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Yoon HY, Park IK, Lee JR, Lee SJ, Cho YJ, Do SJ, Cho HK, Jeong JJ. A Multiscale and Multiphysics PWR Safety Analysis at a Subchannel Scale. NUCL SCI ENG 2020. [DOI: 10.1080/00295639.2020.1727698] [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: 10/24/2022]
Affiliation(s)
- H. Y. Yoon
- Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon 34057, Korea
| | - I. K. Park
- Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon 34057, Korea
| | - J. R. Lee
- Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon 34057, Korea
| | - S. J. Lee
- Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon 34057, Korea
| | - Y. J. Cho
- Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon 34057, Korea
| | - S. J. Do
- Korea Atomic Energy Research Institute, 111 Daedeok-daero 989 Beon-gil, Yuseong-gu, Daejeon 34057, Korea
| | - H. K. Cho
- Seoul National University, Department of Nuclear Engineering, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Korea
| | - J. J. Jeong
- Pusan National University, School of Mechanical Engineering, 63-2 Busandaehak-ro, Geumjeong-gu, Busan 46241, Korea
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Hwang JY, Byun MS, Choe YM, Lee JH, Yi D, Yoon HN, Park IK, Lee YJ, Lee DY. 0249 Association Between Sleep-Wake Cycle And Brain Cortical Thickness In Young Adults. Sleep 2018. [DOI: 10.1093/sleep/zsy061.248] [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: 11/13/2022] Open
Affiliation(s)
- J Y Hwang
- Seoul National University College of Medicine, Seoul, KOREA, REPUBLIC OF
| | - M S Byun
- Institute of Human Behavioral Medicine, Medical Research Center Seoul National University, Seoul, KOREA, REPUBLIC OF
| | - Y M Choe
- Department of Psychiatry, Ulsan University Hospital, Ulsan, KOREA, REPUBLIC OF
| | - J H Lee
- Department of Psychiatry, Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - D Yi
- Institute of Human Behavioral Medicine, Medical Research Center Seoul National University, Seoul, KOREA, REPUBLIC OF
| | - H N Yoon
- Department of Biomedical Engineering, Seoul National University College of Medicine, Seoul, KOREA, REPUBLIC OF
| | - I K Park
- Center for Sleep and Chronobiology, Department of Psychiatry, Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - Y J Lee
- Center for Sleep and Chronobiology, Department of Psychiatry, Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
| | - D Y Lee
- Department of Psychiatry, Seoul National University Hospital, Seoul, KOREA, REPUBLIC OF
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Kim JH, Min BT, Park IK, Hong SW. Triggered Steam Explosions with Corium Melts of Various Compositions in a Narrow Interaction Vessel in the TROI Facility. NUCL TECHNOL 2017. [DOI: 10.13182/nt169-239] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- J. H. Kim
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
| | - B. T. Min
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
| | - I. K. Park
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
| | - S. W. Hong
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
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Park IK, Kim JH, Hong SH, Min BT, Hong SW, Song JH, Kim HD. An Investigation of the Particle Size Responses for Various Fuel-Coolant Interactions in the TROI Experiments. NUCL TECHNOL 2017. [DOI: 10.13182/nt08-a3912] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- I. K. Park
- Korea Atomic Energy Research Institute Thermal Hydraulics Safety Research Center, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - J. H. Kim
- Korea Atomic Energy Research Institute Thermal Hydraulics Safety Research Center, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - S. H. Hong
- Korea Atomic Energy Research Institute Thermal Hydraulics Safety Research Center, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - B. T. Min
- Korea Atomic Energy Research Institute Thermal Hydraulics Safety Research Center, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - S. W. Hong
- Korea Atomic Energy Research Institute Thermal Hydraulics Safety Research Center, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - J. H. Song
- Korea Atomic Energy Research Institute Thermal Hydraulics Safety Research Center, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - H. D. Kim
- Korea Atomic Energy Research Institute Thermal Hydraulics Safety Research Center, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
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Kim JH, Min BT, Park IK, Hong SW. Triggered Steam Explosions with the Corium Melts of Various Compositions in a Two-Dimensional Interaction Vessel in the TROI Facility. NUCL TECHNOL 2017. [DOI: 10.13182/nt11-a13314] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- J. H. Kim
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
| | - B. T. Min
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
| | - I. K. Park
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
| | - S. W. Hong
- Korea Atomic Energy Research Institute, Thermal Hydraulics Safety Research Division 150 Dukjin-Dong, Yusong, Taejon 305-353, Korea
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Affiliation(s)
- J. H. Kim
- Korea Atomic Energy Research Institute Thermal-Hydraulics and Safety Research Division, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - I. K. Park
- Korea Atomic Energy Research Institute Thermal-Hydraulics and Safety Research Division, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - B. T. Min
- Korea Atomic Energy Research Institute Thermal-Hydraulics and Safety Research Division, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - S. W. Hong
- Korea Atomic Energy Research Institute Thermal-Hydraulics and Safety Research Division, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - S. H. Hong
- Korea Atomic Energy Research Institute Thermal-Hydraulics and Safety Research Division, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - J. H. Song
- Korea Atomic Energy Research Institute Thermal-Hydraulics and Safety Research Division, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
| | - H. D. Kim
- Korea Atomic Energy Research Institute Thermal-Hydraulics and Safety Research Division, 150 Dukjin-Dong Yusong, Taejon 305-353, Republic of Korea
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Hwang Y, Park IK, Kang CH, Kim YT. 156-I * A NOVEL TECHNIQUE USING PREOPERATIVE LIPIODOL MARKING AND FLUOROSCOPY TO IDENTIFY AN ADEQUATE RESECTION MARGIN IN THORACOSCOPIC SEGMENTECTOMY FOR DEEP SEATED NON-PALPABLE GROUND-GLASS NODULES. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu276.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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8
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Seon Kim H, Hwang Y, Jeon JH, Park IK, Kang CH, Kim YT. P-147 * PREOPERATIVE PERCUTANEOUS LOCALIZATION FOR THORACOSCOPIC RESECTION OF SMALL PULMONAY NODULES: HOOK WIRE VERSUS RADIO OPAQUE DYE INJECTION. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu167.147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Hwang Y, Kang CH, Sohn SH, Kim HS, Jeon JH, Park IK, Kim YT. F-113 * COMPARISON OF THORACOSCOPIC SEGMENTECTOMY AND THORACOSCOPIC LOBECTOMY IN PATIENTS WITH NON-SMALL-CELL LUNG CANCER: A PROPENSITY SCORE MATCHING STUDY. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu167.113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Han KN, Kang CH, Park IK, Lee HJ, Kim YT. P-136 * THE PROGNOSTIC IMPACT OF THORACIC LYMPHADENECTOMY DURING PULMONARY METASTASECTOMY IN CLINICALLY LYMPH NODE-NEGATIVE PULMONARY METASTASIS. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu167.136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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11
