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Jung MA, Yoon JY, Cho SH. Characteristics of Nutrient Intakes of Adults over 20 years in Daegu-Gyeongbuk - From the 1st to 3rd National Health and Nutrition Examination Surveys -. ACTA ACUST UNITED AC 2009. [DOI: 10.4163/kjn.2009.42.5.474] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Han DH, Kim SW, Cho SH, Kim DY, Lee CH, Kim SS, Rhee CS. Predictors of bronchial hyperresponsiveness in chronic rhinosinusitis with nasal polyp. Allergy 2009; 64:118-22. [PMID: 19120071 DOI: 10.1111/j.1398-9995.2008.01841.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Chronic rhinosinusitis with nasal polyposis (CRSNP) and asthma are inflammatory lesions of the respiratory epithelium. This study was conducted to evaluate predictive factors of bronchial hyperresponsiveness (BHR) in patients with CRSNP. METHODS BHR was evaluated using a methacholine bronchoprovocation test (MBPT) in 122 consecutive patients newly diagnosed with CRSNP at Seoul National University Hospital from January 2004 to June 2006. The following parameters were analyzed and compared between the BHR and non-BHR groups: symptoms, atopic status, current smoking, disease severity of CRSNP based on the Lund-Mackay scoring system of sinus CT, and counts of eosinophils in the serum and nasal tissues. RESULTS Thirty-five percent of the patients were found to have BHR, and BHR was found to occur more frequently in patients that were currently suffering from sneezing (P = 0.007). In addition, the mean eosinophil counts of the serum and nasal tissues were higher in the BHR group than in the non-BHR group (P = 0.001 for the serum, P = 0.045 for the nasal tissues), and the eosinophil counts of the serum correlated to those of the nasal tissues (r = 0.334, P = 0.013). The disease severity, as determined by the Lund-Mackay scoring system, was not different between the two groups (P > 0.05). The best cutoff serum eosinophil count for predicting BHR in CRSNP patients was determined to be 300 cells/microl (sensitivity 70%, specificity 70%). CONCLUSION Taken together, these results indicate that moderate to severe sneezing and a serum eosinophil count > or = 300 cells/microl may be predictive factors for BHR in patients with CRSNP.
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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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Kim TH, Chang HS, Park SM, Nam BY, Park JS, Rhim T, Park HS, Kim MK, Choi IS, Cho SH, Chung IY, Park BL, Park CS, Shin HD. Association of angiotensin I-converting enzyme gene polymorphisms with aspirin intolerance in asthmatics. Clin Exp Allergy 2008; 38:1727-37. [PMID: 18727619 DOI: 10.1111/j.1365-2222.2008.03082.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Aspirin-intolerant asthma (AIA) refers to the development of bronchoconstriction in asthmatic individuals following the ingestion of aspirin or other non-steroidal anti-inflammatory drugs (NSAIDs). Angiotensin I-converting enzyme (ACE), a membrane-bound peptidase present in the lung, plays a pivotal role in the metabolism of the endogenous peptides involved in the pathogenesis of asthma. METHODS We screened a Korean asthma cohort (581 asthmatics including 81 aspirin-intolerant asthmatics and 231 aspirin-tolerant asthmatics, and 181 normal controls) for four single nucleotide polymorphisms (SNPs; -262 A>T and -115 T>C in the 5'-flanking region and +5467 T>C [Pro450Pro] and+11860 A>G [Thr776Thr] in the coding region) and one ins/del (+21288 CT) in the ACE gene. RESULTS None of the SNPs or haplotypes showed any association with the development of asthma, but they were significantly associated with the risk of AIA. Logistic regression indicated that the frequency of the rare alleles of -262 A>T and -115 T>C was higher in subjects with AIA than in subjects with aspirin-tolerant asthma (ATA) (P=0.003-0.01, P( corr)=0.015-0.05). Subjects homozygous for the rare alleles of -262 A>T and -115 T>C showed a greater decline in forced expiratory volume in 1 s (FEV(1)) after aspirin provocation than those homozygous for the common alleles (P<0.05). A luciferase reporter assay indicated that ACE promoters containing the rare -262 A>T allele possessed lower activity than did those containing the common allele (P=0.009). In addition, ACE promoters bearing the rare -115 T>C allele had no luciferase activity. DNA-protein binding assays revealed a band containing the ACE promoter region (including -262 A) and a protein complex. CONCLUSION The -262 A>T polymorphism in the promoter of the ACE gene is associated with AIA, and the rare allele of -262 A>T may confer aspirin hypersensitivity via the down-regulation of ACE expression.
