76
|
Lim HK, Choi J, Kim D, Bae SM, Kim DK, Choi IY, Kim HH. Single-and repeat-dose toxicity of HM10760A, a long-acting erythropoietin, in rats and monkeys. Toxicol Appl Pharmacol 2020; 402:115126. [PMID: 32645313 DOI: 10.1016/j.taap.2020.115126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 06/18/2020] [Accepted: 06/27/2020] [Indexed: 11/17/2022]
Abstract
Anemia is a frequent complication of chronic kidney disease (CKD) that causes an increase in morbidity and mortality and accelerates the rate of disease progression. Treatment with recombinant human erythropoietin (rhEPO) is a major breakthrough in the therapy of renal anemia. HM10760A, a long-acting EPO, has been developed as a treatment for anemia in CKD patients. A series of preclinical toxicology studies, such as acute, 4 week repeat-dose, and 13 week repeat-dose, was completed to support the safety of human exposure to HM10760A for up to 13 weeks. The rodent and non-rodent species used in the pivotal preclinical general toxicity studies were rats and monkeys, respectively. A once-a-week or once-every-two-week i.v dosing regimen was applied for 4 week and 13 week repeat-dose toxicity studies, respectively, in consideration of the expected administration frequency in humans. Based on the 13 week repeat-dose toxicity studies, 2.61 μg/kg and 22.03 μg/kg can be considered as the NOAELs (no observed adverse effect levels) in rats and monkeys, respectively. Almost all observations recorded at the low- and mid-dose levels are typical pharmacological effects of EPO and not uniquely attributed HM10760A toxicity. To account for the differences between human being and animal physiologies, the safety of HM10760A needs to be further confirmed in future clinical studies.
Collapse
|
77
|
Vijayalakshmi S, Adeyemi DE, Choi IY, Sultan G, Madar IH, Park MK. Comprehensive in silico analysis of lactic acid bacteria for the selection of desirable probiotics. Lebensm Wiss Technol 2020; 130:109617. [DOI: https:/doi.10.1016/j.lwt.2020.109617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/11/2024]
|
78
|
John O, Schaper L, Wong CP, Siribaddana P, Choi IY, Marcelo A, Dissanayake VHW. APAMI. Yearb Med Inform 2020. [DOI: 10.1055/s-0040-1701977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
|
79
|
Choi IY, Lim H, Huynh A, Schofield J, Cho HJ, Lee H, Andersen P, Shin JH, Heo WD, Hyun SH, Kim YJ, Oh Y, Kim H, Lee G. Novel culture system via wirelessly controllable optical stimulation of the FGF signaling pathway for human and pig pluripotency. Biomaterials 2020; 269:120222. [PMID: 32736809 DOI: 10.1016/j.biomaterials.2020.120222] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 07/01/2020] [Accepted: 07/02/2020] [Indexed: 12/31/2022]
Abstract
Stem cell fate is largely determined by cellular signaling networks and is heavily dependent on the supplementation of exogenous recombinant proteins into culture media; however, uneven distribution and inconsistent stability of recombinant proteins are closely associated with the spontaneous differentiation of pluripotent stem cells (PSCs) and result in significant costs in large-scale manufacturing. Here, we report a novel PSC culture system via wirelessly controllable optical activation of the fibroblast growth factor (FGF) signaling pathway without the need for supplementation of recombinant FGF2 protein, a key molecule for maintaining pluripotency of PSCs. Using a fusion protein between the cytoplasmic region of the FGF receptor-1 and a light-oxygen-voltage domain, we achieved tunable, blue light-dependent activation of FGF signaling in human and porcine PSCs. Our data demonstrate that a highly controllable optical stimulation of the FGF signaling pathway is sufficient for long-term maintenance of PSCs, without the loss of differentiation potential into three germ layers. This culture system will be a cost-effective platform for a large-scale stem cell culture.