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Kang CH, Hwang Y, Park IK, Kim YT. V-011 * ROBOTIC-ASSISTED THYMO-THYMECTOMY IN A PATIENT WITH COMBINED THYMOMA AND THYMIC CYSTS. Interact Cardiovasc Thorac Surg 2014. [DOI: 10.1093/icvts/ivu167.11] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Cho YJ, Ryu H, Lee J, Park IK, Kim YT, Lee YH, Lee H, Hong DM, Seo JH, Bahk JH, Jeon Y. A randomised controlled trial comparing incentive spirometry with the Acapella
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device for physiotherapy after thoracoscopic lung resection surgery. Anaesthesia 2014; 69:891-8. [DOI: 10.1111/anae.12750] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/24/2014] [Indexed: 11/30/2022]
Affiliation(s)
- Y. J. Cho
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - H. Ryu
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - J. Lee
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - I. K. Park
- Department of Thoracic and Cardiovascular Surgery Seoul National University Hospital Seoul South Korea
| | - Y. T. Kim
- Department of Thoracic and Cardiovascular Surgery Seoul National University Hospital Seoul South Korea
| | - Y. H. Lee
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - H. Lee
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - D. M. Hong
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - J. H. Seo
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - J. H. Bahk
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
| | - Y. Jeon
- Department of Anaesthesiology and Pain Medicine Seoul National University Hospital Seoul South Korea
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Kang CH, Hwang YH, Kim HS, Jheon JH, Han KN, Park IK, Kim YT. 300 * LONG-TERM SURVIVAL AFTER MINIMALLY INVASIVE OESOPHAGECTOMY FOR OESOPHAGEAL CANCER IS COMPARABLE TO OPEN OESOPHAGECTOMY: A PROPENSITY SCORE-MATCHED STUDY. Interact Cardiovasc Thorac Surg 2013. [DOI: 10.1093/icvts/ivt372.300] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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14
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Kim SH, Han KN, Kang CH, Park IK, Kim YT. 165 * UNIPORTAL THORACOSCOPIC BULLECTOMY FOR RECURRENT PRIMARY SPONTANEOUS PNEUMOTHORAX: IS UNIPORTAL SURGERY WITHOUT THE USE OF SPECIAL DEVICES FEASIBLE? Interact Cardiovasc Thorac Surg 2013. [DOI: 10.1093/icvts/ivt372.165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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15
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Hwang Y, Jeon JH, Kim HS, Park IK, Kang CH, Kim YT. 204 * SHORT- AND LONG-TERM SURVIVAL ACCORDING TO THE EXTENT OF PULMONARY RESECTION IN GERIATRIC LUNG CANCER PATIENTS. Interact Cardiovasc Thorac Surg 2013. [DOI: 10.1093/icvts/ivt372.204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Park IK, Kim JH, Hong SH, Hong SW. The Triggerability and Explosion Potentials of Reactor Core Melt at Fuel Coolant Interactions. NUCL TECHNOL 2013. [DOI: 10.13182/nt13-a16981] [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: 11/12/2022]
Affiliation(s)
- I. K. Park
- Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu Daejeon, 305-353, Republic of Korea
| | - J. H. Kim
- Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu Daejeon, 305-353, Republic of Korea
| | - S. H. Hong
- Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu Daejeon, 305-353, Republic of Korea
| | - S. W. Hong
- Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu Daejeon, 305-353, Republic of Korea
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Lee HJ, Nguyen YTC, Muthiah M, Vu-Quang H, Namgung R, Kim WJ, Yu MK, Jon S, Lee IK, Jeong YY, Park IK. MR traceable delivery of p53 tumor suppressor gene by PEI-functionalized superparamagnetic iron oxide nanoparticles. J Biomed Nanotechnol 2012; 8:361-71. [PMID: 22764405 DOI: 10.1166/jbn.2012.1407] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Cancer gene therapy involves the replacement of missing or altered genes with healthy ones. In this paper, we have proposed tumor suppressor gene-carrying superparamagnetic iron oxide nanoparticles (SPIONs) for anti-cancer gene therapy. Thermally crosslinked SPIONs (TCL-SPIONs) were conjugated with branched polyethylenimine (PEI 1800 Da) by EDC-NHS chemistry for p53 plasmid DNA delivery. The morphology of the bPEI conjugated TCL-SPIONs (bPEI-TCL-SPION) and pDNA-loaded bPEI-TCL-SPION nanoparticles was measured using transmission electron microscopy (TEM). The particle sizes of the pDNA-loaded bPEI-TCL-SPION nanoparticles were also confirmed by dynamic light scattering, and ranged from 100 to 130 nm, depending on the molar charge ratio. The fluorescently labeled pDNA was complexed with bPEI-TCL-SPION and its intracellular internalization was investigated using confocal microscopy. The p53 plasmid-loaded bPEI-TCL-SPION nanoparticles achieved significantly higher p53 tumor suppressor gene expression and cellular viability compared to positive controls. The expressed wild-type p53 protein suppressed tumor cell proliferation as compared to the mutant control. When transgene expression of the p53 tumor suppressor gene was evaluated at the mRNA level and quantified using real-time PCR, the results were highly dependent on the molar charge ratio (N/P) as well as the cancer cell type. SPIONs internalized within cancer cells were tracked by magnetic resonance (MR) imaging. It was concluded that bPEI-TCL-SPION could be used as efficient gene delivery carriers that can be tracked by MR imaging.
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Affiliation(s)
- H J Lee
- Department of Biomedical Sciences, Research Institute of Medical Sciences, Chonnam National University Medical School, Gwangju 501-746, South Korea
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Haam SJ, Park IK, Paik HC, Kim DJ, Lee DY, Lee JG, Bae MK, Chung KY. T-stage of non-small cell lung cancer directly invading an adjacent lobe. Eur J Cardiothorac Surg 2012; 42:807-10; discussion 810-1. [DOI: 10.1093/ejcts/ezs171] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Haam SJ, Lee JG, Kim DJ, Chung KY, Park IK. Oesophagography and oesophagoscopy are not necessary in patients with spontaneous pneumomediastinum. Emerg Med J 2011; 27:29-31. [PMID: 20029003 DOI: 10.1136/emj.2008.065565] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Because the condition is rare, the proper assessment of spontaneous pneumomediastinum (SPM) remains controversial. The purpose of this study was to determine whether additional oesophageal investigations beyond chest x ray and chest computed tomography (CT) scan are necessary for the diagnosis of SPM. METHODS The medical records of 25 patients diagnosed and treated for SPM from March 1986 to December 2007 were retrospectively reviewed. RESULTS There were 22 men and 3 women, with a median age of 19 years (range 15-57 years). All patients received chest x rays, which revealed air shadows within the mediastinum or subcutaneous emphysema in 24 patients. Twenty-two patients underwent chest CT scans, which showed pneumomediastinum in all cases. Oesophagography was performed in 14 patients and oesophagoscopy in three. All oesophagographies and oesophagoscopies were clear. Despite conservative treatment, no patients developed mediastinitis or complications associated with oesophageal injury. CONCLUSIONS Chest x ray and CT scan are sufficient to diagnose SPM. Additional diagnostic assessments such as oesophagography and oesophagoscopy are not necessary in patients without evidence of mediastinitis or a history of oesophageal injury.