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Kim MH, Yi CH, Kwon OY, Cho SH, Yoo WG. Changes in neck muscle electromyography and forward head posture of children when carrying schoolbags. ERGONOMICS 2008; 51:890-901. [PMID: 18484402 DOI: 10.1080/00140130701852747] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
This study tested the effects of three alternative types of backpack on head posture and neck muscle electromyography (EMG) in children. Four loading conditions were tested: no pack; a backpack; a double pack; a modified double pack (designed with a backpack and a front pack weighing 10% and 5% of body weight, respectively). Dependent variables were neck muscle activity, forward head angle and forward head distance (the perpendicular distance from C7 to a vertical line through the tragus of the ear). Fifteen children were asked to walk at a speed of 0.8 m/s on a treadmill. The EMG activity of upper trapezius, sternocleidomastoid and midcervical paraspinals muscles and the forward head angle and forward head distance were all significantly higher when carrying a backpack than for the other conditions. When carrying a double pack, there was a backward head posture characterised by an increased negative forward head angle, decreased forward head distance, increased sternocleidomastoid EMG signal and decreased midcervical paraspinals EMG signal, compared to carrying no pack. When carrying a modified double pack, the forward head angle and forward head distance decreased when compared to carrying a backpack. These findings indicate that the modified double pack minimises postural deviation.
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Jang JH, Yoon JY, Cho SH. Intake of dietary phytoestrogen and indices of antioxidant and bone metabolism of pre- and post-menopausal Korean women. Nutr Res Pract 2007; 1:305-12. [PMID: 20368955 PMCID: PMC2849039 DOI: 10.4162/nrp.2007.1.4.305] [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: 09/30/2007] [Revised: 10/06/2007] [Accepted: 10/19/2007] [Indexed: 11/17/2022] Open
Abstract
A group of 101 women, aged 40-65 years consisted of 48 premenopausal subjects and 53 postmenopausal ones living in Daegu and Gyeongbuk area in Korea were evaluated with their general characteristics, lifestyle factors, nutrient and phytoestrogen intakes, blood and urinary indices concerning antioxidant status and bone metabolism. Body mass index (BMI), waist hip ratio (WHR) and systolic blood pressure (SBP) of the postmenopausal women were significantly higher (23.8, 0.86, and 126.9 mmHg, respectively) than those of the premenopausal women (22.6, 0.82, and 115.9 mmHg; respectively). Nutrient intakes of the postmenopausal and premenopausal groups were not different except lower fat intake and higher dietary fiber and iron intakes in the postmenopausal group. Daily total phytoestrogen intake was significantly higher in the postmenopausal group (48.54 mg) than the premenopausal (31.41 mg) and was resulted mostly from higher intakes of daidzein and genistein from soy and soy products (45.42 mg vs 28.91 mg). Serum genistein level and excretion of enterolactone, major lignan metabolite, were not very different between the two groups. Serum retinal and α- tocopherol levels were higher in the postmenopausal group but TBARS levels were not different between the two groups. Serum osteocalcin (7.18 ng/mL) and urinary deoxypyridinoline (7.15 nmol/mmol creatinine), in the postmenopausal group were significantly higher than those in the premenopausal group (4.80 ng/mL, 5.95 nmol/mmol creatinine). Urinary excretion of enterolactone was positively correlated with serum osetocalcin in premenopausal women and serum genistein negatively correlated with the urinary DPD in postmenopausal women. Dietary phytoestrogen intake was negatively correlated with serum level of TBARS in all subjects. It is concluded that the effect of total phytoestrogen intake is beneficial on body antioxidant status in all middle-aged women regardless of menopause but the effect on bone metabolism appears different by the type of the phytoestrogen and the menopausal state.
