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Yoon JS, Kim ES, Hwang DW, Choi JY, Kim BK, Park BB, Choi JH, Lee YY. Biologic characteristics of bone marrow-derived mesenchymal stem cells from a patient with thalassemia syndrome. Int J Lab Hematol 2010; 33:281-9. [PMID: 21199425 DOI: 10.1111/j.1751-553x.2010.01285.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
INTRODUCTION Mesenchymal stem cells (MSCs) are capable of self-renewal and differentiating morphologically and functionally into several mesenchymal tissues. There have been contrasting data on whether MSCs are altered in various hematologic disorders. METHODS We isolated bone marrow (BM)-derived MSCs from a patient with thalassemia syndrome to compare phenotypic and functional characteristics to those from normal healthy donor. RESULTS No differences were observed between MSCs from thalassemia syndrome (T-MSCs) and those from normal healthy donor in terms of morphology, phenotype, karyotype, multidifferentiation capacity. In mixed lymphocyte reaction, T-MSCs strongly inhibited the proliferation of allogeneic T cells in association with reduced proportion of CD3(+), CD4(+), and CD8(+) cells. Furthermore, the fraction of Treg cells was increased under the culture with T-MSCs, suggesting that T-MSCs exert normal immunomodulatory function. In addition, T-MSCs expressed hematopoietic cytokines and supported hematopoiesis, which was comparable to those from normal BM-derived MSCs. CONCLUSION T-MSCs exhibited normal phenotype, karyotype as well as normal immunomodulatory function, and autologous MSCs from patients with thalassemia syndrome may be an attractive source of stem cell in terms of hematopoietic support as well as immunomodulatory activity.
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Park JA, Kim BK, Choi HN, Lee WY. Electrochemical Determination of Dopamine Based on Carbon Nanotube-Sol-Gel Titania-Nafion Composite Film Modified Electrode. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.11.3123] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Na HR, Kim S, Choi SH, Yang DW, Bae HJ, Kim JE, Park MY, Shim YS, Kim BK, Kwon JC, Yoo BG, Kim BC, Lee JS. Donepezil treatment in Alzheimer's disease patients with and without cerebrovascular lesions: A preliminary report. Geriatr Gerontol Int 2010; 11:90-7. [DOI: 10.1111/j.1447-0594.2010.00649.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Kim K, Lee CH, Kim BK, Mao JJ. Anatomically shaped tooth and periodontal regeneration by cell homing. J Dent Res 2010; 89:842-7. [PMID: 20448245 DOI: 10.1177/0022034510370803] [Citation(s) in RCA: 134] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Tooth regeneration by cell delivery encounters translational hurdles. We hypothesized that anatomically correct teeth can regenerate in scaffolds without cell transplantation. Novel, anatomically shaped human molar scaffolds and rat incisor scaffolds were fabricated by 3D bioprinting from a hybrid of poly-epsilon-caprolactone and hydroxyapatite with 200-microm-diameter interconnecting microchannels. In each of 22 rats, an incisor scaffold was implanted orthotopically following mandibular incisor extraction, whereas a human molar scaffold was implanted ectopically into the dorsum. Stromal-derived factor-1 (SDF1) and bone morphogenetic protein-7 (BMP7) were delivered in scaffold microchannels. After 9 weeks, a putative periodontal ligament and new bone regenerated at the interface of rat incisor scaffold with native alveolar bone. SDF1 and BMP7 delivery not only recruited significantly more endogenous cells, but also elaborated greater angiogenesis than growth-factor-free control scaffolds. Regeneration of tooth-like structures and periodontal integration by cell homing provide an alternative to cell delivery, and may accelerate clinical applications.