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Affiliation(s)
- S J Haam
- 134 Sinchon-dong, Seodaemun-gu, CPO Box 8044, Seoul 120-752, South Korea;
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Park IK, Kim TH, Shin YH. 16. The Effective Steroid Dose of Caudal Epidural Injection With Unilateral Epidural Catheter Position in Patients With Symptomatic Herniated Nucleus Pulposus. Reg Anesth Pain Med 2008. [DOI: 10.1136/rapm-00115550-200809001-00051] [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: 11/03/2022]
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Kwon EJ, Bergen JM, Park IK, Pun SH. Peptide-modified vectors for nucleic acid delivery to neurons. J Control Release 2008; 132:230-5. [PMID: 18627784 DOI: 10.1016/j.jconrel.2008.06.012] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2008] [Revised: 06/05/2008] [Accepted: 06/13/2008] [Indexed: 12/26/2022]
Abstract
Neuron-targeted nucleic acid delivery systems are important technologies for realizing the potential of gene therapy for nervous system disorders. However, neurons are difficult cells to transfect using non-viral vectors due in part to the specific and unique delivery challenges present in these cells. We have investigated several bioactive peptides for their ability to assist in overcoming delivery barriers in mammalian cells. We summarize here our recent progress in developing and applying peptide-modified polycations for nucleic acid delivery. In addition, we present data demonstrating the potential of using multicomponent, peptide-modified polycations for nucleic acid delivery to neurons.
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Affiliation(s)
- E J Kwon
- Department of Bioengineering, University of Washington, Seattle WA 98195, USA
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Affiliation(s)
- I. K. Park
- a Tenneco Chemicals, Inc. , P.O. Box 129, Flemington, New Jersey, 08822
| | - D. W. Riley
- a Tenneco Chemicals, Inc. , P.O. Box 129, Flemington, New Jersey, 08822
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Cho CS, Seo SJ, Park IK, Kim SH, Kim TH, Hoshiba T, Harada I, Akaike T. Galactose-carrying polymers as extracellular matrices for liver tissue engineering. Biomaterials 2006; 27:576-85. [PMID: 16084586 DOI: 10.1016/j.biomaterials.2005.06.008] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.2] [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: 03/09/2005] [Accepted: 06/20/2005] [Indexed: 11/29/2022]
Abstract
Extracellular matrix (ECM) plays important roles in tissue engineering because cellular growth and differentiation, in the two-dimensional cell culture as well as in the three-dimensional space of the developing organism, require ECM with which the cells can interact. Especially, the bioartificial liver-assist device or regeneration of the liver-tissue substitutes for liver tissue engineering requires a suitable ECM for hepatocyte culture because hepatocytes are anchorage-dependent cells and are highly sensitive to the ECM milieu for the maintenance of their viability and differentiated functions. Galactose-carrying synthetic ECMs derived from synthetic polymers and natural polymers bind hepatocytes through a receptor-mediated mechanism, resulting in enhanced hepatocyte functions. Attachment and functions of hepatocytes were affected by physico-chemical properties including ECM geometry as well as the type, density and orientation of galactose. Also, cellular environment, medium composition and dynamic culture system influenced liver-specific functions of hepatocytes beside ECM.
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Affiliation(s)
- C S Cho
- School of Agricultural Biotechnology, Seoul National University, Seoul 151-742, South Korea
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Kim JG, Sohn SK, Kim DH, Baek JH, Jeon SB, Chae YS, Lee KB, Park JS, Sohn JH, Kim JC, Park IK. Phase II study of concurrent chemoradiotherapy with capecitabine and cisplatin in patients with locally advanced squamous cell carcinoma of the head and neck. Br J Cancer 2005; 93:1117-21. [PMID: 16251869 PMCID: PMC2361495 DOI: 10.1038/sj.bjc.6602849] [Citation(s) in RCA: 18] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
We aimed to evaluate the efficacy and safety of concurrent chemoradiotherapy with capecitabine and cisplatin in patients with locally advanced squamous cell carcinoma of the head and neck (SCCHN). In total, 37 patients with stage III or IV SCCHN were enrolled on the study. The chemotherapy consisted of two cycles of intravenous cisplatin of 80 mg m−2 on day 1 and oral capecitabine 825 mg m−2 twice daily from day 1 to day 14 at 3-week intervals. The radiotherapy (1.8–2.0 Gy 1 fraction day−1 to a total dose of 70–70.2 Gy) was delivered to the primary tumour site and neck. The primary tumour sites were as follows: oral cavity (n=6), oropharynx (n=11), hypopharynx (n=8), larynx (n=3), nasopharynx (n=6), and paranasal sinus (n=3). After the chemoradiotherapy, 29 complete responses (78.4%) and 6 partial responses (16.2%) were confirmed. Grade 3 or 4 neutropenia occurred only in two patients, plus grade 3 febrile neutropenia was observed only in one patient. At a median follow-up duration of 19.8 months, the estimated overall survival and progression-free survival rate at 2-year was 76.8 and 57.9%, respectively. Concurrent chemoradiotherapy with capecitabine and cisplatin was found to be well tolerated and effective in patients with locally advanced SCCHN.
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Affiliation(s)
- J G Kim
- Department of Oncology/Hematology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - S K Sohn
- Department of Oncology/Hematology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - D H Kim
- Department of Oncology/Hematology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - J H Baek
- Department of Oncology/Hematology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - S B Jeon
- Department of Oncology/Hematology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - Y S Chae
- Department of Oncology/Hematology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - K B Lee
- Department of Oncology/Hematology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - J S Park
- Department of Otorhinolaryngology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
- Department of Otorhinolaryngology, Kyungpook National University Hospital, 50 Samduck 2-Ga, Jung-Gu, Daegu 700-712, Korea; E-mail:
| | - J H Sohn
- Department of Otorhinolaryngology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - J C Kim
- Department of Radiation Oncology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
| | - I K Park
- Department of Radiation Oncology, Kyungpook National University, College of Medicine, Kyungpook National University Hospital, Daegu, Korea
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Kim SK, Park IK, Park BH, Park W, Lee HS, Kim TH, Jun JB, Bae SC, Yoo DH, Uhm WS. A case report: isolated a heavy chain monoclonal gammopathy in a patient with polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy and skin change syndrome. Int J Clin Pract 2005:26-30. [PMID: 15875614 DOI: 10.1111/j.1368-504x.2005.00343.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
A 45-year-old South-Korean man presented with abdominal distension, progressive paresthesia and motor weakness of both lower extremities. Our case was identified as polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy and skin change (POEMS) syndrome based on diagnostic criteria. Circulating M components of POEMS syndrome consist mainly of IgG or IgA-lambda and rarely IgM-lambda, IgG-kappa or isolated light chains. In this case, the M-band on serum protein electrophoresis and isolated IgA heavy chain on serum immunofixation electrophoresis were demonstrated, but there was no abnormal light chain. We suggest that this case may be associated with a pattern of abnormal secretion of monoclonal protein or a coincidence of a heavy chain disease in POEMS syndrome, even though the latter possibility may be very rare.
