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Jung J, Oh Y, Cha S, Ohe J. An analysis of contributing factors of head and neck space infections of odontogenic origin: A long-term retrospective clinical study (including COVID-19 pandemic period). Med Oral Patol Oral Cir Bucal 2023; 28:e622-e629. [PMID: 37330958 PMCID: PMC10635621 DOI: 10.4317/medoral.26018] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2023] [Accepted: 05/15/2023] [Indexed: 06/20/2023] Open
Abstract
BACKGROUND The purpose of this study is to investigate predisposing factors for the head and neck infections (HNIs), regarding to the demographic data, anatomical spaces, microbiology and antibiotic sensitivity for affected patients. MATERIAL AND METHODS A 13-year of retrospective study evaluating 470 patients with HNIs, treated as inpatient management in the Department of Oral and Maxillofacial Surgery of KyungHee University school of Dentistry, Seoul, Korea, from January 2009 to February 2022. Statistical analysis of demographic, time-related, anatomic, microbiologic, and treatment variables were investigated for each patient. RESULTS The frequency of HNIs was significantly higher in 50's in males, followed by 70's in females. High Severity score (SS) were significantly associated with increased LOH (Length of hospital stay) and LOM (Length of medication), while LOH showed more intensive relationship compared with LOM. The most frequently involved space in abscess was submandibular space, though incidence and severity of HNIs shows declining tendency throughout 13-year research. Streptococcus viridans was the most predominant species isolated from pus culture growth, and a combination of ampicillin and sulbactam was the 1st choice of antibiotics intravenously. According to the comparison analysis between recommended antibiotics from resistance testing result and clinically administered antibiotics, final coincidence rate was estimated about 55%. CONCLUSIONS Due to HNIs being multifactorial, predicting progression and management of HNIs is still a challenge for oral and maxillofacial surgeons. The present study showed several predisposing factors of SHNIs and their correlations, which could contribute to earlier diagnosis and more effective treatment planning for clinicians, thereby leading to the improvement of prognosis for patients, ultimately.
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Affiliation(s)
- J Jung
- Department of Oral and Maxillofacial Surgery 02447 Seoul, Republic of Korea
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2
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Oh Y, Cui Q. Non-equilibrium transport of nanoparticles across the lipid membrane. Nanoscale 2023. [PMID: 37431896 DOI: 10.1039/d3nr00930k] [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] [Subscribe] [Scholar Register] [Indexed: 07/12/2023]
Abstract
Development of effective strategies for the internalization of nanoparticles is essential in many applications, such as drug delivery. Most, if not all, previous studies are based on equilibrium considerations. In this work, inspired by the recent development of a pro-drug delivery strategy based on reversible esterification, we consider a non-equilibrium transport mechanism for nanoparticles of a 6 nm diameter across the lipid membrane. We divide the transport process into insertion and ejection steps, which are studied with coarse-grained models using free energy and reactive Monte Carlo simulations, respectively. The simulations show that the non-equilibrium transport efficiency is relatively insensitive to the fraction of reactive surface ligands once a modest threshold is surpassed, while the distribution pattern of different (hydrophilic, reactive and permanent hydrophobic) ligands on the nanoparticle surface has a notable impact on both the insertion and ejection steps. Our study thus supports a novel avenue for designing nanoparticles that are able to be efficiently internalized and provides a set of relevant guidelines for surface functionalization.
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Affiliation(s)
- Younghoon Oh
- Department of Chemistry, Boston University, 590 Commonwealth Avenue Boston, MA 02215, USA.
| | - Qiang Cui
- Department of Chemistry, Boston University, 590 Commonwealth Avenue Boston, MA 02215, USA.
- Departments of Physics and Biomedical Engineering, Boston University, 590 Commonwealth Avenue Boston, MA 02215, USA
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3
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Bruce N, Wei IA, Leng W, Oh Y, Chiu YC, Roper MG, Bertram R. Coordination of pancreatic islet rhythmic activity by delayed negative feedback. Am J Physiol Endocrinol Metab 2022; 323:E492-E502. [PMID: 36223522 PMCID: PMC9722252 DOI: 10.1152/ajpendo.00123.2022] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 10/04/2022] [Accepted: 10/08/2022] [Indexed: 11/22/2022]
Abstract
Secretion of insulin from the pancreas is pulsatile, driven by intrinsic oscillations within individual islets of Langerhans. The secretions are coordinated among the many islets distributed throughout the pancreas producing a synchronized rhythm in vivo that is essential for maintaining normal glucose levels. One hypothesized mechanism for the coordination of islet activity is negative feedback, whereby sequestration of glucose in response to elevated insulin leads to a reduction in the blood glucose level that is sensed by the islet population. This global signal of glucose then coordinates the individual islets. In this study, we tested how this coordination mechanism is affected by time delays in the negative feedback, using a microfluidic system to monitor Ca2+ levels in a small population of islets and implementing glucose control through a negative feedback system. We found that islet synchronization occurs even with time delays in the feedback of up to 7 min. We also found that a second, slower closed-loop oscillation period is produced during delayed feedback in which islet oscillations are clustered into episodes. The period of this second oscillatory mode increases with the time delay and appears to be a second stable behavior that coexists with the faster synchronized oscillation. The general conclusion is that islet coordination through negative feedback is a viable means of islet coordination that is robust to delays in the timing of the feedback, and could complement other potential coordination mechanisms such as entrainment by pancreatic ganglia.NEW & NOTEWORTHY Insulin secretion from islets of Langerhans is rhythmic, and these rhythms are coordinated to produce oscillatory plasma insulin levels. Using a combination of microfluidics and computational modeling, we demonstrate that coordination can occur through negative feedback of the type provided by the liver, even if that feedback is delayed by several minutes. We also demonstrate that a second, slower, mode of oscillations can occur when feedback is delayed where faster oscillations are grouped into episodes.
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Affiliation(s)
- N. Bruce
- Department of Mathematics, Florida State University, Tallahassee, Florida
| | - I.-A. Wei
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida
| | - W. Leng
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida
| | - Y. Oh
- Department of Mathematics, Florida State University, Tallahassee, Florida
| | - Y.-C. Chiu
- Department of Physics, Florida State University, Tallahassee, Florida
| | - M. G. Roper
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida
| | - R. Bertram
- Department of Mathematics, Florida State University, Tallahassee, Florida
- Programs in Molecular Biophysics and Neuroscience, Florida State University, Tallahassee, Florida
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Oh Y, LeVine K, Reed E, Siff J, Papp J, Wilson L, Piktel J. 264 Did COVID-19 Mitigation Affect the Accessibility and Usage of Emergency Department-Based Programs to Combat Opioid Use Disorder? Ann Emerg Med 2022. [PMCID: PMC9519243 DOI: 10.1016/j.annemergmed.2022.08.291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Reed E, Siff J, LeVine K, Oh Y, Wilson L, Papp J, Piktel J. 192 Using the Electronic Health Record to Identify Patients Presenting to the Emergency Department at Highest Risk for Subsequent Overdose. Ann Emerg Med 2022. [DOI: 10.1016/j.annemergmed.2022.08.216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Papp J, Reed E, Oh Y, LeVine K, Wilson L, Siff J, Piktel J. 298 Evaluation of a Multi-Pronged Emergency Department-Based Approach to Reduce Subsequent Overdoses in a High-Risk Emergency Department Population of Opioid Users. Ann Emerg Med 2022. [DOI: 10.1016/j.annemergmed.2022.08.325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Kim E, Oh Y, Kang S. P10.07.B Differential YAP activity in human glioblastoma tumorspheres. Neuro Oncol 2022. [DOI: 10.1093/neuonc/noac174.172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Background
Although glioblastoma (GBM) is the most common primary brain tumor, the best available treatment options are still associated with poor prognosis. Recently, the Hippo/YAP signaling pathway has been emerged as an important driver of GBM. Nevertheless, extensive studies have not yet been focused on the importance of phosphorylation event in regulating endogenous YAP activity in GBM. Here, we sought to elucidate that the modulation and stabilization of YAP/TAZ in Hippo pathway promotes GBM progression.