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Yoon YJ, Chae SW, Kim BK, Park MJ, Kwak JS. Interfacial reactions of nano-structured Cu-doped indium oxide/indium tin oxide ohmic contacts to p-GaN. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2010; 10:3254-3259. [PMID: 20358934 DOI: 10.1166/jnn.2010.2280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Interfacial microstructure and elemental diffusion of Cu-doped indium oxide (CIO)/indium tin oxide (ITO) ohmic contacts to p-type GaN for light-emitting diodes (LEDs) were investigated using cross-sectional transmission electron microscopy (XTEM), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction. The CIO/ITO contacts gave specific contact resistances of approximately 10(-4) omegacm2 and transmittance greater than 95% at a wavelength of 405 nm when annealed at 630 degrees C for 1 min in air. After annealing at 630 degrees C, multi-component oxides composed of Ga2O3-In2O3, Ga2O3-CuO, and In2O3-CuO formed at the interface between p-GaN and ITO. Formation of multi-component oxides reduced the barrier height between p-GaN and ITO due to their higher work functions than that of ITO, and caused Ga in the GaN to diffuse into the CIO/ITO layer, followed by generation of acceptor-like Ga vacancies near the GaN surface, which lowered contact resistivity of the CIO/ITO contacts to p-GaN after the annealing.
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Kim N, Jhang Y, Park JM, Kim BK, Kwon O, Lee J, Lee JS, Koo JS. Aggressive glucose control for acute ischemic stroke patients by insulin infusion. J Clin Neurol 2009; 5:167-72. [PMID: 20076797 PMCID: PMC2806538 DOI: 10.3988/jcn.2009.5.4.167] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2009] [Revised: 09/28/2009] [Accepted: 09/28/2009] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND AND PURPOSE Hyperglycemia after acute ischemic stroke (AIS) is associated with poor outcomes. However, there is no consensus as to the optimal method for glycemic control. We designed an insulin infusion protocol for aggressive glucose control and investigated its efficacy and safety. METHODS We applied our protocol to patients within 48 hours after AIS or transient ischemic attack (TIA) with an initial capillary glucose level of between 100 and 399 mg/dL (5.6-22.2 mmol/L). An insulin solution comprising 40 or 50 U of human regular insulin in 500 mL of 5% dextrose was administered for 24 hours. Capillary glucose was measured every 2 hours and the infusion rate was adjusted according to a nomogram with a target range of 80-129 mg/dL (4.4-7.2 mmol/L). Changes in glucose and overall glucose levels during insulin infusion were analyzed according to the presence of diabetes or admission hyperglycemia (admission glucose >139 mg/dL or 7.7 mmol/L) by the generalized estimating equation method. RESULTS The study cohort comprised 115 consecutive patients. Glucose was significantly lowered from 160+/-57 mg/dL (8.9+/-3.2 mmol/L) at admission to 93+/-28 mg/dL (5.2+/-1.6 mmol/L) during insulin infusion (p<0.05). Laboratory hypoglycemia (capillary glucose <80 mg/dL or 4.4 mmol/L) occurred in 91 (71%) patients, 11 (10%) of whom had symptomatic hypoglycemia. Although glucose levels were significantly lowered and maintained within the target range in all patients, overall glucose levels were significantly higher in patients with diabetes or hyperglycemia (p<0.05). CONCLUSIONS Our insulin-infusion protocol was effective in glycemic control for patients with AIS or TIA. Further modification is needed to improve the efficacy and safety of this procedure, and tailored intervention should be considered according to glycemic status.
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Kang JH, Kim BK, Park BI, Kim HJ, Ko HM, Yang SY, Kim MS, Jung JY, Kim WJ, Oh WM, Kim SH, Kim JH. Parasympathectomy induces morphological changes and alters gene-expression profiles in the rat submandibular gland. Arch Oral Biol 2009; 55:7-14. [PMID: 20003962 DOI: 10.1016/j.archoralbio.2009.11.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2009] [Revised: 10/27/2009] [Accepted: 11/09/2009] [Indexed: 11/26/2022]
Abstract
OBJECTIVE The chorda-lingual (CL) nerve carries parasympathetic fibers to the hilum of the sublingual and submandibular glands (SMGs) and evokes the secretion of saliva. The effect of cutting the CL nerve on the biological processes in SMGs was investigated by examining the gene-expression profiles in the SMGs after a surgical parasympathectomy. METHODS At day 3 after the CL nerve cut, the changes in the SMGs at both the experimental cut and contralateral control sides were analysed by microarray and light microscopy. The expression levels of 6 selected genes were confirmed by real-time PCR, Western blot and immunofluorescence staining. RESULTS The wet weight of the parasympathectomised SMGs decreased significantly compared to that of the contralateral side (p<0.05). Histological analyses after the parasympathectomy showed a widened interacinar space as well as some atropic changes to the acini of the SMGs in the cut side. Microarray analysis revealed that twofold differential expression in mRNA expression in the parasympathectomized SMGs were detected in 88 genes (0.004%): 41 genes were overexpressed, 11 were underexpressed and 36 were unknown. Changes of the expression of 6 selected genes detected by Western blot and/or real-time PCR were consistent with the microarray data. CONCLUSION The important genes involved in biological processes for salivation were identified through a large-scale gene expression analysis.
