1
|
Singh G, Kaur M, Shiekh BA, Kang TS. Luminescent micellar nano-interfaces of surface active ionic liquid for the selective recognition of ADP in aqueous medium. Chem Commun (Camb) 2018; 54:7463-7466. [DOI: 10.1039/c8cc02985g] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Selective recognition of ADP by the micellar nano-interfaces of SAIL is observed whereas monomers/bilayers are not sensitive towards ADP.
Collapse
Affiliation(s)
- G. Singh
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
| | - M. Kaur
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
| | - B. A. Shiekh
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
| | - T. S. Kang
- Department of Chemistry
- Department of Chemistry, University Grants Commission (UGC) Centre for Advanced Studies-II
- Guru Nanak Dev University
- Amritsar-143005
- India
| |
Collapse
|
2
|
Lee YJ, Seo JA, Yoon T, Seo I, Lee JH, Im D, Lee JH, Bahn KN, Ham HS, Jeong SA, Kang TS, Ahn JH, Kim DH, Nam GE, Kim NH. Effects of low-fat milk consumption on metabolic and atherogenic biomarkers in Korean adults with the metabolic syndrome: a randomised controlled trial. J Hum Nutr Diet 2016; 29:477-86. [DOI: 10.1111/jhn.12349] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Y. J. Lee
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - J. A. Seo
- Department of Endocrinology, Diabetes and Metabolism; Korea University Ansan Hospital; College of Medicine; Korea University; Ansan-si Korea
| | - T. Yoon
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - I. Seo
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - J. H. Lee
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - D. Im
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - J. H. Lee
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - K.-N. Bahn
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - H. S. Ham
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - S. A. Jeong
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - T. S. Kang
- Nutrition and Functional Food Research Team; National Institute of Food and Drug Safety Evaluation; Chungcheongbuk-do Korea
| | - J. H. Ahn
- Department of Endocrinology, Diabetes and Metabolism; Korea University Ansan Hospital; College of Medicine; Korea University; Ansan-si Korea
| | - D. H. Kim
- Department of Family Medicine; Korea University Ansan Hospital; College of Medicine; Korea University; Ansan-si Korea
| | - G. E. Nam
- Department of Family Medicine; Korea University Ansan Hospital; College of Medicine; Korea University; Ansan-si Korea
| | - N. H. Kim
- Department of Endocrinology, Diabetes and Metabolism; Korea University Ansan Hospital; College of Medicine; Korea University; Ansan-si Korea
| |
Collapse
|
3
|
Kim DS, Kang C, Kim DH, Kim SC, Lee SH, Jeong JH, Kang TS, Jung SM, Lee SB, Lee KW, Kim RB. External validation of the prognostic index in acute paraquat poisoning. Hum Exp Toxicol 2015; 35:366-70. [PMID: 25977258 DOI: 10.1177/0960327115586821] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
OBJECTIVE Some studies have evaluated the prognostic indicators associated with acute paraquat (PQ) poisoning. In this study, we externally validated the Yamaguchi index, which showed a good prognostic relevance in predicting the outcome of PQ poisoning. METHODS A retrospective analysis of 297 patients was performed. The Yamaguchi index was calculated using the following equation: Eq1 = (K(+) × HCO3(-))/(Creatinine × 0.088)(mEq/L) against time from PQ ingestion (T). The patients were divided into three groups: group A: Eq1 > 1500 - 399 × log T, group B: 930 - 399 × log T < Eq1 ≤ 1500 - 399 × log T, and group C: Eq1 ≤ 930 - 399 × log T). RESULTS The overall mortality rate was 65.3% (194 of 297). The mortality rates of the three groups stratified by the Yamaguchi index were 7.1% (2 of 28), 22.4% (15 of 67), and 87.6% (177 of 202). The area under the receiver-operating characteristic curve for predicting mortality from the external validation of the Yamaguchi index was 0.842 (95% confidence interval: 0.795-0.882). CONCLUSION The Yamaguchi index is a reliable prognostic factor and could be helpful in predicting mortality due to PQ poisoning.
