbent assay, RAGE and EN-RAGE were detected in the serum. RESULTS (1) In the multibacillary (MB) and paucibacillary (PB) groups, the level of RAGE production was significantly higher than in patients with atypical mycobacterial infection or sarcoidosis (P < 0.01). In the MB group, the production of RAGE was higher than in the PB group (P < 0.01), and it was higher in patients without the lepra reaction than in patients with the lepra reaction (P < 0.05). (2) In MB, PB and atypical mycobacterial infection, the level of EN-RAGE production was significantly higher than in sarcoidosis (P < 0.01). (3) In the confocal laser scanning microscopic examination, the RAGE and EN-RAGE proteins were detected in lepromatous leprosy. These proteins are spatially colocalized along the cell surface, which is in agreement with their receptor-ligand interaction. (4) A comparable amount of EN-RAGE was detected in the serum of the MB and PB groups. Patients with the reaction showed a higher level of EN-RAGE than patients without the reaction in leprosy. CONCLUSIONS Our data suggest that in leprosy, RAGE and EN-RAGE may be involved in the proinflammatory process rather than the antimycobacterial activity, especially during the lepra reaction. The blockade of the interaction of RAGE and EN-RAGE at the early stage of the inflammatory process may minimize the inflammatory response and consequent tissue damage or the sequelae of leprosy.
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Affiliation(s)
- M-H Kim
- Department of Dermatology, College of Medicine, DanKook University, Cheonan, Chungnam, Korea
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22
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Huh KC, Lee TH, Kim SM, Im EH, Choi YW, Kim BK, Jung DJ, Choi WJ, Kang YW. Intussuscepted sigmoid colonic lipoma mimicking carcinoma. Dig Dis Sci 2006; 51:791-5. [PMID: 16615005 DOI: 10.1007/s10620-006-3208-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2005] [Accepted: 04/04/2005] [Indexed: 02/08/2023]
Affiliation(s)
- K C Huh
- Department of Internal Medicine, Konyang University College of Medicine, Daejeon, Korea.
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23
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Rogers JV, Sabourin CLK, Choi YW, Richter WR, Rudnicki DC, Riggs KB, Taylor ML, Chang J. Decontamination assessment of Bacillus anthracis, Bacillus subtilis, and Geobacillus stearothermophilus spores on indoor surfaces using a hydrogen peroxide gas generator. J Appl Microbiol 2006; 99:739-48. [PMID: 16162224 DOI: 10.1111/j.1365-2672.2005.02686.x] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AIMS To evaluate the decontamination of Bacillus anthracis, Bacillus subtilis, and Geobacillus stearothermophilus spores on indoor surface materials using hydrogen peroxide gas. METHODS AND RESULTS Bacillus anthracis, B. subtilis, and G. stearothermophilus spores were dried on seven types of indoor surfaces and exposed to > or =1000 ppm hydrogen peroxide gas for 20 min. Hydrogen peroxide exposure significantly decreased viable B. anthracis, B. subtilis, and G. stearothermophilus spores on all test materials except G. stearothermophilus on industrial carpet. Significant differences were observed when comparing the reduction in viable spores of B. anthracis with both surrogates. The effectiveness of gaseous hydrogen peroxide on the growth of biological indicators and spore strips was evaluated in parallel as a qualitative assessment of decontamination. At 1 and 7 days postexposure, decontaminated biological indicators and spore strips exhibited no growth, while the nondecontaminated samples displayed growth. CONCLUSIONS Significant differences in decontamination efficacy of hydrogen peroxide gas on porous and nonporous surfaces were observed when comparing the mean log reduction in B. anthracis spores with B. subtilis and G. stearothermophilus spores. SIGNIFICANCE AND IMPACT OF THE STUDY These results provide comparative information for the decontamination of B. anthracis spores with surrogates on indoor surfaces using hydrogen peroxide gas.
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Affiliation(s)
- J V Rogers
- Battelle Memorial Institute, Columbus, OH, OH 43201, USA.