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Kim MS, Kim JH, Lee MR, Kang JH, Kim HJ, Ko HM, Choi CH, Jung JY, Koh JT, Kim BK, Oh HK, Kim WJ, Lee EJ, Kim SH. Effects of alendronate on a disintegrin and metalloproteinase with thrombospondin motifs expression in the developing epiphyseal cartilage in rats. Anat Histol Embryol 2009; 38:154-60. [PMID: 19183348 DOI: 10.1111/j.1439-0264.2008.00920.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A disintegrin and metalloproteinase with thrombospondin motifs (ADAMTS) have been reported to play a role in the degradation of aggrecan, a major component of cartilage. This study was performed to examine the effects of alendronate on the expression of ADAMTS in developing femoral epiphyseal cartilage. Primary cultured chondrocytes from this cartilage were treated with alendronate in vitro and postnatal day 1 rats were injected subcutaneously with alendronate (1 mg/kg) every second day in vivo. The number of cultured chondrocytes and their aggrecan mRNA levels were unaffected by the alendronate treatment at 10(-6) to 10(-4) M concentrations. The mRNA levels of ADAMTS-1, -2 and -9 in chondrocytes were also unaffected. However, the levels of ADAMTS-5 and -4 were reduced significantly by the same treatment. The thickness of the proliferating chondrocyte layers and the aggrecan mRNA levels in the epiphysis were unaffected by the alendronate treatment in vivo. However, the hypertrophied chondrocyte layers became significantly thicker, and the size of the secondary ossification centre was reduced significantly by the same treatment (P < 0.05). Both ADAMTS-4 and -5 mRNA expressions were also reduced significantly in vivo. The immunoreactivity against ADAMTS-4 was seen in hypertrophied chondrocytes and reduced significantly by the alendronate treatment. These results suggested that alendronate can inhibit the degradation of aggrecan in the articular cartilage by downregulating the expression of matrix enzymes such as ADAMTS-4 and -5.
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Lee SK, Kim BK, Kim TI, Kim WH. Differential diagnosis of intestinal Behçet's disease and Crohn's disease by colonoscopic findings. Endoscopy 2009; 41:9-16. [PMID: 19160153 DOI: 10.1055/s-0028-1103481] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND STUDY AIMS Intestinal Behçet's disease and Crohn's disease are chronic inflammatory bowel diseases that are difficult to distinguish from each other. We investigated their colonoscopic features and identified simple and valuable strategies for differential diagnosis. PATIENTS AND METHODS Between 1995 and 2006, 250 consecutive patients with ulcers on colonoscopy (115 Behçet's, 135 Crohn's cases) were reviewed. All patients with Behçet's fulfilled the criteria of the International Study Group for Behçet's Disease or of the Behçet's Disease Research Committee of Japan, while Crohn's disease was confirmed by clinicopathological data. Patients were randomly allocated to a training set (70 %) or a validation set (30 %). Ulcer shapes, distributions, numbers, margins, and border contours, and the presence of aphthous, cobblestone, perianal, and strictured lesions were compared, in the training set. Univariate and multivariate analysis were performed, using the X2-test and logistic regression. In addition, a classification and regression tree (CART) was then used to generate simplified algorithms for differential diagnosis. RESULTS Round shape, five or fewer in number, focal distributions, and absence of aphthous and cobblestone lesions were significantly dominant features in Behçet's disease, according to multivariate analysis of the training set. The CART-generated algorithms proposed sequential use of shape (round, irregular/geographic, or longitudinal) and distribution (focal single/focal multiple, or segmental/diffuse). Diagnosis of Behçet's disease in the validation set produced sensitivity, specificity, and negative and positive predictive values of 94.3 %, 90.0 %, 94.7 %, and 89.2 %, respectively. Using the CART model, we made the correct diagnosis of intestinal Behçet's disease or Crohn's disease in 69 of 75 patients (92 %). CONCLUSION It was determined that round and longitudinal ulcers are suggestive of Behçet's disease and Crohn's disease, respectively. Irregular/geographic-shaped ulcers and focal distributions are suggestive of Behçet's disease, while segmental/diffuse lesions suggest Crohn's.
