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Yoon SH, Lee S, Lee SY, Moon B. Effect of precursors and stress factors on yeast isolated from fermented maesil extract and their biogenic amine formation. Food Sci Biotechnol 2024; 33:211-218. [PMID: 38186610 PMCID: PMC10766930 DOI: 10.1007/s10068-023-01328-8] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 03/24/2023] [Accepted: 04/26/2023] [Indexed: 01/09/2024] Open
Abstract
Biogenic amines are produced during fermentation and can act as harmful substances. Strains related to the fermentation of maesil extract were identified and Clavispora lusitaniae and Pichia kluyveri were selected to investigate the relationship between biogenic amines and precursors, NaCl or ethanol. Biogenic amines were analyzed by high-performance liquid chromatography. Among precursors added, arginine was most effective for the biogenic amines formation. After 24 h incubation, the content of total biogenic amines increased from 37.60 to 51.75 mL/L for C. lusitaniae and from 2.60 to 33.30 mL/L for P. kluyveri in arginine-added medium. The number of yeast decreased in both NaCl- and ethanol-YM broth added with arginine, but there was no correlation between the number of yeast and biogenic amines. These results suggested that the formation of biogenic amines by yeast was affected by various factors and their interactions rather than a single factor, such as decarboxylase activity and stress factor. Supplementary Information The online version contains supplementary material available at 10.1007/s10068-023-01328-8.
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Affiliation(s)
- So Hee Yoon
- Department of Food and Nutrition, Chung-Ang University, 72-1, Nae-Ri, Daedeok-Myeon, Anseong-Si, Gyeonggi-Do 17546 Republic of Korea
| | - Sanghyeon Lee
- Department of Food and Nutrition, Chung-Ang University, 72-1, Nae-Ri, Daedeok-Myeon, Anseong-Si, Gyeonggi-Do 17546 Republic of Korea
| | - Sun-Young Lee
- Department of Food and Nutrition, Chung-Ang University, 72-1, Nae-Ri, Daedeok-Myeon, Anseong-Si, Gyeonggi-Do 17546 Republic of Korea
| | - BoKyung Moon
- Department of Food and Nutrition, Chung-Ang University, 72-1, Nae-Ri, Daedeok-Myeon, Anseong-Si, Gyeonggi-Do 17546 Republic of Korea
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Lee J, Kim JE, Lee S, Lee TK, Kim IH, Yoon SH, Yoo M, Lee E, Hwang DY, Kang SH, Ku BS, Lee DW, Park YS, K JW, Kim JW, Ahn SH, Lee KW, Kim HH, Oh HJ, Suh YS. Abstract 5322: High throughput chemotherapeutic drug screening system for gastric cancer: cure-GA. Cancer Res 2023. [DOI: 10.1158/1538-7445.am2023-5322] [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: 04/07/2023]
Abstract
Abstract
To discover clinically applicable anticancer drugs and predict therapeutic response for advanced gastric cancer, we developed a high-throughput drug (HTD) screening system that could rapidly evaluate drug reactivity using 3D cultured primary cells derived from gastric cancer (GC) patients. Primary cancer cells were isolated from fresh surgical specimens that resected from 143 GC patients using Gentle Max tissue dissociation system. Primary cells were mixed with Matrigel, and placed on a micropillar for three-dimensional (3D) culture. After the primary cells were stabilized in the complete culture medium (CCM) than added various chemotherapeutic drugs containing 5-FU, Oxaliplatin, and Paclitaxel in CCM and incubated for 7 days. Cell viability was determined through calcein staining and quantified scanned images. The IC50 for each drug was calculated by a sigmoidal dose-response curve, using the GraphPad Prism 9 program. The average weight of gastric cancer tissue used in the experiment was 300 mg (75 mg ~ 1930 mg), and the average number of dissociated viable cells for each tissue was 3.9 × 10^6 cells/case. About 2.4 × 10^5 live cell was required per drug, we were able to obtain an average of 6.4 (Min.2, Max 14) drug reactivity data per tissue using the HTD screening system. GC tissues obtained from the operating room were dissociated within 16 hours and then loaded into the HTS system within 3 hours. Cells were stabilized for 1 day in 3D culture plate and exposed to the drug for 7 days, and then data reports were made within 3 days. As a result, it was possible to obtain within 14 days from fresh surgical GC tissue to drug response data. Additionally, we confirmed that 3D cultured primary cells derived from GC tissues consistently preserved primary characters using IHC. Similar to their parental cancer tissue, GC 3D cultured primary cells derived from adenocarcinoma large glandular patterns and retain the expression of some marker proteins. In this study, we evaluated the drug response data for 101 cases (success rate 71%; 101/143) to 5-FU, Oxaliplatin, and Palitaxel, etc. using the HTD screening system and it was confirmed that individual patient had a difference response to each drug. Here we established the HTD screening system using 3D cultured GC patient derived primary cells. The advantages of this system were that it is the first model system that directly used patient-derived primary cells for drug screening, and it can rapidly evaluate drug reactivity to various anticancer drugs within 10 days. The HTD screening system based on patient-derived primary cells can provide that information to predict drug response and allow for finding more appropriate therapy for each patient.
Citation Format: Jieun Lee, Jung Eun Kim, Sanjun Lee, Tae-Kyeong Lee, In Hee Kim, So Hee Yoon, Mira Yoo, Eunju Lee, Doo-Young Hwang, So Hyun Kang, Bo Sung Ku, Dong Woo Lee, Young Suk Park, Ji-Won K, Jin Won Kim, Sang-Hoon Ahn, Keun-Wook Lee, Hyung-Ho Kim, Hyun Jung Oh, Yun-Suhk Suh. High throughput chemotherapeutic drug screening system for gastric cancer: cure-GA. [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2023; Part 1 (Regular and Invited Abstracts); 2023 Apr 14-19; Orlando, FL. Philadelphia (PA): AACR; Cancer Res 2023;83(7_Suppl):Abstract nr 5322.
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Affiliation(s)
- Jieun Lee
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Jung Eun Kim
- 2Medical & Bio Decision (MBD Co., Ltd.), Gyeonggi-do, Republic of Korea
| | - Sanjun Lee
- 3Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea
| | - Tae-Kyeong Lee
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - In Hee Kim
- 2Medical & Bio Decision (MBD Co., Ltd.), Gyeonggi-do, Republic of Korea
| | - So Hee Yoon
- 2Medical & Bio Decision (MBD Co., Ltd.), Gyeonggi-do, Republic of Korea
| | - Mira Yoo
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Eunju Lee
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Doo-Young Hwang
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - So Hyun Kang
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Bo Sung Ku
- 2Medical & Bio Decision (MBD Co., Ltd.), Gyeonggi-do, Republic of Korea
| | - Dong Woo Lee
- 2Medical & Bio Decision (MBD Co., Ltd.), Gyeonggi-do, Republic of Korea
| | - Young Suk Park
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Ji-Won K
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Jin Won Kim
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Sang-Hoon Ahn
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Keun-Wook Lee
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Hyung-Ho Kim
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Hyun Jung Oh
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
| | - Yun-Suhk Suh
- 1Seoul National University Bundang Hospital, Gyeonggi-do, Republic of Korea
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Yoon SH, Han CH, Eun S. Impact of the COVID-19 pandemic on the incidence of intussusception: a systematic review. Eur Rev Med Pharmacol Sci 2022; 26:9040-9049. [PMID: 36524523 DOI: 10.26355/eurrev_202212_30579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
OBJECTIVE We aimed to assess the impact of the coronavirus disease 2019 (COVID-19) pandemic on the incidence of intussusception. MATERIALS AND METHODS Literature search of the PubMed and EMBASE databases was conducted for articles published in English until August 5, 2022. RESULTS Overall, 127 articles were retrieved, and five studies from South Korea (n=4) and the United States of America (n=1) containing clinical data from single-center medical records to nationwide databases were ultimately included in the systematic review. All the included studies reported that the incidence of intussusception decreased significantly during the pandemic period compared with the pre-pandemic period. The communicable disease incidence tended to decrease even as the incidence of non-communicable diseases did not significantly change. There was no significant difference in the time to diagnosis between the pre-pandemic and pandemic periods; however, the time to radiologic reduction was significantly longer or not depending on the study. CONCLUSIONS The COVID-19 pandemic significantly reduced the incidence of intussusception in children, supporting the hypothesis that infection plays a major role in the etiology of intussusception. Future studies in the late pandemic or post-pandemic era, which would represent the level of implementation of non-pharmaceutical interventions and social distancing as well as additional data from various countries will be needed.
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Affiliation(s)
- S H Yoon
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
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Kim BG, Yuk JS, Kim GS, Seo JK, Jin MN, Lee HY, Seo YS, Kim MH, Yang SW, Yoon SH, Byun YS, Kim BO. Effect of early hysterectomy on a risk of incident cardiovascular disease in women: a nationwide population-based cohort study. Eur Heart J 2022. [DOI: 10.1093/eurheartj/ehac544.2495] [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: 11/14/2022] Open
Abstract
Abstract
Aim
Women who inevitably underwent surgical hysterectomy before natural menopause may have an earlier increase in hematocrit and storage iron than women who continue menstruation, thereby increasing the risk of cardiovascular disease (CVD) early. We aimed to evaluate the association of women with hysterectomy vs. without hysterectomy before their 50s with the risk of incident CVD.
Methods
This was a retrospective-cohort study, 135,575 women aged 40 to 50 years in 2011–2014 were extracted from the Korean Health Insurance Review and Assessment Service data and after propensity score matching, 55,539 pairs were included in hysterectomy and non-hysterectomy group respectively. The primary endpoint was major adverse cardiac and cerebrovascular events (MACCE), a composite of cardiovascular death, myocardial infarction (MI), stroke, and coronary artery revascularization.
Results
After adjustment for confounding factors, hysterectomy group had an increased risk of MACCE compared with non-hysterectomy group (hazard ratio [HR], 1.25; 95% confidence interval [CI], 1.09–1.44). Regarding individual outcomes, cardiovascular death, MI, and coronary revascularization were comparable between the groups, whereas, the risk of stroke was significantly higher in hysterectomy group than non-hysterectomy group (HR, 1.31; 95% CI, 1.12–1.53). Even after excluding women who underwent oophorectomy, hysterectomy group had a higher risk of MACCE than non-hysterectomy group (HR, 1.24; 95% CI 1.06–1.44).
Conclusions
Early surgical menopause due to hysterectomy, not hormonal menopause, was associated with an increased risk for a composite of CVD, especially stroke. This suggest that the role of “uterus” as well as sex hormones may be important for the sharp increase in the risk of CVD in women after menopause.
Funding Acknowledgement
Type of funding sources: None.
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Affiliation(s)
- B G Kim
- Inje University Sanggye Paik Hospital, Cardiology , Seoul , Korea (Republic of)
| | - J S Yuk
- Sanggye Paik Hospital, Obstetrics and Gynecology , Seoul , Korea (Republic of)
| | - G S Kim
- Inje University Sanggye Paik Hospital, Cardiology , Seoul , Korea (Republic of)
| | - J K Seo
- Inje University Sanggye Paik Hospital, Cardiology , Seoul , Korea (Republic of)
| | - M N Jin
- Inje University Sanggye Paik Hospital, Cardiology , Seoul , Korea (Republic of)
| | - H Y Lee
- Inje University Sanggye Paik Hospital, Cardiology , Seoul , Korea (Republic of)
| | - Y S Seo
- Sanggye Paik Hospital, Obstetrics and Gynecology , Seoul , Korea (Republic of)
| | - M H Kim
- Sanggye Paik Hospital, Obstetrics and Gynecology , Seoul , Korea (Republic of)
| | - S W Yang
- Sanggye Paik Hospital, Obstetrics and Gynecology , Seoul , Korea (Republic of)
| | - S H Yoon
- Sanggye Paik Hospital, Obstetrics and Gynecology , Seoul , Korea (Republic of)
| | - Y S Byun
- Inje University Sanggye Paik Hospital, Cardiology , Seoul , Korea (Republic of)
| | - B O Kim
- Inje University Sanggye Paik Hospital, Cardiology , Seoul , Korea (Republic of)
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Yoon SH, Kim H, Lim SM, Kang JM. Nosocomial outbreak of Achromobacter spp. bacteremia due to germicide contamination: a systematic review. Eur Rev Med Pharmacol Sci 2022; 26:6374-6381. [PMID: 36111940 DOI: 10.26355/eurrev_202209_29664] [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] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
OBJECTIVE Achromobacter spp. are aerobic, non-fermentative Gram-negative bacilli that can be widely found in aquatic environments. Nosocomial outbreaks and pseudo-outbreaks of Achromobacter spp. bacteremia have been recognized for decades. Notably, commonly used germicides in hospital settings constitute important sources for these outbreaks. This review aims at summarizing the latest studies and presents the characteristics of nosocomial outbreaks of Achromobacter spp. bacteremia caused by germicide contamination. MATERIALS AND METHODS A systematic search of the PubMed and EMBASE databases was conducted for articles published in English between January 1, 2000, and June 10, 2022. RESULTS Overall, 170 articles were retrieved, and 7 studies were finally included in the systematic review. Whether true or pseudo-bacteremia, positive blood culture results were most commonly reported in immunosuppressed patients or those with indwelling catheters. The most commonly reported contaminated germicide was chlorhexidine solution used as both an antiseptic and disinfectant. Atomizers, dispensers, and various product containers were identified as reservoirs. The prognoses of the affected patients were generally favorable. CONCLUSIONS Awareness about the high survival ability of Achromobacter spp. in germicides and the possible hospital reservoirs of these microbes will help to improve infection control and prevent nosocomial outbreaks or pseudo-outbreaks caused by Achromobacter spp.