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24
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Jang M, Choi YW, Jeon SC, Park C, Yoon HJ. Endobronchial non-Hodgkin's lymphoma presenting as an isolated endobronchial mass. Clin Radiol 2006; 61:202-5. [PMID: 16439227 DOI: 10.1016/j.crad.2005.08.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2005] [Revised: 08/08/2005] [Accepted: 08/22/2005] [Indexed: 10/25/2022]
Affiliation(s)
- M Jang
- Department of Diagnostic Radiology, College of Medicine, Hanyang University, Seoul 133-792, South Korea
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25
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Abstract
The CT halo sign indicates ground glass attenuation surrounding a pulmonary nodule on CT. Although it was initially proposed as an early, specific finding of invasive pulmonary aspergillosis, it can be caused by many other pathological conditions such as infection, neoplastic and inflammatory diseases. The halo of ground glass attenuation pathologically represents pulmonary haemorrhage, tumour infiltration, or non-haemorrhagic inflammatory processes. Although non-specific, this sign is important because the clinical setting and associated radiological features may give a clue to the differential diagnosis. In this review, we demonstrate the spectrum of pulmonary diseases showing the "CT halo sign" on thin-section CT and discuss their radiological and clinical features.
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Affiliation(s)
- Y R Lee
- Department of Diagnostic Radiology, College of Medicine, Hanyang University, 17 Haengdang-dong, Sungdong-gu, Seoul 133-792, Korea
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26
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Abstract
Desmosomes are major intercellular adhesion junctions that provide stable cell-cell contacts and mechanical strength to epithelial tissues by anchoring cytokeratin intermediate filaments of adjacent cells. Desmogleins (Dsg) are transmembrane core components of the desmosomes, and belong to the cadherin supergene family of calcium-dependent adhesion molecules. Currently, there are three known isoforms of Dsgs (Dsg1, Dsg2, and Dsg3), encoded by distinct genes that are differentially expressed to determine their tissue specificity and differentiation state of epithelial cells. In this study, we cloned a novel mouse desmoglein gene sharing high homology to both mouse and human Dsg1. We propose to designate the previously published mouse Dsg1 gene as Dsg1-alpha and the new gene as Dsg1-beta. Analysis of intron/exon organization of the Dsg1-alpha and Dsg1-beta genes revealed significant conservation. The full-length mouse Dsg1-beta cDNA contains an open reading frame of 3180 bp encoding a precursor protein of 1060 amino acids. Dsg1-beta protein shares 94% and 76% identity with mouse Dsg1-alpha and human DSG1, respectively. RT-PCR using a multitissue cDNA panel demonstrated that while Dsg1-alpha mRNA was expressed in 15- to 17-day-old embryos and adult spleen and testis, Dsg1-beta mRNA was detected in 17-day-old embryos only. To assess subcellular localization, a FLAG-tagged expression construct of Dsg1-beta was transiently expressed in epithelial HaCaT cells. Dsg1-beta-FLAG was found at the cell-cell border and was recognized by the anti-Dsg1/Dsg2 antibody DG3.10. In summary, we have cloned and characterized a novel member of the mouse desmoglein gene family, Dsg1-beta.
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Affiliation(s)
- L Pulkkinen
- Department of Dermatology and Cutaneous Biology, Jefferson Medical College and Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA
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Abstract
PURPOSE To determine if daclizumab, an interleukin-2 antagonist, reduced the severity of reperfusion edema in lung transplant recipients. MATERIALS AND METHODS Eighty-five patients who were to undergo 86 consecutive lung transplants were included; 43 (50%) received daclizumab in addition to conventional immunosuppression. Patients were assigned to one of the following groups: control, right allograft; control, left allograft; daclizumab treated, right allograft; daclizumab treated, left allograft. Radiographs obtained in the first 5 postoperative days were evaluated for degree of edema. Mean daily edema scores and curves for control and daclizumab-treated groups were compared. Differences in survival at 1, 3, 6, and 12 months after transplantation, days of mechanical ventilation, and the ratio of arterial oxygenation to inspired oxygen level at 1, 3, and 5 days after transplantation were also compared. RESULTS Mean daily edema scores, edema curves, survival, days of mechanical ventilation, and ratio of arterial oxygenation to inspired oxygen level at 1 and 3 days after transplantation did not significantly differ between daclizumab-treated and control groups. A trend toward improved survival in the daclizumab-treated group was noted. CONCLUSION Daclizumab had no effect on the radiographic or immediate clinical manifestations of reperfusion edema in lung transplant recipients. Additional follow-up is needed to determine if daclizumab offers any long-term benefit in terms of reduced rejection rates or survival.
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Affiliation(s)
- E M Marom
- Department of Radiology, Duke University Medical Center, Box 3808, Durham, NC 27710, USA.
