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Postill G, Benchimol EI, Im J, Tang A, Kuenzig E. A16 UNMET HEALTHCARE NEEDS AMONG PEOPLE WITH INFLAMMATORY BOWEL DISEASE: A NATIONAL CROSS-SECTIONAL POPULATION-REPRESENTATIVE STUDY. J Can Assoc Gastroenterol 2023. [PMCID: PMC9991203 DOI: 10.1093/jcag/gwac036.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
Background Inflammatory bowel disease (IBD) is a chronic inflammatory disease primarily affecting the gastrointestinal tract. Despite treatment with the current standards of care, many IBD patients experience relapsing, remitting, and disabling bowel symptoms and significant disease complications. Ensuring patients have adequate access to high quality multidisciplinary healthcare is vital for the short- and long-term wellbeing of IBD patients. Purpose (1) Compare unmet healthcare needs of people with and without IBD. (2) Determine whether accessing regular medical care mediates the association between IBD and unmet healthcare needs. (3) Describe the reasons for unmet healthcare needs among people with and without IBD. Method We used the 2014 Canadian Community Health Survey, a population-representative national cross-sectional survey conducted by Statistics Canada. Respondents with a non-IBD bowel disorder or aged 18 or younger were excluded. Survey weights were used for descriptive statistics. We used multilevel logistic regression to compare perceived unmet healthcare needs among individuals with and without IBD, clustering by health region and controlling for age, immigration status, race, home ownership, marital status, annual household income, education level, and number of chronic conditions (0, 1, 2+). In a second model, we additionally controlled for having a regular family doctor, having consulted a specialist, and having consulted a psychologist to assess if regularly accessing medical care mediated the association between IBD and unmet healthcare needs. Individuals reporting unmet healthcare needs were asked about the reasons for their unmet healthcare needs. Responses are summarized with weighted percentages, plotted in a bar graph. Result(s) Among the 690 IBD and 62,832 non-IBD eligible survey respondents, 16.7% of people with IBD had an unmet healthcare need within the past 12 months, compared with 10.3% of those without IBD (OR 1.39, 95% CI 1.12 to 1.74). Additionally adjusting for regular access to medical care slightly attenuated the association between IBD and unmet healthcare needs (OR 1.29, 95% CI 1.03 to 1.62). Reasons for unmet healthcare needs differed among those with and without IBD (Figure). Specifically, doctors believing that care was unnecessary and the cost of care were more likely to be the reason people with IBD had an unmet healthcare need. Image ![]()
Conclusion(s) People with IBD are more likely to have an unmet healthcare need that was partially mediated by access to healthcare professionals. Our work highlights the need for further research into the types of unmet healthcare needs experienced by people living with IBD. This underscores the need for multidisciplinary healthcare teams to address the increased burden of unmet healthcare needs in the IBD population. Please acknowledge all funding agencies by checking the applicable boxes below None Disclosure of Interest G. Postill: None Declared, E. Benchimol Consultant of: Hoffman La-Roche Limited and Peabody & Arnold LLP for matters unrelated to medications used to treat inflammatory bowel disease. Dr. Benchimol has also acted as a consultant for McKesson Canada and the Dairy Farmers of Ontario for matters unrelated to medications used to treat inflammatory bowel disease., J. Im: None Declared, A. Tang: None Declared, E. Kuenzig: None Declared
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Affiliation(s)
- G Postill
- Temerty Faculty of Medicine, University of Toronto
| | - E I Benchimol
- Temerty Faculty of Medicine, University of Toronto,SickKids Inflammatory Bowel Disease Centre, Division of Gastroenterology, Hepatology and Nutrition, Department of Paediatrics, The Hospital for Sick Children,Child Health Evaluative Sciences, SickKids Research Institute,Institute of Health Policy, Management and Evaluation, University of Toronto,Institute for Clinical and Evaluative Sciences, Toronto, Canada
| | - J Im
- Child Health Evaluative Sciences, SickKids Research Institute
| | - A Tang
- Child Health Evaluative Sciences, SickKids Research Institute
| | - E Kuenzig
- SickKids Inflammatory Bowel Disease Centre, Division of Gastroenterology, Hepatology and Nutrition, Department of Paediatrics, The Hospital for Sick Children,Child Health Evaluative Sciences, SickKids Research Institute
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2
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Khan R, Kuenzig E, Tang A, Im J, Widdifield J, McCurdy J, Kaplan G, Benchimol E. A177 RISK OF VENOUS THROMBOEMBOLISM IN COVID-19 PATIENTS WITH INFLAMMATORY BOWEL DISEASE: A POPULATION-BASED MATCHED COHORT STUDY. J Can Assoc Gastroenterol 2023. [PMCID: PMC9991269 DOI: 10.1093/jcag/gwac036.177] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/09/2023] Open
Abstract
Background Venous thromboembolism (VTE), is associated with significant morbidity and mortality. Inflammation increases the risk of VTE, and it is a well-recognised complication of both inflammatory bowel disease (IBD) and COVID-19. Purpose To compare the risk of VTE among individuals with and without IBD following a positive COVID-19 test. Method Using health administrative data from Ontario, Canada we conducted a retrospective matched cohort study.All Ontario residents with a positive SARS-CoV-2 PCR test between January 1,2020 and December 30,2021 who had been diagnosed with IBD prior to their COVID-19 infection (identified using a validated algorithm) were matched to 5 individuals without IBD based on year of birth, sex, mean neighbourhood income quintile, date of positive COVID-19 test, and rural/urban residence. Individuals with a cancer diagnosis in the 5 years prior to their first COVID-19 positive test were excluded. Individuals were followed from positive COVID-19 PCR test until VTE event, death, migration out of Ontario or March 31, 2022.VTEs were identified from emergency department or hospitalization data using ICD-10 codes. Incidence rate of VTEs among individuals with IBD were assessed at 1, 6 and 12 months. Proportional cause-specific hazards models compared the risk of VTEs in people with and without IBD, treating death as a competing risk and controlling for vaccination status (2nd dose ≥14 days prior to positive COVID-19 test) and a history of VTE (VTE in the 5 years prior to infection). Result(s) There were 4293 people with IBD (44% Crohn’s disease, mean age ±SD 46.1±17.2 y) matched to 20,207 with out IBD (mean age 45.3±16.8 y) with a positive SARS-CoV-2 PCR test. Within 1 month of a positive COVID-19 test, the crude incidence rate of VTE in individuals with IBD was 4.77(95%CI, 4.75-4.80) per 100,000 person-days compared to 8.25(95%CI, 8.20-8.30) per 100,000 among people without IBD.Within 6 months, these rates were 1.86(95%CI, 1.86-1.87) and 2.12(95%CI, 2.11-2.12) per 100,000 person-days among people with and without IBD, respectivley. Within 12 months, these rates were 1.59(95% CI, 1.58-1.59) and 1.42(95% CI, 1.42-1.42) per 100,000 person-days among people with and without IBD, respectively.After adjusting for vaccination status and history of VTE there was no difference in the risk of VTE for people with and without IBD (HR 1.08, 95%CI, 0.64 to 1.83). Conclusion(s) IBD patients with COVID-19 were not more likely to experience a VTE infection compared with the general popluation. The risk of VTE was highest soon after COVID-19 and declined thereafter. Please acknowledge all funding agencies by checking the applicable boxes below None Disclosure of Interest None Declared
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Affiliation(s)
- R Khan
- SickKids Inflammatory Bowel Disease Centre, Division of Gastroenterology, Hepatology and Nutrition, Department of Paediatrics, The Hospital for Sick Children, University of Toronto,ICES
| | - E Kuenzig
- Child Health Evaluative Sciences, SickKids Research Institute
| | - A Tang
- Child Health Evaluative Sciences, SickKids Research Institute
| | - J Im
- Child Health Evaluative Sciences, SickKids Research Institute
| | - J Widdifield
- ICES,Institute of Health Policy, Management and Evaluation, University of Toronto
| | - J McCurdy
- Department of Medicine, University of Ottawa, Ottawa, Canada
| | - G Kaplan
- Department of Medicine and Community Health Sciences, University of Calgary, Toronto, Canada
| | - E Benchimol
- SickKids Inflammatory Bowel Disease Centre, Division of Gastroenterology, Hepatology and Nutrition, Department of Paediatrics, The Hospital for Sick Children, University of Toronto,ICES,Child Health Evaluative Sciences, SickKids Research Institute,Institute of Health Policy, Management and Evaluation, University of Toronto
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3
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Kim H, Im J, Nam K, Han GH, Park JY, Yoo S, Haddadnezhad M, Park S, Park W, Ahn JS, Park D, Jeong MS, Choi S. Plasmon-exciton couplings in the MoS 2/AuNP plasmonic hybrid structure. Sci Rep 2022; 12:22252. [PMID: 36564476 PMCID: PMC9789063 DOI: 10.1038/s41598-022-26485-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Accepted: 12/15/2022] [Indexed: 12/24/2022] Open
Abstract
The understanding and engineering of the plasmon-exciton coupling are necessary to control the innovative optoelectronic device platform. In this study, we investigated the intertwined mechanism of each plasmon-exciton couplings in monolayer molybdenum disulfide (MoS2) and plasmonic hybrid structure. The results of absorption, simulation, electrostatics, and emission spectra show that interaction between photoexcited carrier and exciton modes are successfully coupled by energy transfer and exciton recombination processes. Especially, neutral exciton, trion, and biexciton can be selectively enhanced by designing the plasmonic hybrid platform. All of these results imply that there is another degree of freedom to control the individual enhancement of each exciton mode in the development of nano optoelectronic devices.
