1
|
Youn D, Kim NG, Jeong WJ, Chung DJ, Kim JY, Kim H. Endothermic Dehydrogenation-Driven Preventive Magnesiation of SiO for High-Performance Lithium Storage Materials. ACS Appl Mater Interfaces 2022; 14:45333-45341. [PMID: 36173933 DOI: 10.1021/acsami.2c11902] [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] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Silicon monoxide (SiO)-based materials have gained much attention as high-capacity lithium storage materials based on their high capacity and stable capacity retention. However, low initial Coulombic efficiency associated with the irreversible electrochemical reaction of the amorphous SiO2 phase in SiO inhibits the wide usage of SiO-based anode materials for lithium-ion batteries. Magnesiation of SiO is one of the most promising solutions to improve the initial efficiency of SiO-based anode materials. Herein, we demonstrate that endothermic dehydrogenation-driven magnesiation of SiO employing MgH2 enhanced the initial Coulombic efficiency of 89.5% with much improved long-term cycle performance over 300 cycles compared to the homologue prepared by magnesiation of SiO with Mg and pristine SiO. High-resolution transmission electron microscopy with thermogravimetry-differential scanning calorimetry revealed that the endothermic dehydrogenation of MgH2 suppressed the sudden temperature rise during magnesiation of SiO, thereby inhibiting the coarsening of the active Si phase in the resulting Si/Mg2SiO4 nanocomposite.
Collapse
Affiliation(s)
- Donghan Youn
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul04763, Republic of Korea
| | - Nam Gyu Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul04763, Republic of Korea
| | - Won Joon Jeong
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul04763, Republic of Korea
| | - Dong Jae Chung
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul04763, Republic of Korea
| | - Ji Young Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul04763, Republic of Korea
| | - Hansu Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul04763, Republic of Korea
| |
Collapse
|
2
|
Chung DJ, Youn D, Kim JY, Jeong WJ, Kim S, Ma D, Lee TR, Kim ST, Kim H. Topology Optimized Prelithiated SiO Anode Materials for Lithium-Ion Batteries. Small 2022; 18:e2202209. [PMID: 35686333 DOI: 10.1002/smll.202202209] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 06/01/2022] [Indexed: 06/15/2023]
Abstract
Silicon monoxide (SiO)-based materials have great potential as high-capacity anode materials for lithium-ion batteries. However, they suffer from a low initial coulombic efficiency (ICE) and poor cycle stability, which prevent their successful implementation into commercial lithium-ion batteries. Despite considerable efforts in recent decades, their low ICE and poor cycle stability cannot be resolved at the same time. Here, it is demonstrated that the topological optimization of the prelithiated SiO materials is highly effective in improving both ICE and capacity retention. Laser-assisted atom probe tomography combined with thermogravimetry and differential scanning calorimetry reveals that two exothermic reactions related to microstructural evolution are key in optimizing the domain size of the Si active phase and Li2 SiO3 buffer phase, and their topological arrangements in prelithiated SiO materials. The optimized prelithiated SiO, heat-treated at 650 °C, shows higher capacity retention of 73.4% and lower thickness changes of 68% after 300 cycles than those treated at other temperatures, with high ICE of ≈90% and reversible capacity of 1164 mAh g-1 . Such excellent electrochemical properties of the prelithiated SiO electrode originate from its optimized topological arrangement of active Si phase and Li2 SiO3 inactive buffer phase.
Collapse
Affiliation(s)
- Dong Jae Chung
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Donghan Youn
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Ji Young Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Won Joon Jeong
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Soohwan Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Donghyeok Ma
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Tae Rim Lee
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Seung Tae Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| | - Hansu Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, Republic of Korea
| |
Collapse
|
3
|
Park H, Lee DG, Chung DJ, Sohn M, Park C, Kim H. Real‐Time Dilation Observation of Si‐Alloy Electrode Using Thermally Treated Poly (Amide‐Imide) as a Binder for Lithium Ion Battery. B KOREAN CHEM SOC 2019. [DOI: 10.1002/bkcs.11674] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Hyeong‐Il Park
- Department of Energy EngineeringHanyang University Seoul, 04763 Republic of Korea
| | - Dong Geun Lee
- Department of Energy EngineeringHanyang University Seoul, 04763 Republic of Korea
| | - Dong Jae Chung
- Department of Energy EngineeringHanyang University Seoul, 04763 Republic of Korea
| | - Myungbeom Sohn
- Department of Energy EngineeringHanyang University Seoul, 04763 Republic of Korea
| | - Cheolho Park
- Next‐G Institute of Technology, Iljin Electric Co., Ltd. Ansan, 15427 Republic of Korea
| | - Hansu Kim
- Department of Energy EngineeringHanyang University Seoul, 04763 Republic of Korea
| |
Collapse
|
4
|
Sohn M, Lee DG, Chung DJ, Kim A, Kim H. Cycle‐dependent Microstructural Changes of Silicon‐Carbon Composite Anodes for Lithium‐Ion Batteries. B KOREAN CHEM SOC 2019. [DOI: 10.1002/bkcs.11660] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Myungbeom Sohn
- Department of Energy EngineeringHanyang University Seoul 04763 Republic of Korea
| | - Dong Geun Lee
- Department of Energy EngineeringHanyang University Seoul 04763 Republic of Korea
| | - Dong Jae Chung
- Department of Energy EngineeringHanyang University Seoul 04763 Republic of Korea
| | - Ayoung Kim
- Department of Energy EngineeringHanyang University Seoul 04763 Republic of Korea
| | - Hansu Kim
- Department of Energy EngineeringHanyang University Seoul 04763 Republic of Korea
| |
Collapse
|
5
|
Huang C, Kim A, Chung DJ, Park E, Young NP, Jurkschat K, Kim H, Grant PS. Multiscale Engineered Si/SiO x Nanocomposite Electrodes for Lithium-Ion Batteries Using Layer-by-Layer Spray Deposition. ACS Appl Mater Interfaces 2018; 10:15624-15633. [PMID: 29676903 DOI: 10.1021/acsami.8b00370] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Si-based high-capacity materials have gained much attention as an alternative to graphite in Li-ion battery anodes. Although Si additions to graphite anodes are now commercialized, the fraction of Si that can be usefully exploited is restricted due to its poor cyclability arising from the large volume changes during charge/discharge. Si/SiO x nanocomposites have also shown promising behavior, such as better capacity retention than Si alone because the amorphous SiO x helps to accommodate the volume changes of the Si. Here, we demonstrate a new electrode architecture for further advancing the performance of Si/SiO x nanocomposite anodes using a scalable layer-by-layer atomization spray deposition technique. We show that particulate C interlayers between the current collector and the Si/SiO x layer and between the separator and the Si/SiO x layer improved electrical contact and reduced irreversible pulverization of the Si/SiO x significantly. Overall, the multiscale approach based on microstructuring at the electrode level combined with nanoengineering at the material level improved the capacity, rate capability, and cycling stability compared to that of an anode comprising a random mixture of the same materials.
