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- 저자 : Lee Yangsoon (검색결과 25 건)
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Lee Yangsoon,Bae Hye Gyung,Won Dongju,Yun Woobin,Lee Hyukmin,Choi Jong Rak,Uh Young,Lee Kyungwon 대한진단검사의학회 2023 Annals of Laboratory Medicine Vol.43 No.2
Background: The incidence of early- and late-onset sepsis and meningitis in neonates due to maternal rectovaginal group B Streptococcus (GBS) colonization may differ with serotype distribution and clonal complex (CC). CC17 strains are associated with hypervirulence and poor disease outcomes. GBS serotypes are distinguished based on the polysaccharide capsule, the most important virulence factor. We determined the sequence type distribution of GBS isolates from pregnant women in Korea and validated whole-genome sequencing (WGS)-based prediction of antimicrobial susceptibility and capsular serotypes in GBS isolates. Methods: Seventy-five GBS isolates collected from pregnant Korean women visiting Wonju Severance Christian Hospital, Wonju, Korea between 2017 and 2019 were subjected to WGS using the NovaSeq 6000 system (Illumina, San Diego, CA, USA). Multilocus sequence types, serotypes, antimicrobial resistance genes, and hemolysin operon mutations were determined by WGS, and the latter three were compared with the results of conventional phenotypic methods. Results: The predominant lineage was CC1 (37.3%), followed by CC19 (32.0%), CC12 (17.3%), and CC17 (4.0%). All isolates were cps typeable (100%, (75/75), and 89.3% of cps genotypes (67/75) were concordant with serotypes obtained using latex agglutination. The cps genotypes of the 75 isolates were serotypes III (24.0%), V (22.7%), and VIII (17.3%). All isolates harboring intact ermB and tet were non-susceptible to erythromycin and tetracycline, respectively. Three non-hemolytic strains had 1-bp frameshift insertions in cylE. Conclusions: The low prevalence of CC17 GBS colonization may explain the low frequency of neonatal GBS infections. WGS is a useful tool for simultaneous genotyping and antimicrobial resistance determination.
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Lee, Yangsoon,Yum, Jong Hwa,Kim, Chang-Ki,Yong, Dongeun,Jeon, Eun Hee,Jeong, Seok Hoon,Ahn, Jee Young,Lee, Kyungwon Institute for Clinical Science] 2010 Annals of clinical and laboratory science Vol.40 No.1
<P>This study was performed to determine the mechanisms for acquiring carbapenem resistance in six clinical isolates of Acinetobacter baumannii. All isolates showed similar SmaI-macrorestriction patterns with less than 3 band differences by PFGE. The isolates showed a high level resistance (>32 mg/L) to both imipenem and meropenem by Etest. Phe-Arg-beta-naphthylamide lowered the MICs of carbapenems. Real-time PCR experiments showed that expression levels of the adeB gene in the six A. baumannii isolates were 10- to 40-times higher than those of imipenem-susceptible strains. Direct sequencing of PCR products showed that all isolates carried the bla(OXA-23) gene, which was preceded by ISAba1. The bla(OXA-23) probe hybridized with approximately 500-kb I-CeuI chromosomal fragments, but not with a plasmid. These findings suggest that overexpression of the AdeABC efflux pump as well as chromosome-borne OXA-23 may play a role in acquiring carbapenem resistance in our A. baumannii isolates.</P>
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Lee, Yangsoon,Park, Yongjung,Kim, Myung Sook,Yong, Dongeun,Jeong, Seok Hoon,Lee, Kyungwon,Chong, Yunsop American Society for Microbiology 2010 Antimicrobial Agents and Chemotherapy Vol.54 No.9
<B>ABSTRACT</B><P>We determined the antimicrobial susceptibilities of 255 clinical isolates of anaerobic bacteria collected in 2007 and 2008 at a tertiary-care hospital in South Korea. Piperacillin-tazobactam, cefoxitin, imipenem, and meropenem were highly active β-lactam agents against most of the isolates tested. The rates of resistance of <I>Bacteroides fragilis</I> group organisms and anaerobic Gram-positive cocci to moxifloxacin were 11 to 18% and 0 to 27%, respectively.</P>
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Kim, Sun A,Lee, Yangsoon,Jung, Dawoon E,Park, Kyung Hwa,Park, Jeong Youp,Gang, Jingu,Jeon, Sun Bok,Park, Eui Chul,Kim, Young-Gun,Lee, Bogman,Liu, Qing,Zeng, Wen,Yeramilli, Subramanyam,Lee, Soojin,Koh, Japanese Cancer Association 2009 CANCER SCIENCE Vol.100 No.5
