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Park JY, Kim YS, Shin DH, Choi JS, Kim KH, Bae YK. Primary cutaneous peripheral T-cell lymphoma in a patient with X-linked agammaglobulinaemia. Br J Dermatol 2010; 164:677-9. [PMID: 21083545 DOI: 10.1111/j.1365-2133.2010.10142.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
MESH Headings
- Adult
- Agammaglobulinemia/complications
- Antigens, CD/analysis
- Genetic Diseases, X-Linked/complications
- Humans
- Immunohistochemistry
- Lymphoma, T-Cell, Cutaneous/immunology
- Lymphoma, T-Cell, Cutaneous/pathology
- Lymphoma, T-Cell, Peripheral/immunology
- Lymphoma, T-Cell, Peripheral/pathology
- Male
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Choi JS, Kim MJ, Kim JH, Choi JY, Chung YE, Park MS, Kim KW. Comparison of multi-echo and single-echo gradient-recalled echo sequences for SPIO-enhanced liver MRI at 3 T. Clin Radiol 2010; 65:916-23. [PMID: 20933647 DOI: 10.1016/j.crad.2010.07.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2010] [Revised: 07/02/2010] [Accepted: 07/14/2010] [Indexed: 01/04/2023]
Abstract
AIM To assess the utility of a T2*-weighted, multi-echo data imaging combination sequenced on superparamagnetic iron oxide (SPIO)-enhanced liver magnetic resonance imaging (MRI) using a 3 T system. MATERIALS AND METHODS Fifty patients underwent SPIO-enhanced MRI at 3 T using T2*-weighted, single-echo, gradient-recalled echo (GRE) sequences [fast imaging with steady precession; repetition time (TR)/echo time (TE), 126 ms/9 ms; flip angle, 30°] and multi-echo GRE (multi-echo data image combination) sequences (TR/TE, 186 ms/9 ms; flip angle, 30°). Three radiologists independently reviewed the images in a random order. The sensitivity and accuracy for the detection of focal hepatic lesions (a total of 76 lesions in 33 patients; 48 solid lesions, 28 non-solid lesions) were compared by analysing the area under the receiver operating characteristic curves. Image artefacts (flow artefacts, susceptibility artefacts, dielectric artefacts, and motion artefacts), lesion conspicuity, and overall image quality were evaluated according to a four-point scale: 1, poor; 2, fair; 3, good; 4, excellent. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the lesions were compared. RESULTS Image artefacts were more frequent with single-echo GRE (p<0.05). The mean scale of image quality assessment for flow, susceptibility, dielectric, and motion artefacts were 2.76, 3.13, 3.42, and 2.89 with single-echo, respectively, compared with 3.47, 3.43, 3.47, and 3.39, respectively, with multi-echo GRE. There was no significant difference in lesion conspicuity between single-echo (3.15) and multi-echo (3.30) GRE sequences. The overall image quality was significantly (p<0.05) better with multi-echo (3.37) than with single-echo GRE (2.89). The mean SNR and CNR of the lesions were significantly (p<0.05) higher on multi-echo (79±23 and 128±59, respectively) images than on single-echo (38±11 and 102±44, respectively) images. Lesion detection accuracy and sensitivity were not significantly different between the two sequences. Mean accuracies and sensitivities were 0.864 and 0.785 for single-echo and 0.847 and 0.785 for multi-echo GRE, respectively. CONCLUSION At 3 T, the T2*-weighted, multi-echo data image combination sequence performs comparably to the T2*-weighted, single-echo GRE sequence for SPIO-enhanced MRI with good overall image quality and a decrease in undesired artefacts.
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Reinherz EL, Li J, Smoylar A, Wyss DF, Knoppers MH, Willis KJ, Arulanandam AR, Choi JS, Wagner G. Response: CD2: An Exception to the Immunologlobulin Superfamily Concept? Science 2010; 273:1242. [PMID: 17842602 DOI: 10.1126/science.273.5279.1242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Li C, Lee MY, Choi JS. Effects of silybinin, CYP3A4 and P-glycoprotein inhibitor in vitro, on the bioavailability of loratadine in rats. DIE PHARMAZIE 2010; 65:510-514. [PMID: 20662320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The effect of silybinin on the pharmacokinetics of orally and intravenously administered loratadine in rats was investigated. Pharmacokinetic parameters of loratadine were determined in rats following oral (4 mg x kg(-1)) and intravenous (1 mg x kg(-1)) administration to rats in the presence and absence of silybinin (0.3, 1.5 and 6 mg x kg(-1)). Compared to those animals in an oral control group (given loratadine alone), the area under the plasma concentration-time curve (AUC) and the peak plasma concentration (C(max)) of loratadine were increased significantly (P < 0.05 for 1.5 mg x kg(-1), P < 0.01 for 6 mg x kg(-1)) by 50.0-76.7% and 65.4-90.1%, respectively, by silybinin. Consequently, the absolute bioavailability of loratadine in the presence of silybinin (1.5 and 6 mg x kg(-1)) was 8.6-10.2%, which was significantly (1.5 mg x kg(-1), P < 0.05; 6 mg x kg(-1), P < 0.01) enhanced compared to that in oral control group (5.8%). Moreover, the relative bioavailability of loratadine was 1.50- to 1.77-fold greater than that in the control group. In contrast, silybinin had no effect on any pharmacokinetic parameters of loratadine given intravenously, implying that coadministration of silybinin could inhibit the cytochrome P450 (CYP) 3A4-mediated metabolism of loratadine, resulting in reducing gastrointestinal and hepatic first-pass metabolism, and the P-glycoprotein (P-gp) efflux pump in the small intestine. Silybinin significantly enhanced the oral bioavailability of loratadine, suggesting that concurrent use of silybinin and loratadine should be monitored closely for potential drug interactions.