Collapse
|
80
|
Choi B, Choi IY, Cha SH, Yeom SK, Chung HH, Lee SH, Cha J, Lee JH. Feasibility of computed tomography texture analysis of hepatic fibrosis using dual-energy spectral detector computed tomography. Jpn J Radiol 2020; 38:1179-1189. [PMID: 32666182 DOI: 10.1007/s11604-020-01020-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 07/06/2020] [Indexed: 12/01/2022]
Abstract
PURPOSE To evaluate feasibility of computer tomography texture analysis (CTTA) at different energy level using dual-energy spectral detector CT for liver fibrosis. MATERIALS AND METHODS Eighty-seven patients who underwent a spectral CT examination and had a reference standard of liver fibrosis (histopathologic findings, n = 61, or clinical findings for normal, n = 26) were included. Mean gray-level intensity, mean number of positive pixels (MPP), entropy, skewness, and kurtosis using commercially available software (TexRAD) were compared at different energy levels. Optimal CTTA parameter cutoffs to diagnose liver fibrosis were evaluated. CTTA parameters at different energy levels correlated with liver fibrosis. The association of CTTA parameters with energy level was evaluated. RESULTS Mean gray-level intensity, skewness, kurtosis, and entropy showed significant differences between patients with and without clinically significant hepatic fibrosis (P < 0.05). Mean gray-level intensity at 50 keV was significantly positively correlated with liver fibrosis (ρ = 0.502, P < 0.001). To diagnose stages F2-F4, entropy and mean gray-level intensity at low keV level showed the largest area under the curve (AUC; 0.79 and 0.79). Estimated marginal means (EMMs) of mean gray-level intensity showed prominent differences at low energy levels. CONCLUSION CTTA parameters from different keV levels demonstrated meaningful accuracy for diagnosis of liver fibrosis or clinically significant hepatic fibrosis.
Collapse
|
81
|
Sun C, Choi IY, Gonzalez YIR, Andersen P, Talbot CC, Iyer SR, Lovering RM, Wagner KR, Lee G. Duchenne muscular dystrophy hiPSC-derived myoblast drug screen identifies compounds that ameliorate disease in mdx mice. JCI Insight 2020; 5:134287. [PMID: 32343677 PMCID: PMC7308059 DOI: 10.1172/jci.insight.134287] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 04/23/2020] [Indexed: 12/18/2022] Open
Abstract
Duchenne muscular dystrophy (DMD) is the most common muscular dystrophy. In the present study, when human induced pluripotent stem cells (hiPSCs) were differentiated into myoblasts, the myoblasts derived from DMD patient hiPSCs (DMD hiPSC-derived myoblasts) exhibited an identifiable DMD-relevant phenotype: myogenic fusion deficiency. Based on this model, we developed a DMD hiPSC-derived myoblast screening platform employing a high-content imaging (BD Pathway 855) approach to generate parameters describing morphological as well as myogenic marker protein expression. Following treatment of the cells with 1524 compounds from the Johns Hopkins Clinical Compound Library, compounds that enhanced myogenic fusion of DMD hiPSC-derived myoblasts were identified. The final hits were ginsenoside Rd and fenofibrate. Transcriptional profiling revealed that ginsenoside Rd is functionally related to FLT3 signaling, while fenofibrate is linked to TGF-β signaling. Preclinical tests in mdx mice showed that treatment with these 2 hit compounds can significantly ameliorate some of the skeletal muscle phenotypes caused by dystrophin deficiency, supporting their therapeutic potential. Further study revealed that fenofibrate could inhibit mitochondrion-induced apoptosis in DMD hiPSC-derived cardiomyocytes. We have developed a platform based on DMD hiPSC-derived myoblasts for drug screening and identified 2 promising small molecules with in vivo efficacy.
Collapse
|
82
|
Lee C, Choi IY, Park DH, Park MK. Isolation and characterization of a novel Escherichia coli O157:H7-specific phage as a biocontrol agent. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2020; 18:189-199. [PMID: 32399231 PMCID: PMC7203308 DOI: 10.1007/s40201-020-00452-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2019] [Accepted: 01/20/2020] [Indexed: 05/05/2023]
Abstract
PURPOSE Escherichia coli O157:H7 is one of the major foodborne pathogens of global public concern. Bacteriophages (phages) have emerged as a promising alternative to antibiotics for controlling pathogenic bacteria. Here, a lytic E. coli O157:H7-specific phage (KFS-EC) was isolated, identified, and characterized to evaluate its potential as a biocontrol agent for E. coli O157:H7. METHODS KFS-EC was isolated from slaughterhouse in Korea. Morphological analysis, genomic analysis and several physiological tests were performed to identify and characterize the KFS-EC. RESULTS A specificity test indicated KFS-EC was strictly specific to E. coli O157:H7 strains among 60 bacterial strains tested. Morphological and phylogenetic analyses confirmed that KFS-EC belongs to the Rb49virus genus, Tevenvirinae subfamily, and the Myoviridae family of phages. KFS-EC genome consists of 164,725 bp and a total of 270 coding sequence features, of which 114 open reading frames (ORFs) were identified as phage functional genes. KFS-EC does not contain genes encoding lysogenic property and pathogenicity, which ensure its safe application. KFS-EC was relatively stable (~1 log decrease) under stressed conditions such as temperatures (20 °C-50 °C), pHs (3-11), organic solvents (ethanol and chloroform), and biocides (0.1% citric acid, 1% citric acid, and 0.1% peracetic acid). KFS-EC was able to inhibit E. coli O157:H7 efficiently at a multiplicity of infection (MOI) of 0.01 for 8 h with greater inhibitory effect and durability and was stable at 4 °C and 22 °C over a 12-week storage period. CONCLUSIONS Our results suggest that KFS-EC could be used as a biocontrol agent to E. coli O157:H7.