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Kim BK, Hwang SJ, Park JB, Park HJ. Characteristics of felodipine-located poly(ε-caprolactone) microspheres. J Microencapsul 2008; 22:193-203. [PMID: 16019904 DOI: 10.1080/02652040400015346] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Felodipine-loaded poly (epsilon-caprolactone) (PCL) microspheres were prepared by two methods, the conventional emulsion solvent evapouration method and the quenching method. The aim of this work was to investigate the effects of process parameters such as emulsion type, drug loading, molecular-weight of the polymer, types of emulsion stabilizer and dispersed phase solvents, as well as preparation methods. The results show that, when conventional emulsion solvent evapouration method was used, the o/w-method produced smaller mean size and higher encapsulation efficiency compared with the o/o-method. The encapsulation efficiencies increased with an increase in the molecular weight and a decrease in crystallinity of PCL. The size of microspheres varied with the type of emulsion stabilizer used, smaller microspheres with PVA and narrow size distribution with Pol 237. The water solubility of the dispersed phase solvent was one of the critical factors in controlling the encapsulation efficiency and microsphere mean size. When water-soluble solvents such as acetonitrile and ethyl formate were used, the encapsulation efficiencies decreased due to higher evapouration rate. When quenching methods were used, in contrast to the conventional emulsion solvent evapouration method, very narrowly size-distributed but bigger microspheres were obtained.
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Kim BK, Kim D, Cho SH, Yuk SH. Hydrophilized poly(lactide-co-glycolide) nanospheres with poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer. J Microencapsul 2008; 21:697-707. [PMID: 15799220 DOI: 10.1080/02652040400000520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
A novel method for preparing the PLGA nanospheres with hydrophilic surface has been designed and characterized. Because of good solubility of tetraglycol in water, PLGA (poly(lactide-co-glycolide)) nanospheres were formed by spraying the PLGA/tetraglycol solution into water. The size of PLGA nanospheres was manipulated by changing the concentration of PLGA/tetraglycol solution. Based on the hydrophobic interaction between PLGA and poly(propylene oxide) domain of F-127 (one of Pluronics, poly(ethylene oxide)-poly(propylene oxide)poly(ethylene oxide) triblock copolymer, F-127-coated PLGA nanospheres was prepared to enhance the stability of PLGA nanospheres in the aqueous media. For the application as a drug delivery vehicle, it was characterized by measuring the loading amount, the encapsulation efficiency and the release pattern of drug. Paclitaxel used as a potent anti-cancer drug was selected as a model drug.
