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Dong-Chan Oh

Ki Hong Choi, Ga Yeon Lee, Jin-Oh Choi, Eun-Seok Jeon, Hae-Young Lee, Hyun-Jai Cho, Sang Eun Lee, Min-Seok Kim, Jae-Joong Kim, Kyung-Kuk Hwang, Shung Chull Chae, Sang Hong Baek, Seok-Min Kang, Dong-Ju Choi, Byung-Su Yoo, Kye Hun Kim, Hyun-Young Park, Myeong-Chan Cho, Byung-Hee Oh
OBJECTIVE: There are conflicting results among previous studies regarding the prognosis of heart failure with preserved ejection fraction (HFpEF) compared with heart failure with reduced ejection fraction (HFrEF). This study aimed to compare the outcomes of patients with de novo acute heart failure (AHF) or acute decompensated HF (ADHF) according to HFpEF (EF≥50%), or HFrEF (EF<40%) and to define the prognosis of patients with HF with mid-range EF (HFmrEF, 40≤EF<50%). METHODS: Between March 2011 and February 2014, 5625 consecutive patients with AHF were recruited from 10 university hospitals...
October 5, 2017: Heart: Official Journal of the British Cardiac Society
Yoon Jin Choi, Dong Ho Lee, Myung Gyu Choi, Sung Joon Lee, Sung Kook Kim, Geun Am Song, Poong Lyul Rhee, Hwoon Yong Jung, Dae Hwan Kang, Yong Chan Lee, Si Hyung Lee, Suck Chei Choi, Ki Nam Shim, Sang Yong Seol, Jeong Seop Moon, Yong Woon Shin, Hyun Soo Kim, Soo Teik Lee, Jin Woong Cho, Eun Kwang Choi, Oh Young Lee, Jin Seok Jang
This study compared the efficacy of DA-9601 (Dong-A ST Co., Seoul, Korea) and its new formulation, DA-5204 (Dong-A ST Co.), for treating erosive gastritis. This phase III, randomized, multicenter, double-blind, non-inferiority trial randomly assigned 434 patients with endoscopically proven gastric mucosal erosions into two groups: DA-9601 3 times daily or DA-5,204 twice daily for 2 weeks. The final analysis included 421 patients (DA-5204, 209; DA-9601, 212). The primary endpoint (rate of effective gastric erosion healing) and secondary endpoints (cure rate of endoscopic erosion and gastrointestinal [GI] symptom relief) were assessed using endoscopy after the treatment...
November 2017: Journal of Korean Medical Science
Chan Soon Park, Jin Joo Park, Il-Young Oh, Chang-Hwan Yoon, Dong-Ju Choi, Hyun-Ah Park, Seok-Min Kang, Byung-Su Yoo, Eun-Seok Jeon, Jae-Joong Kim, Myeong-Chan Cho, Shung Chull Chae, Kyu-Hyung Ryu, Byung-Hee Oh
BACKGROUND AND OBJECTIVES: The relationship between ejection fraction (EF), N-terminal pro-brain natriuretic peptide (NT-proBNP) levels and renal function is unknown as stratified by heart failure (HF) type. We investigated their relation and the prognostic value of renal function in heart failure with preserved ejection fraction (HFpEF) vs. reduced ejection fraction (HFrEF). MATERIALS AND METHODS: NT-proBNP, glomerular filtration rate (GFR), and EF were obtained in 1,932 acute heart failure (AHF) patients...
September 2017: Korean Circulation Journal
Min-Seok Kim, Ju-Hee Lee, Eung Ju Kim, Dae-Gyun Park, Sung-Ji Park, Jin Joo Park, Mi-Seung Shin, Byung Su Yoo, Jong-Chan Youn, Sang Eun Lee, Sang Hyun Ihm, Se Yong Jang, Sang-Ho Jo, Jae Yeong Cho, Hyun-Jai Cho, Seonghoon Choi, Jin-Oh Choi, Seong Woo Han, Kyung Kuk Hwang, Eun Seok Jeon, Myeong-Chan Cho, Shung Chull Chae, Dong-Ju Choi
The prevalence of heart failure (HF) is skyrocketing worldwide, and is closely associated with serious morbidity and mortality. In particular, HF is one of the main causes for the hospitalization and mortality in elderly individuals. Korea also has these epidemiological problems, and HF is responsible for huge socioeconomic burden. However, there has been no clinical guideline for HF management in Korea. 
The present guideline provides the first set of practical guidelines for the management of HF in Korea and was developed using the guideline adaptation process while including as many data from Korean studies as possible...
