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Sinae Kim,Jong Ho Lee,Siyoung Lee,Saerok Shim,Tam T. Nguyen,Jihyeong Hwang,Heijun Kim,Yeo-Ok Choi,Jaewoo Hong,Suyoung Bae,Hyun Jhung Jhun,Hokee Yum,이영민,Edward D. Chan,Liping Yu,Tania Azam,Yong-Dae Kim 대한면역학회 2020 Immune Network Vol.20 No.5
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) is a positive-sense single-stranded RNA (+ssRNA) that causes coronavirus disease 2019 (COVID-19). The viral genome encodes twelve genes for viral replication and infection. The third open reading frame is the spike (S) gene that encodes for the spike glycoprotein interacting with specific cell surface receptor – angiotensin converting enzyme 2 (ACE2) – on the host cell membrane. Most recent studies identified a single point mutation in S gene. A single point mutation in S gene leading to an amino acid substitution at codon 614 from an aspartic acid 614 into glycine (D614G) resulted in greater infectivity compared to the wild type SARS-CoV2. We were interested in investigating the mutation region of S gene of SARS-CoV2 from Korean COVID-19 patients. New mutation sites were found in the critical receptor binding domain (RBD) of S gene, which is adjacent to the aforementioned D614G mutation residue. This specific sequence data demonstrated the active progression of SARS-CoV2 by mutations in the RBD of S gene. The sequence information of new mutations is critical to the development of recombinant SARS-CoV2 spike antigens, which may be required to improve and advance the strategy against a wide range of possible SARS-CoV2 mutations.
Metabolomics Approach in the Study of the Well-Defined Polyherbal Preparation Zyflamend
Eric D. Tague,Allen K. Bourdon,Amber MacDonald,Maggie S. Lookadoo,Edward D. Kim,Wesley M. White,Paul D. Terry,Shawn R. Campagna,Brynn H. Voy,Jay Whelan 한국식품영양과학회 2018 Journal of medicinal food Vol.21 No.3
Zyflamend is a highly controlled blend of 10 herbal extracts that synergistically impact multiple cell signaling pathways with anticancer and anti-inflammatory properties. More recently, its effects were shown to also modify cellular energetics, for example, activation of fatty acid oxidation and inhibition of lipogenesis. However, its general metabolic effects in vivo have yet to be explored. The objective of this study was to characterize the tissue specific metabolomes in response to supplementation of Zyflamend in mice, with a comparison of equivalent metabolomics data generated in plasma from humans supplemented with Zyflamend. Because Zyflamend has been shown to activate AMPK, the “energy sensor” of the cell, in vitro, the effects of Zyflamend on adiposity were also tested in the murine model. C57BL/6 mice were fed diets that mimicked the macro- and micronutrient composition of the U.S. diet with and without Zyflamend supplementation at human equivalent doses. Untargeted metabolomics was performed in liver, skeletal muscle, adipose, and plasma from mice consuming Zyflamend and in plasma from humans supplemented with Zyflamend at an equivalent dose. Adiposity in mice was significantly reduced in the Zyflamend-treated animals (compared with controls) without affecting body weight or weight gain. Based on KEGG pathway enrichment, purine and pyrimidine metabolism (potential regulators of AMPK) were particularly responsive to Zyflamend across all tissues, but only in mice. Consistent with the metabolomics data, Zyflamend activated AMPK and inhibited acetyl CoA-carboxylase in adipose tissue, key regulators of lipogenesis. Zyflamend reduces adipose tissue in mice through a mechanism that likely involves the activation of AMPK.
Lee, Siyoung,Choi, Dong-Ki,Kwak, Areum,Kim, Sinae,Nguyen, Tam Thanh,Gil, Gaae,Kim, Eunhye,Yoo, Kwang Ha,Kim, In Ae,Lee, Youngmin,Jhun, Hyunjhung,Chan, Edward D.,Bai, Xiyuan,Kim, Hyunwoo,Kim, Yong-Sung 한국조명·전기설비학회 2017 한국조명·전기설비학회 학술대회논문집 Vol. No.