Collapse
|
83
|
Chun JW, Park CH, Kim JY, Choi J, Cho H, Jung DJ, Ahn KJ, Choi JS, Kim DJ, Choi IY. Altered core networks of brain connectivity and personality traits in internet gaming disorder. J Behav Addict 2020; 9:298-311. [PMID: 32592635 PMCID: PMC8939405 DOI: 10.1556/2006.2020.00014] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 09/20/2019] [Accepted: 03/01/2020] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND AND AIMS Although the Internet has provided convenience and efficiency in many areas of everyday life, problems stemming from Internet use have also been identified, such as Internet gaming disorder (IGD). Internet addiction, which includes IGD, can be viewed as a behavioral addiction or impulse control disorder. This study investigated the altered functional and effective connectivity of the core brain networks in individuals with IGD compared to healthy controls (HCs). METHODS Forty-five adults with IGD and 45 HCs were included in this study. To examine the brain networks related to personality traits that influence problematic online gaming, the left and right central executive network (CEN) and the salience network (SN) were included in the analysis. Also, to examine changes in major brain network topographies, we analyzed the default mode network (DMN). RESULTS IGD participants showed lower functional connectivity between the dorsal lateral prefrontal cortex (DLPFC) and other regions in the CEN than HC participants during resting state. Also, IGD participants revealed reduced functional connectivity between the dorsal anterior cingulate cortex and other regions in the SN and lower functional connectivity in the medial prefrontal cortex of the anterior DMN. Notably, in IGD individuals but not HC individuals, there was a positive correlation between IGD severity and effective connectivity and a positive correlation between reward sensitivity and effective connectivity within the ventral striatum of the SN. CONCLUSIONS Problematic online gaming was associated with neurofunctional alterations, impairing the capacity of core brain networks.
Collapse
|
84
|
Lim HK, Hong SH, Bae SM, Choi IY, Kim HH. A Liquid Formulation of a Long-acting Erythropoietin Conjugate. BIOTECHNOL BIOPROC E 2020. [DOI: 10.1007/s12257-019-0194-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
|
85
|
Choi IY, Lim H, Cho HJ, Oh Y, Chou BK, Bai H, Cheng L, Kim YJ, Hyun S, Kim H, Shin JH, Lee G. Transcriptional landscape of myogenesis from human pluripotent stem cells reveals a key role of TWIST1 in maintenance of skeletal muscle progenitors. eLife 2020; 9:e46981. [PMID: 32011235 PMCID: PMC6996923 DOI: 10.7554/elife.46981] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Accepted: 01/14/2020] [Indexed: 12/15/2022] Open
Abstract
Generation of skeletal muscle cells with human pluripotent stem cells (hPSCs) opens new avenues for deciphering essential, but poorly understood aspects of transcriptional regulation in human myogenic specification. In this study, we characterized the transcriptional landscape of distinct human myogenic stages, including OCT4::EGFP+ pluripotent stem cells, MSGN1::EGFP+ presomite cells, PAX7::EGFP+ skeletal muscle progenitor cells, MYOG::EGFP+ myoblasts, and multinucleated myotubes. We defined signature gene expression profiles from each isolated cell population with unbiased clustering analysis, which provided unique insights into the transcriptional dynamics of human myogenesis from undifferentiated hPSCs to fully differentiated myotubes. Using a knock-out strategy, we identified TWIST1 as a critical factor in maintenance of human PAX7::EGFP+ putative skeletal muscle progenitor cells. Our data revealed a new role of TWIST1 in human skeletal muscle progenitors, and we have established a foundation to identify transcriptional regulations of human myogenic ontogeny (online database can be accessed in http://www.myogenesis.net/).