Collapse
Affiliation(s)
- Chun Huang
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , United Kingdom
| | - Ayoung Kim
- Department of Energy Engineering , Hanyang University , 222 Wangsimni-ro , Seongdong-gu, Seoul 04763 , South Korea
| | - Dong Jae Chung
- Department of Energy Engineering , Hanyang University , 222 Wangsimni-ro , Seongdong-gu, Seoul 04763 , South Korea
| | - Eunjun Park
- Department of Energy Engineering , Hanyang University , 222 Wangsimni-ro , Seongdong-gu, Seoul 04763 , South Korea
| | - Neil P Young
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , United Kingdom
| | - Kerstin Jurkschat
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , United Kingdom
| | - Hansu Kim
- Department of Energy Engineering , Hanyang University , 222 Wangsimni-ro , Seongdong-gu, Seoul 04763 , South Korea
| | - Patrick S Grant
- Department of Materials , University of Oxford , Parks Road , Oxford OX1 3PH , United Kingdom
| |
Collapse
|
6
|
Kim DS, Chung DJ, Park HI, Ansari MZ, Song T, Kim H. Direct Nitradated Graphite Felt as an Electrode Material for the Vanadium Redox Flow Battery. B KOREAN CHEM SOC 2018. [DOI: 10.1002/bkcs.11380] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Dae Sik Kim
- Department of Energy Engineering; Hanyang University Haengdang-Dong; Seoul 04763 Korea
| | - Dong Jae Chung
- Department of Energy Engineering; Hanyang University Haengdang-Dong; Seoul 04763 Korea
| | - Hyeong-Il Park
- Department of Energy Engineering; Hanyang University Haengdang-Dong; Seoul 04763 Korea
| | - Mohammad Zahid Ansari
- School of Materials Science and Engineering; Yeungnam University; Gyeongsan 712-749 Korea
| | - Taeseup Song
- Department of Energy Engineering; Hanyang University Haengdang-Dong; Seoul 04763 Korea
| | - Hansu Kim
- Department of Energy Engineering; Hanyang University Haengdang-Dong; Seoul 04763 Korea
| |
Collapse
|
7
|
Chung JO, Park SY, Cho DH, Chung DJ, Chung MY. Plasma neutrophil gelatinase-associated lipocalin levels are positively associated with diabetic retinopathy in patients with Type 2 diabetes. Diabet Med 2016; 33:1649-1654. [PMID: 27100138 DOI: 10.1111/dme.13141] [Citation(s) in RCA: 16] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/19/2016] [Indexed: 11/30/2022]
Abstract
AIM To assess the relationship between plasma neutrophil gelatinase-associated lipocalin (NGAL) levels and diabetic retinopathy in patients with Type 2 diabetes. METHODS In total, 204 patients with Type 2 diabetes were investigated in this cross-sectional study. They were classified as having no diabetic retinopathy, non-proliferative diabetic retinopathy (NPDR) or proliferative retinopathy (PDR), according to the degree of diabetic retinopathy. Thus, diabetic retinopathy in the patients in this study was either NPDR or PDR. RESULTS Plasma NGAL concentrations were significantly higher in patients with diabetic retinopathy than in those without. The mean plasma NGAL levels differed significantly according to the severity of diabetic retinopathy (no diabetic retinopathy, 120.8 ng/ml; NPDR, 217.8 ng/ml; PDR, 372.4 ng/ml; P for trend = 0.002) after adjustment for other covariates. In multivariable analysis, plasma NGAL levels were significantly associated with diabetic retinopathy (odds ratio for each standard deviation increase in the logarithmic value, 7.75; 95% confidence interval, 2.04-29.41, P = 0.003). CONCLUSION Plasma NGAL levels were positively associated with diabetic retinopathy in patients with Type 2 diabetes.
Collapse
Affiliation(s)
- J O Chung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - S Y Park
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - D H Cho
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - D J Chung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | - M Y Chung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| |
Collapse
|
8
|
Park E, Kim J, Chung DJ, Park MS, Kim H, Kim JH. Si/SiO x -Conductive Polymer Core-Shell Nanospheres with an Improved Conducting Path Preservation for Lithium-Ion Battery. ChemSusChem 2016; 9:2754-2758. [PMID: 27572935 DOI: 10.1002/cssc.201600798] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 07/20/2016] [Indexed: 06/06/2023]
Abstract
Non-stoichiometric SiOx based materials have gained much attention as high capacity lithium storage materials. However, their anode performance of these materials should be further improved for their commercial success. A conductive polymer, poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS), is employed as a flexible electrical interconnector to improve the electrochemical performance of Si/SiOx nanosphere anode materials for lithium ion batteries (LIBs). The resulting Si/SiOx -PEDOT:PSS core-shell structured material with the small amount (1 wt %) of PEDOT:PSS shows the improved initial reversible capacity of 968.2 mA h g-1 with excellent long-term cycle performance over 200 cycles. These promising properties can be attributed to the use of the electroconductive and flexible PEDOT:PSS shell layer, which protects the electrical conduction pathways in the electrode from the large volume changes of silicon during cycling.
Collapse
Affiliation(s)
- Eunjun Park
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, South Korea
| | - Jeonghun Kim
- Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, North Wollongong, New South Wales, 2500, Australia
| | - Dong Jae Chung
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, South Korea
| | - Min-Sik Park
- Department of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin-si, Gyeonggi-do, 17104, South Korea
| | - Hansu Kim
- Department of Energy Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul, 04763, South Korea.
| | - Jung Ho Kim
- Institute for Superconducting and Electronic Materials (ISEM), Australian Institute for Innovative Materials (AIIM), University of Wollongong, North Wollongong, New South Wales, 2500, Australia.
| |
Collapse
|
9
|
Afifi S, Adel NG, Devlin S, Duck E, Vanak J, Landau H, Chung DJ, Lendvai N, Lesokhin A, Korde N, Reich L, Landgren O, Giralt S, Hassoun H. Upfront plerixafor plus G-CSF versus cyclophosphamide plus G-CSF for stem cell mobilization in multiple myeloma: efficacy and cost analysis study. Bone Marrow Transplant 2016; 51:546-52. [PMID: 26726942 DOI: 10.1038/bmt.2015.322] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 10/15/2015] [Accepted: 11/08/2015] [Indexed: 12/22/2022]
Abstract
Cyclophosphamide plus G-CSF (C+G-CSF) is one of the most widely used stem cell (SC) mobilization regimens for patients with multiple myeloma (MM). Plerixafor plus G-CSF (P+G-CSF) has demonstrated superior SC mobilization efficacy when compared with G-CSF alone and has been shown to rescue patients who fail mobilization with G-CSF or C+G-CSF. Despite the proven efficacy of P+G-CSF in upfront SC mobilization, its use has been limited, mostly due to concerns of high price of the drug. However, a comprehensive comparison of the efficacy and cost effectiveness of SC mobilization using C+G-CSF versus P+G-CSF is not available. In this study, we compared 111 patients receiving C+G-CSF to 112 patients receiving P+G-CSF. The use of P+G-CSF was associated with a higher success rate of SC collection defined as ⩾5 × 10(6) CD34+ cells/kg (94 versus 83%, P=0.013) and less toxicities. Thirteen patients in the C+G-CSF arm were hospitalized owing to complications while none in the P+G-CSF group. C+G-CSF was associated with higher financial burden as assessed using institutional-specific costs and charges (P<0.001) as well as using Medicare reimbursement rates (P=0.27). Higher rate of hospitalization, increased need for salvage mobilization, and increased G-CSF use account for these differences.