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Na HR, Choi SH, Kim JE, Yang DW, Shim YS, Park MY, Kim BK, Kwon JC, Yoo BG, Kim BC, Bae HJ, Han MK, Kim S. O2‐04–07: Treatment with donepezil in Korean Alzheimer patients with and without cerebrovascular factors: One‐year follow‐up study. Alzheimers Dement 2008. [DOI: 10.1016/j.jalz.2008.05.337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Choi SH, Kim SY, Na HR, Kim BK, Yang DW, Kwon JC, Park MY. Effect of ApoE genotype on response to donepezil in patients with Alzheimer's disease. Dement Geriatr Cogn Disord 2008; 25:445-50. [PMID: 18401173 DOI: 10.1159/000124752] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/24/2008] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS The possible influence of apolipoprotein E (ApoE) genotype on the response to acetylcholinesterase inhibitor therapy in patients with Alzheimer's disease (AD) remains a matter of controversy. In order to address this issue, we investigated the effects of ApoE genotype on the clinical response to donepezil in patients with mild to moderate AD. METHODS An open study was carried out in 51 patients with probable AD who were treated with 5-10 mg of donepezil per day for 48 weeks. RESULTS Eighteen (35.3%) of the 51 patients had 1 or 2 ApoE epsilon4 alleles. ApoE epsilon4 carriers with AD showed a mean 1.1-point increase from the baseline score of 23.9 on the 70-point Alzheimer's Disease Assessment Scale-Cognitive Component at 48 weeks, while the ApoE epsilon4 noncarrier group showed a 3.1-point increase from the baseline score of 22.5 (p = 0.03). The ApoE epsilon4 carrier group exhibited a mean 0.13-point worsening from the baseline score of 0.97 on the Korean Instrumental Activities of Daily Living at 48 weeks, while the ApoE epsilon4 noncarrier group exhibited a 0.17-point worsening from the baseline score of 0.64 (p = 0.05). CONCLUSION AD patients who carry the ApoE epsilon4 allele may respond more favorably to donepezil than epsilon4 noncarriers.
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Kang L, Lee ST, Im W, Kim SC, Hun KS, Kim BK, Kim M. Screening of the A11084G Polymorphism and Scanning of a Mitochondrial Genome SNP in Korean Migraineurs. J Clin Neurol 2007; 3:127-32. [PMID: 19513279 PMCID: PMC2686844 DOI: 10.3988/jcn.2007.3.3.127] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2006] [Accepted: 08/16/2007] [Indexed: 12/03/2022] Open
Abstract
Background and purpose Migraine is a genetically heterogeneous disorder that is frequently associated with a familial history, and mitochondrial dysfunction has been suggested to be associated with its pathogenesis. We screened and scanned mitochondrial gene polymorphisms to determine the significance of mitochondrial DNA mutations in Korean migraineurs. Methods One hundred and sixty-four migraineurs aged 33.9±11.7 years (mean±SD range 12 to 65 years) were studied. Clinical data of the familial history were obtained, and blood samples were collected for DNA purification. An A-to-G substitution at mitochondrial DNA (mtDNA) position 11,084 (A11084G) was determined by a polymerase chain reaction (PCR) with BsmI restriction. In addition, new single-nucleotide polymorphism (SNP) sites in the mitochondrial genome were scanned for using PCR and direct sequencing. Results Ninety-eight migraine patients (59.8%) had a maternal familial history. The A11084G polymorphism, which was previously reported in 25% of Japanese migraineurs, was not evident in our Korean migraine patients. However, scanning of new SNP sites in mtDNA revealed six candidate SNPs whose incidences were higher in migraine patients than in normal subjects. Conclusions Our study found no association between the A11084G polymorphism in mitochondrial DNA and migraine in Koreans. However, we found potential new mitochondrial SNP sites in Korean migraineurs, which warrant further investigation.
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Bae HJ, Lee J, Park JM, Kwon O, Koo JS, Kim BK, Pandey DK. Risk Factors of Intracranial Cerebral Atherosclerosis among Asymptomatics. Cerebrovasc Dis 2007; 24:355-60. [PMID: 17690548 DOI: 10.1159/000106982] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2006] [Accepted: 04/13/2007] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Little information is available regarding the risk factors for intracranial cerebral atherosclerosis (ICAS), particularly among asymptomatics. METHODS Data from a consecutive series of 1,208 subjects aged > or =40 years, with no history of stroke, and who had undergone transcranial Doppler ultrasonography (TCD) were collected prospectively. The role of classic risk factors was assessed in the presence and severity of asymptomatic ICAS, which was determined by TCD. RESULTS Regarding the presence of ICAS, the adjusted odds ratios (95% confidence intervals) were as follows: 1.22 (1.08-1.37) for every 10-year increase in age, 1.44 (1.08-1.91) for hypertension and 1.86 (1.33-2.59) for diabetes mellitus. No significant association was observed with regard to male sex, smoking or hyperlipidemia. CONCLUSION The findings suggest that age, hypertension and diabetes mellitus are significant risk factors for ICAS in asymptomatic populations.