<P>The identification of novel tumor-specific proteins or antigens is of great importance for diagnostic and therapeutic applications in pancreatic cancer. Using oligonucleotide microarrays, we identified a broad spectrum of differentially expressed pancreatic cancer-related genes. Of these, we selected an overexpressed expressed sequence taq and cloned a 721-bp full-length cDNA with an open reading frame of 196 amino acids. This novel gene was localized on the Homo sapiens 16p13.3 chromosomal locus, and its nucleotide sequence matched the Homo sapiens similar to common salivary protein 1 (LOC124220). We named the gene pancreatic adenocarcinoma up-regulated factor. The pancreatic adenocarcinoma up-regulated factor was secreted into the culture medium of pancreatic adenocarcinoma up-regulated factor-overexpressing Chinese hamster ovary cells, had an apparent molecular mass of approximately 25 kDa, and was N-glycosylated. The induction of pancreatic adenocarcinoma up-regulated factor in Chinese hamster ovary cells increased cell proliferation, migration, and invasion ability in vitro. Subcutaneous injection of mice with Chinese hamster ovary/pancreatic adenocarcinoma up-regulated factor cells resulted in 3.8-fold greater tumor sizes compared to Chinese hamster ovary/mock cells. Reverse transcription-polymerase chain reaction and western blotting with antirecombinant human pancreatic adenocarcinoma up-regulated factor antibodies confirmed that pancreatic adenocarcinoma up-regulated factor was highly expressed in six of eight pancreatic cancer cell lines. Immunohistochemical staining of human pancreatic cancer tissues also showed pancreatic adenocarcinoma up-regulated factor overexpression in the cytoplasm of cancer cells. Transfection with pancreatic adenocarcinoma up-regulated factor-specific small-interfering RNA reduced cancer cell migration and invasion in vitro. Treatment with antirecombinant human pancreatic adenocarcinoma up-regulated factor in vitro and in vivo reduced proliferation, migration, invasion, and tumorigenic ability. Collectively, our results suggest that pancreatic adenocarcinoma up-regulated factor is a novel secretory protein involved in pancreatic cancer progression and might be a potential target for the treatment of pancreatic cancer.</P>
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Mecillinam의 임상분리 장내세균 대한 시험관내 항균력
김창기,염종화,이상국,이양순,최준용,김준명,이경원,정윤섭 대한감염학회 2009 감염과 화학요법 Vol.41 No.3
Background : Mecillinam, an amidinopenicillin antibiotic, has been used to treat urinary tract infections and bacterial enteritis in many countries, In this study, we evaluated in vitro activity of mecillinam against Enterobacteriaceae isolates from urine, and Salmonella and Shigella isolates from patients with bacterial gastroenteritis. Materials and Methods : A total of 308 clinical strains were collected and were comprised of Escherichia coli (n=109), Klebsiella pneumonias (n=52), Enterobacter spp. (n=30), Serratia marcescens (n=30) and Proteus spp. (n=29) isolated from a university hospital in Korea in 2007, and of Salmonella spp. (n=28) and Shigella spp. (n=30) isolated from Korean diarrheal patients from 2001 to 2006. Antimicrobial susceptibility was tested by Clinical laboratory Standard Institute (CLSI) agar dilution method. CLSI breakpoint of mecillinam for E. coli urinary tract isolates was applied to all other isolates. Results : In E. coli, rate of susceptibility to ampicillin was 30%, but 99-100% to amikacin and cefotaxime. Most (96%) of E. coli isolates, including extended-spectrum B-lactamase (ESBL) Producers, were susceptible to mecillinam. All ESBL producers, except for one isolate, were inhibited by ≤4 ug/mL of mecillinam. MIC_90 of mecillinam for K. pneumonias and Enterobacter spp. was 8 ug/mL and 1 ug/mL, respectively, and the susceptibility rate was 92% and 97%, respectively. However, MIC_90 of mecillinam for S. marcescens isolates was >128 ug/mL and most of them were resistant to meclllinam. All Salmonella isolates and 27 of 30 Shigella isolates were susceptible to meclllinam. Conclusion : Mecillinam was active vitro against most Enterobacteriaceae, Salmonella, and Shigella isolates except for S. marcescens. Therefore, mecillinam can be a good alternative agent for treating urinary tract infection and bacterial gastroenteritis.