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Estacion M, Choi JS, Eastman EM, Lin Z, Li Y, Tyrrell L, Yang Y, Dib-Hajj SD, Waxman SG. Can robots patch-clamp as well as humans? Characterization of a novel sodium channel mutation. J Physiol 2010; 588:1915-27. [PMID: 20123784 DOI: 10.1113/jphysiol.2009.186114] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Ion channel missense mutations cause disorders of excitability by changing channel biophysical properties. As an increasing number of new naturally occurring mutations have been identified, and the number of other mutations produced by molecular approaches such as in situ mutagenesis has increased, the need for functional analysis by patch-clamp has become rate limiting. Here we compare a patch-clamp robot using planar-chip technology with human patch-clamp in a functional assessment of a previously undescribed Nav1.7 sodium channel mutation, S211P, which causes erythromelalgia. This robotic patch-clamp device can increase throughput (the number of cells analysed per day) by 3- to 10-fold. Both modes of analysis show that the mutation hyperpolarizes activation voltage dependence (8 mV by manual profiling, 11 mV by robotic profiling), alters steady-state fast inactivation so that it requires an additional Boltzmann function for a second fraction of total current (approximately 20% manual, approximately 40% robotic), and enhances slow inactivation (hyperpolarizing shift--15 mV by human,--13 mV robotic). Manual patch-clamping demonstrated slower deactivation and enhanced (approximately 2-fold) ramp response for the mutant channel while robotic recording did not, possibly due to increased temperature and reduced signal-to-noise ratio on the robotic platform. If robotic profiling is used to screen ion channel mutations, we recommend that each measurement or protocol be validated by initial comparison to manual recording. With this caveat, we suggest that, if results are interpreted cautiously, robotic patch-clamp can be used with supervision and subsequent confirmation from human physiologists to facilitate the initial profiling of a variety of electrophysiological parameters of ion channel mutations.
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Han JY, Choi JS, Chun JM, Park HD, Lee SY, Kim CH, Park Q, Nava-Ocampo AA, Koren G. Pregnancy outcome of women transfused during pregnancy with blood products inadvertently obtained from donors treated with acitretin. J OBSTET GYNAECOL 2010; 29:694-7. [PMID: 19821659 DOI: 10.3109/01443610903177128] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
We assessed the pregnancy outcome of nine women inadvertently transfused with acitretin-contaminated blood products in South Korea. A total of 18 women matched to cases by age, gravidity, and singleton- or twin-pregnancy, and who were transfused with blood products not contaminated with acitretin, was also recruited. There were nine babies born in the case group. No differences (p > 0.05) were observed between cases and controls in the gestational age at delivery (38.3 +/- 1.6 weeks vs 37.8 +/- 2.2 weeks), birth weight (3,146 +/- 874 g vs 3,106 +/- 568 g), rate of pre-term deliveries (22.2% vs 11.1%) and rate of low birth weight (<2,500 g) (33.3% vs 16.7%). There was no case of malformation or neurological abnormalities born in either group. In conclusion, inadvertent exposure to acitretin-contaminated blood products was not associated with adverse pregnancy outcomes, probably because of the removal of acitretin and etretinate during the manufacturing process of blood products.