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Affiliation(s)
- S H Yoon
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
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Yoon SH, Choi B, Eun S, Bae GE, Koo CM, Kim MK. Using the lactate-to-albumin ratio to predict mortality in patients with sepsis or septic shock: a systematic review and meta-analysis. Eur Rev Med Pharmacol Sci 2022; 26:1743-1752. [PMID: 35302224 DOI: 10.26355/eurrev_202203_28244] [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] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
OBJECTIVE This study aimed to investigate whether the lactate-to-albumin ratio (LAR) can predict mortality in patients with sepsis or septic shock. PATIENTS AND METHODS A systematic search of the PubMed, EMBASE, Web of Science, and Google Scholar databases was conducted on December 16, 2021, for relevant articles that provided the predictive performance of LAR for mortality in patients with sepsis or septic shock. RESULTS Eight studies encompassing a total of 4,723 patients were included in this paper. The pooled sensitivity, specificity, and diagnostic odds ratio of the LAR for predicting mortality were 0.71 (95% confidence interval [CI]: 0.54-0.84), 0.68 (95% CI: 0.58-0.76) and 5.23 (95% CI: 2.62-10.45), respectively. The area under the summary receiver operating characteristic curve was 0.74 (95% CI: 0.70-0.78). CONCLUSIONS The current evidence suggests that LAR is moderately predictive of mortality among patients with sepsis or septic shock and may be beneficial to identify high-risk patients.
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Affiliation(s)
- S H Yoon
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
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Eun S, Ho IG, Bae GE, Kim H, Koo CM, Kim MK, Yoon SH. Neutrophil-to-lymphocyte ratio for the diagnosis of pediatric acute appendicitis: a systematic review and meta-analysis. Eur Rev Med Pharmacol Sci 2021; 25:7097-7107. [PMID: 34859875 DOI: 10.26355/eurrev_202111_27263] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE Acute appendicitis (AA) is one of the most common surgical emergencies and causes of acute abdominal pain in the pediatric population. However, it can be difficult to diagnose in children. We aimed to provide updated evidence on the diagnostic utility of the neutrophil-to-lymphocyte ratio (NLR) for AA, along with other conventional biomarkers, in pediatric patients. MATERIALS AND METHODS We searched the PubMed, Embase, Cochrane Library, and Web of Science databases for eligible articles published up to May 16, 2021. RESULTS We included 19 studies comprising a total of 5,974 pediatric cases. The overall sensitivity and specificity of the NLR were 0.82 (95% confidence interval [CI]: 0.79-0.85) and 0.76 (95% CI: 0.69-0.81), respectively. The overall diagnostic odds ratio was 14.34 (95% CI: 9.05-22.73). The area under the summary receiver operating characteristic curve was 0.86 (95% CI: 0.83-0.89). The pooled sensitivity and specificity of other biomarkers were as follows: 0.79 (95% CI: 0.71-0.86) and 0.66 (95% CI: 0.54-0.77) for the white blood cell count, 0.73 (95% CI: 0.69-0.77) and 0.68 (95% CI: 0.55-0.79) for the C-reactive protein level, 0.75 (95% CI: 0.65-0.82) and 0.78 (95% CI: 0.72-0.83) for the absolute neutrophil count, and 0.83 (95% CI: 0.79-0.87) and 0.68 (95% CI: 0.53-0.80) for the neutrophil percentage, respectively. CONCLUSIONS The NLR has moderate predictive power for AA and can be used as a simple, auxiliary tool for diagnosis. NLR can also help clinicians decide whether to perform imaging testing when the clinical symptoms or physical examination findings are vague.
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Affiliation(s)
- S Eun
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea.
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Lambert FN, Gracy HR, Gracy AJ, Yoon SH, Scott RW, Rincon DM, Vulpe CD. Effects of ultraviolet-filters on Daphnia magna development and endocrine-related gene expression. Aquat Toxicol 2021; 238:105915. [PMID: 34329859 DOI: 10.1016/j.aquatox.2021.105915] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 06/23/2021] [Accepted: 07/14/2021] [Indexed: 06/13/2023]
Abstract
Ultraviolet (UV) filters are emerging contaminants of concern that are widely spread throughout the aquatic environment. Many organic UV filters are endocrine disrupting compounds (EDCs) in vertebrates. However, few studies have assessed their effects on invertebrates. Molting, or the shedding of the exoskeleton, may be affected by exposure to these compounds in Arthropods (the largest phylum of invertebrates). Molting is necessary for growth and development and is regulated by an arthropod specific endocrine system, the ecdysteroid pathway. Alterations of this process by EDCs can result in improper development, reduced growth, and even death. We investigated the sublethal effects of chronic exposure to three organic UV filters (4-methylbenzylidene camphor (4MBC), octylmethoxycinnamate (OMC), and benzophenone-3 (BP3) in a crustacean, Daphnia magna, with particular emphasis on molting and development. We demonstrate that 4MBC, OMC, and BP3 affect development and long-term health in neonates of exposed parents at concentrations of 130 µg/L, 75 µg/L, and 166 µg/L, respectively. Additionally, the expression of endocrine-related genes (including ultraspiracle protein, usp) are significantly altered by 4MBC and BP3 exposure, which may relate to their developmental toxicity.
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Affiliation(s)
- F N Lambert
- Center for Environmental and Human Toxicology, University of Florida.
| | - H R Gracy
- Center for Environmental and Human Toxicology, University of Florida
| | - A J Gracy
- Center for Environmental and Human Toxicology, University of Florida
| | - S H Yoon
- Center for Environmental and Human Toxicology, University of Florida
| | - R W Scott
- Center for Environmental and Human Toxicology, University of Florida
| | - D M Rincon
- Center for Environmental and Human Toxicology, University of Florida
| | - C D Vulpe
- Center for Environmental and Human Toxicology, University of Florida
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Yoon SH, Gao J, Xu L, Yu Z, Jiang T, Kang BK, Zhang R, Cao D. Effect of additive-assisted fat transplantation on fat graft survival rate: A preliminary experimental study based on a rabbit animal model. ANN CHIR PLAST ESTH 2021; 66:440-446. [PMID: 33966905 DOI: 10.1016/j.anplas.2021.03.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 02/26/2021] [Revised: 03/24/2021] [Accepted: 03/29/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND Improving the survival rate of fat grafts is yet a difficult problem in the field of autologous fat transplantation. Prevailing methods such as making nanofat and SVF are time-consuming. Hence, the role of additives application in the improvement of fat graft survival during fat transplantation was considered and preliminarily evaluated in a rabbit animal model. METHODS A rabbit animal model was established where rabbit ears were injected with a mixture of 1.5mL of adipose tissue and 1mL of saline (group A), 1.5mL of adipose tissue and 1mL of botulinum toxin A (BoNTA) (group B), 1.5mL of adipose tissue and 1mL of prostaglandin E2 (groupC), 1.5mL of adipose tissue and 1mL of PDRN (group D) respectively. Then, the extents of neovascularization and inflammation were evaluated on the 7th, 14th, 28th, 42nd, 56th and 70th day after injection by ELISA assays and H&E and immunofluorescence staining. RESULTS The results showed that pre-treatment with BoNTA, prostaglandin E2 and PDRN improved graft volume and weight. The H&E and immunofluorescence staining revealed that BoNTA, prostaglandin E2 and PDRN improved the graft angiogenesis. Simultaneously, TNF-α expression level detected by ELISA was the lowest in the PDRN group. CONCLUSION Henceforth, the present preliminary study suggests that pre-transplantation treatment with BoNTA, prostaglandin E2 and PDRN can improve the fat graft angiogenesis and graft integrity, whereby the effect of adding PDRN may be significant.
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Affiliation(s)
- S H Yoon
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China
| | - J Gao
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China
| | - L Xu
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China
| | - Z Yu
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China
| | - T Jiang
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China
| | - B K Kang
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China
| | - R Zhang
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China.
| | - D Cao
- Department of plastic and reconstructive surgery, Shanghai Ninth People's Hospital, Shanghai JiaoTong University school of medicine, 639, Zhizaoju road, 200011 Shanghai, China.
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Yoon SH, Yang S, Cho H, Eun S, Koo CM, Kim MK. Point-of-care testing for the detection of SARS-CoV-2: a systematic review and meta-analysis. Eur Rev Med Pharmacol Sci 2021; 25:503-517. [PMID: 33506942 DOI: 10.26355/eurrev_202101_24422] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To evaluate the diagnostic accuracy of the Food and Drug Administration Emergency Use Authorization (FDA-EUA) authorized point-of-care tests (POCTs) for the detection of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). MATERIALS AND METHODS A systematic literature search was conducted using the PubMed, Embase, and Web of Science databases for articles published till August 10, 2020. We included studies providing information regarding diagnostic test accuracy of FDA-EUA POCTs for SARS-CoV-2 detection. The methodologic quality was assessed using the Quality Assessment of Diagnostic Accuracy Studies-2 tool. The review protocol is registered in the International Prospective Register of Systematic Reviews (protocol number CRD42020202248). RESULTS We included 26 studies describing a total of 3242 samples. The summary sensitivity and specificity were 0.94 [95% confidence interval (CI): 0.88-0.97] and 1.00 (95% CI: 0.99-1.00), respectively. The area under the summary receiver operating characteristic curve was 1.00 (95% CI: 0.99-1.00). A pooled analysis based on the index test revealed a summary sensitivity and specificity of Cepheid Xpert Xpress SARS-CoV-2 [0.99 (95% CI: 0.97-1.00) and 0.99 (95% CI: 0.94-1.00, respectively)] and ID NOW COVID-19 [0.78 (95% CI: 0.74-0.82) and 1.00 (95% CI: 0.98-1.00), respectively]. CONCLUSIONS FDA-EUA POCTs, especially molecular assays, have high sensitivity, specificity, and overall diagnostic accuracy for detecting SARS-CoV-2. If approved, FDA-EUA POCTs can provide a rapid and practical way to identify infected individuals early on and help to limit the strain on the healthcare system. However, more high-quality clinical data are required to support our results.
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Affiliation(s)
- S H Yoon
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, South Korea.