Collapse
Affiliation(s)
- D S Kim
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - C Kang
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea Gyeongsang Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - D H Kim
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - S C Kim
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea Gyeongsang Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - S H Lee
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea Gyeongsang Institute of Health Sciences, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - J H Jeong
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - T S Kang
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - S M Jung
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - S B Lee
- Department of Emergency Medicine, Gyeongsang National University School of Medicine, Jinju, Republic of Korea
| | - K W Lee
- Department of Emergency Medicine, Catholic University of Daegu, Daegu, Republic of Korea
| | - R B Kim
- Department of Preventive Medicine, Dong-A University, Busan, Republic of Korea
| |
Collapse
|
4
|
Chen W, Carvalho LPD, Chan MY, Kini RM, Kang TS. Fasxiator, a novel factor XIa inhibitor from snake venom, and its site-specific mutagenesis to improve potency and selectivity. J Thromb Haemost 2015; 13:248-61. [PMID: 25418421 DOI: 10.1111/jth.12797] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2014] [Accepted: 11/11/2014] [Indexed: 02/03/2023]
Abstract
BACKGROUND Bleeding remains a major limitation of standard anticoagulant drugs that target the extrinsic and common coagulation pathways. Recently, intrinsic coagulation factors are increasingly being investigated as alternative targets for developing anticoagulant drugs with lower bleeding risk. OBJECTIVES Goals were to (i) identify novel anticoagulants selectively targeting intrinsic coagulation pathway and (ii) characterize and further improve the properties of the identified anticoagulants. METHODS AND RESULTS We have isolated and sequenced a specific factor XIa (FXIa) inhibitor, henceforth named Fasxiator, from the venom of the banded krait snake, Bungarus fasciatus. It is a Kunitz-type protease inhibitor that prolonged activated partial thromboplastin time without significant effects on prothrombin time. Fasxiator was recombinantly expressed (rFasxiator), purified, and characterized to be a slow-type inhibitor of FXIa that exerts its anticoagulant activities (doubled activated partial thromboplastin time at ~ 3 μmol L(-1) ) by selectively inhibiting human FXIa in in vitro assays. A series of mutants were subsequently generated to improve the potency and selectivity of recombinant rFasxiator. rFasxiatorN17R,L19E showed the best balance between potency (IC50 ~ 1 nmol L(-1) ) and selectivity (> 100 times). rFasxiatorN17R,L19E is a competitive slow-type inhibitor of FXIa (Ki = 0.86 nmol L(-1) ), possesses anticoagulant activity that is ~ 10 times stronger in human plasma than in murine plasma, and prolonged the occlusion time of mice carotid artery in FeCl3 -induced thrombosis models. CONCLUSION We have isolated an exogenous FXIa specific inhibitor, engineered it to improve its potency by ~ 1000 times and demonstrated its in vitro and in vivo efficacy. These proof-of-principle data supported the further development of Fasxiator as a novel anticoagulant candidate.
Collapse
Affiliation(s)
- W Chen
- Department of Pharmacy, National University of Singapore, Singapore City, Singapore
| | | | | | | | | |
Collapse
|
5
|
Kang TS, Hong OS, Kim KS, Yoon CS. Hearing among male firefighters: a comparison with hearing data from screened and unscreened male population. J Expo Sci Environ Epidemiol 2015; 25:106-12. [PMID: 25352160 PMCID: PMC4269805 DOI: 10.1038/jes.2014.72] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 08/28/2014] [Indexed: 06/04/2023]
Abstract
We investigated whether hearing loss is associated with firefighting. We conducted cross-sectional study comparing hearing threshold levels (HTLs) of 912 male firefighters with two hearing databases obtained from an otologically normal male Korean population (KONP) and a non-industrial noise-exposed male Korean population (KNINEP), considering age and the main roles of firefighters. Firefighters' age-adjusted HTLs were significantly worse than those of KONP (prevalence ratio (PR)=5.29, P<0.001)but not different from those of KNINEP (PR=0.99, P=0.550). Rescuers (PR=1.005, P<0.001) had worse hearing than the KNINEP after age adjustment. Comparison of firefighters' HTLs (50th and 90th percentiles) with those of KONP and KNINEP by age and frequency showed that firefighters' HTLs had significant increases (poorer hearing) across most age groups and frequencies compared with KONP. Compared with KNINEP, firefighters' HTLs were worse in the younger age groups (<45 years) but not different in the older age groups (>45 years). In conclusion, the hearing thresholds of younger firefighters and rescuers were worse than expected by normal aging alone. Future research should include longitudinal studies to consider variable risk factors, such as military service, smoking, and so on.