Material and Methods
Expression patterns of YAP1, TAZ, CTGF, TEAD4 and LATS1 mRNA were confirmed in human normal and GBM tissue, and patient survival according to YAP1 expression was confirmed in TCGA and Severance cohort. The YAP1 expression patterns in several TSs were classified into SOH and AH according to transcriptome analysis and western blot. For each classified TSs, the characteristics of SOH and AH were comparatively analyzed through immunoprecipitation, nucleus fraction, TEAD4 luciferase assay, and confocal analysis. The effect of YAP1 knockdown/out and overexpression in SOH and AH TSs were measured by WST/ATP analysis, 3D invasion and neurosphere formation, and western blot. In addition, the drug reactivity of SOH and AH TSs was examined by treatment with the YAP1 inhibitors Peptide17 and verteporfin, and the effects of Peptide17, verteporfin and YAP1-shRNA were examined in in-vivo xenograft model.
Results
YAP1 mRNA levels including TAZ, CTGF, TEAD4 and LATS1 were higher in GBM than in normal tissues. Through transcriptome analysis and western blot, TS can be divided into SOH and AH groups according to the expression level of CTGF, but not YAP1 level. In the case of SOH TS, the binding of TEAD4 was strong in immunoprecipitation, the ratio of YAP1 was higher in the nucleus in the nucleus fractionation and confocal analysis, and the luciferase activity of TEAD4 was high in the TEAD4 luciferase assay. On the other hand, in the case of TS of AH, the opposite trend was observed. When YAP1 was knocked down or out, the proliferation, invasion, and stemness of TS tended to be decrease more in SOH TS than in AH TS, and SOH TS showed more sensitive drug response even in Peptide17 and Verteporfin treatment. In the case of YAP1 overexpression, the opposite trend was observed in SOH TS. In the in-vivo xenograft model, injection of Peptide17, verteporfin, and YAP1-shRNA showed a tendency to increase the survival rate of mice.
Conclusion
The association of YAP has been described in several cancers, but there has been no study comparing GBM TS by YAP expression and classifying it at the functional level. Now, for the first time, we show that the characteristics of GBM TS can be predicted according to the expression value of YAP, respectively, and YAP is expected to be applied as an important prognostic factor for GBM treatment in the future.
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Affiliation(s)
- E Kim
- Yonsei University College of Medicine , Seoul , Korea, Republic of
| | - Y Oh
- Yonsei University College of Medicine , Seoul , Korea, Republic of
| | - S Kang
- Yonsei University College of Medicine , Seoul , Korea, Republic of
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Sukhadia B, Tan D, Oh Y, Chae Y. EP08.02-023 Differentiation Syndrome in a Patient with Non-Small-Cell Lung Cancer Harboring IDH2 Mutation Treated with Enasidenib. J Thorac Oncol 2022. [DOI: 10.1016/j.jtho.2022.07.705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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9
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Kim L, Oh Y, Yoon S, Park J, Chae Y. P2.12-04 The Role of Serum Proteomic Signature in Predicting Survival in PD-L1 Low Non-small Cell Lung Cancer Receiving Immune Checkpoint Inhibitor (ICI). J Thorac Oncol 2022. [DOI: 10.1016/j.jtho.2022.07.252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Lewis DK, Oh Y, Mohanam LN, Wierzbicki M, Ing NL, Gu L, Hochbaum A, Wu R, Cui Q, Sharifzadeh S. Electronic Structure of de Novo Peptide ACC-Hex from First Principles. J Phys Chem B 2022; 126:4289-4298. [PMID: 35671500 DOI: 10.1021/acs.jpcb.2c02346] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Proteins are promising components for bioelectronic devices due in part to their biocompatibility, flexibility, and chemical diversity, which enable tuning of material properties. Indeed, an increasingly broad range of conductive protein supramolecular materials have been reported. However, due to their structural and environmental complexity, the electronic structure, and hence conductivity, of protein assemblies is not well-understood. Here we perform an all-atom simulation of the physical and electronic structure of a recently synthesized self-assembled peptide antiparallel coiled-coil hexamer, ACC-Hex. Using classical molecular dynamics and first-principles density functional theory, we examine the interactions of each peptide, containing phenylalanine residues along a hydrophobic core, to form a hexamer structure. We find that while frontier electronic orbitals are composed of phenylalanine, the peptide backbone and remaining residues, including those influenced by solvent, also contribute to the electronic density. Additionally, by studying dimers extracted from the hexamer, we show that structural distortions due to atomic fluctuations significantly impact the electronic structure of the peptide bundle. These results indicate that it is necessary to consider the full atomistic picture when using the electronic structure of supramolecular protein complexes to predict electronic properties.
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Affiliation(s)
- D Kirk Lewis
- Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215, United States
| | - Younghoon Oh
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
| | - Luke Nambi Mohanam
- Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215, United States
| | - Michał Wierzbicki
- Department of Materials Science and Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Nicole L Ing
- Department of Materials Science and Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Lei Gu
- Department of Physics, University of California Irvine, Irvine, California 92697, United States
| | - Allon Hochbaum
- Department of Materials Science and Engineering, University of California Irvine, Irvine, California 92697, United States
- Department of Chemistry, University of California Irvine, Irvine, California 92697, United States
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, California 92697, United States
- Department of Chemical and Biomolecular Engineering, University of California Irvine, Irvine, California 92697, United States
| | - Ruqian Wu
- Department of Physics, University of California Irvine, Irvine, California 92697, United States
| | - Qiang Cui
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
- Division of Materials Science and Engineering, Boston University, Boston, Massachusetts 02215, United States
| | - Sahar Sharifzadeh
- Department of Electrical and Computer Engineering, Boston University, Boston, Massachusetts 02215, United States
- Department of Chemistry, Boston University, Boston, Massachusetts 02215, United States
- Division of Materials Science and Engineering, Boston University, Boston, Massachusetts 02215, United States
- Department of Physics, Boston University, Boston, Massachusetts 02215, United States
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Choi R, Park M, Oh Y, Kim S, Lee S, Lee E. M158 Validation of various equations for calculated serum LDL cholesterol in Korean. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Lee E, Lee S, Oh Y, Choi R. W083 Understanding a patient population of syphilis serology tests in Korea. Clin Chim Acta 2022. [DOI: 10.1016/j.cca.2022.04.821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Chun DJ, Oh Y, Sung BJ. Translation-rotation decoupling of tracers reflects medium-range crystalline order in two-dimensional colloid glasses. Phys Rev E 2021; 104:054615. [PMID: 34942845 DOI: 10.1103/physreve.104.054615] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 11/17/2021] [Indexed: 11/07/2022]
Abstract
The dynamic heterogeneity and the translation-rotation decoupling are the dynamic signatures of glasses and supercooled liquids. Whether and how the dynamic heterogeneity would relate to the local structure of glasses has been a puzzle for decades. In this work we perform molecular dynamics simulations for tracers in both two-dimensional polydisperse colloids (2DPC) and two-dimensional binary colloids (2DBC). In 2DPC glasses, hexatic local structures develop at low enough temperatures and grow quickly along with the dynamic correlation length of the 2DPC, which is well known as the medium-range crystalline order (MRCO). In 2DBC glasses, on the other hand, any explicit local structure has not been reported to grow significantly with the dynamic correlation length at low temperatures. We introduce two different types of tracers into colloidal systems: A diamond tracer that resembles the MRCO of 2DPC glasses and a square tracer that is dissimilar to any local structure of glasses. The translation-rotation decoupling of the diamond tracer in 2DPC glasses is much more significant than that of the square tracer in the same 2DPC glasses. On the other hand, such a tracer shape-dependence of the decoupling is not observed in 2DBC glasses where the local hexatic structure does not develop significantly. We introduce a shape-dependency parameter of the decoupling and find that the shape-dependency parameter grows along with the dynamic correlation length in 2DPC glasses but not in 2DBC glasses. This illustrates that the dynamic heterogeneity and the translation-rotation decoupling of tracers could reveal the local structure that develops in glasses.