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Sung P, Yoon SH, Kim J, Hong JH, Park S, Goo JM. Bronchovascular bundle thickening on CT as a predictor of survival and brain metastasis in patients with stage IA peripheral small cell lung cancer. Clin Radiol 2020; 76:76.e37-76.e46. [PMID: 32948314 DOI: 10.1016/j.crad.2020.08.018] [Citation(s) in RCA: 1] [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] [Received: 04/29/2020] [Accepted: 08/19/2020] [Indexed: 01/03/2023]
Abstract
AIM To determine if bronchovascular bundle (BVB) thickening on pretreatment computed tomography (CT) images helps predict survival in patients with peripheral small cell lung cancer (pSCLC) ≤3 cm. MATERIALS AND METHODS The pretreatment CT examinations of 79 histopathologically proven pSCLC ≤3 cm (TNM stage I, 21; II, 13; III, 22; IV, 23) were reviewed retrospectively. The CT characteristics of the nodule and associated findings, including BVB thickening, were evaluated. Progression-free survival (PFS), overall survival (OS), and brain metastasis-free survival were compared with the presence of BVB thickening using Kaplan-Meier and Cox regression analysis. RESULTS Among the 79 patients, 34 (43%) had BVB thickening. BVB thickening was prevalent in patients with mediastinal lymph node metastasis (50.9% versus 22.7%; p=0.024) and distant metastasis (60.9% versus 35.7%; p=0.049). Out of the 21 patients with TNM stage IA disease, the 16 patients (76.2%) without BVB thickening showed better PFS, OS, and brain metastasis-free survival (mean, 1,762 versus 483 days; p=0.019: 2,243 versus 1,328 days; p=0.038: 2,274 versus 1,287 days; p=0.038, respectively). Multivariate Cox regression analysis showed that the absence of BVB thickening (hazard ratio [HR], 7.806; 95% CI, 1.241-49.091; p=0.029) and surgery (HR, 0.075; 95% CI, 0.008-0.746; p=0.027) were independent and useful prognostic factors for PFS. CONCLUSIONS BVB thickening was found more frequently in patients with advanced-stage pSCLC ≤3 cm, and the PFS was more favourable in patients without BVB thickening, with a similar tendency to that of OS and brain metastasis-free survival, in stage IA pSCLC.
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Affiliation(s)
- P Sung
- Department of Radiology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
| | - S H Yoon
- Department of Radiology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea; Department of Radiology, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 030804, South Korea.
| | - J Kim
- Department of Radiology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, Gyeonggi-do, 13620, South Korea
| | - J H Hong
- Department of Radiology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
| | - S Park
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, South Korea
| | - J M Goo
- Department of Radiology, Seoul National University Hospital, 101 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea; Department of Radiology, Seoul National University College of Medicine, 103 Daehak-ro, Jongno-gu, Seoul, 030804, South Korea; Institute of Radiation Medicine, Seoul National University Medical Research Center, 103 Daehak-ro, Jongno-gu, Seoul, 03080, South Korea
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12
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Yoon SH, Kang JM, Ahn JG. Clinical outcomes of 201 neonates born to mothers with COVID-19: a systematic review. Eur Rev Med Pharmacol Sci 2020; 24:7804-7815. [PMID: 32744708 DOI: 10.26355/eurrev_202007_22285] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To evaluate the clinical manifestations and outcomes of neonates born to women who had Coronavirus Disease 2019 (COVID-19) during pregnancy. MATERIALS AND METHODS A systematic literature search was conducted on PubMed and Embase till April 15, 2020, by combining the terms (COVID-19, Severe Acute Respiratory Syndrome Coronavirus 2, SARS-CoV-2, Novel Coronavirus, 2019-nCov, Wuhan pneumonia) and (pregnancy, pregnant women, mother, fetus, neonate, newborn, infant). RESULTS We included 16 case series and 12 case reports describing a total of 223 pregnant women and 201 infants. Four newborns born to mothers affected by COVID-19 were reported to have laboratory-confirmed Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) infection within 48 hours after birth. However, Reverse Transcription-Polymerase Chain Reaction tests of the breast milk, placenta, amniotic fluids, and cord blood and maternal vaginal secretions were all negative for SARS-CoV-2 in the reported cases. Fetal death was reported in two cases, and 48 of 185 newborns (25.9%) were born prematurely. Infants born small for gestational age and low birth weight (< 2,500 g) accounted for 8.3% and 15.6% of reported cases, respectively. Birth asphyxia and respiratory distress syndrome were observed in 1.8% and 6.4% of neonates, respectively. There was one neonatal death due to intractable gastric bleeding among the SARS-CoV-2-negative infants. CONCLUSIONS Current evidence suggests that COVID-19 during pregnancy rarely affects fetal and neonatal mortality, but can be associated with adverse neonatal morbidities. Vertical transmission has not been observed in the majority of the reported cases. The infants born to mothers with COVID-19 are carefully monitored for accompanying complication, and quarantine of infected mothers is warranted.
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Affiliation(s)
- S H Yoon
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, Korea.
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13
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Han S, Yoon SH, Goo JM, Yim JJ. Radiological features and progression of incipient active pulmonary tuberculosis according to risk factors. Int J Tuberc Lung Dis 2020; 23:698-706. [PMID: 31315702 DOI: 10.5588/ijtld.18.0541] [Citation(s) in RCA: 5] [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: 01/27/2023] Open
Abstract
<sec> <title>OBJECTIVES</title> To examine the radiological features of incipient active pulmonary tuberculosis (PTB) in humans and evaluate radiological progression according to risk factors. </sec> <sec> <title>DESIGN</title> We retrospectively included 66 non-human immunodeficiency virus patients with bacteriologically proven PTB who had diagnostic and incidental pre-diagnostic computed tomography (CT) scans. CT scans were reviewed using a scoring system that included typical and atypical abnormalities associated with PTB. Risk factors for progression were assessed and, based on these, the CT features and progression of TB were compared using regression analyses. </sec> <sec> <title>RESULTS</title> The most prevalent CT finding in incipient PTB was a well-defined solid nodule in upper lobes and lower lobe superior segments. The non-risk and at-risk groups did not differ in terms of the proportion of individuals with nodules and segmental location. The at-risk group had a higher incidence of progression (adjusted odds ratio 8.59), greater increment in the CT score (adjusted regression coefficient [aRC] 9.19) and a higher proportion of atypical CT abnormalities on diagnostic CT scans (aRC 13.15). </sec> <sec> <title>CONCLUSION</title> Incipient active PTB primarily manifested as a small nodule in humans regardless of risk factors. With risk factors, it progressed more frequently and rapidly into active disease, with a higher prevalence of atypical radiological manifestations. </sec>.
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Affiliation(s)
- S Han
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul
| | - S H Yoon
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul
| | - J M Goo
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Institute of Radiation Medicine, Seoul National University Medical Research Center
| | - J-J Yim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Seoul National University College of Medicine, Seoul, South Korea
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14
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Yoon SH, Koh E, Choi B, Moon B. Effects of Soaking and Fermentation Time on Biogenic Amines Content of Maesil ( Prunus Mume) Extract. Foods 2019; 8:foods8110592. [PMID: 31752430 PMCID: PMC6915678 DOI: 10.3390/foods8110592] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 11/14/2019] [Accepted: 11/15/2019] [Indexed: 11/16/2022] Open
Abstract
Maesil extract, a fruit-juice concentrate derived from Prunus mume prepared by fermenting with sugar, is widely used with increasing popularity in Korea. Biogenic amines in maesil extract were extracted with 0.4 M perchloric acid, derivatized with dansyl chloride, and detected using high-performance liquid chromatography. Among 18 home-made maesil extracts collected from different regions, total biogenic amine content varied from 2.53 to 241.73 mg/L. To elucidate the effects of soaking and fermentation time on biogenic amine content in maesil extract, maesil was soaked in brown sugar for 90 days and the liquid obtained was further fermented for 180 days at 15 and 25 °C, respectively. The main biogenic amines extracted were putrescine and spermidine and the total biogenic amine content was higher at 25 °C than at 15 °C. Soaking at 15 and 25 °C increased the total biogenic amines content from 14.14 to 34.98 mg/L and 37.33 to 69.05 mg/L, respectively, whereas a 180 day fermentation decreased the content from 31.66 to 13.59 mg/L and 116.82 to 57.05 mg/L, respectively. Biogenic amine content was correlated with total amino acid content (particularly, arginine content). Based on these results, we have considered that biogenic amine synthesis can be reduced during maesil extract production by controlling temperature and fermentation time.
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Affiliation(s)
- So Hee Yoon
- Department of Food and Nutrition, Chung-Ang University, Gyeonggi-do 17546, Korea;
| | - Eunmi Koh
- Major of Food & Nutrition, Division of Applied Food System, Seoul Women’s University, Seoul 01797, Korea; (E.K.); (B.C.)
| | - Bogyoung Choi
- Major of Food & Nutrition, Division of Applied Food System, Seoul Women’s University, Seoul 01797, Korea; (E.K.); (B.C.)
| | - BoKyung Moon
- Department of Food and Nutrition, Chung-Ang University, Gyeonggi-do 17546, Korea;
- Correspondence: ; Tel.: +82-31-670-3273
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15
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Lee SY, Kang DY, Kim JY, Yoon SH, Choi YH, Lee W, Cho SH, Kang HR. Incidence and Risk Factors of Immediate Hypersensitivity Reactions Associated With Low-Osmolar Iodinated Contrast Media: A Longitudinal Study Based on a Real-Time Monitoring System. J Investig Allergol Clin Immunol 2019; 29:444-450. [PMID: 30676320 DOI: 10.18176/jiaci.0374] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [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: 11/20/2022] Open
Abstract
OBJECTIVES We investigated the incidence of immediate hypersensitivity reaction (HSR) caused by different types of low-osmolar contrast media (LOCM) and cumulative exposure to LOCM. METHODS This cohort study included all consecutive patients who underwent LOCM-enhanced computed tomography from 2012 through 2014. We assessed 5 LOCM (iobitridol, iohexol, iomeprol, iopamidol, and iopromide). All patients were monitored for adverse events, and new symptoms and signs were recorded in real time using the Contrast Safety Monitoring and Management System (CoSM2oS). RESULTS The overall incidence of immediate HSR to LOCM was 0.97% (2004 events resulting from 205 726 exposures). Incidence differed significantly depending on whether the patient had a previous history of HSR to LOCM (0.80% in patients with no history and 16.99% in patients with a positive history of HSR to LOCM, P=.001). The incidence of HSR to individual LOCM ranged from 0.72% (iohexol) to 1.34% (iomeprol), although there were no significant differences across the 5 LOCM. A longitudinal analysis demonstrated that the incidence of HSR increased gradually with more frequent previous exposure to LOCM (HR=2.006 [95%CI, 1.517-2.653], P<.001). However, this cumulative increase in risk was observed in patients who had experienced HSR to LOCM, but not in those who had not. CONCLUSION The incidence of HSR did not differ significantly across the 5 LOCM assessed in the study. Repeated exposure to LOCM did not increase the risk of HSR among patients who had never experienced HSR to LOCM.
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Affiliation(s)
- S Y Lee
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.,Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - D Y Kang
- Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea
| | - J Y Kim
- Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea
| | - S H Yoon
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
| | - Y H Choi
- Department of Radiology, Seoul National University College of Medicine, Seoul, Korea
| | - W Lee
- Department of Internal Medicine, Gyeongsang National University Changwon Hospital, Changwon, Korea
| | - S H Cho
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.,Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.,Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea
| | - H R Kang
- Institute of Allergy and Clinical Immunology, Seoul National University Medical Research Center, Seoul, Korea.,Division of Allergy and Clinical Immunology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea.,Drug Safety Monitoring Center, Seoul National University Hospital, Seoul, Korea
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16
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Yeo HJ, Lee S, Yoon SH, Lee SE, Cho WH, Jeon D, Kim YS, Kim D. Extracorporeal Life Support as a Bridge to Lung Transplantation in Patients With Acute Respiratory Failure. Transplant Proc 2018; 49:1430-1435. [PMID: 28736018 DOI: 10.1016/j.transproceed.2017.02.064] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2016] [Revised: 02/10/2017] [Accepted: 02/23/2017] [Indexed: 12/12/2022]
Abstract
BACKGROUND Extracorporeal membrane oxygenation (ECMO) is being used more often as a bridge to transplantation (BTT) in patients with acutely decompensated end-stage lung disease in Korea. ECMO as a BTT may be the only rescue strategy for severe acute respiratory failure, but many centers still consider it to be a relative contraindication to lung transplantation because of its poor outcome. Because there are not enough lung donors, it is important to determine their optimal use. We reviewed and analyzed our experiences with the use of ECMO as a BTT in patients with acute respiratory failure. METHODS This was a retrospective analysis of all patients with acutely decompensated end-stage lung disease treated with ECMO as a bridge to lung transplantation between March 2012 and February 2016. RESULTS Of the 194 patients who underwent respiratory ECMO over a 4-year period, a BTT strategy was used for 19 patients (median age, 58 years) on our institution's lung transplantation waiting list (15 veno-venous, 3 veno-veno-arterial, 1 veno-arterial). Fourteen patients (73.7%) were successfully bridged to transplantation; however, 3 died while on the waiting list and 2 returned to their baseline functions without transplantation. The overall in-hospital survival rate was 57.9% (11 of 19), including the 9 (64.3%) patients who underwent transplantation. CONCLUSIONS Our findings support the view that well-selected candidates with acutely decompensated end-stage lung disease may be safely bridged until a suitable donor is identified. ECMO is not able to reverse the course of patients; however, it could be a life-saving option for patients with acute respiratory failure requiring lung transplantation.