Collapse
Affiliation(s)
- T S Kang
- Department of Environmental Health and Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul, Korea
| | - O S Hong
- School of Nursing, University of California San Francisco, CA, USA
| | - K S Kim
- Seoul Medical Center, Seoul, Korea
| | - C S Yoon
- Department of Environmental Health and Institute of Health and Environment, Graduate School of Public Health, Seoul National University, Seoul, Korea
| |
Collapse
|
6
|
Seo HS, Suh J, Lee NH, Jung IH, Kang TS. The association of left ventricular hypertrophy (LVH) with intraventricular dyssynchrony at rest and during exercise in hypertensive patients. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p4130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
7
|
Kang TS, Korber DR, Tanaka T. Glycerol and environmental factors: effects on 1,3-propanediol production and NAD(+) regeneration in Lactobacillus panis PM1. J Appl Microbiol 2013; 115:1003-11. [PMID: 23795775 DOI: 10.1111/jam.12291] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 05/22/2013] [Accepted: 06/18/2013] [Indexed: 11/28/2022]
Abstract
AIMS This study was conducted to understand the influences of fermentation factors in NADH recycling and mechanisms of 1,3-propanediol (1,3-PDO) production in Lactobacillus panis PM1. METHODS AND RESULTS We conducted metabolite analyses, qRT-PCR of the glycerol reductive pathway [glycerol dehydratase (DhaB) and 1,3-PDO dehydrogenase (DhaT)] and DhaT activity assays at different pH, temperature and initial glycerol concentrations. The supplementation of 150 mmol l(-1) glycerol caused a shift in NADH flux from ethanol to 1,3-PDO production, whereas 300 mol l(-1) glycerol negatively affected the regeneration of NAD(+) via 1,3-PDO production. This retardation decreased transcription levels and specific activities of DhaT. The decreased DhaT activity eventually caused the shutdown of 1,3-PDO production. Temperature and pH did not significantly affect the specific activity of DhaT, whereas expression of genes for DhaB and DhaT was activated under acidic conditions. Moreover, fresh glucose addition after its depletion could not restart the glycerol reduction, but increased ethanol production. CONCLUSIONS Those environmental factors affect 1,3-PDO production in different ways through changing the expression level of enzymes and shifting the NAD(+) regeneration pathways. SIGNIFICANCE AND IMPACT OF THE STUDY Our findings elucidated a key element to optimize 1,3-PDO production by Lact. panis PM1, which potentially improves 1,3-PDO manufacturing efficiencies.
Collapse
Affiliation(s)
- T S Kang
- Department of Food and Bioproduct Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
| | | | | |
Collapse
|
8
|
|
9
|
Kang TS, Jin SK, Lee JE, Woo SW, Roh J. Comparison of genetic polymorphisms of theNAT2gene between Korean and four other ethnic groups. J Clin Pharm Ther 2009; 34:709-18. [DOI: 10.1111/j.1365-2710.2009.01065.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
10
|
Abstract
BACKGROUND AND OBJECTIVE CYP2C19 is clinically important in Korea because of the relatively high incidence of poor metabolizers in the population. To fully understand the genetic mechanism of the CYP2C19 defect in poor metabolizers, all variants need to be studied simultaneously. The aim of this study was to investigate the usefulness of CYP2C19 haplotypes as a marker of CYP2C19 enzyme activity in Koreans. METHODS We analysed the single nucleotide polymorphisms and haplotypes of the CYP2C19 gene in 150 healthy Koreans and found three major (frequency > 0.1) haplotypes (H1, H2 and H3). One oral dose of 40 mg omeprazole (Losec) was administered to 30 subjects grouped as H1/H1, H2/H2, H1/H2, H1/H3 and H2/H3. The pharmacokinetics of omeprazole and its metabolites, 5-hydroxyomeprazole and omeprazole sulphone, in those groups was analysed. RESULTS AND DISCUSSION The area under the plasma concentration-time curve (AUC(0-->infinity)) and elimination half-life (T(1/2)) of omeprazole were significantly greater in the H2/H2 and H2/H3 groups than in the H1/H1 group (P < 0.05), whereas the metabolic ratios of omeprazole to 5-hydroxyomeprazole were also markedly higher. CONCLUSION Although a specific SNP of CYP2C19 may be predictive of enzyme activity, haplotyping is more reliable for identifying poor metabolizers in populations with variant alleles other than CYP2C19*2 and *3 alleles.