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Affiliation(s)
- Hyuntae Kim
- grid.412977.e0000 0004 0532 7395Department of Physics, Incheon National University, Incheon, 22012 Republic of Korea
| | - Jaeseung Im
- grid.412977.e0000 0004 0532 7395Department of Physics, Incheon National University, Incheon, 22012 Republic of Korea
| | - Kiin Nam
- grid.412977.e0000 0004 0532 7395Department of Physics, Incheon National University, Incheon, 22012 Republic of Korea
| | - Gang Hee Han
- grid.412977.e0000 0004 0532 7395Department of Physics, Incheon National University, Incheon, 22012 Republic of Korea
| | - Jin Young Park
- grid.412977.e0000 0004 0532 7395Department of Physics, Incheon National University, Incheon, 22012 Republic of Korea
| | - Sungjae Yoo
- grid.264381.a0000 0001 2181 989XDepartment of Chemistry, Sungkyunkwan University, Suwon, 16419 Republic of Korea
| | - MohammadNavid Haddadnezhad
- grid.264381.a0000 0001 2181 989XDepartment of Chemistry, Sungkyunkwan University, Suwon, 16419 Republic of Korea
| | - Sungho Park
- grid.264381.a0000 0001 2181 989XDepartment of Chemistry, Sungkyunkwan University, Suwon, 16419 Republic of Korea
| | - Woongkyu Park
- grid.482524.d0000 0004 0614 4232Medical and Bio Photonics Research Center, Korea Photonics Technology Institute (KOPTI), Gwangju, 61007 Republic of Korea
| | - Jae Sung Ahn
- grid.482524.d0000 0004 0614 4232Medical and Bio Photonics Research Center, Korea Photonics Technology Institute (KOPTI), Gwangju, 61007 Republic of Korea
| | - Doojae Park
- grid.256753.00000 0004 0470 5964Department of Applied Optics and Physics, Hallym University, Chuncheon, 24252 Republic of Korea
| | - Mun Seok Jeong
- grid.49606.3d0000 0001 1364 9317Department of Physics, Hanyang University, Seoul, 04763 Republic of Korea ,grid.49606.3d0000 0001 1364 9317Department of Energy Engineering, Hanyang University, Seoul, 04763 Republic of Korea
| | - Soobong Choi
- grid.412977.e0000 0004 0532 7395Department of Physics, Incheon National University, Incheon, 22012 Republic of Korea
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Shin Y, Im J, Yoon H. 323P Development of a model to predict PD-L1 expression in pulmonary squamous cell carcinoma based on CT imaging features. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.10.362] [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: 12/05/2022] Open
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5
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Kim S, Liu H, Kwan K, Im J, Soltani H, Kaplan N, Paller A. 827 Psoriasis exacerbation by obesity reflects reduced adiponectin regulation of PPAR-γ/Th17 pathway activation and is reversal by adiponectin receptor agonism. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.05.841] [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: 11/26/2022]
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6
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Im J, Goo T, Kim J, Choi S, Hong SJ, Bahk YM. Detection of Microplastic in Salts Using Terahertz Time-Domain Spectroscopy. Sensors (Basel) 2021; 21:s21093161. [PMID: 34063265 PMCID: PMC8125003 DOI: 10.3390/s21093161] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/27/2021] [Revised: 04/29/2021] [Accepted: 04/30/2021] [Indexed: 11/16/2022]
Abstract
We report on a prototypical study of the detection of microplastic embedded in table salts by using terahertz time-domain spectroscopy. In the experiment, high-density polyethylene (HDPE) of sizes from 150 to 400 μm are used as a representative microplastic and mixed with table salts. Analyzing terahertz transmittance with an effective medium model, we extract various optical properties such as refractive index, absorption coefficient, and real/imaginary parts of the dielectric constant of the mixture. Consequently, the optical properties exhibit volume-ratio-dependence in 0.1-0.5 THz regimes. Especially, the refractive index and the real part of the dielectric constant possess monotonic frequency dependence, meaning that the quantities can be relevant indicators for the detection of the microplastic in terms of practical applications. Our work proves that terahertz time-domain spectroscopy can pave a way to recognize microplastic mixed with salts and be expanded for detecting various micro-sized particles.
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Affiliation(s)
- Jaeseung Im
- Department of Physics, Incheon National University, Incheon 22012, Korea; (J.I.); (T.G.); (J.K.); (S.C.)
| | - Taewon Goo
- Department of Physics, Incheon National University, Incheon 22012, Korea; (J.I.); (T.G.); (J.K.); (S.C.)
| | - Jugyoung Kim
- Department of Physics, Incheon National University, Incheon 22012, Korea; (J.I.); (T.G.); (J.K.); (S.C.)
| | - Soobong Choi
- Department of Physics, Incheon National University, Incheon 22012, Korea; (J.I.); (T.G.); (J.K.); (S.C.)
| | - Sung Ju Hong
- Division of Science Education, Kangwon National University, Chuncheon 24341, Korea
- Correspondence: (S.J.H.); (Y.-M.B.); Tel.: +82-33-250-6735 (S.J.H.); +82-32-835-8223 (Y.-M.B.)
| | - Young-Mi Bahk
- Department of Physics, Incheon National University, Incheon 22012, Korea; (J.I.); (T.G.); (J.K.); (S.C.)
- Correspondence: (S.J.H.); (Y.-M.B.); Tel.: +82-33-250-6735 (S.J.H.); +82-32-835-8223 (Y.-M.B.)
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7
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Kim SK, Im J, Yoon CE, Oh HB. Identification of a new HLA-A*11 allele, A*11:251N. HLA 2018; 92:167-168. [PMID: 29896792 DOI: 10.1111/tan.13310] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 06/07/2018] [Accepted: 06/09/2018] [Indexed: 11/29/2022]
Abstract
The new allele, A*11:251N, differs from A*11:01:01 by insertion of two nucleotides at position 204-205.