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Jhang Y, Lee JJ, Park JM, Koo JS, Kim BK, Kwon O. Polyneuropathy associated with IgA paraproteinemia and amyloidosis: a case report and literature review. J Clin Neurol 2007; 3:116-9. [PMID: 19513304 PMCID: PMC2686858 DOI: 10.3988/jcn.2007.3.2.116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2006] [Accepted: 03/20/2007] [Indexed: 01/15/2023] Open
Abstract
Paraproteinemia potentially causes peripheral neuropathy via an unknown underlying pathogenetic mechanism. We report a case of pathologically proven amyloid neuropathy with AL amyloidosis with an IgA kappa light chain, which was initially diagnosed as neuropathy associated with monoclonal gammopathy of undetermined significance. This case indicates that in cases of neuropathy with paraproteinemia, the other potential causes should be excluded by appropriate means, especially pathological evaluations.
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Yang JK, Song KH, Kim BK, Hong SC, Cho DE, Chang YY. Arsenic removal by iron and manganese coated sand. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2007; 56:161-169. [PMID: 17951880 DOI: 10.2166/wst.2007.681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
In this study, as a promising technique for the treatment of both As(III) and As(V) at the same time in a single reactor, a column reactor containing both manganese-coated sand (MCS) and iron-coated sand (ICS), at different configuration of MCS and ICS, was used to treat wastewater contaminated with As(III). Prior to column experiments, batch experiments for the adsorption of As(V) by ICS were performed with variation of solution pH, ionic strength and types of background ions to investigate the effect of these parameters on the As(V) adsorption behaviour. As(V) adsorption onto ICS was quite similar with the variation of ionic strength by using NaNO3 as a background ion as well as in the presence of different types of background ions except phosphate. The adsorption curves shifted to the lower pH region with the increase of the initial arsenic concentration due to the finite number of adsorption sites on the ICS. For model prediction on the adsorption of As(V) onto ICS, the MINEQL program employing an inner-sphere complexation and a diffuse layer model was used. Model predictions generally agreed well with experimental results. From the column test, column system packed with equal ratio of MCS and ICS was identified as the best system due to a promising oxidation efficiency of As(III) to As(V) by MCS and adsorption of As(V) by both MCS and ICS.
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Moon HW, Shin S, Kim HY, Kim YR, Cho HI, Yoon SS, Park S, Kim BK, Chun H, Kim HC, Park CJ, Min YH, Lee DS. Therapeutic use of granulocyte-colony stimulating factor could conceal residual malignant cells in patients with AML1/ETO+ acute myelogenous leukemia. Leukemia 2006; 20:1408-13. [PMID: 16791271 DOI: 10.1038/sj.leu.2404286] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We have experienced a number of cases of AML1/ETO+ acute myelogenous leukemia that showed remission based on bone marrow (BM) morphological criteria, but that revealed clonal abnormalities in most cells by fluorescence in situ hybridization (FISH). Interestingly, most of these cases had AML with AML1/ETO rearrangement. The malignant cells were differentiated and considered mature cells after granulocyte-colony stimulating factor (G-CSF) treatment. To clarify the possible mechanisms underlying this phenomenon, we investigated the expression levels of G-CSFR in AML cells with AML1/ETO rearrangement by flow cytometry and real-time polymerase chain reaction (PCR). The number of AML1/ETO+ cells expressing G-CSFR at baseline was significantly higher than that of AML1/ETO- AML cells (2673 vs 522). In addition, the G-CSFR gene was more highly expressed in AML1/ETO+ cells than in AML1/ETO- cells by real-time PCR. This study reveals that cases showing remission after treatment with G-CSF mostly had leukemia with AML1/ETO rearrangement. This finding might be explained by the higher expression of G-CSF receptor in AML1/ETO+ cells than in AML1/ETO- cells. We recommend that remission should be confirmed by FISH, because malignant clones can be differentiated and masked in morphological examination or chromosome test, especially for AML with AML1/ETO rearrangement.