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Affiliation(s)
- Dong Jae Chun
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Younghoon Oh
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Bong June Sung
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
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14
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Song ES, Oh Y, Sung BJ. Interdomain exchange and the flip-flop of cholesterol in ternary component lipid membranes and their effects on heterogeneous cholesterol diffusion. Phys Rev E 2021; 104:044402. [PMID: 34781553 DOI: 10.1103/physreve.104.044402] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 09/17/2021] [Indexed: 11/07/2022]
Abstract
Cell membranes are heterogeneous with a variety of lipids, cholesterol, and proteins and are composed of domains of different compositions. Such heterogeneous environments make the transport of cholesterol complicated: cholesterol not only diffuses within a particular domain but also travels between domains. Cholesterol also flip-flops between upper and lower leaflets such that cholesterol may reside both within leaflets and in the central region between two leaflets. How the presence of multiple domains and the interdomain exchange of cholesterol would affect the cholesterol transport, however, remains elusive. In this study, therefore, we perform molecular dynamics simulations up to 100μs for ternary component lipid membranes, which consist of saturated lipids (dipalmitoylphosphatidylcholine, DPPC), unsaturated lipids (dilinoleylphosphatidylcholine, DIPC), and cholesterol. The ternary component membranes in our simulations form two domains readily: DPPC and DIPC domains. We find that the diffusion of cholesterol molecules is much more heterogeneous and non-Gaussian than expected for binary component lipid membranes of lipids and cholesterol. The non-Gaussian parameter of the cholesterol molecules is about four times larger in the ternary component lipid membranes than in the binary component lipid membranes. Such non-Gaussian and heterogeneous transport of cholesterol arises from the interplay among the interdomain kinetics, the different diffusivity of cholesterol in different domains, and the flip-flop of cholesterol. This suggests that in cell membranes that consist of various domains and proteins, the cholesterol transport can be very heterogeneous. We also find that the mechanism of the interdomain exchange differs for different domains: cholesterol tends to exit the DIPC domain along the central region of the membrane for the DIPC-to-DPPC transition, while the cholesterol is likely to exit the DPPC domain within the membrane leaflet for the DPPC-to-DIPC transition. Also, the interdomain exchange kinetics of cholesterol for the DPPC-to-DIPC transition is up to 7.9 times slower than the DIPC-to-DPPC transition.
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Affiliation(s)
- Eun Sub Song
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Younghoon Oh
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Bong June Sung
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
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Tran N, Oh Y, Sutherland M, Cui Q, Hong M. Cholesterol-Mediated Clustering of the HIV Fusion Protein gp41 in Lipid Bilayers. J Mol Biol 2021; 434:167345. [PMID: 34762895 DOI: 10.1016/j.jmb.2021.167345] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 10/26/2021] [Accepted: 10/31/2021] [Indexed: 11/16/2022]
Abstract
The envelope glycoprotein (Env) of the human immunodeficient virus (HIV-1) is known to cluster on the viral membrane surface to attach to target cells and cause membrane fusion for HIV-1 infection. However, the molecular structural mechanisms that drive Env clustering remain opaque. Here, we use solid-state NMR spectroscopy and molecular dynamics (MD) simulations to investigate nanometer-scale clustering of the membrane-proximal external region (MPER) and transmembrane domain (TMD) of gp41, the fusion protein component of Env. Using 19F solid-state NMR experiments of mixed fluorinated peptides, we show that MPER-TMD trimers form clusters with interdigitated MPER helices in cholesterol-containing membranes. Inter-trimer 19F-19F cross peaks, which are indicative of spatial contacts within ∼2 nm, are observed in cholesterol-rich virus-mimetic membranes but are suppressed in cholesterol-free model membranes. Water-peptide and lipid-peptide cross peaks in 2D 1H-19F correlation spectra indicate that the MPER is well embedded in model phosphocholine membranes but is more exposed to the surface of the virus-mimetic membrane. These experimental results are reproduced in coarse-grained and atomistic molecular dynamics simulations, which suggest that the effects of cholesterol on gp41 clustering is likely via indirect modulation of the MPER orientation. Cholesterol binding to the helix-turn-helix region of the MPER-TMD causes a parallel orientation of the MPER with the membrane surface, thus allowing MPERs of neighboring trimers to interact with each other to cause clustering. These solid-state NMR data and molecular dynamics simulations suggest that MPER and cholesterol cooperatively govern the clustering of gp41 trimers during virus-cell membrane fusion.
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Affiliation(s)
- Nhi Tran
- Department of Chemistry, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139, United States
| | - Younghoon Oh
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States
| | - Madeleine Sutherland
- Department of Chemistry, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139, United States
| | - Qiang Cui
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States; Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States; Department of Biomedical Engineering, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, United States.
| | - Mei Hong
- Department of Chemistry, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139, United States. https://twitter.com/MeiHongLab
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Oh Y, Munshi N, Kim K. TRANSCRIPTOMIC HETEROGENEITY OF THE POSTNATAL ATRIOVENTRICULAR CONDUCTION SYSTEM AT A SINGLE-CELL RESOLUTION. Can J Cardiol 2021. [DOI: 10.1016/j.cjca.2021.07.028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Liu W, Oh Y, Yin W, Kim R, Zhou Y, Zhang X, Mo R, Puviindran V, Sriranjan S, van Eede M, Henkelman M, Bruneau B, Hui C, Kim K. THE COMBINATORIAL ROLE OF IROQUOIS HOMEOBOX GENES 3 AND 4 IN THE COMPACTION OF THE VENTRICULAR MYOCARDIUM. Can J Cardiol 2021. [DOI: 10.1016/j.cjca.2021.07.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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Oh Y, Markova A, Noor SJ, Rotemberg V. Standardized clinical photography considerations in patients across skin tones. Br J Dermatol 2021; 186:352-354. [PMID: 34564851 PMCID: PMC9297997 DOI: 10.1111/bjd.20766] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 08/27/2021] [Accepted: 09/24/2021] [Indexed: 12/03/2022]
Affiliation(s)
- Y Oh
- Department of Dermatology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - A Markova
- Department of Dermatology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - S J Noor
- Department of Dermatology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
| | - V Rotemberg
- Department of Dermatology, Memorial Sloan Kettering Cancer Center, New York, NY, USA
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Oh Y, Song ES, Sung BJ. The effects of the lipid type on the spatial arrangement and dynamics of cholesterol in binary component lipid membranes. J Chem Phys 2021; 154:135101. [PMID: 33832232 DOI: 10.1063/5.0043212] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Intermolecular interactions between cholesterol and lipids in cell membranes, which play critical roles in cellular processes such as the formation of nano-domains, depend on the molecular structure of the lipids. The diffusion and the spatial arrangement of cholesterol within the lipid membranes also change with the type of lipids. For example, the flip-flop, an important transport mechanism for cholesterol in the membranes, can be facilitated significantly by the presence of unsaturated lipids. However, how the structure of lipids affects the spatial arrangement and the dynamics of cholesterol remains elusive at a molecular level. In this study, we investigate the effects of lipid-cholesterol interactions on the spatial arrangement and the dynamics of cholesterol. We perform molecular dynamics simulations for the binary component membranes of lipids and cholesterol. We employ seven different kinds of lipids by changing either the degree of a saturation level or the length of lipid tails. We find from our simulations that the rate of cholesterol flip-flop is enhanced as the lipids are either less saturated or shorter, which is consistent with previous studies. Interestingly, when the lipid tails are fully saturated and sufficiently long, the center in between two leaflets becomes metastable for cholesterol to stay at. Because the cholesterol at the membrane center diffuses faster than that within leaflets, regardless of the lipid type, such an emergence of the metastable state (in terms of the cholesterol position) complicates the cholesterol diffusion significantly.