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Affiliation(s)
- S K Kim
- Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul, South Korea
| | - J Im
- Biowithus Life Science Institute, Seoul, South Korea
| | - C E Yoon
- Biowithus Life Science Institute, Seoul, South Korea
| | - H-B Oh
- Department of Laboratory Medicine, University of Ulsan College of Medicine and Asan Medical Center, Seoul, South Korea
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8
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Choi HJ, Im J, Lee JH, Kim SH, Shin MG. Identification of the novel HLA-B*15:18:01:04 in a Korean individual. HLA 2018; 92:99-100. [PMID: 29766670 DOI: 10.1111/tan.13295] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 05/05/2018] [Accepted: 05/07/2018] [Indexed: 11/30/2022]
Abstract
HLA-B*15:18:01:04 differs from HLA-B*15:18:01:02 by single nucleotide substitution at position 2176 (G > A).
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Affiliation(s)
- H J Choi
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - J Im
- Department of Molecular Genetics, Biowithus Life Science Institute, Seoul, South Korea
| | - J H Lee
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - S H Kim
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - M G Shin
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
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9
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Park BG, Kim SK, Im J, Yoon CE, Oh HB. Three novel HLA alleles discovered in Koreans, HLA-A*26:118
, DQB1*02:65
and DPB1*05:01:07. HLA 2018; 91:293-294. [DOI: 10.1111/tan.13237] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2018] [Revised: 02/12/2018] [Accepted: 02/13/2018] [Indexed: 11/30/2022]
Affiliation(s)
- B. G. Park
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - S.-K. Kim
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - J. Im
- Biowithus Life Science Institute; Seoul South Korea
| | - C. E. Yoon
- Biowithus Life Science Institute; Seoul South Korea
| | - H. B. Oh
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
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10
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Park BG, Oh HB, Im J, Yoon CE, Kwon OJ. Identification of the novel HLA-C*03
allele, HLA-C*03:03:35. HLA 2018; 91:306-307. [DOI: 10.1111/tan.13230] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2018] [Revised: 01/29/2018] [Accepted: 01/29/2018] [Indexed: 11/29/2022]
Affiliation(s)
- B. G. Park
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - H.-B. Oh
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - J. Im
- Biowithus Life Science Institute; Seoul South Korea
| | - C. E. Yoon
- Biowithus Life Science Institute; Seoul South Korea
| | - O.-J. Kwon
- Biowithus Life Science Institute; Seoul South Korea
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11
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Park BG, Kim SK, Im J, Yoon CE, Oh HB. Four novel alleles in Korean individuals, HLA-B*40:323
, DRB1*14:177
, DQB1*03:200
, and DQB1*06:205. HLA 2018; 91:300-301. [DOI: 10.1111/tan.13234] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 02/05/2018] [Accepted: 02/07/2018] [Indexed: 11/27/2022]
Affiliation(s)
- B. G. Park
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - S.-K. Kim
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - J. Im
- Biowithus Life Science Institute; Seoul South Korea
| | - C. E. Yoon
- Biowithus Life Science Institute; Seoul South Korea
| | - H.-B. Oh
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
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12
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Park BG, Oh HB, Im J, Yoon CE, Kwon OJ. A new HLA-DQB1*04
allele, HLA-DQB1*04:01:05,
identified in a Korean individual. HLA 2018; 91:312-313. [DOI: 10.1111/tan.13227] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 01/24/2018] [Accepted: 01/26/2018] [Indexed: 11/27/2022]
Affiliation(s)
- B. G. Park
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - H.-B. Oh
- Department of Laboratory Medicine; University of Ulsan College of Medicine and Asan Medical Center; Seoul South Korea
| | - J. Im
- Biowithus Life Science Institute; Seoul South Korea
| | - C. E. Yoon
- Biowithus Life Science Institute; Seoul South Korea
| | - O.-J. Kwon
- Biowithus Life Science Institute; Seoul South Korea
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Lee JH, Im J, Choi HJ, Kim SH, Shin MG. HLA-B*40:302, a novel allele identified by sequence-based typing in a Korean individual. HLA 2017; 90:368-369. [PMID: 28884955 DOI: 10.1111/tan.13140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 08/28/2017] [Revised: 09/04/2017] [Accepted: 09/05/2017] [Indexed: 11/29/2022]
Abstract
B*40:302 differs from B*40:02:01:01 by a single nonsynonymous nucleotide substitution at codon 81 (CCG→CTG).
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Affiliation(s)
- J H Lee
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - J Im
- Department of Molecular Genetics, Biowithus Life Science Institute, Seoul, South Korea
| | - H-J Choi
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - S-H Kim
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - M-G Shin
- Department of Laboratory Medicine, Chonnam National University Medical School and Chonnam National University Hwasun Hospital, Hwasun, South Korea.,Environmental Health Center for Childhood Leukemia and Cancer, Chonnam National University Hwasun Hospital, Hwasun, South Korea.,Brain Korea 21 Plus Project, Chonnam National University Medical School, Gwangju, South Korea
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14
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Choi HJ, Im J, Lee JH, Kim SH, Shin MG. HLA-DPB1*518:01
, a new allele identified by sequence-based typing in a Korean individual. HLA 2017; 90:316-318. [DOI: 10.1111/tan.13107] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2017] [Accepted: 07/31/2017] [Indexed: 11/26/2022]
Affiliation(s)
- H. J. Choi
- Department of Laboratory Medicine; Chonnam National University Medical School & Chonnam National University Hwasun Hospital; Hwasun South Korea
| | - J. Im
- Department of Molecular Genetics; Biowithus Life Science Institute; Seoul South Korea
| | - J. H. Lee
- Department of Laboratory Medicine; Chonnam National University Medical School & Chonnam National University Hwasun Hospital; Hwasun South Korea
| | - S. H. Kim
- Department of Laboratory Medicine; Chonnam National University Medical School & Chonnam National University Hwasun Hospital; Hwasun South Korea
| | - M. G. Shin
- Department of Laboratory Medicine; Chonnam National University Medical School & Chonnam National University Hwasun Hospital; Hwasun South Korea
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15
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Park Y, Kim H, Im J, Yoon CE, Kim HS. Identification of a novel allele, HLA-A*02:01:131, by full-length genomic sequencing. HLA 2017; 90:360-361. [PMID: 28846214 DOI: 10.1111/tan.13134] [Citation(s) in RCA: 3] [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] [Received: 08/17/2017] [Revised: 08/22/2017] [Accepted: 08/23/2017] [Indexed: 11/29/2022]
Abstract
The HLA-A*02:01:131 allele differs by a single nucleotide at codon 236 compared with HLA-A*02:01:01:01.
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Affiliation(s)
- Y Park
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - H Kim
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - J Im
- BioWithus Life Science Institute, Seoul, South Korea
| | - C E Yoon
- BioWithus Life Science Institute, Seoul, South Korea
| | - H S Kim
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
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Choi HJ, Im J, Lee JH, Kim SH, Shin MG. HLA-DPB1*519:01, a new allele identified by sequence-based typing in a Korean individual. HLA 2017; 90:318-319. [PMID: 28776957 DOI: 10.1111/tan.13109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 07/30/2017] [Accepted: 07/31/2017] [Indexed: 11/28/2022]
Abstract
The new allele DPB1*519:01 showed one nucleotide difference with DPB1*13:01:01 at codon 234 (GTG/ATG).
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Affiliation(s)
- H J Choi
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - J Im
- Department of Molecular Genetics, Biowithus Life Science Institute, Seoul, South Korea
| | - J H Lee
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - S H Kim
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
| | - M G Shin
- Department of Laboratory Medicine, Chonnam National University Medical School & Chonnam National University Hwasun Hospital, Hwasun, South Korea
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17
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Park Y, Kim H, Im J, Yoon CE, Kim HS. Identification of a novel allele, HLA-C*02:02:33, by full-length genomic sequencing. HLA 2017; 90:313-314. [PMID: 28727268 DOI: 10.1111/tan.13096] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 07/15/2017] [Indexed: 11/28/2022]
Abstract
The HLA-C*02:02:33 allele differs by a single nucleotide at codon 215 compared with HLA-C*02:02:02:01.
