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Fu Y, Huang SS, Wang QQ, Han MY, Wang GJ, Kang DY, Dai P, Yuan YY. [Using PGT to give birth to hereditary conductive deafness SYNS1 family a healthy offspring: a case report]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2024; 59:243-248. [PMID: 38561263 DOI: 10.3760/cma.j.cn115330-20230925-00116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Affiliation(s)
- Y Fu
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China Department of Otorhinolaryngology, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, Qingdao 266035, China
| | - S S Huang
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China
| | - Q Q Wang
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China
| | - M Y Han
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China
| | - G J Wang
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China
| | - D Y Kang
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China
| | - P Dai
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China
| | - Y Y Yuan
- National Clinical Research Center for Otolaryngologic Diseases, College of Otolaryngology-Head and Neck Surgery, Sixth Medical Center of the PLA General Hospital, Beijing 100037, China
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Yang JY, Wang QQ, Han MY, Huang SS, Kang DY, Zhang X, Yang SY, Dai P, Yuan YY. [Phenotype-genotype analysis of the autosomal recessive hereditary hearing loss caused by OTOA variations]. Zhonghua Er Bi Yan Hou Tou Jing Wai Ke Za Zhi 2023; 58:460-469. [PMID: 37114731 DOI: 10.3760/cma.j.cn115330-20220620-00361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Objective: To analyze the phenotypic-genotypic characteristics of hereditary deafness caused by OTOA gene variations. Methods: Family histories, clinical phenotypes and gene variations of six pedigrees were analyzed, which were diagnosed with hearing loss caused by OTOA gene variations at the PLA General Hospital from September 2015 to January 2022. The sequence variations were verified by Sanger sequencing and the copy number variations were validated by multiplex ligation-dependent probe amplification (MLPA) in the family members. Results: The hearing loss phenotype caused by OTOA variations ranged from mild to moderate in the low frequencies, and from moderate to severe in the high frequencies in the probands, which came from six sporadic pedigrees, among which a proband was diagnosed as congenital deafness and five were diagnosed as postlingual deafness. One proband carried homozygous variations and five probands carried compound heterozygous variations in OTOA gene. Nine pathogenic variations (six copy number variations, two deletion variations and one missense variation) and two variations with uncertain significance in OTOA were identified in total, including six copy number variations and five single nucleotide variants, and three of the five single nucleotide variants were firstly reported [c.1265G>T(p.Gly422Val),c.1534delG(p.Ala513Leufs*11) and c.3292C>T(p.Gln1098fs*)]. Conclusions: OTOA gene variations can lead to autosomal recessive nonsyndromic hearing loss. In this study, the hearing loss caused by OTOA defects mostly presents as bilateral, symmetrical, and postlingual, and that of a few presents as congenital. The pathogenic variations of OTOA gene are mainly copy number variations followed by deletion variations and missense variations.
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Affiliation(s)
- J Y Yang
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - Q Q Wang
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - M Y Han
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - S S Huang
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - D Y Kang
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - X Zhang
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - S Y Yang
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - P Dai
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
| | - Y Y Yuan
- Department of Otomicrosurgery, College of Otolaryngology Head and Neck Surgery, the Sixth Medical Center of Chinese PLA General Hospital, National Clinical Research Center for Otolaryngologic Diseases, Beijing 100048, China
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Sung M, Kim DH, Jee HM, Kim JH, Ha EK, Shin YH, Han MY. Urine phthalate levels were associated with skin barrier dysfunction and atopic sensitization in children. Eur Rev Med Pharmacol Sci 2023; 27:2888-2898. [PMID: 37070889 DOI: 10.26355/eurrev_202304_31920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
Abstract
OBJECTIVE Phthalates can cause immunological disorders and aggravate allergic diseases. Thus, we investigated the relationship between urinary phthalate, skin barrier function, and atopic sensitization in children. PATIENTS AND METHODS In total, 448 school children [334 with severe allergic disease; and 123 with severe atopic dermatitis (AD)] aged 10-12 years were enrolled in this study between June and July 2017. Four high-molecular-weight phthalates (HMWP) [Σ4HMWP] and three low-molecular-weight phthalates (LMWP) [Σ3LMWP] metabolites in urine samples, specific immunoglobulin E (IgE), and total eosinophil count were measured. Four-part trans epidermal water loss (TEWL) (cheek, leg, and upper/lower arm; Σ4TEWL) was measured to evaluate the skin barrier function. RESULTS After adjusting for confounding variables, Σ4TEWL was significantly associated with the quartiles of urinary Σ4HMWP [adjusted β=7.897, 95% confidence interval (CI): 0.636-15.158, p=0.033] and Σ3LMWP (adjusted β=9.670, 95% CI: 2.422-16.919, p=0.009). The adjusted analyses revealed that the quartiles of urinary Σ4HMWP and Σ3LMWP were not significantly associated with total eosinophil count, atopic sensitization, and severe AD (p>0.05). According to the quartiles of urinary Σ4HMWP and Σ3LMWP, there were significant differences in the TEWL of the lower arm and leg (p<0.05) but not in cheek and upper arm. CONCLUSIONS Exposure to HMWPs and LMWPs was significantly associated with skin barrier dysfunction but not with atopic sensitization. These results suggest that children exposed to phthalates may be more susceptible to fragile skin barrier function.
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Affiliation(s)
- M Sung
- Department of Pediatrics, Soonchunhyang University Gumi Hospital, Gumi, Republic of Korea.
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Sung M, Jee HM, Kim JH, Ha EK, Shin YH, Kim JH, Lim DH, Han MY. Serum vitamin D level mitigates fractional exhaled nitric oxide linked to bisphenol-A in school-aged children. Eur Rev Med Pharmacol Sci 2022; 26:1640-1647. [PMID: 35302211 DOI: 10.26355/eurrev_202203_28232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
OBJECTIVE Previous studies on the relationship of bisphenol-A (BPA) with fractional exhaled nitric oxide (FeNO) had conflicting results, suggesting that other factors may modulate this relationship. Thus, we investigated the modulating effect of vitamin D on the relationship of BPA with FeNO in children. PATIENTS AND METHODS This study recruited 432 children (10 to 12 years old) from the general pediatric population of Korea between June and July 2017. We conducted measurements of urinary BPA, serum vitamin D, specific serum IgE, FeNO, and data from impulse oscillometry (reactance area [AX], airway resistance at 5 Hz [Rrs5] and 20 Hz [Rrs10], and the difference of Rrs5 and Rrs20 [Rrs5-20]). RESULTS Serum vitamin D (adjusted β =- 0.014, p=0.002) and urinary BPA (β = 0.006, p<0.001) level was significantly associated with FeNO. Urinary BPA level was significantly associated with FeNO in children with low vitamin D levels (≤23 ng/mL; αβ = 0.006, p < 0.001), but not in children with high vitamin D levels (>23 ng/mL). The interaction of vitamin D and BPA had a significant effect on FeNO (pint = 0.005). There was no relationship with the airway lung function (Rrs5, AX, and Rrs5-20) to serum vitamin D and urinary BPA level. Vitamin D ameliorated the BPA-mediated increase of FeNO in children. CONCLUSIONS These results suggest that children with low vitamin D levels may be more susceptible to airway inflammation due to BPA.
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Affiliation(s)
- M Sung
- Department of Pediatrics, Soonchunhyang University Gumi Hospital, Gumi, Republic of Korea.
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Han MY. Could Immunoglobulin Level Be a Prognostic Factor for Coronary Artery Lesions in Kawasaki Diseases? Korean Circ J 2021; 51:279-280. [PMID: 33655728 PMCID: PMC7925965 DOI: 10.4070/kcj.2021.0046] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Accepted: 02/15/2021] [Indexed: 11/22/2022] Open
Affiliation(s)
- Mi Young Han
- Department of Pediatrics, Kyung Hee University Hospital, Seoul, Korea.
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Affiliation(s)
- Jeong Hye Chae
- Dongnam Institute of Radiogical & Medical Sciences, Jangan, Korea
| | | | - Mi Young Han
- Department of Nursing, Silla University, Busan, Korea
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Choi YJ, Han MY, Lee EH. Children with transient loss of consciousness: Clinical characteristics and the effectiveness of diagnostic tests. Pediatr Neonatol 2020; 61:584-591. [PMID: 32680815 DOI: 10.1016/j.pedneo.2020.06.006] [Citation(s) in RCA: 2] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 04/16/2020] [Accepted: 06/15/2020] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Transient loss of consciousness (TLOC) is common among children and adolescents. The aims of this study were to identify clinical differences between patients with vasovagal syncope and those with epileptic seizures, which account for a large proportion of TLOC cases, and to evaluate the effectiveness of various diagnostic tests. METHODS The medical records of 160 children and adolescents with TLOC were analyzed retrospectively, and age, sex, clinical symptoms, and trigger factors were recorded. The cardiological and neurological evaluations performed included electrocardiograms, computed tomography scanning, magnetic resonance imaging, electroencephalograms (EEGs), echocardiograms, and head-up tilt tests (HUTTs). Overall assessments of the 160 patients generated final diagnoses. RESULTS The mean age of patients was 14.6 years old and TLOC occurred more frequently among girls (59.4%). The most common final diagnosis was vasovagal syncope (n = 102, 63.4%), followed by undetermined (n = 21, 13.1%) and epileptic seizures (n = 17, 10.6%). There were many other diagnoses, including cardiogenic syncope (1.3%). Patients diagnosed with vasovagal syncope were much more likely to have dizziness or light-headedness and blurred vision as pre-symptoms (p < 0.05), whereas patients diagnosed with epileptic seizures were more likely to have convulsions as an accompanying sign (p < 0.05). In addition, standing up was the most significant trigger factor for TLOC among those diagnosed with vasovagal syncope (p < 0.05). The sensitivity, specificity, and accuracy of the HUTT for vasovagal syncope were 95.1%, 75.0%, and 91.8%, respectively. Similarly, the sensitivity, specificity, and accuracy of EEGs for epileptic seizures were 80.0%, 70.6%, and 80.0%, respectively. CONCLUSION Vasovagal syncope and epileptic seizures should be considered as possible causes of most cases of TLOC in children and adolescents. An accurate case history and appropriate evaluation are essential for correct diagnoses.