September 2017: Korean Circulation Journal
Tae In Kim, Bora Shin, Geum Jin Kim, Hyukjae Choi, Chong Soon Lee, Mi Hee Woo, Dong-Chan Oh, Jong Keun Son
Three new compounds, a sesquilignan (1) and two glucosylated phenylpropanoids (2, 3), and seven known compounds (4-10), were isolated from the fruits of Illicium verum Hook. Fil. (Illiciaceae). The structures of 1-3 were determined based on one and two dimensional (1D- and 2D-) NMR data and ECD spectra analyses. Compounds 3, 5, 6, and 8-10 exhibited potent inhibitory activities against topoisomerase II with IC50 values of 54.6, 25.5, 17.9, 12.1, 0.3 and 1.0 μM, respectively, compared to etoposide, the positive control, with an IC50 of 43...
September 26, 2017: Chemical & Pharmaceutical Bulletin
Eun Ji Oh, Chan Kwon Jung, Dong-Hoon Kim, Han Kyeom Kim, Wan Seop Kim, So-Young Jin, Hye Kyoung Yoon
Background: Limited data are available on the current status of cytology practices in Korea. This nationwide study presents Korean cytology statistics from 2015. Materials and Methods: A nationwide survey was conducted in 2016 as a part of the mandatory quality-control program by the Korean Society for Cytopathology. The questionnaire was sent to 208 medical institutions performing cytopathologic examinations in Korea. Individual institutions were asked to submit their annual cytology statistical reports and gynecologic cytology-histology correlation data for 2015...
September 27, 2017: Journal of Pathology and Translational Medicine
Dong Hyun Oh, Moo Hyun Kim, Woo Yong Jeong, Yong Chan Kim, Eun Jin Kim, Je Eun Song, In Young Jung, Su Jin Jeong, Nam Su Ku, Jun Yong Choi, Young Goo Song, June Myung Kim
BACKGROUND: According to the new definition of septic shock, vasopressor therapy and hyperlactatemia are essential for diagnosis. However, there is controversy regarding the cutoff value for lactate, and prognostic factors in patients with septic shock and hypolactatemia. This study evaluated the prognostic significance of the cutoff value for lactate level in septic shock patients. METHODS: The retrospective observational cohort study enrolled 1043 patients aged ≥18 years who meet the revised definition of septic shock...
August 26, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
(no author information available yet)
BACKGROUND: CT radiation is arguably carcinogenic. Results from single-centre studies, mostly retrospective, have advocated lowering the CT radiation dose for the diagnosis of appendicitis. However, adoption of low-dose CT has been slow. We aimed to assess the effectiveness of low-dose CT compared with standard-dose CT in the diagnosis of appendicitis in adolescents and young adults. METHODS: We did this pragmatic, multicentre, randomised controlled non-inferiority trial at 20 South Korean teaching hospitals with little experience with low-dose CT...
November 2017: Lancet. Gastroenterology & Hepatology
Sandip Sengupta, Munhyung Bae, Dong-Chan Oh, Uttam Dash, Hak Joong Kim, Woon Young Song, Injae Shin, Taebo Sim
Total synthesis of the proposed structure of baulamycin A was performed. The spectral properties of the synthetic compound differ from those reported for the natural product. On the basis of comprehensive NMR study, we proposed two other possible structures for natural baulamycin A. Total syntheses of these two substances were performed, which enabled assignment of the correct structure of baulamycin A. Key features of the convergent and fully stereocontrolled route include Evans Aldol and Brown allylation reactions to construct the left fragment, a prolinol amide-derived alkylation/desymmetrization to install the methyl-substituted centers in the right fragment, and finally, a Carreira alkynylation to join both fragments...
October 2, 2017: Journal of Organic Chemistry
Soo-Min Shon, Hee Jeong Jang, Dawid Schellingerhout, Jeong-Yeon Kim, Wi-Sun Ryu, Su-Kyoung Lee, Jiwon Kim, Jin-Yong Park, Ji Hye Oh, Jeong Wook Kang, Kang-Hoon Je, Jung E Park, Kwangmeyung Kim, Ick Chan Kwon, Juneyoung Lee, Matthias Nahrendorf, Jong-Ho Park, Dong-Eog Kim
BACKGROUND: The aim of this study is to identify the principal circulating factors that modulate atheromatous matrix metalloproteinase (MMP) activity in response to diet and exercise.Methods and Results:Apolipoprotein-E knock-out (ApoE(-/-)) mice (n=56) with pre-existing plaque, fed either a Western diet (WD) or normal diet (ND), underwent either 10 weeks of treadmill exercise or had no treatment. Atheromatous MMP activity was visualized using molecular imaging with a MMP-2/9 activatable near-infrared fluorescent (NIRF) probe...