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Choi YW, McAdams HP, Jeon SC, Hong EK, Kim YH, Im JG, Lee SR. Idiopathic multilocular thymic cyst: CT features with clinical and histopathologic correlation. AJR Am J Roentgenol 2001; 177:881-5. [PMID: 11566694 DOI: 10.2214/ajr.177.4.1770881] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.5] [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: 11/18/2022]
Abstract
OBJECTIVE We performed this study to describe the CT features of idiopathic multilocular thymic cysts with clinical and histopathologic correlation. CONCLUSION Multilocular thymic cysts typically manifest on CT as unilocular or multilocular cystic thymic masses, often with soft-tissue attenuation components. CT cannot be used to distinguish neoplastic from nonneoplastic soft-tissue components.
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Affiliation(s)
- Y W Choi
- Department of Radiology, Hanyang University Hospital, 17 Haengdang-dong, Sungdong-ku, Seoul 133-792, South Korea
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Abstract
An ion selective electrode (ISE) for determining Cr(VI) using supported liquid membranes (SLMs) containing trioctylphosphine oxide (TOPO) was investigated in this study. TOPO, as a carrier, had a high selectivity for Cr(VI) against interfering ions such as sulfate, nitrate, nitrite, and chloride. The composition of the SLM was optimized as 0.193 g TOPO/1 mL NPOE (o-nitrophenyl octyl ether)/0.5 g poly (vinyl chloride) for detection of Cr(VI). The Cr(VI) concentration was measured in the range of 1 x 10(-3) to 1 x 10(-6) M with the SLM prepared in the study. It seemed that Cr(VI) was transported in the SLM as a triply charged ion indicated by the slope of the emf response. Selectivity coefficients and detection limits of Cr(VI) in the presence of interfering ions were determined experimentally using the fixed interference method.
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Affiliation(s)
- Y W Choi
- Department of Environmental Science and Engineering and Advanced Environmental Monitoring Research Center, Kwangju Institute of Science and Technology, Korea
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Abstract
Prurigo pigmentosa is a recurrent inflammatory dermatosis characterized by pruritic erythematous papules and reticulate hyperpigmentation that occurs most frequently in spring and summer. The etiology of prurigo pigmentosa remains unknown. Numerous authors have suggested that various contact allergens may be pathogenic or triggering factors, but nearly all attempts to identify an allergen have been unsuccessful. We report a case of prurigo pigmentosa induced by contact allergy to chrome in detergent, supporting the conclusion that contact allergens such as chrome may play a rôle in inducing prurigo pigmentosa.
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Affiliation(s)
- M H Kim
- Department of Dermatology, College of Medicine, Ewha Womans University, Seoul, Korea
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Kim YM, Lee YH, Shin SH, Kim EH, Choi YW, Lee KM, Park JH, Lee YU, Seel DJ, Kim MC. Expression of MAGE-1, -2, and -3 genes in gastric carcinomas and cancer cell lines derived from Korean patients. J Korean Med Sci 2001; 16:62-8. [PMID: 11289403 PMCID: PMC3054571 DOI: 10.3346/jkms.2001.16.1.62] [Citation(s) in RCA: 11] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
We investigated the expression of MAGE-1, -2, and -3 genes in tissues of 51 gastric carcinomas from Korean patients and in 11 gastric cancer cell lines established in Korea using reverse transcriptase-polymerase chain reaction along with immunohistochemical analyses and DNA sequencing. Among the 51 gastric carcinomas, MAGE-1, -2, and -3 genes were expressed in 16 (31%), 22 (43%), and 17 (33%), respectively, and 31 (60%) expressed at least one of the three genes. In contrast, none of the three MAGE genes were expressed in normal sites of gastric tissue from each cancer patient. Out of 11 gastric cancer cell lines, MAGE-1, -2, and -3 genes were expressed in two (18%), five (46%), and four (36%), respectively. According to the clinicopathological analysis, the expression of any of the three MAGE genes was not significantly correlated with several clinicopathological factors except histologic types (p= 0.067). Immunohistochemical analyses identified positive staining with monoclonal antibodies 77B and 57B specifically against MAGE-1 and -3 proteins, respectively, in nuclei and cytoplasms of cells in mRNA-positive tumor tissue. These findings suggest the possibility as a target for tumor-specific immunotherapy for Korean patients.