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Affiliation(s)
- Young Ju Choi
- Department of Pediatrics, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Mi Young Han
- Department of Pediatrics, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Eun Hye Lee
- Department of Pediatrics, College of Medicine, Kyung Hee University, Seoul, Republic of Korea.
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Lee EH, Han MY. Transcatheter Patent Foramen Ovale Closure in a Child with Cryptogenic Ischemic Stroke. Indian J Pediatr 2020; 87:653. [PMID: 32048224 DOI: 10.1007/s12098-020-03243-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 02/05/2020] [Indexed: 11/25/2022]
Affiliation(s)
- Eun Hye Lee
- Department of Pediatrics, College of Medicine, Kyung Hee University Hospital, Seoul, South Korea.
| | - Mi Young Han
- Department of Pediatrics, College of Medicine, Kyung Hee University Hospital, Seoul, South Korea
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Min DE, Kim DH, Han MY, Cha SH, Yoon KL. High antistreptolysin O titer is associated with coronary artery lesions in patients with Kawasaki disease. Korean J Pediatr 2018; 62:235-239. [PMID: 30404429 PMCID: PMC6584233 DOI: 10.3345/kjp.2018.06989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Accepted: 11/06/2018] [Indexed: 11/27/2022]
Abstract
Purpose In Kawasaki disease (KD) patients, coronary artery complications, incomplete and refractory types occur more frequently in patients with streptococcal or other bacterial/viral infections. Recently, we observed a higher incidence of coronary lesions in KD patients with high anti-streptolysin O (ASO) titer. Therefore, we hypothesized that KD patients diagnosed with concurrent streptococcal infection have poor prognoses, with respect to treatment response and development of coronary artery lesions. Methods A retrospective review was performed in 723 patients with KD who were admitted to 2 major hospitals between June 2010 and September 2017. Results Among 723 patients with KD, 11 initially showed an elevated ASO titer (>320 IU/mL) or elevated follow-up ASO titer after treatment. Of these patients, 5 showed no response to the first intravenous immunoglobulin treatment, 3 had abnormalities of the coronary arteries. This is a significantly higher proportion of patients with a high ASO titer (n=3, 27.3%) than those with a normal ASO titer (n=53 [7.4%], P=0.047). A severe clinical course was seen in 81.8% of patients in the high ASO group versus 14.5% of patients in the normal ASO group. Conclusion It is not certain whether acute streptococcal infection may cause KD, but this study revealed that KD with high ASO titers showed higher rates of severe clinical course. It may be helpful to analyze concurrent streptococcal infection in patients with a severe clinical course.
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Affiliation(s)
- Dong Eun Min
- Department of Pediatrics,, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Do Hee Kim
- Department of Pediatrics,, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics,, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Sung Ho Cha
- Department of Pediatrics,, College of Medicine, Kyung Hee University, Seoul, Korea
| | - Kyung Lim Yoon
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea
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Chen B, Han MY, Peng K, Zhou SL, Shao L, Wu XF, Wei WD, Liu SY, Li Z, Li JS, Chen GQ. Global land-water nexus: Agricultural land and freshwater use embodied in worldwide supply chains. Sci Total Environ 2018; 613-614:931-943. [PMID: 28946381 DOI: 10.1016/j.scitotenv.2017.09.138] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 09/13/2017] [Accepted: 09/14/2017] [Indexed: 06/07/2023]
Abstract
As agricultural land and freshwater inextricably interrelate and interact with each other, the conventional water and land policy in "silos" should give way to nexus thinking when formulating the land and water management strategies. This study constructs a systems multi-regional input-output (MRIO) model to expound global land-water nexus by simultaneously tracking agricultural land and freshwater use flows along the global supply chains. Furthermore, land productivity and irrigation water requirements of 160 crops in different regions are investigated to reflect the land-water linkage. Results show that developed economies (e.g., USA and Japan) and major large developing economies (e.g., mainland China and India) are the overriding drivers of agricultural land and freshwater use globally. In general, significant net transfers of these two resources are identified from resource-rich and less-developed economies to resource-poor and more-developed economies. For some crops, blue water productivity is inversely related to land productivity, indicating that irrigation water consumption is sometimes at odds with land use. The results could stimulus international cooperation for sustainable land and freshwater management targeting on original suppliers and final consumers along the global supply chains. Moreover, crop-specific land-water linkage could provide insights for trade-off decisions on minimizing the environmental impacts on local land and water resources.
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Affiliation(s)
- B Chen
- Laboratory of Systems Ecology and Sustainability Science, College of Engineering, Peking University, Beijing 100871, China
| | - M Y Han
- Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, PR China
| | - K Peng
- Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - S L Zhou
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, PR China
| | - L Shao
- School of Humanities and Economic Management, China University of Geosciences, Beijing 100083, People's Republic of China
| | - X F Wu
- Economics School, Zhongnan University of Economics and Law, Wuhan 430073, China
| | - W D Wei
- Business School, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - S Y Liu
- Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao 066004, PR China
| | - Z Li
- Laboratory of Systems Ecology and Sustainability Science, College of Engineering, Peking University, Beijing 100871, China
| | - J S Li
- State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, PR China; Department of New Energy Science and Engineering, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
| | - G Q Chen
- Laboratory of Systems Ecology and Sustainability Science, College of Engineering, Peking University, Beijing 100871, China.
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Jeong SW, Kim DH, Han MY, Cha SH, Yoon KL. An infant presenting with Kawasaki disease following immunization for influenza: A case report. Biomed Rep 2018; 8:301-303. [PMID: 29564128 DOI: 10.3892/br.2018.1043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 06/12/2017] [Indexed: 02/03/2023] Open
Abstract
Kawasaki disease (KD) is a childhood vascular disorder of unknown etiology. Concerns have recently been raised regarding vaccinations as a potential risk factor for KD. In addition, various forms of vasculitis have been reported as adverse events following administration after various vaccines. Patients exhibiting post vaccination KD have previously been described; however, thus far, to the best of our knowledge, only one patient exhibiting post influenza vaccination KD has been reported in Japan. The present study describes a case of KD 24 h after immunization with influenza in an infant (age, 18 months) following 6 days of high fever, a body rash that had persisted for 2 days and nonsuppurative bilateral conjunctivitis. To the best of the authors' knowledge, this is the first reported case in Korea and the present study reviews various recent studies regarding vasculitis following vaccination and the causal association between them.
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Affiliation(s)
- Seung Woo Jeong
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul 05278, Republic of Korea
| | - Do Hee Kim
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul 05278, Republic of Korea
| | - Mi Young Han
- Department of Pediatrics, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul 02447, Republic of Korea
| | - Sung-Ho Cha
- Department of Pediatrics, Kyung Hee University Hospital, Kyung Hee University School of Medicine, Seoul 02447, Republic of Korea
| | - Kyung Lim Yoon
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul 05278, Republic of Korea
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Yoon KL, Lee HY, Yu JJ, Lee JY, Han MY, Kim KY, Huh J. Multicenter, Single-Arm, Phase IV Study of Combined Aspirin and High-Dose "IVIG-SN" Therapy for Pediatric Patients with Kawasaki Disease. Korean Circ J 2017; 47:209-214. [PMID: 28382076 PMCID: PMC5378027 DOI: 10.4070/kcj.2016.0139] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Revised: 06/14/2016] [Accepted: 11/22/2016] [Indexed: 11/11/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Intravenous immunoglobulin-SN (IVIG-SN) is a new human immunoglobulin product. Its safety is ensured by pathogen-elimination steps comprising solvent/detergent treatment and a nanofiltration process. This multicenter clinical study was designed to evaluate the efficacy and safety of combined aspirin and high-dose IVIG-SN therapy in pediatric patients with Kawasaki disease (KD). SUBJECTS AND METHODS We evaluated coronary artery lesions (CALs) at 2 and 7 weeks after administering IVIG-SN; total fever duration; and variations in erythrocyte sedimentation rate, N-terminal pro B-type natriuretic peptide or B-type natriuretic peptide, and creatine kinase-myocardial band level before and after treatment with IVIG-SN (2 g/kg). Adverse events were monitored. RESULTS Forty-five patients were enrolled, three of whom were excluded according to the exclusion criteria; the other 42 completed the study. The male:female ratio was 0.91:1, and the mean age was 29.11±17.23 months. The mean fever duration before IVIG-SN treatment was 6.45±1.30 days. Although most patients had complete KD (40 patients, 90.91%), four had atypical KD (9.09%). After IVIG-SN treatment, one patient (2.38%) had CALs, which was significantly lower than the incidence reported previously (15%) (p=0.022), but not significantly different from recent data (5%). There were no serious adverse events, though 28 patients (63.64%) had mild adverse events. Three adverse drug reactions occurred in 2 patients (eczema, anemia, and increased eosinophil count), all of which were transient. CONCLUSION IVIG-SN treatment in patients with KD was safe and effective.