Collapse
|
86
|
Choi IY, Chung HH, Lee SH, Yeom SK, Jung YK, Park SW. Feasibility of Changing Intra-Arterial Flow Direction by Temporary Occlusion Using Retrievable Coils: Study with a Normal Pig Model. J Vasc Interv Radiol 2020; 31:341-346. [DOI: 10.1016/j.jvir.2019.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 07/10/2019] [Accepted: 07/11/2019] [Indexed: 11/27/2022] Open
|
87
|
Park JS, Koo KC, Choi IY, Lee JY, Hong JH, Kim CS, Lee HM, Hong SK, Byun SS, Rha KH, Chung BH, Lee KS. Stratification based on adverse laboratory/pathological features for predicting overall survival in patients undergoing radical prostatectomy: A K-CaP registry-based analysis. Medicine (Baltimore) 2019; 98:e17931. [PMID: 31702677 PMCID: PMC6855645 DOI: 10.1097/md.0000000000017931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
When making clinical decisions concerning additional treatment for patients who have undergone radical prostatectomy (RP), adverse laboratory/pathological features are considered major factors. We investigated and compared the prognostic efficacy of adverse laboratory/pathological features in predicting overall survival (OS) and biochemical failure (BCF) in these patients.The Korean Prostate Cancer Database was used to identify patients undergoing RP between May 2001 and April 2013. Patients with incomplete clinicopathological data or positive lymphadenectomy results were excluded. Finally, 4486 patients included in the final analysis were categorized based on their adverse laboratory/pathological features.Adverse pathological features and detectable prostate-specific antigen (PSA) levels 6 weeks after surgery were observed in 1977 (44.1%) and 634 (14.1%) patients, respectively. PSA levels, pathological Gleason score ≥8, adverse pathological features [positive surgical margin (PSM), seminal vesicle invasion (SVI), and extracapsular extension (ECE)], and adverse laboratory features (detectable PSA levels after 6 weeks) together were significant predictors of BCF-free survival (BCFFS). SVI was identified as a predictor of OS. Additionally, patients with ECE, PSM, and detectable PSA levels after 6 weeks, but without SVI, showed similar OS to those without ECE, PSM, and detectable PSA levels after 6 weeks and with SVI (log-rank test, P = .976).We successfully stratified patients based on adverse laboratory/pathological features after RP and demonstrated that these are important prognostic factors for OS and BCFFS. Additionally, we identified the criteria for selecting appropriate patients for undergoing additional treatment based on OS and BCFFS.
Collapse
|
88
|
Rosenstock J, Sorli CH, Trautmann ME, Morales C, Wendisch U, Dailey G, Hompesch M, Choi IY, Kang J, Stewart J, Yoon KH. Once-Weekly Efpeglenatide Dose-Range Effects on Glycemic Control and Body Weight in Patients With Type 2 Diabetes on Metformin or Drug Naive, Referenced to Liraglutide. Diabetes Care 2019; 42:1733-1741. [PMID: 31320446 DOI: 10.2337/dc18-2648] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Accepted: 06/23/2019] [Indexed: 02/03/2023]
Abstract
OBJECTIVE To explore the efficacy, safety, and tolerability of once-weekly efpeglenatide, a long-acting glucagon-like peptide 1 receptor agonist (GLP-1 RA), in early type 2 diabetes (T2D) (drug naive or on metformin monotherapy). RESEARCH DESIGN AND METHODS EXCEED 203 was a 12-week, randomized, placebo-controlled, double-blind, parallel-group, dose-ranging study of efpeglenatide once weekly referenced to open-label liraglutide 1.8 mg (exploratory analysis). Participants, ∼90% on metformin monotherapy, were randomized to one of five efpeglenatide doses (0.3, 1, 2, 3, or 4 mg q.w.; n = 181), placebo (n = 37), or liraglutide (≤1.8 mg daily; n = 36). The primary efficacy end point was change in HbA1c from baseline to week 13. RESULTS From a baseline HbA1c of 7.7-8.0% (61.0-63.9 mmol/mol), all efpeglenatide doses ≥1 mg significantly reduced HbA1c versus placebo (placebo-adjusted least squares [LS] mean changes 0.6-1.2%, P < 0.05 for all) to a final HbA1c of 6.3-6.8% (45.4-50.6 mmol/mol); masked efpeglenatide 4 mg was noninferior to open-label liraglutide. Greater proportions treated with efpeglenatide ≥1 mg than placebo achieved HbA1c <7% (61-72% vs. 24%, P < 0.05 for all), and greater reductions in body weight were observed with efpeglenatide 3 and 4 mg versus placebo (placebo-adjusted LS mean differences -1.4 and -2.0 kg, respectively, P < 0.05 for both). Rates of nausea and vomiting were consistent with other GLP-1 RAs and rapidly subsided after the initial 2 weeks. No neutralizing antibodies were detected with efpeglenatide. CONCLUSIONS Efpeglenatide once weekly led to significant reductions in HbA1c and weight, with a safety profile consistent with the GLP-1 RA class in patients with early T2D mostly on metformin monotherapy.