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Sung HY, Kim JI, Cheung DY, Cho SH, Park SH, Han JY, Kim JK, Han SW, Choi KY, Chung IS. Successful endoscopic hemoclipping of an esophageal perforation. Dis Esophagus 2007; 20:449-52. [PMID: 17760661 DOI: 10.1111/j.1442-2050.2007.00702.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We describe a case of esophageal perforation that resulted from a fishbone. A 71-year-old man had had a fishbone impacted in the lower esophagus for 2 days. At presentation, the bone was dislodged at endoscopy; one round opening in a deep ulceration was detected when the fishbone was removed. The perforation was closed by endoscopic hemoclipping, after the removal of the fishbone. A thoracic computed tomography revealed air around the esophagus, aorta and bronchus and the presence of a pleural effusion. These findings suggested mediastinal emphysema and mediastinitis due to the esophageal perforation after the removal of the fishbone. Esophagography revealed a focal esophageal defect and linear contrast leakage at the distal esophagus. The mediastinal emphysema and pleural effusion successfully resolved after the endoscopic hemoclip application and conservative management of the perforation.
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Jang JW, Choi JY, Bae SH, Kim CW, Cho SH, Yoon SK, Yang JM, Han JY, Lee YS, Kim DG. The best candidates for transarterial chemotherapy in patients with hepatocellular carcinoma awaiting liver transplantation: a cohort-based characterization of dropout times. Aliment Pharmacol Ther 2007; 26:87-94. [PMID: 17555425 DOI: 10.1111/j.1365-2036.2007.03345.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
BACKGROUND Although transarterial chemotherapy is used to retard tumour progression for hepatocellular carcinoma (HCC) patients awaiting orthotopic liver transplantation (OLT), information regarding the acceptable waiting time and appropriate patient selection for the therapy is lacking. AIM To examine dropout times and determine the best candidates for pre-transplant transarterial therapy in a cohort study. METHODS In total, 180 consecutive HCC candidates receiving pre-transplant chemo-lipiodolization were included in the study. RESULTS Overall, 70 (38.9%) patients dropped off the waiting list during the median follow-up of 19 months. According to the Child-Pugh (C-P) classification, the estimated dropout rates at 1 and 2 years were 17.2% and 44.8% for the C-P A group and 33.4% and 81.3% for the C-P B/C group, respectively. C-P B/C patients experienced more frequent dropouts than C-P A patients (P < 0.001). Risk factor analysis identified C-P classification to be the strongest predictor of dropout (P < 0.001). On multivariate analysis, alpha-fetoprotein (AFP) >100 ng/mL, tumour size >3 cm and multiple nodules remained independently predictive of dropout for C-P A group (all P < 0.05). Candidates with none of these factors were found to be at the lowest risk of dropout, with only a 22.5% dropout rate up to 41 months. CONCLUSIONS This study suggests that Child-Pugh A patients with one nodule <3 cm and AFP < 100 ng/mL may be the best candidates for pre-transplant chemo-lipiodolization, with the lowest dropout rate. However, comparative studies with other therapeutic options are needed to assess the definitive role of transarterial therapy in this setting.
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Han Y, Shin EH, Yoon MK, Lee SB, Ju SG, Lim CI, Park SH, Kang SK, Lah JE, Cho SH, Ibbott G, Ahn YC. SU-FF-T-186: Dosimetry in An IMRT Phantom Designed for a Remote Auditing Program. Med Phys 2007. [DOI: 10.1118/1.2760846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Kim SS, Im HT, Kang IM, Lee HS, Lee HW, Cho SH, Kim JB, Lee KT. An optimized analytical method of fluconazole in human plasma by high-performance liquid chromatography with ultraviolet detection and its application to a bioequivalence study. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 852:174-9. [PMID: 17275423 DOI: 10.1016/j.jchromb.2007.01.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2006] [Revised: 12/26/2006] [Accepted: 01/09/2007] [Indexed: 11/20/2022]
Abstract
A sensitive and accurate HPLC-UV method for the quantification of fluconazole (FLA) level in human plasma has been developed. The sample was prepared by one-step liquid-liquid extraction (LLE) of FLA from plasma using dichloromethane. Phenacetin was used as the internal standard. The chromatographic retention times of FLA and phenacetin were 4.6 and 8.3 min, respectively. The lower limit of quantitation (LLOQ) was 0.05 microg/mL, and no interferences were detected in the chromatograms. The devised HPLC-UV method was validated by evaluating its intra- and inter-day precisions and accuracies in a linear concentration range between 0.05 and 10.00 microg/mL. The devised method was successfully applied to a bioequivalence studies involving the oral administration of a single 150 mg FLA tablet and 3 x 50 mg FLA capsules in healthy Korean male volunteers.