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Affiliation(s)
- Y Park
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - H Kim
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - J Im
- BioWithus Life Science Institute, Seoul, South Korea
| | - C E Yoon
- BioWithus Life Science Institute, Seoul, South Korea
| | - H S Kim
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
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18
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Park Y, Park BG, Im J, Yoon CE, Kim HS. A novel allele, HLA-C*14:02:01:03, identified by full-length genomic sequencing. HLA 2017; 90:260-261. [PMID: 28722359 DOI: 10.1111/tan.13087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 06/21/2017] [Accepted: 06/26/2017] [Indexed: 11/27/2022]
Abstract
The HLA-C*14:02:01:03 differs by a single nucleotide at intron 5 (2157 C>T) compared with C*14:02:01:01.
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Affiliation(s)
- Y Park
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - B G Park
- Department of Laboratory Medicine, Asan Medical Center, Ulsan University, Seoul, South Korea
| | - J Im
- BioWithus Life Science Institute, Seoul, South Korea
| | - C E Yoon
- BioWithus Life Science Institute, Seoul, South Korea
| | - H S Kim
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
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19
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Park Y, Im J, Yoon CE, Kim HS. Identification of a novel allele, HLA-C*01:135, by full-length genomic sequencing. HLA 2017; 90:258-259. [PMID: 28707428 DOI: 10.1111/tan.13086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 06/20/2017] [Accepted: 06/21/2017] [Indexed: 11/30/2022]
Abstract
The HLA-C*01:135 allele differs by a single nucleotide at codon 265 compared with HLA-C*01:02:01:01.
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Affiliation(s)
- Y Park
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
| | - J Im
- BioWithus Life Science Institute, Seoul, Korea
| | - C E Yoon
- BioWithus Life Science Institute, Seoul, Korea
| | - H S Kim
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
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20
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Ko SY, Im J, Lee CK, Cho Y. Identification of a novel HLA-B allele, HLA-B*55:81. HLA 2017; 89:166-167. [PMID: 28156057 DOI: 10.1111/tan.12972] [Citation(s) in RCA: 3] [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] [Received: 01/04/2017] [Revised: 01/16/2017] [Accepted: 01/16/2017] [Indexed: 11/28/2022]
Abstract
The new allele, B*55:81, differs from B*55:02:01:02 by 2 nucleotide substitutions in codon 116 (TTA → TAC).
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Affiliation(s)
- S-Y Ko
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, South Korea
| | - J Im
- Biowithus Life Science Institute, Seoul, Korea
| | - C K Lee
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, South Korea
| | - Y Cho
- Department of Laboratory Medicine, College of Medicine, Korea University, Seoul, South Korea
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21
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Jeong TD, Mun YC, Chung HS, Seo D, Im J, Huh J. Novel deletion mutation of HLA-B*40:02 gene in acquired aplastic anemia. HLA 2016; 89:47-51. [PMID: 28025876 DOI: 10.1111/tan.12943] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 07/29/2016] [Revised: 10/31/2016] [Accepted: 11/17/2016] [Indexed: 01/03/2023]
Abstract
Despite prevalence of clonal evolution in patients with aplastic anemia (AA), somatic mutation of human leukocyte antigen (HLA) gene is rarely reported. Herein, we reported a case of acquired AA (aAA) harboring a new four-base-pair deletion mutation within exon 4 of HLA-B*40:02 leading to frameshift and premature stop codon. The HLA-B*40:02 mutant allele was detected in the patient's peripheral blood sample not in patient's buccal epithelial cells. The patient received allogenic hematopoietic stem cell transplantation (HSCT) from HLA-matched sibling donor. On day 30 after HSCT, the mutant HLA allele was not detected by high-resolution sequence-based HLA typing. Serial chimerism analyses showed mixed chimeric status indicative of coexisting donor and recipient hematopoietic cells. Our data could provide additional support in view of pathophysiology of aAA that somatic mutation of HLA-B*40:02 allele is one of the possible origin of clonal escape to evade immune attack in patient with aAA.
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Affiliation(s)
- T-D Jeong
- Department of Laboratory Medicine, Ewha Womans University School of Medicine, Seoul, Korea
| | - Y-C Mun
- Division of Hematology & Oncology, Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea
| | - H-S Chung
- Department of Laboratory Medicine, Ewha Womans University School of Medicine, Seoul, Korea
| | - D Seo
- Department of Laboratory Medicine, Ewha Womans University School of Medicine, Seoul, Korea
| | - J Im
- Research and Development Team, Biowithus Life Science Institute, Seoul, Korea
| | - J Huh
- Department of Laboratory Medicine, Ewha Womans University School of Medicine, Seoul, Korea
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22
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Park BG, Cho J, Im J, Kwon OJ, Kim HS. Identification of a novel allele, HLA-A*26:01:01:03N, by full-length genome sequencing. HLA 2016; 88:260-261. [PMID: 27667496 DOI: 10.1111/tan.12901] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 09/04/2016] [Accepted: 09/06/2016] [Indexed: 11/30/2022]
Abstract
The HLA-A*26:01:01:03N allele shows a single nucleotide difference compared with HLA-A*26:01:01:01 in intron 4(1846 G>A).
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Affiliation(s)
- B G Park
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - J Cho
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - J Im
- Biowithus Life Science Institute, Seoul, Korea
| | - O-J Kwon
- Biowithus Life Science Institute, Seoul, Korea
| | - H-S Kim
- Department of Laboratory Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, South Korea.
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23
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Fang L, Im J, DeGottardi W, Jia Y, Glatz A, Matveev KA, Kwok WK, Crabtree GW, Kanatzidis MG. Large spin-orbit coupling and helical spin textures in 2D heterostructure [Pb 2BiS 3][AuTe 2]. Sci Rep 2016; 6:35313. [PMID: 27731394 PMCID: PMC5059675 DOI: 10.1038/srep35313] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 09/23/2016] [Indexed: 11/24/2022] Open
Abstract
Two-dimensional heterostructures with strong spin-orbit coupling have direct relevance to topological quantum materials and potential applications in spin-orbitronics. In this work, we report on novel quantum phenomena in [Pb2BiS3][AuTe2], a new 2D strong spin-orbit coupling heterostructure system. Transport measurements reveal the spin-related carrier scattering is at odds with the Abrikosov-Gorkov model due to strong spin-orbit coupling. This is consistent with our band structure calculations which reveal a large spin-orbit coupling gap of εso = 0.21 eV. The band structure is also characterized by helical-like spin textures which are mainly induced by strong spin-orbit coupling and the inversion symmetry breaking in the heterostructure system.
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Affiliation(s)
- L. Fang
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
- Advanced Material Division, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
| | - J. Im
- Chemistry Department, Northwestern University, Evanston, IL 60208, USA
| | - W. DeGottardi
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Y. Jia
- NUFAB, Northwestern University, Evanston, IL 60208, USA
| | - A. Glatz
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
- Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA
| | - K. A. Matveev
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - W.-K. Kwok
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - G. W. Crabtree
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
| | - M. G. Kanatzidis
- Materials Science Division, Argonne National Laboratory, Lemont, IL 60439, USA
- Advanced Material Division, Korea Research Institute of Chemical Technology, Daejeon 305-600, Korea
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24
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Lee JS, Kim MJ, Park SH, Lee SB, Wang T, Jung US, Im J, Kim EJ, Lee KW, Lee HG. Effects of dietary mixture of garlic (Allium sativum), coriander (Coriandrum sativum) and probiotics on immune responses and caecal counts in young laying hens. J Anim Physiol Anim Nutr (Berl) 2016; 101:e122-e132. [PMID: 27678135 DOI: 10.1111/jpn.12573] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 12/30/2015] [Accepted: 06/16/2016] [Indexed: 11/27/2022]
Abstract
This study was conducted to evaluate the effects of a combined mixture of phytogenic extracts (garlic and coriander) and probiotics on growth performance and immune responses in laying hens based on the results of in vitro studies to screen for immunomodulatory potency of each ingredient. Several parameters of immunomodulatory potency were estimated using lamina propria leucocytes (LPLs) isolated from rat intestinal mucosa tissue. Results show that the combined mixture enhanced LPLs proliferation, increased LPL-mediated cytotoxicity against YAC-1 tumour cells, and decreased lipopolysaccharide (LPS)-induced cytokine production including tumour necrosis factor-α (TNF-α) and interferon-γ (IFN-γ) in LPLs. For in vivo study, laying hens (n = 50/each diet group) were fed with control diet, a diet containing antibiotics (0.01% per kg feed) or the combined mixture (0.02% per kg feed) for 21 days. The dietary combined mixture improved egg production (p < 0.05) but not growth performance and carcass traits. Interestingly, the patterns of suppressing plasma IFN-γ productions during inflammation by LPS injection and decreasing caecal E. coli counts in the combined mixture group were comparable to those in the antibiotics group. Taken together, our results suggested that the 0.02% of combined mixture of phytogenic extracts and probiotics as ingredients has potential immunomodulatory effects in laying hens.