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Choi JS, Hwang IR, Hong SH, Oh GT, Choi JA, Jeon SH, Kang SO, Yalishev VS, Park BH, Choi CH, Ahn CW, Nahm S, Ahn SJ. BaTiO3 doped Na0.5K0.5NbO3 thin films deposited by using eclipse shutter enhanced pulsed laser deposition method. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2009; 9:7354-7358. [PMID: 19908787 DOI: 10.1166/jnn.2009.1759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have investigated structural, electrical, and electro-mechanical properties of lead-free piezoelectric BaTiO3 doped Na0.5K0.5NbO3 (BTO-NKN) thin films deposited by pulsed laser deposition (PLD) methods. BTO-NKN thin films have been deposited on La0.5Sr0.5CoO3 (LSCO) bottom electrodes with LaAlO3 (LAO) substrates. X-ray diffraction data have shown that all the BTO-NKN and bottom electrodes are highly oriented with their c-axes normal to the substrates. In order to improve the morphology of BTO-NKN thin films, we have located an eclipse shutter between a target and a substrate. Root-mean-square roughness was changed from 91 nm to 21 nm with eclipse shutter enhanced PLD (E-PLD) method. Furthermore, the enhanced surface morphology leads to the improvement in electrical or electro-mechanical properties mainly due to increased density. Typical capacitance and d33 values of a BTO-NKN film deposited by E-PLD method are 1000 pF and 30 pmN, respectively.
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Shin SC, Li C, Choi JS. Effects of baicalein, an antioxidant, on the bioavailability of doxorubicin in rats: possible role of P-glycoprotein inhibition by baicalein. DIE PHARMAZIE 2009; 64:579-583. [PMID: 19827298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The purpose of this thesis is to investigate the effects of baicalein, an antioxidant, on the bioavailability and pharmacokinetics of Doxorubicin (DOX) in rats. Thus, DOX was administered intravenously (i.v.; 10 mg x kg(-1)) or orally (p.o.; 50 mg x kg(-1)) with or without oral baicalein (0.3, 1.5 and 6 mg x kg(-1)). In the presence of 1.5 and 6 mg x kg(-1) of baicalein, the total area under the plasma concentration-time curve from time zero to time infinity (AUC) and the peak concentration (Cmax) of DOX were significantly greater and higher, respectively, than those of the control. Consequently, the absolute bioavailability (AB) of DOX in the presence of baicalein was 3.5-4.4%, which was significantly enhanced compared with that of the control group (2.2%). The relative bioavailability (RB) of DOX was 1.20 to 1.96 times higher than that of the control group. Compared to the intravenous control, the presence of oral baicalein increased the i.v. AUC of DOX and other pharmacokinetic parameters were not significantly affected. The enhanced bioavailability of oral DOX by oral baicalein may be due to the inhibition of both P-glycoprotein (P-gp) and the cytochrome P450 (CYP) 3A subfamily by baicalein in the intestine and/or liver. This result suggests that the development of oral DOX is feasible by combination with baicalein that would be more convenient than the i.v. dosage forms. Furthermore, since the present study raises the awareness about potential drug interactions by concomitant use of DOX with baicalein, the dosage regimen of DOX should be taken into consideration, if this result is confirmed in clinical studies.
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Han JY, Yang JH, Chung JH, Choi JS, Ahn HK, Ryu HM, Kim MY, Cho SI, Nava-Ocampo AA. Teratogen risk counselling by internet: A prospective cohort study. J OBSTET GYNAECOL 2009; 25:427-31. [PMID: 16183573 DOI: 10.1080/01443610500160584] [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
Although the internet may play a role in providing proper teratogen-risk counselling for pregnant women, the experience with this type of service has not been reported. We aimed to compare the pregnancy outcome of women counselled by the internet to women that received typically in-clinic teratogen risk counselling in the clinic. In a prospective cohort design, 1,011 patients were counselled in the clinic and 235 patients were counselled via the internet. Teratogen risk counselling was provided according with the information obtained from medical literature and specialised software. Information about pregnancy outcome (delivery, spontaneous abortion, or termination of pregnancy and major malformations) was obtained from 903 (89.3%) patients from the clinic group and 141 (60%) from the internet group. The amount of alcohol, cigarettes smoked, and millirads of X-ray were greater ( p < 0.05) in patients counselled by internet than in clinic. The rate of deliveries, ongoing pregnancies, pregnancy terminations, and spontaneous abortions were similar between clinic and internet (chi2 = 1.32; p = 0.7). Of 498 babies born to mothers counselled in the clinic, major malformations were identified in 3.6%. Of 67 babies born to mothers counselled by internet, major malformations were present in 1.5% ( p = 0.6). Teratogen-risk counselling by internet and clinic seems to have a similar efficacy in pregnancy outcome.
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Cho YJ, Han JY, Choi JS, Ahn HK, Ryu HM, Kim MY, Yang JH, Nava-Ocampo AA, Koren G. Prenatal multivitamins containing folic acid do not decrease prevalence of depression among pregnant women. J OBSTET GYNAECOL 2009; 28:482-4. [PMID: 18850419 DOI: 10.1080/01443610802196658] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Several studies have reported an association between depression and folic acid deficiency. We investigated whether intake of prenatal multivitamins containing folic acid (MVandFA) was associated with decreased rates of depression among pregnant women. A questionnaire was given to 1,314 low-risk pregnant women. Of them, 1,277 (97.2%) women completed the questionnaire. The overall prevalence of depression was 8.1%. Of 652 participants who did not take MVandFA, 9.4% had depression, whereas 6.9% of 624 women who had MVandFA had depression (p = 0.11). In a multivariate logistic regression analysis, family history of depression (adjusted OR 3.7; 95% CI 1.9-7.3) and premenstrual syndrome (adjusted OR 3.0, 95% CI 1.8-4.8) were identified as risk factors for depression during pregnancy. In conclusion, intake of MVandFA was not associated with lower rates of depression during pregnancy whereas family history of depression and personal history of premenstrual syndrome were significant risk factors.