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Cho SH, Jung BH, Lee WY, Chung BC. Rapid column-switching liquid chromatography/mass spectrometric assay for DHEA-sulfate in the plasma of patients with Alzheimer's disease. Biomed Chromatogr 2007; 20:1093-7. [PMID: 16583455 DOI: 10.1002/bmc.647] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A simple and highly sensitive method for the quantification of dehydroepiandrosterone-3-sulfate (DHEAS) in human plasma was developed. DHEAS was directly determined in plasma using column-switching liquid chromatography/mass spectrometry (LC-MS). The plasma was filtered with a membrane filter. The filtrate was injected onto a pre-column without further sample preparation such as extraction or derivatization. The pre-column was washed with an aqueous solution to remove interference and the analyte was eluted into a reversed-phase C(18) analytical column for separation and detection using a column-switching valve. The calibration range of DHEAS was 0.01-10 micromol/L, and the linearity of the method was 0.999. The limit of detection (LOD) at a signal-to-noise (S/N) ratio of 3 was 5 nmol/L. The accuracy and precision (%CV) were less than 10% in within-day and day-to-day variations. To explore the relationship between Alzheimer's disease and the DHEAS level in human plasma, the concentrations of DHEAS in female patients with Alzheimer's disease (n = 20) and in normal female subjects (n = 20) were measured. The level of DHEAS was significantly decreased in the plasma of patients with Alzheimer's disease (p < 0.0002) compared with that in normal subjects. From the results, we concluded that our method is sufficiently sensitivity and reliability for the quantification of DHEAS in clinical samples. Plasma DHEAS concentration could be an important marker to understand the pathogenesis of Alzheimer's disease.
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Lee HW, Park WS, Cho SH, Kim MH, Seo JH, Kim YW, Kim SS, Lee YS, Lee KT. A liquid chromatography/positive ion tandem mass spectrometry method for the determination of cilazapril and cilazaprilat in human plasma. Talanta 2007; 71:62-7. [DOI: 10.1016/j.talanta.2006.03.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2006] [Revised: 03/06/2006] [Accepted: 03/06/2006] [Indexed: 10/24/2022]
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Kim JH, Lee KH, Song JH, Ha EH, Leem JH, Cho SH, Hong YC. Dietary Zinc Protects Against Increases of MDA and r-GTP by Lead: Biological Monitoring for Environmental Surveillance. Epidemiology 2006. [DOI: 10.1097/00001648-200611001-00784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kim CM, Oh YJ, Cho SH, Chung DJ, Hwang JY, Park KH, Cho DJ, Choi YM, Lee BS. Increased telomerase activity and human telomerase reverse transcriptase mRNA expression in the endometrium of patients with endometriosis. Hum Reprod 2006; 22:843-9. [PMID: 17077107 DOI: 10.1093/humrep/del425] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Endometriosis is considered a frequent, benign disease with the ability to undergo neoplastic processes. The aim of this study was to evaluate the limitless replication potential of the endometrium in patients with endometriosis by examining human telomerase reverse transcriptase (hTERT) mRNA expression and telomerase activity. METHODS Endometrium samples from 30 endometriosis patients and 30 patients without endometriosis were obtained via endometrial biopsy. The expression of hTERT mRNA was determined by real-time RT-PCR assay, and telomerase activity was measured by telomerase repeat amplification protocol (TRAP) assay. RESULTS The mean normalized hTERT (N hTERT) mRNA level was significantly higher in the endometriosis than in the control group (P = 0.013). The mean hTERT mRNA levels during the proliferative phase and during the secretory phase were higher in the endometriosis group than in the control group, although the difference was only significant for the secretory phase (P = 0.036). We found a prominent difference in endometrial telomerase activity between moderate-to-severe endometriosis and the control group (P = 0.048). The levels of hTERT mRNA and telomerase activity increased as the disease became more severe (P = 0.038, P = 0.016). CONCLUSIONS This study showed the overexpression of hTERT mRNA and telomerase activity in the endometrium of endometriosis patients. These finding suggest that replication potential of endometrial cells may have an important role in the pathogenesis of endometriosis.