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Affiliation(s)
- Kyung Lim Yoon
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea
| | - Hae Yong Lee
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea
| | - Jeong Jin Yu
- Division of Pediatric Cardiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jae Young Lee
- Division of Cardiology, Department of Pediatrics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics, Kyung Hee University Hospital, Seoul, Korea
| | | | - June Huh
- Division of Cardiology, Department of Pediatrics, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
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Park HR, Han MY, Yoon KL, Cha SH, Moon SK, Jung HW. Mycoplasma Infection as a cause of Persistent Fever after Intravenous Immunoglobulin Treatment of Patients with Kawasaki Disease: Frequency and Clinical Impact. Infect Chemother 2017; 49:38-43. [PMID: 28271651 PMCID: PMC5382048 DOI: 10.3947/ic.2017.49.1.38] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 10/20/2016] [Indexed: 11/25/2022] Open
Abstract
Background Mycoplasma is a common cause of respiratory infections and may require differential diagnosis from Kawasaki disease (KD). In this study, we investigated the frequency and clinical manifestations of mycoplasma infection in patients with KD. Materials and Methods Medical records of 375 in-patients admitted for treatment during the acute stage of KD, were collected, and reviewed retrospectively. Of these patients, 152 (40.5%) were also tested for recent mycoplasma infection. Patients with positive results (anti-mycoplasma IgM Ab >1:640 or cold agglutinin >1:64) were designated as the case group (n = 37, 24.3%) whereas those with negative results were designated as the control group (n = 115, 75.7%). Clinical findings of the two groups were compared. Results Patients in the case group were older than those in the control group (mean age, 48.2 ± 32.1 months, vs. 31.7 ± 21.7 months; P = 0.001). There were significant differences between the case and control groups in the changes in the extremities (78.3% vs. 57.4%, respectively; P = 0.031), and in fever duration (6.5 ± 2.5 days vs. 5.4 ± 1.5 days; P = 0.047). Of the 37 patients with positive mycoplasma testing, 7 (18.9%) had persistent fever even after the symptoms and signs of systemic inflammation (acute phase of KD) had been resolved. These patients were positive for mycoplasma infection during further evaluation of persistent fever, and all of them responded to macrolide antibiotics. Conclusions We found that mycoplasma infection is somewhat related to KD. When fever persists after resolution of the acute stage of KD, mycoplasma infection may be considered as a possible cause of fever in preschool-aged children.
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Affiliation(s)
- Hye Rim Park
- Department of Pediatrics, Kyung Hee University Hospital, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics, Kyung Hee University School of Medicine, Seoul, Korea.
| | - Kyung Lim Yoon
- Department of Pediatrics, Kyung Hee University School of Medicine, Seoul, Korea
| | - Sung Ho Cha
- Department of Pediatrics, Kyung Hee University Hospital, Seoul, Korea
| | - Sung Kyoung Moon
- Department of Diagnostic Radiology, Kyung Hee University School of Medicine, Seoul, Korea
| | - Hae Woon Jung
- Department of Pediatrics, Kyung Hee University Hospital, Seoul, Korea
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Lee HR, Yoo N, Kim JH, Sohn KY, Kim HJ, Kim MH, Han MY, Yoon SY, Kim JW. The Therapeutic Effect of PLAG against Oral Mucositis in Hamster and Mouse Model. Front Oncol 2016; 6:209. [PMID: 27800302 PMCID: PMC5065982 DOI: 10.3389/fonc.2016.00209] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 09/14/2016] [Indexed: 11/13/2022] Open
Abstract
Chemotherapy-induced mucositis can limit the effectiveness of cancer therapy and increase the risk of infections. However, no specific therapy for protection against mucositis is currently available. In this study, we investigated the therapeutic effect of PLAG (1-palmitoyl-2-linoleoyl-3-acetyl-rac-glycerol, acetylated diglyceride) in 5-fluorouracil (5-FU)-induced oral mucositis animal models. Hamsters were administered 5-FU (80 mg/kg) intraperitoneally on days 0, 6, and 9. The animals' cheek pouches were then scratched equally with the tip of an 18-gage needle on days 1, 2, and 7. PLAG was administered daily at 250 mg/kg/day. PLAG administration significantly reduced 5-FU/scratching-induced mucositis. Dramatic reversal of weight loss in PLAG-treated hamsters with mucositis was observed. Histochemical staining data also revealed newly differentiated epidermis and blood vessels in the cheek pouches of PLAG-treated hamsters, indicative of recovery. Whole blood analyses indicated that PLAG prevents 5-FU-induced excessive neutrophil transmigration to the infection site and eventually stabilizes the number of circulating neutrophils. In a mouse mucositis model, mice with 5-FU-induced disease treated with PLAG exhibited resistance to body-weight loss compared with mice that received 5-FU or 5-FU/scratching alone. PLAG also dramatically reversed mucositis-associated weight loss and inhibited mucositis-induced inflammatory responses in the tongue and serum. These data suggest that PLAG enhances recovery from 5-FU-induced oral mucositis and may therefore be a useful therapeutic agent for treating side effects of chemotherapy, such as mucositis and cachexia.
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Affiliation(s)
- Ha-Reum Lee
- Cell Factory Research Center, Division of Systems Biology and Bioengineering, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea; ENZYCHEM Lifesciences, Daejeon, South Korea
| | - Nina Yoo
- ENZYCHEM Lifesciences , Daejeon , South Korea
| | - Joo Heon Kim
- Department of Pathology, Eulji University School of Medicine , Daejeon , South Korea
| | | | | | - Myung-Hwan Kim
- Division of Gastroenterology, Department of Internal Medicine, University of Ulsan College of Medicine, Asan Medical Center , Seoul , South Korea
| | - Mi Young Han
- Ju-Sikyung Liveral Arts College, Pai Chai University , Daejeon , South Korea
| | | | - Jae Wha Kim
- Cell Factory Research Center, Division of Systems Biology and Bioengineering, Korea Research Institute of Bioscience and Biotechnology, Daejeon, South Korea; Department of Functional Genomics, University of Science and Technology, Daejeon, South Korea
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15
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Chun JH, Kim TH, Han MY, Kim NY, Yoon KL. Analysis of clinical characteristics and causes of chest pain in children and adolescents. Korean J Pediatr 2015; 58:440-5. [PMID: 26692880 PMCID: PMC4675925 DOI: 10.3345/kjp.2015.58.11.440] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2014] [Revised: 11/07/2014] [Accepted: 11/16/2014] [Indexed: 11/27/2022]
Abstract
PURPOSE Chest pain is common in children and adolescents and is a reason for referral to pediatric cardiologists. Although most cases of chest pain in these age groups are benign and do not require treatment, timely diagnosis is important not to miss life-threatening diseases requiring prompt treatment. We investigated certain clinical characteristics that may be useful in the diagnosis of such critical diseases. METHODS Patient medical records between July 2006 and September 2013 were retrospectively examined. We included 517 patients who presented with chest pain to the Department of Pediatrics at Kyung Hee University Hospital in Gangdong. RESULTS Most cases of chest pain were idiopathic in origin (73.6%), followed by cases with respiratory (9.3%), musculoskeletal (8.8%), cardiac (3.8%), gastrointestinal (2.9%), and psychiatric (1.4%) causes. In 6 patients (1.2%) with air-leak syndrome including pneumothorax or pneumomediastinum, the pain was abrupt, continuous, and lasted for a short period of 1-2 days after onset in the older adolescents. Of the patients with cardiac pain, 13 had cardiac arrhythmias (65.0%), 6 had congenital heart diseases (30%), and 1 had coronary aneurysms caused by Kawasaki disease (5.0%). One patient with atrial flutter had only symptoms of syncope and chest pain. CONCLUSION The abrupt, continuous chest pain of a short duration in the older children was characteristic of air-leak syndrome. In patients with pneumomediastinum, radiological diagnosis was difficult without careful examination. Combined syncope should not be neglected and further cardiac workup is essential in such patients.
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Affiliation(s)
- Ji Hye Chun
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea
| | - Tae Hyeong Kim
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics, Kyung Hee University Medical Center, Seoul, Korea
| | - Na Yeon Kim
- Department of Psychology, Chung Ang University, Seoul, Korea
| | - Kyung Lim Yoon
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea
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16
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Abstract
We report remarkable photovoltaic effect in YBa2Cu3O6.96 (YBCO) ceramic between 50 and 300 K induced by blue-laser illumination, which is directly related to the superconductivity of YBCO and the YBCO-metallic electrode interface. There is a polarity reversal for the open circuit voltage Voc and short circuit current Isc when YBCO undergoes a transition from superconducting to resistive state. We show that there exists an electrical potential across the superconductor-normal metal interface, which provides the separation force for the photo-induced electron-hole pairs. This interface potential directs from YBCO to the metal electrode when YBCO is superconducting and switches to the opposite direction when YBCO becomes nonsuperconducting. The origin of the potential may be readily associated with the proximity effect at metal-superconductor interface when YBCO is superconducting and its value is estimated to be ~10–8 mV at 50 K with a laser intensity of 502 mW/cm2. Combination of a p-type material YBCO at normal state with an n-type material Ag-paste forms a quasi-pn junction which is responsible for the photovoltaic behavior of YBCO ceramics at high temperatures. Our findings may pave the way to new applications of photon-electronic devices and shed further light on the proximity effect at the superconductor-metal interface.