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Affiliation(s)
- Y M Kim
- Department of Internal Medicine, Presbyterian Medical Center, Jeonju, Korea
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Gavrilenko VP, Kim HJ, Ikutake T, Kim JB, Choi YW, Bowden MD, Muraoka K. Measurement method for electric fields based on stark spectroscopy of argon atoms. Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics 2000; 62:7201-7208. [PMID: 11102076 DOI: 10.1103/physreve.62.7201] [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] [Subscribe] [Scholar Register] [Received: 04/11/2000] [Indexed: 05/23/2023]
Abstract
We report the development of a method for the measurement of electric fields in glow discharge plasmas, based on Stark spectroscopy of argon atoms. The method is based on laser excitation of transitions in atomic argon. The key feature of the method is that the electric field is determined by matching experimentally obtained absorption spectra to theoretically calculated spectra. The dependence of the positions of energy levels of argon atoms on the strength of the electric field was calculated by solving the Schrodinger equation for the argon atom. Measurements of Stark spectra were made in the sheath region of a glow discharge using laser optogalvanic spectroscopy. The wavelength of the laser radiation was tuned to the transitions 4s-->nf (n=7,8,ellipsis,14) of the argon atom. For n=11, the lower limit for electric field measurements was estimated to be 14 V/mm.
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Affiliation(s)
- VP Gavrilenko
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga Fukuoka 816-8580, Japan
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Choi YW, Heath EI, Heitmiller R, Forastiere AA, Wu TT. Mutations in beta-catenin and APC genes are uncommon in esophageal and esophagogastric junction adenocarcinomas. Mod Pathol 2000; 13:1055-9. [PMID: 11048797 DOI: 10.1038/modpathol.3880194] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Beta-catenin plays important roles in both intercellular adhesion and signal transduction. Mutations in the beta-catenin or adenomatous polyposis coli (APC) gene can alter the degradation of beta-catenin and cause aberrant accumulation of beta-catenin result in increased transcription of target genes. The dysregulated APC/beta-catenin pathway has been recently discovered as an important mechanism of tumorigenesis in various cancers, but its role in esophageal adenocarcinomas is not clear. Therefore, we studied the beta-catenin gene mutation, allelic loss of chromosome 5q, and APC gene mutation in esophageal and esophagogastric junction adenocarcinomas. Two (2%) somatic mutations in exon 3 of the beta-catenin gene, encompassing the region for glycogen synthase kinase-3beta phosphorylation, were detected from 109 adenocarcinomas. Chromosomal allelic loss on 5q was frequent in 45.3% (44/97) of tumors. Only one missense mutation in the mutation cluster region of the APC gene was detected from 38 esophageal and esophagogastric junction adenocarcinomas with the 5q allelic loss. Our results based on partial screening mutational analyses indicate that mutations of APC/beta-catenin pathway, unlike in colorectal carcinoma, involve only a small subset of esophageal and esophagogastric junction adenocarcinoma.
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Affiliation(s)
- Y W Choi
- Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205-2196, USA
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Abstract
OBJECTIVE. We recently observed patients in whom the superior pericardial recess extended cephalad ("high-riding") into the right paratracheal region. In these patients, differentiation from mediastinal lymphadenopathy or mass was difficult. The purpose of this study was to assess the prevalence and CT features of the high-riding superior pericardial recess. CONCLUSION. Narrow-collimation CT with multiplanar reformations was useful for confidently diagnosing a high-riding superior pericardial recess and for distinguishing it from pathologic lesions.
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Affiliation(s)
- Y W Choi
- Department of Radiology, Hanyang University Hospital, 17 Haengdang-dong, Sungdong-ku, Seoul 1333-792, South Korea
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Abstract
Esophageal tubular duplication is a rare congenital anomaly. We experienced a patient with esophageal tubular duplication who presented with a swallowing difficulty which was aggravated after a gastrofiberscopic examination. Preoperative diagnosis was intramural hematoma of the esophagus due to trauma caused by endoscopy. Surgical specimen revealed that hematoma was located within a duplicated lumen of the esophagus. The radiologic and endoscopic findings are discussed in correlation with its pathology.