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( Mi-jung Jun ),( Ju Hyun Shim ),( Joo Ho Lee ),( Gi-won Song ),( Yangsoon Park ),( Eunsil Yu ),( Sung-gyu Lee ),( Jihyun An ),( Danbi Lee ),( Kang Mo Kim ),( Young-suk Lim ),( Han Chu Lee ),( Young-h 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: It has been found that methionine adenosyltransferase 1A (MAT1A) gene, encoding isoenzymes MAT I/III, is dysregulated in hepatocellular carcinoma (HCC), and reduced MAT1A expression correlates with worse HCC prognosis. The X protein of hepatitis B virus (HBV) inhibits apoptosis in HCC cells through enhancing the expression of MAT2A gene, encoding MAT II. MA1A/MAT2A switch has been severally demonstrated to be involved in hepatocarcinogenesis. We aimed to investigate prognostic implication of MAT I and MAT II protein expression in HBV-infected patients undergoing hepatic resection for HCC. Methods: In this study, we used a tissue microarray constructed from archival surgical specimens of 166 patients with HBV-related HCC who underwent curative hepatectomy at Asan Medical Center. The tumor tissue microarray was immunohistochemically stained with primary antibodies against MAT I and MAT II. We examined pre- and post-surgical clinical factors related to MAT 1 and MAT II, using logistic regression analysis, and predictive effect of the two proteins on post-surgical recurrence and survival, using Cox proportional hazards model. Results: Of the 166 patients, 74.1% were male with a mean age of 52.8 ± 8.7 years, 94% were Child-Pugh class A disease, and 55.4% had liver cirrhosis. In terms of histological factors, most patients had solitary tumor (93.4%) and tumors of 5cm or less (74.7%). Microvascular invasion and Edmondson grade III/IV tumors were observed in 30.7% and 66.9%, respectively of the patients. During a median follow-up of 39 months (range 5-81 months), 12 deaths and 63 recurrences had been found, where 52 recurrences occurred early within 2 years after resection. MAT I and MAT II were positively expressed in 83.7% and 87.3%, respectively of the 166 tumor tissues. MAT I expression was independently associated with male and tumors of 5 cm or less (adjusted P<0.05 for both). Expression of MAT II had a significant relationship with only serum AFP >200 ng/mL (adjusted P<0.05). Multivariate Cox regression analyses showed that MAT II expression was significantly correlated with shorter times to overall and early recurrences (hazard ratios 9.97 and 8.26, respectively; adjusted P<0.05 for both), as was not positive MAT I (hazard ratio 1.13; P=0.730). Immunopositivity for two proteins did not influence overall survival (P>0.05 for both). MAT I : MAT II activity ratio below 1.0 was observed in 12.7% of the patients, and not significantly associated with post-surgical recurrence and survival outcomes. Conclusions: Immunohistological expression of MAT II in tumor may be helpful in predicting and monitoring tumor recurrence, especially in the early phase after hepatic resection, in patients with HBV-related HCC.