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Affiliation(s)
- Younghoon Oh
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Eun Sub Song
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
| | - Bong June Sung
- Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea
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Oh Y, Hennessey A, Young L, Yates D, Barrett C. OP0274-PARE EVALUATION OF PATIENT SATISFACTION FOR TELEHEALTH (PHONE AND VIDEO) IN RHEUMATOLOGY OUTPATIENTS DURING COVID-19 PANDEMIC. Ann Rheum Dis 2021. [DOI: 10.1136/annrheumdis-2021-eular.2885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background:Telehealth via phone (TPhone) or video conference (TVideo) in rheumatology has been a topic of interest for many years. Its use was rapidly expanded due to the international public health emergency of coronavirus disease-19 (COVID-19) outbreak in 2020. Australian Medicare Benefits Schedule (MBS) swiftly enabled temporary MBS telehealth items on 13 March 2020, currently extended until 31 March 20211. In the early phase of the COVID-19 pandemic, Antony et al. conducted a single-centre public survey to assess patient perception of rheumatology telehealth. Their results showed that 98.4% of patients consider telehealth acceptable during the pandemic2. It is unclear, however, whether this positive perception persists after patients experience a telehealth. In addition, a survey data in 2019 suggested more than half of Australian rheumatologists work in private practice3. Therefore, inclusion of private patients will better represent patient perception of telehealth.Objectives:The aim of this study was to evaluate patient satisfaction with telehealth during the COVID-19 pandemic. This would determine its feasibility to be integrated in future rheumatology outpatient model.Methods:A questionnaire containing 30 questions was sent to rheumatology patients who attended telehealth appointments at a level 2 public hospital and a local private clinic between April and May 2020. The questionnaires aimed to obtain information on baseline demographics (sex, age, public or private patient, employment status, visual or auditory impairment), appointment details (TPhone or TVideo, usual arrangement for face-to-face (F2F) appointment, cost effectiveness) and appointment satisfaction using a 5-point Likert scale. Descriptive statistical analysis was conducted.Results:The questionnaire was sent to 1452 patients, of which 494 patients responded (34%). Female predominance (77.1%) and a higher proportion of TPhone (79.1%) was seen in the respondents. A majority of patients were existing patients known to the services (90.9%). More than 70% of responses indicated overall satisfaction in specialist care via telehealth, and 88.7% perceived this suitable during a pandemic. Of all respondents, 21.7% were prescribed new medication, and the majority of these patients were confident in taking the new medication after the telehealth appointment. Future acceptability for TPhone was significantly lower in private patients compared to public patients (p= 0.01). Subgroup analysis revealed that higher telehealth satisfaction was associated with needing to take time off work to attend face-to-face appointment (p= 0.02), perception of cost effectiveness (p<0.001) and TVideo (p=0.03).Conclusion:This is the first study which included both public and private rheumatology patients to evaluate patient satisfaction for telehealth during the COVID-19 pandemic. Overall high level of satisfaction was seen in telehealth most notably associated with its cost effectiveness. A higher percentage of patients who had TVideo compared to TPhone were receptive to future telehealth via TVideo, supportive of the importance of visual cues. This in turn will have significant administrative and technological burdens to coordinate in comparison to a F2F or TPhone review. This qualitative study provides valuable insight of patient perception of telehealth, which has the potential to compliment the traditional rheumatology outpatient model of care following the pandemic.References:[1]COVID-19 Temporary MBS Telehealth Services 2020 [Available from: http://www.mbsonline.gov.au/internet/mbsonline/publishing.nsf/Content/Factsheet-TempBB.[2]Antony A, Connelly K, De Silva T, Eades L, Tillett W, Ayoub S, et al. Perspectives of Patients With Rheumatic Diseases in the Early Phase of COVID-19. Arthritis Care & Research. 2020;72(9):1189-95.[3]Association AR. Workforce Survey Exective Summary 2019 2019 [Available from: https://rheumatology.org.au/members/documents/WorkforceSurveyExecutiveSummary-websiteMay2019.pdf.Acknowledgements:University of QueenslandNursing staff at Redcliffe Hospital and Administration officers at Redcliffe & Northside RheumatologyDisclosure of Interests:None declared
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Lan X, Basu S, Schwietzke S, Bruhwiler LMP, Dlugokencky EJ, Michel SE, Sherwood OA, Tans PP, Thoning K, Etiope G, Zhuang Q, Liu L, Oh Y, Miller JB, Pétron G, Vaughn BH, Crippa M. Improved Constraints on Global Methane Emissions and Sinks Using δ 13C-CH 4. Global Biogeochem Cycles 2021; 35:e2021GB007000. [PMID: 34219915 PMCID: PMC8244052 DOI: 10.1029/2021gb007000] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/14/2021] [Accepted: 05/03/2021] [Indexed: 06/13/2023]
Abstract
We study the drivers behind the global atmospheric methane (CH4) increase observed after 2006. Candidate emission and sink scenarios are constructed based on proposed hypotheses in the literature. These scenarios are simulated in the TM5 tracer transport model for 1984-2016 to produce three-dimensional fields of CH4 and δ 13C-CH4, which are compared with observations to test the competing hypotheses in the literature in one common model framework. We find that the fossil fuel (FF) CH4 emission trend from the Emissions Database for Global Atmospheric Research 4.3.2 inventory does not agree with observed δ 13C-CH4. Increased FF CH4 emissions are unlikely to be the dominant driver for the post-2006 global CH4 increase despite the possibility for a small FF emission increase. We also find that a significant decrease in the abundance of hydroxyl radicals (OH) cannot explain the post-2006 global CH4 increase since it does not track the observed decrease in global mean δ 13C-CH4. Different CH4 sinks have different fractionation factors for δ 13C-CH4, thus we can investigate the uncertainty introduced by the reaction of CH4 with tropospheric chlorine (Cl), a CH4 sink whose abundance, spatial distribution, and temporal changes remain uncertain. Our results show that including or excluding tropospheric Cl as a 13 Tg/year CH4 sink in our model changes the magnitude of estimated fossil emissions by ∼20%. We also found that by using different wetland emissions based on a static versus a dynamic wetland area map, the partitioning between FF and microbial sources differs by 20 Tg/year, ∼12% of estimated fossil emissions.