Collapse
|
89
|
Yook IH, Park SJ, Choi MJ, Kim DJ, Choi IY. Factors Affecting Smartphone Usage Self-Report Levels. Stud Health Technol Inform 2019; 264:1937-1938. [PMID: 31438416 DOI: 10.3233/shti190722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
For the treatment of smartphone addiction, it is important to understand users' smartphone usage patterns. Most of the studies are based on self-report surveys. However, there are differences between self-reported usage and real usage. For a better understanding of usage patterns, this study identified demographic and social factors that affect smartphone usage self-report levels. Also, it was confirmed that the influencing factors differ depending on the smartphone usage content by application category.
Collapse
|
90
|
Lee SJ, Yu SH, Kim Y, Hong JH, Kim CS, Seo SI, Jeong CW, Byun SS, Chung BH, Lee JY, Choi IY. Development of Integrated Data and Prediction System Platform for the Localized Prostate Cancer. Stud Health Technol Inform 2019; 264:1506-1507. [PMID: 31438204 DOI: 10.3233/shti190507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
In this study, we built a multi-center integrated database platform of localized prostate cancer and developed biochemical recurrence (BCR) prediction system with Gradient Boosted Regression model using Korean Prostate Cancer Registry (KPCR) database. This platform will facilitate clinical management of patients with prostate cancer, and it will also help develop appropriate treatment of prostate cancer.
Collapse
|
91
|
Choi IY, Yeom SK, Cha J, Cha SH, Lee SH, Chung HH, Lee CM, Choi J. Feasibility of using computed tomography texture analysis parameters as imaging biomarkers for predicting risk grade of gastrointestinal stromal tumors: comparison with visual inspection. Abdom Radiol (NY) 2019; 44:2346-2356. [PMID: 30923842 DOI: 10.1007/s00261-019-01995-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE To evaluate the feasibility of using computed tomography texture analysis (CTTA) parameters for predicting malignant risk grade and mitosis index of gastrointestinal stromal tumors (GISTs), compared with visual inspection. METHOD AND MATERIALS CTTA was performed on portal phase CT images of 145 surgically confirmed GISTs (mean size: 42.9 ± 37.5 mm), using TexRAD software. Mean, standard deviation, entropy, mean of positive pixels (MPP), skewness, and kurtosis of CTTA parameters, on spatial scaling factor (SSF), 2-6 were compared by risk grade, mitosis rate, and the presence or absence of necrosis on visual inspection. CTTA parameters were correlated with risk grade. Diagnostic performance was evaluated with receiver operating characteristic curve analysis. Enhancement pattern, necrosis, heterogeneity, calcification, growth pattern, and mucosal ulceration were subjectively evaluated by two observers. RESULTS Three to four parameters at different scales were significantly different according to the risk grade, mitosis rate, and the presence or absence of necrosis (p < 0.041). MPP at fine or medium scale (r = - 0.547 to - 393) and kurtosis at coarse scale (r = 0.424-0.454) correlated significantly with risk grade (p < 0.001). HG-GIST was best differentiated from LG-GIST by MPP at SSF 2 (AUC, 0.782), and kurtosis at SSF 4 (AUC, 0.779) (all p < 0.001). CT features predictive of HG-GIST were density lower than or equal to that of the erector spinae muscles on enhanced images (OR 2.1; p = 0.037; AUC, 0.59), necrosis (OR, 6.1; p < 0.001; AUC, 0.70), heterogeneity (OR, 4.3; p < 0.001; AUC, 0.67), and mucosal ulceration (OR, 3.3; p = 0.002; AUC, 0.62). CONCLUSION Using TexRAD, MPP and kurtosis are feasible in predicting risk grade and mitosis index of GISTs. CTTA demonstrated meaningful accuracy in preoperative risk stratification of GISTs.