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Affiliation(s)
- F Yang
- 1] College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, P. R. China [2] Henan Key Laboratory of Photovoltaic Materials, Xinxiang 453007, P. R. China
| | - M Y Han
- 1] College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, P. R. China [2] Henan Key Laboratory of Photovoltaic Materials, Xinxiang 453007, P. R. China
| | - F G Chang
- 1] College of Physics and Electronic Engineering, Henan Normal University, Xinxiang 453007, P. R. China [2] Henan Key Laboratory of Photovoltaic Materials, Xinxiang 453007, P. R. China
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Kim YJ, Park TS, Han MY, Yoon HS, Choi YS. A Korean case of de novo 18q deletion syndrome with a large atrial septal defect and cyanosis. Ann Lab Med 2015; 35:272-4. [PMID: 25729737 PMCID: PMC4330185 DOI: 10.3343/alm.2015.35.2.272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 09/02/2014] [Accepted: 12/02/2014] [Indexed: 01/09/2023] Open
Affiliation(s)
- Young Jin Kim
- Department of Laboratory Medicine, School of Medicine, Kyung Hee University, Seoul, Korea
| | - Tae Sung Park
- Department of Laboratory Medicine, School of Medicine, Kyung Hee University, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics, School of Medicine, Kyung Hee University, Seoul, Korea
| | - Hoi Soo Yoon
- Department of Pediatrics, School of Medicine, Kyung Hee University, Seoul, Korea
| | - Yong-Sung Choi
- Department of Pediatrics, School of Medicine, Kyung Hee University, Seoul, Korea
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18
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Kim SY, Han MY, Cha SH, Jeon YB. N-terminal pro-brain natriuretic peptide (NT proBNP) as a predictive indicator of initial intravenous immunoglobulin treatment failure in children with Kawasaki disease: a retrospective study. Pediatr Cardiol 2014; 34:1837-43. [PMID: 23744100 DOI: 10.1007/s00246-013-0724-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 05/20/2013] [Indexed: 10/26/2022]
Abstract
Intravenous immunoglobulin (IVIG) administered in the acute stage of Kawasaki disease (KD) is the standard therapy. Few reports describe nonresponders to initial treatment with IVIG in KD, which remains the most consistent risk factor for coronary artery lesions (CALs). This study aimed to investigate whether the serum level of N-terminal pro-brain natriuretic peptide (NT-proBNP) can be a predictive indicator for identifying patients with KD at higher risk of IVIG treatment failure. In this study, 135 patients with a diagnosis of KD admitted for IVIG treatment were retrospectively enrolled for analysis. Of these 135 patients, 22 were nonresponders who received additional rescue therapy because they had an elevated body temperature 36 h after completion of initial IVIG treatment. The NT-proBNP concentration was significantly higher in the nonresponder group (2,465.36 ± 3,293.24 pg/mL) than in the responder group (942.38 ± 1,293.48 pg/mL) (p < 0.05). The optimal sensitivity and specificity cutoff point for predicted nonresponders was 1,093.00 pg/mL or higher. The sensitivity and specificity for prediction of IVIG response were respectively 70.0 and 76.5 %. The findings show that NT-proBNP is a helpful marker in determining patients at risk for not responding to initial IVIG treatment. The authors suggest that patients with an NT-proBNP level of 1,093.00 pg/dL or higher are likely to fail initial IVIG and may require further rescue therapy.
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Affiliation(s)
- So Youn Kim
- Department of Pediatrics, Kyunghee University School of Medicine, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul, 130-701, South Korea
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Amin MT, Kim TI, Amin MN, Han MY. Effects of catchment, first-flush, storage conditions, and time on microbial quality in rainwater harvesting systems. Water Environ Res 2013; 85:2317-2329. [PMID: 24597047 DOI: 10.2175/106143013x13706200598433] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Rainwater collected from a rooftop rainwater harvesting (RWH) system is typically not considered suitable for potable uses, primarily because of poor microbial quality. The quality of stored rainwater, however, can be improved through basic design and maintenance practices during the construction and operation of an RWH system. This paper presents the microbial analysis of rainwater in two RWH systems installed at the Seoul National University Campus in South Korea. Rainwater samples were collected at different locations within each system and analyzed for total and fecal coliforms, Escherichia coli, and heterotrophic plate count bacteria. Within their storage tanks, water quality improved horizontally from inlet to outlet points, and higher quality was observed at the supply point (located about 0.5 m from the base of the tank) than at the surface or bottom of the tank. First-flush rainwater was found to be highly contaminated but rainwater quality improved following about 1 mm of precipitation. The catchment surface also had a significant effect on the quality of rainwater; samples collected from a rooftop exhibited better microbial quality than from a terrace catchment. Better water quality in underground tanks (dark storage conditions) compared to open weirs/ filters (exposed to natural light) demonstrated the importance of storage conditions. Water quality also improved with longer storage, and a decrease of 70% to 90% in microbial concentrations was observed after about 1 week of storage time. The findings of this study demonstrate that the microbial quality of harvested rainwater can be improved significantly by the adoption of proper design and maintenance guidelines such as those discussed in this paper.
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Affiliation(s)
- M T Amin
- Alamoudi Water Chair, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia
| | - Tschung-il Kim
- Civil and Environmental Engineering Department, Seoul National University, South Korea
| | - M N Amin
- Department of Civil and Environmental Engineering, College of Engineering, King Faisal University, Al-Hofuf, Al-Ahsa 31982, Kingdom of Saudi Arabia
| | - M Y Han
- Civil and Environmental Engineering Department, Seoul National University, South Korea
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20
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Lee JY, Moon HJ, Kim TI, Kim HW, Han MY. Quantitative analysis on the urban flood mitigation effect by the extensive green roof system. Environ Pollut 2013; 181:257-261. [PMID: 23892044 DOI: 10.1016/j.envpol.2013.06.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [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: 04/02/2013] [Revised: 06/25/2013] [Accepted: 06/27/2013] [Indexed: 06/02/2023]
Abstract
Extensive green-roof systems are expected to have a synergetic effect in mitigating urban runoff, decreasing temperature and supplying water to a building. Mitigation of runoff through rainwater retention requires the effective design of a green-roof catchment. This study identified how to improve building runoff mitigation through quantitative analysis of an extensive green-roof system. Quantitative analysis of green-roof runoff characteristics indicated that the extensive green roof has a high water-retaining capacity response to rainfall of less than 20 mm/h. As the rainfall intensity increased, the water-retaining capacity decreased. The catchment efficiency of an extensive green roof ranged from 0.44 to 0.52, indicating reduced runoff comparing with efficiency of 0.9 for a concrete roof. Therefore, extensive green roofs are an effective storm water best-management practice and the proposed parameters can be applied to an algorithm for rainwater-harvesting tank design.
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Affiliation(s)
- J Y Lee
- KIST (Korea Institute of Science and Technology), Gangneung Institute, Gangnueng 210-340, South Korea.
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21
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Han MY, Dai JJ, Zhang Y, Lin Q, Jiang M, Xu XY, Liu Q. Identification of osteoarthritis biomarkers by proteomic analysis of synovial fluid. J Int Med Res 2013; 40:2243-50. [PMID: 23321181 DOI: 10.1177/030006051204000622] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
OBJECTIVE To use proteomic analysis to identify novel candidate biomarker proteins in synovial fluid for the differential diagnosis of osteoarthritis and rheumatoid arthritis. METHODS Synovial fluid samples were analysed using surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF-MS). Data were used to generate an artificial neural network (ANN). The identification of one protein peak was confirmed via Western blotting. RESULTS Fluid samples were analysed from 36 patients with osteoarthritis and 24 with rheumatoid arthritis. In total, three protein peaks (mass-to-charge ratio [m/z] 3893, 10,576 and 14,175 Da) were identified as potential biomarkers for osteoarthritis. The ANN differentiated between osteoarthritis and rheumatoid arthritis with a sensitivity of 89.4% and a specificity of 91.2%. The protein peak at m/z 10 576 was identified as S100 calcium binding protein A12 (S100A12). CONCLUSIONS A combination of SELDI-TOF-MS and ANN identified osteoarthritis biomarkers. SELDI-TOF-MS may be a useful tool in the screening of synovial fluid for osteoarthritis diagnosis.
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Affiliation(s)
- M Y Han
- Cancer Therapy and Research Centre, Shandong Provincial Hospital, Shandong University, Jinan Province, China
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22
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Nawaz M, Han MY, Kim TI, Manzoor U, Amin MT. Silver disinfection of Pseudomonas aeruginosa and E. coli in rooftop harvested rainwater for potable purposes. Sci Total Environ 2012; 431:20-25. [PMID: 22664534 DOI: 10.1016/j.scitotenv.2012.05.022] [Citation(s) in RCA: 21] [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] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Revised: 04/30/2012] [Accepted: 05/07/2012] [Indexed: 06/01/2023]
Abstract
Rainwater harvesting being an alternate source in water scarce areas is becoming a common practice. Catchment contact, however, deteriorates the quality of rainwater making it unfit for potable purposes. To improve the quality of harvested rainwater, silver was used as antimicrobial agent in this study. Rainwater samples were taken from underground storage tank of a rooftop rainwater harvesting system installed in one of the buildings at Seoul National University, Seoul, South Korea. The target microorganisms (MOs) were Pseudomonas aeruginosa and Escherichia coli which were measured by using plate count method and standard MPN method, respectively. The efficiency of silver disinfection was evaluated at concentrations, ranging from 0.01 to 0.1 mg/l; the safe limit approved by WHO. The experiments were performed for 168 h with different time intervals to evaluate the parameters including inactivation rate, residual effect of silver and re-growth in both MOs at lower (i.e. 0.01-0.04 mg/l) as well as the higher concentrations of silver (i.e. 0.08-0.1 mg/l). Results showed the re-growth in both MOs was only in the case of lower concentrations of silver. The possible reason of re-growth at these concentrations of silver may be the halting of bacterial cell replication process for some time without permanent damage. The kinetics of this study suggest that higher inactivation and long term residual effect towards both MOs can be achieved with the application of silver at 0.08 mg/l or higher under safe limit.
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Affiliation(s)
- M Nawaz
- Alamoudi Water Chair, King Saud University, P.O. Box 2460, Riyadh, 11451, Saudi Arabia
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23
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Choi YM, Shim KS, Yoon KL, Han MY, Cha SH, Kim SK, Jung JH. Transforming growth factor beta receptor II polymorphisms are associated with Kawasaki disease. Korean J Pediatr 2012; 55:18-23. [PMID: 22359526 PMCID: PMC3282214 DOI: 10.3345/kjp.2012.55.1.18] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 09/27/2011] [Accepted: 11/12/2011] [Indexed: 12/12/2022]
Abstract
Purpose Transforming growth factor beta receptor 2 (TGFBR2) is a tumor suppressor gene that plays a role in the differentiation of striated cells and remodeling of coronary arteries. Single nucleotide polymorphisms (SNPs) of this gene are associated with Marfan syndrome and sudden death in patients with coronary artery disease. Cardiovascular remodeling and T cell activation of TGFBR2 gene suggest that the TGFBR2 gene SNPs are related to the pathogenesis of Kawasaki disease (KD) and coronary artery lesion (CAL). Methods The subjects were 105 patients with KD and 500 healthy adults as controls. Mean age of KD group was 32 months age and 26.6% of those had CAL. We selected TGFBR2 gene SNPs from serum and performed direct sequencing. Results The sequences of the eleven SNPs in the TGFBR2 gene were compared between the KD group and controls. Three SNPs (rs1495592, rs6550004, rs795430) were associated with development of KD (P=0.019, P=0.026, P=0.016, respectively). One SNP (rs1495592) was associated with CAL in KD group (P=0.022). Conclusion Eleven SNPs in TGFBR2 gene were identified at that time the genome wide association. But, with the change of the data base, only six SNPs remained associated with the TGFBR2 gene. One of the six SNPs (rs6550004) was associated with development of KD. One SNP associated with CAL (rs1495592) was disassociated from the TGFBR2 gene. The other five SNPs were not functionally identified, but these SNPs are notable because the data base is changing. Further studies involving larger group of patients with KD are needed.