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Affiliation(s)
- X. Lan
- Cooperative Institute for Research in Environmental SciencesUniversity of Colorado BoulderBoulderCOUSA
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
| | - S. Basu
- Earth System Science Interdisciplinary CenterUniversity of MarylandCollege ParkMDUSA
- Global Modeling and Assimilation OfficeNational Aeronautics and Space Administration Goddard Space Flight CenterGreenbeltMDUSA
| | - S. Schwietzke
- Cooperative Institute for Research in Environmental SciencesUniversity of Colorado BoulderBoulderCOUSA
- Environmental Defense FundBerlinGermany
| | - L. M. P. Bruhwiler
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
| | - E. J. Dlugokencky
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
| | - S. E. Michel
- Institute of Arctic and Alpine ResearchUniversity of Colorado BoulderBoulderCOUSA
| | - O. A. Sherwood
- Institute of Arctic and Alpine ResearchUniversity of Colorado BoulderBoulderCOUSA
- Department of Earth and Environmental SciencesDalhousie UniversityHalifaxNova ScotiaCanada
| | - P. P. Tans
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
| | - K. Thoning
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
| | - G. Etiope
- Istituto Nazionale di Geofisica e VulcanologiaRomeItaly
- Faculty of Environmental Science and EngineeringBabes Bolyai UniversityCluj-NapocaRomania
| | - Q. Zhuang
- Department of Earth, Atmospheric, and Planetary SciencesPurdue UniversityWest LafayetteINUSA
| | - L. Liu
- Department of Earth, Atmospheric, and Planetary SciencesPurdue UniversityWest LafayetteINUSA
| | - Y. Oh
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
- Department of Earth, Atmospheric, and Planetary SciencesPurdue UniversityWest LafayetteINUSA
| | - J. B. Miller
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
| | - G. Pétron
- Cooperative Institute for Research in Environmental SciencesUniversity of Colorado BoulderBoulderCOUSA
- Global Monitoring LaboratoryNational Oceanic and Atmospheric AdministrationBoulderCOUSA
| | - B. H. Vaughn
- Institute of Arctic and Alpine ResearchUniversity of Colorado BoulderBoulderCOUSA
| | - M. Crippa
- Joint Research CentreEuropean CommissionIspraItaly
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22
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Mehta P, Sellitti J, Weber J, Oh Y, Kose K, Rotemberg V. 460 The role of data augmentation on the performance of automated lesion classification in the presence of imaging artifacts: An evaluation of the 2019 ISIC Challenge. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.02.483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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23
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Abstract
We investigate implicit vocabulary learning by adults who are exposed to a language in their ambient environment. Most New Zealanders do not speak Māori, yet are exposed to it throughout their lifetime. We show that this exposure leads to a large proto-lexicon - implicit knowledge of the existence of words and sub-word units without any associated meaning. Despite not explicitly knowing many Māori words, non-Māori-speaking New Zealanders are able to access this proto-lexicon to distinguish Māori words from Māori-like nonwords. What's more, they are able to generalize over the proto-lexicon to generate sophisticated phonotactic knowledge, which lets them evaluate the well-formedness of Māori-like nonwords just as well as fluent Māori speakers.
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Affiliation(s)
- Y Oh
- New Zealand Institute of Language, Brain and Behaviour, NZILBB, University of Canterbury, Private Bag 4800, Christchurch, 8140, New Zealand.
- Department of French Language and Literature, Ajou University, Suwon, South Korea.
| | - S Todd
- New Zealand Institute of Language, Brain and Behaviour, NZILBB, University of Canterbury, Private Bag 4800, Christchurch, 8140, New Zealand
- Department of Linguistics, University of California, Santa Barbara, USA
| | - C Beckner
- Department of Applied Linguistics, University of Warwick, Coventry, UK
| | - J Hay
- New Zealand Institute of Language, Brain and Behaviour, NZILBB, University of Canterbury, Private Bag 4800, Christchurch, 8140, New Zealand
- Department of Linguistics, University of Canterbury, Christchurch, New Zealand
| | - J King
- New Zealand Institute of Language, Brain and Behaviour, NZILBB, University of Canterbury, Private Bag 4800, Christchurch, 8140, New Zealand
- Aotahi - School of Māori and Indigenous Studies, University of Canterbury, Christchurch, New Zealand
| | - J Needle
- New Zealand Institute of Language, Brain and Behaviour, NZILBB, University of Canterbury, Private Bag 4800, Christchurch, 8140, New Zealand
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Jo KI, Oh Y, Kim TH, Bang J, Yuan G, Satija SK, Sung BJ, Koo J. Position-Dependent Diffusion Dynamics of Entangled Polymer Melts Nanoconfined by Parallel Immiscible Polymer Films. ACS Macro Lett 2020; 9:1483-1488. [PMID: 35653667 PMCID: PMC10483881 DOI: 10.1021/acsmacrolett.0c00608] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The morphological structure and dynamics of confined polymers adjacent to the polymer-polymer interface have a profound effect on determining the overall physical properties of polymer blends. We measured the diffusion dynamics of poly(methyl methacrylate) (PMMA) melts confined between polystyrene (PS) layers using neutron reflectivity. Combinations of various thicknesses of PMMA and deuterated PMMA (dPMMA) allowed us to experimentally reveal the nonmonotonic behavior of polymer mobility near the PS-PMMA interface. From the neutron reflectivity results, we found that the polymers adjacent to the immiscible polymer-polymer interface showed enhanced diffusion dynamics because of the repulsive interaction between PS and PMMA, whereas the polymer at local regions farther from the interface exhibited reduced dynamics. This is probably due to the nonspherical conformation of PMMA and spatial confinement near the PS-PMMA interface.
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Affiliation(s)
- Kyoung-Il Jo
- Neutron Science Center, Korea Atomic Energy Research Institute (KAERI), Daejeon 34057, Korea
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea
| | - Younghoon Oh
- Department of Chemistry and Research Institute for Basic Science, Sogang University, Seoul 04107, Korea
| | - Tae-Ho Kim
- Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Korea
| | - Joona Bang
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea
| | - Guangcui Yuan
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | - Sushil K. Satija
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States
| | - Bong June Sung
- Department of Chemistry and Research Institute for Basic Science, Sogang University, Seoul 04107, Korea
| | - Jaseung Koo
- Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Korea
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25
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Cho H, Lee JC, Park HY, Yang W, Nam HM, Ryu J, Oh Y, Hur M. 1064P Efficacy of a novel anti-CEACAM1 monoclonal antibody and CEACAM1 up-regulation in tumour-infiltrating lymphocytes (TILs) of cancer patients. Ann Oncol 2020. [DOI: 10.1016/j.annonc.2020.08.1184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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26
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Kim M, Oh Y, Lee D, Casey V, Kim J. PCN81 The Role of Different Specialties in the Management of NON-SMALL CELL LUNG Cancer: Insights from a Real-World Study. Value Health Reg Issues 2020. [DOI: 10.1016/j.vhri.2020.07.131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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27
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Kwon B, Mandal T, Elkins MR, Oh Y, Cui Q, Hong M. Cholesterol Interaction with the Trimeric HIV Fusion Protein gp41 in Lipid Bilayers Investigated by Solid-State NMR Spectroscopy and Molecular Dynamics Simulations. J Mol Biol 2020; 432:4705-4721. [PMID: 32592698 PMCID: PMC7781112 DOI: 10.1016/j.jmb.2020.06.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Revised: 06/07/2020] [Accepted: 06/18/2020] [Indexed: 12/13/2022]
Abstract
HIV-1 entry into cells is mediated by the fusion protein gp41. Cholesterol plays an important role in this virus-cell fusion, but molecular structural information about cholesterol-gp41 interaction is so far absent. Here, we present experimental and computational data about cholesterol complexation with gp41 in lipid bilayers. We focus on the C-terminal region of the protein, which comprises a membrane-proximal external region (MPER) and the transmembrane domain (TMD). We measured peptide-cholesterol contacts in virus-mimetic lipid bilayers using solid-state NMR spectroscopy, and augmented these experimental data with all-atom molecular dynamics simulations. 2D 19F NMR spectra show correlation peaks between MPER residues and the cholesterol isooctyl tail, indicating that cholesterol is in molecular contact with the MPER-TMD trimer. 19F-13C distance measurements between the peptide and 13C-labeled cholesterol show that C17 on the D ring and C9 at the intersection of B and C rings are ~7.0 Å from the F673 side-chain 4-19F. At high peptide concentrations in the membrane, the 19F-13C distance data indicate three cholesterol molecules bound near F673 in each trimer. Mutation of a cholesterol recognition amino acid consensus motif did not change these distances, indicating that cholesterol binding does not require this sequence motif. Molecular dynamics simulations further identify two hotspots for cholesterol interactions. Taken together, these experimental data and simulations indicate that the helix-turn-helix conformation of the MPER-TMD is responsible for sequestering cholesterol. We propose that this gp41-cholesterol interaction mediates virus-cell fusion by recruiting gp41 to the boundary of the liquid-disordered and liquid-ordered phases to incur membrane curvature.