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Choi HJ, Ku JK, Kim MY, Kang H, Cho SH, Kim HO, Park YM. Possible role of Fas/Fas ligand-mediated apoptosis in the pathogenesis of fixed drug eruption. Br J Dermatol 2006; 154:419-25. [PMID: 16445769 DOI: 10.1111/j.1365-2133.2005.07057.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Although epidermal and dermal T cells play roles in the pathogenesis of fixed drug eruption (FDE), not much is known about keratinocyte death and its precise mechanism in FDE. OBJECTIVES Our aim is to elucidate the mechanism that underlies keratinocyte death in FDE, that is, the role of apoptosis and its signalling pathway. METHODS We first examined the involvement of apoptosis in the active FDE lesions by terminal deoxynucleotidyl transferase-mediated deoxyuridine triphosphate nick end-labelling (TUNEL) assay and immunohistochemical analysis of caspase-3. We then examined the expressions of Fas and Fas ligand (FasL) to deduce the possible upstream signalling pathway of apoptosis, if apoptosis were involved. We finally characterized the infiltrated T-cell subpopulations in the active FDE lesions. RESULTS In the active FDE lesions, TUNEL positivity was strongly observed in the basal keratinocytes, and also weakly observed in the upper dermal infiltrates as well as in a few keratinocytes in the granular layer. The distribution of TUNEL-positive cells was similar to that of the strong staining of active capase-3. Fas was found mainly in the keratinocytes and some infiltrated dermal cells, whereas FasL was identified predominantly in the intraepidermal and dermal infiltrated cells and in some basal keratinocytes. Overlapping expression of Fas and FasL was accompanied by apoptosis in the FDE lesions. Many of the infiltrated mononuclear cells were CD8+. Perforin was rarely observed in the FDE lesions. CONCLUSIONS These findings suggest that apoptosis of the keratinocyte is highly likely to be involved in the pathogenesis of FDE, and this cytotoxicity might be predominantly mediated by the FasL of the infiltrating CD8+ T cells, possibly also playing an inflammatory role.
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Lee HW, Park WS, Kim YW, Cho SH, Kim SS, Seo JH, Lee KT. A rapid and sensitive liquid chromatography/positive ion tandem mass spectrometry method for the determination of cimetropium in human plasma by liquid-liquid extraction. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:855-60. [PMID: 16810649 DOI: 10.1002/jms.1043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
We have developed and validated a simple detection system with high-performance liquid chromatography (HPLC) with positive ion electrospray ionization tandem mass spectrometry (ESI-MS/MS) for determining cimetropium levels in human plasma using scopolamine butyl bromide as an internal standard (I.S.). The acquisition was performed in the multiple reaction monitoring (MRM) mode, by monitoring the transitions: m/z 357.9 > 103.1 for cimetropium and m/z 359.9 > 103.1 for butyl-scopolamine. The method involves a simple single-step liquid-liquid extraction with dichloromethane. The analyte was chromatographed on an YMC C18 reversed-phase chromatographic column by isocratic elution with 10 mM ammonium formate buffer-methanol (19:81, v/v; adjusted to pH 4.0 with formic acid). The results were linear over the studied range (0.2-100 ng ml(-1)), with r2 = 1.0000, and the total analysis time for each run was 2 min. Intra- and interassay precisions were 0.70-8.54% and 1.08-4.85%, respectively, and intra- and interassay accuracies were 97.56-108.23% and 97.48-103.91%, respectively. The lower limit of quantification (LLOQ) was 0.2 ng ml(-1). At this concentration, mean intra- and interassay precisions were 8.54% and 4.85%, respectively, and mean intra- and interassay accuracies were 97.56% and 98.91%, respectively. The mean recovery ranged from 62.71 +/- 4.06 to 64.23 +/- 2.32%. Cimetropium was found to be stable in plasma samples under typical storage and processing conditions. The devised assay was successfully applied to a pharmacokinetic study of cimetropium bromide administered as a single oral dose (150 mg) to healthy volunteers.