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Affiliation(s)
- H J Yeo
- Department of Pulmonology and Critical Care Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - S Lee
- Department of Pulmonology and Critical Care Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - S H Yoon
- Department of Pulmonology and Critical Care Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - S E Lee
- Department of Pulmonology and Critical Care Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - W H Cho
- Department of Pulmonology and Critical Care Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - D Jeon
- Department of Pulmonology and Critical Care Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - Y S Kim
- Department of Pulmonology and Critical Care Medicine, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea
| | - D Kim
- Department of Thoracic and Cardiovascular Surgery, Pusan National University, Yangsan Hospital, Yangsan, Republic of Korea.
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17
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Sol IS, Kim YH, Park YA, Lee KE, Hong JY, Kim MN, Kim YS, Oh MS, Yoon SH, Kim MJ, Kim KW, Sohn MH, Kim KE. Relationship between sputum clusterin levels and childhood asthma. Clin Exp Allergy 2017; 46:688-95. [PMID: 26661728 DOI: 10.1111/cea.12686] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [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: 04/06/2015] [Revised: 11/27/2015] [Accepted: 12/05/2015] [Indexed: 12/25/2022]
Abstract
BACKGROUND Clusterin is a sensitive cellular biosensor of oxidative stress and has been studied as a biomarker for inflammation-associated diseases. Clusterin levels in childhood asthma have not been evaluated. OBJECTIVES (1) To evaluate sputum clusterin levels in children with asthma compared to a control group. (2) To assess the relationships between sputum clusterin levels and airway inflammation, pulmonary function, and bronchial hyperresponsiveness. METHODS This study included 170 children aged 5-18 years with stable asthma (n = 91), asthma exacerbation (n = 29), or no asthma (healthy controls; n = 50). Induced sputum, pulmonary function, and methacholine challenge tests were performed. Stable asthma was classified into two groups according to the severity. Clusterin levels in sputum were measured using an enzyme-linked immunosorbent assay. RESULTS Children with stable asthma had a higher clusterin level than healthy controls [4540 (3872-5651) pg/mL vs. 3857 (1054-4369) pg/mL, P < 0.001]. The clusterin level was also more elevated in eosinophil-dominant sputum than in non-eosinophilic sputum in stable asthma [5094 (4243-6257) pg/mL vs. 4110 (1871-4839) pg/mL, P = 0.0017]. Clusterin levels were associated with asthma severity. Paradoxically, clusterin levels were lower during asthma exacerbation than in stable asthma [1838 (350-4790] pg/mL vs. 4540 (3872-5651) pg/mL, P < 0.001]. Clusterin levels were strongly correlated with the methacholine concentration that caused a 20% decrease in the forced expiratory volume in 1 s (r = -0.617, P < 0.001); there was no significant correlation between clusterin levels and other pulmonary function parameters. CONCLUSIONS AND CLINICAL RELEVANCE Clusterin levels were altered in children with stable asthma and asthma exacerbation because of its antioxidant and anti-inflammatory effects. Clusterin may be a marker that reflects airway inflammation and severity of symptoms, and it can be used in the assessment and management of childhood asthma.
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Affiliation(s)
- I S Sol
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Y H Kim
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Y A Park
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - K E Lee
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - J Y Hong
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - M N Kim
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - Y S Kim
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - M S Oh
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - S H Yoon
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - M J Kim
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - K W Kim
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - M H Sohn
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
| | - K E Kim
- Department of Pediatrics, Severance Hospital, Institute of Allergy, Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea
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18
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Bae YS, Yoon SH, Han JY, Woo J, Cho YS, Kwon SK, Bae YC, Kim D, Kim E, Kim MH. Deficiency of aminopeptidase P1 causes behavioral hyperactivity, cognitive deficits, and hippocampal neurodegeneration. Genes Brain Behav 2017; 17:126-138. [PMID: 28834604 DOI: 10.1111/gbb.12419] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 08/14/2017] [Accepted: 08/21/2017] [Indexed: 12/14/2022]
Abstract
Metabolic diseases affect various organs including the brain. Accumulation or depletion of substrates frequently leads to brain injury and dysfunction. Deficiency of aminopeptidase P1, a cytosolic proline-specific peptidase encoded by the Xpnpep1 gene, causes an inborn error of metabolism (IEM) characterized by peptiduria in humans. We previously reported that knockout of aminopeptidase P1 in mice causes neurodevelopmental disorders and peptiduria. However, little is known about the pathophysiological role of aminopeptidase P1 in the brain. Here, we show that loss of aminopeptidase P1 causes behavioral and neurological deficits in mice. Mice deficient in aminopeptidase P1 (Xpnpep1-/- ) display abnormally enhanced locomotor activities in both the home cage and open-field box. The aminopeptidase P1 deficiency in mice also resulted in severe impairments in novel-object recognition, the Morris water maze task, and contextual, but not cued, fear memory. These behavioral dysfunctions were accompanied by epileptiform electroencephalogram activity and neurodegeneration in the hippocampus. However, mice with a heterozygous mutation for aminopeptidase P1 (Xpnpep1+/- ) exhibited normal behaviors and brain structure. These results suggest that loss of aminopeptidase P1 leads to behavioral, cognitive and neurological deficits. This study may provide insight into new pathogenic mechanisms for brain dysfunction related to IEMs.
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Affiliation(s)
- Y-S Bae
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - S H Yoon
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - J Y Han
- Neuroscience Research Institute, Seoul National University Medical Research Center, Seoul, Korea
| | - J Woo
- Department of Biological Sciences, KAIST, Daejeon, Korea
| | - Y S Cho
- Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - S-K Kwon
- Department of Biological Sciences, KAIST, Daejeon, Korea.,Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea
| | - Y C Bae
- Department of Anatomy and Neurobiology, School of Dentistry, Kyungpook National University, Daegu, Korea
| | - D Kim
- Department of Biological Sciences, KAIST, Daejeon, Korea
| | - E Kim
- Department of Biological Sciences, KAIST, Daejeon, Korea.,Center for Synaptic Brain Dysfunctions, Institute for Basic Science (IBS), Daejeon, Korea
| | - M-H Kim
- Department of Physiology and Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea.,Neuroscience Research Institute, Seoul National University Medical Research Center, Seoul, Korea.,Seoul National University Bundang Hospital, Seongnam, Gyeonggi, Korea
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19
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Yi S, Lee H, Jang SB, Byun HM, Yoon SH, Cho JY, Jang IJ, Yu KS. A novel K+ competitive acid blocker, YH4808, sustains inhibition of gastric acid secretion with a faster onset than esomeprazole: randomised clinical study in healthy volunteers. Aliment Pharmacol Ther 2017; 46:337-346. [PMID: 28543183 DOI: 10.1111/apt.14148] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [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] [Received: 05/13/2016] [Revised: 06/06/2016] [Accepted: 04/25/2017] [Indexed: 12/26/2022]
Abstract
BACKGROUND YH4808, a K+ -competitive acid blocker, is under clinical development for the treatment of acid-related disorders, such as gastroesophageal reflux disease. AIMS To determine the safety, tolerability, pharmacokinetics (PK), and pharmacodynamics (PD) of YH4808, compared to placebo and esomeprazole. METHODS This double-blind, randomised, placebo- and active comparator (esomeprazole)-controlled study was conducted with 123 healthy male volunteers. We evaluated YH4808 (30-800 mg) properties, administered in single (N=55) and multiple (N=24) oral doses, and recorded the effects on 24-hour intragastric acidity. Results were compared to placebo (N=20) and esomeprazole 40 mg (N=24). RESULTS Plasma YH4808 exposure increased dose-proportionally and declined in a multi-phasic manner. YH4808 ≥200 mg/d maintained intragastric acidity at pH >4 for longer times than esomeprazole during both day and night (%Time at pH >4: >70% vs 58% of a 24-hour period, respectively; and >50% vs 33% of a 9-hour night respectively). A twice-daily regimen of YH4808 more effectively controlled intragastric pH at night than a once-daily regimen. In evaluating the mean areas under the intragastric pH-time curves in 15-minute intervals for 2 hours after dosing, we found that YH4808 had a faster onset than esomeprazole. Moreover, unlike esomeprazole, YH4808 PK and PD were not significantly affected by the CYP2C19 genotype of the subjects. YH4808 was well-tolerated at all doses administered. CONCLUSION This study showed that YH4808 produced a rapid, sustained suppression of gastric secretion with good tolerability. The results at YH4808 ≥200 mg/d provide a rationale for further clinical investigations in populations with acid-related diseases.
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Affiliation(s)
- S Yi
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - H Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea.,Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Republic of Korea
| | - S B Jang
- Department of Research and Development, Yuhan Co. Ltd., Seoul, Republic of Korea
| | - H M Byun
- Department of Research and Development, Yuhan Co. Ltd., Seoul, Republic of Korea
| | - S H Yoon
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - J-Y Cho
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - I-J Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - K-S Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
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20
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Ryu MY, Lee MA, Ahn YH, Kim KS, Yoon SH, Snyder EY, Cho KG, Kim SU. Brain Transplantation of Neural Stem Cells Cotransduced with Tyrosine Hydroxylase and GTP Cyclohydrolase 1 in Parkinsonian Rats. Cell Transplant 2017; 14:193-202. [PMID: 15929554 DOI: 10.3727/000000005783983133] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [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: 01/05/2023] Open
Abstract
Neural stem cells (NSCs) of the central nervous system (CNS) recently have attracted a great deal of interest not only because of their importance in basic research on neural development, but also in terms of their therapeutic potential in neurological diseases, such as Parkinson's disease (PD). To examine if genetically modified NSCs are a suitable source for the cell and gene therapy of PD, an immortalized mouse NSC line, C17.2, was transduced with tyrosine hydroxylase (TH) gene and with GTP cyclohydrolase 1 (GTPCH1) gene, which are important enzymes in dopamine biosynthesis. The expression of TH in transduced C17.2-THGC cells was confirmed by RT-PCR, Western blot analysis, and immunocytochemistry, and expression of GTPCH1 by RT-PCR. The level of L-DOPA released by C17.2-THGC cells, as determined by HPLC assay, was 3793 pmol/106 cells, which is 760-fold higher than that produced by C17.2-TH cells, indicating that GTPCH1 expression is important for L-DOPA production by transduced C17.2 cells. Following the implantation of C17.2-THGcC NSCs into the striata of parkinsonian rats, a marked improvement in amphetamine-induced turning behavior was observed in parkinsonian rats grafted with C17.2-THGC cells but not in the control rats grafted with C17.2 cells. These results indicate that genetically modified NSCs grafted into the brain of the parkinsonian rats are capable of survival, migration, and neuronal differentiation. Collectively, these results suggest that NSCs have great potential as a source of cells for cell therapy and an effective vehicle for therapeutic gene transfer in Parkinson's disease.