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Affiliation(s)
- Byungsu Kwon
- Department of Chemistry, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139, USA
| | - Taraknath Mandal
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Matthew R Elkins
- Department of Chemistry, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139, USA
| | - Younghoon Oh
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Qiang Cui
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA; Department of Physics, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA; Department of Biomedical Engineering, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Mei Hong
- Department of Chemistry, Massachusetts Institute of Technology, 170 Albany Street, Cambridge, MA 02139, USA.
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Abstract
Intracellular protein filaments are ubiquitous for cellular functions, but forming bona fide biomimetic intracellular filaments of small molecules in living cells remains elusive. Here, we report the in situ formation of self-limiting intracellular filaments of a small peptide via enzymatic morphological transition of a phosphorylated and trimethylated heterochiral tetrapeptide. Enzymatic dephosphorylation reduces repulsive intermolecular electrostatic interactions and converts the peptidic nanoparticles into filaments, which exhibit distinct types of cross-β structures with either C7 or C2 symmetries, with the hydrophilic C-terminal residues at the periphery of the helix. Macromolecular crowding promotes the peptide filaments to form bundles, which extend from the plasma membrane to nuclear membrane and hardly interact with endogenous components, including cytoskeletons. Stereochemistry and post-translational modification (PTM) of peptides are critical for generating the intracellular bundles. This work may offer a way to gain lost functions or to provide molecular insights for understanding normal and aberrant intracellular filaments.
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Affiliation(s)
- Zhaoqianqi Feng
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA 02454, USA
- These authors contributed equally
| | - Huaimin Wang
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA 02454, USA
- These authors contributed equally
| | - Fengbin Wang
- Department of Biochemistry and Molecular Genetics, University of Virginia, Box 800733, Charlottesville, VA 22908-0733, USA
| | - Younghoon Oh
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
- Rafik B. Hariri Institute for Computing and Computational Science & Engineering, Boston University, 111 Cummington Mall, Boston, MA 02215, USA
- Department of Chemistry and Research Institute for Basic Science, Sogang University, Seoul 04107, Republic of Korea
| | - Cristina Berciu
- Microscopy Core Facility, McLean Hospital, Belmont, MA 02478, USA
| | - Qiang Cui
- Department of Chemistry, Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USA
| | - Edward H. Egelman
- Department of Biochemistry and Molecular Genetics, University of Virginia, Box 800733, Charlottesville, VA 22908-0733, USA
| | - Bing Xu
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, MA 02454, USA
- Lead Contact
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29
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Jo KI, Oh Y, Sung BJ, Kim TH, Um MS, Choi WJ, Bang J, Yuan G, Satija SK, Koo J. Enhanced Dynamics of Confined Polymers near the Immiscible Polymer-Polymer Interface: Neutron Reflectivity Studies. ACS Macro Lett 2020; 9:210-215. [PMID: 35638684 DOI: 10.1021/acsmacrolett.9b01011] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
For polymer-blend films, local dynamics in confined polymer domains tend to differ from the bulk because of significant contributions from the polymer-polymer interface. Herein, we investigated the diffusion dynamics of entangled polymer thin films confined between different polymers in a direction perpendicular to the surface using neutron reflectivity. We found that a bilayer of poly(methyl methacrylate) (PMMA) and deuterated PMMA (dPMMA) sandwiched between polystyrene (PS) layers exhibited significant increase in mobility near the polymer-polymer interface with decreasing PMMA thickness. This indicates that the contribution of repulsive interactions at the immiscible polymer-polymer interface becomes more significant as the film thickness decreases. We also found that the interfacial roughness between PMMA and PS (28 Å at equilibrium) and soft confinement of PS layers did not significantly affect the change in the diffusion dynamics of the adjacent PMMA. This was evidenced by comparison with the diffusion results of multilayers with a flat interface (8 Å at equilibrium) between PMMA and hard PS by UV cross-linking.
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Affiliation(s)
- Kyoung-Il Jo
- Neutron Science Center, Korea Atomic Energy Research Institute (KAERI), Daejeon 34057, Korea
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea
| | - Younghoon Oh
- Department of Chemistry and Research Institute for Basic Science, Sogang University, Seoul 04107, Korea
| | - Bong June Sung
- Department of Chemistry and Research Institute for Basic Science, Sogang University, Seoul 04107, Korea
| | - Tae-Ho Kim
- Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Korea
| | - Min Seop Um
- Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
| | - Woo Jin Choi
- Chemical Materials Solutions Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea
| | - Joona Bang
- Department of Chemical and Biological Engineering, Korea University, Seoul 02841, Korea
| | - Guangcui Yuan
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Sushil K. Satija
- NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
| | - Jaseung Koo
- Department of Organic Materials Engineering, Chungnam National University, Daejeon 34134, Korea
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Jung J, Kwon T, Oh Y, Lee YR, Sung BJ. Spatial Dependence of Non-Gaussian Diffusion of Nanoparticles in Free-Standing Thin Polymer Films. J Phys Chem B 2019; 123:9250-9259. [PMID: 31589036 DOI: 10.1021/acs.jpcb.9b07236] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The addition of nanoparticles (NPs) to a free-standing polymer film affects the properties of the film such as viscosity and glass transition temperature. Recent experiments, for example, showed that the glass transition temperature of thin polymer films was dependent on how NPs were distributed within the polymer films. However, the spatial arrangement of NPs in free-standing polymer films and its effect on the diffusion of NPs and polymers remain elusive at a molecular level. In this study, we employ generic coarse-grained models for polymers and NPs and perform extensive molecular dynamics simulations to investigate the diffusion of polymers and NPs in free-standing thin polymer films. We find that small NPs are likely to stay at the interfacial region of the polymer film, while large NPs tend to stay at the center of the film. On the other hand, as the interaction between a NP and a monomer becomes more attractive, the NP is more likely to be placed at the film center. The diffusion of monomers slows down slightly as more NPs are added to the film. Interestingly, the NP diffusion is dependent strongly on the spatial arrangement of the NPs: NPs at the interfacial region diffuse faster and undergo more non-Gaussian diffusion than NPs at the film center, which implies that the interfacial region would be more mobile and dynamically heterogeneous than the film center. We also find that the mechanism for non-Gaussian diffusion of NPs at the film center differs from that at the interfacial region and that the NP diffusion would reflect the local viscosity of the polymer films.