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Jung BY, Song YK, Choi JS, Lee KW, Ha TY, Yoon SS, Kweon CH, Park CK. Seroprevalence of leptospirosis in animals in Korea. Vet Rec 2008; 163:28-9. [PMID: 18603634 DOI: 10.1136/vr.163.1.28] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Li C, Choi JS. Effects of epigallocatechin gallate on the bioavailability and pharmacokinetics of diltiazem in rats. DIE PHARMAZIE 2008; 63:815-818. [PMID: 19069242] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This study investigated the effect of orally administered epigallocatechin gallate (EGCG), a flavonoid, on the bioavailability or pharmacokinetics of diltiazem and its main active metabolites desacetyldiltiazem in rats. Pharmacokinetic parameters of diltiazem and desacetyldiltiazem were determined following the oral administration of diltiazem (15 mg x kg(-1)) in the presence or absence of EGCG (1, 4 and 12 mg x kg(-1)). The area under the plasma concentration-time curve (AUC) and the peak concentration (Cmax) of diltiazem were significantly (P < 0.05, 4 mg x kg(-1) and P < 0.01, 12 mg x kg(-1)) increased in the presence of EGCG. The total body clearance (CL/F) was significantly (P < 0.05, 4 and 12 mg x kg(-1)) decreased in the presence of EGCG. Consequently, the absolute bioavailability (AB%) of diltiazem was significantly (P < 0.05, 4 mg x kg(-1) and P < 0.01, 12 mg x kg(-1)) increased compared with that of the control group. The relative bioavailability (RB%) of diltiazem was from 1.65- to 1.76-fold higher than that of the control group. The terminal half-life (t1/2) and time to reach the peak concentration (Tmax) of diltiazem did not change significantly in the presence of EGCG. EGCG significantly (P < 0.05, 12 mg x kg(-1)) increased the AUC and Cmax of desacetyldiltiazem. Metabolite-parent AUC ratio of desacetyldiltiazem was decreased, but did not change significantly. The presence of EGCG significantly enhanced the oral bioavailability of diltiazem due to inhibiting cytochrome P450 (CYP) 3A4-mediated metabolism and P-glycoprotein (P-gp) mediated efflux of diltiazem in the intestine.
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Ahn HK, Choi JS, Han JY, Kim MH, Chung JH, Ryu HM, Kim MY, Yang JH, Koong MK, Nava-Ocampo AA, Koren G. Pregnancy outcome after exposure to oral contraceptives during the periconceptional period. Hum Exp Toxicol 2008; 27:307-13. [PMID: 18684801 DOI: 10.1177/0960327108092290] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
To evaluate whether periconceptional exposure to oral contraceptives (OCs) increased adverse pregnancy outcomes, 136 pregnant women taking OCs within the periconceptional period were identified at the Korean Motherisk Program. Of them, 120 pregnant women accepted to participate in their study and were followed up until completion of the pregnancy. A control group of 240 age- and gravidity-matched pregnant women exposed to non-teratogen drugs for at least 1 month before pregnancy was also included. The median gestational age at delivery was 39.1 (27.0-41.0) weeks in the exposed group and 39.3 (27.4-42.0) weeks in the control group (P = 0.19). In the exposed group, 7.1% of babies were born with low birth weight versus 2.6% in the control group (P = 0.068). The number of preterm deliveries or babies born large for gestational age did not differ between the two groups. In the exposed group, the rate of birth defects was 3.2% (n = 3/99) versus 3.6% (n = 7/193) in the control group (P = 1.0). There were 15 women who took high doses of progesterone (emergency contraception) and no adverse fetal outcomes were observed. In conclusion, periconceptional exposure to OCs does not appear to increase the risk for adverse pregnancy outcomes.