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Affiliation(s)
- M Y Ryu
- Department of Neurosurgery, Ajou University School of Medicine, Suwon, Korea
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Kim YW, Kim JH, Yoon SH, Lee JH, Lee CH, Shin CS, Park YS. Vertebral bone attenuation on low-dose chest CT: quantitative volumetric analysis for bone fragility assessment. Osteoporos Int 2017; 28:329-338. [PMID: 27480628 DOI: 10.1007/s00198-016-3724-2] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Accepted: 07/26/2016] [Indexed: 01/09/2023]
Abstract
UNLABELLED This study evaluated the use of low-dose chest computed tomography (LDCT) for detecting bone fragility. LDCT-measured vertebral bone attenuation by volumetric methods showed good correlation with bone mineral density (BMD) measured by dual-energy x-ray absorptiometry (DXA, and good diagnostic performance for identifying osteoporosis and compression fractures. The results of this study suggest the feasibility of obtaining comprehensive information on bone health in subjects undergoing LDCT. INTRODUCTION Osteoporosis is a prevalent but underdiagnosed disease that increases fracture risk. This study evaluated the utility of vertebral attenuation derived from low-dose chest computed tomography (LDCT) compared to dual-energy x-ray absorptiometry (DXA) for detecting bone fragility. METHODS A total of 232 subjects (78 men and 154 women) aged above 50 years who underwent both LDCT and DXA within 30 days were evaluated. LDCT-measured bone attenuation in Hounsfield units (HU) of four vertebrae (T4, T7, T10, and L1) was evaluated using volumetric methods for correlation with DXA-measured bone mineral density (BMD) and for the diagnosis of compression fractures, osteoporosis, and low BMD (osteoporosis or osteopenia) in men and women, with DXA measurements as the reference standard. RESULTS The average attenuation of the four vertebrae showed strong correlation with DXA-measured BMD of the lumbar spine (r = 0.726, p < 0.05). In receiver-operating characteristic (ROC) analyses, the area under the curve (AUC) across LDCT-measured thresholds of the average attenuation to distinguish compression fractures was 0.827, and a threshold of 129.5 HU yielded 90.9 % sensitivity and 64.4 % specificity. Similarly, average attenuation showed high AUCs and good diagnostic performance for detecting osteoporosis and low BMD in both men and women. Among 44 subjects with compression fractures, the average bone attenuation showed strong negative correlation with both the worst fracture grade (r = -0.525, p < 0.05) and cumulative fracture grade score (r = -0.633, p < 0.05). CONCLUSION LDCT-measured bone attenuation by volumetric methods showed good correlation with BMD measured by DXA and good diagnostic performance for identifying bone fragility.
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Affiliation(s)
- Y W Kim
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, College of Medicine, Seoul National University, 101 Daehak-Ro, Jongno-Gu, Seoul, 110-744, Republic of Korea
| | - J H Kim
- Department of Internal Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea
| | - S H Yoon
- Department of Radiology, Institute of Radiation Medicine, Seoul National University Medical Research Center, College of Medicine, Seoul National University, Seoul, Republic of Korea
| | - J H Lee
- Department of Internal Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea
| | - C-H Lee
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, College of Medicine, Seoul National University, 101 Daehak-Ro, Jongno-Gu, Seoul, 110-744, Republic of Korea
| | - C S Shin
- Department of Internal Medicine, College of Medicine, Seoul National University, Seoul, Republic of Korea
| | - Y S Park
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, College of Medicine, Seoul National University, 101 Daehak-Ro, Jongno-Gu, Seoul, 110-744, Republic of Korea.
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Lee J, Ji SC, Kim B, Yi S, Shin KH, Cho JY, Lim KS, Lee SH, Yoon SH, Chung JY, Yu KS, Park HS, Kim SH, Jang IJ. Exploration of Biomarkers for Amoxicillin/Clavulanate-Induced Liver Injury: Multi-Omics Approaches. Clin Transl Sci 2016; 10:163-171. [PMID: 27785887 PMCID: PMC5421739 DOI: 10.1111/cts.12425] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [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: 07/14/2016] [Accepted: 09/20/2016] [Indexed: 12/27/2022] Open
Abstract
To explore potential biomarkers for amoxicillin/clavulanate‐induced liver injury (AC‐DILI), we conducted a clinical trial in 32 healthy subjects based on multi‐omics approaches. Every subject was administered amoxicillin/clavulanate for 14 days. The liver‐specific microRNA‐122 (miR‐122) level increased prior to and correlated well with the observed alanine aminotransferase (ALT) level increase. This result indicates its potential as a sensitive early marker for AC‐DILI. We also identified urinary metabolites, such as azelaic acid and 7‐methylxanthine, with levels that significantly differed among the groups classified by ALT elevation level on day 8 after drug administration (P < 0.05). Lymphocyte proliferation in response to the drug was also observed. These findings demonstrate sequential changes in the process of AC‐DILI, including metabolic changes, increased miR‐122 level, increased liver enzyme activity, and enhanced lymphocyte proliferation after drug administration. In conclusion, this study provides potential biomarkers for AC‐DILI based on currently known mechanisms using comprehensive multi‐omics approaches.
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Affiliation(s)
- J Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - S C Ji
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - B Kim
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - S Yi
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - K H Shin
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, Korea
| | - J Y Cho
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - K S Lim
- Department of Clinical Pharmacology and Therapeutics, CHA University School of Medicine and CHA Bundang Medical Center, Seongnam, Korea
| | - S H Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - S H Yoon
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - J Y Chung
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Bundang Hospital, Seongnam, Korea
| | - K S Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - H S Park
- Department of Allergy & Clinical Immunology, Ajou University School of Medicine, Suwon, Korea
| | - S H Kim
- Department of Allergy & Clinical Immunology, Ajou University School of Medicine, Suwon, Korea
| | - I J Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
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Yun SJ, Jin W, Yoon SH, Chun YS, Cha JG, Koo HS, Park SY, Park JS, Ryu KN, Lee SH, Shin JS. Diagnostic performance of abdominal CT for diagnosis of pelvic fractures: comparison with pelvic CT. Acta Radiol 2016; 57:1244-50. [PMID: 26787672 DOI: 10.1177/0284185115626473] [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: 09/14/2015] [Accepted: 11/23/2015] [Indexed: 12/31/2022]
Abstract
BACKGROUND In the emergency department, patients with abdominopelvic trauma inadvertently undergo both abdominal computed tomography (CT) (for intra-abdominal and intra-pelvic organs) and pelvic CT (CT with multiplanar reformation in three orthogonal planes of the bony pelvis). However, the systemic use of CT is concerning given the cumulative radiation dose. PURPOSE To evaluate the diagnostic value of abdominal CT in comparison to pelvic CT in patients with suspected pelvic fractures. MATERIAL AND METHODS Seventy-two patients who underwent abdominal CT and pelvic CT within a 2-week period to evaluate pelvic fractures were included. Two reviewers retrospectively analyzed eight anatomical regions of the pelvic bones on both abdominal CT and pelvic CT over a 1-week interval. The interpretation of pelvic CT scans by two senior musculoskeletal radiologists was considered as the reference standard. Diagnostic performance and inter-observer agreement of both CT scans were evaluated. RESULTS For reviewers 1 and 2, abdominal CT showed high accuracy (98% and 98%, respectively) as did pelvic CT. For both abdominal CT and pelvic CT, fracture detection in all anatomical regions of the pelvic bones was not significantly different for the two reviewers (P ≥ 0.25). Inter-observer agreement for all anatomical regions of the pelvic bones was excellent or good (k = 0.785-1.0). CONCLUSION Not only pelvic CT but also abdominal CT is acceptable for detection of pelvic fractures, in spite of its thicker sections and different reconstruction algorithm. Therefore, if abdominal CT has already been performed, additional pelvic CT might no longer be necessary in order to exclude a pelvic fracture.
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Affiliation(s)
- Seong Jong Yun
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Republic of Korea
| | - Wook Jin
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Republic of Korea
| | - So Hee Yoon
- Department of Radiology, National Police Hospital, Seoul, Republic of Korea
| | - Young Soo Chun
- Department of Orthopedic Surgery, Kyung Hee University Hospital at Gangdong, Seoul, Republic of Korea
| | - Jang Gyu Cha
- Department of Radiology, Soonchunhyang University Bucheon Hospital, Bucheon, Republic of Korea
| | - Hye-Soo Koo
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Republic of Korea
| | - So Young Park
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Republic of Korea
| | - Ji Seon Park
- Department of Radiology, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Kyung Nam Ryu
- Department of Radiology, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Sun Hwa Lee
- Department of Emergency Medicine, Sanggye Paik Hospital, Inje University College of Medicine, Seoul, Republic of Korea
| | - Jong Soo Shin
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Kyung Hee University School of Medicine, Seoul, Republic of Korea
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Choi HM, Jung GM, Lee WK, Lee HS, Kim BS, Seong CS, Yoon SH, Cho YK. [A case of cryptococcal meningitis mimicking hepatic encephalopathy in a patient with liver cirrhosis caused by chronic hepatitis C]. Korean J Gastroenterol 2016; 64:294-7. [PMID: 25420740 DOI: 10.4166/kjg.2014.64.5.294] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Cryptococcus neoformans, an encapsulated fungus, is an important opportunistic pathogen that can cause meningitis in im-munocompromised patients. Since patients with cryptococcemia have high mortality, it is essential to make an early diagnosis and promptly initiate antifungal therapy. However, it is often very difficult to differentiate between cryptococcal meningitis and hepatic encephalopathy in patients with liver cirrhosis, and there is delay in making the diagnosis. Therefore, these patients have a particularly grave prognosis and consequently many patients die before culture results become available. In one study, starting antifungal therapy within 48 hours of the blood culture was associated with improved survival, but patients with liver cirrhosis were significantly less likely to receive antifungal therapy within 48 hours compared to those without liver cirrhosis. Recently, the authors experience a case of a 68-year-old woman with liver cirrhosis who presented with fever and a drowsy mental status. She had a previous history of having been admitted for infection-associated hepatic encephlopathy. Cryptococcal meningitis and cryptococcemia were diagnosed by spinal puncture and culture of cerebrospinal fluid. In spite of adequate treatment, the patient developed multi-system organ failure and eventually expired. Herein, we report a case of cryptococcal meningitis mimicking hepatic encephalopathy in a patient with liver cirrhosis.
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Affiliation(s)
- Hye Mi Choi
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
| | - Gum Mo Jung
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
| | - Woong Ki Lee
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
| | - Hyeuk Soo Lee
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
| | - Byung Sun Kim
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
| | - Choong Sil Seong
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
| | - So Hee Yoon
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
| | - Yong Keun Cho
- Department of Internal Medicine, Presbyterian Medical Center, Seonam University College of Medicine, Jeonju, Korea
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Oh J, Chung H, Park SI, Yi SJ, Jang K, Kim AH, Yoon J, Cho JY, Yoon SH, Jang IJ, Yu KS, Chung JY. Inhibition of the multidrug and toxin extrusion (MATE) transporter by pyrimethamine increases the plasma concentration of metformin but does not increase antihyperglycaemic activity in humans. Diabetes Obes Metab 2016; 18:104-8. [PMID: 26381793 DOI: 10.1111/dom.12577] [Citation(s) in RCA: 33] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2015] [Revised: 09/10/2015] [Accepted: 09/14/2015] [Indexed: 12/29/2022]
Abstract
We hypothesized that the pharmacodynamic (PD) characteristics of metformin would change with inhibition of the multidrug and toxin extrusion (MATE) transporter, which mediates renal elimination of metformin. Twenty healthy male subjects received two doses (750/500 mg) of metformin, with and without 50 mg of pyrimethamine (a potent MATE inhibitor), with 1 week of washout in between each dose. The PD characteristics of metformin were assessed using oral glucose tolerance tests (OGTTs) before and after the metformin dose. Metformin concentrations in plasma and urine were determined using liquid chromatography-electrospray ionization-tandem mass spectrometry. When metformin was co-administered with pyrimethamine, its area under the concentration-time curve from 0 to 12 h was 2.58-fold greater (p < 0.05), whereas the antihyperglycaemic effects of metformin were decreased. The mean differences (90% confidence interval) in mean and maximum serum glucose concentrations and in 2-h-post-OGTT serum glucose concentration were -0.6 (-1, -0.2), -0.9 (-1.6, -0.3) and -0.5 (-1.1, 0.1) mmol/l, respectively. These findings indicate that the response to metformin is not only related to the plasma exposure of metformin but is also related to other factors, such as inhibition of uptake transporters and the gastrointestinal-based pharmacology of metformin.