Collapse
Affiliation(s)
- S Afifi
- Pharmacy Department, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - N G Adel
- Pharmacy Department, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - S Devlin
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Epidemiology-Biostatistics, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - E Duck
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Finance, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - J Vanak
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Finance, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - H Landau
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - D J Chung
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - N Lendvai
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - A Lesokhin
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - N Korde
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - L Reich
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - O Landgren
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - S Giralt
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| | - H Hassoun
- Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Department of Medicine, Division of Hematologic Malignancies, Memorial Sloan Kettering Cancer Center, New York, NY, USA.,Weill Cornell Medical College, New York, NY, USA
| |
Collapse
|
10
|
Chung JO, Cho DH, Chung DJ, Chung MY. Serum bilirubin concentrations are positively associated with serum C-peptide levels in patients with Type 2 diabetes. Diabet Med 2014; 31:1316-22. [PMID: 24910105 DOI: 10.1111/dme.12516] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/03/2014] [Indexed: 01/02/2023]
Abstract
AIMS To investigate the relationship between physiological serum total bilirubin concentrations and serum C-peptide levels in Korean patients with Type 2 diabetes. METHODS A total of 588 patients with Type 2 diabetes were investigated in this cross-sectional study. Fasting C-peptide level, 2-h postprandial C-peptide level and ΔC-peptide (postprandial C-peptide minus fasting C-peptide) level were measured in all patients. RESULTS Fasting C-peptide level, postprandial C-peptide level and ΔC-peptide level tended to be higher in patients with higher bilirubin concentrations. Partial correlation analysis showed that serum bilirubin levels were significantly correlated with fasting C-peptide level (r = 0.159, P < 0.001), postprandial C-peptide level (r = 0.209, P < 0.001) and ΔC-peptide level (r = 0.186, P < 0.001) after adjustment for other covariates. In the multivariate model, the association between serum bilirubin concentrations and serum C-peptide levels remained significant after adjustment for confounding factors including age, gender, familial diabetes, hypertension, hyperlipidaemia, BMI, HbA1c , duration of diabetes and associated liver function tests (fasting C-peptide level: β = 0.083, P = 0.041; postprandial C-peptide level: β = 0.106, P = 0.005; ΔC-peptide level: β = 0.096, P = 0.015, respectively). CONCLUSIONS Serum bilirubin concentrations within the physiological range were positively associated with serum C-peptide levels in patients with Type 2 diabetes.
Collapse
Affiliation(s)
- J O Chung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Republic of Korea
| | | | | | | |
Collapse
|
11
|
Chung JO, Cho DH, Chung DJ, Chung MY. Physiological serum bilirubin concentrations are inversely associated with the prevalence of cardiovascular autonomic neuropathy in patients with Type 2 diabetes. Diabet Med 2014; 31:185-91. [PMID: 24147832 DOI: 10.1111/dme.12338] [Citation(s) in RCA: 19] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Revised: 09/12/2013] [Accepted: 10/17/2013] [Indexed: 01/18/2023]
Abstract
AIMS Although severe hyperbilirubinaemia causes kernicterus in neonates, normal to modestly elevated bilirubin concentrations have been reported to be neuroprotective. However, the relationship between serum bilirubin concentrations and cardiovascular autonomic neuropathy in patients with Type 2 diabetes is currently unknown. This study assessed the relationships between physiological serum total bilirubin concentrations and cardiovascular autonomic neuropathy in patients with Type 2 diabetes. METHODS A total of 2991 patients with Type 2 diabetes were investigated in this cross-sectional study. Cardiovascular autonomic neuropathy was diagnosed by a cardiovascular reflex test. According to the American Diabetes Association criteria, the degree of cardiovascular autonomic dysfunction was graded into normal, early, definite and severe. Cardiovascular autonomic neuropathy was either definite or severe in the present study. An analysis of covariance after adjustment for other covariates was performed. A logistic regression model was used to assess an association of cardiovascular autonomic neuropathy with serum total bilirubin tertiles. RESULTS Serum total bilirubin concentrations were significantly lower in subjects with cardiovascular autonomic neuropathy. The mean total bilirubin values differed significantly according to the severity of cardiovascular autonomic dysfunction (normal 13.0 μmol/l; early 12.3 μmol/l; definite 11.8 μmol/l; severe 10.1 μmol/l; P for trend < 0.001) after adjustment for other covariates. In multivariate analysis, serum total bilirubin levels were significantly associated with cardiovascular autonomic neuropathy (odds ratio 0.36; 95% CI 0.21-0.63 for the highest vs. the lowest bilirubin tertile, P < 0.001). CONCLUSIONS Serum total bilirubin concentrations within the physiologic range are inversely associated with the prevalence of cardiovascular autonomic neuropathy in patients with Type 2 diabetes.
Collapse
Affiliation(s)
- J O Chung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, Chonnam National University Medical School, Gwangju, Korea
| | | | | | | |
Collapse
|
12
|
Cho JH, Park CW, Lee HY, Won MH, Lee JY, Chung DJ. Effect of transient cerebral ischemia on the expression of receptor for advanced glycation end products in the gerbil hippocampus proper. Crit Care 2014. [PMCID: PMC4069828 DOI: 10.1186/cc13646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
13
|
Chung DJ, Wong A, Hayashi K, Yellowley CE. Effect of hypoxia on generation of neurospheres from adipose tissue-derived canine mesenchymal stromal cells. Vet J 2013; 199:123-30. [PMID: 24252224 DOI: 10.1016/j.tvjl.2013.10.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [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: 08/03/2013] [Revised: 10/16/2013] [Accepted: 10/18/2013] [Indexed: 12/29/2022]
Abstract
Adipose tissue-derived mesenchymal stromal cells (AT-MSCs) are good candidates for cell therapy due to the accessibility of fat tissue and the abundance of AT-MSCs therein. Neurospheres are free-floating spherical condensations of cells with neural stem/progenitor cell (NSPC) characteristics that can be derived from AT-MSCs. The aims of this study were to examine the influence of oxygen (O2) tension on generation of neurospheres from canine AT-MSCs (AT-cMSCs) and to develop a hypoxic cell culture system to enhance the survival and therapeutic benefit of generated neurospheres. AT-cMSCs were cultured under varying oxygen tensions (1%, 5% and 21%) in a neurosphere culture system. Neurosphere number and area were evaluated and NSPC markers were quantified using real-time quantitative PCR (qPCR). Effects of oxygen on neurosphere expression of hypoxia inducible factor 1, α subunit (HIF1A) and its target genes, erythropoietin receptor (EPOR), chemokine (C-X-C motif) receptor 4 (CXCR4) and vascular endothelial growth factor (VEGF), were quantified by qPCR. Neural differentiation potential was evaluated in 21% O2 by cell morphology and qPCR. Neurospheres were successfully generated from AT-cMSCs at all O2 tensions. Expression of nestin mRNA (NES) was significantly increased after neurosphere culture and was significantly higher in 1% O2 compared to 5% and 21% O2. Neurospheres cultured in 1% O2 had significantly increased levels of VEGF and EPOR. There was a significant increase in CXCR4 expression in neurospheres generated at all O2 tensions. Neurosphere culture under hypoxia had no negative effect on subsequent neural differentiation. This study suggests that generation of neurospheres under hypoxia could be beneficial when considering these cells for neurological cell therapies.