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Affiliation(s)
- Y S Kim
- Department of Diagnostic Radiology, Hanyang University Guri Hospital, Korea
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Cho SW, Song SH, Choi YW. Effects of solvent selection and fabrication method on the characteristics of biodegradable poly(lactide-co-glycolide) microspheres containing ovalbumin. Arch Pharm Res 2000; 23:385-90. [PMID: 10976588 DOI: 10.1007/bf02975452] [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: 11/28/2022]
Abstract
To demonstrate the effect of formulation conditions on the controlled release of protein from poly(lactide-co-glycolide) (PLGA) microspheres for use as a parenteral drug carrier, ovalbumin (OVA) microspheres were prepared using the W/O/W multiple emulsion solvent evaporation and extraction method. Methylene chloride or ethyl acetate was applied as an organic phase and poly(vinyl alcohol) as a secondary emulsion stabilizer. Low loading efficiencies of less than 20% were observed and the in vitro release of OVA showed a burst effect in all batches of different microspheres, followed by a gradual release over the next 6 weeks. Formulation processes affected the size and morphology, drug content, and the controlled release of OVA from PLGA microspheres.
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Affiliation(s)
- S W Cho
- Department of Pharmaceutics, College of Pharmacy, Chung-Ang University, Seoul, Korea
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Yi SW, Yune TY, Kim TW, Chung H, Choi YW, Kwon IC, Lee EB, Jeong SY. A cationic lipid emulsion/DNA complex as a physically stable and serum-resistant gene delivery system. Pharm Res 2000; 17:314-20. [PMID: 10801220 DOI: 10.1023/a:1007553106681] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.8] [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: 11/12/2022]
Abstract
PURPOSE To develop a non-viral gene delivery system in the form of an oil-in-water (o/w) lipid emulsion. METHOD Cationic lipid emulsions were formulated with soybean oil, 1,2-dioleoyl-sn-glycero-3-trimethylammonium-propane (DOTAP) as a cationic emulsifier and other co-emulsifiers. The physical characteristics of the lipid emulsion and the emulsion/DNA complex were determined. The in vitro transfection efficiency of the emulsion/DNA complex was determined in the presence of up to 90% serum. RESULTS The average droplet size and zeta potential of emulsions were ca. 180 nm and ca. +50 mV, respectively. Among the emulsions, a stable formulation was selected to form a complex with a plasmid DNA encoding chloramphenicol acetyltransferase. By increasing the ratio of emulsion to DNA. zeta-potential of the emulsion/DNA complex increased monotonously from negative to positive without any changes in the complex size. The complex was stable against DNase I digestion and an anionic poly-L-aspartic acid (PLAA). The complex delivered DNA into the cells successfully, and the transfection efficiency was not affected by complex formation time from 20 min to 2 h. More importantly, the cationic lipid emulsion facilitated the transfer of DNA in the presence of up to 90% serum. CONCLUSIONS The cationic lipid emulsion/DNA complex has physical stability and serum resistant properties for gene transfer.
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Affiliation(s)
- S W Yi
- Biomedical Research Center, Korea Institute of Science and Technology, Seoul
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Abstract
Bacillus amyloliquefaciens DS11 phytase (DS11 phytase) and Aspergillus ficuum phytase (AF phytase) activities were investigated by measuring the release of phosphate from phytate in animal feedstuff such as wheat bran, corn meal, soybean meal and rice flour at pH 5 and 7. In all the tested feedstuff, the enzymatic activity of DS11 phytase was more active at pH 7, but that of AF phytase was more active at pH 5. From these results, the phytate in the gastrointestinal tract could be degraded in the small intestine or stomach by DS11 or AF phytase, respectively. In conclusion, the results presented in this paper indicated that different combination ratios of DS11 and AF phytase, depending on the kind of feedstuff, might effectively induce more enzymatic activity both in the stomach and small intestine in terms of the pH of the gastrointestinal tract.
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Affiliation(s)
- S C Park
- Microbial Enzyme RU, Korea Research Institute of Bioscience & Biotechnology, Yusong, Taejon
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Abstract
Computed tomographic (CT) findings are described in three diabetic patients with central airways mucormycosis. The CT findings of the tracheobronchial mucormycosis include enhancing areas of mural thickening (n = 3), luminal narrowing (n = 3), intramural air (n = 3), low-attenuation nonenhancing bronchial wall thickening (n = 2), and bronchonodal fistula formation (n = 1). These CT features in a diabetic patient should raise a high index of suspicion for tracheobronchial mucormycosis, particularly when typical radiographic features of pulmonary tuberculosis are absent.