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Affiliation(s)
- S K Kim
- Department of Internal Medicine, The Hospital for Rheumatic Diseases, Seoul, South Korea
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26
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Baek EJ, Park IK. Influence of air exposure and storage condition on serum ionized magnesium level. Scand J Clin Lab Invest 2005; 65:107-10. [PMID: 16025833 DOI: 10.1080/00365510510013460] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The aim of this study was to evaluate whether reporting serum level of ionized magnesium (iMg) is appropriate when affected by various conditions such as exposure to air and delayed measurement. Serum levels of pH, iMg and normalized magnesium (nMg, normalized or adjusted concentration of iMg to pH 7.40) from 28 inpatients were measured at intervals of 3 min after exposing the samples to air at room temperature. Serum from 30 inpatients was stored in closed tubes at 4 degrees C and -20 degrees C and iMg and nMg levels were measured after 2 days. It was found that serum iMg and nMg concentrations exposed to air were decreased by 0.0023 mmol/l and 0.0001 mmol/l per minute, respectively. nMg did not display any significant changes compared with iMg at 0 min, whereas iMg showed significant changes, which exceeded between-day precision. For the stored serum, only iMg of serum at -20 degrees C showed no statistically significant changes (p = 0.169). It is concluded that to report the result as iMg, the sample should be kept anaerobically, and if exposed to air, the result should be reported as nMg. For storage, iMg of serum kept anaerobically at -20 degrees C is reliable.
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Affiliation(s)
- E J Baek
- Department of Laboratory Medicine, Hanyang University College of Medicine, Seoul, Korea
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27
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Kim JG, Baek JH, Sohn SK, Kim DH, Jeon SB, Park JS, Sohn JH, Kim JC, Park IK, Park KU. Phase II study of concurrent chemoradiotherapy with capecitabine and cisplatin for locally advanced head and neck cancer: A preliminary result. J Clin Oncol 2005. [DOI: 10.1200/jco.2005.23.16_suppl.5587] [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: 11/20/2022] Open
Affiliation(s)
- J. G. Kim
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - J. H. Baek
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - S. K. Sohn
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - D. H. Kim
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - S. B. Jeon
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - J. S. Park
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - J. H. Sohn
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - J. C. Kim
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - I. K. Park
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
| | - K. U. Park
- Kyungpook National Univ Hosp, Daegu, Republic of Korea; Dongguk Univ Coll of Medicine, Gyeongju, Republic of Korea
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Park IK, Jiang HL, Yun CH, Choi YJ, Kim SJ, Akaike T, Kim SI, Cho CS. Release of Newcastle Disease Virus Vaccine from Chitosan Microspheres In vitro and In vivo. Asian Australas J Anim Sci 2004. [DOI: 10.5713/ajas.2004.543] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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29
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Park IK, Kim TH, Kim SI, Park YH, Kim WJ, Akaike T, Cho CS. Visualization of transfection of hepatocytes by galactosylated chitosan-graft-poly(ethylene glycol)/DNA complexes by confocal laser scanning microscopy. Int J Pharm 2003; 257:103-10. [PMID: 12711166 DOI: 10.1016/s0378-5173(03)00133-9] [Citation(s) in RCA: 39] [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: 10/27/2022]
Abstract
Dual-labeled galactosylated chitosan-graft-poly(ethylene glycol) (PEG) (GCP)/DNA complexes were prepared and their hepatocyte-specific delivery and cellular distribution were investigated by confocal laser scanning microscopy (CLSM). The complexes were transfected into hepatocyte through specific interaction of galactose moiety of the GCP and asialoglycoprotein receptors (ASGPR) of the hepatocytes. The GCP/DNA complexes taken up by the hepatocytes were rapidly released into the cytoplasm, but nuclear trafficking of the released complexes was slow and rate-limiting process. The more efficient transfection of the complex occurred in the human-derived HepG2 cells than in primary hepatocytes.
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Affiliation(s)
- I K Park
- School of Agricultural Biotechnology, Seoul National University, Suwon 441-744, South Korea
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30
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Park IK, Ihm JE, Park YH, Choi YJ, Kim SI, Kim WJ, Akaike T, Cho CS. Galactosylated chitosan (GC)-graft-poly(vinyl pyrrolidone) (PVP) as hepatocyte-targeting DNA carrier. Preparation and physicochemical characterization of GC-graft-PVP/DNA complex (1). J Control Release 2003; 86:349-59. [PMID: 12526830 DOI: 10.1016/s0168-3659(02)00365-6] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.1] [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: 10/27/2022]
Abstract
Galactosylated chitosan was conjugated with poly(vinyl pyrrolidone) (PVP) as a hydrophilic group. The complex formation of GC-graft-PVP (GCPVP)/DNA complexes was confirmed by agarose gel electrophoresis. The morphology of the complex observed by atomic force microscopy had a compact and spherical shape, around 40 nm particle sizes at a charge ratio of 3. The binding strength of GCPVP 10K/DNA complex measured by ethidium bromide binding assay was superior to that of the GCPVP 50K/DNA one, probably attributable to its higher flexibility due to the smaller size, whereas the DNase I protection of GCPVP 10K/DNA complex was inferior to that of the GCPVP 50K/DNA one. This indicated that effective complex formation required both higher binding strength and minimal molecular weight of polycation enough to induce the condensation of DNA. The DNA-binding property of GCPVP mainly depended on the molecular weight of chitosan and composition of PVP.
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Affiliation(s)
- I K Park
- School of Agricultural Biotechnology, Seoul National University, Suwon 441-744, South Korea
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31
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Kim JM, Bak KH, Kim CH, Park IK, Oh SJ, Choi HK. The role of endothelin-1 as predictor of the symptomatic vasospasm in acute stage of subarachnoid haemorrhage. Acta Neurochir Suppl 2002; 77:77-9. [PMID: 11563314 DOI: 10.1007/978-3-7091-6232-3_17] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- J M Kim
- Department of Neurosurgery, Hanyang University Kuri Hospital, Kuri, Korea
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32
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Cho CS, Cho KY, Park IK, Kim SH, Sasagawa T, Uchiyama M, Akaike T. Receptor-mediated delivery of all trans-retinoic acid to hepatocyte using poly(L-lactic acid) nanoparticles coated with galactose-carrying polystyrene. J Control Release 2001; 77:7-15. [PMID: 11689255 DOI: 10.1016/s0168-3659(01)00390-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
All trans-retinoic acid (RA)-loaded poly(L-lactic acid) (PLA) nanoparticles coated with galactose-carrying polymer, as hepatocyte-specific targeting material using galactose ligands as recognition signals to asialoglycoprotein receptors were prepared by the diafiltration method. Effects of released RA from its loaded nanoparticles on morphology and DNA synthesis of hepatocytes were studied. Receptor-mediated endocytosis of the nanoparticles was checked by fluorescence and confocal laser microscopy. It was found that the shapes of most hepatocytes attached onto polystyrene dish precoated with collagen solution were flat and spreading at low concentration of RA for the RA-loaded nanoparticles, whereas their shapes were round at even low concentration of RA when RA was mixed with the nanoparticles. From the fluorescence and confocal laser microscopic studies, it was suggested that the nanoparticles coated with galactose-carrying polymers were internalized by the hepatocytes through the receptor-mediated mechanism. The RA-loaded nanoparticles were more potent stimulators of hepatocyte DNA synthesis than the free RA system in the presence of epidermal growth factor (EGF) owing to the controlled release of RA from the RA-loaded nanoparticles.