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Affiliation(s)
- J S Lee
- Department of Animal Science and Technology, College of Animal Bioscience & Technology, Konkuk University, Gwangjin-gu, Seoul, Korea.,Team of An Educational Program for Specialists in Global Animal Science, Brain Korea 21 Plus Project, Konkuk University, Gwangjin-gu, Seoul, Korea
| | - M J Kim
- Department of Animal Science and Technology, College of Animal Bioscience & Technology, Konkuk University, Gwangjin-gu, Seoul, Korea
| | - S H Park
- Department of Animal Science, College of Natural Resources and Life Science, Pusan National University, Gyeongnam, Korea
| | - S B Lee
- Department of Animal Science and Technology, College of Animal Bioscience & Technology, Konkuk University, Gwangjin-gu, Seoul, Korea
| | - T Wang
- College of Animal Science and Technology, Jilin Agricultural University, Changchun, China
| | - U S Jung
- Department of Animal Science and Technology, College of Animal Bioscience & Technology, Konkuk University, Gwangjin-gu, Seoul, Korea
| | - J Im
- Department of Medicine, University of Minnesota, Minneapolis, MN, USA
| | - E J Kim
- Division of Animal Husbandry, College of Chonan Yonam, Cheonan-si, Chungnam, Korea
| | - K W Lee
- Department of Animal Science and Technology, College of Animal Bioscience & Technology, Konkuk University, Gwangjin-gu, Seoul, Korea.,Team of An Educational Program for Specialists in Global Animal Science, Brain Korea 21 Plus Project, Konkuk University, Gwangjin-gu, Seoul, Korea
| | - H G Lee
- Department of Animal Science and Technology, College of Animal Bioscience & Technology, Konkuk University, Gwangjin-gu, Seoul, Korea.,Team of An Educational Program for Specialists in Global Animal Science, Brain Korea 21 Plus Project, Konkuk University, Gwangjin-gu, Seoul, Korea
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Abstract
Many satellite sensors including Landsat series have been extensively used for land cover classification. Studies have been conducted to mitigate classification problems associated with the use of single data (e.g., such as cloud contamination) through multi-sensor data fusion and the use of time series data. This study investigated two areas with different environment and climate conditions: one in South Korea and the other in US. Cropland classification was conducted by using multi-temporal Landsat 5, Radarsat-1 and digital elevation models (DEM) based on two machine learning approaches (i.e., random forest and support vector machines). Seven classification scenarios were examined and evaluated through accuracy assessment. Results show that SVM produced the best performance (overall accuracy of 93.87%) when using all temporal and spectral data as input variables. Normalized Difference Water Index (NDWI), SAR backscattering, and Normalized Difference Vegetation Index (NDVI) were identified as more contributing variables than the others for cropland classification.
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26
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Panzner U, Pak G, Meyer C, Ali M, Baker S, Clemens J, Fung Deerin J, Gasmelseed N, Im J, Keddy K, Gassama Sow A, Tall A, Park J, Wierzba T, Marks F. Typhoid fever surveillance in africa program (TSAP): Constructing a geospatial sampling frame for random sampling of households. Int J Infect Dis 2016. [DOI: 10.1016/j.ijid.2016.02.533] [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: 10/22/2022] Open
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27
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JEON E, Cho Y, Im J, Kim Y. Evaluation of outcome of esophageal arterial embolization during the transarterial embolization treatment of hemoptysis. J Vasc Interv Radiol 2016. [DOI: 10.1016/j.jvir.2015.12.163] [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: 10/22/2022] Open
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28
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Han E, Park SY, Im J, Lee EK. Decomposing Growth Of Diabetes Drug Expenditure In Korea. Value Health 2014; 17:A748. [PMID: 27202709 DOI: 10.1016/j.jval.2014.08.182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Affiliation(s)
- E Han
- Yonsei University, Incheon, South Korea
| | - S Y Park
- Sungkyunkwan University, Suwon, South Korea
| | - J Im
- Sungkyunkwan University, Suwon, South Korea
| | - E K Lee
- Sungkyunkwan University, Suwon, South Korea
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29
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Suh K, Kim K, Im J, Park J, Kim J, Choi I. Lung Cancer in Homeless People: Clinical Outcomes and Cost Analysis in a Single Institute. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu353.10] [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: 11/12/2022] Open
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Im J, Panzner U, von Kalckreuth V, Pak G, Cruz Espinoza L, Aaby P, Bjerregaard-Andersen M, Ali M, Gassama A, Schutt-Gerowitt H, Marks F, Wierzba T. Typhoid fever surveillance in Africa program: Carriers of invasive Salmonella in Africa survey (CISAS). Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.943] [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: 10/25/2022] Open
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32
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Im J, Choi Y, Seong J, Lee I, Park J, Yoon D, Kim K, Lee W. Higher Radiation Dose May Benefit Patients With Extrahepatic Bile Duct Cancer Undergoing Curative Resection. Int J Radiat Oncol Biol Phys 2012. [DOI: 10.1016/j.ijrobp.2012.07.875] [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: 10/27/2022]
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Cho E, Im J, Park C, Son WJ, Kim DH, Horii H, Ihm J, Han S. Atomic and electronic structures of amorphous Ge(2)Sb(2)Te(5); melt-quenched versus ideal glasses. J Phys Condens Matter 2010; 22:205504. [PMID: 21393709 DOI: 10.1088/0953-8984/22/20/205504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
To investigate an amorphous structure of Ge(2)Sb(2)Te(5) that satisfies the 8-N rule (so-called 'ideal glass'), we perform alternative melt-quench simulations on Si(2)As(2)Se(5) and replace atoms in the final structure with Ge-Sb-Te. The resulting structures have salient features of the 8-N rule such as the tetrahedral configuration for all Ge atoms and the localized Te lone pairs at the valence top. In addition, the average Ge-Te and Sb-Te distances are in good agreement with experiment. The energetic stability of the ideal glass supports the existence of this amorphous structure that is distinct from the melt-quenched glass. From the analysis of electronic structures and optical dielectric constants, it is concluded that the electronic character of the melt-quenched amorphous Ge(2)Sb(2)Te(5) lies in between the resonant p-bonding of the crystalline phase and the covalent bonding of the ideal glass.