Collapse
Affiliation(s)
- S K Jin
- Department of Pharmacological Research, National Institute of Toxicological Research, Korea Food and Drug Administration, Seoul, South Korea
| | | | | | | | | | | |
Collapse
|
11
|
Woo SW, Kang TS, Park HJ, Lee JE, Roh J. Comparison of linkage disequilibrium patterns and haplotype structure of eight single nucleotide polymorphisms across the CYP1A2 gene between the Korean, and other populations registered in the International HapMap database. J Clin Pharm Ther 2009; 34:429-36. [DOI: 10.1111/j.1365-2710.2008.01011.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
12
|
Kang TS, Woo SW, Park HJ, Lee Y, Roh J. Comparison of genetic polymorphisms ofCYP2E1,ADH2, andALDH2genes involved in alcohol metabolism in Koreans and four other ethnic groups. J Clin Pharm Ther 2009; 34:225-30. [DOI: 10.1111/j.1365-2710.2008.00986.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
13
|
Lee Y, Kang TS, Woo SW, Roh J. The Potential of Korea National Health Insurance Data as a Data Source for Pharmacovigilance. Drug Saf 2007. [DOI: 10.2165/00002018-200730100-00032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
|
14
|
Jang IS, Hwang DY, Lee JE, Kim YK, Kang TS, Hwang JH, Lim CH, Chae KR, Jeong JH, Cho JS. Effects of Conjugated Linoleic Acid and Stearic Acid on Apoptosis of the INS-1 β-cells and Pancreatic Islets Isolated from Zucker Obese (fa/fa) Rats. Asian Australas J Anim Sci 2003. [DOI: 10.5713/ajas.2003.1060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
15
|
Lee J, Kwon HM, Hong BK, Kim HK, Kwon KW, Kim JY, Lee KJ, Kang TS, Kim DS, Shin YH, Leem JS, Kim HS. Total occlusion of left main coronary artery by dilated main pulmonary artery in a patient with severe pulmonary hypertension. Korean J Intern Med 2001; 16:265-9. [PMID: 11855158 PMCID: PMC4578064 DOI: 10.3904/kjim.2001.16.4.265] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
A 34-year-old woman was admitted to the hospital because of recently aggravated right heart failure without angina for 5 months. When she was 25 years old, patch repair with Polytetrafluoroethylene (PTFE) was performed for the secondum type of atrial septal defect (ASD) with moderate pulmonary hypertension. The chest PA, echocardiography and cardiac catheterization at current admission revealed Eisenmenger syndrome without intracardiac shunt. Chest CT scan with contrast revealed markedly dilated pulmonary trunk, both pulmonary arteries and concave disfigurement of the left side of the ascending aorta suggesting extrinsic compression, as well as total occlusion of the ostium of the left main coronary artery that was retrogradly filled with collateral circulation from the right coronary artery. The coronary angiography showed normal right coronary artery and the collaterals that come out from the conus branch to the mid-left anterior descending artery (LAD) and that from distal right coronary artery to the left circumflex artery (LCX) and to the distal LAD, respectively. On aortography, the left main coronary artery was not visualized with no stump, suggestive of total occlusion of the ostium of the left main coronary artery. From our experience, it is possible to say that the occlusion of the ostium of the left main coronary can be induced by the dilated pulmonary artery trunk due to ASD with pulmonary hypertension and that, if the ASD closure was too late, the narrowing or obstruction of the left coronary artery could not be resolved even after operation owing to irreversible pulmonary hypertension.