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Affiliation(s)
- C S Cho
- School of Agricultural Biotechnology, Seoul National University, 103 Serdun-dong, Kwonsun-gu, Suwon 441-744, South Korea.
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Park IK, Kim TH, Park YH, Shin BA, Choi ES, Chowdhury EH, Akaike T, Cho CS. Galactosylated chitosan-graft-poly(ethylene glycol) as hepatocyte-targeting DNA carrier. J Control Release 2001; 76:349-62. [PMID: 11578748 DOI: 10.1016/s0168-3659(01)00448-5] [Citation(s) in RCA: 168] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lactobionic acid bearing galactose group was coupled with chitosan for liver specificity, and poly(ethylene glycol) (PEG) was grafted to galactosylated chitosan (GC) for stability in water and enhanced cell permeability. Complex formation of galactosylated chitosan-graft-PEG (GCP)/DNA complexes was confirmed by agarose gel electrophoresis. Compared to GC/DNA complex, the stability of GCP/DNA complex could be enhanced. Particle sizes of GCP/DNA complexes decreased as the charge ratio of GCP to DNA increased and had a minimum value around 27 nm at the charge ratio of 5. Conformational change of DNA did not occur after complex formation with GCP compared to conformation of DNA itself. GCP/DNA complexes were only transfected into Hep G2 having asialoglycoprotein receptors (ASGR), indicative of specific interaction of ASGR on cells and galactose ligands on GCP.
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Affiliation(s)
- I K Park
- School of Agricultural Biotechnology, Seoul National University, 441-744, Suwon, South Korea
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Abstract
PURPOSE To evaluate the clinical and ocular manifestations of Takayasu arteritis and the fundus fluorescein angiography (FFA) characteristics of Takayasu retinopathy (TR). PATIENTS AND METHODS Medical records and fundus fluorescein angiograms of 156 eyes of 78 patients with Takayasu arteritis were reviewed. Fundus FA using a wide-field fundus camera (60 degrees) was performed in 19 patients, and conventional angiography or spiral computed tomographic angiography was performed in all 78 patients. RESULTS The series included 67 female and 11 male patients; mean age at time of diagnosis was 26.7 years (range, 4-61 years). Hypertension was found in 44 (56.4%) patients, ischemic cerebrovascular symptoms in 18 (23.1%) patients, and amaurosis fugax in 20 (25.6%) patients. On fundus examination, no retinopathy was found in 87 (55.8%) eyes; hypertensive retinopathy was found in 48 (30.8%) eyes; and TR was found in 21 (13.5%) eyes. Patients with TR had carotid artery or aortic arch involvement, and patients with hypertensive retinopathy had involvement of the descending aorta or renal artery and sparing of the carotids. Best-corrected visual acuity in TR Stage 1 to 3 ranged from 20/15 to 20/30, but in Stage 4, it ranged from 20/200 to hand motions because of secondary ocular complications. On FFA, the arm-to-retina circulation time was prolonged in all 21 eyes with TR (mean, 22.7+/-8.9 seconds), but only 14 eyes showed delayed arteriovenous filling time, which was mainly found in chronic, moderate to severe TR, Stage 3 or 4. Arteriovenous anastomosis was found in all 12 eyes with Stage 3 and 4 TR. CONCLUSIONS Delayed arm-to-retina circulation time is shown in all cases of TR, but delayed arteriovenous filling time is mostly found in moderate and severe TR. During ophthalmic examination, the delay of arteriovenous filling time and formation of arteriovenous anastomosis must be examined carefully to prevent visual deterioration.
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Affiliation(s)
- Y S Chun
- Department of Ophthalmology, Seoul National University College of Medicine, Korea
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Abstract
Effects of 6-aminonicotinamide (6-AN) on the levels of proteins, metabolites and enzyme activities in the plasma of Japanese quail were investigated. The concentrations of soluble proteins in the pectoral and hindlimb muscle of the 6-AN treated and the pair-fed groups were significantly reduced compared to the control group. In the plasma, the levels of total proteins and albumin were not affected, but the levels of globulin were significantly lower than those of the control and pair-fed groups. In contrast, the levels of glucose and creatine were significantly elevated. Cellulose acetate gel electrophoresis showed that 6-AN induced a new synthesis of prealbumin and also increased the levels of beta-globulin relative to the control and pair-fed groups. In contrast, the levels of gamma-globulin were markedly lower than those of the control group, whereas the levels of alpha-globulin were not affected. The specific activity of alkaline phosphatase of the 6-AN group was significantly lower than that of the control and pair-fed groups and that of aspartate aminotransferase only lower than that of the control group but not the pair-fed group. The specific activities of creatine phosphokinase and lactate dehydrogenase of the 6-AN group were the greatest among the three groups, whereas those of the pair-fed group were greater than those of the control group. The results suggest that 6-AN may interfere with the proper maintenance of energy charges and the immune system function.
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Affiliation(s)
- Y B Lee
- Department of Biology, Dongguk University, 100-715, Seoul, South Korea
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36
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Abstract
We investigated the effects of the coenzyme NAD+ (nicotinamide adenine dinucleotide) and its analogs on the self-splicing of primary transcripts of the phage T4 thymidylate synthase gene (td). Of all the nicotinamide coenzymes and analogs tested, NADP+ was the strongest inhibitor, with a potency approximately threefold that of NAD+. Kinetic analysis demonstrated that NAD+ acts as a mixed type noncompetitive inhibitor for the td intron RNA with a K(i) of 4.1 mM. The splicing specificity inhibition by NAD+ is predominantly due to changes in Km and kcat, and was Mg2+ concentration dependent. The results suggest that both the ADP and nicotinamide moieties are the key structural features in NAD+ responsible for the inhibition of splicing.
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Affiliation(s)
- I K Park
- Department of Biology, Dongguk University, Seoul, 100-715, Korea
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37
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Park IK, Klug CA, Li K, Jerabek L, Li L, Nanamori M, Neubig RR, Hood L, Weissman IL, Clarke MF. Molecular cloning and characterization of a novel regulator of G-protein signaling from mouse hematopoietic stem cells. J Biol Chem 2001; 276:915-23. [PMID: 11042171 DOI: 10.1074/jbc.m005947200] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [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: 11/06/2022] Open
Abstract
A novel regulator of G-protein signaling (RGS) has been isolated from a highly purified population of mouse long-term hematopoietic stem cells, and designated RGS18. It has 234 amino acids consisting of a central RGS box and short divergent NH(2) and COOH termini. The calculated molecular weight of RGS18 is 27,610 and the isoelectric point is 8.63. Mouse RGS18 is expressed from a single gene and shows tissue specific distribution. It is most highly expressed in bone marrow followed by fetal liver, spleen, and then lung. In bone marrow, RGS18 level is highest in long-term and short-term hematopoietic stem cells, and is decreased as they differentiate into more committed multiple progenitors. The human RGS18 ortholog has a tissue-specific expression pattern similar to that of mouse RGS18. Purified RGS18 interacts with the alpha subunit of both G(i) and G(q) subfamilies. The results of in vitro GTPase single-turnover assays using Galpha(i) indicated that RGS18 accelerates the intrinsic GTPase activity of Galpha(i). Transient overexpression of RGS18 attenuated inositol phosphates production via angiotensin receptor and transcriptional activation through cAMP-responsive element via M1 muscarinic receptor. This suggests RGS18 can act on G(q)-mediated signaling pathways in vivo.