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Affiliation(s)
- E Cho
- Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Korea
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34
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Haig AJ, Im J, Adewole A, Nelson VS, Krabak B. The practice of physical medicine and rehabilitation in subSaharan Africa and Antarctica: a white paper or a black mark? Eur J Phys Rehabil Med 2009; 45:185-191. [PMID: 19347003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
AIM The medical specialty of physical medicine and rehabilitation (PM&R) has had a proven impact on persons with disability and on healthcare systems. Documents such as The White Book on Physical and Rehabilitation Medicine in Europe have been important in defining the scope of practice within various regions. However on some continents the practice has not been well defined. The aim of this paper was to explore the practice of PM&R in subSaharan Africa and Antarctica. METHODS Medline searches, membership data searches, fax survey of medical schools, Internet searches, and interviews with experts. RESULTS The continents are dissimilar in terms of climate and government; However, both Antarctica and subSaharan Africa have no PM&R training programs, no professional organizations, no specialty board requirements, and no practicing physicians in the field. Since there are no known disabled children on Antarctica and adults are airlifted to world-class health care, the consequences of this deficit are minimal there. However the 788,000,000 permanent residents of subSaharan Africa including approximately 78 million persons with disability are left unserved. CONCLUSIONS Antarctica is doing fine. Africa is in a crisis. Local medical schools, hospitals doctors, and persons with disability; along with foreign volunteers, aid groups, and policymakers can impact the crisis. However government specifically national ministries of health is ultimately responsible for the health and wellbeing of citizens.
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Affiliation(s)
- A J Haig
- Department of Physical Medicine and Rehabilitation, The University of Michigan Ann Arbor, MI Haji , USA.
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35
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Im J, Moon S, Nam K, Kim YJ, Kim JY. Estimation of mass transport parameters of gases for quantifying CH4 oxidation in landfill soil covers. Waste Manag 2009; 29:869-875. [PMID: 18804363 DOI: 10.1016/j.wasman.2008.07.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2007] [Revised: 05/26/2008] [Accepted: 07/01/2008] [Indexed: 05/26/2023]
Abstract
Methane (CH(4)), which is one of the most abundant anthropogenic greenhouse gases, is produced from landfills. CH(4) is biologically oxidized to carbon dioxide, which has a lower global warming potential than methane, when it passes through a cover soil. In order to quantify the amount of CH(4) oxidized in a landfill cover soil, a soil column test, a diffusion cell test, and a mathematical model analysis were carried out. In the column test, maximum oxidation rates of CH(4) (V(max)) showed higher values in the upper part of the column than those in the lower part caused by the penetration of O(2) from the top. The organic matter content in the upper area was also higher due to the active microbial growth. The dispersion analysis results for O(2) and CH(4) in the column are counter-intuitive. As the upward flow rate of the landfill gas increased, the dispersion coefficient of CH(4) slightly increased, possibly due to the effect of mechanical dispersion. On the other hand, as the upward flow rate of the landfill gas increased, the dispersion coefficient of O(2) decreased. It is possible that the diffusion of gases in porous media is influenced by the counter-directional flow rate. Further analysis of other gases in the column, N(2) and CO(2), may be required to support this hypothesis, but in this paper we propose the possibility that the simulations using the diffusion coefficient of O(2) under the natural condition may overestimate the penetration of O(2) into the soil cover layer and consequently overestimate the oxidation of CH(4).
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Affiliation(s)
- J Im
- Department of Civil and Environmental Engineering, College of Engineering, Seoul National University, Seoul, Republic of Korea
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36
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Lee J, Jin Y, Lim Y, Yu J, Lee J, Tudev M, Im J, Park E, Kim T, Lee M, Yun Y. ANTIPLATELET ACTIVITY OF FENOFIBRATE, A PPARALPHA AGONIST, WAS MEDIATED BY BLOCKING OF CYTOSOLIC CALCIUM MOBILIZATION AND THROMBOXANE A2 RECEPTOR. J Thromb Haemost 2007. [DOI: 10.1111/j.1538-7836.2007.tb02384.x] [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: 11/29/2022]
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37
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Lee M, Im J, Lee BY, Myung S, Kang J, Huang L, Kwon YK, Hong S. Linker-free directed assembly of high-performance integrated devices based on nanotubes and nanowires. Nat Nanotechnol 2006; 1:66-71. [PMID: 18654144 DOI: 10.1038/nnano.2006.46] [Citation(s) in RCA: 105] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2006] [Accepted: 07/31/2006] [Indexed: 05/06/2023]
Abstract
Advanced electronic devices based on carbon nanotubes (NTs) and various types of nanowires (NWs) could have a role in next-generation semiconductor architectures. However, the lack of a general fabrication method has held back the development of these devices for practical applications. Here we report an assembly strategy for devices based on NTs and NWs. Inert surface molecular patterns were used to direct the adsorption and alignment of NTs and NWs on bare surfaces to form device structures without the use of linker molecules. Substrate bias further enhanced the amount of NT and NW adsorption. Significantly, as all the processing steps can be performed with conventional microfabrication facilities, our method is readily accessible to the present semiconductor industry. We use this method to demonstrate large-scale assembly of NT- and NW-based integrated devices and their applications. We also provide extensive analysis regarding the reliability of the method.
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Affiliation(s)
- M Lee
- School of Physics, Seoul National University, Kwanak-Gu, Shilim-Dong, Seoul 151-747, Korea
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38
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Lee. M, Yi H, Song E, Im M, Im J, Lee B, Kim C. Three-day regimen of fluorouracil and cisplatin combination chemotherapy for persistence, metastatic or recurrent uterine cervical cancer. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.15049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
15049 Background: The five-day infusion of FP(5-fluorouracil, cisplatin) combination therapy is one of the most popular regimens for advanced cervical cancer, which has yield a 50∼60% response rate. There is some variance in the FP combination, for example, longer infusion of FP requiring longer hospitalization as well as causing more discomfort to the patients. This study was designed to assess the therapeutic effect and toxicities of three day regimen of FP combination chemotherapy instead of five day regimen for disseminated or recurrent cervical cancer. Methods: From July 1996 through April 2001, 39 patients with advanced or recurrent cervical cancer were enrolled in the study. The regimen consisted of continuous 12-hour infusion of 5-FU(5-fluorouracil) at 1000 mg/m2/day plus bolus infusion of cisplatin at 25mg/m2/day for 3 days. The treatment was repeated every 3 weeks. Results: Thirty five patients with a median age of 53 years were evaluable for response during the median follow up of 21.5 months. The response rate was 45.7% (4 CR and 12 PR), and the median duration of the overall survival was 45 months. Toxicity was acceptable with no treatment related mortality. Neutropenia in grade 3 or more was seen in 16% with 4 febrile episodes throughout a total 232 cycles. It did not appear alopecia and gastointestinal trouble in grade 3 or more. Conclusions: These results revealed that the toxicity of 3 day regimen of 5-FU and cisplatin is acceptable and the efficacy comparable to that of 5 day regimen. No significant financial relationships to disclose.
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Affiliation(s)
- M. Lee.
- Inha University Hospital, Incheon, Republic of Korea
| | - H. Yi
- Inha University Hospital, Incheon, Republic of Korea
| | - E. Song
- Inha University Hospital, Incheon, Republic of Korea
| | - M. Im
- Inha University Hospital, Incheon, Republic of Korea
| | - J. Im
- Inha University Hospital, Incheon, Republic of Korea
| | - B. Lee
- Inha University Hospital, Incheon, Republic of Korea
| | - C. Kim
- Inha University Hospital, Incheon, Republic of Korea
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Choi S, Kim K, Bok J, Im J, Kim H. 266Sperm quality according to the disease and treatment pre stem cell transplantation. Biol Blood Marrow Transplant 2003. [DOI: 10.1016/s1083-8791(03)80251-3] [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: 11/16/2022]
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Abstract
Previous research has demonstrated that blood flow and subsequent O2 desaturation (OD) in exercising muscle is related to the static component during exercise. In speed skating, increased OD is dissociated from whole body VO2 and heart rate (HR) when the skater increases the static component by 'sitting low'. This phenomenon was evaluated in cross-country skiers by manipulating speed and incline during treadmill roller skiing. Eight male cross-country skiers (22.4 +/- 3.2 yrs old) randomly performed constant incline- and constant speed-based protocols in which increased load was manipulated in five 4min stages by treadmill incline or speed change, respectively. A strong relationship (r = 0.83) was observed between VO2 and % OD while blood volume change (deltaBV) was minimal. Unexpectedly, no HR/ VO2 or HR/OD shifts were observed between protocols. The % OD response, in relation to blood lactate values, during submaximal exercise was very similar to that of VO2. The lack of an observed greater desaturation at higher inclines suggests that the expected static load may be attenuated by an increased contribution of poling. The strong relationship of % OD to whole body VO2 may be attributed to O2 dissociation in the capillary bed of the muscle to meet aerobic energy demand and is independent of blood flow dynamics during cross-country ski skating.