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Affiliation(s)
- Jinkwan Jung
- Department of Chemistry , Sogang University , Seoul 04107 , Republic of Korea
| | - Taejin Kwon
- Department of Chemistry , Sogang University , Seoul 04107 , Republic of Korea
| | - Younghoon Oh
- Department of Chemistry , Sogang University , Seoul 04107 , Republic of Korea
| | - Young-Ro Lee
- Department of Chemistry , Sogang University , Seoul 04107 , Republic of Korea
| | - Bong June Sung
- Department of Chemistry , Sogang University , Seoul 04107 , Republic of Korea
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31
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Heo J, Oh Y, Noh O, Chun M, Cho O. PO-0711 Second Primary Cancer in Salivary gland cancer in South Korea: A Nationwide Population-based Study. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)31131-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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32
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Cho O, Oh Y, Chun M, Noh O, Heo J. PV-0042 Radiation related lymphopenia as a predictor of locoregional recurrence in early breast cancer. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30462-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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33
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Heo J, Oh Y, Noh O, Chun M, Kim C, Shin Y. PO-139 Second Primary Cancer in Salivary gland cancer: A Nationwide Population-based Study. Radiother Oncol 2019. [DOI: 10.1016/s0167-8140(19)30305-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Oh Y, Sung BJ. Facilitated and Non-Gaussian Diffusion of Cholesterol in Liquid Ordered Phase Bilayers Depends on the Flip-Flop and Spatial Arrangement of Cholesterol. J Phys Chem Lett 2018; 9:6529-6535. [PMID: 30346769 DOI: 10.1021/acs.jpclett.8b02982] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The diffusion of cholesterol in biological membranes is critical to cellular processes such as the formation of cholesterol-enriched domains. The cholesterol diffusion may be complicated especially when cholesterol flip-flops and/or stays at the membrane center. Understanding the diffusion mechanism of cholesterol at a molecular level should be, therefore, a topic of interest. We perform molecular dynamics simulations up to 100 μs for lipid bilayers with various concentrations of cholesterol. We find that cholesterol diffusion in the liquid ordered phase depends on whether it is within leaflets or at the bilayer center, is non-Gaussian for several microseconds, and is enhanced significantly compared to that of lipids. Cholesterol at the bilayer center diffuses fast, while cholesterol in the hydrocarbon region with upright orientation diffuses relatively slowly. Such position-dependent dynamics of cholesterol leads to facilitated and non-Gaussian diffusion.
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Affiliation(s)
- Younghoon Oh
- Department of Chemistry and Research Institute for Basic Science , Sogang University , Seoul 04107 , Republic of Korea
| | - Bong June Sung
- Department of Chemistry and Research Institute for Basic Science , Sogang University , Seoul 04107 , Republic of Korea
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35
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Lee S, Oh Y, Nam K, Oh B, Roh M, Chung K. Mohs micrographic surgery for dermatofibrosarcoma protuberans: comparison of frozen and paraffin techniques. J Eur Acad Dermatol Venereol 2018; 32:2171-2177. [DOI: 10.1111/jdv.15201] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Accepted: 07/12/2018] [Indexed: 11/28/2022]
Affiliation(s)
- S.H. Lee
- Department of Dermatology; Seoul National University Hospital; Seoul Korea
- Institute of Human Environment Interface Biology; Seoul National University; Seoul Korea
| | - Y. Oh
- Department of Dermatology; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - K.A. Nam
- Department of Dermatology; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - B. Oh
- Department of Dermatology; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - M.R. Roh
- Department of Dermatology; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
| | - K.Y. Chung
- Department of Dermatology; Cutaneous Biology Research Institute; Yonsei University College of Medicine; Seoul Korea
- Brain Korea 21 Project for Medical Science; Seoul Korea
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Lee S, Oh Y, Nam K, Oh B, Roh M, Chung K. 575 Comparative single-institute analysis of slow Mohs micrographic surgery and frozen section Mohs micrographic surgery for dermatofibrosarcoma protuberans. J Invest Dermatol 2018. [DOI: 10.1016/j.jid.2018.03.583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Baskaran R, Lee CJ, Kang SM, Oh Y, Jin SE, Lee DH, Yang SG. Poly(lactic-co-glycolic acid) Microspheres Containing a Recombinant Parathyroid Hormone (1-34) for Sustained Release in a Rat Model. Indian J Pharm Sci 2018. [DOI: 10.4172/pharmaceutical-sciences.1000429] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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Cho O, Oh Y, Chun M, Noh O, Heo J. P1.15-015 Prognostic Implication of the FEV1/FVC Ratio in Limited-Stage Small Cell Lung Cancer. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Oh Y, Schreiter JH, Okada H, Wloka C, Okada S, Yan D, Duan X, Bi E. Hof1 and Chs4 Interact via F-BAR Domain and Sel1-like Repeats to Control Extracellular Matrix Deposition during Cytokinesis. Curr Biol 2017; 27:2878-2886.e5. [PMID: 28918945 PMCID: PMC5658023 DOI: 10.1016/j.cub.2017.08.032] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 07/07/2017] [Accepted: 08/15/2017] [Indexed: 11/24/2022]
Abstract
Localized extracellular matrix (ECM) remodeling is thought to stabilize the cleavage furrow and maintain cell shape during cytokinesis [1-14]. This remodeling is spatiotemporally coordinated with a cytoskeletal structure pertaining to a kingdom of life, for example the FtsZ ring in bacteria [15], the phragmoplast in plants [16], and the actomyosin ring in fungi and animals [17, 18]. Although the cytoskeletal structures have been analyzed extensively, the mechanisms of ECM remodeling remain poorly understood. In the budding yeast Saccharomyces cerevisiae, ECM remodeling refers to sequential formations of the primary and secondary septa that are catalyzed by chitin synthase-II (Chs2) and chitin synthase-III (the catalytic subunit Chs3 and its activator Chs4), respectively [18, 19]. Surprisingly, both Chs2 and Chs3 are delivered to the division site at the onset of cytokinesis [6, 20]. What keeps Chs3 inactive until secondary septum formation remains unknown. Here, we show that Hof1 binds to the Sel1-like repeats (SLRs) of Chs4 via its F-BAR domain and inhibits Chs3-mediated chitin synthesis during cytokinesis. In addition, Hof1 is required for rapid accumulation as well as efficient removal of Chs4 at the division site. This study uncovers a mechanism by which Hof1 controls timely activation of Chs3 during cytokinesis and defines a novel interaction and function for the conserved F-BAR domain and SLR that are otherwise known for their abilities to bind membrane lipids [21, 22] and scaffold protein complex formation [23].
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Affiliation(s)
- Younghoon Oh
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA
| | - Jennifer H Schreiter
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA
| | - Hiroki Okada
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA
| | - Carsten Wloka
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA; Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, 9747 AE Groningen, the Netherlands
| | - Satoshi Okada
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA; Department of Medical Biochemistry, Kyushu University Graduate School of Medical Sciences, Fukuoka 812-8582, Japan
| | - Di Yan
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA; Cleveland Clinic Lerner College of Medicine, Cleveland, OH 44195, USA
| | - Xudong Duan
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA
| | - Erfei Bi
- Department of Cell and Developmental Biology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6058, USA.
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Im H, Oh Y, Cho HW, Kim J, Paeng K, Sung BJ. The spatial arrangement of a single nanoparticle in a thin polymer film and its effect on the nanoparticle diffusion. Soft Matter 2017; 13:5897-5904. [PMID: 28766660 DOI: 10.1039/c7sm01115f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The spatial arrangement of nanoparticles (NPs) within thin polymer films may influence their properties such as the glass transition temperature. Questions regarding what may affect the spatial arrangement of NPs, however, still remain unanswered at a molecular level. In this work, we perform molecular dynamics simulations for a free-standing thin polymer film with a single NP. We find from simulations that depending on the NP size and the inter-particle interaction between the NP and polymers, one may control the spatial arrangement of the NP. When the interaction between the NP and polymers is sufficiently attractive (repulsive), the NP is likely to be placed at the center (at the surface) of the thin film in equilibrium. Interestingly, for a moderate interaction between the NP and polymers, the first-order transition occurs in the spatial arrangement of the NP as one increases the NP size: a small NP prefers the surface of the polymer film whereas a large NP prefers the center. Such a first-order transition is corroborated by calculating the free energy of the NP as a function of the position and can be understood in terms of a sixth-order Landau free energy. More interestingly, the diffusion of the NP also changes drastically due to the first-order transition in the spatial arrangement. The NP diffusion is enhanced drastically (more than expected in bulk polymer melts) as the NP is shifted to the polymer film surface.
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Affiliation(s)
- Hesang Im
- Department of Chemistry and Research Institute for Basic Science, Sogang University, Seoul 04107, Republic of Korea.