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Moon SY, Kim JS, Kim BK, Kim JI, Lee H, Son SI, Kim KS, Rhee CK, Han GC, Lee WS. Clinical characteristics of benign paroxysmal positional vertigo in Korea: a multicenter study. J Korean Med Sci 2006; 21:539-43. [PMID: 16778402 PMCID: PMC2729964 DOI: 10.3346/jkms.2006.21.3.539] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Benign paroxysmal positional vertigo (BPPV) is characterized by episodic vertigo and nystagmus provoked by head motions. To study the characteristics of BPPV in a large group of patients in Korea, we retrospectively analyzed clinical features of 1,692 patients (women: 1,146, 67.7%; men: 54.6, 32.3%; mean age: 54.8+/-14.0 yr), who had been diagnosed as BPPV by trained neuro-otologists Dizziness Clinics. The diagnosis of BPPV was based on typical nystagmus elicited by positioning maneuvers. Posterior semicircular canal was involved in 60.9% of the patients, horizontal canal in 31.9%, anterior canal in 2.2%, and mixed canals in 5.0%. The horizontal canal type of BPPV (HC-BPPV) comprised 49.5% of geotropic and 50.5% of apogeotropic types. We could observe significant negative correlation between the proportion of HC-BPPV of each clinic and the mean time interval between the symptom onset and the first visit to the clinics (r=-0.841, p<0.05). Most patients were successfully treated with canalith repositioning maneuvers (86.9%). The high incidence of HC-BPPV in this study may be explained by relatively shorter time interval between the symptom onset and visit to the Dizziness Clinics in Korea, compared with previous studies in other countries.
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Kim SJ, Jeong HJ, Kim BK, Kim NH, Kim JS, Choi KS, Lee HJ, Kang ST, Shin SS, Kim WI, Eom HS, Lee KM, Um JY, Hong SH, Kim HM. Anti-inflammatory effect of jeongshintang through suppression of p38 activation in human astrocytoma, U373MG cells. Exp Mol Pathol 2006; 81:85-91. [PMID: 16698013 DOI: 10.1016/j.yexmp.2005.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2005] [Revised: 11/18/2005] [Accepted: 12/01/2005] [Indexed: 01/22/2023]
Abstract
Jeongshintang (JST) is a Korean herbal prescription, which has been successfully used for cerebral diseases. However, the anti-inflammatory effect of JST on Alzheimer's disease (AD) is still not fully understood. In this study, we investigated the effects of JST in attenuating the inflammatory response induced by interleukin (IL)-1beta plus beta-amyloid [1-42] fragment (A beta) in the human astrocyte cell line, U373MG. The production of IL-6, IL-8, and prostaglandin (PG)E2 was significantly increased by IL-1beta plus A beta (1-42) in a time-dependent manner (P < 0.05). JST significantly inhibited the IL-1beta plus A beta (1-42)-induced IL-6, IL-8, and PGE2 production at 24 h (P < 0.05). Maximal inhibition rate of IL-6, IL-8, and PGE2 production by JST was about 54.40%, 56.01%, and 44.06% respectively. JST (0.01-1 mg/ml) also attenuated the expression of cyclooxygenase (COX)-2 and activation of p38 MAPK induced by IL-1beta and A beta (1-42). These results demonstrated that JST has an anti-inflammatory effect, which might explain its beneficial effect in the treatment of various neurodegenerative diseases such as AD.
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Kim M, Bae HJ, Lee J, Kang L, Lee S, Kim S, Lee JE, Lee KM, Yoon BW, Kwon O, Koo JS, Kim BK. APOE epsilon2/epsilon4 polymorphism and cerebral microbleeds on gradient-echo MRI. Neurology 2006; 65:1474-5. [PMID: 16275840 DOI: 10.1212/01.wnl.0000183311.48144.7f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The association of APOE genotypes with cerebral microbleeds (CMBs) was examined on the basis of the location of CMBs in 414 patients who were admitted primarily because of stroke. With respect to possession of the epsilon2 or epsilon4 allele, the adjusted odds ratio was 1.94 (1.05 to 3.58) for lobar CMBs but 1.21 (0.69 to 2.11) for nonlobar CMBs. This suggests that the pathogenesis of CMBs may differ depending on their location.