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Affiliation(s)
- I K Park
- Department of Internal Medicine, Division of Hematology and Oncology, University of Michigan, Ann Arbor, Michigan 48109, USA
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Park IK, Koh YH. Effects of nicotinamide coenzymes on the stability of enzyme activities and proteins in niacin-deficient quail tissues against trypsin treatment. Comp Biochem Physiol B Biochem Mol Biol 2001; 128:99-107. [PMID: 11163309 DOI: 10.1016/s1096-4959(00)00302-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The stability of liver and muscle enzymes and proteins in niacin-deficient quail towards trypsin treatment in the presence and absence of coenzymes, NAD or NADP, was characterized. The protection of liver dehydrogenases by coenzymes was low when they are subjected to trypsin digestion for 60 min. In contrast, in the muscle there was substantial protection against trypsin inactivation of glyceraldehyde-3-phosphate dehydrogenase by NAD and of 6-phosphogluconate dehydrogenase by NADP. Among all enzymes tested, glyceraldehyde-3-phosphate dehydrogenase showed the greatest protection against trypsin inactivation by NAD. SDS-polyacrylamide gel electrophoresis demonstrated that muscle proteins from the niacin-deficient group were more substantially protected compared to control and pair-fed groups when liver and muscle extracts were spiked with NAD and subjected to trypsin digestion. Overall results suggest that niacin deficiency exerted specific destabilizing effects on the stability of enzymes and proteins in muscle.
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Affiliation(s)
- I K Park
- Department of Biology, Faculty of Science, Dongguk University, 100-715, Seoul, South
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Park IK, Park YH, Shin BA, Choi ES, Kim YR, Akaike T, Cho CS, Park YK, Park YR. Galactosylated chitosan-graft-dextran as hepatocyte-targeting DNA carrier. J Control Release 2000; 69:97-108. [PMID: 11018549 DOI: 10.1016/s0168-3659(00)00298-4] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.6] [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: 11/21/2022]
Abstract
Lactobionic acid bearing galactose group was coupled with chitosan for liver specificity, and dextran was grafted to galactosylated chitosan (GC) for stability in water. Compared to the GC/DNA complex, the stability of the galactosylated chitosan-graft-dextran (GCD)/DNA complex could be enhanced. The particle size of the GCD/DNA complexes decreased as the charge ratio of GCD to DNA increased. Conformational change of DNA did not occur after complex formation with GCD compared with the conformation of DNA itself. The GCD/DNA complexes were only transfected into Chang liver cells and that of Hep G2 having asialoglycoprotein receptors (ASGR), indicative of specific interaction of ASGRs on cells and galactose ligands on chitosan.
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Affiliation(s)
- I K Park
- School of Agricultural Biotechnology, Seoul National University, Suwon 441-744, South Korea
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40
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Abstract
The effects of Mg(2+) and K(+) ions on the self-splicing inhibition of the td (thymidylate synthase gene) intron RNA by spectinomycin were investigated. The maximum splicing activity occurred at 20 mM KCl. The K(m) and V(max) values for GTP in the presence of 5 mM Mg(2+) are 2.25 microM and 0.55 min(-1), whereas those for GTP both in the presence of 5 mM Mg(2+) and 5 mM K(+) are 1.23 microM and 0. 46 min(-1), respectively. Spectinomycin at 10 mM concentration inhibited the splicing by about 10%, but at 20 mM concentration, the splicing rate was inhibited by about 63%. The splicing inhibition by the low concentration of spectinomycin was overcome markedly as the concentration of Mg(2+) ion was raised. At 30 mM spectinomycin, however, the splicing inhibition was not significantly affected by increasing the concentration of Mg(2+). A similar activation of the splicing rate was observed as the concentration of K(+) ion was increased. The concentration of K(+) ion required for the normal recovery of the splicing was much higher than that of Mg(2+) ion. Unlike Mg(2+) ion, 30 mM K(+) ion effectively alleviated the splicing inhibition by spectinomycin at its high concentration. The results indicate that K(+) and Mg(2+) ions may show mechanistically different interactions with spectinomycin in the self-splicing reaction of the td intron RNA.
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Affiliation(s)
- I K Park
- Department of Biology, Dongguk University, Seoul, 100-715, South
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Abstract
Effects of the coenzyme flavin mononucleotide (FMN) and its analogs on the self-splicing of primary transcripts of the phage T4 thymidylate synthase gene (td) have been investigated. Among all flavins and analogs tested, the lumichrome was the most inhibitory. The kinetic analysis demonstrated that FMN acts as a competitive inhibitor for the td intron RNA with a Ki of 1.86 mM although it does not possess a guanidino group in its structure. FMN is able to inhibit the first step of the self-splicing, thus identifying FMN as a novel class of group I intron splicing inhibitors. The specificity of the splicing inhibition by FMN is predominantly due to changes in Km but not k(cat). The splicing inhibition is believed to be due to the interference with the affinity of GTP for the intron RNA. The analysis of the inhibitory concentration and structural examination suggests that the key structural features in FMN responsible for the inhibition of splicing may be an alloxazine group.
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Affiliation(s)
- J Y Kim
- Department of Biology, Dongguk University, 100-715, Seoul, South Korea
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Park IK, Lee HS, Lee SG, Park JD, Ahn YJ. Insecticidal and fumigant activities of Cinnamomum cassia bark-derived materials against Mechoris ursulus (Coleoptera: attelabidae). J Agric Food Chem 2000; 48:2528-31. [PMID: 10888580 DOI: 10.1021/jf9904160] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The insecticidal and fumigant activities of Cinnamomum cassia (Blume) bark-derived materials against the oak nut weevil (Mechoris ursulus Roelofs) were examined using filter paper diffusion and fumigation methods and compared to those of the commercially available Cinnamomum bark-derived compounds (eugenol, salicylaldehyde, trans-cinnamic acid, and cinnamyl alcohol). The biologically active constituent of the Cinnamomum bark was characterized as trans-cinnamaldehyde by spectroscopic analysis. In a test with the filter paper diffusion method, trans-cinnamaldehyde showed 100 and 83.3% mortality at rates of 2.5 and 1.0 mg/filter paper, respectively. At 2.5 mg/paper, strong insecticidal activity was produced from eugenol (90.0% mortality) and salicylaldehyde (88. 9%), whereas trans-cinnamic acid revealed moderate activity (73.3%). At 5 mg/paper, weak insecticidal activity (50.0%) was produced from cinnamyl alcohol. In a fumigation test, the Cinnamomum bark-derived compounds were much more effective against M. ursulus larvae in closed cups than in open ones. These results indicate that the insecticidal activity of test compounds was attributable to fumigant action, although there is also significant contact toxicity. As a naturally occurring insect-control agent, the Cinnamomum bark-derived materials described could be useful as a new preventive agent against damage caused by M. ursulus.