Collapse
Affiliation(s)
- J Lee
- Cardiology Division, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea, 146-92, Dogok-Dong, Kangnam-Gu, Seoul 135-270, Korea
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Kwon HM, Hong BK, Kang TS, Kwon K, Kim HK, Jang Y, Choi D, Park HY, Kang SM, Cho SY, Kim HS. Expression of osteopontin in calcified coronary atherosclerotic plaques. J Korean Med Sci 2000; 15:485-93. [PMID: 11068982 PMCID: PMC3054686 DOI: 10.3346/jkms.2000.15.5.485] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Advanced atherosclerosis is often associated with dystrophic calcification and remodeling of extracellular matrix of vascular wall. Recently many studies have documented a general relationship between calcification and severity of coronary disease, and discussed the feasibility of electron beam computed tomography for detecting and quantifying the coronary artery calcification in the patients. The present study investigated the expression and the localization of osteopontin, one of noncollagenous bone matrix protein, within the calcified coronary arteries. Autopsy-derived coronary artery specimens were scanned and reconstructed to visualize the pattern of coronary calcification using a novel microscopic computed tomography technique. The localization of the osteopontin were evaluated by immunohistochemial stain with LF7. The present study showed that the pattern of coronary calcification is variable and the expression of osteopontin is localized mainly to calcified lesion. The smooth muscle cells in addition to macrophage expressed osteopontin protein in human coronary atherosclerotic plaques. Soluble osteopontin released near to the sites of vascular calcification may represent an adaptive mechanism aimed at regulating the process of vascular calcification.
Collapse
Affiliation(s)
- H M Kwon
- Yonsei Cardiovascular Center and Research Institute, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Song YG, Kwon HM, Kim JM, Hong BK, Kim DS, Huh AJ, Chang KH, Kim HY, Kang TS, Lee BK, Choi DH, Jang YS, Kim HS. Serologic and histopathologic study of Chlamydia pneumoniae infection in atherosclerosis: a possible pathogenetic mechanism of atherosclerosis induced by Chlamydia pneumoniae. Yonsei Med J 2000; 41:319-27. [PMID: 10957885 DOI: 10.3349/ymj.2000.41.3.319] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Chronic infection and inflammation have recently been implicated as important etiologic agents for atherosclerosis in general and, in particular, ischemic heart disease. Several agents have been suggested as possible candidates for the chronic inflammation including cytomegalovirus, Helicobacter pylori and Chlamydia pneumoniae. We hypothesized that a vascular infection with C. pneumoniae may induce a chronic inflammatory reaction in the host vascular tissue and activated inflammatory cells may express inflammatory mediators such as cyclooxygenase-2 (COX-2) and matrix metalloproteinases (MMPs). At first, we evaluated the relationship between C. pneumoniae infection and atherosclerosis indirectly by serologic study, and then, to confirm our hypothesis, we performed an immunohistochemical study of atherosclerotic plaques. The seropositive rate of anti-Chlamydia pneumoniae IgG was higher in the disease group (Group I, 59.8%, n = 254) than in the negative control group (Group III, 47.4%, n = 97) (p = 0.041), but the anti-Chlamydia pneumoniae IgA was not different in seropositivity between the two groups (Group I, 64.6%; Group III, 57.7%). The simultaneous seropositive rates of both IgG and IgA were 56.7% in Group I and 43.3% in Group III (p = 0.033). In subgroups without the conventional risk factors of atherosclerosis, these findings were more prominent. Furthermore, we performed immunohistochemical staining on the atherosclerotic aortic tissues obtained from patients that were seropositive to C. pneumoniae (n = 5), by using antibodies to C. pneumoniae, COX-2, and MMP-9. The immunoreactivity for COX-2 and MMP-9 increased in the atherosclerotic plaques itself, predominantly in the surrounding area of immunoreactive C. pneumoniae. These findings support our hypothesis and C. pneumoniae may participate in a pathogenetic mechanism for atherogenesis or progression of atherosclerosis. The present study may open a promising perspective concerning future therapeutic trials of chronic inflammation related atherogenesis under pathophysiological conditions.
Collapse
Affiliation(s)
- Y G Song
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Abstract
OBJECTIVE/HYPOTHESIS To determine if angiogenic growth factors including vascular endothelial growth factor (VEGF) and platelet-derived endothelial cell growth factor (PD-ECGF) are expressed in human paragangliomas. STUDY DESIGN A histopathologic and molecular examination of paraganglioma specimens obtained from surgical cases or retrieved from the Pathology Department of the Massachusetts Eye and Ear Infirmary. METHODS Fresh tumor or archival, paraffin-embedded paraganglioma specimens were analyzed by immunohistochemistry, Western blotting, and ELISA. RESULTS Positive immunohistochemical staining for VEGF was observed in five of nine surgical specimens and in six of eight archival specimens (11/17, or 65%). PD-ECGF immunoreactivity was detected in four of five surgical specimens and six of eight archival specimens (10/13, or 77%). The presence of PD-ECGF was confirmed by Western blot assay and ELISA confirmed the presence of VEGF in tumor extract. CONCLUSIONS Both VEGF and PD-ECGF are expressed in paragangliomas and may contribute to the extreme vascularity of these tumors. Key Words. Vascular endothelial growth factor, platelet-derived, endothelial cell growth factor, hypoxia, tumor vasculature.