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Park JS, Park DI, Park SK, Choi JS, Kim YH, Chang DK, Son HJ, Kim JE, Kim JO, Lee SH, Kim HS, Sin JE, Lee SG, Lee SY, Park SJ, Park CH, Baek IH, Jang BI, Jeen YT, Huh KC. Endoscopic evaluation of significant gastrointestinal lesions in patients with iron deficiency with and without anaemia: a Korean Association for the Study of Intestinal Disease study. Intern Med J 2008; 39:441-6. [PMID: 19220549 DOI: 10.1111/j.1445-5994.2008.01785.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Although endoscopy is recommended for patients with iron deficiency anaemia, there is, currently, no consensus on the role of endoscopy for iron-deficient patients without anaemia. The goal of this study was to determine the prevalence of serious gastrointestinal (GI) lesions, identified by endoscopy in patients with iron deficiency and anaemia compared with patients with iron deficiency without anaemia. METHODS One thousand five hundred and eighteen patients with a ferritin value of <or=50 ng/mL and a total iron-binding capacity >or=300 mg/dL were retrospectively investigated using oesophagogastroduodenoscopy and colonoscopy between January 2005 and September 2006. The lesions identified were classified as clinically important according to standard predetermined criteria. RESULTS Among the 1518 cases, 749 patients had anaemia and 769 had normal haemoglobin levels. Clinically important lesions were identified in 24.6% of the patients with anaemia and in 22.8% of the patients without anaemia (P > 0.05). The frequency of lower GI tract lesions (13.6 vs 11.4%, P > 0.05) and upper GI tract lesions (11.9 vs 12.5%, P > 0.05) was similar in the comparisons between the two groups. However, the frequency of malignant GI lesions was higher in the patients with anaemia (5.1 vs 0.7%, P < 0.01). In addition, the patients without anaemia were significantly more likely to have early-stage neoplasia (adenoma, early gastric cancer and Dukes' A and B colon cancer) than were the patients with anaemia (98.4 vs 52.5%, P < 0.01). CONCLUSION The results of this study suggest that patients with iron deficiency should undergo endoscopic evaluation of the GI tract, irrespective of whether they have anaemia. The endoscopic evaluation of the GI tract in patients with iron deficiency without anaemia could provide an opportunity for the detection of early-stage neoplasia at a curable stage.
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Lee JG, Choi SB, Kim KS, Choi JS, Lee WJ, Kim BR. Central bisectionectomy for centrally located hepatocellular carcinoma. Br J Surg 2008; 95:990-5. [PMID: 18574845 DOI: 10.1002/bjs.6130] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BACKGROUND Central bisectionectomy, which involves the removal of the central hepatic segments (IVA, IVB, V, VIII) for hepatocellular carcinoma (HCC), is performed to reduce the volume of resected liver and to overcome the problem of insufficient future residual volume. METHODS Twenty-seven patients with HCC underwent central bisectionectomy from January 1998 to April 2007 in one hospital. The surgical techniques, clinicopathological characteristics and outcomes were reviewed. RESULTS The median operating time was 330 min. Twelve patients developed postoperative complications and two died. The most common complication, occurring in five patients, was bile duct injury leading to biloma or bile leakage. Median follow-up was 19.1 (range 1.4-102.2) months and eight patients developed a recurrence. Twenty-four patients were alive at the time of writing. CONCLUSION Although biliary complications occur somewhat frequently, central bisectionectomy in centrally located HCC can be performed safely to preserve liver volume.
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Park BJ, Sung JH, Park JH, Choi JS, Choi HJ. Poly(vinyl acetate)/clay nanocomposite materials for organic thin film transistor application. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2008; 8:2676-2679. [PMID: 18572706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Nanocomposite materials of poly(vinyl acetate) (PVAc) and organoclay were fabricated, in order to be utilized as dielectric materials of the organic thin film transistor (OTFT). Spin coating condition of the nanocomposite solution was examined considering shear viscosity of the composite materials dissolved in chloroform. Intercalated structure of the PVAc/clay nanocomposites was characterized using both wide-angle X-ray diffraction and TEM. Fracture morphology of the composite film on silicon wafer was also observed by SEM. Dielectric constant (4.15) of the nanocomposite materials shows that the PVAc/clay nanocomposites are applicable for the gate dielectric materials.
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Choi JS, Han JY, Kim MY, Velázquez-Armenta EY, Nava-Ocampo AA. Pregnancy outcomes in women using inhaled fluticasone during pregnancy: a case series. Allergol Immunopathol (Madr) 2007; 35:239-42. [PMID: 18047814 DOI: 10.1157/13112989] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
BACKGROUND The aim of the study was to report the maternal and fetal outcomes of women with respiratory illnesses who were treated with inhaled fluticasone during pregnancy. MATERIAL AND METHODS We identified 12 cases treated with inhaled fluticasone during pregnancy out of women who received obstetric and teratogen-risk evaluation at the Korean Motherisk Program. A detailed medical and obstetric history was obtained and cases were followed-up until either spontaneous or voluntary pregnancy termination or delivery occurred. RESULTS None of the participants had any obstetric complication. However, in addition to fluticasone, most of the 12 cases were simultaneously exposed to a variety of medications. There were 3 abortions (one spontaneous and 2 requested by the patients arguing personal reasons). Live born babies without any evidence of major congenital malformations included 8 singleton babies and 2 twins. Of them, 3 babies were born prematurely. CONCLUSIONS Our results are in agreement with previous large studies where no increased rate of adverse outcomes was reported with the use of inhaled corticosteroids during pregnancy.