September 25, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
Gyu Chul Oh, Hae-Young Lee, Wook Jin Chung, Ho-Joong Youn, Eun-Joo Cho, Ki-Chul Sung, Shung Chull Chae, Byung-Su Yoo, Chang Gyu Park, Soon Jun Hong, Young Kwon Kim, Taek-Jong Hong, Dong-Ju Choi, Min Su Hyun, Jong Won Ha, Young Jo Kim, Youngkeun Ahn, Myeong Chan Cho, Soon-Gil Kim, Jinho Shin, Sungha Park, Il-Suk Sohn, Chong-Jin Kim
BACKGROUND: Hypertension is a risk factor for coronary heart disease and stroke, and is one of the leading causes of death. Although over a billion people are affected worldwide, only half of them receive adequate treatment. Current guidelines on antihypertensive treatment recommend combination therapy for patients not responding to monotherapy, but as the number of pills increase, patient compliance tends to decrease. As a result, fixed-dose combination drugs with different antihypertensive agents have been developed and widely used in recent years...
2017: Clinical Hypertension
Hyun Bong Park, Jin-Soo Park, Seung Il Lee, Bora Shin, Dong-Chan Oh, Hak Cheol Kwon
Despite numerous efforts to discover novel bioactive products from microorganisms, previously reported compounds are repetitively reisolated. A new polyketide glycoside, gordonic acid (1), isolated from the mixed culture of two Gram-positive bacteria, Gordonia sp. KMC005 and Streptomyces tendae KMC006, is reported. The structure of 1 was characterized as an acyclic polyene polyketide substituted with a β-d-digitoxopyranose through NMR, HR-ESI-QTOF-MS, IR, and UV spectral data. The stereochemistry for 1 was determined by Mosher's method followed by 2D NOESY analysis and by NMR chemical shift calculations supported by DP4 analysis...
August 28, 2017: Journal of Natural Products
Jin Joo Park, Young-Jin Cho, Il-Young Oh, Hyun-Ah Park, Hae-Young Lee, Kye Hun Kim, Byung-Su Yoo, Seok-Min Kang, Sang Hong Baek, Eun-Seok Jeon, Jae-Joong Kim, Myeong-Chan Cho, Shung Chull Chae, Byung-Hee Oh, Dong-Ju Choi
BACKGROUND: Hyponatremia is a well-known risk factor for worse outcomes in heart failure (HF) patients. The impact of hyponatremia according to the ejection fraction (EF) is unclear. We evaluated the prognostic value of hyponatremia according to HF type. METHODS AND RESULTS: The Korea Acute Heart Failure (KorAHF) registry consecutively enrolled 5625 patients. Hyponatremia was defined as serum sodium level<135mmol/L at hospital admission. HF with preserved and reduced ejection fraction were defined as an LVEF ≥50% and LVEF ≤40%, respectively...
December 1, 2017: International Journal of Cardiology
Ji Woon Yea, Jae Won Park, Sung Kyu Kim, Dong Youn Kim, Jae Gu Kim, Chan Young Seo, Won Hyo Jeong, Man Youl Jeong, Se An Oh
This study evaluated the feasibility of utilizing a 3D-printed anthropomorphic patient-specific head phantom for patient-specific quality assurance (QA) in intensity-modulated radiotherapy (IMRT). Contoured left and right head phantoms were converted from DICOM to STL format. Fused deposition modeling (FDM) was used to construct an anthropomorphic patient-specific head phantom with a 3D printer. An established QA technique and the patient-specific head phantom were used to compare the calculated and measured doses...
2017: PloS One
Jung-Hyo Cho, Dal-Seok Oh, Sang-Hoon Hong, Heung Ko, Nam-Hun Lee, Sang-Eun Park, Chang-Woo Han, Seung-Mo Kim, Young-Chul Kim, Kang-San Kim, Chang-Won Choi, Seon-My Shin, Ki-Tae Kim, Hong-Sik Choi, Jang-Hoon Lee, Jun-Young Kim, Ji-Young Kang, Dong-Soo Lee, Yo-Chan Ahn, Chang-Gue Son
Discrepant incidence has been reported regarding the incidence of herb-induced liver injury (HILI). To address the growing worldwide concern of HILI, we evaluated the risk of HILI in a nationwide prospective study. Between April 2013 and January 2016, 1001 inpatients (360 males and 641 females) from 10 tertiary hospitals throughout South Korea were treated with herbal drugs and had their liver enzymes periodically measured. A total of six patients met the criteria for HILI with RUCAM scores ranging from 4 to 7...