Collapse
Affiliation(s)
- D J Chung
- Department of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California, Davis, CA 95616, USA
| | - A Wong
- Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA
| | - K Hayashi
- Department of Clinical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA
| | - C E Yellowley
- Department of Anatomy, Physiology, and Cell Biology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.
| |
Collapse
|
14
|
Hwang YC, Kang M, Ahn CW, Park JS, Baik SH, Chung DJ, Jang HC, Kim KA, Lee IK, Min KW, Nam M, Park TS, Son SM, Sung YA, Woo JT, Park KS, Lee MK. Efficacy and safety of glimepiride/metformin sustained release once daily vs. glimepiride/metformin twice daily in patients with type 2 diabetes. Int J Clin Pract 2013; 67:236-43. [PMID: 23336668 DOI: 10.1111/ijcp.12071] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
AIMS The study investigated the clinical equivalence in reducing haemoglobin A1c (A1C) between glimepiride/metformin sustained release (GM-SR) 2/500 mg, a fixed-dose combination, once daily and glimepiride/metformin (GM) 1/250 mg, a fixed-dose combination, twice daily in patients with type 2 diabetes (T2D). METHODS A multicentre, randomised, double-blind, double-dummy study was conducted in 14 hospitals in Korea. Inclusion criteria were age 30-75 years, T2D diagnosis no longer than 10 years previously, A1C between 7% and 10%, and body mass index <40 kg/m(2) . A total of 207 subjects were randomised into the GM-SR group (n=101) or the GM group (n=106). Participants were assessed at baseline, 8 weeks and 16 weeks after treatment. RESULTS After 16 weeks treatment, no difference in baseline-adjusted changes of A1C (primary efficacy variable) was observed between the two groups (-0.59% for GM-SR group vs. -0.61% for GM group, 95% CI: -0.17 to 0.21; p=0.84). In addition, there were no significant differences in secondary efficacy parameters between the two groups, including changes in A1C up to week 8, changes in fasting plasma glucose (FPG) and 2-h-postprandial plasma glucose up to week 8 and week 16, response rate, drug compliance and hypoglycaemic events. However, there was a difference in baseline-adjusted changes of FPG between the two groups (-1.01 mmol/l for GM-SR group vs. -1.52 mmol/l for GM group, p=0.01 in the intention to treat set). CONCLUSIONS GM-SR 2/500 mg once daily was as effective as GM 1/250 mg twice daily in lowering A1C. In addition, no difference was noted in hypoglycaemic events between the two groups.
Collapse
Affiliation(s)
- Y-C Hwang
- Division of Endocrinology and Metabolism, Department Internal Medicine, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
15
|
Pozotrigo M, Adel N, Landau H, Lesokhin A, Lendvai N, Chung DJ, Chimento D, Riedel E, Chen X, Reich L, Comenzo R, Giralt S, Hassoun H. Factors impacting stem cell mobilization failure rate and efficiency in multiple myeloma in the era of novel therapies: experience at Memorial Sloan Kettering Cancer Center. Bone Marrow Transplant 2013; 48:1033-9. [PMID: 23334269 DOI: 10.1038/bmt.2012.281] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 11/10/2012] [Accepted: 12/18/2012] [Indexed: 12/22/2022]
Abstract
Thalidomide, lenalidomide and bortezomib have increasingly been incorporated in first-line induction therapies for multiple myeloma. Concerns regarding the impact of these agents, especially lenalidomide, on stem cell mobilization prompted us to re-evaluate the risk factors that impact mobilization, including exposure to novel induction regimens. Among 317 patients who proceeded to stem cell collection after induction therapy between 2000 and 2009, the rate of mobilization failure, defined as the inability to collect 5 × 10(6) CD34+ cells/kg following the first collection attempt, was 13%. By multivariate analysis, independent risk factors associated with mobilization failure included older age (P=0.04), lower platelet count (P=0.002) and use of single-agent G-CSF for mobilization (P<0.0001). When considering for outcome measurement stem cell collection efficiency measured by the number of CD34+ cells yielded per pheresis performed during first collection attempt, lower platelet count, use of single-agent G-CSF and older age were also associated with lower efficiency. In this population mobilized mostly with cyclophosphamide and G-CSF, the use of lenalidomide during induction was not associated with a lower stem cell collection efficiency by multivariate analysis. The data support the current International Multiple Myeloma Working Group guidelines recommending the use of cyclophosphamide and G-CSF based mobilization for patients previously exposed to lenalidomide.
Collapse
Affiliation(s)
- M Pozotrigo
- Department of Pharmacy, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Kim J, Chung DJ, Jung SE, Cho SH, Hahn ST, Lee JM. Therapeutic effect of high-intensity focused ultrasound combined with transarterial chemoembolisation for hepatocellular carcinoma <5 cm: comparison with transarterial chemoembolisation monotherapy--preliminary observations. Br J Radiol 2012; 85:e940-6. [PMID: 22553305 DOI: 10.1259/bjr/32750755] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
OBJECTIVE To retrospectively compare the therapeutic effects of combined high-intensity focused ultrasound (HIFU) and transarterial chemoembolisation (TACE) with TACE alone for the treatment of non-advanced hepatocellular carcinomas (HCCs) <5 cm. METHODS We retrospectively reviewed the tumour responses of 32 HCCs of 25 patients who underwent combined HIFU and TACE, and 46 HCCs of 32 patients who underwent TACE only. The mean follow-up observation of the TACE+HIFU group was on average 31 months and that of the TACE group was 33 months. Those patients who had undergone any other treatment modality (including systemic chemotherapy) during the follow-up observation period were excluded. The therapeutic effects were classified according to the modified Response Evaluation Criteria In Solid Tumors (mRECIST): complete response (CR), partial response (PR), stable disease (SD) and progressive disease (PD). Additionally, we defined CR', PR', SD' and PD' as the therapeutic effects "per tumour". RESULTS The disease control rate calculated using the RECIST criteria (CR+PR+SD/All) was 48% in the HIFU+TACE group and 47% in the TACE group (p=0.78, Fisher's exact test). The disease control rate "per tumour" (CR'+PR'+SD'/All) was 78% in the HIFU+TACE group and 54% in the TACE group (p=0.035, Fisher's exact test). In the HIFU+TACE group, no HIFU-related complications requiring treatment were observed. The median survival time was 57 months in TACE+HIFU group and 36 months in the TACE group (p=0.048). CONCLUSION This preliminary study shows that the combination therapy of HIFU and TACE is more effective than TACE monotherapy for treating HCCs <5 cm.
Collapse
Affiliation(s)
- J Kim
- Department of Radiology, Yeouido St. Mary's Hospital, The Catholic University of Korea, Seoul, Republic of Korea
| | | | | | | | | | | |
Collapse
|
17
|
Kim YJ, Chung DJ, Byun JH, Kim YS. Metastatic acinar cell carcinoma of the liver from a benign-appearing pancreatic lesion: a mimic of hepatocellular carcinoma. Br J Radiol 2011; 84:e151-3. [PMID: 21750130 DOI: 10.1259/bjr/26942051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Acinar cell carcinoma (ACC) is a rare pancreatic tumour with a favourable prognosis compared with the more common ductal adenocarcinoma. The radiological findings of this tumour have been described in the literature; however, only limited data are available regarding the metastatic features of ACC of the liver, the most common metastatic site. We report a case of ACC of the pancreas with a hepatic metastasis from a benign-appearing malignant pancreatic lesion.