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Affiliation(s)
- K H Kim
- Department of Diagnostic Radiology, Hanyang University, Seoul, Korea
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Abstract
To propose a hypothesis about the embryogenesis of the subaortic left innominate vein, the authors reviewed the radiologic features of 14 patients diagnosed with subaortic left innominate vein made by computed tomography or magnetic resonance imaging scan. The authors retrospectively analyzed the level of the aortic arch, associated aortic arch anomalies, and the presence or absence of obliteration of the prevascular space. A high aortic arch was seen in 10 patients, five with a cervical, two with a right and, one with a double aortic arch. The prevascular space was occupied by the aortic arch, the great arteries, or both in all 10 patients with a high arch. In the remaining four patients with a normal aortic arch, the prevascular space was preserved, but abnormal elongation of the aortic segment between the left common carotid artery and the left subclavian artery was seen in three. The authors postulate that precardinal anastomosis can develop in any pathway where there is the available space. In the presence of abnormal elongation of the aortic arch and resultant widening of the subaortic space, the chance of the development of a subaortic left innominate vein increases.
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Affiliation(s)
- S H Kim
- Department of Radiology, Samsung Medical Center, College of Medicine, Sungkyun kwan University, Seoul, Korea
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Yi SW, Kim YH, Kwon IC, Chung JW, Park JH, Choi YW, Jeong SY. Stable lipiodolized emulsions for hepatoma targeting and treatment by transcatheter arterial chemoembolization. J Control Release 1998; 50:135-43. [PMID: 9685880 DOI: 10.1016/s0168-3659(97)00127-2] [Citation(s) in RCA: 31] [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: 02/08/2023]
Abstract
We attempted to develop lipiodolized emulsions that remain in the tumour for a long period, release drug in a sustained release pattern, and thus improve the conventional treatment of hepatocellular carcinoma (HCC) [1]. Polyoxyethylene derivatives of hydrogenated castor oil (HCO) were the most suitable emulsifiers in stabilizing emulsions containing Lipiodol as an oil phase. The length of ethylene oxide coupled to HCO rather than the hydrophilic-lipophilic balance (HLB) values was an important factor in preparing stable emulsions and in achieving sustained-release characteristics. When distilled water was replaced with Iopamiro, a heavy water soluble contrast medium with a specific gravity of 1.335, more stable lipiodolized emulsions with longer sustained release behaviour could be prepared with smaller amount of HCO. To study the in vivo stability of the w/o Lipiodol emulsion and the sustained-release characteristics of doxorubicin from the emulsion, the pharmacokinetic study was performed with normal dogs using transcatheter arterial chemoembolization technique. The area under the plasma concentration-time curve for the first eight hours (AUC0-8) and AUCtotal values of the stabilized emulsion were three to four times higher than those of the coarse emulsion prepared lacking HCO 60. From the in vitro and in vivo studies, Lipiodol based water in oil emulsion with HCO 60 containing doxorubicin showed higher stability and released doxorubicin in a sustained fashion.
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Affiliation(s)
- S W Yi
- Biomedical Research Centre, Korea Institute of Science and Technology, Seoul, Korea
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Abstract
This investigation tested the hypothesis that the removal of chondrocytes during endochondral fracture healing involves an ordered process of programmed cell death. To accomplish this, unilateral closed fractures were created in the femora of 36 Sprague-Dawley rats. The rats were killed in groups of four on days 1, 3, 7, 14, 21, 28, 42, 49, and 56 after fracture. The femora were embedded in paraffin and tested for expression of specific markers of fragmented DNA with use of a terminal deoxyuridyl transferase-mediated deoxyuridine triphosphate-biotin nick end labeling (TUNEL) technique. To determine the potential for transdifferentiation of chondrocytes to osteoblasts, calluses were also hybridized to detect expression of osteocalcin mRNA. Cell proliferation was assessed by an immunohistochemical detection method for proliferating cell nuclear antigen. A separate group of four rats was killed on day 28 to represent the later stage of the endochondral ossification, and the calluses were examined for cellular morphology with transmission electron microscopy. The results showed a coordination in both time and space of the activities of cellular proliferation and programmed cell death. Cell proliferation was most active in the earlier phases of fracture healing (days 1 through 14), although TUNEL expression was apparent in hypertrophic chondrocytes on day 14 after fracture and persisted until day 28. In the later stages of fracture healing (days 14 through 28), proliferating cell nuclear antigen was no longer synthesized in hard callus (intramembranous bone) and cell removal was the dominant activity in soft callus chondrocytes. Expression of osteocalcin mRNA was detected in osteoblasts but not in hypertrophic chondrocytes or in any other nonosteoblastic cell type. These findings support the hypothesis that the removal of chondrocytes during endochondral fracture healing is part of an ordered transition of tissue types in which the cellular mechanisms are genetically programmed to involve proliferation, maturation, and apoptotic cell death.