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Affiliation(s)
- Yu Mi Choi
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Seoul, Korea
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Mun JS, Han MY. Design and operational parameters of a rooftop rainwater harvesting system: definition, sensitivity and verification. J Environ Manage 2012; 93:147-153. [PMID: 22054581 DOI: 10.1016/j.jenvman.2011.08.024] [Citation(s) in RCA: 7] [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] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 08/01/2011] [Accepted: 08/17/2011] [Indexed: 05/31/2023]
Abstract
The appropriate design and evaluation of a rainwater harvesting (RWH) system is necessary to improve system performance and the stability of the water supply. The main design parameters (DPs) of an RWH system are rainfall, catchment area, collection efficiency, tank volume and water demand. Its operational parameters (OPs) include rainwater use efficiency (RUE), water saving efficiency (WSE) and cycle number (CN). The sensitivity analysis of a rooftop RWH system's DPs to its OPs reveals that the ratio of tank volume to catchment area (V/A) for an RWH system in Seoul, South Korea is recommended between 0.03 and 0.08 in terms of rate of change in RUE. The appropriate design value of V/A is varied with D/A. The extra tank volume up to V/A of 0.15∼0.2 is also available, if necessary to secure more water. Accordingly, we should figure out suitable value or range of DPs based on the sensitivity analysis to optimize design of an RWH system or improve operation efficiency. The operational data employed in this study, which was carried out to validate the design and evaluation method of an RWH system, were obtained from the system in use at a dormitory complex at Seoul National University (SNU) in Korea. The results of these operational data are in good agreement with those used in the initial simulation. The proposed method and the results of this research will be useful in evaluating and comparing the performance of RWH systems. It is found that RUE can be increased by expanding the variety of rainwater uses, particularly in the high rainfall season.
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Affiliation(s)
- J S Mun
- Rainwater Research Center, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151-742, Republic of Korea.
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Yoon KL, Ko JH, Shim KS, Han MY, Cha SH, Kim SK, Jung JH. Polymorphisms of methylenetetrahydrofolate reductase are not a risk factor for Kawasaki disease in the Korean population. Korean J Pediatr 2011; 54:335-9. [PMID: 22087200 PMCID: PMC3212703 DOI: 10.3345/kjp.2011.54.8.335] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Revised: 05/22/2011] [Accepted: 07/21/2011] [Indexed: 11/27/2022]
Abstract
PURPOSE Hyperhomocysteinemia is known as a risk factor for atherosclerosis. Preclinical arteriosclerosis is noted and premature atherosclerosis is known to be accelerated in Kawasaki disease (KD) patients. Genetic polymorphisms in the 5,10-methylenetetrahydrofolate reductase (MTHFR) gene result in elevated plasma homocysteine concentrations and are known to be associated with the development of coronary artery disease. Our hypothesis is that single nucleotide polymorphisms (SNPs) of the MTHFR gene are related to the development of KD and coronary artery lesions (CALs). METHODS For this study, we selected 3 candidate single nucleotide polymorphisms (SNPs) (rs2274976, rs1801131, and rs1801133) of MTHFR. These SNPs are located on chromosome 1p36.3. We included 101 KD patients and 306 healthy adults as controls in this study. CALs were seen in 38 patients. Genotypes of the selected SNPs were determined by direct sequencing and analyzed with SNPAlyze. RESULTS The genetic distribution and allelic frequency of the 3 MTHFR SNPs (rs2274976, rs1801131, and rs1801133) were not significantly different in patients with KD compared to the control group (P=0.71, 0.17, and 0.96, respectively). There was no difference in the genetic distribution of the MTHFR SNPs between the normal control group and the CAL group (P=0.43, 0.39, 0.52 respectively). CONCLUSION The genetic distribution of the MTHFR SNPs (rs2274976, rs1801131, and rs1801133) was not different in the KD group compared to the control group. In addition, the genetic distribution of these SNPs was not different in the CAL group compared to the control group in the Korean population.
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Affiliation(s)
- Kyung Lim Yoon
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea
| | - Jin Hee Ko
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea
| | - Kye Shik Shim
- Department of Pediatrics, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics, Kyung-Hee University Medical Center, Kyung Hee University School of Medicine, Seoul, Korea
| | - Sung Ho Cha
- Department of Pediatrics, Kyung-Hee University Medical Center, Kyung Hee University School of Medicine, Seoul, Korea
| | - Su Kang Kim
- Department of Clinical Pharmacology, Kyung Hee University School of Medicine, Seoul, Korea
| | - Joo Ho Jung
- Department of Clinical Pharmacology, Kyung Hee University School of Medicine, Seoul, Korea
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Han MY, Mun JS. Operational data of the Star City rainwater harvesting system and its role as a climate change adaptation and a social influence. Water Sci Technol 2011; 63:2796-2801. [PMID: 22049701 DOI: 10.2166/wst.2011.597] [Citation(s) in RCA: 7] [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: 05/31/2023]
Abstract
The Star City rainwater harvesting system (RWHS) was featured in the December, 2008, issue of Water 21. The article highlighted that the RWHS has a 3,000 m3 rainwater tank used in water saving, flood mitigation, and emergency response. Since then, many news media, public officials, and people from both South Korea and abroad have visited the RWHS. In this paper, two years of the system's operational data are presented and its role in short- and long-term climate change adaptation is investigated. The downstream sewer system has become safe for a 50-year rainfall without upgrading the existing sewer system, which was designed for a 10-year period. The 26,000 m3 of water saved has reduced the energy requirement of transferring water from a distant area. The success of the Star City RWHS has influenced 47 cities across South Korea, including Seoul, to enact regulations on rainwater management. It has shown that decentralized rainwater management can supplement the existing centralized system to ensure its safety.
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Affiliation(s)
- M Y Han
- Department of Civil and Environmental Engineering, Seoul National University, 599 Gwanangno, Gwanak-gu, Seoul 151-742, Republic of Korea
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27
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Abstract
A major obstacle to the promotion of rainwater harvesting is chemical and microbiological concerns. To determine its suitability as an alternative water resource, water quality parameters such as pH, turbidity and metal ion concentrations and counted total coliform, Escherichia coli and heterotrophic bacteria were measured. It was observed that the stored rainwater had a neutral average pH and that its turbidity depended on the duration and intensity of the rainfall event. Metal concentrations were within the permissible limits specified in the Korea drinking water standard. In addition, counts of coliform, E. coli and heterotrophic bacteria were higher in the first flush 5 min after the start of the rainfall event. Principal component analysis and correlation analysis through 40 events in 2009 showed that the quality of stored rainwater depends on the conditions of the catchment and storage tank and the antecedent dry period.
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Affiliation(s)
- J Y Lee
- Natural Products Center, KIST (Korea Institute of Science and Technology), Gangneung Institute, Gangnueng 210-340, South Korea
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28
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Cho SY, Kim Y, Cha SH, Suh JT, Han MY, Lee HJ. Adjuvant laboratory marker of Kawasaki disease; NT-pro-BNP or hs-CRP? Ann Clin Lab Sci 2011; 41:360-363. [PMID: 22166506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
BACKGROUND The diagnosis of Kawasaki disease (KD) is based on clinical data and non-pathognomonic symptoms. As no specific diagnostic test for KD exists, BNP or NT-pro-BNP might be of importance in identifying KD. We compared serum hs-CRP and NT-pro-BNP level in the acute phase of 59 KD patients and evaluated the diagnostic performance of these laboratory markers in KD to estimate the cut-off level for differentiating KD from other febrile illnesses as age-matched controls. MATERIALS AND METHODS The study groups consisted of 59 KD patients in the disease group and 45 other patients with febrile illnesses as age-matched controls. NT-pro-BNP was measured using Elecsys proBNP (Roche Diagnostics, Mannheim, Germany), and hs-CRP was tested with CardioPhase hs-CRP (Siemens Healthcare Diagnostics, Marburg, Germany). RESULTS NT-pro-BNP levels were significantly higher in the KD patients than in the controls (P < 0.001). In the ROC curve analysis, the sensitivity was 66.10%, and the specificity was 77.08% at 235.2 pg/mL. hs-CRP levels tended to be higher in KD patients compared to controls. DISCUSSION This study indicates that NT-pro-BNP might be a more useful laboratory marker as an adjuvant diagnostic tool for KD than hs-CRP. Especially in a patient with incomplete clinical features of KD, the diagnosis and the start of treatment were delayed to confirm a fever persisting for at least 5 days. Therefore, we expect that NT-pro- BNP would be especially useful for KD patients with these atypical clinical presentations.