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Affiliation(s)
- I K Park
- School of Agricultural Biotechnology, Seoul National University, Suwon Republic of Korea
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Yang YC, Kim JY, Park IK. Neurotoxin 6-aminonicotinamide affects levels of soluble proteins and enzyme activities in various tissues of golden hamsters. Int J Biochem Cell Biol 2000; 32:549-56. [PMID: 10736570 DOI: 10.1016/s1357-2725(99)00150-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effects of neurotoxin 6-aminonicotinamide (6-AN) on the levels of soluble proteins and enzyme activities in various tissues of golden hamsters were investigated. SDS-polyacrylamide gel electrophoresis showed that a soluble spinal cord protein with molecular mass 75.0 kDa was present at a higher concentration in the treated group compared to that in the control while that of a molecular mass 64.8 kDa appeared to be missing. However, there were no noticeable differences in protein concentrations observed with the cerebrum, brain stem, and cerebellum. Similarly, treatment with 6-AN decreased the concentration of a soluble protein in pectoral muscle having molecular mass 97.2 kDa and increased those having molecular masses 207.4 and 32.1 kDa. In the kidney, soluble proteins with molecular masses 176.6 kDa was missing and those of molecular masses 97.6, 49, 43.3, and 33.8 kDa were decreased whereas those of molecular masses 64.7 and 33.1 kDa were increased. In the testis the soluble proteins with molecular masses 125.4, 88.7, 69.0, 31.2, 19.1, and 17.4 kDa were missing and those of molecular masses 97.0, 51.3, 42.0, 33.0, 27.2, and 22.6 kDa were present in lower amounts whereas those of molecular masses 311.5, 75.0, 64.0, 54.1, and 53.2 kDa were present in higher amounts. The specific activity of 6-phosphogluconate dehydrogenase was markedly increased in the liver but that of other tissues was not affected. Acetylcholinesterase activity was markedly reduced in the spleen but was enhanced in the intestine. Monoamine oxidase activity was markedly reduced in the brain stem, cerebrum, kidney, and liver. The results suggest that the changes in levels of soluble proteins and enzyme activities shown with golden hamster tissues by 6-AN administration were quite different from those shown with quail tissues.
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Affiliation(s)
- Y C Yang
- Department of Anatomy, Wonju College of Medicine, Yonsei University, Wonju, South Korea
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Park IK, Lee HS, Lee SG, Park JD, Ahn YJ. Antifeeding activity of isoquinoline alkaloids identified in Coptis japonica roots against Hyphantria cunea (Lepidoptera: Arctiidae) and Agelastica coerulea (Coleoptera: Galerucinae). J Econ Entomol 2000; 93:331-5. [PMID: 10826181 DOI: 10.1603/0022-0493-93.2.331] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The anti-feeding activity of 3 isoquinoline alkaloids identified from roots of Coptis japonica Makino toward 4th-instar larvae of Hyphantria cunea Drury and adults of Agelastica coerulea Baly was examined using the leaf-dipping bioassay. The biologically active constituents of the Coptis roots were characterized as the isoquinoline alkaloids berberine, palmatine and coptisine by spectroscopic analysis. In a test with H. cunea larvae, the anti-feeding activity was much more pronounced in an application of a mixture of palmatine iodide and berberine chloride (1:1, wt:wt) at 250 ppm (82.3%) and 500 ppm (100%), compared with palmatine iodide (76.0%) and berberine chloride (75.4%) alone at 500 ppm. These results indicate a synergistic effect. With A. courulea adults, berberine chloride showed 57.5 and 91.1% anti-feeding activity at 125 and 250 ppm, respectively; whereas, weak activity was obtained in application of 500 ppm of palmatine iodide (41.4%) and coptisine chloride (52.4%) alone. The Coptis root-derived compounds merit further study as potential insect-control agents.
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Affiliation(s)
- I K Park
- School of Applied Biology & Chemistry and Research Center for New Bio-Materials in Agriculture, College of Agriculture and Life Sciences, Seoul National University, Republic of Korea
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Abstract
Effects of the aminoglycoside spectinomycin on the self-splicing of primary transcripts of the phage T4 thymidylate synthase gene (td) have been investigated. The kinetic analysis demonstrated that spectinomycin acts as a mixed noncompetitive inhibitor for the td intron RNA with a K(i) of 7.2 mM. Increasing the spectinomycin concentration raised the K(m) values with the corresponding decrease of V(max) and k(cat) values. The specificity of the splicing inhibition by spectinomycin is due to changes in both K(m) and k(cat). The splicing inhibition by spectinomycin is dependent on pH changes and Mg(2+) concentration, indicating electrostatic interactions with the intron RNA. It has been proposed that the key structural features in spectinomycin responsible for the inhibition of splicing may be the hydroxyl groups on the antibiotic.
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Affiliation(s)
- I K Park
- Department of Biology, Dongguk University, Seoul, 100-715, Korea.
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Oh JW, Lee HB, Yum MK, Kim CR, Kang JO, Park IK. ECP level in nasopharyngeal secretions and serum from children with respiratory virus infections and asthmatic children. Allergy Asthma Proc 2000; 21:97-100. [PMID: 10791110 DOI: 10.2500/108854100778250888] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Infection with respiratory virus has been shown to exacerbate asthma in humans. However, the role of a respiratory virus in the pathogenesis of chronic asthma and/or wheezing in young children has not been clearly defined. It has also been debated whether virus-induced wheezing in young children is one entity and allergic asthma another, or whether they are different expressions of the same disease. The present study was done to compare ECP concentrations in nasopharyngeal secretions and serum from 32 nonasthmatic wheezing children with viral infections (RSV in 15 children; influenza B virus in 17 children detected by immunofluorescence antibody technique), 8 asthmatic children without viral infections, and 13 normal children as the controls to understand the role of eosinophil inflammation. The geometric mean of ECP in nasopharyngeal secretions was significantly higher in asthmatic children than in children with virus-induced wheezing (p < 0.05). ECP levels of nasopharyngeal secretions from children with the virus-induced wheezing were significantly greater than those of the controls. However, there were no significant differences in ECP levels in serum among subjects.