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Huh KC, Lee TH, Kim SM, Im EH, Choi YW, Kim BK, Jung DJ, Choi WJ, Kang YW. Intussuscepted sigmoid colonic lipoma mimicking carcinoma. Dig Dis Sci 2006; 51:791-5. [PMID: 16615005 DOI: 10.1007/s10620-006-3208-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2005] [Accepted: 04/04/2005] [Indexed: 02/08/2023]
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Kim JS, Yoon B, Choi KD, Oh SY, Park SH, Kim BK. Upbeat nystagmus: clinicoanatomical correlations in 15 patients. J Clin Neurol 2006; 2:58-65. [PMID: 20396486 PMCID: PMC2854944 DOI: 10.3988/jcn.2006.2.1.58] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Accepted: 02/14/2006] [Indexed: 11/23/2022] Open
Abstract
Background and Purpose The mechanism of upbeat nystagmus is unknown and clinicoanatomical correlative studies in series of patients with upbeat nystagmus are limited. Methods Fifteen patients with upbeat nystagmus received full neuro-ophthalmological evaluation by the senior author. Nystagmus was observed using video Frenzel goggles and recorded with video-oculography. Brain lesions were documented with MRI. Results Lesions responsible for nystagmus were found throughout the brainstem, mainly in the paramedian area: in the medulla (n=8), pons (n=3), pons and midbrain with or without cerebellar lesions (n=3), and midbrain and thalamus (n=1). Underlying diseases comprised cerebral infarction (n=10), multiple sclerosis (n=2), cerebral hemorrhage (n=1), Wernicke encephalopathy (n=1), and hydrocephalus (n=1). Upbeat nystagmus was mostly transient and showed occasional evolution during the acute phase. In one patient with a bilateral medial medullary infarction, the upbeat nystagmus changed into a hemiseesaw pattern with near complete resolution of the unilateral lesion. Gaze and positional changes usually affected both the intensity and direction of the nystagmus. A patient with a cervicomedullary lesion showed a reversal of upbeat into downbeat nystagmus by straight-head hanging and leftward head turning while in the supine position. Gaze-evoked nystagmus (n=7), ocular tilt reaction (n=7), and internuclear ophthalmoplegia (n=4) were also commonly associated with upbeat nystagmus. Conclusions In view of the responsible lesions and associated neuro-ophthalmological findings, upbeat nystagmus may be ascribed to damage to the pathways mediating the upward vestibulo-ocular reflex or the neural integrators involved in vertical gaze holding.
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Bae HJ, Yoon DS, Lee J, Kim BK, Koo JS, Kwon O, Park JM. In-Hospital Medical Complications and Long-Term Mortality After Ischemic Stroke. Stroke 2005; 36:2441-5. [PMID: 16224097 DOI: 10.1161/01.str.0000185721.73445.fd] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE Inhospital medical complications account for a considerable portion of deaths during the early stage of stroke. However, relatively few studies have examined their long-term effects on mortality in stroke patients. METHODS We prospectively and consecutively collected data on 579 patients with acute ischemic stroke from November 1998 to February 2001. Mortality was confirmed using national death certificate data from 1999 to 2003. RESULTS During admission, one or more medical complications requiring intervention developed in 160 of these 579 patients (27.6%). For these 160 subjects, the 30-day, 90-day, 1-year, 2-year, 3-year, and 4-year mortalities were 16.3, 29.4, 46.9, 55.6, 61.3, and 70.7%, whereas the mortality figures for those without such complications (n=419) were 1.4, 3.8, 8.8, 15.0, 19.1, and 22.4 (P<0.001 with log-rank test). To eliminate the short-term effects of these complications and thus reveal their long-term effects, we investigated differences in mortality versus the presence of inhospital complications at more than 30 days, 90 days, 1 year, 2 years, and 3 years after stroke, respectively. Cox's proportional hazard regression analysis was applied at these times after stroke and showed that all hazard ratios of medical complications in terms of mortality were statistically larger than one, regardless of adjusting for effects of potential predictors on mortality. CONCLUSIONS Our study shows that stroke patient mortality is influenced by inhospital medical complications significantly up to the chronic stage. This finding suggests that the appropriate prevention and management of inhospital complications could improve short-term and long-term prognoses after stroke.
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