Collapse
Affiliation(s)
- R W Jyung
- Department of Otorhinolaryngology, Temple University School of Medicine, Philadelphia, Pennsylvania 19140, USA.
| | | | | | | | | | | | | |
Collapse
|
19
|
Hong BK, Kwon HM, Byun KH, Kim D, Choi EY, Kang TS, Kang SM, Chun KJ, Jang Y, Kim HS, Kim M. Apoptosis in dilated cardiomyopathy. Korean J Intern Med 2000; 15:56-64. [PMID: 10714093 PMCID: PMC4531747 DOI: 10.3904/kjim.2000.15.1.56] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE Cardiomyopathy, a popular diagnosis that always obscures more than it reveals, nevertheless has several characteristic histological features. These prominently include widespread focal myocardial fibrosis and associated hypertrophy of surviving cardiac myocyte. In fact, focal noninflammatory degeneration (not necrosis) has been demonstrated as a feature of many forms of cardiac hypertrophy. We hypothesized that this loss of myocardial cells in dilated cardiomyopathy (DCMP) may result from cell death by apoptosis. METHODS Endomyocardial biopsy specimens from the right ventricles of six patients who suffered from DCMP were studied, and myocardial specimens from two persons who died in motor vehicle accidents were used as negative controls. For identification of apoptosis, immunohistochemistry with terminal deoxynucleotidyl transferase (TdT)-mediated dUTP-biotin nick end-labeling was performed. In addition, apoptosis was confirmed morphologically by confocal laser scanning microscopy with propidium iodide. RESULTS Apoptosis, that was represented by an apoptotic index ranging from 19.8 to 25.4%, could be extensively seen in myocytes and also rarely in non-myocytes of interstitium and vascular endothelium. Morphologically, there were a lot of nuclei with clumps of condensed chromatin, suggestive of apoptosis. CONCLUSION The present study demonstrated that myocyte loss in DCMP might be mainly due to the apoptosis of myocytes and interstitial cells, rather than inflammation or cell necrosis.
Collapse
Affiliation(s)
- B K Hong
- Cardiology Division, Yonsei Cardiovascular Center, Yonsei University College of Medicine, Seoul, Korea
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
20
|
Jang IS, Chae KR, Kang TS, Kim YK, Kim CK, Hwang JH, Hwang DY, Choi CB, Jung KK, Cho JS. Effects of Long-Term Vitamin E and Butylated Hydroxytoluene Supplemented Diets on Murine Intestinal and Hepatic Antioxidant Enzyme Activities. Asian Australas J Anim Sci 1999. [DOI: 10.5713/ajas.1999.932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
21
|
Oleshko VP, Gijbels RH, Van Daele AJ, Jacob WA, Xu YE, Wang SE, Park IY, Kang TS. Combined characterization of composite tabular silver halide microcrystals by cryo-EFTEM/EELS and cryo-STEM/EDX techniques. Microsc Res Tech 1998; 42:108-22. [PMID: 9728882 DOI: 10.1002/(sici)1097-0029(19980715)42:2<108::aid-jemt5>3.0.co;2-p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The combination of cryo-energy filtering transmission electron microscopy (EFTEM)/electron spectroscopic diffraction (ESD)/electron energy-loss spectroscopy (EELS) and cryo-energy-dispersive X-ray (EDX) analysis in the scanning transmission (STEM) and scanning (SEM) modes was applied for the characterization of composite tabular Ag(Br,I) microcrystals. A low-loss fine structure in EEL spectra between 4 and 26 eV was attributed to excitons and plasmons possibly superimposed with interband transitions and many-electron effects. The contrast tuning under the energy-filtering in the low-loss region was used to image the crystal morphology, defect structure (random dislocations and ¿111¿ stacking faults) and bend and edge contours as well as electron excitations in the microcrystals. Sharp extra reflections at commensurate positions in between the main Bragg reflections and diffuse honeycomb contours in ESD patterns of the microcrystals taken near the [111] zone were assigned to the number of defects in the shell region parallel to the grain edges and polyhedral clusters of interstitial silver cations, respectively. The imaginary part of the energy-loss function, Im (-1/epsilon), and the real and imaginary parts, epsilon1 and epsilon2, of the dielectric permittivity were determined by means of a Kramers-Kronig analysis. An assignment of exciton peaks based on calculations of electronic band structure of silver bromide is proposed. Inner-shell excitation bands of silver halide were detected in line with EDX-analyses. The energy-loss near-edge structure (ELNES) of the AgM4,5-edge governed by spin-orbital splitting between the 3d3/2- and 3d5/2-states has been evaluated. Combined silver and halide distributions were obtained by a three-window method (EFTEM) and by EDX/STEM including area mapping and line profiling of iodide.