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Lim SH, Lee T, Oh Y, Narayanan T, Sung BJ, Choi SM. Hierarchically self-assembled hexagonal honeycomb and kagome superlattices of binary 1D colloids. Nat Commun 2017; 8:360. [PMID: 28842555 PMCID: PMC5572454 DOI: 10.1038/s41467-017-00512-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [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: 01/18/2017] [Accepted: 06/30/2017] [Indexed: 01/10/2023] Open
Abstract
Synthesis of binary nanoparticle superlattices has attracted attention for a broad spectrum of potential applications. However, this has remained challenging for one-dimensional nanoparticle systems. In this study, we investigate the packing behavior of one-dimensional nanoparticles of different diameters into a hexagonally packed cylindrical micellar system and demonstrate that binary one-dimensional nanoparticle superlattices of two different symmetries can be obtained by tuning particle diameter and mixing ratios. The hexagonal arrays of one-dimensional nanoparticles are embedded in the honeycomb lattices (for AB2 type) or kagome lattices (for AB3 type) of micellar cylinders. The maximization of free volume entropy is considered as the main driving force for the formation of superlattices, which is well supported by our theoretical free energy calculations. Our approach provides a route for fabricating binary one-dimensional nanoparticle superlattices and may be applicable for inorganic one-dimensional nanoparticle systems. Binary mixtures of 1D particles are rarely observed to cooperatively self-assemble into binary superlattices, as the particle types separate into phases. Here, the authors design a system that avoids phase separation, obtaining binary superlattices with different symmetries by simply tuning the particle diameter and mixture composition.
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Affiliation(s)
- Sung-Hwan Lim
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Taehoon Lee
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea
| | - Younghoon Oh
- Department of Chemistry and Research Institute for Basic Science, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul, 04107, Republic of Korea
| | - Theyencheri Narayanan
- European Synchrotron Radiation Facility, 71 Avenue des Martyrs, F-38043, Grenoble, France
| | - Bong June Sung
- Department of Chemistry and Research Institute for Basic Science, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul, 04107, Republic of Korea
| | - Sung-Min Choi
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea.
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Affiliation(s)
- Y. Kim
- Kyunghee University, Yongin-si, Korea (the Republic of),
| | - H. Lee
- University of Minnesota, Minnesota, Minnesota,
| | - Y. Oh
- Kyunghee University, Yongin-si, Korea (the Republic of),
| | - E. Kang
- Korea Institute for Health and Social Affairs, Sejong- si, Korea (the Republic of)
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Aw S, Oh Y, Koh G, Vrijhoef H, Harding S, Hildon Z. MAPPING TYPOLOGIES OF SOCIAL PARTICIPATION TO PROGRAMMING FOR ELDERS IN THE CHANGING ASIAN CONTEXTS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.3168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- S. Aw
- Saw Swee Hock School of Public Health, Singapore, Singapore,
| | - Y. Oh
- Hallym University, ChunCheon, Korea (the Republic of),
| | - G.C. Koh
- Saw Swee Hock School of Public Health, Singapore, Singapore,
| | - H.J. Vrijhoef
- Saw Swee Hock School of Public Health, Singapore, Singapore,
| | | | - Z.J. Hildon
- John Hopkins University, Baltimore, Maryland
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Seo J, Roh MR, Oh Y, Nam KA, Chung KY. Palmar melanoma: a tertiary centre experience. J Eur Acad Dermatol Venereol 2017; 31:e493-e496. [PMID: 28502087 DOI: 10.1111/jdv.14338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- J Seo
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - M R Roh
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - Y Oh
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - K A Nam
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
| | - K Y Chung
- Department of Dermatology, Severance Hospital, Cutaneous Biology Research Institute, Yonsei University College of Medicine, Seoul, Korea
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Park H, Bae Y, Park J, Kim M, Oh Y, Chun M, Noh O, Cho O, Lee J. EP-1444: Reliable error detection in radiochromic film dosimetry with optimal density curves and corrections. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31879-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Lee E, Park N, Oh Y, Yoo S, Lee H, Lee J, Kim Y. 728 3D Multi-photon imaging for evaluating the anti-aging efficacy of Paeonia Albiflora extract on UV-irradiated fibroblasts in a collagen matrix. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.02.752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lee HJ, Ha JH, Kim SG, Choi HK, Kim ZH, Han YJ, Kim JI, Oh Y, Fragoso V, Shin K, Hyeon T, Choi HG, Oh KH, Baldwin IT, Park CM. Stem-piped light activates phytochrome B to trigger light responses in Arabidopsis thaliana roots. Sci Signal 2016; 9:ra106. [DOI: 10.1126/scisignal.aaf6530] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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49
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Parker J, Oh Y, Moazami Y, Pierce JG, Loziuk PL, Dean RA, Muddiman DC. Examining ubiquitinated peptide enrichment efficiency through an epitope labeled protein. Anal Biochem 2016; 512:114-119. [PMID: 27562526 DOI: 10.1016/j.ab.2016.08.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2016] [Revised: 07/02/2016] [Accepted: 08/19/2016] [Indexed: 10/21/2022]
Abstract
Ubiquitination is a dynamic process that is responsible for regulation of cellular responses to stimuli in a number of biological systems. Previous efforts to study this post-translational modification have focused on protein enrichment; however, recent research utilizes the presence of the di-glycine (Gly-Gly) remnants following trypsin digestion to immuno-enrich ubiquitinated peptides. Monoclonal antibodies developed to the cleaved ubiquitin modification epitope, (tert-butoxycarbonyl) glycylglycine (Boc-Gly-Gly-NHS)(1), are used to identify the Gly-Gly signature. Here, we have successfully generated the Boc-Gly-Gly-NHS modification and showed that when conjugated to a lysine containing protein, such as lysozyme, it can be applied as a standard protein to examine ubiquitinated peptide enrichment within a complex background.
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Affiliation(s)
- J Parker
- Department of Chemistry, North Carolina State University, Raleigh, NC, United States; W. M. Keck FTMS Laboratory for Human Health Research, North Carolina State University, Raleigh, NC, United States
| | - Y Oh
- Department of Plant Pathology, North Carolina State University, Raleigh, NC, United States; Center for Integrated Fungal Research, North Carolina State University, Raleigh, NC, United States
| | - Y Moazami
- Department of Chemistry, North Carolina State University, Raleigh, NC, United States
| | - J G Pierce
- Department of Chemistry, North Carolina State University, Raleigh, NC, United States
| | - P L Loziuk
- Department of Chemistry, North Carolina State University, Raleigh, NC, United States; W. M. Keck FTMS Laboratory for Human Health Research, North Carolina State University, Raleigh, NC, United States
| | - R A Dean
- Department of Plant Pathology, North Carolina State University, Raleigh, NC, United States; Center for Integrated Fungal Research, North Carolina State University, Raleigh, NC, United States
| | - D C Muddiman
- Department of Chemistry, North Carolina State University, Raleigh, NC, United States; W. M. Keck FTMS Laboratory for Human Health Research, North Carolina State University, Raleigh, NC, United States.
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Hamada K, Uedo N, Hanaoka N, Ishihara R, Oh Y. Gastrointestinal: Endoscopic mucosal resection for diagnosis of infiltrating gastric cancer: A case report. J Gastroenterol Hepatol 2016; 31:1670. [PMID: 27060249 DOI: 10.1111/jgh.13404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Accepted: 03/30/2016] [Indexed: 12/09/2022]
Affiliation(s)
- K Hamada
- Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
| | - N Uedo
- Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
| | - N Hanaoka
- Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
| | - R Ishihara
- Department of Gastrointestinal Oncology, Osaka Medical Center for Cancer and Cardiovascular Diseases, Osaka, Japan
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