Collapse
Affiliation(s)
- Y J Kim
- Department of Radiology, St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | | | | | | |
Collapse
|
18
|
Bai SW, Jung HJ, Jeon MJ, Chung DJ, Kim SK, Kim JW. Surgical repair of anterior wall vaginal defects. Int J Gynaecol Obstet 2007; 98:147-50. [PMID: 17572421 DOI: 10.1016/j.ijgo.2007.04.019] [Citation(s) in RCA: 11] [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] [Received: 10/31/2006] [Revised: 03/29/2007] [Accepted: 04/11/2007] [Indexed: 11/30/2022]
Abstract
OBJECTIVE To compare the clinical efficacy of 3 surgical procedures for central types of anterior vaginal wall defect. METHODS A total of 138 patients diagnosed with central types of anterior vaginal wall defect who underwent classic transvaginal repair (n=72), transvaginal repair with polypropylene mesh (n=28), and internal repair (n=38) were followed up for at least 1 year. RESULTS There were no differences in development of fever, vaginal erosion, detrusor overactivity, and voiding difficulty among the 3 groups, but the incidence of postoperative urinary tract infections was significantly higher in the polypropylene mesh repair group. The difference in preoperative and postoperative hemoglobin levels and wound infection incidence were significantly higher in the internal repair group. Moreover, the recurrence rate of the anterior vaginal wall defect was significantly higher at 1 year in the internal repair group. CONCLUSION Transvaginal surgical repair seems to be more efficacious than internal surgical repair for central types of anterior vaginal wall defects.
Collapse
Affiliation(s)
- S W Bai
- Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Shinchon-dong, 134 Seodaemun-gu, Seoul 120-752, Korea.
| | | | | | | | | | | |
Collapse
|
19
|
Kim SK, Heo SJ, Koak JY, Lee JH, Lee YM, Chung DJ, Lee JI, Hong SD. A biocompatibility study of a reinforced acrylic-based hybrid denture composite resin with polyhedraloligosilsesquioxane. J Oral Rehabil 2007; 34:389-95. [PMID: 17441880 DOI: 10.1111/j.1365-2842.2006.01671.x] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Acrylic-based denture materials have several common weak points, such as shrinkage after curing, lack of strength and toxicity. In order to solve these problems, we adapted a hybrid system using acrylic polymer and polyhedraloligosilsesquioxane (POSS). The aim of the study was to investigate the biocompatibility of a reinforced acrylic-based hybrid denture composite resin with POSS. Specimens of a novel polymeric denture base resin, in which POSS was used to partially replace the commonly used base monomer, were fabricated. In order to examine changes in biocompatibility with time, fresh specimens, along with specimens soaked in distilled water for 24 and 72 h were fabricated. Three other types of acrylic denture base resins were used to prepare the resin specimens. Biocompatibility (as measured by a metabolic assay, an agar overlay test, and a mutagenesis assay) of the composites was tested. The metabolic and mutagenesis assays were conducted with pure culture medium as a control. In this study, the reinforced acrylic-based hybrid denture composite resin with POSS showed improved biocompatibility and lower mutagenicity than the control. Statistical examinations showed the cell metabolic activity of the novel polymeric denture base resin in the 72-h immersion case as having almost the same inclination as the control. We hope that these results might aid in the development of a reinforced acrylic-based denture resin.
Collapse
Affiliation(s)
- S K Kim
- Department of Prosthodontics and Dental Research Institute, College of Dentistry, Seoul National University, Seoul, Korea
| | | | | | | | | | | | | | | |
Collapse
|
20
|
Kim CM, Jeon MJ, Chung DJ, Kim SK, Kim JW, Bai SW. Risk factors for pelvic organ prolapse. Int J Gynaecol Obstet 2007; 98:248-51. [PMID: 17408669 DOI: 10.1016/j.ijgo.2007.02.019] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2007] [Revised: 02/22/2007] [Accepted: 02/22/2007] [Indexed: 11/24/2022]
Abstract
OBJECTIVES To evaluate the risk factors for pelvic organ prolapse (POP) and to determine the relationship between these risk factors and stage or other components of POP. METHODS 244 patients with primary POP and 314 women without POP were included. Age, parity, smoking, body mass index (BMI), menopause, and hormone replacement therapy (HRT) were investigated. RESULT Independent risk factors for POP included age over 70, parity higher than 3, and menopause. Age, parity, menopause, and HRT were significantly associated with stage of POP. Genital hiatus (GH) and perineal body (PB) showed a significant positive and negative correlation with age and parity, respectively. Menopause and HRT were also associated with them. CONCLUSION Age, parity and menopause are possible risk factors of POP and associated with the lengths of GH and PB in POP women. Further, these risk factors and HRT are significantly correlated with the severity of the disease.
Collapse
Affiliation(s)
- C M Kim
- Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Seoul, Korea
| | | | | | | | | | | |
Collapse
|
21
|
Kim CM, Oh YJ, Cho SH, Chung DJ, Hwang JY, Park KH, Cho DJ, Choi YM, Lee BS. Increased telomerase activity and human telomerase reverse transcriptase mRNA expression in the endometrium of patients with endometriosis. Hum Reprod 2006; 22:843-9. [PMID: 17077107 DOI: 10.1093/humrep/del425] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [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] Open
Abstract
BACKGROUND Endometriosis is considered a frequent, benign disease with the ability to undergo neoplastic processes. The aim of this study was to evaluate the limitless replication potential of the endometrium in patients with endometriosis by examining human telomerase reverse transcriptase (hTERT) mRNA expression and telomerase activity. METHODS Endometrium samples from 30 endometriosis patients and 30 patients without endometriosis were obtained via endometrial biopsy. The expression of hTERT mRNA was determined by real-time RT-PCR assay, and telomerase activity was measured by telomerase repeat amplification protocol (TRAP) assay. RESULTS The mean normalized hTERT (N hTERT) mRNA level was significantly higher in the endometriosis than in the control group (P = 0.013). The mean hTERT mRNA levels during the proliferative phase and during the secretory phase were higher in the endometriosis group than in the control group, although the difference was only significant for the secretory phase (P = 0.036). We found a prominent difference in endometrial telomerase activity between moderate-to-severe endometriosis and the control group (P = 0.048). The levels of hTERT mRNA and telomerase activity increased as the disease became more severe (P = 0.038, P = 0.016). CONCLUSIONS This study showed the overexpression of hTERT mRNA and telomerase activity in the endometrium of endometriosis patients. These finding suggest that replication potential of endometrial cells may have an important role in the pathogenesis of endometriosis.
Collapse
Affiliation(s)
- C M Kim
- Department of Obstetrics and Gynecology, Yonsei University College of Medicine, Yongdong Severance Hospital, Seoul, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Bai SW, Kwon HS, Chung DJ. Abdominal high uterosacral colpopexy and abdominal sacral colpopexy with mesh for pelvic organ prolapse. Int J Gynaecol Obstet 2005; 92:147-8. [PMID: 16325817 DOI: 10.1016/j.ijgo.2005.10.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2005] [Revised: 10/18/2005] [Accepted: 10/26/2005] [Indexed: 11/21/2022]
Affiliation(s)
- S W Bai
- Department of Obstetrics and Gynecology, Institute of Women's Life Science, Yonsei University, College of Medicine, Seoul, South Korea.
| | | | | |
Collapse
|
23
|
Bai SW, Sohn WH, Chung DJ, Park JH, Kim SK. Comparison of the efficacy of Burch colposuspension, pubovaginal sling, and tension-free vaginal tape for stress urinary incontinence. Int J Gynaecol Obstet 2005; 91:246-51. [PMID: 16242695 DOI: 10.1016/j.ijgo.2005.08.023] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [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: 07/01/2005] [Revised: 08/22/2005] [Accepted: 08/24/2005] [Indexed: 10/25/2022]
Abstract
OBJECTIVE To compare the cure rate and confirm the clinical efficacy of the 3 most frequently performed surgical procedures for stress urinary incontinence (SUI). METHODS Between January 2001 and May 2003, 92 women with SUI were randomly assigned to undergo the Burch colposuspension (n=33), pubovaginal sling (n=28), or tension-free vaginal tape (n=31) at the Department of Obstetrics and Gynecology, Yonsei Medical Center, Seoul, Korea. Patient characteristics, urodynamic study results, cure rates at 3, 6, and 12 months, and complication rates were compared using the chi2 test. RESULTS There were no statistically significant differences in the cure rates initially, but after 12 months the cure rate of the pubovaginal sling procedure was found to be significantly higher than those of the tension-free vaginal tape or Burch colposuspension procedures. CONCLUSION The cure rate of the pubovaginal sling procedure was significantly higher after 1 year, but no difference in efficacy was observed between the 2 other procedures. A randomized prospective study of a larger population should be conducted.