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Affiliation(s)
- J Im
- Sport Science and Technology Division United States Olympic Committee, Lake Placid, NY 12946, USA
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Abstract
PURPOSE To investigate muscle blood volume (BV) change and hemoglobin/myoglobin oxygen desaturation (OD) during simulated giant slalom (GS) and slalom (SL) Alpine ski racing. METHODS Joint angle, BV, OD, and heart rate (HR) were evaluated during GS and SL events in 30 junior elite skiers ages 9--17 yr (13.5 +/- 2.3). Subjects were stratified by ski class and age: group I, J1 and J2, ages 15--18 yr (16.8 +/- 0.8); group II, J3, 13--14 yr (13.6 +/- 0.7); and group III, J4 and J5, 9--12 yr (11.5 +/- 1.2). Near-infrared spectrophotometry (NIRS) was used to measure BV and OD in the capillary bed of the vastus lateralis during trials. Maximal OD was determined during thigh cuff ischemia (CI). Quadriceps cross-sectional area (CSA) was estimated by skin-fold and thigh circumference. RESULTS Joint angles were smaller (P < 0.05) during GS than SL for ankle (83.8 +/- 11.9 degrees; 98.6 +/- 15.7 degrees ), knee (107.4 +/- 14.9 degrees; 118.3 +/- 18.0 degrees ), and hip (98.8 +/- 14.3 degrees; 107.5 +/- 16.2 degrees ). BV reduction from rest to peak exercise (Delta BV) was 30% greater (P < 0.05) during the GS than SL, whereas Delta OD was 33% greater (P < 0.05) during GS. Delta OD, relative to CI OD, was greater for all subjects during GS (79.2 +/- 3.7%) than SL (65.7 +/- 4.4%). This pattern continued within groups; group II displayed the greatest relative desaturation (82.9 +/- 7.6%). CSA was larger in older skiers (92.5 +/- 21.6; 72.5 +/- 12.3; 65.3 +/- 21.2 cm(2)) and correlated with Delta OD (P < 0.05). CONCLUSION The larger reduction in BV (Delta BV change) and greater OD when skiers assumed lower posture during GS than SL may be related to greater effective static load secondary to higher percent of maximal voluntary contraction and is consistent with compromised blood flow to working muscle.
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Affiliation(s)
- L Szmedra
- Bloomsburg University of Pennsylvania, Bloomsburg, PA, USA
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Abstract
PURPOSE The purpose of this study was to compare self-reported symptoms for exercise-induced asthma (EIA) to postexercise challenge pulmonary function test results in elite athletes. METHODS Elite athletes (N = 158; 83 men and 75 women; age: 22 +/- 4.4 yr) performed pre- and post-exercise spirometry and were grouped according to postexercise pulmonary function decrements (PFT-positive, PFT-borderline, and PFT-normal for EIA). Before the sport/environment specific exercise challenge, subjects completed an EIA symptoms-specific questionnaire. RESULTS Resting FEV1 values were above predicted values (114--121%) and not different between groups. Twenty-six percent of the study population demonstrated >10% postexercise drop in FEV1 and 29% reported two or more symptoms. However, the proportion of PFT-positive and PFT-normal athletes reporting two or more symptoms was not different (39% vs. 41%). Postrace cough was the most reported symptom, reported significantly more frequently for PFT-positive athletes (P < 0.05). Sensitivity/specificity analysis demonstrated a lack of effectiveness of self-reported symptoms to identify PFT-positive or exclude PFT-normal athletes. Postexercise lower limit reference ranges (MN-2SDs) were determined from normal athletes for FEV1, FEF25--75% and PEF to be -7%, -12.5%, and -18%, respectively. CONCLUSION Although questionnaires provide reasonable estimates of EIA prevalence among elite cold-weather athletes, the use of self-reported symptoms for EIA diagnosis in this population will likely yield high frequencies of both false positive and false negative results. Diagnosis should include spirometry using an exercise/environment specific challenge in combination with the athlete's history of asthma symptoms.
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Affiliation(s)
- K W Rundell
- Sports Science and Technology Division, United States Olympic Committee, Lake Placid, NY 12946, USA.
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Abstract
PURPOSE The purpose of this project was to determine the incidence of exercise-induced bronchospasm (EIB) among U.S. Olympic winter sport athletes. METHODS Subjects included female and male members of the 1998 U.S. Winter Olympic Team from the following sports: biathlon, cross-country ski, figure skating, ice hockey, Nordic combined, long-track speedskating, and short-track speedskating. Assessment of EIB was conducted in conjunction with an "actual competition" (Olympic Trials, World Team Trials, World Cup Event, U.S. National Championships) or a "simulated competition" (time trial, game), which served as the exercise challenge. Standard spirometry tests were performed preexercise and at 5, 10, and 15 min postexercise. An athlete was considered EIB-positive based on a postexercise decrement in FEV1 > or = 10%. RESULTS For the seven sports evaluated on the 1998 U.S. Winter Olympic Team, the overall incidence of EIB across all sports and genders was 23%. The highest incidence of EIB was found in cross-country skiers, where 50% of the athletes (female = 57%; male = 43%) were diagnosed with EIB. Across the seven sports evaluated, the prevalence of EIB among the female and male athletes was 26% and 18%, respectively. Among those individuals found to be EIB-positive were athletes who won a team gold medal, one individual silver medal, and one individual bronze medal at the Nagano Winter Olympics. CONCLUSIONS These data suggest that: 1) EIB is prevalent in several Olympic winter sports and affects nearly one of every four elite winter sport athletes; 2) the winter sport with the highest incidence of EIB is cross-country skiing; 3) in general, EIB is more prevalent in female versus male elite winter sport athletes; and 4) athletes may compete successfully at the international level despite having EIB.
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Affiliation(s)
- R L Wilber
- United States Olympic Committee, Sport Science and Technology Division, Colorado Springs, CO 80909, USA.
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Lee J, Hong H, Im J, Byun H, Kim D. The formation of PHF-1 and SMI-31 positive dystrophic neurites in rat hippocampus following acute injection of okadaic acid. Neurosci Lett 2000; 282:49-52. [PMID: 10713393 DOI: 10.1016/s0304-3940(00)00863-6] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Within neurofibrillary tangles and dystrophic neurites of Alzheimer's disease (AD), tau protein is hyperphosphorylated. In the present study, we provide evidence that acute injection of okadaic acid (1 mM, 0.5 microliter) into the dorsal hippocampus induces the formation of paired helical filament (PHF)-1, sternberger monoclonals incorporated (SMI)-31, and amyloid precursor protein (APP) positive dystrophic neurites in the lacunosum-molecular layer of CA1 and molecular layer of dentate gyrus. Okadaic acid evoked a marked loss of microtubule associated protein (MAP)-2 immunoreactivity. PHF-1 immunoreactive terminals were fine, and SMI-31 immunoreactive terminals appeared at granular terminals and at the ring-like or elongated dystrophic neurites. APP positive dystrophic neurites exhibited large bulb-like globular terminals. Interestingly, APP dystrophic neurites were co-localized with SMI-31 immunoreactivity in the core. APP immunoreactivity became stronger over 24 h even in vehicle injected area. These results may provide the morphological evidence for the animal model to study dystrophic neurites formation of AD.