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Affiliation(s)
- F Y Lee
- Department of Orthopaedic Surgery, New Jersey Medical School, Newark, USA
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Im JG, Choi YW, Kim HD, Jeong YK, Han MC. Thin-section CT findings of the lungs: experimentally induced bronchial and pulmonary artery obstruction in pigs. AJR Am J Roentgenol 1996; 167:631-6. [PMID: 8751668 DOI: 10.2214/ajr.167.3.8751668] [Citation(s) in RCA: 15] [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: 02/02/2023]
Abstract
OBJECTIVE The purpose of this study was to investigate whether a mosaic pattern of lung attenuation, or lobular low attenuation, is revealed on CT imaging after induction of bronchial and pulmonary artery obstruction in pigs. MATERIALS AND METHODS Eight anesthetized and ventilated pigs, four for bronchial obstruction and four for pulmonary artery obstruction, were examined with thin-section CT. Bronchial obstruction was induced at the subsegmental level using 2- to 3-mm radiopaque silicon spheres at 14 sites. Pulmonary artery obstruction was induced at 11 sites by dislodging 2- to 3-mm silicon spheres at the level of the superior vena cava. CT scans were obtained at end expiration immediately after the obstruction in all pigs (n = 8) and after 1 day (n = 3), 3 days (n = 5), 7 days (n = 4), 14 days (n = 4), and 28 days (n = 3). RESULTS Of the 14 sites of bronchial obstruction, six sites (43%) on the immediate scans showed a lobular distribution of low attenuation distal to the spheres, which changed to atelectasis, consolidation, or normal on follow-up CT. Of the four sites that did not show changes in lung attenuation on immediate CT scans, two sites showed lobular low attenuation after 1 day. The mean attenuation value +/- SD for the lobular low attenuation was -737 H +/- 122 and that of the adjacent lung was -522 H +/- 53 (p = .0077). None of the pulmonary artery obstruction sites showed visible change in lung attenuation, and mean attenuation values for obstructed sites and unobstructed sites did not show significant differences when scanned as many as 28 days after the immediate scans. CONCLUSION Lobular low attenuation on thin-section CT was induced by bronchial obstruction, but we found no change in lung attenuation due to obstruction of the pulmonary arteries as many as 28 days after the immediate scans.
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Affiliation(s)
- J G Im
- Department of Radiology, Seoul National University College of Medicine, Korea
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Abstract
Costal cartilages of 10 controls and 12 patients with Tietze's syndrome (n = 6), deformed (exaggerated bowing) cartilage (n = 4), focal enlargement (n = 1), and cancer-invaded cartilage (n = 1) were examined with ultrasonography. In controls, ultrasonography detected 237 of 240 costal cartilages (98.8%) and 58 of 105 intercartilage connections (55%) with three variations. Correlation with CT was available in 7 patients (1 Tietze's syndrome, 4 deformities, 1 cartilage enlargement, and 1 cancer) among 8 patients whose CT results were known to the sonographer. Sonography showed normal (n = 4) or marginally blurred (n = 2) cartilages in 6 Tietze's syndromes. Ultrasonography is a promising technique in the examination of costal cartilages.
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Affiliation(s)
- Y W Choi
- Department of Radiology, Seoul City Boramae Hospital, Korea
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Ahn JM, Im JG, Ryoo JW, Kim SJ, Do YS, Choi YW, Oh YW, Yeon KM, Han MC. Thoracic manifestations of Behçet syndrome: radiographic and CT findings in nine patients. Radiology 1995; 194:199-203. [PMID: 7997553 DOI: 10.1148/radiology.194.1.7997553] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
PURPOSE To evaluate the radiographic and computed tomographic (CT) findings of patients with thoracic Behçet syndrome. MATERIALS AND METHODS Chest radiographs and CT scans of nine patients with thoracic Behçet syndrome were retrospectively reviewed. Findings were compared. RESULTS Radiographs of the nine patients showed mediastinal widening in five (56%), air-space consolidation in five (56%), and lung mass in three (33%). CT scans of the nine patients showed that mediastinal widening was due to thrombosis in four (44%) or narrowing of the superior vena cava in one [11%], which caused mediastinal edema; that air-space consolidation (seen on both radiographs and CT scans) was due to pulmonary hemorrhage or infarction in five (56%); and that lung mass was due to aneurysm of the right or left pulmonary artery in three (33%). In addition, CT scans showed hyperinflation in one patient. CONCLUSION Chest radiographic findings of thoracic Behçet syndrome are variable and nonspecific. CT can be helpful in the assessment of the syndrome by showing thrombosis of the superior vena cava and characteristic aneurysms of the pulmonary arteries.