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Choi YL, Kim J, Kwon MJ, Choi JS, Kim TJ, Bae DS, Koh SS, In YH, Park YW, Kim SH, Ahn G, Shin YK. Expression profile of tight junction protein claudin 3 and claudin 4 in ovarian serous adenocarcinoma with prognostic correlation. Histol Histopathol 2007; 22:1185-95. [PMID: 17647191 DOI: 10.14670/hh-22.1185] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Tight junction proteins claudin 3 (CLDN3) and claudin 4 (CLDN4) are frequently altered in several human cancers, including ovarian carcinomas. Here, we examined the gene expression of CLDN3 and CLDN4 in various tumors, including 19 normal ovaries and 47 ovarian carcinomas by analyzing Affymetrix HG-U133 array data. Furthermore, a total of 114 ovarian serous tumors, including 10 adenomas, 20 borderline tumors and 84 carcinomas, were analyzed immunohistochemically to confirm the expression of two proteins and we assessed the association of their expression with the clinicopathological characteristics and survival of the patients. The microarray experiment revealed CLDN3 and CLDN4 transcripts were significantly up-regulated by 5-fold or more in most subtypes of ovarian epithelial carcinomas while the immunohistochemical analyses indicated that each protein was expressed in 68 (81.0%) and 72 (85.7%) of 84 serous adenocarcinomas, respectively. Borderline serous tumors and adenomas showed significantly lower expression of these proteins than the adenocarcinomas. Kaplan-Meier survival analysis showed that serous adenocarcinoma patients with high CLDN3 expression had substantially shorter survival (P=0.027). Multivariate analysis demonstrated that CLDN3 overexpression is an independent negative prognostic factor. Our findings suggest that CLDN3 overexpression can be used as a prognostic indicator in ovarian serous carcinomas. Moreover, CLDN3 may be a promising target for antibody-based therapy of ovarian carcinomas.
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MESH Headings
- Biomarkers, Tumor/metabolism
- Claudin-3
- Claudin-4
- Cystadenocarcinoma, Serous/genetics
- Cystadenocarcinoma, Serous/metabolism
- Cystadenocarcinoma, Serous/mortality
- Cystadenocarcinoma, Serous/pathology
- Cystadenoma, Serous/genetics
- Cystadenoma, Serous/metabolism
- Cystadenoma, Serous/mortality
- Cystadenoma, Serous/pathology
- Female
- Gene Expression Profiling
- Gene Expression Regulation, Neoplastic
- Humans
- Male
- Membrane Proteins/genetics
- Membrane Proteins/metabolism
- Ovarian Neoplasms/genetics
- Ovarian Neoplasms/metabolism
- Ovarian Neoplasms/mortality
- Ovarian Neoplasms/pathology
- Ovary/metabolism
- Ovary/pathology
- Prognosis
- RNA, Messenger/metabolism
- Retrospective Studies
- Survival Rate
- Tissue Array Analysis
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Kang CM, Choi GH, Park SH, Kim KS, Choi JS, Lee WJ, Kim BR. Laparoscopic cholecystectomy only could be an appropriate treatment for selected clinical R0 gallbladder carcinoma. Surg Endosc 2007; 21:1582-7. [PMID: 17479340 DOI: 10.1007/s00464-006-9133-4] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2006] [Revised: 08/19/2006] [Accepted: 10/09/2006] [Indexed: 12/18/2022]
Abstract
BACKGROUND Laparoscopic cholecystectomy (LC) for gallbladder carcinoma still is controversial except for the early stages of gallbladder carcinoma (Tis). This study was designed to evaluate and revisit the role of LC in treating gallbladder carcinoma. METHODS Available medical records of patients with surgeries for gallbladder carcinoma were retrospectively investigated from August 1992 to February 2005. RESULTS Among 219 patients treated for gallbladder carcinoma, 57 (26%) underwent LC. A total of 16 patients (28.1%) underwent subsequent radical cholecystectomy (LC-RC), and 41 (71.9%) were only followed up without radical surgery (LC). Tis was found in 11 patients (19.3%), T1a in 3 patients (5.3%), T1b in 8 patients (14%), T2 in 19 patients (33.3%), and T3 in 16 patients (28.1%). The findings showed R0 in 14 cases of the radical cholecystectomy group, and clinical R0 was noted in 30 cases of the LC-only group. No survival differences were noted between LC and LC-RC (p = 0.2575), especially in the case of T2 lesions (p = 0.6274), nor between the R0 and clinical R0 (p = 0.5839). However, significant survival differences were noted between the R2 and R0 groups, and between R2 and clinical R0, respectively (p < 0.001). CONCLUSIONS The findings show that LC could be appropriate treatment for gallbladder carcinoma only in selected cases of clinical R0 lesions.