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Affiliation(s)
- J W Oh
- Department of Pediatrics, Hanyang University, College of Medicine, Seoul, Korea
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Park IK, Lyu MA, Yeo SJ, Han TH, Kook YH. Sp1 mediates constitutive and transforming growth factor beta-inducible expression of urokinase type plasminogen activator receptor gene in human monocyte-like U937 cells. Biochim Biophys Acta 2000; 1490:302-10. [PMID: 10684975 DOI: 10.1016/s0167-4781(99)00246-8] [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] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Urokinase type plasminogen activator receptor (uPAR) is known to be involved in conversion of plasminogen into plasmin and its expression can be regulated by a variety of biological agents including transforming growth factor beta (TGF-beta). In the present study, we cloned the promoter region of the human uPAR (huPAR) gene (-653 to +61) and investigated the transcription regulatory mechanism of the expression of the huPAR gene upon treatment with TGF-beta in human monocyte-like U937 cells. By deletion and point mutational analysis of the huPAR gene promoter, it was found that the sequence positioned at -70 is required for both constitutive and TGF-beta-inducible expression of the huPAR gene in U937 cells. Using electrophoretic mobility shift assay, we could observe that Sp1 formed a DNA-protein complex at the -70 sequence. In addition, antisense oligonucleotide against human Sp1 blocked both constitutive and TGF-beta-inducible expression of the luciferase reporter gene driven by the huPAR gene promoter in U937 cells. These results led us to conclude that Sp1 transcription factor mediates constitutive and TGF-beta-inducible expression of the huPAR gene in U937 cells through binding to the sequence located at -70.
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Affiliation(s)
- I K Park
- Department of Microbiology and Cancer Research Center, Seoul National University College of Medicine, and Clinical Research Institute, Seoul National University Hospital, 28 Yongon-Dong, Chongno-Gu, Seoul, Korea
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Choi MY, Park IK, Yu YS. Long term refractive outcome in eyes of preterm infants with and without retinopathy of prematurity: comparison of keratometric value, axial length, anterior chamber depth, and lens thickness. Br J Ophthalmol 2000; 84:138-43. [PMID: 10655187 PMCID: PMC1723385 DOI: 10.1136/bjo.84.2.138] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.4] [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: 01/07/2023]
Abstract
BACKGROUND/AIMS A longitudinal study of premature infants was conducted to examine changes in refractive status and their relation with age and factors influencing the occurrence and degree of myopia. Identification of which of the various refractive factors play important parts in relation to myopia in premature infants was attempted. METHODS Under observation were 125 eyes in 65 patients who were found to demonstrate no signs of retinopathy of prematurity (ROP) or who had grade I or II ROP without or after cryotherapy. Cycloplegic refractions were conducted at 6 months, 3 years, and 6 years of age; at 6 years of age keratometric values, lens thicknesses, and axial lengths were recorded, and anterior chamber depths also were measured. RESULTS Myopia begins to appear at 6 months of age and its severity increases between the ages of 6 months and 3 years. The condition showed no further progress in subjects older than 3 years. Of the 104 eyes with ROP, those eyes with cicatricial retinopathy tended towards myopia and high myopia while there was no difference in the degree of myopia related to whether or not cryotherapy was conducted. At 6 years of age, the premature infants exhibited shallower anterior chambers, thicker lenses, and higher axial lengths when the degree of the myopia was higher. The keratometric values, however, appeared to bear no relation to the degree of the myopia. CONCLUSION These results suggest that the occurrence of myopia is related more strongly to whether or not there is cicatricial retinopathy than whether or not there is cryotherapy. Also, the degree of the myopia was found to be related to the depth of the anterior chamber, the thickness of the lens, and the change in axial length but not to keratometric value.
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Affiliation(s)
- M Y Choi
- Department of Ophthalmology, College of Medicine, Chungbuk National University, Cheongju, Korea
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Abstract
OBJECTIVES This study examined the effect of cilostazol, a potent phosphodiesterase inhibitor, on the progression of neuropathies associated with streptozotocin-induced diabetes mellitus in Sprague-Dawley rats. METHODS Eight weeks after streptozotocin treatment, a pelleted diet containing 0.03% cilostazol (15 mg/kg body weight) was given for four weeks. Body weight, blood glucose level, motor nerve conduction velocity (MNCV), myelinated fiber density and size distribution of sciatic nerves were compared between age-matched normal rats (Group 1), control diabetic rats (Group 2) and cilostazol-treated diabetic rats (Group 3). RESULTS Body weight was significantly reduced and blood glucose level was significantly increased in diabetic rats (Group 2 and 3) compared to normal rats. MNCV and cAMP content of sciatic nerves were significantly reduced in diabetic rats 12 weeks after streptozotocin treatment. Myelinated fiber size and density were also significantly reduced, and thickening of the capillary walls and duplication of the basement membranes of the endoneural vessels were observed in the diabetic rats. Whereas both body weight and blood glucose level of Group 3 did not differ significantly from those of Group 2, cilostazol treatment significantly increased MNCV and cAMP content of sciatic nerves in Group 3 but not to the levels observed in Group 1. MNCV positively correlated with cAMP content of sciatic nerves (r = 0.86; p < 0.001). Cilostazol treatment not only restored myelinated fiber density and size distribution but reversed some of the vascular abnormalities. CONCLUSION These findings suggest that a reduced cAMP content in motor nerves may be involved in the development of diabetic neuropathy, and that cilostazol may prevent the progression of diabetic neuropathy by restoring functional impairment and morphological changes of peripheral nerves.
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Affiliation(s)
- K S Suh
- Department of Internal Medicine, Kyung Hee University School of Medicine, Seoul, Korea
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Oh JW, Lee HB, Kim CR, Yum MK, Koh YJ, Moon SJ, Kang JO, Park IK. Analysis of induced sputum to examine the effects of inhaled corticosteroid on airway inflammation in children with asthma. Ann Allergy Asthma Immunol 1999; 82:491-6. [PMID: 10353582 DOI: 10.1016/s1081-1206(10)62727-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [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: 11/25/2022]
Abstract
BACKGROUND Analysis of induced sputum can be performed safely in children with asthma and is useful for both cellular and biochemical markers of inflammation. Glucocorticosteroid inhalation has become the first line therapy for chronic asthma by suppressing airway inflammation, which produces the decrease of bronchial hyperreactivity and reduces the number of eosinophil in bronchial submucosa. OBJECTIVE To determine the characteristics of the inflammatory cells and their markers in sputum and to examine the pharmacokinetic effects of glucocorticoid within 3 hours after inhalation therapy on FEV1 and sputum inflammatory indices in children with clinically defined chronic asthma. METHODS Thirty subjects with asthma included 14 current symptomatic asthmatics and 14 normal controls inhaled 4.5% hypertonic saline for 10 minutes by nebulizer. The expectorated sputum were collected from all asthmatics before and 3 hours after corticosteroid inhalation for children with asthma and were reduced by dithiotreitol. Total cell counts and differentials were determined. ECP was measured by CAP system. Interleukin-5, GM-CSF and albumin were measured by double sandwich ELISA. RESULTS The mean eosinophil percentage and ECP in induced sputum of asthmatics were significantly higher than that of controls. The induced sputum samples obtained after glucocorticoid inhalation showed a significant reduction in mean eosinophil percentage, but FEV1, IL-5, GM-CSF, albumin, and ECP values were not significantly decreased. CONCLUSION The present results in induced sputum may be interpreted to reflect direct steroid action on airways and lack of effect on bone marrow effectors at 3 hours after glucocorticoid inhalation.
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Affiliation(s)
- J W Oh
- Department of Pediatrics, Hanyang University, College of Medicine, Seoul, Korea
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