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Association of Microbial Dysbiosis with Gallbladder Diseases Identified by Bile Microbiome Profiling
Choi Seong Ji,Kim Yeseul,Jeon Jehyun,Gwak Ho-Jin,Kim Mimi,Kang Kyojin,Kim Yohan,Jeong Jaemin,Jung Yun Kyung,Lee Kyeong Geun,Choi Ho Soon,Jung Dong-Hwan,Lee Sung-Gyu,Lee Yangsoon,Shin Su-Jin,Jang Kiseo 대한의학회 2021 Journal of Korean medical science Vol.36 No.28
Background: Cholecystitis is an important risk factor for gallbladder cancer, but the bile microbiome and its association with gallbladder disease has not been investigated fully. We aimed to analyze the bile microbiome in normal conditions, chronic cholecystitis, and gallbladder cancer, and to identify candidate bacteria that play an important role in gallbladder carcinogenesis. Methods: We performed metagenome sequencing on bile samples of 10 healthy individuals, 10 patients with chronic cholecystitis, and 5 patients with gallbladder cancer, and compared the clinical, radiological, and pathological characteristics of the participants. Results: No significant bacterial signal was identified in the normal bile. The predominant dysbiotic bacteria in both chronic cholecystitis and gallbladder cancer were those belonging to the Enterobacteriaceae family. Klebsiella increased significantly in the order of normal, chronic cholecystitis, and gallbladder cancer. Patients with chronic cholecystitis and dysbiotic microbiome patterns had larger gallstones and showed marked epithelial atypia, which are considered as precancerous conditions. Conclusion: We investigated the bile microbiome in normal, chronic cholecystitis, and gallbladder cancer. We suggest possible roles of Enterobacteriaceae, including Klebsiella, in gallbladder carcinogenesis. Our findings reveal a possible link between a dysbiotic bile microbiome and the development of chronic calculous cholecystitis and gallbladder cancer.
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Expression of Lysyl Oxidase Predictive of Distant Metastasis of Laryngeal Cancer
Lee, Yoon Se,Park, Yangsoon,Kwon, Minsu,Roh, Jong-Lyel,Choi, Seung-Ho,Nam, Soon Yuhl,Kim, Sang Yoon SAGE Publications 2017 Otolaryngology-head and neck surgery Vol.156 No.3
<P>Conclusion. A high expression level of LOX is associated with lymph node and distant metastasis as well as poor prognosis among patients with laryngeal cancer.</P>
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Sunghee Lee,Minsoo Shin,Seo Hee Kim,Seong Pyo Kim,Hyung-Jin Yoon,Yangsoon Park,Jaemoon Koh,Seak Hee Oh,Jae Sung Ko,Jin Soo Moon,Kyung Mo Kim 대한소아소화기영양학회 2024 Pediatric gastroenterology, hepatology & nutrition Vol.27 No.4
Purpose: Few studies have reported the prevalence of inflammatory bowel disease unclassified (IBDU) among Korean pediatric IBD (PIBD) population. To address this gap, we used two tertiary centers and nationwide population-based healthcare administrative data to estimate the prevalence of Korean pediatric IBDU at the time of diagnosis. Methods: We identified 136 patients aged 2–17 years with newly diagnosed IBD (94 Crohn’s disease [CD] and 42 ulcerative colitis [UC]) from two tertiary centers in Korea between 2005 and 2017. We reclassified these 136 patients using the revised Porto criteria. To estimate the population-based prevalence, we analyzed Korean administrative healthcare data between 2005 and 2016, which revealed 3,650 IBD patients, including 2,538 CD and 1,112 UC. By extrapolating the reclassified results to a population-based dataset, we estimated the prevalence of PIBD subtypes. Results: Among the 94 CD, the original diagnosis remained unchanged in 93 (98.9%), while the diagnosis of one (1.1%) patient was changed to IBDU. Among the 42 UC, the original diagnosis remained unchanged in 13 (31.0%), while the diagnoses in 11 (26.2%), 17 (40.5%), and one (2.4%) patient changed to atypical UC, IBDU, and CD, respectively. The estimated prevalences of CD, UC, atypical UC, and IBDU in the Korean population were 69.5%, 9.4%, 8.0%, and 13.1%, respectively. Conclusion: This study is the first in Korea to estimate the prevalence of pediatric IBDU. This prevalence (13.1%) aligns with findings from Western studies. Large-scale prospective multicenter studies on PIBDU are required to examine the clinical features and outcomes of this condition.
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