Collapse
Affiliation(s)
- S W Bai
- Department of Obstetrics and Gynecology, Institute of Women's Life Science, Yonsei University, Yonsei University College of Medicine, Seoul, Korea.
| | | | | | | | | |
Collapse
|
24
|
Abstract
We report a rare case of deciduoid peritoneal mesothelioma in a 47-year-old woman who had no history of asbestos exposure or previous surgery. Immunohistochemistry and electron microscopic findings showed that the tumor was a subtype of epithelioid mesothelioma. Awareness of this disease entity is helpful for the differential diagnosis of peritoneal masses.
Collapse
Affiliation(s)
- D J Chung
- Department of Radiology, University of Konyang College of Medicine, 685 Gasuwon-dong, Seo-gu, Daejeon 302-718, Korea
| | | | | | | | | | | | | |
Collapse
|
25
|
Chung SY, Ha HK, Kim JH, Kim KW, Cho N, Cho KS, Lee YS, Chung DJ, Jung HY, Yang SK, Min YI. Radiologic findings of Behçet syndrome involving the gastrointestinal tract. Radiographics 2001; 21:911-24; discussion 924-6. [PMID: 11452065 DOI: 10.1148/radiographics.21.4.g01jl19911] [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: 11/11/2022]
Abstract
Behçet syndrome is characterized by the histopathologic finding of nonspecific vasculitis in multiple organs. The diagnosis is usually made on the basis of the combination of clinical signs and symptoms. This disease involves the gastrointestinal tract in 10%-50% of patients, and the terminal ileum and cecum are chiefly affected. Barium study is useful in demonstrating the characteristic radiographic features of Behçet syndrome involving the gastrointestinal tract. The presence of deep, penetrating ulcers results in a high rate of complications, such as perforation, fistula, hemorrhage, and peritonitis. Furthermore, recurrence of disease adjacent to or at the surgical anastomosis is common. Computed tomography is useful in determining the extent of the lesions and in identifying cases in which complications are likely to occur. Familiarity with the various radiologic findings of Behçet syndrome involving the gastrointestinal tract helps in making an early diagnosis, as well as in establishing an appropriate treatment strategy.
Collapse
Affiliation(s)
- S Y Chung
- Departments of Diagnostic Radiology, Asan Medical Center, University of Ulsan College of Medicine, 388-1 Poongnap-Dong, Songpa-Ku, Seoul 138-736, Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Lee DH, Lee JU, Kang DG, Paek YW, Chung DJ, Chung MY. Increased vascular endothelin-1 gene expression with unaltered nitric oxide synthase levels in fructose-induced hypertensive rats. Metabolism 2001; 50:74-8. [PMID: 11172478 DOI: 10.1053/meta.2001.19527] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 11/11/2022]
Abstract
The present study aimed to investigate whether altered expression levels of endothelin-1 (ET-1) and nitric oxide synthase (NOS) are related to the development of insulin-resistant hypertension. Male Sprague-Dawley rats were fed a fructose-rich diet for 5 weeks. Systolic blood pressure significantly increased in fructose-fed rats. While serum free fatty acid (FFA) and plasma nitrite/nitrate (NOx) levels did not significantly differ between the fructose-fed and control groups, plasma insulin and serum triglyceride (TG) concentrations significantly increased in the former. ET-1 mRNA expression in the aorta increased to 195% in fructose-fed rats. Neither the protein expression of constitutive NOS (cNOS) nor that of inducible NOS (iNOS) were significantly affected by fructose feeding. However, NOx levels in the aorta were significantly increased. These results indicate that an increased expression of vascular ET-1 may be causally related to the development of hypertension in fructose-fed rats. However, an altered role of the vascular nitric oxide (NO) pathway may not be primarily involved in the development of fructose-induced hypertension.
Collapse
Affiliation(s)
- D H Lee
- Department of Physiology, Chonnam National University Medical School, Kwangju, South Korea
| | | | | | | | | | | |
Collapse
|
27
|
Abstract
Pituitary apoplexy has been reported as a very rare complication of combined tests of anterior pituitary function and of TRH or gonadotropin-releasing hormone (GnRH) administration in pituitary tumor. A 34-year-old man with a GH-secreting pituitary macroadenoma and diabetes mellitus received an injection of 400 microg TRH, 100 microg GnRH, and 0.15 U/Kg regular insulin. Twenty minutes later, he complained of a severe headache and vomited. Visual acuity and visual field did not change and his headache was persistent during the next 24 hours of conservative management. Magnetic resonance imaging (MRI) of the sella turcica done the day after the event showed definitive elevation of the optic chiasm and slight enlargement of tumor and focal areas of mixed high signal and low signal intensities in the macroadenoma on noncontrast T1-weighted images. Headache subsided markedly within a day of octreotide therapy. Transsphenoidal removal of the pituitary tumor was performed 9 days after the hormone study. Ischemic necrosis and hemorrhage were confirmed in the acidophilic adenoma with positive immunostaining for GH. Postoperative course was uneventful and his serum insulin-like growth factor-1 (IGF-1) level and blood glucose levels were normalized. Three months after the surgery the dynamic test was repeated without adverse effects. To our knowledge, this is a very rare case of apoplexy of GH-secreting pituitary adenoma after a combined stimulation test of anterior pituitary function.
Collapse
Affiliation(s)
- D H Lee
- Department of Internal Medicine, Chonnam National University Medical School, Kwangju, Korea
| | | | | | | | | | | | | |
Collapse
|
28
|
Liu WC, Kwak BK, Kim KN, Kim SY, Woo JJ, Chung DJ, Hong JH, Kim HS, Lee CJ, Shim HJ. Tuberculous aneurysm of the abdominal aorta: endovascular repair using stent grafts in two cases. Korean J Radiol 2000; 1:215-8. [PMID: 11752958 PMCID: PMC2718204 DOI: 10.3348/kjr.2000.1.4.215] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Tuberculous aneurysm of the aorta is exceedingly rare. To date, the standard therapy for mycotic aneurysm of the abdominal aorta has been surgery involving in-situ graft placement or extra-anatomic bypass surgery followed by effective anti-tuberculous medication. Only recently has the use of a stent graft in the treatment of tuberculous aortic aneurysm been described in the literature. We report two cases in which a tuberculous aneurysm of the abdominal aorta was successfully repaired using endovascular stent grafts. One case involved is a 42-year-old woman with a large suprarenal abdominal aortic aneurysm and a right psoas abscess, and the other, a 41-year-old man in whom an abdominal aortic aneurysm ruptured during surgical drainage of a psoas abscess.