Collapse
|
92
|
Gwak KM, Choi IY, Lee J, Oh JH, Park MK. Isolation and Characterization of a Lytic and Highly Specific Phage against Yersinia enterocolitica as a Novel Biocontrol Agent. J Microbiol Biotechnol 2019; 28:1946-1954. [PMID: 30270603 DOI: 10.4014/jmb.1808.08001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
The aim of this study was to isolate and characterize a lytic Yersinia enterocolitica-specific phage (KFS-YE) as a biocontrol agent. KFS-YE was isolated and purified with the final concentration of (11.72 ± 0.03) log PFU/ml from poultry. As observed by transmission electron microscopy, KFS-YE consisted of an icosahedral head and a contractile tail, and was classified in the Myoviridae family. KFS-YE showed excellent narrow specificity against Y. enterocolitica only. Its lytic activity was stable at wide ranges of pH (4-11) and temperature (4-50°C). The latent period and burst size of KFS-YE were determined to be 45 min and 38 PFU/cell, respectively. KFS-YE showed relatively robust storage stability at -20, 4, and 22°C for 40 weeks. KFS-YE demonstrated a bactericidal effect in vitro against Y. enterocolitica and provided excellent efficiency with a multiplicity of infection as low as 0.01. This study demonstrated the excellent specificity, stability, and efficacy of KFS-YE as a novel biocontrol agent. KFS-YE may be employed as a practical and promising biocontrol agent against Y. enterocolitica in food.
Collapse
|
93
|
Rho MJ, Park J, Na E, Jeong JE, Kim JK, Kim DJ, Choi IY. Types of problematic smartphone use based on psychiatric symptoms. Psychiatry Res 2019; 275:46-52. [PMID: 30878856 DOI: 10.1016/j.psychres.2019.02.071] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 02/22/2019] [Accepted: 02/27/2019] [Indexed: 02/08/2023]
Abstract
To provide appropriate solutions for problematic smartphone use, we need to first understand its types. This study aimed to identify types of problematic smartphone use based on psychiatric symptoms, using the decision tree method. We recruited 5,372 smartphone users from online surveys conducted between February 3 and February 22, 2016. Based on scores on the Korean Smartphone Addiction Proneness Scale for Adults (S-Scale), 974 smartphone users were assigned to the smartphone-dependent group and 4398 users were assigned to the normal group. The data-mining technique of C5.0 decision tree was applied. We used 15 input variables, including demographic and psychological factors. Four psychiatric variables emerged as the most important predictors: self-control (Sc; 66%), anxiety (Anx; 25%), depression (Dep; 7%), and dysfunctional impulsivities (Imp; 3%). We identified the following five types of problematic smartphone use: (1) non-comorbid, (2) self-control, (3) Sc + Anx, (4) Sc + Anx + Dep, and (5) Sc + Anx + Dep + Imp. We found that 74% of smartphone-dependent users had psychiatric symptoms. The ratio of participants belonging to the non-comorbid and self-control types was 64%. We proposed that these types of problematic smartphone use may be used for the development of an appropriate service for controlling and preventing such behaviors in adults.
Collapse
|
94
|
Lee SJ, Choi MJ, Rho MJ, Kim DJ, Choi IY. Corrigendum: Factors Affecting User Acceptance in Overuse of Smartphones in Mobile Health Services: An Empirical Study Testing a Modified Integrated Model in South Korea. Front Psychiatry 2019; 10:259. [PMID: 31114514 PMCID: PMC6503637 DOI: 10.3389/fpsyt.2019.00259] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 04/04/2019] [Indexed: 11/13/2022] Open
Abstract
[This corrects the article DOI: 10.3389/fpsyt.2018.00658.].
Collapse
|
95
|
Lee SJ, Choi MJ, Rho MJ, Kim DJ, Choi IY. Factors Affecting User Acceptance in Overuse of Smartphones in Mobile Health Services: An Empirical Study Testing a Modified Integrated Model in South Korea. Front Psychiatry 2018; 9:658. [PMID: 30631283 PMCID: PMC6315168 DOI: 10.3389/fpsyt.2018.00658] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 11/19/2018] [Indexed: 11/13/2022] Open
Abstract
Smartphones have become crucial in people's everyday lives, including in the medical field. However, as people become close to their smartphones, this leads easily to overuse. Overuse leads to fatigue due to lack of sleep, depressive symptoms, and social relationship failure, and in the case of adolescents, it hinders academic achievement. Self-control solutions are needed, and effective tools can be developed through behavioral analysis. Therefore, the aim of this study was to investigate the determinants of users' intentions to use m-Health for smartphone overuse interventions. A research model was based on TAM and UTAUT, which were modified to be applied to the case of smartphone overuse. The studied population consisted of 400 randomly selected smartphone users aged from 19 to 60 years in South Korea. Structural equation modeling was conducted between variables to test the hypotheses using a 95% confidence interval. Perceived ease of use had a very strong direct positive association with perceived usefulness, and perceived usefulness had a very strong direct positive association with behavioral intention to use. Resistance to change had a direct positive association with behavioral intention to use and, lastly, social norm had a very strong direct positive association with behavioral intention to use. The findings that perceived ease of use influenced perceived usefulness, that perceived usefulness influenced behavioral intention to use, and social norm influenced behavioral intention to use were in accordance with prior related research. Other results that were not consistent with previous research imply that these are unique behavioral findings regarding smartphone overuse. This research identifies the critical factors that need to be considered when implementing systems or solutions in the future for tackling the issue of smartphone overuse.