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Park KS, Nam JH, Lee ES, Choi JS, Bang D, Lee S. Increased risk of human leukocyte antigen-G gene variants in Behçet's disease. Clin Exp Rheumatol 2006; 24:S126-7. [PMID: 17067446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
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Choi JS, Lee SH, Chung SJ, Yoo KH, Sung KW, Koo HH. Assessment of converting from intravenous to oral administration of cyclosporin A in pediatric allogeneic hematopoietic stem cell transplant recipients. Bone Marrow Transplant 2006; 38:29-35. [PMID: 16715103 DOI: 10.1038/sj.bmt.1705402] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We studied the administration method during a transition period from continuous intravenous (i.v.) infusion to oral administration of cyclosporin A (CsA). Thirty-two pediatric hematopoietic stem cell transplant (HSCT) recipients, between the ages of 8 months and 15.6 years (median 7.1 years) participated in this study. The pharmacokinetic properties of CsA was evaluated during the transition period from i.v. to oral CsA. The daily oral dose of CsA was three times higher than the i.v. dose. Oral dosing began immediately after the continuous infusion was discontinued. Whole-blood CsA concentrations were measured by a monoclonal fluorescence polarization immunoassay (FPIA). The mean+/-s.d. value of bioavailability (F), maximum concentration (C(max)), half-life (t(1/2)) of CsA were 43.1+/-14.4%, 1135.3+/-340.6 ng/ml and 3.1+/-1.2 h, respectively. Mean clearance (CL)+/-s.d. was 480.9+/-103.7, 414.9+/-137.1 and 320+/-51.8 ml/h/kg in patients <20, 20-40 and >40 kg of body weight, respectively. The CsA CL of younger children was significantly greater than for older children (P=0.044). CsA trough levels were maintained within the therapeutic range throughout the transition period. Therefore, our findings suggest that the immediate administration of an oral formulation, after discontinuation of the continuous infusion, would be practical and effective for routine clinical use.
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Kwon HJ, Hong YK, Kim KH, Han CH, Cho SH, Choi JS, Kim BW. Methanolic extract of Pterocarpus santalinus induces apoptosis in HeLa cells. JOURNAL OF ETHNOPHARMACOLOGY 2006; 105:229-34. [PMID: 16326057 DOI: 10.1016/j.jep.2005.10.025] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2005] [Revised: 10/25/2005] [Accepted: 10/26/2005] [Indexed: 05/05/2023]
Abstract
Ptercarpus santalinus (Fabaceae) has been used as a folk remedy in Korea, and it has been shown to exhibit antiinflammations, antiulcers and anticancer effects. In this study, therefore, we report the cytotoxic activity and the mechanism of cell death exhibited by the methanol extract of Ptercarpus santalinus (MEPS) against human cervical adenocarcinoma cell line, HeLa. Treatment of HeLa cells with various concentrations of MEPS resulted in growth inhibition and induction of apoptosis in a dose-dependent manner as determined by cell viability, chromatin condensation, DNA fragmentation and sub-G1 phase accumulation. In Western blot analysis, apoptosis in the HeLa cells was associated with the release of cytochrome C from mitochondria into the cytosol, activation of caspases-3, -8, -9 and proteolytic cleavage of PARP. These results suggest that MEPS exhibits antiproliferative effect on HeLa cells via apoptosis, and it may be a potential candidate in field of anticancer drug discovery.
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Hwang YH, Person B, Choi JS, Nam YS, Singh JJ, Weiss EG, Nogueras JJ, Wexner SD. Biofeedback therapy for rectal intussusception. Tech Coloproctol 2006; 10:11-5; discussion 15-6. [PMID: 16528489 DOI: 10.1007/s10151-006-0244-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2005] [Accepted: 08/24/2005] [Indexed: 12/24/2022]
Abstract
BACKGROUND Surgery for isolated internal rectal intussusception is controversial due to high morbidity. Therefore, there is interest in other forms of treatment that are safe and effective. The aim of this study was to determine outcome and identify predictors for success of biofeedback therapy in patients with rectal intussusception. METHODS We retrospectively evaluated the results of electromyography (EMG)-based biofeedback in 34 patients with rectal intussusception without any other major pelvic floor or colonic physiologic disorder. RESULTS A total of 34 patients (7 men) had undergone at least 2 biofeedback sessions. The patients had a mean age of 68.5 years (SD=11.4 years). In the 27 patients with constipation, the frequency of weekly spontaneous bowel movements (mean+/-SD) was 2.0+/-6.8 before and 4.1+/-4.6 after biofeedback (p<0.05). The frequency of weekly assisted bowel movements decreased from 3.8+/-3.5 before to 1.5+/-2.2 after therapy (p<0.005). The number of patients who experienced incomplete evacuation decreased from 17 (63%) to 9 (33%) (p<0.05). Thirty-three percent of patients had complete resolution of the symptoms, 19% had partial improvement, and 48% had no improvement. Patients with constipation lasting less than nine years had a 78% success rate vs. 13% in patients who were constipated more than 9 years (p<0.01). In seven patients with incontinence, the frequency of daily incontinence episodes decreased from 1.0+/-0.7 before to 0.07+/-0.06 after biofeedback (p<0.05). The fecal incontinence score decreased from 13.1+/-4.2 before to 4.6+/-3.6 after treatment (p<0.005). Two patients (29%) were completely continent following biofeedback, 2 had partial improvement, and 3 (43%) had no significant improvement. There was no mortality in either group. CONCLUSIONS Biofeedback is a safe and effective treatment option for constipation and fecal incontinence due to rectal intussusception in patients who are willing to complete the course of treatment. Long-standing constipation is less effectively cured by biofeedback.