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Affiliation(s)
- J Oh
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - H Chung
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - S-I Park
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - S J Yi
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - K Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - A H Kim
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - J Yoon
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - J-Y Cho
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - S H Yoon
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - I-J Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - K-S Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Republic of Korea
| | - J-Y Chung
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Bundang Hospital, Seongnam, Republic of Korea
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Yun SJ, Jin W, Park YK, Kim GY, Yoon SH, Park SY, Lee JE, Park JS, Ryu KN. Increased signal intensity at the proximal patellar tendon: correlation between MR imaging and histology in eight cadavers and clinical MR imaging studies. Eur Radiol 2015; 25:2976-83. [DOI: 10.1007/s00330-015-3722-3] [Citation(s) in RCA: 5] [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] [Received: 09/29/2014] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 01/17/2023]
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Lee JE, Park JS, Ryu KN, Rhee YG, Yoon SH, Park SY, Jin W. Repaired supraspinatus tendons in clinically improving patients: early postoperative findings and interval changes on MRI. Korean J Radiol 2015; 16:363-71. [PMID: 25741199 PMCID: PMC4347273 DOI: 10.3348/kjr.2015.16.2.363] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 01/07/2015] [Indexed: 01/08/2023] Open
Abstract
Objective To demonstrate and further determine the incidences of repaired supraspinatus tendons on early postoperative magnetic resonance imaging (MRI) findings in clinically improving patients and to evaluate interval changes on follow-up MRIs. Materials and Methods Fifty patients, who showed symptomatic and functional improvements after supraspinatus tendon repair surgery and who underwent postoperative MRI twice with a time interval, were included. The first and the second postoperative MRIs were obtained a mean of 4.4 and 11.5 months after surgery, respectively. The signal intensity (SI) patterns of the repaired tendon on T2-weighted images from the first MRI were classified into three types of heterogeneous high SI with fluid-like bright high foci (type I), heterogeneous high SI without fluid-like bright high foci (type II), and heterogeneous or homogeneous low SI (type III). Interval changes in the SI pattern, tendon thickness, and rotator cuff interval thickness between the two postoperative MRIs were evaluated. Results The SI patterns on the first MRI were type I or II in 45 tendons (90%) and type III in five (10%). SI decreased significantly on the second MRI (p < 0.050). The mean thickness of repaired tendons and rotator cuff intervals also decreased significantly (p < 0.050). Conclusion Repaired supraspinatus tendons exhibited high SI in 90% of clinically improving patients on MRI performed during the early postsurgical period. The increased SI and thickness of the repaired tendon decreased on the later MRI, suggesting a gradual healing process rather than a retear.
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Affiliation(s)
- Jung Eun Lee
- Department of Radiology, Kyung Hee University Hospital, Seoul 130-702, Korea
| | - Ji Seon Park
- Department of Radiology, Kyung Hee University Hospital, Seoul 130-702, Korea
| | - Kyung Nam Ryu
- Department of Radiology, Kyung Hee University Hospital, Seoul 130-702, Korea
| | - Yong Girl Rhee
- Department of Orthopaedic Surgery, Kyung Hee University Hospital, Seoul 130-702, Korea
| | - So Hee Yoon
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Seoul 134-727, Korea
| | - So Young Park
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Seoul 134-727, Korea
| | - Wook Jin
- Department of Radiology, Kyung Hee University Hospital at Gangdong, Seoul 134-727, Korea
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Lee JE, Ryu KN, Park JS, Cho YJ, Yoon SH, Park SY, Jin W, Lee KR. Osteochondral lesion of the bilateral femoral heads in a young athletic patient. Korean J Radiol 2014; 15:792-6. [PMID: 25469091 PMCID: PMC4248635 DOI: 10.3348/kjr.2014.15.6.792] [Citation(s) in RCA: 5] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Accepted: 07/20/2014] [Indexed: 11/15/2022] Open
Abstract
Osteochondral lesions of the femoral head are uncommon and few studies have reported their imaging findings. Since joints are at risk of early degeneration after osteochondral damage, timely recognition is important. Osteochondral lesions of femoral head may often be necessary to differentiate from avascular necrosis. Here, we report a case of osteochondral lesions on bilateral femoral heads. This lesion manifested as subchondral cysts in initial radiographs, which led to further evaluation by computed tomography arthrography and magnetic resonance imaging, which revealed overlying cartilage defects.
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Affiliation(s)
- Jung Eun Lee
- Department of Radiology, Kyung Hee University Hospital, College of Medicine, Kyung Hee University, Seoul 130-872, Korea
| | - Kyung Nam Ryu
- Department of Radiology, Kyung Hee University Hospital, College of Medicine, Kyung Hee University, Seoul 130-872, Korea
| | - Ji Seon Park
- Department of Radiology, Kyung Hee University Hospital, College of Medicine, Kyung Hee University, Seoul 130-872, Korea
| | - Yoon Je Cho
- Department of Orthopedic Surgery, Kyung Hee University Hospital, College of Medicine, Kyung Hee University, Seoul 130-872, Korea
| | - So Hee Yoon
- Department of Radiology, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul 134-727, Korea
| | - So Young Park
- Department of Radiology, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul 134-727, Korea
| | - Wook Jin
- Department of Radiology, Kyung Hee University Hospital at Gangdong, College of Medicine, Kyung Hee University, Seoul 134-727, Korea
| | - Kyung Ryeol Lee
- Department of Radiology, Jeju National University Hospital, Jeju 690-767, Korea
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Jeon ES, Jang SA, Yoon SH, Lim BK. P130A novel angiotensin Type I receptor antagonist, Fimasartan, prevents doxorubicin-induced Cardiotoxicity in rats without altering anticancer effect. Cardiovasc Res 2014. [DOI: 10.1093/cvr/cvu082.70] [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
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Oh J, Shin D, Lim KS, Lee S, Jung KH, Chu K, Hong KS, Shin KH, Cho JY, Yoon SH, Ji SC, Yu KS, Lee H, Jang IJ. Aspirin decreases systemic exposure to clopidogrel through modulation of P-glycoprotein but does not alter its antithrombotic activity. Clin Pharmacol Ther 2014; 95:608-16. [PMID: 24566733 DOI: 10.1038/clpt.2014.49] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2014] [Accepted: 02/18/2014] [Indexed: 11/09/2022]
Abstract
Decreased oral clopidogrel absorption caused by induction of intestinal permeability glycoprotein (P-gp) expression after aspirin administration was observed in rats. This study evaluated the effect of aspirin coadministration on the pharmacokinetics/pharmacodynamics of clopidogrel in humans. A single 75-mg dose of clopidogrel was orally administered before and after 2 and 4 weeks of once-daily 100-mg aspirin administration in 18 healthy volunteers who were recruited based on CYP2C19 and PON1 genotypes. Plasma concentrations of clopidogrel and its active metabolite, H4, and relative platelet inhibition (RPI) were determined. The P-gp microRNA miR-27a increased by up to 7.67-fold (P = 0.004) and the clopidogrel area under the concentration-time curve (AUC) decreased by 14% (P > 0.05), but the AUC of H4 remained unchanged and RPI increased by up to 15% (P = 0.002) after aspirin administration. These findings indicate low-dose aspirin coadministration may decrease clopidogrel bioavailability but does not decrease its efficacy.
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Affiliation(s)
- J Oh
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - D Shin
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - K S Lim
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - S Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - K-H Jung
- Department of Neurology, Seoul National University Hospital, Seoul, Korea
| | - K Chu
- Department of Neurology, Seoul National University Hospital, Seoul, Korea
| | - K S Hong
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - K-H Shin
- College of Pharmacy, Research Institute of Pharmaceutical Science, Kyungpook National University, Daegu, Korea
| | - J-Y Cho
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - S H Yoon
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - S C Ji
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - K-S Yu
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - H Lee
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
| | - I-J Jang
- Department of Clinical Pharmacology and Therapeutics, Seoul National University College of Medicine and Hospital, Seoul, Korea
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Yang SW, Kim WY, Cho SH, Yoon SH, Lim JY, Leet SJ. Multifocal microinvasive squamous cell carcinoma with extensive spread of squamous cell carcinoma in situ (CIS) into the uterine corpus, vagina, and left salpinx diagnosed five years after conization of cervical CIS. EUR J GYNAECOL ONCOL 2014; 35:600-603. [PMID: 25423715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
BACKGROUND Multifocal microinvasive squamous cell carcinoma (SCC) with extensive spread of squamous cell carcinoma in situ (CIS) into the uterine corpus, salpinx, and vagina is extremely unusual. CASE The authors present a case of 69-year-old woman with hydrometra who was found to have multifocal microinvasive SCC in the endometrium. The CIS had spread superficially throughout the entire endometrium up to the fundus, completely replacing the epithelium. The uterine cervix, vaginal surface and left salpingeal mucosa were involved. She had previously undergone conization due to cervical CIS five years prior. The pathologic reports showed clear resection margins at that time. CONCLUSION The present case suggests that CIS in the endometrium spread back to the cervix and vagina, although the definite origin of the first CIS was not determined.
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Kim TN, Kim JM, Won JC, Park MS, Lee SK, Yoon SH, Kim HR, Ko KS, Rhee BD. A decision tree-based approach for identifying urban-rural differences in metabolic syndrome risk factors in the adult Korean population. J Endocrinol Invest 2012; 35:847-52. [PMID: 22293132 DOI: 10.3275/8235] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
AIM The purpose of this study was to explore the difference in the pattern of metabolic syndrome (MetS) in urban and rural populations in Korea using data mining techniques. SUBJECTS AND METHODS In total, 1013 adults >30 yr of age from urban (184 males and 313 females) and rural districts (211 males and 305 females) were recruited from Gyeongsangnam-do, Korea. Modified National Cholesterol Education Program Adult Treatment Panel III criteria were used to identify individuals with MetS. We applied a decision tree analysis to elucidate the differences in the clustering of MetS components between the urban and rural populations. RESULTS The prevalence of MetS was 33.2% and 35.2% in urban and rural districts, respectively (p=0.598). The decision-tree approach revealed that the combination of high serum triglycerides (TG) + high systolic blood pressure (SBP), high TG + low HDL cholesterol, and high waist circumference (WC) + high SBP + high fasting plasma glucose (FPG) were strong predictors of MetS in the urban population, whereas the combination of TG + SBP + WC and SBP + WC + FPG showed high positive predictive value for the presence of MetS in the rural population. CONCLUSIONS Although no significant difference was found for the prevalence of MetS between the two populations, the differences in the clustering pattern of MetS components in urban and rural districts in Korea were identified by decision tree analysis. Our findings may serve as a basis to design necessary population-based intervention programs for prevention and progression of MetS and its complications in Korea.
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Affiliation(s)
- T N Kim
- Department of Internal Medicine, Cardiovascular and Metabolic Disease Center, Haeundae Paik Hospital, Inje University College of Medicine, Busan, Republic of Korea
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Kim JJ, Choi YM, Hwang SS, Yoon SH, Lee GH, Chae SJ, Hwang KR, Moon SY. Association of the interferon-γ gene (CA)n repeat polymorphism with endometriosis. BJOG 2011; 118:1061-6. [PMID: 21477169 DOI: 10.1111/j.1471-0528.2011.02963.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVE To investigate whether the interferon-γ (IFN-γ) gene (CA)(n) repeat polymorphism is associated with susceptibility to endometriosis. DESIGN Case-control study. SETTING University Department of Obstetrics and Gynaecology. POPULATION Women with (n = 622) and without (n = 442) endometriosis. METHODS Genotyping was performed by fluorescent polymerase chain reaction (PCR) and gene-scan analysis. MAIN OUTCOME MEASURES Genotype distribution and allele frequency of the dinucleotide (CA)(n) repeat polymorphism in the IFN-γ gene. RESULTS Seven alleles (12-18 repeats) of the IFN-γ gene (CA)(n) repeat polymorphism were found. In both patients with endometriosis and controls the most common allele was composed of 13 repeats, followed by an allele of 15 repeats, and then by an allele of 12 repeats. Patients with endometriosis had a significantly higher incidence of genotypes with alleles composed of fewer repeats (12-13 repeats), compared with the controls (92.0 versus 84.4%, respectively, P < 001). CONCLUSIONS Our results suggest that the (CA)(n) repeat polymorphism in the IFN-γ gene may be associated with a risk of endometriosis in the South Korean population.