Collapse
|
96
|
Yang SK, Lee EJ, Song YH, Kim JE, Choi IY, Lee DC. Does the Severity of Type 2 Diabetes Affect Yearly Diabetic Retinal Examination?: A Cross Sectional Analysis of the Korea National Health and Nutrition Examination Survey 2013-2015. ACTA ACUST UNITED AC 2018. [DOI: 10.21215/kjfp.2018.8.5.793] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
97
|
Hah YS, Lee KS, Choi IY, Lee JY, Hong JH, Kim CS, Lee HM, Hong SK, Byun SS, Lee SH, Rha KH, Chung BH, Koo KC. Effects of age and comorbidity on survival vary according to risk grouping among patients with prostate cancer treated using radical prostatectomy: A retrospective competing-risk analysis from the K-CaP registry. Medicine (Baltimore) 2018; 97:e12766. [PMID: 30334964 PMCID: PMC6211932 DOI: 10.1097/md.0000000000012766] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
A multicenter Korean Prostate Cancer Database (K-CaP) has been established to provide information regarding Korean patients with prostate cancer (PCa). We used the K-CaP registry to investigate the value of age and comorbidity for predicting cancer-specific mortality (CSM) and other-cause mortality (OCM) according to risk grouping.The K-CaP registry includes 2253 patients who underwent radical prostatectomy (RP) between May 2001 and April 2013 at 5 institutions. Preoperative clinicopathologic data were collected and stratified according to the National Comprehensive Cancer Network risk criteria. Survival was evaluated using Gray's modified log-rank test according to risk category, age (<70 years vs ≥70 years), and Charlson comorbidity index (CCI) (0 vs ≥1).The median follow-up was 55.0 months (interquartile range: 42.0-70.0 months). Competing-risk regression analysis revealed that, independent of CCI, ≥70-year-old high-risk patients had significantly greater CSM than <70-year-old high-risk patients (P = .019). However, <70-year-old high-risk patients with a CCI of ≥1 had similar CSM relative to ≥70-year-old patients. Survival was not affected by age or CCI among low-risk or intermediate-risk patients. Multivariate analysis revealed that a CCI of ≥1 was independently associated with a higher risk of CSM (P = .003), while an age of ≥70 years was independently associated with a higher risk of OCM (P = .005).Age and comorbidity were associated with survival after RP among patients with high-risk PCa, although these associations were not observed among low-risk or intermediate-risk patients. Therefore, older patients with high-risk diseases and greater comorbidity may require alternative multidisciplinary treatment.
Collapse
|
98
|
Cho IA, Lee YJ, Lee HJ, Choi IY, Shin JK, Lee SA, Lee JH, Choi WJ. Angiopoietin-1 and -2 and vascular endothelial growth factor expression in ovarian grafts after cryopreservation using two methods. Clin Exp Reprod Med 2018; 45:143-148. [PMID: 30202745 PMCID: PMC6125148 DOI: 10.5653/cerm.2018.45.3.143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 06/23/2018] [Accepted: 07/05/2018] [Indexed: 12/17/2022] Open
Abstract
Objective The favored method of preserving fertility in young female cancer survivors is cryopreservation and autotransplantation of ovarian tissue. Reducing hypoxia until angiogenesis takes place is essential for the survival of transplanted ovarian tissue. The aim of this study was to investigate the role of angiopoietin-1 (Angpt-1), angiopoietin-2 (Angpt-2), and vascular endothelial growth factor (VEGF) in ovarian tissue grafts that were cryopreserved using two methods. Methods Ovarian tissues harvested from ICR mice were divided into three groups: group I (control), no cryopreservation; group II, vitrification in EFS (ethylene-glycol, ficoll, and sucrose solution)-40; and group III, slow freezing in dimethyl sulfoxide. We extracted mRNA for VEGF, Angpt-1, and Angpt-2 from ovarian tissue 1 week following cryopreservation and again 2 weeks after autotransplantation. We used reverse transcriptase-polymerase chain reaction to quantify the levels of VEGF, Angpt-1, and Angpt-2 in the tissue. Results Angpt-1 and Angpt-2 expression decreased after cryopreservation in groups II and III. After autotransplantation, Angpt-1 and Angpt-2 expression in ovarian tissue showed different trends. Angpt-1 expression in groups II and III was lower than in group I, but Angpt-2 in groups II and III showed no significant difference from group I. The vitrified ovarian tissues had higher expression of VEGF and Angpt-2 than the slowfrozen ovarian tissues, but the difference was not statistically significant. Conclusion Our results indicate that Angpt-2 may play an important role in ovarian tissue transplantation after cryopreservation although further studies are needed to understand its exact function.