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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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Kang HR, Yim EY, Oh SY, Chang YS, Kim YK, Cho SH, Min KU, Kim YY. Normal C1 inhibitor mRNA expression level in type I hereditary angioedema patients: newly found C1 inhibitor gene mutations. Allergy 2006; 61:260-4. [PMID: 16409206 DOI: 10.1111/j.1398-9995.2006.01010.x] [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: 11/29/2022]
Abstract
BACKGROUND C1 esterase inhibitor (C1INH) plays a key role in the classical pathway of the complement cascade. Mutations in this gene cause a decreased level of antigenic (type I hereditary angioedema, HAE) or functional (type II HAE) C1INH. OBJECTIVE To find novel mutations in C1INH and evaluate the expression of C1INH gene in HAE patients. METHODS Direct sequencing mutation analysis was performed for genomic DNA from three unrelated families (14 HAE patients and 18 family members). Genomic DNA from one family was also analyzed for larger genomic rearrangements, using Southern blotting analysis. We used real-time quantitative polymerase chain reaction (PCR) to evaluate C1INH mRNA expression level. RESULTS Four mutations in exons (2,311 T-->C, 14,034 G-->A, 16,830 G-->A, and 16,979-16,980 G insertion) and four in introns (738 G-->A, 8,531 A-->G, 14,254 A-->G, and 14,337-14,378 TT deletion) were found. Interestingly, all of the nine patients in one family share the same mutation of Gly345Arg (14,034 G-->A) in the seventh exon. In another family, a single base mutation near the splice site (14,254 A-->G) was found in all of the three patients. In the last family, although a significant mutation was not found by direct sequencing, patients showed an abnormal 16 kb fragment in addition to the normal allele (21 kb Bcl I fragment). The C1INH mRNA expression of HAE patients in two families was not significantly different compared with that of normal controls. CONCLUSION The two novel exonal mutations (G-->A and A-->G) and one large gene deletion were associated with the clinical phenotypes of HAE. Considering the normal C1INH mRNA levels but below normal protein levels in two families, their phenotypes would be associated with the post-translational defect.
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Cho SH, Jung BH, Lee SH, Lee WY, Kong G, Chung BC. Direct determination of nucleosides in the urine of patients with breast cancer using column-switching liquid chromatography–tandem mass spectrometry. Biomed Chromatogr 2006; 20:1229-36. [PMID: 16799933 DOI: 10.1002/bmc.689] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
We developed an analytical method for a simple, sensitive and simultaneous determination of oxidized nucleosides in urine using column-switching liquid chromatography-electrospray/tandem mass spectrometry (LC-ESI/MS/MS). We connected two columns through a six-way switching valve and effectively separated nucleosides in the urine from the interference by column-switching liquid chromatography. We monitored separated nucleosides using positive ionization tandem mass spectrometry in selective reaction monitoring (SRM) mode. The calibration ranges of nucleosides were 0.2-100 nmol/mL. The linearity of the method was 0.994-0.999, and the limits-of-detection (LOD) at a signal-to-noise (S/N) ratio of 3 were 0.1-0.2 nmol/mL. The coefficients of variation were in the range 2.28-11.74% for within-day variation and 4.36-11.15% for day-to-day variation, respectively. To explore the relationship between breast cancer and the nucleosides level in human urine, we measured the concentrations of nucleosides in female patients with breast cancer (n = 30) and in normal female subjects (n = 30). The concentration of nucleosides was significantly increased in patients with breast cancer when compared with the normal controls (1-methyladenosine; p < 0.005, N(2),N(2)-dimethylguanosine; p < 0.01, 5-hydroxymethyl-2'-deoxyuridine; p < 0.001, 8-hydroxy-2-deoxyguanosine; p < 0.001). Therefore, the elevated levels of nucleosides could be used as an important biomarker for breast-cancer research.