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Affiliation(s)
- J M Ahn
- Department of Radiology, Seoul National University Hospital, Korea
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Kim G, Choi YW, Park PW, Chu HY, Lee EH, Arnold GB. Green's-function approach to the electronic structure of double-barrier quantum-well heterostructures. Phys Rev B Condens Matter 1994; 50:7582-7586. [PMID: 9974740 DOI: 10.1103/physrevb.50.7582] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
The partitioning of 10 imidazolidines in various liposome/buffer systems (logK'm) has been determined and compared to partitioning in the n-octanol/buffer system (logP'). The logK'm, which was generally greater than the logP', increased or decreased upon the addition of dicetylphosphate (DCP) or stearylamine (STA), respectively, to dimyristoylphosphatidylcholine (DMPC) liposomes. Quantitative correlations of alpha 2-adrenergic potencies of imidazolidines have been made by regression analyses with logP', logK'm, binding affinity, and intrinsic activity. Both central and peripheral potencies correlated with logK'm but not with logP'. Multiple regressions yielded improved predictable quantification of these potencies. Thus, the liposomal membrane system shows certain advantages over the n-octanol/buffer system for the prediction of biological activities of the imidazolidines.
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Affiliation(s)
- J A Rogers
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada
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Choi YW, Kotzin B, Lafferty J, White J, Pigeon M, Kubo R, Kappler J, Marrack P. A method for production of antibodies to human T-cell receptor beta-chain variable regions. Proc Natl Acad Sci U S A 1991; 88:8357-61. [PMID: 1656442 PMCID: PMC52507 DOI: 10.1073/pnas.88.19.8357] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [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] [Indexed: 12/28/2022] Open
Abstract
Mouse T-cell hybridomas bearing human V beta elements were produced by transfection of human/mouse hybrid T-cell receptor beta-chain genes into a mouse T-cell hybridoma lacking an endogenous beta-chain gene. These hybridomas were entirely mouse in origin except for the human V beta region. These cells were used to immunize mice against human V beta elements. Mouse monoclonal antibodies have thus been generated against human V beta 13.1 and -13.2. We expect that the method outlined in this paper will be useful in the production of monoclonal antibodies specific for other human V beta or V alpha elements.
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Affiliation(s)
- Y W Choi
- Howard Hughes Medical Institute, Denver, CO
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Abstract
The distribution of 2-imidazolines in neutral dimyristoylphosphatidylcholine (DMPC) liposomes, in negatively charged liposomes containing dicetylphosphate (DCP) or phosphatidylserine (PS), and in positively charged liposomes containing stearylamine (STA), has been investigated. Electrophoretic mobilities of multilamellar liposomes have also been measured as a function of drug concentration. Apparent equilibrium partition coefficients (log K'm) increased as a function of the DCP or PS concentration in DMPC liposomes whereas log K'm decreased with STA concentration, except for lofexidine and clonidine. Similarly, the electrokinetic parameters increased in DMPC liposomes that exhibited a small, positive surface charge, decreased in DMPC/cholesterol/DCP (7:1:2 mole ratio) liposomes, and increased in DMPC/STA (3:1 mole ratio) liposomes, except for clonidine which showed a decrease, as a function of the 2-imidazoline concentration. Surface potential change (delta psi o) due to drug inclusion in the liposomes obtained from theoretical considerations exhibited a positive linear relationship with log K'm. Values of delta psi o were greater but less sensitive to log K'm in negatively charged than in neutral or positively charged liposomes at 1 mM drug concentration. Likewise, surface charge densities varied in the same order as the surface potentials as a function of log K'm of the 2-imidazolines, except for clonidine and lofexidine. These data indicate the relative importance of the membrane surface characteristics on the partitioning behavior, and also possibly the membrane transport behavior, of the 2-imidazoline drugs.
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Affiliation(s)
- Y W Choi
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, Canada
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