Collapse
Affiliation(s)
- W C Liu
- Department of Radiology, Sung-Ae General Hospital, Seoul, Korea.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Abstract
We report a case of non-Hodgkin's lymphoma(NHL) with simultaneous involvement of both thyroid and bilateral adrenal glands. Literature review on a computerized search showed that this is an extremely rare condition. The final diagnosis of diffuse large B cell lymphoma was confirmed by biopsies of thyroid gland, enlarged cervical lymph node, and adrenal gland. The significant endocrine dysfunction of the thyroid, adrenal or other endocrine glands was absent in our case. The patient responded dramatically to three cycles of chemotherapy with no complication or endocrine dysfunction and continues to be followed.
Collapse
Affiliation(s)
- D H Lee
- Department of Internal Medicine, Chonnam University Medical School, Kwangju, Korea
| | | | | | | | | | | | | |
Collapse
|
30
|
Ahn YK, Jeong MH, Bom HS, Park JC, Kim JK, Chung DJ, Chung MY, Cho JG, Kang JC. Myocardial infarction with Moyamoya disease and pituitary gigantism in a young female patient. Jpn Circ J 1999; 63:644-8. [PMID: 10478817 DOI: 10.1253/jcj.63.644] [Citation(s) in RCA: 6] [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] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Myocardial infarction is very rare in young female patients with systemic vascular disorders. Moyamoya disease is a cerebrovascular disease associated with an abnormal vascular network. This report presents a 19-year-old female patient who suffered from chest pain and exertional dyspnea for 2 months prior to admission. She had a history of Moyamoya disease and pituitary gigantism since childhood. Her ejection fraction on echocardiogram was 20% and a perfusion defect with partial reversibility in the anterior wall was demonstrated on stress single photon emission computed tomography (SPECT). Diagnostic coronary angiogram revealed critical stenosis in the middle left anterior descending artery, which was treated by coronary stenting. Her subjective symptoms were relieved and the perfusion defect seen on SPECT decreased after coronary intervention.
Collapse
Affiliation(s)
- Y K Ahn
- Department of Internal Medicine, Chonnam University Medical School, Dong Ku, Kwang, Korea
| | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Abstract
A redox-sensitive protein that binds to the 3' untranslated region (UTR) of manganese superoxide dismutase (MnSOD) RNA has been described previously [Fazzone, H., Wangner, A., and Clerch, L. B. (1993) J. Clin. Invest. 92, 1278-1281; Chung, D. J., and Clerch, L. B. (1997) Am. J. Physiol. 16, L714-L719]. In the present study, cross-competition gel retardation and RNase H assays were used to identify a 41-base region located 111 bases downstream of the stop codon as the 3' UTR cis element involved in protein binding. The base sequence of this region is approximately 75% conserved among the 3' UTRs of rat, mouse, cow, and human MnSOD mRNAs at approximately the same distance downstream of the stop codon. The role of this protein-binding region in RNA translation was assessed in an in vitro rabbit reticulocyte lysate system. Translation of MnSOD RNA from which the 3' UTR element was deleted decreased 60% compared with translation of MnSOD RNA containing the 3' UTR cis element. In the presence of a specific competitor oligoribonucleotide that inhibits MnSOD RNA protein-binding activity, translation of MnSOD RNA containing the 3' UTR was decreased by 65%. Thus, both the cis element and RNA protein-binding activity were required for more efficient translation of the MnSOD. An analysis of ribosomal profiles suggests the MnSOD RNA-binding protein participates in the formation of the translation initiation complex. When MnSOD RNA-binding activity was inhibited, initiation complex formation was decreased by 50%. From the data obtained in this study, we propose that the 3' UTR cis element of MnSOD through its interaction with MnSOD RNA-binding protein may function as a translational enhancer.
Collapse
Affiliation(s)
- D J Chung
- Lung Biology Laboratory, Department of Physiology and Biophysics, Georgetown University School of Medicine, Washington, D.C. 20007, USA
| | | | | |
Collapse
|
32
|
Sohn J, Lee CH, Chung DJ, Park SH, Kim I, Hwang WI. Effect of petroleum ether extract of Panax ginseng roots on proliferation and cell cycle progression of human renal cell carcinoma cells. Exp Mol Med 1998; 30:47-51. [PMID: 9873822 DOI: 10.1038/emm.1998.7] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Panax ginseng roots have long been used as a medicinal herb in oriental countries. We have investigated anti-proliferative effects of lipid soluble Panax ginseng components on human renal cancer cell lines. Petroleum ether extract of Panax ginseng roots (GX-PE) or its partially purified preparation (7:3 GX) was added to cultures of three human renal cell carcinoma (RCC) cell lines, A498, Caki-1, and CURC II. Proliferation of RCC cells was estimated by a [3H]thymidine incorporation assay and cell cycle distribution was analyzed by flow cytometry. GX-PE, 7:3 GX, panaxydol and panaxynol inhibited proliferation of all three RCC cell lines in a dose dependent manner in vitro with an order of potency, 7:3 GX > panaxydol > panaxynol = GX-PE. Additive effect of interleukin 4 was also demonstrated, most prominently in Caki-1 which responded poorly to GX-PE alone. Analysis of cell cycle in CURC II and Caki-1 treated with GX-PE demonstrated increase in G1 phase population and corresponding decrease in S phase population. The present study demonstrated that proliferation of human RCC cell lines were inhibited by lipid soluble components of Panax ginseng roots by blocking cell cycle progression at G1 to S phase transition.
Collapse
Affiliation(s)
- J Sohn
- Department of Biochemistry, Korea University College of Medicine, Seoul, Korea
| | | | | | | | | | | |
Collapse
|
33
|
Abstract
A redox-sensitive protein in rat lung binds to the 3'-untranslated region (3'-UTR) of manganese superoxide dismutase (Mn-SOD) mRNA; the activity of this Mn-SOD RNA-binding protein (Mn-SOD-BP) is greater in 12,000-g supernatant fractions (S12) from neonates than in S12 from adults (H. Fazzone, A. Wangner, and L. B. Clerch. J. Clin. Invest. 92: 1278-1281, 1993). To determine the mechanism underlying this developmental difference, lung subcellular fractions were tested for their effect on Mn-SOD-BP activity. Protein in the 130,000-g supernatant (S130) of lung extracts bound the 3'-UTR. However, the developmental difference in binding was not present in S130. The 130,000-g pellet (P130) did not bind the 3'-UTR; rather, it contained an inhibitor of Mn-SOD-BP activity. Addition of P130 to S130 decreased RNA binding in a dose-dependent manner. Furthermore, adult P130 was a more potent inhibitor of RNA-binding activity than neonatal P130. These data indicate that the developmental difference in Mn-SOD-BP activity is due, in part, to an inhibitor in P130. Biochemical characterization revealed that the inhibitor is an RNA that may participate in the posttranscriptional control of Mn-SOD gene expression.
Collapse
Affiliation(s)
- D J Chung
- Department of Physiology, Georgetown University School of Medicine, Washington, District of Columbia 20007, USA
| | | |
Collapse
|
34
|
Abstract
Lipopolysaccharide (LPS), a component of the cell wall of Gram-negative bacteria, interacts with eukaryotic cells, causing changes in gene expression and a rapid increase in the formation of superoxide and H2O2. We now report that, within 6 h of treating rats with LPS, there was a divergent response in the lung of manganese superoxide dismutase (Mn-SOD) and catalase expression without a change in expression of copper-zinc superoxide dismutase or glutathione peroxidase. The activity and mRNA concentration of Mn-SOD increased during the time catalase mRNA concentration and activity decreased. These divergent changes and activation of nuclear factor-kappa B (NF-kappa B) were preceded by a fall, 1 h after LPS treatment, in the RNA binding activity of two redox-sensitive proteins: Mn-SOD RNA binding protein and catalase RNA binding protein. The rapid onset of these changes, the bacteriostatic properties of H2O2, and the signaling function of NF-kappa B suggest that the divergent expression of Mn-SOD and catalase is a coordinated component of the acute phase reaction to bacterial invasion.