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Affiliation(s)
- Sun Young Cho
- Department of Laboratory Medicine, School of Medicine, Kyung Hee University,1 Hoegidong, Dongdaemun-gu, Seoul 130-702, Korea
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Abstract
In order to evaluate the potential of rainwater harvesting (RWH) for mitigating water scarcity in a semi-arid zone of the country (Mashhad-Iran), three typical RWH systems were installed and monitored. The first system consists of 5,000 m² natural ground catchment which was leveled and covered with plastic sheets allowing for maximum possible runoff generation. Surface runoff was conducted into a 500 m³ ground reservoir via a series of draining ditches and an end collection channel. The water collected from a plastic covered catchment was used for irrigation of dryland wheat cultivation. According to the result of two years measurements, grain yield was almost doubled in irrigated plots when compared to conventional rainfed cultivation. In the second RWH system, runoff generated from about 2 ha asphaltic road and parking was diverted into a 1,200 m³ ground reservoir. The results of 2 years measurement for reservoir inflow and outflow indicated that runoff generated during rainy season was sufficient to produce necessary water for irrigating 900 planted fruit trees during successive dry seasons. The last experiment reported here is about a 40 m² roof area which was connected to a plastic tank for runoff measurement. The conclusion was that the proposed RWH system can produce enough water for building's toilets' flashes and other sanitary purposes so that the potable water could be saved considerably. In general, the results of three rainwater harvesting experiments showed the importance of using rainwater for compensating the effect of water shortages which is repeatedly occurring due to the effect of current climate change and ever increasing water utilization for drinking and food production.
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Affiliation(s)
- J Tabatabaee
- Khorasan Agriculture and Natural Resource Research Center, Iran.
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Abstract
Recent research and monitoring undertaken by various institutions have emphasized measurements of river-water quality. Based on the results, government agencies have set guidelines to improve river-water quality management. However, the relationship between water quality and land use/land cover (LULC) has not been examined closely in South Korea to date. This study investigated this relationship in the Imgok River watershed. For this study, the relationship between water quality parameters, e.g. metallic ions, biological oxygen demand and chemical oxygen demand (BOD and COD), NH₃, NO₃ and PO₄ levels and land-use types (abandoned mine land, forest/grassland, agricultural, livestock and residential areas) was examined by correlation analysis with significant level (p<0.05) and principal component analysis (PCA). Applying PCA to water quality parameters according to land-use coverage, the principal component impacting river water quality were found to be the pH, metallic ions, BOD, PO₄, COD and total suspended solids (TSS) for abandoned mine land (AML) coverage; BOD, NO₃ and PO₄ for forest/grassland areas; TSS, NO₃, and PO₄ for agricultural land; BOD, COD, NH₃ and NO₃ for livestock coverage; and BOD, COD, NH₃ and PO₄ for residential areas. For the AML, the pH exhibited a significant negative correlation with other water quality parameters at the significant level (p<0.05). Grassland showed significant positive correlations of BOD with values of 0.837 NO₃ and 0.514 PO₄. In agricultural land, TSS had a significant negative correlation with value of -0.772 PO₄. For livestock coverage, BOD had significant positive correlations with values of 0.865 COD, 0.629 NH₃, 0.709 NO₃ and 0.472 TSS. In residential areas, COD was significantly positively correlated with values of 0.988 BOD and 0.856 PO₄, and TSS was highly positively correlated with value of 0.810 NO₃ but highly negatively correlated with value of -0.702 PO₄. Based on the above, LULC is a significant factor to influence on river water quality and this relationship should be based on the management plan for river water quality control. Future work will be conducted to take more samples in the entire river and season, to run water quality model and to choose a new method for better analysis and more accurate relationship between land-use and water quality.
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Affiliation(s)
- J Y Lee
- Natural Products Center, KIST (Korea Institute of Science and Technology)-Gangneung Institute, Gangnueng 210-340, South Korea.
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Amin MT, Han MY. Roof-harvested rainwater for potable purposes: application of solar collector disinfection (SOCO-DIS). Water Res 2009; 43:5225-5235. [PMID: 19783275 DOI: 10.1016/j.watres.2009.08.041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2009] [Revised: 08/20/2009] [Accepted: 08/24/2009] [Indexed: 05/28/2023]
Abstract
The efficiency of solar disinfection (SODIS), recommended by the World Health Organization, has been determined for rainwater disinfection, and potential benefits and limitations discussed. The limitations of SODIS have now been overcome by the use of solar collector disinfection (SOCO-DIS), for potential use of rainwater as a small-scale potable water supply, especially in developing countries. Rainwater samples collected from the underground storage tanks of a rooftop rainwater harvesting (RWH) system were exposed to different conditions of sunlight radiation in 2-L polyethylene terephthalate bottles in a solar collector with rectangular base and reflective open wings. Total and fecal coliforms were used, together with Escherichia coli and heterotrophic plate counts, as basic microbial and indicator organisms of water quality for disinfection efficiency evaluation. In the SOCO-DIS system, disinfection improved by 20-30% compared with the SODIS system, and rainwater was fully disinfected even under moderate weather conditions, due to the effects of concentrated sunlight radiation and the synergistic effects of thermal and optical inactivation. The SOCO-DIS system was optimized based on the collector configuration and the reflective base: an inclined position led to an increased disinfection efficiency of 10-15%. Microbial inactivation increased by 10-20% simply by reducing the initial pH value of the rainwater to 5. High turbidities also affected the SOCO-DIS system; the disinfection efficiency decreased by 10-15%, which indicated that rainwater needed to be filtered before treatment. The problem of microbial regrowth was significantly reduced in the SOCO-DIS system compared with the SODIS system because of residual sunlight effects. Only total coliform regrowth was detected at higher turbidities. The SOCO-DIS system was ineffective only under poor weather conditions, when longer exposure times or other practical means of reducing the pH were required for the treatment of stored rainwater for potable purposes.
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Affiliation(s)
- M T Amin
- Department of Environmental Sciences, COMSATS Institute of Information Technology, Abbottabad, 22060, Pakistan.
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Lee HJ, Lee MS, Kim JS, Kim ER, Kang SW, Kim SK, Chung JH, Yoon KL, Han MY, Cha SH. The relationship between catechol-O-methyltransferase gene polymorphism and coronary artery abnormality in Kawasaki disease. Korean J Pediatr 2009. [DOI: 10.3345/kjp.2009.52.1.87] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Hyo Jin Lee
- Department of Pediatrics, Sung-Ae General Hospital, Seoul, Korea
| | - Myung Sook Lee
- Department of Pediatrics, Sung-Ae General Hospital, Seoul, Korea
| | - Ji Sook Kim
- Department of Pediatrics, Sung-Ae General Hospital, Seoul, Korea
| | - Eun Ryoung Kim
- Department of Pediatrics, Sung-Ae General Hospital, Seoul, Korea
| | - Sung Wook Kang
- Kohwang Medical Research Institute, School of Medicine, Kyunghee University, Seoul, Korea
| | - Soo Kang Kim
- Kohwang Medical Research Institute, School of Medicine, Kyunghee University, Seoul, Korea
| | - Joo Ho Chung
- Kohwang Medical Research Institute, School of Medicine, Kyunghee University, Seoul, Korea
| | - Kyung Lim Yoon
- Department of Pediatrics, East-West Neo-medical Center, Kyunghee University, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics, College of Medicine, Kyunghee University, Seoul, Korea
| | - Seong Ho Cha
- Department of Pediatrics, College of Medicine, Kyunghee University, Seoul, Korea
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Jung KH, Choi HS, Kim DH, Han MY, Chang UJ, Yim SV, Song BC, Kim CH, Kang SA. Epigallocatechin Gallate Stimulates Glucose Uptake Through the Phosphatidylinositol 3-Kinase-Mediated Pathway in L6 Rat Skeletal Muscle Cells. J Med Food 2008; 11:429-34. [DOI: 10.1089/jmf.2007.0107] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Affiliation(s)
- Kyung Hee Jung
- Department of Clinical Pharmacology, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
- Department of Kowang Medical Research Institute, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Han Sung Choi
- Department of Emergency Medicine, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Dong Hwan Kim
- Department of Kowang Medical Research Institute, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Mi Young Han
- Department of Kowang Medical Research Institute, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Un Jae Chang
- Department of Food and Nutrition, Dongduk Women's University, Seoul, Republic of Korea
| | - Sung-Vin Yim
- Department of Clinical Pharmacology, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
- Department of Kowang Medical Research Institute, College of Medicine, Kyung Hee University, Seoul, Republic of Korea
| | - Byeng Chun Song
- Department of Human Environmental Sciences, Konkuk University, Chungbuk, Seoul, Republic of Korea
| | - Chul-Ho Kim
- Biotechnology Research Division, Jeonbuk Branch Institute Molecular Bioprocess Research Center, Korea Research Institute of Bioscience and Biotechnology, Taejon, Seoul, Republic of Korea
| | - Soon Ah Kang
- Department of Fermented Food Science, Seoul University of Venture & Information, Seoul, Republic of Korea
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Jiang Z, Henriksen EA, Tung LC, Wang YJ, Schwartz ME, Han MY, Kim P, Stormer HL. Infrared spectroscopy of Landau levels of graphene. Phys Rev Lett 2007; 98:197403. [PMID: 17677660 DOI: 10.1103/physrevlett.98.197403] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2007] [Indexed: 05/16/2023]
Abstract
We report infrared studies of the Landau level (LL) transitions in single layer graphene. Our specimens are density tunable and show in situ half-integer quantum Hall plateaus. Infrared transmission is measured in magnetic fields up to B=18 T at selected LL fillings. Resonances between hole LLs and electron LLs, as well as resonances between hole and electron LLs, are resolved. Their transition energies are proportional to sqrt[B], and the deduced band velocity is (-)c approximately equal to 1.1 x 10(6) m/s. The lack of precise scaling between different LL transitions indicates considerable contributions of many-particle effects to the infrared transition energies.
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Affiliation(s)
- Z Jiang
- Department of Physics, Columbia University, New York, NY 10027, USA.