June 20, 2017: Archives of Toxicology
Tae Sung Kim, Yern-Hyerk Shin, Hye-Mi Lee, Jin Kyung Kim, Jin Ho Choe, Ji-Chan Jang, Soohyun Um, Hyo Sun Jin, Masaaki Komatsu, Guang-Ho Cha, Han-Jung Chae, Dong-Chan Oh, Eun-Kyeong Jo
The induction of host cell autophagy by various autophagy inducers contributes to the antimicrobial host defense against Mycobacterium tuberculosis (Mtb), a major pathogenic strain that causes human tuberculosis. In this study, we present a role for the newly identified cyclic peptides ohmyungsamycins (OMS) A and B in the antimicrobial responses against Mtb infections by activating autophagy in murine bone marrow-derived macrophages (BMDMs). OMS robustly activated autophagy, which was essentially required for the colocalization of LC3 autophagosomes with bacterial phagosomes and antimicrobial responses against Mtb in BMDMs...
June 13, 2017: Scientific Reports
Jungwoo Kim, Daniel Shin, Seong-Hwan Kim, Wanki Park, Yoonho Shin, Won Kyung Kim, Sang Kook Lee, Ki-Bong Oh, Jongheon Shin, Dong-Chan Oh
Chemical investigation of a halophilic actinomycete strain belonging to the genus Nocardiopsis inhabiting a hypersaline saltern led to the discovery of new 18-membered macrolides with nitrile functionality, borrelidins C-E (1-3), along with a previously reported borrelidin (4). The planar structures of borrelidins C-E, which are new members of the rare borrelidin class of antibiotics, were elucidated by NMR, mass, IR, and UV spectroscopic analyses. The configurations of borrelidines C-E were determined by the interpretation of ROESY NMR spectra, J-based configuration analysis, a modified Mosher's method, and CD spectroscopic analysis...
June 6, 2017: Marine Drugs
Sang Eun Lee, Hae-Young Lee, Hyun-Jai Cho, Won-Seok Choe, Hokon Kim, Jin Oh Choi, Eun-Seok Jeon, Min-Seok Kim, Jae-Joong Kim, Kyung-Kuk Hwang, Shung Chull Chae, Sang Hong Baek, Seok-Min Kang, Dong-Ju Choi, Byung-Su Yoo, Kye Hun Kim, Hyun-Young Park, Myeong-Chan Cho, Byung-Hee Oh
BACKGROUND AND OBJECTIVES: The burden of heart failure has increased in Korea. This registry aims to evaluate demographics, clinical characteristics, management, and long-term outcomes in patients hospitalized for acute heart failure (AHF). SUBJECTS AND METHODS: We prospectively enrolled a total of 5625 consecutive subjects hospitalized for AHF in one of 10 tertiary university hospitals from March 2011 to February 2014. Descriptive statistics were used to determine the baseline characteristics of the study population and to compare them with those from other registries...
May 2017: Korean Circulation Journal
Hee Ju Yoo, Woo Jung Park, Gyu-Myung Lee, Chang-Sik Oh, Inhwa Yeam, Dong-Chan Won, Chang Kil Kim, Je Min Lee
Carotenoids are essential for plant and animal nutrition, and are important factors in the variation of pigmentation in fruits, leaves, and flowers. Tomato is a model crop for studying the biology and biotechnology of fleshy fruits, particularly for understanding carotenoid biosynthesis. In commercial tomato cultivars and germplasms, visual phenotyping of the colors of ripe fruits can be done easily. However, subsequent analysis of metabolic profiling is necessary for hypothesizing genetic factors prior to performing time-consuming genetic analysis...
May 8, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jin Young Ahn, Hea Won Ann, Yongduk Jeon, Mi Young Ahn, Dong Hyun Oh, Yong Chan Kim, Eun Jin Kim, Je Eun Song, In Young Jung, Moo Hyun Kim, Wooyoung Jeong, Nam Su Ku, Su Jin Jeong, Jun Yong Choi, Dongeun Yong, Young Goo Song, June Myung Kim
BACKGROUND: The incidence of Proteus mirabilis antimicrobial resistance, especially that mediated by extended-spectrum β-lactamases (ESBLs), has increased. We investigated the impact of ESBL production on the mortality of patients with P. mirabilis bacteremia in Korea. METHODS: Patients diagnosed with P. mirabilis bacteremia between November 2005 and December 2013 at a 2000-bed tertiary care center in South Korea were included in this study. Phenotypic and molecular analyses were performed to assess ESBL expression...
May 3, 2017: BMC Infectious Diseases
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