Collapse
Affiliation(s)
- L B Clerch
- Department of Pediatrics and Medicine, Georgetown University School of Medicine, Washington, District of Columbia 20007, USA
| | | | | | | |
Collapse
|
35
|
Abstract
Rat lung extract contains protein that binds to a cis element in the 3' untranslated region of glutathione peroxidase (GPx) mRNA; this region is located 200 bases downstream of the stop codon and 77 bases downstream of the selenocysteine insertion sequence. GPx mRNA-binding protein (GPx-BP) has the following characteristics in common with Mn superoxide dismutase mRNA-binding protein (MnSOD-BP): 1. RNA-binding activity is redox-sensitive; free sulfhydryl groups on the protein are required for binding. 2. RNA-binding activity is enriched in a 130,000 x g supernatant fraction and is inhibited by RNA in the polysomal fraction. 3. The MnSOD and GPx cis elements compete with each other for protein binding. 4. UV crosslinking studies with each probe reveal a [32P]-labeled protein of the same apparent molecular mass, 56 kDa. These observations provide evidence that MnSOD and GPx RNAs bind the same protein.
Collapse
Affiliation(s)
- L B Clerch
- Georgetown University School of Medicine, Lung Biology Laboratory, Washington, DC 20007, USA
| | | | | |
Collapse
|
36
|
Cheon J, Chung DJ, Kim JJ, Koh SK, Sohn J. Inhibitory effects of interleukin-4 on human renal cell carcinoma cells in vitro: in combination with interferon-alpha, tumor necrosis factor-alpha or interleukin-2. Int J Urol 1996; 3:196-201. [PMID: 8776617 DOI: 10.1111/j.1442-2042.1996.tb00516.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
BACKGROUND Immune cytokines have been shown to play important roles in regulating the growth of neoplastic cells, as well as the function of immune cells. The present study assessed the effects of interleukin (IL)-4 alone, and in combination with recombinant interferon (IFN)-alpha 2b, or with IL-2, or with tumor necrosis factor (TNF)-alpha on the in vitro proliferation of human renal cell carcinoma (RCC) cell-lines. METHODS Growth-inhibitory effects of IL-4 alone, and in combination with other cytokines, on three human RCC cell-lines, Caki-1, CURC-II, and A-498, were measured by the [3H]thymidine incorporation assay. RESULTS IL-4 inhibited proliferation of all three human RCC cell-lines (P < 0.001). The maximum growth inhibition of RCC cell-lines by IL-4 alone was observed at the concentration of 1 to 3 ng/mL, depending on the cell-line. Antihuman IL-4 antisera was able to reverse the growth-inhibitory effects of IL-4 on Caki-1 in a dose-dependent manner, proving that the growth inhibition was mediated by IL-4 itself. When other cytokines were added in combination with IL-4, only IFN-alpha 2b resulted in significant additional growth inhibition (P < 0.005). However, when the proliferation was compared to that of RCC cells that were not treated with any cytokine, all combinations produced marked growth inhibition. CONCLUSION Our data suggest that IL-4 alone, or in combination with IFN-alpha 2b, can be used to develop new strategies for treatment of human RCC.
Collapse
Affiliation(s)
- J Cheon
- Department of Urology, Korea University College of Medicine, Seoul, Korea
| | | | | | | | | |
Collapse
|
37
|
Abstract
Grooved and holed surfaces with a well fabricated design may serve as microsubstrates for cell culture and microreactors for diagnosis. In this study, the authors prepared chemically treated, micrometer scale grooved and holed glass surfaces by combined surface modification and ultraviolet (UV) excimer laser ablation techniques, as follows. 1) Microcell-culture substrate: Amino group attached glass surfaces, prepared by the treatment with an aminopropylsilane, were condensed with a carboxylated radical initiator. Subsequently, polyacrylamide was grafted by surface initiated radical polymerization to create a very hydrophilic surface layer. Ultraviolet excimer laser beams (KrF: 248 nm) were irradiated through a microscope onto surfaces to create grooves or holes that were 10 and 50 microns in width or diameter, respectively. The depth, depending on the irradiation light strength, ranged from a few to several tenths of a micrometer. On endothelial cell (EC) seeding, ECs adhered and grew on the bottoms of the grooved or holed surface where glass was exposed on ablation. Little cell adhesion was observed on non ablated, grafted surfaces. Endothelial cells aligned along the groove, resulting in very narrow tube like tissue formation, whereas ECs tended to form a multilayered spherical aggregate in a hole. A single cell resided in a 10 microns square hole. 2) Microreactor for diagnosis: The glass surface, treated with a fluorinated silane, was ablated to create round holes. On addition of a few microliters of water, water could be quantitatively transferred into a hole because of the water repellent characteristics of non ablated, fluorinated glass. As a model of a microreactor, enzyme reactions to affect different levels of glucose were carried out in tiny holed surfaces.
Collapse
Affiliation(s)
- T Matsuda
- Department of Bioengineering, National Cardiovascular Center Research Institute, Osaka, Japan
| | | |
Collapse
|
38
|
Abstract
To synthesize a glucose-sensitive insulin-releasing protein device, insulin was esterified with methanol and connected to glucose oxidase with intervention of a disulfide compound, 5,5'-dithiobis(2-nitrobenzoic acid). On adding glucose to an aqueous solution containing the hybrid enzyme, the modified insulin was released. The amount of insulin released increased with increasing concentration of added glucose. The insulin release from the hybrid enzyme was specific to glucose. The activity of released insulin was about 80% of the unmodified insulin.
Collapse
Affiliation(s)
- Y Ito
- Department of Polymer Chemistry, Faculty of Engineering, Kyoto University, Japan
| | | | | |
Collapse
|
39
|
Abstract
Trypsin was modified with various vinyl polymers by the graft polymerization of vinyl monomers using a trypsin derivative containing aliphatic azo groups as the initiator. The graft polymers were chosen to be sensitive to external signals, e.g., a redox-sensitive poly[3-carbamoyl-1-(p-vinylbenzyl)pyridinium chloride] and a pH-sensitive poly(methacrylic acid-co-methyl methacrylate). The trypsin modified with the redox-sensitive polymer became insoluble in water in the presence of Na2S2O4, and redissolved when H2O2 was added. However, the enzymatic activity of the homogeneous solution was not proportional to the concentration of the modified trypsin remaining in the solution. The trypsin modified with the pH-sensitive polymer was insoluble and soluble in acidic and neutral solutions, respectively. The enzymatic activity of the homogeneous solution changed reversibly with pH in proportion to the concentration of the modified trypsin remaining in the solution.
Collapse
Affiliation(s)
- Y Ito
- Department of Polymer Chemistry, Faculty of Engineering, Kyoto University, Japan
| | | | | | | |
Collapse
|
40
|
Chung DJ. [Prospect of welfare programs for the aged in Korea]. Taehan Kanho 1985; 24:15-8. [PMID: 3848582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|