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Affiliation(s)
- J Lee
- Department of Anatomy, College of Medicine, University of Ulsan, 388-1 PoongNap-Dong, SongPa-Gu, Seoul, South Korea
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Rundell KW, Wilber RL, Szmedra L, Jenkinson DM, Mayers LB, Im J. Exercise-induced asthma screening of elite athletes: field versus laboratory exercise challenge. Med Sci Sports Exerc 2000; 32:309-16. [PMID: 10694112 DOI: 10.1097/00005768-200002000-00010] [Citation(s) in RCA: 135] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
PURPOSE The purpose of this study was to compare a laboratory based exercise challenge (LBC) to a field based exercise challenge (FBC) for pulmonary function test (PFT) exercise-induced asthma (EIA) screening of elite athletes. METHODS Twenty-three elite cold weather athletes (14 men, 9 women) PFT positive for EIA (FBC screened) served as subjects. Twenty-three gender and sport matched controls (nonasthmatics) were randomly selected to establish PFT reference values for normal elite athletes. Before FBC, athletes completed a medical history questionnaire for EIA symptoms. FBC evaluations consisted of baseline spirometry, actual or simulated competition, and 5, 10, and 15 min postexercise spirometry. PFT positive athletes were evaluated in the laboratory using an exercise challenge simulating race intensity (ambient conditions: 21 degrees C, 60% relative humidity). PFT procedures were identical to FBC. RESULTS 91% of PFT positive and 48% of PFT normal athletes reported at least one symptom of EIA, with postrace cough most frequent. Baseline spirometry was the same for PFT positives and normal controls. Lower limit reference range (MN - 2 SD) of FEV1 for controls suggests that postexercise decrements of greater than approximately -7% indicate abnormal airway response in this population. Exercise time duration did not effect bronchial reactivity; 78% of FBC PFT positives were PFT normal post-LBC. CONCLUSION Self-reported symptoms by elite athletes are not reliable in identifying EIA. Reference range criterion for FEV1 decrement in the elite athlete postexercise contrasts current recommended guidelines. Moreover, a large number of false negatives may occur in this population if EIA screening is performed with inadequate exercise and environmental stress.
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Affiliation(s)
- K W Rundell
- Sport Science and Technology Division, United States Olympic Committee, Lake Placid, NY 12946, USA.
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Ferro LA, Im J, Iverson P, Kennedy D, McCallian DJ, Parisi J. Developing and implementing pharmacy-based asthma services. J Am Pharm Assoc (Wash) 1998; 38:551-65; quiz 565-6. [PMID: 9782689 DOI: 10.1016/s1086-5802(16)30380-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- L A Ferro
- Kaiser Permanente Santa Clara Medical Center, USA
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Yogev D, Watson-McKown R, Rosengarten R, Im J, Wise KS. Increased structural and combinatorial diversity in an extended family of genes encoding Vlp surface proteins of Mycoplasma hyorhinis. J Bacteriol 1995; 177:5636-43. [PMID: 7559353 PMCID: PMC177375 DOI: 10.1128/jb.177.19.5636-5643.1995] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.6] [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: 01/25/2023] Open
Abstract
Variable lipoproteins (Vlp) constitute the major coat protein of Mycoplasma hyorhinis. They are products of multiple, divergent, single-copy genes organized in a chromosomal cluster. Three genes, vlpA, vlpB, and vlpC, have been previously identified in clonal isolates of M. hyorhinis SK76. Each is linked to a characteristic promoter region containing a homopolymeric tract of adenine residues [poly(A) tract], subject to hypermutation, that transcriptionally controls phase variation of vlp genes and leads to combinatorial surface mosaics of distinct Vlp products. The size of the natural vlp gene repertoire is unknown but may critically determine the degree of structural and combinatorial diversity available in this species. In this study, the vlp repertoire of M. hyorhinis GDL-1 was characterized and shown to contain three additional genes, vlpD, vlpE, and vlpF, clustered with other known vlp genes in the order 5'-vlpD-vlpE-vlpF-IS-vlpA-IS-vlpB-vlpC+ ++-3', where IS represents copies of the IS1221 element of M. hyorhinis. The 5' boundary of this expanded family was identical to that of the more limited family 5'-vlpA-IS-vlpB-vlpC-3' previously described in a clonal isolate of strain SK76. A recombinant construct containing vlpD, vlpE, and vlpF expressed antigenically distinguishable products corresponding to each gene. These genes encode characteristic C-terminal repetitive regions that are subject to size variation by insertion or deletion of intragenic repeats but maintain an extended, charged structure. Each vlp gene also contained characteristic alternative open reading frames, which provide a potential reservoir of coding sequence for Vlp diversity, possibly recruited through insertion and/or deletion mutations. These findings demonstrate a vastly expanded potential for structural diversity and combinatorial display of surface mosaics on this organism and suggest that modulation of the vlp repertoire, possibly in conjunction with mobile elements, may determine the capacity for surface variation in natural populations and laboratory strains of this mycoplasma species.
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Affiliation(s)
- D Yogev
- Department of Molecular Microbiology and Immunology, School of Medicine, University of Missouri, Columbia 65212, USA
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Rhoads LS, Danks AM, Im J, Warner A, Isaacson RL, Baust J, Van Buskirk RG. Extracellular calcium does not contribute to cryopreservation-induced cytotoxicity. In Vitro Cell Dev Biol 1993; 29A:208-14. [PMID: 8463185 DOI: 10.1007/bf02634185] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The possible role of extracellular calcium ([Ca+2]e) in cryopreservation-induced cytotoxicity was tested using Madin-Darby canine kidney (MDCK) cells and a fluorescent multiple endpoint assay. MDCK cells maintained in 2 mM [Ca+2]e and treated with the calcium ionophore, ionomycin, increased their intracellular calcium ([Ca+2]i) as revealed by the calcium indicator dye, Fluo3 and the bottom-reading spectrofluorometer, CytoFluor 2300. The addition of 10 mM [ethylene bis (oxyethylenenitrilo)]-tetraacetic acid (EGTA) to the extracellular medium before treatment with ionomycin blocked this ionomycin-dependent increase in [Ca+2]i. A number of site and activity-specific fluorescent probes were surveyed to determine which indicator dye might best reveal the ionomycin-induced cytotoxic events during this increase in [Ca+2]i. Although most dyes changed their emission profiles in response to calcium, neutral red was found to best reflect the loss of [Ca+2]i homeostasis. The NR50 for a 15-min exposure to ionomycin in the presence of 2 mM [Ca+2]e was approximately 2 microM ionomycin, but ionomycin had little apparent effect on neutral red retention when 10 mM EGTA was added to the extracellular medium. Thus it was clear that an increase in [Ca+2]i could be cytotoxic to MDCK cells and that neutral red could monitor this cytotoxic episode. To test if [Ca+2]e was similarly cytotoxic during cryopreservation, MDCK cells were subjected to cryopreservation in the presence of dimethylsulfoxide (DMSO). In contrast to previous studies, plasma membrane integrity, not lysosomal function, seemed to best correlate with cell survival subsequent to cryopreservation. In addition, decreasing [Ca+2]e had no discernable effect on the retention of plasma membrane indicator dyes, neutral red, or cell survival. It is concluded that a) plasma membrane indicator dyes, not neutral red, might be better indicators of cytotoxicity occurring during cryopreservation; b) DMSO might be toxic to lysosomes during cryopreservation of cultured cells; and c) although [Ca+2]e can contribute to cytotoxicity, the presence of [Ca+2]e might not influence cryopreservation-induced cytotoxicity.
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Affiliation(s)
- L S Rhoads
- Department of Biological Sciences, State University of New York, Binghamton 13902
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Ma M, Im J, Hiltner A, Baer E. Fatigue crack propagation in microlayer composites of polycarbonate and poly(styrene–acrylonitrile). J Appl Polym Sci 1990. [DOI: 10.1002/app.1990.070400504] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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