<P>The induction of interleukin (IL)-32 in bone marrow (BM) inflammation is crucial in graft versus host disease (GvHD) that is a common side effect of allogeneic BM transplantation. Clinical trials on α-1 antitrypsin (AAT) in patients with GvHD are based on the preliminary human and mouse studies on AAT reducing the severity of GvHD. Proteinase 3 (PR3) is an IL-32-binding protein that was isolated from human urine. IL-32 primarily induces inflammatory cytokines in myeloid cells, probably due to PR3 expression on the membrane of the myeloid lineage cells. The inhibitory activity of AAT on serine proteinases may explain the anti-inflammatory effect of AAT on GvHD. However, the anti-inflammatory activity of AAT on BM cells remains unclear. Mouse BM cells were treated with IL-32γ and different inflammatory stimuli to investigate the anti-inflammatory activity of AAT. Recombinant AAT-Fc fusion protein inhibited IL-32γ-induced IL-6 expression in BM cells, but failed to suppress that induced by other stimuli. In addition, the binding of IL-32γ to PR3 was abrogated by AAT-Fc. The data suggest that the specific anti-inflammatory effect of AAT in mouse BM cells is due to the blocking of IL-32 binding to membrane PR3.</P>
Optimum design for the carbon nanotube based micro-focus X-ray tube
Kim, Hyun Suk,Castro, Edward Joseph D.,Lee, Choong Hun Elsevier 2015 Vacuum Vol.111 No.-
<P><B>Abstract</B></P> <P>The current work reports the optimum design conditions of a direct current plasma enhanced chemical vapor deposition grown multi-walled carbon nanotube based micro-focus X-ray tube with dual focusing lens. Extensive simulations were performed in order to determine the configuration that would generate a desirable focal spot size. Several dimensions of the X-ray basic structure and the focusing lens were manipulated using a commercially available simulation package. A manipulation of the factors (i.e. geometric parameter, axial distances, and bias voltages variances) and their effects on the focal spot size were also analyzed. A remarkable reduction in the focal spot size was achieved at the anode target via simulation and high resolution images were obtained in a prototype X-ray generator through standard line pattern test.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A CNT-based micro-focus X-ray tube with dual focusing lens. </LI> <LI> A manipulation of the factors and its effect on the focal spot size analysis. </LI> <LI> A similar result via simulation and experimental for focal spot size. </LI> <LI> A high resolution image using a standard line pattern test. </LI> </UL> </P>
Automated Screen of a Preliminary Lead-Drug for Chitosanase Drug Design
Kim,Youngsoo,Marcotte,Edward,Robertus,Jon D.,Park,Yonghyun 이화여자대학교 환경문제연구소 1997 이화환경연구 Vol.1 No.-
Chitosan is a naturally occurring component of certain bacterial and fungal cell walls. If some groups of medically and agriculturally significant fungi contain chitosan, chitosan metabolism repersents attractive drug targets specific to those fungal systems. Recently, structure-based drug design emerges as a powerful technique in drug screening. The process initially requires three dimensional structure of a target molecule. Because the bacterial Streptomyces lividans N174 chitosanase is only one chitosanase whose X-ray structure has been solved, we begin the process of structure-based drug design with the bacterial enzyme but it should be extended to a fungal one. In order to initiate the process, a preliminary leaddrug was screened by automated computer search from chemical database. The 5-nitro-isatin showed an inhibitory effect by 50% at 1.5mM on the Streptomyces lividans N174 chitosanase.
Design of a Carbon-Nanotube Yarn Field Emitter for Micro-focus X-ray Generation
Hyun Suk Kim,Edward Joseph D. Castro,Choong Hun Lee 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.3
The field-emission (F-E) characteristics of multi-walled carbon-nanotube (MWCNT) yarn and its contribution to X-ray generation have been investigated in the current work. A dry spinning method was used to fabricateMWCNT yarn from superMWCNTs that had been fabricated by using microwave plasma-enhanced chemical vapor deposition (MW-PECVD). The F-E behavior of the MWCNT yarn followed the Fowler-Nordheim model. Compared to a MWCNT, the MWCNT yarn displayed a significant F-E capability in both the diode and the triode X-ray generation structures. The low-voltage F-E of the MWCNT yarn can be attributed to the field-enhancing effect of the yarn due to its shape and to the contribution of the high-aspect-ratio nanotubes that protrude from the sides of the yarn. The effect of filters on the development of X-ray images has also been demonstrated. The amount of exposure of the samples to X-rays was also manipulated. Results of this study indicate that the MWCNT yarn may be a good candidate for use in low-voltage F-E applications for X-ray imaging.