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Jang MJ, Rhee SJ, Cho SH, Woo MH, Choi JH. A Study on the Antioxidative, Anti-inflammatory and Anti-thrombogenic Effects of Zanthoxylum piperitum DC. Extract. ACTA ACUST UNITED AC 2006. [DOI: 10.3746/jkfn.2006.35.1.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Cho SH, Lee HW, Im HT, Park WS, Choi YW, Rew JH, Lee KT. Rapid and highly sensitive liquid chromatography/electrospray ionization tandem mass spectrometry method for the quantitation of buspirone in human plasma: application to a pharmacokinetic study. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:1293-8. [PMID: 16548054 DOI: 10.1002/rcm.2441] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
A rapid and sensitive method for the quantitation of buspirone in human plasma by liquid chromatography/electrospray ionization tandem mass spectrometry (LC/ESI-MS/MS) was developed. Plasma samples were treated by liquid-liquid extraction with methyl tert-butyl ether (MTBE). The chromatographic separation was performed isocratically on a reversed-phase Shiseido C18 column (50 mm x 2.0 mm, 3 microm) with a mobile phase of acetonitrile/0.1% acetic acid (1:1, v/v). The acquisition was performed in multiple reaction monitoring (MRM) mode, monitoring the transitions m/z 386 --> 122 for buspirone and m/z 409 --> 238 for amlodipine (the internal standard). The method was validated to determine its specificity, recovery, limit of quantitation, accuracy and precision. The lower limit of quantitation was 0.02 ng/mL with a relative standard deviation of less than 10%. The present method provides an accurate, precise and sensitive tool for buspirone and was successfully applied to a pharmacokinetic study in eight subjects.
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Cho SH, Lee J, Lee WY, Chung BC. Direct determination of acylcarnitines in amniotic fluid by column-switching liquid chromatography with electrospray tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:1741-6. [PMID: 16676311 DOI: 10.1002/rcm.2504] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
A direct, simple, and simultaneous determination of acylcarnitines in amniotic fluid was developed using column-switching liquid chromatography/tandem mass spectrometry (LC/MS/MS). The analytes can be assayed within 20 min without any sample preparation process, and we monitored separated acylcarnitines with positive electrospray ionization (ESI)-MS/MS. The calibration ranges of acylcarnitines were 1 to 100 nmol/L. The linearity of the method was 0.992 to 0.999, and the limits of detection at a signal-to-noise ratio of 3 were 1 nmol/L. The coefficients of variation were in the range of 5.2 to 13.3% for within-day variation and 6.7 to 11.9% for day-to-day, respectively. We detected acylcarnitines in the amniotic fluid of 22 women in the early stages of their pregnancies in the range of 2.2 to 17.2 nmol/L. The proposed method could be applied to diagnosis, monitoring, and biomedical investigations of inborn errors of the organic acid and fatty acid metabolism of the embryo.
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Cho SH, Jung BH, Lee WY, Chung BC. Direct determination of estriol conjugates in amniotic fluid by capillary electrophoresis with electrospray tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2006; 20:2995-8. [PMID: 16952215 DOI: 10.1002/rcm.2685] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
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Jaki BU, Franzblau SG, Cho SH, Pauli GF. Development of an extraction method for mycobacterial metabolome analysis. J Pharm Biomed Anal 2005; 41:196-200. [PMID: 16314064 PMCID: PMC3384498 DOI: 10.1016/j.jpba.2005.10.022] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2005] [Revised: 10/13/2005] [Accepted: 10/13/2005] [Indexed: 11/23/2022]
Abstract
As a prerequisite for studying the intracellular metabolome of mycobacteria, several methods were evaluated for efficient breakage of the cell using Mycobacterium bovis (BCG) as a model microorganism. Several pulping methods, treating with an Ultra-Turax, deep-freezing in liquid nitrogen followed by mechanical grinding, sonicating with probe head or cup horn and bead beating prior to solvent extraction were applied and compared. Gravimetry, electron microscopy, and nuclear magnetic resonance spectrometry were used to analyze the extracts. All analytical methods prove that sonicating is superior to mechanical grinding of deep-frozen cells. Two methods indicated that sonicating with a probe head enhances the efficiency of cell disruption compared to sonicating with a cup horn. The highest extract yield and chemical diversity were achieved by a combination of mechanical grinding and sonicating. Within the scope of a metabolomic analysis, the method of choice to treat mycobacterial cells is a combination of deep-freezing in liquid nitrogen and mechanical grinding followed by sonicating with a probe head.
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