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Affiliation(s)
- J J Kim
- Department of Obstetrics and Gynaecology, Seoul National University College of Medicine, Seoul, South Korea
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Yoon SH, Moon JH, Kim MS. Changes in dissociation efficiency and kinetics of peptide ions induced by basic residues and their mechanistic implication. J Am Soc Mass Spectrom 2011; 22:214-220. [PMID: 21472581 DOI: 10.1007/s13361-010-0043-2] [Citation(s) in RCA: 4] [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] [Received: 09/30/2010] [Revised: 11/10/2010] [Accepted: 11/15/2010] [Indexed: 05/30/2023]
Abstract
With matrix-assisted laser desorption ionization (MALDI) time-of-flight (TOF) mass spectrometry, total abundance of product ions formed by dissociation inside (in-source decay, ISD) and outside (post-source decay, PSD) the source was measured for peptide ions [Y(5)X + H](+), [XY(5) + H](+), [Y 2)XY(3) + H](+), and [XY(4)X + H](+) (X = tyrosine (Y), histidine (H), lysine (K), and arginine (R) with H for the ionizing proton). α-Cyano-4-hydroxycinammic acid was used as matrix. Product abundance became smaller in the presence of basic residues (H, K, and R), in the order Y > H ≈ K > R. In particular, product abundances in ISD of peptide ions with R were smaller than those with H or K by an order of magnitude, which, in turn, were smaller than that for [Y(6) + H](+) by an order of magnitude. Product abundance was affected by the most basic residue when more than one basic residue was present. A kinetic explanation for the data was attempted under the assumption of quasi-thermal equilibrium for peptide ions in MALDI plume which undergoes expansion cooling. Dramatic disparity in product abundance was found to arise from small difference in critical energy and entropy. Results indicate similar transition structures regardless of basic residues present, where the ionizing proton keeps interacting with a basic site. Further implication of the results on the dissociation mechanism along b-y channels is discussed.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul, Korea
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Yoon SH, Moon JH, Kim MS. A comparative study of in- and post-source decays of peptide and preformed ions in matrix-assisted laser desorption ionization time-of-flight mass spectrometry: effective temperature and matrix effect. J Am Soc Mass Spectrom 2010; 21:1876-1883. [PMID: 20696595 DOI: 10.1016/j.jasms.2010.07.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2010] [Revised: 07/01/2010] [Accepted: 07/05/2010] [Indexed: 05/29/2023]
Abstract
In-source decay (ISD) and post-source decay (PSD) of a peptide ion ([Y(6) + H](+)) and a preformed ion (benzyltriphenylphosphonium, BTPP) generated by matrix-assisted laser desorption ionization (MALDI) were investigated with time-of-flight mass spectrometry. α-Cyano-4-hydroxycinammic acid (CHCA) and 2,5-dihydroxybenzoic acid (DHB) were used as matrices. For both ions, ISD yield was unaffected by delay time, indicating rapid termination of ISD. This was taken as evidence for rapid expansion cooling of hot "early" plume formed in MALDI. CHCA was hotter than DHB for [Y(6) + H](+) while the matrix effect was insignificant for BTPP. The "early" plume temperature estimated utilizing previous kinetic results was 800-900 K, versus 400-500 K for "late" plume. The results support our previous finding that the temperature of peptide ions interrogated by tandem mass spectrometry was lower than most rough estimates of MALDI temperature.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul, Korea
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Yoon SH, Moon JH, Kim MS. Dissociation mechanisms and implication for the presence of multiple conformations for peptide ions with arginine at the C-terminus: time-resolved photodissociation study. J Mass Spectrom 2010; 45:806-814. [PMID: 20564416 DOI: 10.1002/jms.1773] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Time-resolved photodissociation (PD) patterns of singly protonated peptides with arginine at the C-terminus (C-arg peptide ions) have been used to classify the dissociation channels into two categories, i.e. high-energy channels generating v, w and x and low-energy ones generating b, y and z. x + 1 formed by C(alpha)-CO cleavage seems to be the intermediate ion in high-energy channels just as a + 1 is for N-arg peptide ions. Difference in time-resolved pattern indicates that the two sets of channels, high- and low-energy ones, are not in direct competition. Noncompetitive dissociation is also indicated by the observation of anomalous effect of matrix used in matrix-assisted laser desorption ionization, a cooler matrix generating more high-energy product ions both in spontaneous dissociation and in PD. Results from detailed investigation suggest that the two sets of channels start from two (or more) different conformations.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul 151-742, Korea
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Moon JH, Yoon SH, Bae YJ, Kim MS. Dissociation kinetics of singly protonated leucine enkephalin investigated by time-resolved photodissociation tandem mass spectrometry. J Am Soc Mass Spectrom 2010; 21:1151-1158. [PMID: 20409731 DOI: 10.1016/j.jasms.2010.03.025] [Citation(s) in RCA: 4] [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] [Received: 02/12/2010] [Revised: 03/12/2010] [Accepted: 03/17/2010] [Indexed: 05/29/2023]
Abstract
The yields of post-source decay (PSD) and time-resolved photodissociation (PD) at 193 and 266 nm were measured for singly protonated leucine enkephalin ([YGGFL + H](+)), a benchmark in the study of peptide ion dissociation, by using tandem time-of-flight mass spectrometry. The peptide ion was generated by matrix-assisted laser desorption ionization (MALDI) using 2,5-dihydroxybenzoic acid as the matrix. The critical energy (E(0)) and entropy (DeltaS(++) at 1000 K) for the dissociation were determined by Rice-Ramsperger-Kassel-Marcus fit of the experimental data. MALDI was done for a mixture of YGGFL and Y(6) and the plume temperature determined by the kinetic analysis of [Y(6) + H](+) data were used to improve the precision of E(0) and DeltaS(++) for [YGGFL + H](+). E(0) and DeltaS(++) thus determined (E(0) = 0.67 +/- 0.08 eV, DeltaS(++) = -24.4 +/- 3.2 eu with 1 eu = 4.184 J K(-1)mol(-1)) were significantly different from those determined by blackbody infrared radiative dissociation (BIRD) (E(0) = 1.10 eV, DeltaS(++) = -14.9 eu), and by surface-induced dissociation (SID) (E(0) = 1.13 eV, DeltaS(double dagger) = -10.3 eu). Analysis of the present experimental data with the SID kinetics (and BIRD kinetics also) led to an unrealistic situation where not only PSD and PD but also MALDI-TOF signals could not be detected. As an explanation for the discrepancy, it was suggested that transition-state switching occurs from an energy bottleneck (SID/BIRD) to an entropy bottleneck (PSD/PD) as the internal energy increases.
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Affiliation(s)
- Jeong Hee Moon
- Medical Proteomics Research Center, KRIBB, Daejeon, Korea
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Yoon SH, Moon JH, Chung YJ, Kim MS. Influence of basic residues on dissociation kinetics and dynamics of singly protonated peptides: time-resolved photodissociation study. J Mass Spectrom 2009; 44:1532-1537. [PMID: 19753580 DOI: 10.1002/jms.1670] [Citation(s) in RCA: 4] [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: 05/28/2023]
Abstract
Product ion yields in postsource decay and time-resolved photodissociation at 193 and 266 nm were measured for some peptide ions with lysine ([KF6 + H]+, [F6K + H]+, and [F3KF3 + H]+) formed by matrix-assisted laser desorption ionization. The critical energy (E0) and entropy (DeltaS(double dagger)) were determined by RRKM fitting of the data. The results were similar to those found previously for peptide ions with histidine. To summarize, the presence of a basic residue, histidine or lysine, inside a peptide ion retarded its dissociation by lowering DeltaS(double dagger). On the basis of highly negative DeltaS(double dagger), presence of intramolecular interaction involving a basic group in the transition structure was proposed.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul 151-742, Republic of Korea
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Yoon SH, Moon JH, Kim MS. Time-resolved photodissociation study of singly protonated peptides with a histidine residue generated by matrix-assisted laser desorption ionization: dissociation rate constant and internal temperature. J Am Soc Mass Spectrom 2009; 20:1522-1529. [PMID: 19467884 DOI: 10.1016/j.jasms.2009.04.008] [Citation(s) in RCA: 4] [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] [Received: 02/14/2009] [Revised: 04/11/2009] [Accepted: 04/14/2009] [Indexed: 05/27/2023]
Abstract
Product ion yields in post-source decay and time-resolved photodissociation at 193 and 266 nm were measured for some peptide ions with a histidine residue ([HF(6) + H](+), [F(6)H + H](+), and [F(3)HF(3) + H](+)) formed by matrix-assisted laser desorption ionization (MALDI). Compared with similar data for peptide ions without any basic residue reported previously, significant reduction in dissociation efficiency was observed. Internal temperatures (T) of the peptide ions and their dissociation kinetic parameters-the critical energy (E(0)) and entropy (DeltaS(double dagger))-were determined by the method reported previously. Slight decreases in E(0), DeltaS(double dagger), and T were responsible for the histidine effect-reduction in dissociation rate constant. Regardless of the presence of the residue, DeltaS(double dagger) was far more negative than previous quantum chemical results. Based on this, we propose the existence of transition structures in which the nitrogen atoms in the histidine residue or at the N-terminus coordinate to the reaction centers. Reduction in T in the presence of a histidine residue could not be explained based on popular models for ion formation in MALDI, such as the gas-phase proton transfer model.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul, Korea
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Moon JH, Yoon SH, Kim MS. Temperature of Peptide Ions Generated by Matrix-Assisted Laser Desorption Ionization and Their Dissociation Kinetic Parameters. J Phys Chem B 2009; 113:2071-6. [DOI: 10.1021/jp810077e] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jeong Hee Moon
- Department of Chemistry, Seoul National University, Seoul 151-742, Korea, and Systemic Proteomics Research Center, KRIBB, Daejeon 305-806, Korea
| | - So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul 151-742, Korea, and Systemic Proteomics Research Center, KRIBB, Daejeon 305-806, Korea
| | - Myung Soo Kim
- Department of Chemistry, Seoul National University, Seoul 151-742, Korea, and Systemic Proteomics Research Center, KRIBB, Daejeon 305-806, Korea
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Yoon SH, Lee JM, Cho HI, Kim EK, Kim HS, Park MY, Kim TG. Adoptive immunotherapy using human peripheral blood lymphocytes transferred with RNA encoding Her-2/neu-specific chimeric immune receptor in ovarian cancer xenograft model. Cancer Gene Ther 2008; 16:489-97. [PMID: 19096447 DOI: 10.1038/cgt.2008.98] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The current gene transfer technology for single chain (scFv)-based chimeric immune receptor (CIR) has relied on retrovirus and lentivirus vectors which require a long time to obtain sufficient number of transduced cells and stably incorporate into genome. To ameliorate these limitations, we applied RNA electroporation to human peripheral blood lymphocytes (PBLs) activated with anti-CD3 antibody and interleukin-2 (IL-2) for 3 days and assessed that PBL transiently expressing anti-Her-2/neu CIR (CIR-PBL) containing signaling portion of CD28 and CD3zeta could elicit strong cytotoxicity in vitro and antitumor responses in vivo. The CIR-PBL expressed high level of CIR in CD4+, CD8+ and CD56+ cells. Her-2/neu-specific stimulation induced secretion of type-I cytokines including interferon-gamma (IFN-gamma), IL-8 and granulocyte-macrophage colony-stimulating factor, and IFN-gamma secretion was mainly mediated by CD8+ T cells. CIR-PBL specifically killed SKOV3 cell line expressing Her-2/neu. Adoptive transfer of CIR-PBL in SKOV3 xenograft model led to significant inhibition of tumor growth compared with transfer of mock-transduced PBL and showed higher inhibition than those with Herceptin, humanized monoclonal antibody specific for Her-2/neu. These results provided evidence that electroporation of CIR RNA to human PBLs could be used for rapid generation and high number of therapeutic antigen-specific T cells for adoptive immunotherapy.