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Son BH, Choi JS, Lee JH. Prognostic values of KAI1 and survivin expression in an infiltrating ductal carcinoma of the breast. Pathology 2005; 37:131-6. [PMID: 16028840 DOI: 10.1080/00313020500058144] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AIMS To investigate KAI1 and survivin expression in infiltrating ductal carcinomas, and to evaluate the relationship between clinicopathological factors and KAI1 and survivin expression levels in breast cancers. METHODS AND RESULTS KAI and survivin expression levels were measured in 62 patients, using immunohistochemical staining. Western blot analysis was performed on eight frozen cases. DNA ploidy was determined by flow cytometry. The results of the KAI1 expression analyses were as follows: in 14 cases (22.6%) levels were preserved (++), in 30 cases (48.4%) levels were reduced (+), in 18 cases (29.0%) no KAI1 expression was detected, so these were designated 'lost' (-). Results of assessments of survivin expression were as follows: six cases (9.7%) were strong positive (++), 28 cases (45.15%) were positive (+), and 28 cases (45.15%) were negative. Survivin (p=0.0009) and KAI1 (p=0.0091) expression levels were directly correlated with survival rate. However, no significant difference was determined to exist between survivin and KAI1 expression levels and the clinicopathological factors. DNA ploidy did not correlate with survivin and KAI1 expression levels and survival rate. Four different groups, according to their survivin and KAI1 expression levels, correlated with the clinical stage and survival rate. CONCLUSION KAI1 and survivin expression levels might be prognostic factors in breast cancers.
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MESH Headings
- Adult
- Aged
- Biomarkers, Tumor/metabolism
- Breast Neoplasms/diagnosis
- Breast Neoplasms/genetics
- Breast Neoplasms/metabolism
- Breast Neoplasms/mortality
- Carcinoma, Ductal, Breast/diagnosis
- Carcinoma, Ductal, Breast/genetics
- Carcinoma, Ductal, Breast/metabolism
- Carcinoma, Ductal, Breast/mortality
- DNA, Neoplasm/analysis
- Extracellular Matrix Proteins/genetics
- Extracellular Matrix Proteins/metabolism
- Female
- Gene Expression Regulation, Neoplastic
- Humans
- Immunohistochemistry
- Inhibitor of Apoptosis Proteins
- Microtubule-Associated Proteins/genetics
- Microtubule-Associated Proteins/metabolism
- Middle Aged
- Neoplasm Proteins
- Neoplasm Staging
- Nerve Tissue Proteins/genetics
- Nerve Tissue Proteins/metabolism
- Ploidies
- Prognosis
- Survival Rate
- Survivin
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Han B, Kim J, Kim Y, Choi JS, Makarov IE, Ponomarev AV. Electron beam treatment of textile dyeing wastewater: operation of pilot plant and industrial plant construction. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2005; 52:317-24. [PMID: 16459806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
A pilot plant for treating 1000 m3/day of dyeing wastewater with e-beam has been constructed and operated since 1998 in Daegu, Korea together with the biological treatment facility. The wastewater from various stages of the existing purification process has been treated with an electron beam in this plant, and it gave rise to elaborating the optimal technology of the electron beam treatment of wastewater with increased reliability for instant changes in the composition of wastewater. Installation of the e-beam pilot plant resulted in decolorizing and destructive oxidation of organic impurities in wastewater, appreciable reduction of chemical reagent consumption, in reduction of the treatment time, and in increase in the flow rate limit of existing facilities by 30-40%. Industrial plant for treating 10,000 m3/day each, based upon the pilot experimental result, is under construction and will be finished by 2005. This project is supported by the International Atomic Energy Agency (IAEA) and Korean Government.
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