Collapse
Affiliation(s)
- V P Oleshko
- Micro- and Trace Analysis Center, Department of Chemistry, University of Antwerp (UIA), Wilrijk-Antwerpen, Belgium.
| | | | | | | | | | | | | | | |
Collapse
|
22
|
Lee KC, Kang TS, Woo BH, Lee JT, Lee HS, DeLuca PP. Reversed-phase high-performance liquid chromatography of radioiodinated salmon calcitonins. J Chromatogr B Biomed Sci Appl 1997; 694:31-7. [PMID: 9234845 DOI: 10.1016/s0378-4347(97)00154-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Reversed-phase HPLC conditions for simultaneous separation of salmon calcitonin, mono- and di-radioiodinated salmon calcitonins and their tryptic digested fragments have been developed. Salmon calcitonin was radioiodinated with Na125I by the iodo-beads method. After solid-phase extraction from the reaction mixtures using C18 Bond Elut cartridges, mono- and di-radioiodinated salmon calcitonins were separated from each other, as well as from unlabeled salmon calcitonin, on a Bondclone 10 C18 column (300x7.8 mm I.D.) by isocratic elution with 0.1% trifluoroacetic acid in 34% aqueous acetonitrile. The characteristics of either iodinated peptides or unlabeled salmon calcitonin were evaluated on the basis of UV absorbance (215 and 280 nm), fluorescence (lambda(ex)=282 nm, lambda(em)=310 nm) and measurement of specific radioactivity by means of a flow-through radio-isotope detector. HPLC separation of a tryptic digest of iodinated salmon calcitonin fraction on a W-porex 5 C18 300 A column (250x4.6 mm I.D.) and subsequent amino acid analysis, led to the conclusion that radioiodination took place at the Tyr residue and not at the His moiety.
Collapse
Affiliation(s)
- K C Lee
- College of Pharmacy, SungKyunKwan University, Jangan-ku, Suwon City, South Korea
| | | | | | | | | | | |
Collapse
|
23
|
McFarquhar GM, List R, Hudak DR, Nissen RP, Dobbie JS, Tung NP, Kang TS. Flux Measurements of Pulsating Rain with a Disdrometer and Doppler Radar during Phase II of the Joint Tropical Rain Experiment in Malaysia. ACTA ACUST UNITED AC 1996. [DOI: 10.1175/1520-0450(1996)035<0859:fmoprw>2.0.co;2] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
24
|
Bazargan M, Kang TS, Bazargan S. A multivariate comparison of elderly African Americans and Caucasians voting behavior: how do social, health, psychological, and political variables effect their voting? Int J Aging Hum Dev 1991; 32:181-98. [PMID: 2060982 DOI: 10.2190/49tt-9afr-ux2g-pgfu] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
No study until now has examined the impact of the physical and psychological condition on voter turnout among elderly African Americans and Caucasians. Utilizing data from a national survey (Aging in the Eighties) and using multiple logistic regression, the present study examines the impact of health rating and life satisfaction as well as other socio-psychological characteristics on voting turnout among elderly Caucasian and African Americans. The results provide some empirical evidence that the pattern of election participation can be significantly influenced by the self-assessment of health and life satisfaction. For elderly Caucasians self-assessment of health is significantly related to voting behavior, whereas among elderly African Americans life satisfaction shows significant impact on turnout. Elderly African Americans who identified their personal political philosophy as "liberal" were more likely to vote, while among elderly Caucasians, those who identified their personal political philosophy as "conservative" were more likely to vote. In addition, SES, age, and organizational activity proved to have significantly independent impact on elderly Caucasian turnout, whereas among elderly African Americans, education was detected as a significant predictor.
Collapse
|
25
|
|