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Affiliation(s)
- S H Yoon
- Department of Microbiology and Immunology, College of Medicine, Catholic University of Korea, Seoul, Korea
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Oh YS, Lee JH, Yoon SH, Oh CH, Choi DS, Choe E, Jung MY. Characterization and quantification of anthocyanins in grape juices obtained from the grapes cultivated in Korea by HPLC/DAD, HPLC/MS, and HPLC/MS/MS. J Food Sci 2008; 73:C378-89. [PMID: 18576983 DOI: 10.1111/j.1750-3841.2008.00756.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The characterization and quantification of anthocyanins in grape cultivars of Oll-Meoru (Vitis coignetiaexVitis labrusca), Neut-Meoru (Vitis coignetiaexVitis labrusca), Muscal Bailey A. (Vitis labruscana), and Campbell Early (Vitis labruscaxV. vinifera) cultivated in Korea were carried out by partial purification through XAD-7 column chromatography followed by C-18 HPLC/diode array detector (DAD), HPLC/MS, and HPLC/MS/MS analyses. The column oven temperature during the reverse phase C-18 HPLC greatly affected the separation of individual anthocyanins. The result showed that the optimum column oven temperature was 35 degrees C. Sixteen different anthocyanins (11 nonacylated and 5 acylated anthocyanins) were identified in the grape juices. Oll-Meoru, Neut-Meoru, and Muscat Bailey A (MBA) grape juices contained only nonacylated anthocyanins. Oll-Meoru and Neut-Meoru grape juices had same anthocyanins, but their proportions were considerably different. Peonidin 3,5-diglucoside and malvidin 3,5-diglucoside were the major anthocyanins in Oll-Meoru grape juice. Delphinidin 3-glucoside was, however, the major anthocyanin in Neut-Meoru grape juice. Peonidin 3-glucoside and malvidin 3-glucoside were the most abundant anthocyanins in Muscal Bailey A grape juice. Campbell Early grape juice contained both nonacylated and acylated anthocyanins. Cyanidin 3-(p-coumaroyl)glucoside-5-glucoside and peonidin 3-(p-coumaroyl)glucoside-5-glucoside were the most abundant anthocyanins in Campbell Early grape juice. Total anthocyanin contents were greatly different in different grape jucies, with the highest in Neut-Meoru juice (1043.5 microg/mL), followed by Oll-Meoru (997.7 microg/mL), MBA (390.2 microg/mL), and Campbell Early (183.9 microg/mL) juices. The total anthocyanin content in Neut-Meoru grape juice was 5.67 times higher than that in Campbell Early grape juice. This represents the 1st report on the systematic characterization and quantification of anthocyanins in the juices of these grapes cultivated in Korea.
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Affiliation(s)
- Y S Oh
- Department of Bioscience and Biotechnology in Graduate School, Woosuk University, Samrea-Up, Wanju-Kun, Jeonbuk Province 565-701, Republic of Korea
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Son HJ, Song SY, Lee WY, Yang SS, Park SH, Yang MH, Yoon SH, Chun HK. Characteristics of early colorectal carcinoma with lymph node metastatic disease. Hepatogastroenterology 2008; 55:1293-1297. [PMID: 18795675] [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] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
BACKGROUND/AIMS Endoscopic resection may safely and effectively remove early colorectal cancers. However, additional surgical treatment is needed in cases with metastatic lymph nodes for curative treatment. The purpose of this study was to investigate the correlation between lymph node metastasis and various pathological parameters in early colorectal cancers. METHODOLOGY The clinicopathological records of 3,557 colorectal adenocarcinoma patients who underwent surgical resection at the Samsung Medical Center from August 1995 to June 2005 were reviewed. One hundred forty seven tissue samples with early colorectal cancer were used in this study. Various parameters were studied including gender, location, macroscopic appearance, differentiation, lymphatic tumor emboli, and the depth of tumor invasion. RESULTS Twenty five patients (17.0%) had lymph node metastasis. Male gender, left colon, macroscopically depressed lesions, moderately or poorly differentiated carcinoma, depth of tumor invasion (Sm2 or Sm3), and presence of lymphatic tumor emboli were the risk factors for lymph node metastasis. CONCLUSIONS Early colorectal cancers with male gender, location in the left colon, macroscopically depressed lesion, moderate or poor differentiation, depth in Sm2 or Sm3, and the presence of lymphatic tumor emboli have higher risk of lymph node metastasis than those without. The early colorectal cancers with these risk factors should have surgical resection.
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Affiliation(s)
- H J Son
- Department of Medicine, Samsung Medical Center, 50 Irwon-dong, Gangnam-gu, Seoul 135-710, Korea
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Yoon SH, Chung YJ, Kim MS. Time-resolved photodissociation of singly protonated peptides with an arginine at the N-terminus: a statistical interpretation. J Am Soc Mass Spectrom 2008; 19:645-655. [PMID: 18356076 DOI: 10.1016/j.jasms.2008.02.003] [Citation(s) in RCA: 9] [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] [Subscribe] [Scholar Register] [Received: 01/02/2008] [Revised: 02/14/2008] [Accepted: 02/16/2008] [Indexed: 05/26/2023]
Abstract
Time-evolution of product ion signals in ultraviolet photodissociation (UV-PD) of singly protonated peptides with an arginine at the N-terminus was investigated by using a tandem time-of-flight mass spectrometer equipped with a cell floated at high voltage. Observation of different time-evolution patterns for different product ion types--an apparently nonstatistical behavior--could be explained within the statistical framework by invoking consecutive formation of some product ions and broad internal energy distributions for precursor ions. a(n) + 1 and b(n) ions were taken as the primary product ions from this type of peptide ions. Spectral characteristics in post-source decay, UV-PD, and collisionally activated dissociation at low and high kinetic energies could be explained via rough statistical calculation of rate constants. Specifically, the striking characteristics in high-energy CAD and UV-PD--dominance of a(n) and d(n) formed via a(n) + 1--were not due to the peculiarity of the excitation processes themselves, but due to quenching of the b(n) channels caused by the presence of arginine.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul, Korea
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Park HJ, Yoon SH, Zheng LT, Lee KH, Kim JW, Chung JH, Lee YA, Hong SJ. Association of the -2510A/G chemokine (C-C motif) ligand 2 polymorphism with knee osteoarthritis in a Korean population. Scand J Rheumatol 2007; 36:299-306. [PMID: 17763208 DOI: 10.1080/03009740701288165] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [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: 12/14/2022]
Abstract
OBJECTIVE To investigate the possible association between polymorphisms [the -2510A/G promoter polymorphism (rs1024611) and the Cys35Cys coding polymorphism (rs4586) in exon 2] of the chemokine (C-C motif) ligand 2 (CCL2) gene and knee osteoarthritis (OA) in a Korean population. METHODS DNA was obtained from 153 Korean primary knee OA patients and 270 healthy controls. CCL2 genomic variants (-2510A/G and Cys35Cys polymorphisms) were detected by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP). In additional, the effect of -2510A/G on CCL2 transcription was examined, using a luciferase reporter gene construct transfected into HMC-1 cells. RESULTS The -2510A/G promoter polymorphism was associated with OA [genotype frequency, p = 0.041; allele frequency, p = 0.017, odds ratio (OR) = 1.45, 95% confidence interval (CI) = 1.07-1.96]. Significant association was observed between the G carrier of the -2510A/G promoter polymorphism and primary knee OA patients (p = 0.021, OR = 2.25, 95% CI = 1.12-4.52). The G carrier of the -2510A/G promoter polymorphism was also associated with both clinically subtyped OA patients (OA patients with functionally poor index and radiographically severe OA patients). However, no significant difference was found in the Cys35Cys polymorphism. Haplotype frequency analysis revealed a significant difference (chi(2) = 8.98, p = 0.030). The CCL2 serum level of subjects with the G carrier (290.0+/-87.5 pg/mL) of the -2510A/G promoter polymorphism was statistically higher than that of subjects with the non-G carrier (161.5+/-48.3 pg/mL). The luciferase activity was significantly greater from interleukin (IL)-1beta-induced cells transfected with constructs containing G at position -2510. CONCLUSIONS The G carrier of the -2510A/G promoter polymorphism was found to be associated with primary knee OA, and could be a susceptibility factor in the development of primary knee OA in the Korean population.
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Affiliation(s)
- H J Park
- Kohwang Medical Research Institute, College of Medicine, Kyung Hee University, Seoul, Korea.
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Yoon SH, Kim MS. Development of a time-resolved method for photodissociation mechanistic study of protonated peptides: use of a voltage-floated cell in a tandem time-of-flight mass spectrometer. J Am Soc Mass Spectrom 2007; 18:1729-39. [PMID: 17702598 DOI: 10.1016/j.jasms.2007.07.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2007] [Revised: 06/26/2007] [Accepted: 07/03/2007] [Indexed: 05/16/2023]
Abstract
Photodissociation at 266 nm of some protonated peptides was investigated using a tandem-TOF spectrometer equipped with a cell near its first time focal point where the laser was irradiated. When a high voltage was applied to the cell, each product ion peak split into several components with different flight times. One of these was due to in-cell direct formation of the product ion and another due to post-cell formation. Those in between were due to consecutive dissociations, the first steps of which occurred inside the cell and the second steps outside the cell. A method based on flight time calculation was developed to analyze these components and to identify the intermediate ion for each consecutive component. The technique allows time-resolved photodissociation mechanistic studies on a 100-ns timescale.
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Affiliation(s)
- So Hee Yoon
- Department of Chemistry, Seoul National University, Seoul, Korea
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48
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Qiao WM, Yoon SH, Mochida I, Yang JH. Waste polyvinylchloride derived pitch as a precursor to develop carbon fibers and activated carbon fibers. Waste Manag 2007; 27:1884-90. [PMID: 17157493 DOI: 10.1016/j.wasman.2006.10.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2005] [Revised: 09/10/2006] [Accepted: 10/04/2006] [Indexed: 05/12/2023]
Abstract
Polyvinylchloride (PVC) was successfully recycled through the solvent extraction from waste pipe with an extraction yield of ca. 86%. The extracted PVC was pyrolyzed by a two-stage process (260 and 410 degrees C) to obtain free-chlorine PVC based pitch through an effective removal of chlorine from PVC during the heat-treatment. As-prepared pitch (softening point: 220 degrees C) was spun, stabilized, carbonized into carbon fibers (CFs), and further activated into activated carbon fibers (ACFs) in a flow of CO2. As-prepared CFs show comparable mechanical properties to commercial CFs, whose maximum tensile strength and modulus are 862 MPa and 62 GPa, respectively. The resultant ACFs exhibit a high surface area of 1200 m2/g, narrow pore size distribution and a low oxygen content of 3%. The study provides an effective insight to recycle PVC from waste PVC and develop a carbon precursor for high performance carbon materials such as CFs and ACFs.
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Affiliation(s)
- W M Qiao
- State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China.
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Choi KM, Yoon SH, Sun M, Oh JY, Moon JH, Kim MS. Characteristics of photodissociation at 193 nm of singly protonated peptides generated by matrix-assisted laser desorption ionization (MALDI). J Am Soc Mass Spectrom 2006; 17:1643-53. [PMID: 16934996 DOI: 10.1016/j.jasms.2006.07.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2006] [Revised: 07/15/2006] [Accepted: 07/19/2006] [Indexed: 05/11/2023]
Abstract
Photodissociation (PD) at 193 nm of various singly protonated peptides was investigated. These include peptides with an arginine residue at the C-terminus, N-terminus, at both termini, inside the chain, and those without an arginine residue. Monoisotopomeric selection was made for the precursor ions. Interference from the post-source decay (PSD) product signals was reduced as much as possible by using the deflection system (reported previously) and subtracting the remaining signals from the laser-on signals. The presence of an arginine residue and its position inside the peptide were found to significantly affect the PD spectra, as reported previously. Presence of a proline, aspartic acid, or glutamic acid residue hardly affected the PD spectral patterns. By comparing the PD spectra obtained at a few different wavelengths, it is concluded that the dissociation of the photoexcited ions occurs in their ground electronic states. Tentative explanations for the observed spectral correlations based on the statistical picture for the reactions are also presented.
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Affiliation(s)
- Kyung Mi Choi
- National Creative Research Initiative Center for Control of Reaction Dynamics and School of Chemistry, Seoul National University, Seoul, Korea
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50
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Park SW, Yoon SH, Cho KG. An endoscopically proven ventriculitis-type, cyst-like intraventricular primary lymphoma of the central nervous system. Acta Neurochir (Wien) 2006; 148:981-4. [PMID: 16791437 DOI: 10.1007/s00701-006-0797-2] [Citation(s) in RCA: 13] [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] [Subscribe] [Scholar Register] [Received: 08/01/2005] [Accepted: 04/18/2006] [Indexed: 10/24/2022]
Abstract
Primary ventriculitis form of primary CNS lymphoma (PCNSL) is very rare and difficult to diagnose from radiological findings. A 55-year-woman presented with a cystic mass in the lateral ventricle without evidence of demonstrable malignant cells in the cerebrospinal fluid (CSF). The endoscopic biopsy showed a ventriculitis-like thin web on the surface of the ventricular wall around the foramen of Monro, resulting in obstruction. Pathological diagnosis was non-Hodgkin's lymphoma, B cell type. This case suggests that PCNSL should be considered as a differential diagnosis for a cystic ventricular lesion even with no malignant cells in the CSF.
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Affiliation(s)
- S W Park
- Department of Neurosurgery, Kangwon National University College of Medicine, Chunchon, Korea
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