Collapse
|
99
|
Sanger A, Kang SB, Jeong MH, Im MJ, Choi IY, Kim CU, Lee H, Kwon YM, Baik JM, Jang HW, Choi KJ. Morphology-Controlled Aluminum-Doped Zinc Oxide Nanofibers for Highly Sensitive NO 2 Sensors with Full Recovery at Room Temperature. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2018; 5:1800816. [PMID: 30250810 PMCID: PMC6145242 DOI: 10.1002/advs.201800816] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Indexed: 05/03/2023]
Abstract
Room-temperature (RT) gas sensitivity of morphology-controlled free-standing hollow aluminum-doped zinc oxide (AZO) nanofibers for NO2 gas sensors is presented. The free-standing hollow nanofibers are fabricated using a polyvinylpyrrolidone fiber template electrospun on a copper electrode frame followed by radio-frequency sputtering of an AZO thin overlayer and heat treatment at 400 °C to burn off the polymer template. The thickness of the AZO layer is controlled by the deposition time. The gas sensor based on the hollow nanofibers demonstrates fully recoverable n-type RT sensing of low concentrations of NO2 (0.5 ppm). A gas sensor fabricated with Al2O3-filled AZO nanofibers exhibits no gas sensitivity below 75 °C. The gas sensitivity of a sensor is determined by the density of molecules above the minimum energy for adsorption, collision frequency of gas molecules with the surface, and available adsorption sites. Based on finite-difference time-domain simulations, the RT sensitivity of hollow nanofiber sensors is ascribed to the ten times higher collision frequency of NO2 molecules confined inside the fiber compared to the outer surface, as well as twice the surface area of hollow nanofibers compared to the filled ones. This approach might lead to the realization of RT sensitive gas sensors with 1D nanostructures.
Collapse
|
100
|
Kim H, Baik SY, Yang SJ, Kim TM, Lee SH, Cho JH, Choi IY, Kim JH, Yoon KH, Kim HS. Clinical experiences and case review of angiotensin II receptor blocker-related angioedema in Korea. Basic Clin Pharmacol Toxicol 2018; 124:115-122. [PMID: 30003686 DOI: 10.1111/bcpt.13097] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 07/10/2018] [Indexed: 12/01/2022]
Abstract
Although angiotensin-converting enzyme inhibitor-related angioedema is well known, angiotensin II receptor blocker (ARB)-related angioedema has not been extensively studied because of its lower incidence. Therefore, ARB-related angioedema is likely to be overlooked in the clinical setting. We analysed the medical records of adults who had been prescribed ARB and diagnosed with angioedema between 2009 and 2015. All adults over the age of 18 years who were initially administered ARB between 1 January 2009 and 31 December 2015 were selected as participants in this study. To confirm whether the angioedema was actually due to the administration of ARB, we conducted a chart review. A total of 35 584 patients were prescribed ARB for the first time when visiting the Seoul St. Mary's Hospital during the study period. Twenty-four patients diagnosed with angioedema for other reasons prior to their first prescription of ARB were excluded from this study. ARB-related angioedema was suspected in six of 35 560 patients (0.02%) who were initially prescribed ARB during the study period. The manifestation of ARB-related angioedema ranged from several days (1/6 case) to several years (3/6 cases). Some patients continued taking ARB with intermittent antihistamine or steroid therapy. In such cases, angioedema symptoms improved but did not completely resolve. Its diagnosis can be delayed and the symptoms may be recurrent as symptoms improve with antihistamine use. In some cases, the same person had different reactions depending on the type of ARB. Definitively diagnosing ARB-related angioedema is difficult, and physicians often overlook angioedema without suspecting that it is an adverse effect of ARB. Close attention of physicians and improved patient education can reduce the incidence of ARB-related angioedema.
Collapse
|