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Yoon MJ, Yoon HS, Chung SH, Han MY, Bae CW. The factors associated with the efficacy of indomethacin treatment in premature infants with patent ductus arteriosus. Korean J Pediatr 2007. [DOI: 10.3345/kjp.2007.50.6.531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Min Jeong Yoon
- Department of Pediatrics, College of Medicine, Kyunghee University, Korea
| | - Hye Sun Yoon
- Department of Pediatrics, College of Medicine, Eulji University, Korea
| | - Sung Hoon Chung
- Department of Pediatrics, College of Medicine, Kyunghee University, Korea
| | - Mi Young Han
- Department of Pediatrics, College of Medicine, Kyunghee University, Korea
| | - Chong Woo Bae
- Department of Pediatrics, Kyunghee University East-West Neo-medical Center, Korea
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Affiliation(s)
- Kyu Ha Lee
- Department of Pediatrics, Kyunghee University College of Medicine, Seoul, Korea
| | - Min Jung Yoon
- Department of Pediatrics, Kyunghee University College of Medicine, Seoul, Korea
| | - Mi Young Han
- Department of Pediatrics, Kyunghee University College of Medicine, Seoul, Korea
| | - Sa Jun Chung
- Department of Pediatrics, Kyunghee University College of Medicine, Seoul, Korea
| | - Soo Cheol Kim
- Department of Thoracic & Cardiovascular Surgery, Kyunghee University College of Medicine, Seoul, Korea
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Han MY. Polymorphism in the promoter region of the plasminogen activator inhibitor-1 (PAI-1) gene in Kawasaki disease. Korean J Pediatr 2007. [DOI: 10.3345/kjp.2007.50.6.570] [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] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Mi Young Han
- Department of Pediatrics, College of Medicine, Kyunghee University, Seoul, Korea
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38
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Abstract
Design of a rainwater storage tank is mostly based on the mass balance of rainwater with respect to the tank, considering aspects such as rainfall runoff, water usage and overflow. So far, however, little information is available on the quality aspects of the stored rainwater, such as the behavior of particles, the effect of retention time of the water in the tank and possible influences of system configuration on water quality in the storage tank. In this study, we showed that the performance of rainwater storage tanks could be maximized by recognizing the importance of water quality improvement by sedimentation and the importance of the system configuration within the tank, as well as the efficient collection of runoff. The efficiency of removal of the particles was increased by there being a considerable distance between the inlet and the outlet in the rainwater storage tank. Furthermore, it is recommended that the effective water depth in a rainwater tank be designed to be more than 3 m and that the rainwater be drawn from as close to the water surface as possible by using a floating suction device. An operation method that increases the retention time by stopping rainwater supply when the turbidity of rainwater runoff is high will ensure low turbidity in the rainwater collected from the tank.
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Affiliation(s)
- M Y Han
- School of Civil, Urban & Geosystems Engineering, Seoul National University, San 56-1, Shilim-dong, Gwanak-gu, Seoul, 151-742, Republic of Korea.
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Dockko S, Park SC, Kwon SB, Han MY. Application of the flotation process to thicken the sludge from a DAF plant. Water Sci Technol 2006; 53:159-65. [PMID: 16752777 DOI: 10.2166/wst.2006.220] [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: 05/10/2023]
Abstract
Dissolved air flotation (DAF) was evaluated for thickening of the sludges from a water treatment plant which uses DAF. Solid flux theory for gravity thickening was applied to the solid flux of DAF sludge. The higher the polymer dosage, at fixed solid concentration, the greater the rising velocity becomes. When applied with solid flux equations, a similar relationship to that of gravity thickening has been found. However, the values were much higher than in gravity thickening, because both the inflow solid concentration and the floating velocity were higher than for settled sludge. With this result, the proper dosage of polymer could be derived from the relationship between total solid flux and withdrawal velocity of DAF sludge.
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Affiliation(s)
- S Dockko
- Dankook University, Dept of Civil and Environmental Eng, Chungnam, Korea.
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40
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Han MY, Kim MK, Ahn HJ. Effects of surface charge, micro-bubble size and particle size on removal efficiency of electro-flotation. Water Sci Technol 2006; 53:127-32. [PMID: 16752773 DOI: 10.2166/wst.2006.216] [Citation(s) in RCA: 10] [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] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Flotation is a water treatment alternative to sedimentation, and uses small bubbles to remove low-density particles from potable water and wastewater. The effect of zeta potential, bubble size and particle size on removal efficiency of the electro-flotation process was investigated because previous model-simulations indicated that these attributes are critical for high collision efficiency between micro-bubbles and particles. Solutions containing Al3+ as the metal ion were subjected to various conditions. The zeta potentials of bubbles and particles were similar under identical conditions, and their charges were influenced by metal ion concentration and pH. Maximum removal efficiency was 98 and 12% in the presence and absence of flocculation, respectively. Removal efficiency was higher when particle size was similar to bubble size. These results agree with modelling simulations and indicate that collision efficiency is greater when the zeta potential of one is negative and that of the other is positive and when their sizes are similar.
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Affiliation(s)
- M Y Han
- The School of Civil, Urban and Geosystems Engineering, Seoul National University, Korea.
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41
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Kim HK, Jeong MJ, Kong MY, Han MY, Son KH, Kim HM, Hong SH, Kwon BM. Inhibition of Shc/Grb2 protein-protein interaction suppresses growth of B104-1-1 tumors xenografted in nude mice. Life Sci 2005; 78:321-8. [PMID: 16146636 DOI: 10.1016/j.lfs.2005.04.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2005] [Accepted: 04/26/2005] [Indexed: 11/19/2022]
Abstract
Actinomycin D was revealed as an inhibitor of Shc/Grb2 interaction in cell lines from our recent study. Shc and Grb2 proteins are important molecules in Ras signaling pathways leading to cellular differentiation and proliferation, which require dramatic morphological changes. It was detected by transmission electron microscopy that actinomycin D induced significant changes in cellular ultrastructures of B104-1-1 cells and confirmed that the changes were due to inhibition of Shc/Grb2 interaction by actinomycin D rather than its inhibitory effect on transcription. Because actinomycin D was dispersed mainly in cytoplasm and Shc peptide (synthetic 13 amino acid tyrosine phosphorylated polypeptide) successfully displaced actinomycin D binding to its cellular targets while the other polypeptide from PDGF receptor could not. We examined the effect of actinomycin D on growth of B104-1-1 tumor xenografted in nude mice. Tumor growth was inhibited in vivo after treatment with this inhibitor. Efficacy was correlated with a reduction in the levels of Shc/Grb2 binding in excised tumors. These results suggest that actinomycin D inhibited Shc/Grb2 interaction in B104-1-1 tumor xenografted in nude mice.
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Affiliation(s)
- Hyae-Kyeong Kim
- Korea Research Institute of Bioscience and Biotechnology, 52 Uendong Yusung Taejon, 305-333, Republic of Korea
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Park JB, Lee CS, Lee HY, Kim IS, Lee BD, Jang IH, Jung YW, Oh YS, Han MY, Jensen ON, Roepstorff P, Suh PG, Ryu SH. Regulation of phospholipase D2 by GTP-dependent interaction with dynamin. ACTA ACUST UNITED AC 2005; 44:249-64. [PMID: 15581494 DOI: 10.1016/j.advenzreg.2003.11.021] [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] [Indexed: 11/28/2022]
Affiliation(s)
- Jong Bae Park
- Department of Life Science and Division of Molecular and Life Sciences, Pohang University of Science and Technology, San 31 Hyoja Dong, Pohang 790-784, South Korea
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Yoo J, Jeong MJ, Cho HJ, Oh ES, Han MY. Dynamin II interacts with syndecan-4, a regulator of focal adhesion and stress-fiber formation. Biochem Biophys Res Commun 2005; 328:424-31. [PMID: 15694365 DOI: 10.1016/j.bbrc.2004.12.179] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2004] [Indexed: 10/25/2022]
Abstract
Dynamin is a large mechanochemical GTPase that has been implicated in vesicle formation in multiple cellular compartments. It is believed that dynamin interacts with a variety of cellular proteins to constrict membranes. To identify potential intracellular proteins that interact with the PH domain of dynamin II, we carried out a yeast two-hybrid screen in which the PH domain of dynamin II was used as bait. The cell surface heparan sulfate proteoglycan syndecan-4 that acts in conjunction with integrins to promote the formation of actin stress fibers and focal adhesions was isolated as a binding partner for the PH domain of dynamin II. In vitro binding assays, immunoprecipitation, and confocal microscopy analysis confirmed the association of dynamin II with syndecan-4. Most dramatic finding of our study is that the cytoplasmic distribution of dynamin II and syndecan-4 changes in fibroblasts that have been stimulated to form the focal adhesions and stress fibers with LPA. In quiescent cells, dynamin II is evenly distributed in the cytoplasm and colocalizes with syndecan-4 near the nucleus. Upon treatment with LPA to induce focal adhesions and stress-fiber formation, dynamin II becomes markedly associated with syndecan-4 at focal adhesion sites. We further established the colocalization of syndecan-4 and dynamin with paxillin and actin as marker proteins for focal adhesions and stress fibers, respectively. All of these results suggest that the interaction between dynamin II and syndecan-4 is important in mediating focal adhesion and stress-fiber formation.
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Affiliation(s)
- Jiyun Yoo
- Department of Microbiology/Research Institute of Life Science, Gyeongsang National University, Jinju 660-701, Korea
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Choi JH, Park JB, Bae SS, Yun S, Kim HS, Hong WP, Kim IS, Kim JH, Han MY, Ryu SH, Patterson RL, Snyder SH, Suh PG. Phospholipase C-gamma1 is a guanine nucleotide exchange factor for dynamin-1 and enhances dynamin-1-dependent epidermal growth factor receptor endocytosis. J Cell Sci 2004; 117:3785-95. [PMID: 15252117 DOI: 10.1242/jcs.01220] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [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: 11/20/2022] Open
Abstract
Phospholipase C-gamma1 (PLC-gamma1), which interacts with a variety of signaling molecules through its two Src homology (SH) 2 domains and a single SH3 domain has been implicated in the regulation of many cellular functions. We demonstrate that PLC-gamma1 acts as a guanine nucleotide exchange factor (GEF) of dynamin-1, a 100 kDa GTPase protein, which is involved in clathrin-mediated endocytosis of epidermal growth factor (EGF) receptor. Overexpression of PLC-gamma1 increases endocytosis of the EGF receptor by increasing guanine nucleotide exchange activity of dynamin-1. The GEF activity of PLC-gamma1 is mediated by the direct interaction of its SH3 domain with dynamin-1. EGF-dependent activation of ERK and serum response element (SRE) are both up-regulated in PC12 cells stably overexpressing PLC-gamma1, but knockdown of PLC-gamma1 by siRNA significantly reduces ERK activation. These results establish a new role for PLC-gamma1 in the regulation of endocytosis and suggest that endocytosis of activated EGF receptors may mediate PLC-gamma1-dependent proliferation.
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Affiliation(s)
- Jang Hyun Choi
- Division of Molecular and Life Science, Pohang University of Science and Technology, San 31, Hyojadong, Pohang, Kyungbuk 790-784, Republic of Korea
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Dockko S, Han MY. Fundamental characteristics of bubbles and ramifications for the flotation process. Water Sci Technol 2004; 50:207-214. [PMID: 15686023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Flotation processes involve the use of very small bubbles (micro-bubbles) to separate particles from water. The process has become a good alternative to sedimentation, especially where the particles are small or of low density. Although the flotation process commences with a collision between particles and bubbles, most research has been focused only on the characteristics of the particles. In this paper, recent theoretical and experimental research on the characteristics of bubbles is summarized. The effect on the collision efficiency of the size and charge of bubbles is calculated through trajectory analysis. The size and charge of bubbles are measured under different conditions and the ramifications of the results are discussed. The results may lead to a better understanding and optimization of the existing process. In particular, we discuss an idea that a new advanced flotation process might be possible by the modification of the characteristics of the bubble alone or of both bubble and particle.
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Affiliation(s)
- S Dockko
- Dankook University, Chunan city, Chungnam, Korea.
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Han MY, Ahn HJ, Shin MS, Kim SR. The effect of divalent metal ions on the zeta potential of bubbles. Water Sci Technol 2004; 50:49-56. [PMID: 15566186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Micro-bubbles are used in electro-flotation (EF) and dissolved air flotation (DAF) for particle separation. The efficiency of these flotation processes depends on the collision of bubble and particle and the collision efficiency is affected by certain parameters with respect to the size and zeta potential of bubble and particle. Therefore, it is necessary to monitor not only the zeta potential of the particle, but also that of the bubble. Gas bubbles are reported to be generally negatively charged in water. In this paper, we report a study performed to measure the zeta potential of bubbles in solutions containing divalent metals and find factors which can produce positively charged bubbles. Calcium and magnesium ions were selected as divalent metal ions because natural water normally contains an appreciable quantity of them. It was found that bubbles are negatively charged in CaCl2 solutions whereas, under certain conditions, they become positively charged in MgCl2. Charge reversal of bubbles was observed above 10(-2) M Mg, especially above pH 9. A probable principle that explained the charge reversal could be a combined mechanism with both specific adsorption of hydroxylated species and formation of hydroxide precipitates. Creating solution conditions that can produce positively charged bubbles in flotation methods might make it possible to remove particles using lesser amounts of coagulant or even none at all.
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Affiliation(s)
- M Y Han
- Department of Civil Urban and Geosystem Engineering, Seoul National University, San 56-1, Shillim-dong, Gwanak-gu, Seoul, 151-742, Republic of Korea.
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Jeong HW, Han DC, Son KH, Han MY, Lim JS, Ha JH, Lee CW, Kim HM, Kim HC, Kwon BM. Antitumor effect of the cinnamaldehyde derivative CB403 through the arrest of cell cycle progression in the G2/M phase. Biochem Pharmacol 2003; 65:1343-50. [PMID: 12694875 DOI: 10.1016/s0006-2952(03)00038-8] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Cinnamaldehydes have been shown to have inhibitory effects on farnesyl protein transferase (FPTase; EC 2.5.1.29) in vitro, angiogenesis, cell-cell adhesion, and tumor cell growth and to be immunomodulators. However, the mechanisms responsible for these effects remain unknown. To elucidate the molecular mechanism of the cinnamaldehyde derivative CB403 for growth inhibition, CB403 was synthesized from 2'-hydroxycinnamaldehyde. CB403-treated cells were weakly adherent to the culture dishes. In addition, CB403 inhibited tumor growth in these cells in a concentration-dependent manner. FACS analysis using human cancer cells treated with this compound showed cell cycle arrest in mitosis, which was correlated with a marked increase in the amount of cyclin B1. Furthermore, CB403 blocked in vivo growth of human colon and breast tumor xenografts without loss of body weight in nude mice. These results support the hypothesis that the cinnamaldehyde derivative CB403 exerts cytostatic properties by inducing mitotic arrest in cancer cells.
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Affiliation(s)
- Ha-Won Jeong
- Korea Research Institute of Bioscience and Biotechnology, 52 Uendong Yoosunggu, Taejeon 305-600, South Korea
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Jeong HW, Lee HJ, Kho YH, Son KH, Han MY, Lim JS, Lee MY, Han DC, Ha JH, Kwon BM. Biological effects of G1 phase arrest compound, sesquicillin, in human breast cancer cell lines. Bioorg Med Chem 2002; 10:3129-34. [PMID: 12150857 DOI: 10.1016/s0968-0896(02)00225-0] [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
Sesquicillin, isolated from fungal fermentation broth, strongly induced G1 phase arrest in human breast cancer cells. During G1 phase arrest, the expression level of cyclin D1, cyclin A, and cyclin E was decreased, and the expression of CDK (cyclin-dependent-kinase) inhibitor, protein p21(Waf1/Cip1), was increased in a time-dependent manner in a breast cancer cell MCF-7. Interestingly, the G1 phase arrest induced by sesquicillin also occurred independently of the tumor suppressor protein, p53. Sesquicillin inhibits the proliferation of MCF-7 via G1 phase arrest in association with the induction of CDK inhibitor protein, p21(Waf1/Cip1), and the reduction of G1 phase related-cyclin proteins.
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Affiliation(s)
- Ha Won Jeong
- Korea Research Institute of Bioscience and Biotechnology, PO Box 115, Yoosung, Taejon, Republic of Korea
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Shin SY, Ko J, Chang JS, Min DS, Choi C, Bae SS, Kim MJ, Hyun DS, Kim JH, Han MY, Kim YH, Kim YS, Na DS, Suh PG, Lee YH. Negative regulatory role of overexpression of PLC gamma 1 in the expression of early growth response 1 gene in rat 3Y1 fibroblasts. FASEB J 2002; 16:1504-14. [PMID: 12374773 DOI: 10.1096/fj.02-0022com] [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: 11/11/2022]
Abstract
The early growth response 1 (Egr-1) gene product is a transcription factor that functions as an oikis factor. Loss of Egr-1 expression is closely associated with tumor formation. Phospholipase Cgamma1 (PLCgamma1) is overexpressed in some tumors, and its overexpression causes anchorage-independent growth. Here we report that overexpression of PLCgamma1 and SH2-SH3 domain of PLCgamma1 decreased induction of Egr-1 and the Egr-1-regulated genes TSP-1 and PAI-1. Results from the nuclear run-on assay and transfection experiment with the proximal 455 base pair region of the Egr-1 promoter (-454 to +1) showed that Egr-1 transcriptional activity was suppressed in PLCgamma1-3Y1 cells whereas decay of Egr-1 mRNA was similar in both cell lines. Serum response element- and ternary complex factor Elk-1-mediated transcriptional activation of the reporter gene in response to EGF were also inhibited in PLCgamma1-3Y1 cells. Pretreatment with the protein synthesis inhibitor cycloheximide (CHX) partially abrogated the serum-induced suppression of Egr-1 transcription in PLCgamma1-3Y1 cells, suggesting that a CHX-sensitive factor(s) is involved in the suppression of Egr-1 transcription in PLCgamma1-3Y1 cells. Our results demonstrated that overexpression of PLCgamma1 functions as a negative modulator of the tumor suppressor Egr-1 gene expression, possibly through inhibition of Elk-1-dependent transcriptional activity.
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Affiliation(s)
- Soon Young Shin
- Department of Biochemistry and Molecular Biology, College of Medicine, Yeungnam University, Daegu, Korea 705-717
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Yoo J, Jeong MJ, Kwon BM, Hur MW, Park YM, Han MY. Activation of dynamin I gene expression by Sp1 and Sp3 is required for neuronal differentiation of N1E-115 cells. J Biol Chem 2002; 277:11904-9. [PMID: 11809758 DOI: 10.1074/jbc.m111788200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Dynamin I is a key molecule required for the recycling of synaptic vesicles in neurons, and it has been known that dynamin I gene expression is induced during neuronal differentiation. Our previous studies established that neuronal restriction of dynamin I gene expression is controlled by Sp1 and nuclear factor-kappaB-like element-1. Here, using a series of deletion constructs and site-directed mutation, we found that transcription of dynamin I gene during neuronal differentiation of N1E-115 cells is controlled primarily by the Sp1 element located between -13 to -4 bp of the dynamin I promoter. Gel shift analysis demonstrated that in addition to Sp1, Sp3 could interact with this Sp1 element. The requirement for Sp family transcription factors in dynamin I gene expression was confirmed by using mithramycin, an inhibitor of Sp1/Sp3 binding. Mithramycin repressed dynamin I gene expression and resulted in blocking of neuronal differentiation of N1E-115 cells. The localization of the dynamin I protein was also restricted in the peripheral region of the nucleus by the mithramycin treatment. Thus, all of our results suggest that induction of dynamin I gene expression during N1E-115 cell differentiation is modulated by Sp1/Sp3 interactions with the dynamin I promoter, and its expression is important for neuronal differentiation of the N1E-115 cells.
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Affiliation(s)
- Jiyun Yoo
- Cell Biology Laboratory, Korea Research Institute of Bioscience and Biotechnology, Taejon 305-600, Korea
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